chem exam review

a sealed flask contains 1 mole of hydrogen gas and 3 moles of helium gas at 20 C. if the total pressure is 400 torr the partial pressure of hydrogen is? a 100 torr b 200 torr c 300 torr d 400 torr

a

at STP, 1 L of oxygen gas would have the same number of molecules as a 1 L of H2 b 2 L of CO c 3 L of CO2 d 3 L of Ne

a

element X is a metal that forms an oxide with the formula X2O. element X is a member of group? a 1 b 2 c 13 d 16 3 18

a

the _____ law of thermodynamics states that energy is neither created nor destroyed/ a first b second c third d fourth

a

the correct name for AlO3 is? a aluminum oxide b aluminum (III) oxide c aluminum trioxide d aluminum (I) oxide

a

water has specific heat of 4.184 J/g deg while glass (pyrex)has a specific heat of .780. if 10.0 J of heat s added to 1.00 g of each of these, which will experience the larger increase of temp? a glass b water c both will experience the same change since both receive the same heat d not enough info.

a

what is the correct formula for copper (II) sulfate pentahydrate? a CuSO4 * 5H2O b 5CuSO4 * H2O c Cu2SO4* 5H2O d CuSO4* 6H2O

a

which change of phase is exothermic? a gas to liquid b solid to liquid c solid to gas d liquid to gas

a

which if the following can be classified as a metalloid? a B b Br c Ba d Rb e none of these

a

which of the following doesn't describe properties of metallic bonding? a brittle b conductive c malleable d insoluble

a

which of the following is most likely to form an ionic bond? a magnesium and sulfur b sodium and iron c carbon and oxygen d hydrogen and helium

a

this density of aluminum is 2.70 g/cm. this means that a 50.0 g sample of aluminum occupies a volume of a 18.5 cm^3 b 50 cm^3 c 135 cm^3 d .0540 cm^3

a 18.5 cm^3

the accepted value is 1.43. given the experimental data below, how would you describe the student's data? trial measurement 1 1.29 2 1.93 3 .88 a accurate but not precise b precise but not accurate c both accurate and precise d neither accurate nor precise

a accurate but not precise

which of these has the smallest number of neutrons per atom? a argon-39 b potassium- 39 c calcium- 40 d chlorine-35

a argon-39

separation of liquids by distillation requires that the liquids have different a boiling points b densities c solubilities d melting points e none of these

a boiling points

an atom of nitrogen Is likely to/ a gain 3 electrons to have a charge of +3 b gain 3 electrons to have a charge of +3 c lose 3 electrons to have a charge of -3 d lose 3 electrons to have a charge of +3

a gain 3 electrons to have a charge of +3

as an atom gains electrons, its radius? a increases b decreases c stays the same

a increases

a gas is confined in a steel tank with a volume of 6.982 L. at 20.20 C, the gas exerts a pressure of 8.532 atm. after heating the tank, the pressure of the gas increases 1o 10. 406 atm. what is the temp of the heated gas? a -32.60 C b 24.63 C c 84.59 C d 92.64 C

b

as the frequency of a wave increase, the wavelength? a increase b decreases c stays the same

b

as the pressure on a sample of a given gas increases at constant temperature, the volume of the gas a increase b decreases c stays the same

b

as the temperature of a gas increases with the volume remaining constant, the pressure a decreases b increases c stays the same

b

as the temperature of a sample of an ideal gas increases at constant pressure, the volume of the sample: a decreases b increases c stays the same

b

if 1.45 J of heat are added to a 200.0 g sample of aluminum metal and the temp of the metal increases by .798 C, what is the specific heat of aluminum? a .579 b .909 c 1.68 d 3.63

b

sodium has a greater ionization energy than potassium because? a sodium has a larger radius than potassium b sodium has fewer energy levels than potassium c sodium has a greater effective nuclear charged sodium has more protons

b

under which conditions of temperature and pressure would a real gas be most likely to behave as an ideal gas? a high temp and high pressure b high temp and low pressure c low temp and high pressure d low temp and low pressure

b

what is the percent by mass of oxygen in CuO? a 16% b 20% c 25% d 50%

b

what quantity of gas, in moles, is contained in 2.21 L at STP? a .0454 b .0987 c .1974 d .2948

b

which of the following correctly depicts the trend in atomic radius? a increase across a period, increase down a group b decrease across a period, increase down a group c increase across a period, decrease down a group d decrease across a period, decrease down a group

b

which sample of methane contains the greatest number of molecules at standard temperature? a 22.4 L at 1 atm b 22.4 L at 2 atm c 11.2 L at 1 atm d 11.2 L at 2 atm

b

what is the correct nuclear symbol for an atom that contains 9 protons and 10 neutrons? a 9F b 19F c 19K d 1H

b 19F

if 3.4 g of magnesium reacts completely with oxygen to form 5.6 g of magnesium oxide, how many grams of oxygen reacted? a 3.4 g b 2.2 g c 5.6 g d 4.3

b 2.2 g

how many orbitals are in the p level? a 2 b 3 c 5 d 5

b 3

a student measures the boiling point of a liquid called acetone and finds it to be 65.0 C. a reference book shows the value should be 63.0 C. what is the percent error? a 2.0% b 3.2% c .0314% d 63.0%

b 3.2%

elements that have low ionization energies a tend to have small radii b tend to have low electronegativities c tend to form ions d tend to be found on the right side of the periodic table

b tend to have low electronegativites

a sample of neon gas occupies a volume of 752 mL at 25 C. what volume will the gas occupy at 50 C if the pressure remains constant? a 204 mL b 408 mL c 815 mL d 8150 ml

c

as the pressure on a given sample of gas increases at constant temperature the mass of the sample a increases b decreases c stays the same

c

at constant pressure, the volume of a mole of any ideal gas varies a directly with the radius of the gas molecule b inversely with the radius of the gas molecule c directly with the kelvin temperature d inversely with the kelvin temperature

c

helium filled balloon has a volume of 50.0 L at 25 C and 1.08 atm. what volume will the gas occupy at .855 atm and 10. 0 c? a 15 L b 30 L c 60 L d 120 L

c

how many moles are present in 2.16 grams of silver? a .0200 b .0459 c 200 d 233

c

the pressure of 20 mL of a gas at constant temp from 4 atm to 2 atm. the new volume of the gas is a 5 mL b 10 mL c 40mL d 80mL

c

what is the equation for calculating heat? a c= m x q x eT b m= c x qx eT c q= c x m x eT d eT= c x m x q

c

which element requires the least amount of energy to remove its loosely bound electron? a Li b Mg c K d Ne

c

if 12.4 is added to 5.200 how should the final answer be recorded? a 17.600 b 17.60 c 17.6 d 18

c 17.6

if 8.65 is divided by 3.268, how many sig figs should be in the final answer? a 1 b 2 c 3 d 4

c 3

a fluorine ion will have the same electron config. as? a 4p b 3s c 5p d 5s e 4f

c 5p

which of the following correctly describes one of the subatomic particles? a electron: 1 amu, neg. charge, around the nucleus b proton: 1 amu, pos. charge, around the nuclues c electron: negligible mass, neg. charge, around the nucleus d proton: negligible mass, pos. charge, in the nucleus

c electron: negligible mass, neg. charge, around the nucleus

Rutherford's gold foil experiment indicated that? a the nucleus of an atom occupies most of the atoms volume b positive charges are dispersed throughout the atom c positive charges are concentrated in a very small core at the atom's center d protons and neutrons are located in the nucleus

c positive charges are concentrated in a very small core at the atom's center

two isotopes of oxygen differ in? a the # of electrons b the # of protons c the # of neutrons d both b and c

c the # of neutrons

4 liters of gas at atmospheric pressure is compressed into a .85 L cylinder. what is the pressure of the compressed gas if its temp remains constant? a .15 atm b .21 atm c 3.4 atim d 4.7 atm

d

Mendeleev's periodic table was able to predict? a the atomic # of unknown elements b the chemical properties of unknown elements c the existence of unknown elements d both b and c

d

the correct formula for lead (IV) oxide is a PbO b Pb2O c PbO2 d Pb2O4

d

the molar mass of NiCl2 * 2H2O is? a 94.2 g/mol b 130 g/mol c 148 g/mol d 166 g/mol

d

what is the correct formula for aluminum sulfate? a Al2S3 b Al3S2 c Al2SO4 d Al2(SO4)3 e AlSO4

d

which of the following elements is the most metallic? a Au b F c Fe d Cs

d

which of the following would demonstrate bonding in a "sea of electrons?" a NaCl b SiO2 c CO2 d Ag

d

what is the maximum number of electrons that can occupy a 3d sublevel? a 2 b 6 c 8 d 10 e 14

d 10

how many valence electrons are present in calcium? a 40 b 20 c 8 d 2 e 1

d 2

how many atoms are present in 3Cu(NO3)2? a 5 b 9 c 11 d 27

d 27

how many electrons are in a neural atom of lithium? a 10 b 7 c 4 d 3 e 1

d 3

how many unpaired electrons are there in a phosphorous atom? a 0 b 1 c 2 d 3

d 3

which of the following has exactly 5 sig figs? a 50,000 b .0050 c .0500 d 5.0000

d 5.0000

which of these has the smallest number of sig figs? a 6.050 b 0.06050 c .6050 d 6050

d 6050

which element has the electron config. 1s^2 2p^2 3s ^2 3p^6 4s^1 3d^5? a zinc b copper c nickel d chromium d potassium

d chromium

which of these is a physical change? a burning b color change c a precipitation forms d condensation forms

d condensation forms

which of the following would be most useful for identifying a substance? a length b volume c color d density

d density

which of the following can be classified as a homogeneous mixture? a vegetable soup b water c copper d hot tea e none of these

d hot tea

ionic compounds are conductive? a in liquid form b in aqueous solution c in solid form d a and b only

e

which of the following is a property of an ionic compound/ a dissolves in water b conducts electricity when melted c forms structures called crystal lattices d melts at high temps e all of these

e

which of the following statements is true? a mixtures may be classified as either homogenous or heterogeneous b mixtures can lose their individual properties when mixed c the percentages of the components may vary d all of these are true e both a and c are true

e both a and c are true

considering the elements in group 16, as you move down the group the electrons in their valence shell? a increases b decreases c remains the same

stays the same