Review Flashcard for 7R Chemistry 2 Test

Front

What is evidence that a chemical reaction has occurred?

Back

An increase in temperature of the solution is evidence of a chemical reaction.

Front

Does mixing/dissolving Kool-Aid powder and water create a new substance?

Back

False, it creates a solution, not a new substance.

Front

Which of the following is not a chemical reaction?

Back

Melting of ice is not a chemical reaction.

Front

What three things are always equal for an atom?

Back

Atomic number, protons, and electrons are always equal for an atom.

Front

What does the number '18' in a periodic table square represent?

Back

The number '18' represents the atomic number of the element.

Front

What is a chemical reaction?

Back

A process that leads to the transformation of one set of chemical substances to another.

Front

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

Back

A physical change does not alter the chemical composition, while a chemical change does.

Front

What is the law of conservation of mass?

Back

In a chemical reaction, mass is neither created nor destroyed.

Front

What are reactants in a chemical reaction?

Back

Reactants are the starting substances that undergo change.

Front

What are products in a chemical reaction?

Back

Products are the substances formed as a result of a chemical reaction.