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Chapter 4 Chemical Reactions

Authored by Acalees Delgado

Physics

6th - 8th Grade

Used 5+ times

Chapter 4 Chemical Reactions
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20 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Chemistry is

a characteristic of a substance that can be observed without changing the substance into another substance.

the study of matter and how matter changes.

anything that has mass and takes up space.

a rapid reaction between oxygen and a substance called a fuel.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The only sure evidence for a chemical reaction is

the formation of a gas.

a color change

the production of one or more new substances

changes in properties

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A material used to decrease the rate of a chemical reaction is a(n)

inhibitor

catalyst

enzyme

fuel

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

CaCO3 represents a chemical

symbol

formula

subscript

reaction

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which is the correct chemical equation for the following statement? Sodium reacts with oxygen in a 2 to 1 ratio to produce sodium oxide.

4 Na + O2 = 2 Na2O

2 Na + O2 = 2 NaO

Na2O + O2 = 2 NaO

Na2 + O2 = Na2O2

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The principle of conservation of mass is true

only for reactions that take place in open systems

only for reactions that take place in closed systems

for reactions in both open and closed systems

for no reactions at all

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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

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