Ch. 4 Chemical Reactions Test

Is this reaction balanced? If not, select the choice that best explains why it is not balanced.

Mg(NO₃)₂ + 2Na --> 2NaNO₃ + Mg

• No because Mg is not balanced

• No because N is not balanced

• No because Na is not balanced

• No because O is not balanced

• yes

Tags

NGSS.MS-PS1-5

Which coefficient must go in the missing spot to balance the chemical equation?

___Cu + O₂ --> 2Cu₂O

• 4

• 1

• 5

• 3

Tags

NGSS.MS-PS1-5

What type of reaction is below?

Cu₂O + K --> K₂O + Cu

• Combination/Synthesis

• Decomposition

• Double Replacement

• Combustion

• Single Replacement

What type of reaction is below?

H₂O --> H₂ + O₂

• Combination/Synthesis

• Decomposition

• Single Replacement

• Double Replacement

What type of reaction is below?

Mg(NO₃)₂ + Na₂O --> NaNO₃ + MgO

• Combination/Synthesis

• Single Replacement

• Double Replacement

• Combustion

Balance the following reaction: ___Na + ___O₂ --> ___Na₂O

• 4Na, 2O₂, 3Na₂O

• 2Na, 2O₂, 3Na₂O

• 4Na, O₂, 2Na₂O

• 1Na, O₂, 2Na₂O

Tags

NGSS.MS-PS1-5

In this reaction, how many oxygens are there on each side?

Al(NO₃)₃ + 3Na --> 3NaNO₃ + Al

• 10

• 9

• 7

• 3

Tags

NGSS.MS-PS1-5

We have to balance formulas due to the law of conservation of ____

• mass/matter.

• energy.

• temperature.

• mete.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

When a scientist mixed two chemicals, an exothermic reaction takes place. Which of the following would be proof that the reaction was exothermic?

• a change of color
• a change of state
• a temperature decrease
• a temperature increase

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What types of reactions absorb and release heat?

• acidic and basic
• endothermic and exothermic
• endothermic and heat transfusion
• covalent and ionic

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

NGSS.MS-PS3-4