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
Cl2(g) +2Kl(s)--> 2KCl(s)+l2(g)
13 which of the following represents a correctly balanced chemical equation
14 hydrogen gas and nitrogengas can react to form ammonia according to the following equation
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
15 methane CH4, ammonia NH3, and oxygen can react to form hydrogen cyanide HCN and water according to this equation
about how many grams of methane are required to produce 1 mole of HCN?
16 Carbonic acid H2CO3 forms when carbon dioxide CO2 dissolves in water according to this equation
How many moles of CO2 must dissolve in an excess of water to produce 3 moles of H2CO3?
17 which of the following is a mixture of a gas dissolved in a liquid?
dry ice (solid carbon dioxide)
18 in a smple of which of these elements would you expect to find a sea of electrons surrounding nuclei?
19 which of the following reactions often combines one reactant with oxygen?
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