Chemistry Midterm
What is the electron arrangement for potassium (Atomic number 19)? a. 2,8,7,2 b. 2,8,9 c. 2,10,7 d. 2,8,8,1 e. 2,8,6,3
d. 2,8,6,3
For the following questions, consider the following equation: 2 MG+O2 -> 2MgO How many grams of magnesium are needed to react with 16g of O2? a. 0.50 g b. 1.0 g c. 12 g c. 24 g e. 48 g
d. 24 g
Which of the following conversion factors if a measured number? a. 12 eggs/dozen b. 10 cm/dm c. 16 oz/lb d. 25 miles/gallon e. 12 in/ft
d. 25 miles/gallon
In the reaction of nitrogen gas, N2, with hydrogen gas, H2, to form ammonia gas, NH3, how many moles of hydrogen are needed to reaction with two moles of nitrogen? N2+3H2 ->2NH3 a. 2 moles b. 4 moles c. 5.710 moles d. 6 moles e. 8 moles
d. 6 moles
What is oxidized and what is reduced in the following reaction? 2Al +3Br2->2AlBr3 a. AlBr3 is reduced and Al is oxidized b. AlBr3 is oxidized and Al is reduced c. AlBr3 is reduced and Br2 is oxidized d. Al is oxidized and Br2 is reduced e. Al is reduced and Br2 is oxidized
d. Al is oxidized and Br2 is reduced
The elements lithium, sodium, and potassium a. are isotopes of each other. b. are in the same period of elements. c. have the same number of neutrons. d. are in the same group. e. have the same mass number.
d. Are in the same group
What is the formula of carbon tetraiodide? a. Cl3 b. C2I4 c. CI d. CI4 e. C4I
d. CI4
The compound CoCl3 is named _____. a. copper trichloride b. Copper (III) chloride c. Cobalt trichloride d. cobalt (III) chloride e. tricobalt chloride
d. Cobalt (III) chloride
The ability of an atom to attract the shared electrons in a covalent bond is its ____. a. polarity b. ionic character c. bonding ability d. electronegativity e. nonpolarity
d. Electronegativity
The primary substances of which all other things are composed are a. electrons b. compounds c. protons d. elements e. molecules
d. Elements
Which of the following is an example of a physical change? a. Burning coal b. Baking a cake c. Digesting a cheeseburger d. Grinding coffee beans e. Converting water to hydrogen and oxygen
d. Grinding coffee beans
Coins in a piggy bank are an example of a(n) a. compound. b. heterogeneous mixture. c. element. d. homogeneous mixture. e. none of the above
d. Heterogenous mixture
The compound MgCl2 is named _____________. a) magnesium chlorine b) magnesium dichloride c) magnesium (II) chloride d) magnesium chloride e) dimagnesium chloride
d. Magnesium chloride
Which of the following elements if a nonmetal? a. iron b. calcium c. sodium d. nitrogen e. silver
d. Nitrogen
Which fo the following is an example of potential energy: a. Burning wood b. A fan blade turning c. Riding an exercise vall d. Water stored in a rteservoir e. Chewing food
d. Water stored ina reservoir
Which of the following elements does not exist as a diatomic molecule? a. hydrogen b. oxygen c. chlorine d. carbon e. nitrogen
d. carbon
The number of significant figures in the measurement of 45.030 mm is _______. a. none b. three c. four d. five e. six
d. five
Which of the following is the smallest unit? a. milligram .b. kilogram c. decigram d. microgram e. gram
d. microgram
How many protons are in an isotope of sodium with a mass number of 25? a. 15 b. 32 c. 14 d. 25 e. 11
e. 11
650J is the same amount of energy as: a. 2720 Calories b. 650 Calories c. 1550 Calories d. 2.72 Calories e. 155 Calories
e. 155 Calories
If the heat of evaporation for water if 540 cal/g, how many kcal are released when 5.00g of steam is converted to liquid at 100 degrees Celsius? a. 540 kcal b. 110 kcal c. 5.0 kcal d. 5.4 kcal e. 2.7 kcal
e. 2.7 kcal
The Group 18 elements _____. a. React vigorously with water. b. melt at high temperatures. c. are good conductors of electricity. d. Are liquids are room temperature. e. Are unreactive and are rarely found in combination with other elements.
e. Are unreactive and are rarely found in combination with other elements
The following reaction is an example of a ____ reaction. C5H8 +7O2 -> 5CO2+4H2O a. Combination b. Single replacement c. Double replacement d. Decomposition e. Combustion
e. Combustion
Identify the metalloid in the following list. a. sulfur b. fluorine c. silver d. copper e. germanium
e. Germanium
An anion always a. has a positive charge. b. contains a group of two or more atoms with a positive charge. c. contains a metal and a nonmetal. d. forms covalent bonds. e. has a negative charge.
e. Has a negative charge
Which of the following elements is a metal? a. Fluorine b. nitrogen c. argon d. phosphorus e. strontium
e. Strontium
When a solid is converted directly to a gas, the change of state is called A. Melting b. Freezing c. Boiling d. Condensation E. Sublimation
e. Sublimation
The _____ is the minimum energy needed for a chemical reaction to begin. a. energy of products b. energy of reactants c. heat of reaction d. reaction energy e. activation energy
e. activation energy
In a ______ reaction, two or more elements or compounds form one product. a. single replacement b. double replacement c. decomposition d. combustion e. combination
e. combination
The atomic mass of an element is equal to _____. a. its mass number b. one-twelfth of the mass of a carbon-12 atom c. its atomic number d. the mass of the heaviest isotope e. the mass of an 'average atom'
e. the mass of an 'average atom'
What is the molar mass of copper to sulfate, CUS 04? A 159.6 g/ mole B 63.60 g/ mole C 111.6 g/ mole D 16.00 g/ mole E 319.2 g/ mole
A. 159.6 g/ mole
Consider a neutral atom with 30 protons and 34 neutrons. The atomic number of the element is a. 30. b. 32. c. 34. d. 64. e. 94.
A. 30
The measurement 0.000 043 m, expressed correctly using scientific notation, is ________. a. 4.3 x 10^-6 m b. 4.3 m c. 0.43 x 10^-5m d. 4.3 x 10^-7m e. 4.3 x 10^-6m
A. 4.3 x 10^-6m
Calculate the molar mass of potassium chloride, KCl. A. 74.55 g/mole B. 67.55 g/mole C. 54.55 g/mole D. 19.00 g/mole E. 6.745 g/mole
A. 74.55 g/mole
The name of Al2(SO4)3 is A) aluminum sulfate. B) dialuminum trisulfate. C) dialuminum sulfate. D) dialuminum trisulfide.
A. Aluminum sulfate
In a molecule with covalent bonding, _____. a. Atoms are held together by sharing electrons. b. Oppositely charged ions are held together by strong electrical attractions. c. Atoms of metals form bonds to atoms of nonmetals. d. Atoms of different metals form bonds. e. Atoms of noble gases are held together by attractions between oppositely charged ions.
A. Atoms are held together by sharing electrons.
What elements are in hydroxyapatite, Ca5(PO4)3)H, a major cvompound in human bones and teeth? a. calcium, phosphorous, oxygen, and hydrogen b. Calcium, potassium, oxygen, and helium c. Ccarbon, potassium, oxygen, and hydrogen d. carbon, potassium, oxygen, and helium e. carbon, phosphorus, oxygen, and helium
A. Calcium, phosphorus, oxygen, and hydrogen
The formation of a gas resulting from the escape of high-energy particles from the surface of a liquid is known as a. evaporation. b. deposition. c. boiling. d. melting. e. sublimation.
A. Evaporation
The correct name of the compound NCl3 is ___. a. nitrogen trichloride b. nitrogen (III) chloride c. nickel chloride d. trinitrogen chloride e. nitrogen chloride
A. nitrogen trichloride
A group of covalently bonded atoms that acts together as one charged atom is a ____. a. polyatomic ion b. cation c. anion d. ionic compound e. molecule
A. polyatomic ion
What is the molar mass of Mg3(P04)2, a substance formally used in medicine as an antacid? A 214.3 g/mole B 262.9 g/mole C 71.28 g/mole D 150.3 g/mole E 118.3 g/mole
B 262.9 g/mole
What is the correct answer for the calculation of a volume (in mL) with measured numbers 28.58/16 x 8.02? a. 57 mL b. 0.22 mL c. 14.3 mL d. 0.223 mL e. 14 mL
B. 0.22 mL
If the heat of fusion for water is 80. cal/g, how many calories are needed to melt 45.0 g of ice at 0 °C? a. 3.6 cal b. 3.6 x 103 cal c. 1.8 cal d. 80. cal e. 0.56 cal
B. 3.6x 10^3 cal
0.400 mole of sucrose, C 12 H22011, contains blank moles of C. A 6.02×10 to the 23rd B 4.8 0 C 12 D2.89×10 to the 24th E 5.02×10 to the 22nd
B. 4.8
Select the correct symbol for the element aluminum. a. Sn b Al c. Ag d. Am e. Au
B. Al
The correct formula for a compound formed from the elements Al and O is ___. a. AlO b. Al2O3 c. Al2P d. AlO3 e. Al3O2
B. Al2O3
Ca is the symbol for ____. a. Copper b. Calcium c. Cadmium d. Carbon e. Cobalt
B. Calcium
The phrase "ability to do work" is a definition of _________. a. specific heat b. energy c. calorie d. heating e. cooling
B. Energy
What is the symbol for the ion with 19 protons and 18 electrons? a. F+ b. K+ c. Ar+ d. F- E. K-
B. K+
Which of the following is the largest unit? a. Meter b. Kilometer c. Decimeter D. Micrometer E. Millimeter
B. Kilometer
Which of the following elements is a metalloid? a. gold b. silicon c. nitrogen d. iron e. lithium
B. Silicon
The physical state/s present when a substance is melting is/are: a. liquid b. solid+liquid c. liquid+gas d,. solid e. gas
B. Solid+liquid
In which of the following would the particles move most rapidly: a. Ice at negative 20 degrees Celsius b. Steam at 110 Celsius c. Water at 20 degrees Celsius d. Coiling water e. Ice at zero Celsius
B. Steam at 110 Celsius
A sample of chlorine has two naturally-occurring isotopes. The isotope Cl-35 makes up 75.8% of the sample, and the isotope Cl-37 makes up 24.3% of the sample. Which of the following statements is true? a. The atomic mass of chlorine will be less than 35. b. The atomic mass will be between 35 and 37. c. The atomic mass of chlorine will be more than 37. d. The atomic mass will be 24.3 e. You cannot tell what the atomic mass will be.
B. The atomic mass will be between 35 and 37.
In ionic compounds, ____ lose their valence electrons to form positively charged ____. a. metals, anions b. metals, cations c. metals, polyatomic ions d. nonmetals, anions e. nonmetals, cations
B. metals, cations
A(n) _____ is the smallest neutral unit of two of more atoms held together by a covalent bond. a. nucleus b molecule c. ionic compound d. formula e. unit
B. molecule
Which of the following gives the balanced equation for this reaction? K3PO4+Ca(NO3)2->Ca3(PO4)2+KNO3
C 2K3PO4+3Ca(NO3)2->Ca3(PO4)2+6KNO3
Which of the following is a measurement of mass in the metric system? a. centimeter b. meter c. kilogram d. Celsius e. mililiter
C kilogram
Which of the following contains the designated correct number of significant figures? a. 0.00302 2 S.F. b. 0.04300 5 S.F. c. 156000 3 S.F. d. 3.0650 4 S.F. e. 1.04 2 S.F.
C. 156000 3 S.F.
12 is what percent of 36? a. 3% b. 30% c. 33% d. 330% e. 12%
C. 33%
The molar mass of potassium is blank. A 15.02G/mole B6.02×10 to the 23rd G/mole C 39.1 0G/mole D 19.00G/mole E 31.00G/mole
C. 39.10 g/mole
One mole of copper II sulfate, CuSO4, contains ___ moles of O. A 1.51×10 to the 23rd B 2.41×10 to the 24th C. 4 D2.41×10 to the 23rd E 6.02×10 to the 23rd
C. 4
Which of the following is a chemical change: a. Cutting rope b. melting gold c. Burning sugar d. Bending a steel rod e. Making a snowman
C. Burning sugar
Select the correct symbol for the element potassium. a. Po b. Ko c. K d. Pt e. P
C. K
Which of the following properties is not a characteristic of the Group 1 elements (Alkali metals)? a. They are goods conductors of heat b. They react vigorously with water c. Most of them are liquid at room temperature d. They are shiny e. They are good conductors of electricity
C. Most of them are liquid at room temperature
An example of kinetic energy is which of the following? a. A tree b. Food c. Running water d. A coiled spring E. Natural gas
C. Running water
Which of the following is a characteristic of the modern periodic table? a. A group is a horizontal row on the periodic table b. The A groups contain the transition elements c. The elements in each group have similar chemical properties d. The B groups contain the representative elements e. A period is a column on the periodic table
C. The elements in each group have similar chemical properties
The electron arrangement of any particular atom shows a. the number of isotopes possible. b. a description of the shape of each electron energy level. c. the number of electrons in each energy level. d. a diagram of an atomic nucleus. e. the maximum number of electrons each energy level can hold.
C. The number of electrons in each energy level.
A burn from steam at 100 °C is expected to be more severe than a burn from boiling water at 100°C because a. the steam is hotter than the boiling water. b. there is more steam than water. c. the steam will give off a large amount of heat as it condenses. d. you are more likely to come into contact with the steam than with the boiling water. e. All of these answers are correct.
C. The steam will give off a large amount of steam as it condenses
A value of 345 mm is a measure of _______ a. density b. mass c. length d. volume e. temperature
C. length
How many moles of water, H2O, are present in 75.0 G H2O? A 7.50 moles B 1.35 x 10^3 moles C 4.41 moles D 4.16 moles E 75.0 moles
D 4.16 moles
The specific heat of a substance is the amount of heat needed to a. Convert 1g of liquid to a gas b. Change 1g of the substance from a solid to the liquid state c. Convert 1g of a solid to a gas d. Raise the temperature of 1g of the substance by 1 degree C e. Change 1 g of the substance from the liquid to the solid state
D.
Which of the following measurements has three significant figures? a. 5100 m b. 510 m c. 0.005 m d. 0.510 m e. 0.051 m
D. 0.510 m
How many calories are required to raise the temperature of a 35.0 g sample of iron from 25 to 35 degrees Celsius?Iron has a specific heat of 0.108 cal/g Celsius. a. 93 calories b. 1.1 calories c. 130 calories d. 38 calories e. 3.8 calories
D. 38 calories
Consider a neutral atom with 30 protons and 34 neutrons. The mass number for the atom is ____. a. 30 b. 32 c. 34 d. 64 e. 94
D. 64
On a heating curve a plateau corresponds to a. a change in temperature of a liquid. b. a change in temperature of a solid. c. a change in temperature of a gas. d. a change of state. e. the solid being broken into smaller pieces.
D. A change of state
Which of the following is the correct electron-dot symbol for carbon?
D. C with two dots on all four sides
What is the correct formula for iron (III) sulfide? a. FeS b. Fe2S2 c. Fe2S d. Fe2S3 e. FeS2
D. Fe2S3
An ionic compound _____. a. has a net negative charge. b. contains only cations c. contains only anions d. has a net charge of zero e. has a net positive charge
D. Has a net charge of zero
The energy associated with the motion of particles in a substance is called: A. Chemical energy B. Potential energy C. Temterature D. Heat E. Electrical energy
D. Heat
Which of the following is a physical change: a. Food digests b. Iron rusts c. natural gas burns d. ice melts e. sugar caramelizes
D. Ice melts
To form an ion, a sodium atom a. gains one electron. b. gains two electrons. c. loses seven electrons. d. loses one electron. e. loses two electrons.
D. Loses one electron
Select the correct symbol for the element sodium. a. So b. Au c. Sm d. Na e. No
D. Na
Which of the following is a property of a solid: a. IT fills the volume of the container b. The interactions between it's particles are v weak c. IT takes the shape of the container d. PArticles have fixed psotions and are v close together e. Particles move at a rapid rate
D. PArticles have fixed positions and are v close together
The energy stored in a molecule is: a. Specific heat b. Kinetic energy c. Work d. A calorie d. Potential energy
D. Potential energy
Which of the following does not involve a change of state? a. Melting ice b. Sublimation of dry ice c. Freezing water d. Pouring water into a vaccuum insulated bottle e. Vaporization of alcohol
D. Pouring water into a vaccuum insulated bottle
What is the classification for this unbalanced reaction? Fe +HCl ->FeCl3+H2 a. decomposition b. double replacement c. combustion d. single replacement e. combination
D. Single replacement
A heating curve illustrates a. what a substance looks like as it is heated. b. what happens to the particles of a substance as it is heated. c. what happens to the heat applied as the temperature is increased. d. the changes in the temperature and physical state of a substance as it is heated. e. the chemical changes that occur as the substance is heated.
D. The changes in the temperature and physical state of a substance as it is heated
A value of 36 mL is a measure of A) mass B.) length C) temperature D) volume E) density
D. Volume
Isotopes are atoms of the same element that have _____. a. the same atomic numbers but different numbers of protons b. different atomic numbers c. the same atomic mas but different numbers of protons d. the same atomic number but different numbers of neutrons e. the same atomic numbers but different numbers of electrons
D.. The same atomic number but different numbers of neutrons
What is the molar mass of sodium phosphate, Na3P04? A 118.0 G/mole B 354.0 G/mole C 226.1 G/mole D 69.96 g/mole E 163.9 g/mole
E 163.9 g/mole
A chemical equation is balanced when ____. A The sum of the coefficients of the reactants is equal to the sum of the coefficients of the products B the total number of molecules is the same in reactants and products C the charge on each atom is the same in reactants and products D the total number of ions is the same in reactants and products E the number of atoms of each element is the same in reactants and products
E the number of atoms of each element is the same in reactants and products
The correct formula for the compound formed from Mg and S is _____. a. MG2S b. Mg2S2 c. Mg2S3 d. MgS2 e. MgS
E. MgS
What is the formula of a compound that contains Na+ and PO43- ions? a. NaPO4 b. Na3P c. NA3PO3 d. Na2PO3 e. NA3PO4
E. NA3PO4
Raising the temperature of 10.0 grams of water from 10.0 Celsius to 20.0 Celsius requires 100.0 cal of energy, while riaisng the temperature of 10g of aluminum from 10.0 Celsius to 20.0 Celsius requires 22.0 calories of energy. More calories are required to heat thje water because _____. a. Water has a greater potential energy than aluminum. b. 10.0 degrees Celsius is closer to the melting point of water then the melting point of aluminum. c. 10g water occupies a larger volume than 10g of aluminum. d. Water is a liquid and aluminum is a solid at 10.0Celsius e. Water has a larger specific heat than aluminum
E. Water has a larger specific heat.
How many electrons will aluminum gain or lose when it forms an ion? a. lose 2 b. lose 1 c. gain 1 d. gain 5 e. lose 3
E. lose 3
Which one of the following compounds contains an ion with a 3+ charge? a. Na2O b. MgCl2 c. CuCl d. KCl e. FeCl3
FeCl3
Ionization energy is ____. a. The energy needed to remove the least tightly bound electron b. highest for metals in group 1 c. higher for potassium than lithium d. the energy an ion acquires from an electron e. none of the above
The energy needed to remove the least tightly bound electron
How many kilograms are in 30.4 lb? a. 66.9 kg b. 67 lb c. 66.88 lb d. 14 kg e. 13.8 kg
3. 13.8 kg
3.00 moles of NO2 have a mass of A 138 g B 90.0 g C 45.0 g D 30.0 g E 46.0 g
A 138g
How many grams of glucose (C6H12O6) are in 3.55 moles of glucose? A 640 g B 180 g C 426 g D 50.7 g E 103 g
A 640 g
The molar mass of C3 H802 is ___. A 76.09G/mole B 52.01G/mole C 60.09G/mole D69.02G/mole E 29.02G/mole
A 76.09 g/mole
Which element would have physical and chemical properties similar to chlorine? a. Br b. S c. O d. P e. Ar
A. Br
What is the electron arrangement for aluminum? a. 2,8,10 b. 2,8,3 c. 2,8,7 d. 2,8,8 e. 2, 8,5
B. 2, 8, 3
A dose of aspirin of 5.0 mg per kilogram of body weight has been prescribed to reduce the fever of an infant weighing 8.5 pounds. The number of milligrams of aspirin that should be administered is _____. a. 19 mg b. 5.0 mg c. 53 mg d. 0.59 mg e. 1.6 mg
a. 19 mg
A nugget of gold with a mass of 521 g is added to 50.0 mL of water. The water level rises to a volume of 77.0 mL. What is the density of the gold? a. 19.3 g/mL b. 10.4 g/mL c. 1.00 g/mL d. 0.0518 g/mL e. 6.77 g/mL
a. 19.3 g/mL
For the following question, consider the following equation: 2Mg+O2->2MgO The number of moles of oxygen gas needed to react with 4.0 moles of Mg is ___. a. 2.0 moles b. 1.0 mole c. 4.0 moles d. 6.0 moles e. 3. 0 moles
a. 2.0 moles
One cup of kidney beans contains 15 g of protein, 1 g of fat, and 42 g of carbohydrate. How many kilocalories, to two significant figures, does this sample contain? (The caloric values are: 4 kcal/g for carbohydrate, 9 kcal/g for fat, and 4 kcal/g for protein.) a. 240 kcal b. 60 kcal c. 520 kcal d. 90kcal e. 230 kcal
a. 240 kcal
A calculator answer of 423.6059 must be rounded off to three significant figures. What answer is reported? a. 424 b. 423 c. 1.7420 d. 423.7 e. 423.6
a. 424
The temperature of liquid nitrogen is -196 °C. What is the corresponding reading on the Kelvin scale? a. 77 K b. -127 K c. -91 K d. 48 K e. 146 K
a. 77K
A potato contains 20 g of carbohydrate. If carbohydrate has a caloric value of 4 kcal/g, how many kcal are obtained from the carbohydrate in the potato? a. 80 kcal b. 20 kcal c. 60 kcal d. 5 kcal e. 40 kcal
a. 80 kcal
Which of the following polyatomic ions has a positive charge? a. ammonium b. hydroxide c. nitrate d. cyanide e. hydrogen carbonate
a. ammonium
the smallest particle of an element that retains the properties of that element is a(n) _____. a. atom b. electron c. nucleus d. neutron e. proton
a. atom
The following reaction takes place when an electric current is passed through water. It is an example of a ____ reaction. 2H2O---electricity---> 2H2 +O2 a. decomposition b. combination c. combustion d. double replacement e. single replacement
a. decomposition
In an oxidation-reduction reaction, the substance oxidized always ______. a. loses electrons. b. takes on oxygen atoms. c. becomes a charged species. d. gains electrons. e. gives up hydrogen atoms.
a. loses electrons
In which of the following is the metric unit paired with its correct abbreviation? A. milliliter/mL b. centimeter/km c. kilogram/cg d. microgram/mg e. gram/gm
a. milliliter/ml
In a covalently bonded molecule, the number of electrons that an atom shares with other is usually equal to the number of electrons ___. a. needed to give it a noble gas arrangement. b. in it nucleus. c. in all the atoms d. in its ion e. in the atom
a. needed to give it a noble gas arrangement.
Double and triple bonds form because ____. a. single covalent bonds do not give all the atoms in the molecule eight valence electrons. b. one of the atoms in the molecule has more than 8 valence electrons c. there is at least one hydrogen atom involved in the bond d. the ions involved have charges larger than one e. the atoms involved have high electronegativities
a. single covalent bonds do not give all the atoms in the molecule eight valence electrons.
5.21 cm is the same length as ______. a. 5.21 mm b. 52.1 dm c. 50210 m d. 0.00521 km e. 0.0521 m
E. 0.0521 m
When 2610 + 11.7 + 0.22 are added, the answer to the correct number of decimal places is ____. a. 2621.9 b. 2621 c. 2600 d. 2621.92 e. 2620
E. 2620
Select the correct symbol for the element iron. a. In b. FE c. Fs d. Ir e. Fe
E. Fe
Which of the following would not be a physical change: a. burning gasoline in a lawnmower b. melting gold to make jewelry c. tearing aluminum foil d. freezing water to make ice cubes e. boiling water
a. Burning gasoline in a lawnmower
Pb is the symbol for ____ a. lead b. plumbium c. mercury d. silver e. potassium
a. Lead
Which one of the following properties describes a liquid: a. particles are close together and move randomly b. particles move very rapidly c. fills the entire volume of the container d. has it's own shape e. there's essentially no interaction between the particles
a. Particles are close together and move randomly
Which of the following is a physical change: a. Solid dry ice changing to a gas b. A tomato ripening c. Digesting a meal d. Fermenting grapes to produce wine e. Baking a cake
a. Solid dry ice changing to a gas
For the following questions, consider the following equation: 2 MG+O2 -> 2MgO How many grams of MgO are produced when 40.0 grams of O2 react completely with Mg? a. 50.4 g b. 101 g c. 40.3 g d. 60.5 g e. 202 g
b. 101 g
In this reaction, what is the correct coefficient for sodium chloride? Pb(NO3)2 + NaCl -> PbCl2 + ? NaNO3 a. 1 b. 2 c. 3 d. 4 e. 5
b. 2
675 Calories is the same amount of energy as: a. 0.161 J b. 2820 J c. 420J d. 2.82 J e. 161 J
b. 2820J
Write 540 000 in scientific notation. a. 5.4 x 10^-5 b. 5.4 x 10^5 c. 54 x 10^8 d. 0.54 x 10^6 e. 5.4
b. 5.4 x 10^5
What coefficient is placed in front of O2 to complete the balancing of the following equation? C5H8 + ? O2 → 5CO2 + 4H2O a. 5 b. 7 c. 9 d. 1 e. 3
b. 7
Which of the following descriptions of a subatomic particle is correct? a. A proton has a positive charge and a negligible mass b. A proton has a positive charge and a mass of approximately 1 amu c. A neutron has a positive charge and a mass of approximately 1 amu d. An electron has a negative charge and a mass of approximately 1 amu e. A neutron has no charge and its mass is negligible
b. A proton has a positive charge and a mass of approximately 1 amu
The elements sodium, magnesium, and silicon _____. a. are isotopes of each other b. are in the same period of elements c. are in the same group d. have the same mass number e. have the same number of neutrons
b. Are in the same period of elements
According to the atomic theory, a. all atoms are different. b. atoms are neither created nor destroyed during a chemical reaction. c. atoms of the same element combine to form compounds. d. all matter is made up of tiny particles called electrons. e. a compound can contain different numbers of atoms as long as it has the same kinds of atoms.
b. Atoms are neither created nor destroyed during a chemical reaction
Which one of the following substances will float in gasoline, which has a density of 0.74 g/mL? The density of each substance is shown in parentheses. a. mercury (D=13.6 g/mL) b. balsa wood (D=0.16 g/mL) c. aluminum (D=2.70 g/mL) d. table salt (D=2.16 g/mL) e. sugar (D=1.59 g/mL)
b. Balsa wood (D=0.16 g/mL)
The correct name for the compound N2O3 is ___. a. dinitride trioxide b. dinitrogen trioxide c. nitrogen trioxide d. nitrogen oxide e. dinitrogen oxide
b. Dinitrogen trioxide
Valence electrons are electrons located____. a. in the first three shells of an atom b. in the outermost energy level of an atom c. thoughout the atom d. in the innermost level of the atom e. in the nucleus of the atom
b. In the outermost energy level of an atom
Which of the following is a characteristic of nonmetals? a. good conductors of heat b. low melting points c. Good conductors of electricity d. malleable e. shiny
b. Low melting points
What is the correct formula for the oxide ion? a. O3+ b. O2- c. O+ d. O e. O2+
b. O2-
The atomic number of an atom is ____. a. neutrons plus protons b. protons c. neutrons d. nuclei e. electrons plus protons
b. Protons
A value of 25 °C is a measurement of _______ a. volume b. temperature c. length d. density e. mass
b. Temperature
In a gas, the distance between the particles is: a. very close relative to the size of the molecules b. very large relative to the size of the molecules c. fixed relative to the size of the molecules d. small relative to the size of the molecules e. close relative to the size of the molecules
b. Very large relative to the size of the molecules
In an atom, the nucleus contains ____. a. only neutrons b. all the protons and neutrons c. only protons d. an equal number of protons and neutrons e. all the protons and electrons
b. all the protons and neutrons
Helium is a(n) ____ a. heterogenous mixture b. element c. electron d. homogenous mixture e. compound
b. element
A reaction that releases energy as it occurs is classified as a(n) a. oxidation-reduction reaction b. exothermic reaction c. decomposition reaction d. endothermic reaction e. catalyzed reaction
b. exothermic reaction
The _____ is the energy different between reactants and products in a chemical reaction. a. overall energy b. heat of reaction c. transition energy d. product energy e. activation energy
b. heat of reaction
The cubic centimeter (cm^3 or cc) has the same volume as a _____. a. cubic liter b. milliliter c. cubic decimeter d. centimeter e. cubic inch
b. milliliter
Which of the following is an element? a. water b. tin c. iced tea d. salt e. sugar
b. tin
A liquid has a volume of 34/6 mL and a mass of 46.0 g. What is the density of the liquid? a. 1.00 g/mL b. 0.752 g/mL c. 1.33 g/mL d. 0.663 g/mL e. 1330 g/mL
c. 1.33 g/mL
Elements in group 2 of the periodic table form ions with a charge of ____. a. 3+ b. 1+ c. 2+ d. 1- e. 0
c. 2+
A doctor's order is 0.125 g of ampicillin. The liquid suspension on hand contains 250 mg/5.0 mL. How many milliliters of the suspension are required? a. 0.0025 mL b. 3.0 mL c. 2.5 mL d. 6.3 mL e. 0.0063 mL
c. 2.5 mL
The number of electron energy levels in a magnesium atom is _____. a. 1 b. 2 c. 3 d. 4 e. 5
c. 3
What is the mass number of an atom of potassium that has 20 neutrons? a. 15 b. 19 c. 39 d. 59 e. 35
c. 39
Which of the following gives the correct numbers of protons, neutrons, and electrons in a neutral atom in 118/50 Sn? a. 118 protons, 118 neutrons, 50 electrons b. 118 protons, 50 neutrons, 118 electrons c. 50 protons, 68 neutrons, 50 electrons d. 68 protons, 68 neutrons, 50 electrons e. 50 protons, 50 neutrons, 50 electrons
c. 50 protons, 68 neutrons, 50 electrons
What is the symbol of the element in Group 14 and Period 2? a. Be b. Si c. C d. Mg e. Ca
c. C
What is the correct formula for iron (II) ion? a. Fe2- b. Fe+ c. Fe2+ d Fe3+ e. Fe3-
c. Fe2+
If the reaction shown below is exothermic, the energy level of the reactants is ________. H2 + O2 → 2H2O a. higher than the activation energy of the reaction b. lower than that of the products c. higher than that of the products d. the same as that of the products e. possibly lower, possibly higher than that of the products
c. Higher than that of the products
Which of the following is not a characteristic of the solid state? a. Particles are close together b. Has a definitive shape c. Particles are moving very fast d. Particles are in fixed positions e. Has a definite volume
c. Particles are moving very fast
The number of neutrons in an atom is equal to ____. a. The mass number b. The mass number-the atomic number c. the number of protons d. the atomic number e. the mass number+the atomic number
c. The number of protons
The amount of space occupied by a substance is its ___________ a. length b. density c. volume d. mass e. weight
c. Volume
What type of reaction is: CH4+2O2->CO2+2H2O+218kcal? a a single replacement reaction b. a decomposition reaction c. an exothermic reaction d. an endothermic reaction e. a combination reaction
c. an exothermic reaction
Which of the following is a homogenous mixture? a. tea b. noodle soup c. sugar d. carbon e. water
c. sugar
Which of the following is not an element? a. tin b. silver c. water d. carbon e. gold
c. water
The measurement of the gravitational pull on an object is its ________ A. mass b. length c. weight d. size e. volume
c. weight
In this reaction, what is the substance oxidized? Zn+2HCl ->ZnCl2 +H2 a. chlorine b. oxygen c. zinc d. hydrpgem e. zinc chloride
c. zinc
For the following question, consider the following equation: 2Mg+O2->2MgO The numbes of moles of MgO produced when 0.20 mole of O2 reacts completely is ____. a. 0.8 mole b. 0.10 mole c. 0.60 mole d. 0.40 mole e. 0.20 mole
d. 0.40 mole
A dietary Calorie is equal to ______. a. 100 calories b. 1000 kcals c. 1 calorie d. 1000 calories e. 10 calories
d. 1000 calories
How many centimeters are there in 57.0 in.? a. 140 cm b. 22 cm c. 0.0445 cm d. 145 cm e. 22.4 cm
d. 145 cm
The maximum number of electrons that may occupy the third electron energy level is ______. a. 32 b. 8 c. 10 d. 18 e. 2
d. 18
How many liters of soft drink are there in 5.25 qt? a. 5.57 L b. 4.95 L c. 55.7 L d. 5.0 L .e 4950 L
4.95 L
