Chemical Reaction Review

How many atoms does substance 3 contain?

• 12
• 15
• 8
• 4

Is the following equation balanced?

• No, there are more atoms on the reactant side.
• No, there are more atoms on the product side.
• Yes, there are equal number of atoms on both sides.
• Yes, even though the reactant side has two more atoms.

In an endothermic reaction, heat is ...

• taken in or absorbed
• given out or released 

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Baking bread and cooking an egg absorb energy and are examples of....?

• Endothermic processes

• Exothermic processess

• None of these

Exothermic reactions...

• Absorb energy
• Release energy
• Release Color
• Absorb Color

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS3-4

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

Balance this equation...
HgO --> Hg + O₂

• It is balanced 
• 2HgO --> Hg + O₂
• 2HgO --> 2Hg + O₂
• I don't know...Oh well!

Tags

NGSS.MS-PS1-2

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-PS1-2

NGSS.MS-PS1-5

Is the following equation balanced or unbalanced?
Fe + S --> FeS

• balanced
• unbalanced

Tags

NGSS.MS-PS1-5

In reactions, the number of atoms in the products must be equal to..

• the end of the equation.

• the Reactants

• the Starters

• the Enders