Semester questions chemistry

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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