Chemistry Regents Exam Review HW 6 (Stoichiometry)

What does stoichiometry measure in chemical reactions?

• The speed of the reaction

• The mass of chemicals involved

• The color changes in the reaction

• The temperature of the reaction

Why is carbon-12 used as a standard in defining atomic mass units?

• Because it is the lightest element

• Because it is rare and valuable

• Because it has a stable isotopic composition

• Because it is the heaviest element

What is the significance of Avogadro's number in chemistry?

• It defines the number of particles in a mole

• It indicates the speed of chemical reactions

• It determines the color of chemicals

• It measures the temperature of a reaction

What does the molar mass of a compound represent?

• The combined mass of one mole of each element in the compound

• The mass of one atom of each element in the compound

• The color of the compound

• The mass of one molecule of the compound

How do you balance a chemical equation?

• By altering the color of the products

• By ensuring the number of atoms for each element is the same on both sides

• By changing the temperature of the reactants

• By adjusting the speed of the reaction