7th Describing Chemical Reactions

What is the number “4” in SiCl4?

• a subscript

• a coefficient

• a product

• a reactant

What can the arrow in a chemical reaction be translated to mean? Check all that apply.

• yields

• accompanied by

• react to form

• added to

• except

In a balanced chemical equation, _______________.

• atoms are conserved.
• molecules are equal.

A number written in front of a chemical formula is a(n) _____________________.

• coefficient
• subscript

The principle that states that matter is neither created nor destroyed during a chemical reaction is called the law of ___________________.

• conservation of mass
• conservation of molecules

A substance that is present after a reaction is the reactant.

• True
• False

In this model, the reactants are...

• 2H₂O
• H₂O₂
• 2H₂
• O₂

The law of conservation of mass was first demonstrated by the French chemist Antoine Lavoisier.

• True
• False

A chemical, present at the start of a chemical reaction, that is used up during a reaction is called a(n)

• product

• reactant

• word equation

• chemical equation

A chemical that is produced during a chemical reaction is called a:

• product

• reactant

• word equation

• chemical equation