Chemical Reactions

Front

What are valence electrons?

Back

Valence electrons are the electrons in the outermost shell of an atom that are involved in forming bonds with other atoms.

Front

How many valence electrons do Noble Gases have?

Back

Noble Gases have 8 valence electrons, making them stable and unreactive.

Front

What is a precipitate?

Back

A precipitate is a solid that forms when two liquids are mixed together and a chemical reaction occurs.

Front

What are reactants in a chemical reaction?

Back

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

Front

What is evidence of a chemical reaction?

Back

Evidence of a chemical reaction includes production of light/heat, formation of a gas, and formation of a precipitate.

Front

What is NOT evidence of a chemical reaction?

Back

Melting is NOT evidence of a chemical reaction; it is a physical change.

Front

What is a chemical change?

Back

A chemical change is a process where substances combine or break apart to form new substances.

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What happens during a chemical reaction?

Back

During a chemical reaction, bonds between atoms are broken and new bonds are formed, resulting in new substances.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.