What types of reactions absorb and release heat?

endothermic and heat transfusion

Increasing the concentration of a reactant in a chemical reaction will _____________.

increase the rate of the reaction

decrease the rate of the reaction

stop the reaction from happening

have no effect on the rate of the reacion

Which of the following represents a chemical change?

burning a piece of notebook paper in the presence of oxygen

cutting a piece of paper with scissors

cooling a mixture of air and kerosene vapor to obtain liquid kerosene

heating water over a flame to its boiling point

If you combine two substances in a beaker at room temperature and the beaker feels cold to the touch, it means that the substances:

have undergone an endothermic reaction

have not reacted with each other

have undergone a physical change

have undergone an exothermic reaction

In any chemical reaction, the mass of the products is always:

the same as the mass of the reactants

slightly less than the mass of the reactants

much less than the mass of the reactants

greater than the mass of the reactants

How do chemical reactions turn substances into new substances?

the atoms break apart and combine back together in new ways

the molecules mix together and create new substances

the ionic compounds mix in water to form solutions

Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?

Coal is made up of more than one element

Which of the following describes a precipitate?

a solid forms when one liquid is poured into another

a liquid forms when a block of metal is heated

a gas forms when a solid is placed in a liquid

bubbles form when an acid is poured on a rock

Why are chemical equations always balanced? Select ALL that apply.

Matter can only be rearranged/conserved.

Products will form faster if____________

concentration of the reactants are increased.

the particle size of the reactants are larger.

Ch. 4 Chemical Reactions Test Quiz

42 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What type of reaction is below?
Cu₂O + K --> K₂O + Cu

Combination/Synthesis

Decomposition

Double Replacement

Combustion

Single Replacement

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What type of reaction is below?
H₂O --> H₂ + O₂

Combination/Synthesis

Decomposition

Single Replacement

Double Replacement

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What type of reaction is below?
Mg(NO₃)₂ + Na₂O --> NaNO₃ + MgO

Combination/Synthesis

Single Replacement

Double Replacement

Combustion

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Balance the following reaction: _Na + _O₂ --> ___Na₂O

4Na, 2O₂, 3Na₂O

2Na, 2O₂, 3Na₂O

4Na, O₂, 2Na₂O

1Na, O₂, 2Na₂O

Tags

NGSS.MS-PS1-5

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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

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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

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

___Cu + O₂ --> 2Cu₂O

What type of reaction is below?
Cu₂O + K --> K₂O + Cu

What type of reaction is below?
H₂O --> H₂ + O₂

What type of reaction is below?
Mg(NO₃)₂ + Na₂O --> NaNO₃ + MgO

Balance the following reaction: _Na + _O₂ --> ___Na₂O

In this reaction, how many oxygens are there on each side?
Al(NO₃)₃ + 3Na --> 3NaNO₃ + Al

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

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

What types of reactions absorb and release heat?

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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

Which coefficient must go in the missing spot to balance the chemical equation?___Cu + O2 --> 2Cu2O

What type of reaction is below? Cu2O + K --> K2O + Cu

What type of reaction is below? H2O --> H2 + O2

What type of reaction is below? Mg(NO3)2 + Na2O --> NaNO3 + MgO

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

In this reaction, how many oxygens are there on each side?Al(NO3)3 + 3Na --> 3NaNO3 + Al

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

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

What types of reactions absorb and release heat?

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Is this reaction balanced? If not, select the choice that best explains why it is not balanced.
Mg(NO₃)₂ + 2Na --> 2NaNO₃ + Mg

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

___Cu + O₂ --> 2Cu₂O

What type of reaction is below?
Cu₂O + K --> K₂O + Cu

What type of reaction is below?
H₂O --> H₂ + O₂

What type of reaction is below?
Mg(NO₃)₂ + Na₂O --> NaNO₃ + MgO

Balance the following reaction: _Na + _O₂ --> ___Na₂O

In this reaction, how many oxygens are there on each side?
Al(NO₃)₃ + 3Na --> 3NaNO₃ + Al