Reactions Review

The products of a chemical reaction are on the

• Left side (Products → Reactants)

• Right side (Reactants → Products)

The reactants of a reaction are on the

• Left side (Reactants → Products)

• Right side (Products → Reactants)

The law of conservation of mass states that

• The mass of a system (reaction) increases from beginning to end

• The mass of a system (reaction) stays the same from beginning to end

• The mass of a system (reaction) decreases from beginning to end

Tags

NGSS.MS-PS1-5

Is this equation balanced? 
(Are there the same amount of H and O atoms on both sides of the equation?)

   $H_2O_2\rightarrow\ H_2O\ +\ O_2$  

• Yes

• No

Tags

NGSS.MS-PS1-5

Classify the following reaction:

2Na (s) + NiCl₂ (aq) → Ni (s) + 2NaCl (aq)

• combustion

• synthesis

• single replacement

• decomposition

• double replacement

Classify the following reaction:

2Cu (s) + I₂ (g) → 2CuI (s)

• combustion

• synthesis

• single replacement

• decomposition

• double replacement

What is a coefficient?

• The small number on the right of the chemical symbol.
• The large number in front of a chemical formula.
• The number in between the chemical symbols.
• The number behind a chemical formula.

Tags

NGSS.MS-PS1-5

What is the little number after an element in a chemical equation called.
Example: H₂

• Coefficient 
• Subscript
• Atom
• Equation

What coefficient should be used to make the following equation balanced?
N₂+O₂--> _NO 

• 1
• 2
• 3
• 4

Tags

NGSS.MS-PS1-5

Which problem is balanced?
(Check ALL answers)

• PbO₂ + 2H₂
• SO₂ + H₂0 --> H₂SO₄
• 2Na + 2H₂O --> 2NaOH + H₂

Tags

NGSS.MS-PS1-5