What types of reactions absorb and release heat?

endothermic and heat transfusion

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

Which is an example of a physical change?

using sand and water to build a sand castle on a beach

a copper ring turns white and green

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

A chemical change is different than a physical change because in a chemical change

a new substance is formed and in a physical no new substance is formed

molecules do not physically touch

the change can be seen but in a physical change it cannot

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

Matter can only be rearranged/conserved.

What does it mean for a reaction to be endothermic? Choose 2 of the following.

When two substances react, the temperature of the mixture decreases.

There is less energy stored in the bonds holding the reactants together than is stored in the bonds holding the products together.

When two substances react, the temperature of the mixture increases.

There is more energy stored in the bonds holding the reactants together than is stored in the bonds holding the products together.

The amount of energy entering and leaving is the same.

What does it mean for a reaction to be exothermic? Choose 2 of the following.

When two substances react, the temperature of the mixture increases.

More energy is released by breaking the bonds of the reactants than is needed to form the bonds of the products.

When two substances react, the temperature of the mixture decreases.

Less energy is released by breaking the bonds of the reactants than is needed to form the bonds of the products.

The amount of energy entering and leaving is the same.

Is this chemical equation balanced? Why or why not? Choose the BEST answer.

No, none of the elements (carbon, hydrogen, or oxygen) are the same amount on both the reactant and product side.

Yes, the amount of atoms for each element are equal on both the reactant and product side.

No, the carbons are not the same number on both the reactant and product side.

No, neither the carbons or hydrogens are the same amount on both the reactant and product side.

Which of the following is a common sign that a chemical change has occurred?

A chemical has turned a different color, bubbled, and/or changed temperature.

A chemical has changed to a different state of matter, such as a liquid to a solid.

A chemical has become a different shape.

Chemical Reactions - Unit 3 Quiz

90 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In a ___________change, a substance changes into a different substance.

Physical

Chemical

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of these is NOT a sign that a chemical change has occurred?

A change in state

An unexpected color change

A temperature change

The formation of a precipitate

Tags

NGSS.MS-PS1-2

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In a chemical reaction, bonds are broken and new bonds are formed that create new substances. The bonds that are broken are the bonds of the_______________.

Reactants

Products

Atoms

Catalysts

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The Law of Conservation of Mass states

that matter exists in all states and reacts the same

that matter can only be changed into new substances by introducing a catalyst

that matter exists in the same state throughout any chemical change

that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants

Tags

NGSS.MS-PS1-5

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many Al atoms are represented by this chemical formula? 4Al₂O₃

2

8

6

4

Tags

NGSS.MS-PS1-1

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many F atoms are included in this chemical formula?
6MgF₂

2

6

8

12

Tags

NGSS.MS-PS1-1

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

a copper penny turning greenish after a few years.

Chemical Change

Physical Change

Tags

NGSS.MS-PS1-2

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Chemical Reactions - Unit 3

In a ___________change, a substance changes into a different substance.

Which of these is NOT a sign that a chemical change has occurred?

In a chemical reaction, bonds are broken and new bonds are formed that create new substances. The bonds that are broken are the bonds of the_______________.

The Law of Conservation of Mass states

How many Al atoms are represented by this chemical formula? 4Al₂O₃

How many F atoms are included in this chemical formula?
6MgF₂

a copper penny turning greenish after a few years.

Which of the following IS a physical change?

___________________ are the elements and compounds that leave (are formed as the result of) a chemical reaction.

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

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Chemical Reactions - Unit 3

In a ___________change, a substance changes into a different substance.

Which of these is NOT a sign that a chemical change has occurred?

In a chemical reaction, bonds are broken and new bonds are formed that create new substances. The bonds that are broken are the bonds of the_______________.

The Law of Conservation of Mass states

How many Al atoms are represented by this chemical formula? 4Al2O3

How many F atoms are included in this chemical formula?6MgF2

a copper penny turning greenish after a few years.

Which of the following IS a physical change?

___________________ are the elements and compounds that leave (are formed as the result of) a chemical reaction.

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

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How many Al atoms are represented by this chemical formula? 4Al₂O₃

How many F atoms are included in this chemical formula?
6MgF₂