Quiz about Midterm Exam Review - Chemistry Unit 1

Question 1

This is an accurate model because...

Accepted Answer

It has the correct number of molecules and atoms for both sides of the equation.

Answer

It is missing one more CO₂ in the model.

Answer

Only the reactant side has the correct models for the formulas of each molecule.

Answer

None of the above

Question 2

According to the law of conservation of mass, the number of Carbon, Hydrogen, and Oxygen atoms are the same on both sides of the chemical equation above.

Accepted Answer

True

Answer

False

Question 3

How many atoms of carbon are shown on EACH side of this chemical reaction?

Accepted Answer

1

Answer

3

Answer

4

Answer

5

Question 4

If there are 4 H atoms on the reactant side, how many H atoms will be on the product side?

Accepted Answer

4

Answer

2

Answer

6

Answer

You need more information to answer this question

Question 5

The total amount of matter (atoms) before and after a chemical reaction, remains the same.

Accepted Answer

True

Answer

False

Question 6

During a chemical reaction, matter cannot be _______ or created.

Accepted Answer

destroyed

Answer

bought

Answer

changed

Answer

made

Question 7

Which of the following choices is the reactant for the equation above?

Accepted Answer

Option B is correct

Answer

A.

Answer

C.

Answer

D.

Question 8

Identify the reactant(s) and product(s) of the reaction.

Accepted Answer

Hydrogen and oxygen are the reactants, and water is the product.

Answer

All three are reactants and none are products.

Answer

Hydrogen and water are the reactants, and oxygen is the product.

Answer

Water and oxygen are the reactants, and hydrogen is the product.

Question 9

__________ are the substances present before the chemical reaction takes place.

Accepted Answer

reactants

Answer

products

Answer

elements

Answer

compound

Question 10

The _________ are the substances present after the chemical reaction takes place.

Accepted Answer

products

Answer

reactants

Answer

compound

Answer

elements

Question 11

There are 4 atoms of hydrogen in the products of the equation. How many hydrogens would you expect in the reactants?

Accepted Answer

4

Answer

1

Answer

3

Answer

5

Question 12

Which of the following models best demonstrates a balanced chemical equation?

Accepted Answer

F

Answer

G

Answer

H

Answer

J

Question 13

For an investigation a student added 100 mL of a blue solution of CuSO₄ into a beaker. The student then placed a new, shiny, silver-colored strip of zinc metal into the solution and observed the changes. The student inferred that a chemical reaction occurred. What evidence best supports this inference?

Accepted Answer

A dark solid formed on the zinc metal.

Answer

The zinc metal remained silver-colored and shiny

Answer

The CuSO₄solution stayed blue when the zinc metal was added.

Answer

None of these

Question 14

A scientist performed four investigations using eight different liquids. In each investigation, the scientist combined two of the liquids under a fume hood and recorded observations in the table below.In which investigation is it least likely that the liquids resulted in a chemical reaction?

Accepted Answer

3

Answer

1

Answer

2

Answer

4

Question 15

What evidence best supports that a chemical reaction has occurred in the picture above?

Accepted Answer

A yellow precipitate (solid) formed after 2 liquids were mixed.

Answer

It is a physical change because food dye is being added.

Answer

A precipitate (solid) formed after because steam is produced.

Answer

The temperature of liquid lowered creating a clear solid.

Question 16

Why is ice freezing ONLY a physical change?

Accepted Answer

The molecules of water do NOT change. They only slow down and vibrate in position.

Answer

The ice is colder than water.

Answer

It can stay cold when you put it in the freezer.

Answer

Its physical appearance does NOT change.

Question 17

One of the signs of a chemical reaction taking place is:

Accepted Answer

Bubbles are produced

Answer

Reactants are not combining

Answer

Color stayed the same

Answer

Temperature did not change

Question 18

One cup of water is left outside for two days when it was checked there was only half a cup left. What happened?

Accepted Answer

evaporation; physical change

Answer

evaporation; chemical change

Answer

condensation; physical change

Answer

condensation; chemical change

Question 19

Which of the following models best demonstrates the law of conservation of mass?

Accepted Answer

F

Answer

G

Answer

H

Answer

J

Question 20

Does this model of a chemical reaction accurately show that mass is conserved?

Accepted Answer

no

Answer

yes

Answer

Not enough information

Question 21

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

Accepted Answer

the same as the mass of the reactants

Answer

slightly less than the mass of the reactants

Answer

much less than the mass of the reactants

Answer

greater than the mass of the reactants

Question 22

Ms. Ferguson added 6 g of liquid wax to a cup that weighed 12 g. What is the weight of the cup after the wax solidifies?

Accepted Answer

18 g

Answer

6 g

Answer

12 g

Answer

24 g

Question 23

Kyle stirs 8 g of pineapple juice mix into 200 g of ice water. What is the mass of the new solution?

Accepted Answer

208

Answer

192

Answer

200

Answer

300

Question 24

In Elephant toothpaste, what evidence shows a chemical reaction took place?

Accepted Answer

Formation of a gas (oxygen)

Answer

Formation of a solid

Answer

Formation of carbon dioxide

Answer

Formation of a gas (nitrogen)

Question 25

Combination of two or more pure substances that are not chemically combined

Accepted Answer

mixture

Answer

compound

Answer

atom

Answer

element

Question 26

made up of one kind of matter and has a definite set of properties

Accepted Answer

pure substance

Answer

compound

Answer

atom

Answer

mixture

Question 27

What type of substance is always made up of a single type of atom?

Accepted Answer

element

Answer

compound

Answer

mixture

Answer

molecule

Question 28

According to scientific principle #6 properties (denstiy, hardness, melting point, solubility) of a substance will:

Accepted Answer

stay the same, even if the amount of the substance is different

Answer

stay the same ONLY if the amount of the substance is the same

Answer

change based on the amount of the substance present

Answer

change because it isn't possible to stay the same if the amount chagnes

Question 29

Kent found 2 wood cubes (like the ones we used in class) and wanted to know if they were made of the same type of wood. Unlike, in class the 2 cubes are different sizes. How could Kent determine if the cubes are made of the same type of wood.

Accepted Answer

calculate density for both cubes

Answer

measure the mass of both cubes

Answer

measure the length, width, and height and calculate for volume

Answer

burn the wood cubes and observe how they change

Question 30

Scientific principle #6 states: properties of a given substance are the same regardless of the amount of the substance. Based on this scientific principle, which options below will not change if the amount of a substance is increased?

Accepted Answer

melting point of the substance

Accepted Answer

solubility of the substance

Accepted Answer

density of the object

Answer

mass of the substance

Answer

volume of the substance

Question 31

What is the formula for calculating density?

Accepted Answer

D=M/V

Answer

D=V/M

Answer

D=MxV

Answer

M=D/V

Question 32

_________ is when on substance is able to dissolve in another.

Accepted Answer

solubility

Answer

phase change

Answer

substance

Answer

density

Question 33

Which of the following are signs for a chemical reaction? Click all that apply

Accepted Answer

color change

Accepted Answer

temperature change

Accepted Answer

formation of gas

Answer

phase change

Answer

mass

Question 34

A phase change IS NOT a chemical reaction. Choose the options that support this claim. You may choose more than one.

Accepted Answer

The substance are mixed together and keep their properties

Accepted Answer

The atoms and molecules are mixed together BUT do not create new molecules

Answer

The atoms making up the molecules are rearranged creating new substances

Answer

The atoms are rearranged creating a new product with a different arrangement of atoms

Question 35

How can we determine if 2 unknown substances are the same or different substance?

Accepted Answer

test properties of the substances

Answer

observe the size of each substance

Answer

observe the shape of the substances

Answer

make a hypothesis, educated guess

Midterm Exam Review - Chemistry Unit 1

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