Chemical Reactions and Conservation of Mass

What principle states that mass is neither created nor destroyed in a chemical reaction?

• Law of Conservation of Energy

• Law of Conservation of Mass

• Law of Thermodynamics

• Law of Chemical Equilibrium

What is meant by the term 'stoichiometry' in chemistry?

• The study of chemical bonds and their properties.

• The calculation of reactants and products in chemical reactions.

• The process of balancing chemical equations.

• The measurement of temperature in chemical reactions.

What are the substances called that are listed to the right of the arrow in a chemical reaction?

• Reactants

• Catalysts

• Products

• Solvents

What does the symbol '→' represent in a chemical equation?

• It represents the direction of the reaction, indicating that reactants are converted to products.

• It indicates the temperature at which the reaction occurs.

• It shows the physical state of the reactants and products.

• It denotes the equilibrium position of the reaction.

How many atoms of carbon (C) are in the molecule C6H12O6?

• 4

• 6

• 8

• 10

How many elements are found in the molecule Mg(ClO3)2?

• 2

• 3

• 4

• 5

Can matter be created or destroyed in a chemical reaction?

• Yes, matter can be created.

• Yes, matter can be destroyed.

• No, matter is always conserved.

• Only in nuclear reactions can matter be created or destroyed.

What is the left part of a chemical equation called?

• Reactants

• Products

• Catalysts

• Solvents

How do you determine the number of atoms in a molecule?

• By adding the subscripts of each element in the molecular formula.

• By counting the number of elements in the formula.

• By multiplying the coefficients of each element by their atomic mass.

• By using the molecular weight of the compound.

What is a balanced chemical equation?

• A chemical equation where the number of atoms for each element is the same on both sides.

• A chemical equation that shows the reaction rate of a substance.

• A chemical equation that includes only reactants without products.

• A chemical equation that represents a physical change rather than a chemical change.