KC- CH12 Stoichiometry

What does a balanced chemical equation provide, similar to a recipe?

• Quantitative information about the reactants and products

• The precise timing for a chemical reaction

• The safety measures needed in a chemical reaction

• The temperature at which a reaction should be carried out

What is stoichiometry primarily concerned with?

• The study of chemical reactions at different temperatures

• The color changes in chemical reactions

• The calculation of amounts of substances involved in chemical reactions

• The sound produced during chemical reactions

What do the coefficients in a balanced chemical equation indicate?

• The physical state of the reactants and products

• The temperature at which the reaction occurs

• The color of the reactants and products

• The relative numbers of moles of reactants and products

According to the law of conservation of mass, what is conserved in every chemical reaction?

• Volume and color

• Mass and atoms

• Temperature and pressure

• Light and sound

How many wheels are needed to make 640 tricycles, considering each tricycle requires three wheels?

• 1920 wheels

• 2130 wheels

• 1280 wheels

• 1600 wheels

How many molecules of NH3 could be made from 5 molecules of N2 and 15 molecules of H2?

• 20 molecules of NH3

• 5 molecules of NH3

• 15 molecules of NH3

• 10 molecules of NH3

What is the balanced equation for the burning of hydrogen sulfide?

• 2H2S(g) + O2(g) -> SO2(g) + 2H2O(g)

• H2S(g) + O2(g) -> SO2(g) + H2O(g)

• H2S(g) + 2O2(g) -> 2SO2(g) + H2O(g)

• 2H2S(g) + 3O2(g) -> 2SO2(g) + 2H2O(g)

How many moles of aluminum are needed to form 3.7 mol Al2O3?

• 3.7 mol Al

• 7.4 mol Al

• 5.55 mol Al

• 4.4 mol Al

What quantities are always conserved in chemical reactions?

• Mass and energy

• Atoms and moles

• Mass and atoms

• Moles and energy

How many grams of acetylene are produced by adding water to 5.00 g CaC2?

• 2.6 g C2H2

• 4.1 g C2H2

• Cannot be determined from the given information

• 3.5 g C2H2