Chemistry Exam Review

Chemical equations ___.

• describe chemical reactions
• show how to write chemical formulas
• give directions for naming chemical compounds
• describe only biological changes

In the chemical equation H₂O₂ → H₂O + O₂, H₂O is a ___.

• catalyst
• solid
• product
• reactant

Tags

NGSS.MS-PS1-5

If you rewrite the following word equation as a balanced chemical equation, what will the coefficient and symbol for nitrogen be?
nitrogen trifluoride → nitrogen + fluorine

• 2N
• 2N₂
• N₂
• 4N

What are the coefficients that will balance the skeleton equation below?
N₂ + H₂ → NH₃

• 1,1,2
• 1,3,3
• 3,1,2
• 1,3,2

When the equation KClO₃ → KCl + O₂ is balanced, the coefficient of KClO₃ is ___.

• 1
• 2
• 3
• 4

Tags

NGSS.HS-PS1-7

What are the missing coefficients for the skeleton equation below?
Cr + Fe(NO₃)₂ → Fe + Cr(NO₃)₃

• 4,6,6,2
• 2,3,2,3
• 2,3,3,2
• 1,3,3,1

The product of a combination reaction is BaCl₂.  If one of the reactants is Ba, what is the other reactant?

• Cl
• Cl₂
• BaCl₂
• Ba

The products of a complete combustion reaction do NOT include ___.

• water
• hydrogen
• carbon dioxide

In a double-replacement reaction, the ___.

• products are always molecular
• reactants are two ionic compounds
• reactants are two elements
• products are a new element and a new compound

What are the correct formulas and coefficients for the products of the following double-replacement reaction?
RbOH + H₃PO₄ →

• Rb(PO₄)₃ + H₂O
• RbPO₄ + 2H₂O
• Rb₃PO₄ + 3H₂O
• H₃Rb + PO₄OH