Chemistry

How many moles are there in 3.00 g of ethanol, CH3CH2OH? 0.00725 mol 0.0652 mol 15.3 mol 138 mol

0.0652 mol

What wavelength of light would you report in units of nm, if the light had a wavelength of 7.60 × 10-10 m? 0.0760 nm 0.760 nm 760 nm 7.60 nm

0.760 nm

How many moles of N2O4 are in 76.3 g N2O4? The molar mass of N2O4 is 92.02 g/mol. 7.02 x 103 moles 1.42 x 10-4 moles 1.00 mole 1.21 moles 0.829 moles

0.829 moles

Predict the charge of the most stable ion of potassium. 3+ 1- 2+ 2- 1+

1+

How many atoms of oxygen are contained in 47.6 g of Al2(CO3)3? The molar mass of Al2(CO3)3 is 233.99 g/mol. 1.23 × 1023 O atoms 2.96 × 1024 O atoms 2.87 × 1025 O atoms 1.10 × 1024 O atoms 3.68 × 1023 O atoms

1.10 × 1024 O atoms

What answer should be reported, with the correct number of significant figures, for the following calculation? (433.621 - 333.9) × 11.900 1.187 × 103 1.18680 × 103 1.1868 × 103 1.19 × 103

1.19 × 103

How many molecules of butane are contained in 25.0 mL of butane? The density of butane is 0.6011 g/mL and the molar mass is 58.12 g/mol. 2.59 × 1023 molecules butane 1.46 × 1027 molecules butane 6.87 × 1023 molecules butane 1.56 × 1023 molecules butane 7.14 × 1025 molecules butane

1.56 × 1023 molecules butane

How many anions are there in 2.50 g of MgBr2? 8.18 × 1021 anions 1.64 × 1022 anions 4.43 × 1025 anions 8.87 × 1025 anions

1.64 × 1022 anions

How many electrons does the Al3+ ion possess? 16 10 6 0 13

10

How many protons are in magnesium? 12 13 14 12.3 24.3

12

Determine the density of an object that has a mass of 149.8 g and displaces 12 .1 mL of water when placed in a graduated cylinder. 1.38 g/mL 0.45 g/mL 12.4 g/mL 2.45 g/mL

12.4 g/mL

Give the number of neutrons in Al+3. 10 16 17 13 14

14

How many moles of C8H18 contain 9.25 × 1024 molecules of C8H18 ? 65.1 moles C8H18 28.6 moles C8H18 34.9 moles C8H18 46.2 moles C8H18 15.4 moles C8H18

15.4 moles C8H18

Calculate the mass percent composition of lithium in Li3PO4. 26.75 % 17.98 % 30.72 % 55.27 % 20.82 %

17.98%

An ion has 8 protons, 9 neutrons, and 10 electrons. The symbol for the ion is ________. 17O2- 17O2+ 19F+ 19F- 17Ne2+

17O2-

How many electrons are in the ion, P3-? 12 18 28 34

18

How many silver atoms are contained in 3.75 moles of silver? 1.23 × 1024 silver atoms 2.26 × 1024 silver atoms 1.61 × 1023 silver atoms 2.44 × 1026 silver atoms 6.50 × 1025 silver atoms

2.26 × 1024 silver atoms

What is the mass of 8.50 x 1022 molecules of NH3? 0.00829 g 0.417 g 2.40 g 121 g

2.40 g

Calculate the molar mass for Mg(ClO4)2 223.21g/mol 123.76g/mol 119.52g/mol 247.52g/mol 75.76g/mol

223.21g/mol

Determine the volume of an object that has a mass of 455.6 g and a density of 19.3 g/cm3. 28.3 mL 14.3 mL 31.5 mL 23.6 mL

23.6 mL

How many electrons are in the ion, Cu2+? 27 29 31 64

27

How many electrons are in nickel? 28 30 31 30.7 58.7

28

What is the molar mass of nitrogen gas? 14.0 g/mol 28.0 g/mol 6.02 × 1023 g/mol 1.20 × 1023 g/mol

28.0 g/mol

What is the charge on the Sc ions in Sc2O3? 3- 1+ 2+ 3+

3+

How many moles are in 2.16 x 1024 atoms of silver? 35.9 moles 3.59 moles 0.359 moles 6.08 moles 1.79 moles

3.59 moles

How many neutrons are in nickel? 28 30 31 30.7 58.7

31

Calculate the molar mass of Ca3(PO4)2 87.05g/mol 215.21g/mol 310.18g/mol 279.21g/mol 246.18g/mol

310.18g/mol

How many cm3 are contained in 3.77 × 104 mm3? 3.77 x 104cm3 37.7 cm3 3.77 × 10-10 cm3 3.77 × 10-6 cm3

37.7 cm3

How many significant figures are in the measurement, 0.0005890 g? 5 7 4 6

4

How many mg does a 433 kg sample contain? 4.33 × 107 mg 4.33 × 10-3 mg 4.33 × 10-4 mg 4.33 × 108 mg

4.33 × 108 mg

How many atoms are in 2.50 moles of SO2? 4.52 x 1024 atoms 1.52 x 1024 atoms 5.02 x 1023 atoms 3.01 x 1024 atoms 7.53 x 1023 atoms

4.52 x 1024 atoms

How many SO32- ions are contained in 99.6 mg of Na2SO3? The molar mass of Na2SO3 is 126.05 g/mol. 1.52 × 1027 SO3 ions 4.76 × 1020 SO3 ions 2.10 × 1021 SO3 ions 1.05 × 1021 SO3 ions 9.52 × 1020 SO3 ions

4.76 × 1020 SO3 ions

How many molecules of N2O4 are in 76.3 g N2O4? The molar mass of N2O4 is 92.02 g/mol. 5.54 × 1025 N2O4 molecules 7.26 × 1023 N2O4 molecules 1.38 × 1024 N2O4 molecules 4.59 × 1025 N2O4 molecules 4.99× 1023 N2O4 molecules

4.99x1023 N2O4 molecules

An atom of 131Xe contains ________ electrons. 131 185 77 123 54

54

How many protons (p) and neutrons (n) are in an atom of barium-130? 56 p, 74 n 56 p, 130 n 74 p, 56 n 130 p, 56 n

56 p, 74 n

How many significant figures are in the measurement, 463.090 m? 6 3 5 4

6

The molecular weight of urea ((NH2)2CO), a compound used as a nitrogen fertilizer, is ________ amu(rounded to one decimal place) 44.0 43.0 60.1 8.0 32.0

60.1

How many cm are in 22.2 ft? 9483 cm 892 cm 420 cm 677 cm

677 cm

How many significant figures are in 1009.630 mL? 6 4 7 5

7

How many moles of potassium are contained in 300 g of potassium? 7.67 moles 1.44 moles 20.0 moles 15.8 moles 9.69 moles

7.67 moles

How many Fe(II) ions are there in 20.0 g of FeSO4? 2.19 × 10-25 iron(II) ions 7.92 × 1022 iron(II) ions 4.57 × 1024 iron(II) ions 1.82 × 1027 iron(II) ions

7.92 × 1022 iron(II) ions

How many Fe atoms are contained in 787 g of Fe? 5.90 × 1025 Fe atoms 7.09 × 1021 Fe atoms 8.49 × 1024 Fe atoms 4.27 × 1022 Fe atoms 4.18 × 1024 Fe atoms

8.49 × 1024 Fe atoms

If the temperature is 178°F, what is the temperature in degrees Celsius? 32 C 45 C 81.1 C 105 C

81.1 C

If a solution has a temperature of 355 K, what is its temperature in degrees Celsius? 625 C 72 C 82 C 165 C

82 C

Which of the following statements is TRUE? A scientific law summarizes a series of related observations. An observation explains why nature does something. A hypothesis is speculation that is difficult to test. Once a theory is constructed, it is considered fact.

A scientific law summarizes a series of related observations.

Identify an anion. An atom that has lost an electron. An atom that has gained an electron. An atom that has lost a neutron and a proton. An atom that has gained a neutron.

An atom that has gained an electron.

What is the element symbol for an atom that has 5 protons and 6 neutrons? B C H Na

B

Write the formula for barium nitrite. Ba3N2 BaNO3 BaN Ba(NO2)2 Ba(NO2)3

Ba(NO2)2

Write the formula for barium nitride. Ba3N2 Ba(NO3)2 BaN Ba2N3 Ba(NO2)2

Ba3N2

Which of the following elements is an alkali earth metal? Ce N Br K Be

Be

Which of the following elements is a halogen? As S Br Fe Kr

Br

What is the empirical formula for C12H24O6? C2H5O CHO C2H4O CHO2 CH2O

C2H4O

Determine the empirical formula for a compound that contains C, H and O. It contains 52.14% C and 34.73% O by mass. C2H6O CHO C4H13O2 CH4O3 CH3O

C2H6O

Write a possible molecular formula for C4H4O. C32H32O8 C12H12O2 C2H2O C8H8O

C32H32O8

Give the formula for calcium bisulfate CaHSO4 Ca2(HSO4)2 Ca2HSO4 Ca(HSO4)2

Ca(HSO4)2

Give the formula for calcium hydrogen sulfate. CaHSO4 Ca2(HSO4)2 Ca2HSO4 Ca(HSO4)2

Ca(HSO4)2

What is the chemical formula for calcium hydroxide? CaH2 CaOH CaOH2 Ca(OH)2

Ca(OH)2

The chemical formula for calcium nitride is Ca(NO3)2. Ca(NO2)2 Ca3N2. CaN2.

Ca3N2.

Which of the following elements is a transition metal? Ce N Br K Be

Ce

Give the structure for cesium chlorate. CsClO CsClO2 CsClO3 CsClO4

CsClO3

What is the chemical symbol for copper? Co Cr Cu C

Cu

What is the chemical formula for iron(III) sulfate? Fe3S Fe3SO4 Fe2S3 Fe2(SO4)3

Fe2(SO4)3

The chemical formula for nitrous acid is H3N(aq). H NO2(aq). H NO3(aq). H2N2O6(aq).

H NO2(aq)

Give the formula for sulfurous acid H2SO3 HSO3 H2SO4 HSO4

H2SO3

A student performs an experiment to determine the density of a sugar solution. She obtains the following results: 1.71 g/mL, 1.73 g/mL, 1.67 g/mL, 1.69 g/mL. If the actual value for the density of the sugar solution is 1.40 g/mL, which statement below best describes her results? Her results are both precise and accurate Her results are neither precise nor accurate. Her results are accurate, but not precise. Her results are precise, but not accurate.

Her results are precise, but not accurate.

What is the chemical symbol for mercury? Ag Au Hg Pb

Hg

Which of the following elements is a alkali metal? Ce N Br K Be

K

The solid compound, K2SO4, contains K+, S6+, and O2- ions. K+ and SO4 -2 ions. K2+ and SO4 -2 ions. K2SO4 molecules.

K+ and SO4 -2 ions.

Write the formula for the compound formed between potassium and sulfur. KS KS2 K2S K2SO3 K3S2

K2S

Identify the compound with ionic bonds. Ne CO N2 H2O KBr

KBr

Which of the following elements has the least tendency to form an ion? Ca K Kr Se

Kr

Which of the following elements is a noble gas? As S Br Fe Kr

Kr

Give the structure for lithium hypochlorite. LIClO LIClO2 LIClO3 LIClO4

LIClO

The chemical formula for lithium peroxide is LiOH. LiO2. Li2O. Li2O2.

Li2O2

Which of the following is a physical property? Iron has a tendency to rust. Ether is highly flammable. Mercury is a silvery liquid at room temperature. Sodium metal is extremely reactive with chlorine gas.

Mercury is a silvery liquid at room temperature.

What is the chemical formula for magnesium hydride? MgH2 MgOH MgOH2 Mg(OH)2

MgH2

Which of the following elements is a nonmetal? Ce N Br K Be

N

Determine the empirical formula for a compound that is found to contain 10.15 mg P and 34.85 mg Cl. P3Cl PCl PCl2 P2Cl3 PCl3

PCl3

Give the name for KMnO4 Potassium manganese tetraoxide potassium manganate potassium permanganate potassium pemagnesium potassium magnestate

Potassium permanganate

The chemical formula for the sulfite ion is S- S2- SO3up 2- SO4up2-

SO3up 2-

Give the formula for stannous nitrate Sn(NO2)3 Sn(NO3)3 Sn(NO3)2 Sn(NO2)2 Sn2(NO2)

Sn(NO3)2

Give the name for NaHSO3 -Sodium sulfite -sodium sulfate -sodium hydrogen sulfate -sodium hydrogen sulfite -sodium sulfide

Sodium hydrogen sulfite

A substance that can't be chemically broken down into simpler substances is an electron a compound a heterogeneous mixture an element

an element

All of the following elements are nonmetals EXCEPT arsenic. nitrogen. helium. oxygen

arsenic

Identify a liquid. no definite shape and no definite volume definite volume and definite shape definite shape and no definite volume definite volume and no definite shape

definite volume and no definite shape

Determine the name for Cl2O. chlorine oxide dichlorine monoxide chlorine (I) oxide chlorine (II) oxide chlorate

dichlorine monoxide

Determine the name for N2O5 Dinitrogen pentoxide nitrogen oxide Nitrogen (IV) oxide nitrogen(II) oxide nitrogen tetroxide

dinitrogen pentoxide

Which of the following elements is classified as a semimetal? calcium germanium fluorine uranium

germanium

Iodine belongs to the ________ group of the periodic table. alkali metal alkaline earth metal halogen noble gas

halogen

Which of the following exists as a diatomic molecule? hydrogen carbon phosphorus lithium krypton

hydrogen

The Scientific Method is a framework for proving an argument you know to be true. is a strict set of rules and procedures that lead to inarguable fact. is just a theory. is based on continued observation and experiment.

is based on continued observation and experiment.

Write the name for PbS. lead (I) sulfate lead (I) sulfide lead (II) sulfide lead (II) sulfate lead sulfide

lead (II) sulfide

A chemical change occurs when when koolaid powder dissolves in water. methane is burned. when ice melts. when water boils.

methane is burned.

Isotopes differ in the number of beta particles. protons. electrons. neutrons. neutrons and protons.

neutrons

Give the name for HNO3 Nitric acid Nitrous acid hydrogen nitrate hydrogen nitrite hydrogen nitride

nitric acid

Which of the following exists as a polyatomic molecule? neon carbon phosphorus lithium krypton

phosphorous

Identify the element that has an atomic number of 15. sulfur oxygen phosphorus silicon

phosphorus

Give the name for PBr3. phosphorus tribromide potassium tribromide phosphorus (III) bromide phosphorus (II) bromide phosphorus bromide

phosphorus tribromide

Choose the element from the list below. sodium water carbon dioxide sodium chloride

sodium

Give the name for NaHSO3 -Monosodium sulfite -monosodium sulfate -sodium bisulfate -sodium bisulfite -sodium bisulfide

sodium bisulfite

Write the name for Sr3(PO4)2. strontium (III) phosphite strontium (II) phosphite strontium phosphate tristrontium phosphorustetraoxide strontium phosphite

strontium phosphate

Choose the pure substance from the list below. a casserole sugar water sugar iced tea

sugar

Molecules can be described as two or more atoms chemically joined together. heterogeneous mixtures. mixtures of two or more pure substances. mixtures of two or more elements that has a specific ratio between components.

two or more atoms chemically joined together.