Quiz about Chemistry Unit Review

Question 1

What is the smallest unit of an element that retains the properties of that element?

Accepted Answer

atom

Answer

electron

Answer

molecule

Answer

neutron

Question 2

A student passes a magnet over 10 grams of a powder. Four grams of the powder stick to the

magnet, while 6 grams do not. Which of these identifies the substance?

Accepted Answer

mixture

Answer

element

Answer

compound

Answer

solution

Question 3

Sodium chloride (NaCl) is formed in a chemical reaction between sodium (Na) and chlorine (Cl₂). What is sodium chloride?

Accepted Answer

compound

Answer

element

Answer

mixture

Answer

atom

Question 4

Which of these are broken down during chemical, but not physical, changes?

Accepted Answer

compounds

Answer

elements

Answer

mixtures

Answer

solutions

Question 5

Structural differences between different chemicals can be represented in models of the

particles. Which drawing BEST represents a compound?

Accepted Answer

A

Answer

B

Answer

C

Answer

D

Question 6

Which type of matter can be separated by physical means?

Accepted Answer

mixture

Answer

atom

Answer

element

Answer

compound

Question 7

Which of the following is an example of a compound?

Accepted Answer

water

Answer

copper

Answer

iron

Answer

carbon

Question 8

A student studies four chemicals in a laboratory investigation. Which chemical cannot be further broken down into other chemicals using ordinary

laboratory processes?

Accepted Answer

3

Answer

1

Answer

2

Answer

4

Question 9

Which element has 7 valence electrons?

Accepted Answer

fluorine (F)

Answer

hydrogen (H)

Answer

lead (Pb)

Answer

gold (Au)

Question 10

What do the atomic numbers represent?

Accepted Answer

protons

Answer

neutrons

Answer

atoms

Answer

nucleus

Question 11

What physical property is characteristic of all of the elements in the group located in the rightmost column of the periodic table?

Accepted Answer

gas state at room temperature

Answer

very high melting point

Answer

good conductor of electric current

Answer

extremely brittle solid at room temperature

Question 12

Which pair of elements has the most similar properties?

Accepted Answer

N and P

Answer

Li and B

Answer

I and Ca

Answer

K and He

Question 13

Which characteristic of an element determines its placement in the periodic table?

Accepted Answer

number of protons

Answer

mass

Answer

size

Answer

number of neutrons

Question 14

Which element would best be described as a brittle, non-conductive solid?

Accepted Answer

sulfur (S)

Answer

calcium (Ca)

Answer

sodium (Na)

Answer

thorium (Th)

Question 15

Where are the most reactive metals located on the periodic table?

Accepted Answer

the column at the far left side of the table

Answer

the uppermost complete row of the table

Answer

the rows at the bottom of the table connecting two section

Answer

the second column from the right side of the table

Question 16

What is the significance of metalloids in the periodic table?

Accepted Answer

They separate metals from nonmetals.

Answer

They separate liquids from solids.

Answer

They combine elements and compounds.

Answer

They separate synthetic from natural elements

Question 17

Which task in the kitchen is an example of a physical change?

Accepted Answer

melting butter

Answer

frying an egg

Answer

baking a cake

Answer

burning toast

Question 18

As part of a study, a scientist observed a number of different molecular changes in matter. Which of the following observations provides evidence of a physical change?

Accepted Answer

a bottle that was broken into many small pieces

Answer

using heat to burn a log in a fireplace

Answer

using light to produce sugar in plants

Answer

a cake that was baked from many ingredients

Question 19

A chemist observed bubbling and fizzing after adding an acid solution to a white powdery substance in a beaker. Which of the following can be inferred?

Accepted Answer

The acid and powder formed a new product.

Answer

The acid boiled when poured into the beaker.

Answer

A physical reaction produced a gas mixture.

Answer

A reaction occurred that produced heat.

Question 20

During photosynthesis, carbon dioxide and water combine according to the general equation in the picture. Why is photosynthesis a chemical reaction?

Accepted Answer

because new substances are formed

Answer

because an input of energy is required

Answer

because the reactants are compounds

Answer

because the products include an element

Question 21

A scientist placed a sample of lithium into a container of water. The scientist observed the lithium floating and making a buzzing sound as gas bubbles were forming around it. Which conclusion is BEST supported by this observation?

Accepted Answer

A chemical change took place.

Answer

The lithium was dissolved by the water.

Answer

Dissolved gases were released.

Answer

Water was vaporized.

Question 22

Sodium sulfate and barium chloride react with each other to form sodium chloride and barium sulfate as shown.

Which statement MOST accurately describes the mass of the reactants compared to the mass of the products?

Accepted Answer

The mass of the reactants is the same as the mass of the products.

Answer

The products have a greater mass because matter was created during the reaction.

Answer

The reactants have a greater mass because some of the mass was converted to heat.

Answer

The reactants have a greater mass because some matter was destroyed by the reaction.

Question 23

Using a closed system, a student heats 100 milliliters (mL) of distilled water in a flask. The steam from the water is captured, cooled, and condensed as shown in the diagram.

How much water is MOST likely collected?

Accepted Answer

100 mL

Answer

1 mL

Answer

10 mL

Answer

110 mL

Question 24

If a chemical reaction such as photosynthesis begins with 6 atoms of carbon (C), how many atoms of carbon (C) should be in the products?

Accepted Answer

6 atoms of carbon (C)

Answer

12 atoms of carbon (C)

Answer

3 atoms of carbon (C)

Answer

2 atoms of carbon (C)

Question 25

What is the pH range for an acid?

Accepted Answer

less than 7.0

Answer

greater than 7.0

Answer

7.0 exactly

Answer

1.0 - 8.0

Question 26

What is the pH range for bases?

Accepted Answer

greater than 7.0

Answer

less than 7.0

Answer

7.0 exactly

Answer

1.0 -8.0

Chemistry Unit Review

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