Chemical Reactions - Unit Review

The limiting reactant

• slows the reaction down
• is used up first
• is the reactant that is left over
• controls the speed of the reaction

Which type of reaction occurs without being started by some outside force?

• activation energy reaction

• physical reaction

• spontaneous reaction

• combustion reaction

What goes in the missing blanks?
SnO₂ + __ H₂ → Sn + __ H₂O

• 5
• 1
• 3
• 2

Tags

NGSS.HS-PS1-7

NGSS.HS-PS1-2

At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?

• the product is doubled
• the product is half the mass of the reactants
• the mass is the same
• the mass changes depending on the reaction

What happens in an Endothermic reaction?

• More energy is released

• Energy is used up

• The substance heats up

• The temperature of the substance stays the same

What happens in an Exothermic reaction?

• More energy is released
• Less energy is released
• The substance's temperature stays the same
• The substance gets colder

Tags

NGSS.HS-PS1-4

What is striking a match an example of?

• providing activation energy to a chemical reaction

• an endothermic process

• an endothermic reaction

• providing activation energy to a physical reaction

What type of reactions is this:

C₃H₈ + O₂ --> H₂O + CO₂

• Synthesis (combination)

• Decomposition

• Single replacement

• Combustion

Solubility refers to the mass of solute that can dissolve in a certain volume or mass of ____________, at a certain temperature.

• volume

• proportion

• solvent

• particles

An ______ is a compound that breaks apart in water, forming charged particles (ions) that can conduct electricity.

• electrolyte
• nonelectrolyte
• polar molecule
• non polar molecule