Semester questions chemistry

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11 when you balance a chemical equation, what are you doing?

applying Mendeleev’s law

applying the law of conservation of energy

applying the law of conservation of matter

applying the periodic law

12 which of the following equations describes a single -replacement reaction

2N2O5(g)–> O2(g)+4NO2(g)

Cl2(g) +2Kl(s)–> 2KCl(s)+l2(g)

2Na(s)+Cl2(g)–>2NaCl(s)

H2(g)+Br2(g)–>2HBr(g)

13 which of the following represents a correctly balanced chemical equation

Na2CO3(s)–>Na2O(s)+2CO2(g)

2ZnS(s)+2HCl(ag)–>4ZnCl2(ag)+H2S(g)

4Al(s)+3O2(g)–>2Al2O3(s)

Zn(s)+2HCl(ag)–>2ZnCl2(ag)+H2(g)

14 hydrogen gas and nitrogengas can react to form ammonia according to the following equation

N2(g)+3H2(g)–>2NH3(g)

how many liters of nitrogen gas are required to produce 2 moles of NH3(g)? one mole of gas occupies 22.4 liters under standard condtions of temperature and pressure STP

11.2L

22.4L

44.8L

67.2L

15 methane CH4, ammonia NH3, and oxygen can react to form hydrogen cyanide HCN and water according to this equation

2CH4+2NH3+3O2–>2HCN+6H2O

about how many grams of methane are required to produce 1 mole of HCN?

48g

16g

24g

34g

16 Carbonic acid H2CO3 forms when carbon dioxide CO2 dissolves in water according to this equation

CO2+H2O–>H2CO3

How many moles of CO2 must dissolve in an excess of water to produce 3 moles of H2CO3?

3mol

1mol

2mol

4mol

17 which of the following is a mixture of a gas dissolved in a liquid?

liquid hydrogen

dry ice (solid carbon dioxide)

soda pop

liquid oxygen

18 in a smple of which of these elements would you expect to find a sea of electrons surrounding nuclei?

N

O

Au

Ar

19 which of the following reactions often combines one reactant with oxygen?

synthesis

single-displacement

double-displacement

combustion

20  which of the following is correctly desribes the subatomic particles in the isotope 44Ca?

25 protons 20 elecrtons 24 neutrons

20 protons 24 electrons 25 neutrons

20 protons 20 electrons 24 neutrons

20 protons 24 electrons 20 neutrons

 
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