Final Test questions

Gas is sold for $1.399 per liter and your car needs 12.00 gallons. How much will your credit card be charged? A) 16.79 B) 4.44 C) 67.15 D) 63.54

1 Gallon = 3.785 L 12.00G x 3.875 L = 45.42 L 45.42 x 1.399 = $63.54

The number of atoms in 2.4g of Mg metal is_________. A) 6.0 x 10^22 B) 3.7 x 10^22 C) 2.5 x 10^22 D) 1.7 x 10^22

1 mol of Mg have Avogadro number(6.022x10^23) of Mg atoms 1 mol of Mg weight 24. gmol-1 2.4 g have (2.4g/24 gmol-1) =0.1 mol of Mg 0.1 mol contains (0.1mol x 6.022x10^23 mol-1)atoms= 6.022x10^22 atoms of Mg

A person is 6ft 10in tall. This is equivalent to ________m. (12 in = 1ft) A) 2.08 m B) 2.69 m C) 3.22 m D) 1.68 m

39.37 in = 1 m 6ft x 12in + 10in =82 82in / 39.37 in = 2.08 m

Calculate the mass in grams of 8.35 x 10^22 molecules of CBr4. A) .0217 g B) .139 g C) 7.21 g D) 12.7 g E) 46.0 g

8.35 x 10^22 / 6.02 x 10^23 = 0.139 mole Molar mass CBr4 = 331.6 g/mol 0.139 x 331.6 = 46.0 g

Two moles of hydrogen react with excess nitrogen to produce __________moles of ammonia. N2+3H2---->2NH3 A) 1.3 B) 2.0 C) 1.0 D) 6.0

A) 1.3

Which of the following atoms has the greatest metallic character? A) Cs B) Be C) Cu D) Ti E) Au

A) Cs

Identify the oxidized species in the following chemical process: Fe+Cu(NO3)2----->Fe(NO3)2+Cu A) Fe B) Cu^+2 C) NO3- D) Cu

A) Fe

Choose a homongeneous mixture from the list below A) Helium B) Ice C) Beef stew D) air

A) Helium

The correct symbol for the ion formed by sodium is: A) Na+ B) S2- C) Na- D) S2+ E) K+

A) Na+

Which of the following statements is an example of a chemical property? A) Oxygen gas is consumed in the burning of wood. B) Ice melts above 0 C C) Lead is denser than Al D) Table salt (sodium chloride) is soluble in water.

A) Oxygen gas is consumed in the burning of wood

What is the correct formula for the compound lead (IV) oxide? A) PbO2 B) PbO4 C) Pb2O D) Pb4O E) Pb

A) PbO2

The compound ClO3 is a dark brown solid powder that is not stable above 25C. Name this molecular compound. A) chlorine trioxide B) chlorine oxide C) chlorate D) chlorite E) chlorine (VI) oxide

A) chlorine trioxide

For an electron in a given atom, the larger n, the A) larger the average distance from the nucleus and the higher the orbital energy B) larger the average distance from the nucleus and the lower the orbital energy C) smaller the average distance from the nucleus and the higher the orbital energy D) smaller the average distance from the nucleus and the lower the orbital energy

A) larger the average distance from the nucleus and the higher the orbital energy

In the_____________state(s), atoms or molecules are packed close to each other in fixed locations. A) solid B) gas C) liquid D) liquid and gas

A) solid

The elements with the highest electronegativity values tend to be found in the: A) upper right-side of the periodic table B) lower right-side of the periodic table C) upper left-side of the periodic table D) lower left-side of the periodic table E) center of the periodic table

A) upper right-side of the periodic table

How many total electrons are in the orbitals of Carbon? A) 12 B) 6 C) 4 D) 2

B) 6

Which of the following molecules has polar bonds but has no net dipole? A) NH3 B) CCl4 C) CHCl3 D) CH4

B) CCl4

If the following ions are Ca^2+, NO3-, Na+, and SO4^2- are placed in a test tube, the precipitate formed is________. Ca^2(g) + NO3- (g)-------->Na+(g) + SO4^2-(g) A) NaNO3 B) CaSO4 C) CaCO3 D) Ca(NO3)2

B) CaSO4

What is the formula for a compound composed of Cr3+ ions and SO3 2-? A) CrSO3 B) Cr2(SO3)3 C) Cr3(SO3)2 D) Cr(SO3)2 E) Cr(SO3)3

B) Cr2(SO3)3

Which is the limiting reactant if 6 mol of H2 and 4 mol of O2 are used? A) O2 B) H2 C) neither H2 nor O2 D) both H2 and O2

B) H2

According to the Bohr model, when a hydrogen electron makes a transition from n=4 to n=2, which of the following statements is true? A) I only B) I and III C) I and IV D) II and IV

B) I and III

Which of the following statements about energy is FALSE!\? A) Energy can be converted from one type to another type B) KE is the energy associated with an object's position C) A car at the top of a hill has a high potential energy The energy in chemical bonds is potential energy

B) KE is the energy associated with an object's position

The correct symbol for the Ion formed by nitrogen is: A) N2_ B) N3_ C) N3+ D) N2+ E) N_

B) N3_

Which following statements applies to noble gases? A) Noble gases exist as diatomic molecules in their elemental form. B) Noble gases are found in Group VIIIA (18) in the periodic table. C) Noble gases are very reactive D) Noble gases were discovered in ancient times E) Many compounds are known for each noble gas.

B) Noble gases are found in Group VIIIA (18) in the periodic table.

Which of the following statements regarding the nucleus of the atom is INCORRECT? A) The nucleus is the central core of the atom. B) The nucleus contains the electrons and the protons. C) The nucleus contains most of the mass of the atom. D) The nucleus contains the neutrons E) The nucleus contains the neutrons and protons and most of the mass of the atom.

B) The nucleus contains the electrons and the protons

All of the following are metric units except? A) meter B) mile C) C D) gram

B) mile

List the number of protons, neutrons, and electrons for 40 Ca 2+: A) 40 protons, 20 neutrons, and 20 electrons B) 40 protons, 20 neutrons, and 18 electrons C) 20 protons, 20 neutrons, and 18 electrons D) 20 protons, 20 neutrons, and 22 electrons E) 60 protons, 20 neutrons, and 18 electrons

C) 20 protons, 20 neutrons, and 18 electrons

Which of the following is coldest temperature? A) -40 C B) -40 F C) 210 K D) All are the same

C) 210K

If 4 moles of nitrogen produces 2 moles of nitrogen dioxide, then the percentage yield is A) 100% B) 50% C) 25% D) 12.5%

C) 25%

Express .00627 in scientific notation A) 6.27 x 10^-2 B) 6.27 x 10^3 C) 6.27 x 10^-3 D) 6.27 x 10^2

C) 6.27 x 10^-3

Round off 907,506 to four significant figures. A) 9.075 x 10^-5 B) 9.075 x 10^5 C) 9,075 D) 90,751

C) 9,075

Which of the following is true? A) Changing the subscripts to balance an equation is acceptable B) The products are listed on the left and the reactants are listed on the right. C) Atoms are conserved when balancing a chemical equation D) Coefficients can be fractions

C) Atoms are conserved when balancing a chemical equation

Which reactant is present in excess if 10.0g of CaO react with 3.0 mol of H2O? CaO+H2O----->Ca(OH)2 A) Ca(OH)2 B) CaO C) H2O D) none of the above, the amounts exactly balance

C) H20

The formula for the ammonium ion is: A) NH3+ B) NH3 C) NH4+ D) NH4 E) NH4_

C) NH4+

Which of the following is a physical change? A) Liquid propane evaporates from a driveway. B) A platinum surface becomes tarnished after exposure to air C) Salt burns when heated on a frying pan. D) A bicycle rusts.

C) Salt burns when heated on a frying pan

The greater the energy of a wave, the A) longer the wavelength and higher the frequency B) longer the wavelength and the lower the frequency C) Shorter the wavelength and the higher the frequency D) shorter the wavelength and the lower the frequency

C) Shorter the wavelength and the higher the frequency

The atomic number of an element represents A) the number of electrons its atom can gain B) the number of neutrons in an atom of the element C) the number of protons in an atom of the element D) the number of protons and neutrons in an atom of the element E) the mass of an atom of the element

C) The number of protons in an atom of the element

What is reduction? A) loss of electrons B) increase in oxidation number C) gain of electrons D) two of the above

C) gain of electrons

In general, which states(s) of matter has/have the largest distances between molecules? A) solids B) gases C) liquids D) both solids and liquids

C) liquids

What is the shape around the central atom when there are three electron groups? A) bent B) tetrahedral C) trigonal planar D) linear

C) trigonal planar

What is the theoretical mass of carbon dioxide produced from 4.0 molecules of NaHCO3? NaHCO3----->Na2CO3+CO2+H2O A) 1.0 g B) 22 g C) 44 g D) 88 g

CO2 C= 12.011 g/mol O= 15.999 g/mol 12.011 + 15.999*2 = 44.009

A sphere has a volume of 230 mm^3. What is it's Volume in cm^3? A) 2.3 x 10^-4 cm^3 B) 2.3 x 10^-3 cm^3 C) 2.3 cm^3 D) 0.23 cm^3

D) 0.23 cm^3

How many grams of oxygen will react with 20 g of ammonia? A) 71 g B) 94 g C) 24 g D) 47 g

D) 47 g

The value of (delta)H for the reaction below is -126Kj. How much heat in (Kj) is released when 2.00 mol of NaOH is formed in the reaction? 2NaO2(s) + 2H2O(l)------>4NaOH(s) + O2(g) A) 252 B) -126 C) 7.8 D) 63

D) 63

Which of the following evidence that a chemical reaction has occurred? A) Formation of a precipitate B) Color change C) Emission of light D) All of the above

D) All of the above

Which of the following can be classified as matter? A) ice B) sugar C) graphite D) All of the above are matter.

D) All of the above matter

Which has the largest atomic radius? A) N B) As C) Sb D) Bi E) P

D) Bi

Which of the following is a pure, elemental substance? A) air B) SO2(g) C) H2O(l) D) Br2(l)

D) Br2

Which of the following is the correct formula for the compound with the name copper (II) sulfate? A) Cu2S B) CuS2 C) Cu2SO4 D) CuSO4 E) CuSo3

D) CuSO4

What do the following have in common? Cl- Ar K+ A) Number of protons B) Number of Neutrons C) They are Isotopes D) Number of electrons E) They are all ions

D) Number of electrons

If the products have a higher energy than the reactants_______. A) the reaction is exothermic B) the reaction is endothermic C) the reactants have less energy than the products D) both B and C

D) both b and c

A reactive element with a relatively high electronegativity would be expected to have a relatively: A) small negative electron affinity and a relatively low ionization energy B) small negative electron affinity and a relatively high ionization energy C) large negative electron affinity and relatively low ionization energy D) large negative electron affinity and a relatively high ionization energy.

D) large negative electron affinity and a relatively high ionization energy.

The electron geometry and the molecular geometry of water are, respectively: A) trigonal planar, bent B) tetrahedral, tetrahedral C) tetrahedral, trigonal pyramidal D) tetrahedral, bent

D) tetrahedral, bent

Determine the density of an object that has a mass of .1498kg and displaces 12.1 ml of water when placed in a graduated cylinder. A) .0124 g/ml B) 11.4 g/ml C) 12.4 g/ml D) 18.1 g/ml

D=M/V .1498kg / 12.1 ml = 12.4 g/ml

Which of these elements is a nonmetal? A) Na B) Mg C) Cu D) K E) Cl

E) Cl

Which of the following combinations of elements in a compound would be molecular? A) sodium and nitrogen B) calcium and oxygen C) sodium and sulfur D) potassium and chlorine E) nitrogen and oxygen

E) Nitrogen and Oxygen

A covalent bond is best described as: A) the sharing of electrons between atoms B) the transfer of electrons C) a bond between a metal and a nonmetal D) a bond between a metal and a polyatomic ion E) a bond between two polyatomic ions

E) a bond between two polyatomic ions

Which type of electromagnetic radiation has highest energy? A) microwave B) ultraviolet C) radio D) infrared E) gamma

E) gamma

What is the molecular geometry of CO3^2-? A) bent B) linear C) tetrahedral D) trigonal pyramidal E) trigonal planar

E) trigonal planar

20 C is equal to _______K. A) 313 B) 293 C) 263 D) All are the same

K = 273.15 + C 273.15K + 20 C = 293.15 C B) 293

What is the mass in grams of .250 mol of the common antacid calcium carbonate? A) 4.00 x 10^2g B) 25.0 g C) 17.0g D) 4.00 x 10^-2 E) 2.50 x 10^-3g

Molar mass CaCO3 = 100 g/mol 100 x 0.250 = 25.0 g

Hydroxylamine nitrate contains 29.17 mass % N, 4.20 mass % H, and 66.63 mass O. If its molar mass is between 94 and 98 g/mol, what is its molecular formula? A) NH2O5 B) N2H4O4 C) N3H3O3 D) N4H8O2 E) N2H2O4

N= 29.17 H= 4.2 O= 66.63 29.17 / 14.0067 = 2.082 2.08 / 2.08 = 1 N1 4.2 / 1.00794 = 4.1669 4.1669 / 2.08 = 2.00 H2 66.63 / 15.999 = 4.164 4.164 / 2.08 = 2.00 O2 B) N2H4O4

The number of neutrons in an atom of I-131 is A) 131 B) 78 C) 53 D) 77

The symbol used here indicates the atomic number (number of protons) is 53. This fact is redundant because the letter I indicates the element is iodine and iodine has 53 protons. The mass number (number of protons plus neutrons) is 131. By deduction, has: 131-53=78 neutrons.

According to the following balance reaction, how many moles of NO are formed from 8.44 moles of NO2 if there is plenty of water present? 3NO(g)+H2O(l)----->2HNO3(aq)+NO(g) A) 2.81 moles NO B) 25.3 moles NO C) 8.44 moles NO D) 5.50 moles NO E) 1.83 moles NO

Well the mol ratio is 3 : 1 or 1/3 moles of NO for each mole of NO2 So you have 8.44 mol of NO2 you would expect 1/3 x 8.44 of NO. = 2.81 mol

10. g of a certain metal absorb 40. cal of heat and the temperature is observed to rise from 20. C to 60. C. The specific heat of this metal is _________ cal/g C. A) .050 B) .10 C) .16 D) .40

q=MC(delta)T C = Q / M (delta)T C = 40 / (10g)(40) C = .10g/cal

What is the mass in grams of 1.000 mole of P2O5? A) 239.03 g B) 61.96 g C) 142.0 g D) 46.98 g

total mass=(molar mass O)*5+(molar mass P)*2 Since you have 2 Phosphorus and 5 Oxygen parts to this compound, 2*30.97 + 5*16=141.94g/mole C) 142.0 g