Chemical Reactions, Matter and Energy

In an endothermic reaction, heat is ...

• taken in or absorbed

• given out or released 

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Exothermic reactions...

• Absorb energy

• Release energy

• Release Color

• Absorb Color

Tags

NGSS.MS-PS1-4

NGSS.MS-PS1-2

NGSS.MS-PS3-3

NGSS.MS-PS3-5

When does a chemical reaction stop?

• When the lab is finished

• When the excess reactant is used up

• When the limiting reactant is used up

• Chemical reactions never stop

What is essential for a combustion reaction to begin?

• Carbon dioxide

• Fuel 

• Fuel, oxygen and heat

• Water and oxygen

Which of the following shows the correct way to balance the chemical equation?
Fe + O₂ -> Fe₂O₃

• 4Fe + 3O₂ -> 2Fe₂O₃

• 2 Fe + 3O₂ -> Fe₂O₆

• 4 Fe + O₆ -> 2Fe₂O₃

• None of the options are correctly balanced.

Tags

NGSS.MS-PS1-5

What happens in ALL chemical changes?

• Change in state of matter

• A new substance is formed

• Bubbles are produced

• An explosion

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

According to the law of conservation of mass, how does the amount of each element on the product side compare to each element on the reactant side?

• The amount of atoms on each side is equal

• The amount of atoms on the product side is greater

• The amount of atoms on the reactant side is greater

• Depends on the reaction

Tags

NGSS.MS-PS1-5

Balance the following chemical equation:

____KClO₃ → ____KCl + ____O₂

• 2KClO₃ → 4KCl + O₂

• 4KClO₃ → 2KCl + 3O₂

• 2KClO₃ → 2KCl + 3O₂

Tags

NGSS.MS-PS1-5

Which reaction type is the following: C₅H₁₀ + O₂ --> CO₂ + H₂O

• Decomposition

• Synthesis

• Complete Combustion

• Double Replacement

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

In chemical reactions, what does the principle of conservation of mass mean?

• Matter is not created or destroyed.

• The total mass of the reactants is greater than the total mass of the products.

• The total mass of the reactants is less than the total mass of the products.

• Matter is not changed.
  

Tags

NGSS.MS-PS1-5