EL#04 Chemical Reactions Review

Front

What does the law of conservation of mass state?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; the total mass of the reactants equals the total mass of the products.

Front

What is a decomposition reaction?

Back

A decomposition reaction is a type of chemical reaction where a single compound breaks down into two or more simpler products.

Front

What is the chemical formula for the ionic bond formed between potassium and iodine?

Back

The chemical formula for the ionic bond formed between potassium and iodine is KI.

Front

How can you determine if a chemical equation is balanced?

Back

A chemical equation is balanced if the number of atoms of each element is the same on both sides of the equation.

Front

What is an example of a chemical change?

Back

Frying an egg is an example of a chemical change because it involves a change in the chemical composition of the egg.

Front

What are some signs that a chemical reaction has occurred?

Back

Signs that a chemical reaction has occurred include a change in color, temperature, formation of a precipitate, or gas production.

Front

What is a precipitate?

Back

A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form or appearance of a substance without changing its chemical composition, while a chemical change results in the formation of new substances with different properties.

Front

What is the significance of balancing chemical equations?

Back

Balancing chemical equations is significant because it ensures that the law of conservation of mass is upheld, showing that the same number of each type of atom is present before and after the reaction.

Front

What is the role of reactants in a chemical reaction?

Back

Reactants are the starting substances that undergo a chemical change to form products in a chemical reaction.