Unit 7 Chemical Reactions

Identify this type of reaction: 
Al (s) + HCl (aq) → AlCl₃ (aq) + H₂ (g)

• Precipitation
• Synthesis
• Combustion
• Single Replacement

The Law of Conservation of Matter states that the total mass of the reactants should be: 

• More than the mass of the products
• Equal to the mass of the products
• Ignored during the reaction
• Less than the mass of the products

Tags

NGSS.HS-PS1-7

Which coefficients are required to correctly balance the equation: 
__C₂S₂ + __O₂ → ___CO₂ + ___S₂O

• 1, 2, 3, 2
• 2, 5, 4, 2 
• 2, 4, 5, 2
• 2, 3, 5, 2 

Tags

NGSS.HS-PS1-7

In the following reaction, what sign is there that a precipitation reaction took place?
AgNO₃ (aq) + NaOH (aq) → AgOH (s) + NaNO₃ (aq)

• The formation of a nitrate
• The (aq), meaning aqueous or dissolved in water
• The (s), meaning the formation of a solid
• The base (OH) reactant 

Which of the following reactions involves the ions of two compounds exchanging places to form two new compounds?

• Synthesis 
• Double Replacement
• Combustion
• Single Replacement

When balancing equations, the rule is that you can only add, change, and remove:

• Coefficients
• Mass
• Subscripts
• Elements 

Tags

NGSS.HS-PS1-7

The formation of water is an example of a ________ reaction because two simple substances (H and O) combine to produce a new compound (H₂O).

• Single Displacement
• Decomposition
• Double Replacement
• Synthesis

The following reaction is an example of what reaction type? 
CoCO₃ → CoO + CO₂

• Synthesis
• Decomposition
• Single Replacement
• Double Replacement

Combustion reactions will always involve

• Oxygen and a solid
• Liquid nitrogen and heat
• Oxygen and heat/energy
• CO₂ and light

Tags

NGSS.HS-PS1-1

What is the Law of Conservation of Mass?

• It states that no matter can be created or destroyed.
• It states that no energy can be created or destroyed.
• It states that matter can be created or destroyed.
• It states that no sound can be created or destroyed.

Tags

NGSS.HS-PS1-7