Free Printable Chemistry Review Part 1

1.

The atomic number of an element is determined by the number of

a)

neutrons

b)

protons and neutrons

c)

protons

d)

electrons

2.

There are over one hundred known elements that exist in the universe. These elements are organized from left to right on the periodic table in order of increasing atomic number, and they are organized into columns based on similarities in their characteristic properties.

Which group contains the most reactive metals?

a)

Group 3

b)

Group 18

c)

Group 17

d)

Group 1

3.

Which of the following is an example of a ball of clay undergoing a physical change?

I. The ball is thrown into the air.

II. The ball is broken into two separate halves.

III. The ball is rolled along the ground.

IV. The ball is flattened into a pancake like shape.

a)

IV only

b)

I and III only

c)

II and IV only

d)

I, II, and III only

4.

An engineer pours hot, liquid metal into a mold. As it cools, it takes the form of a solid beam.

In the process described above, what is the evidence that a physical change occurred?

I. The liquid metal cooled to form a solid.

II. The shape of the metal changed.

III. The metal changed into new substances.

a)

I, II, and III

b)

I and II only

c)

II only

d)

III only

5.

Ethanol is a pure substance that has a melting point of -114°C and a boiling point of 78.4°C. A sample of ethanol is slowly heated from 20°C to 85°C. Which of the following is true about the ethanol as it is being heated?

a)

It changes from a liquid to a gas, and its chemical properties change.

b)

It changes from a liquid to a gas, but its chemical properties do not change.

c)

It changes from a gas to a liquid, but its chemical properties do not change.

d)

It changes from a gas to a liquid, and its chemical properties change.

6.

Which of the following determines the identity of an element?

a)

the location of the electrons in each atom of the element

b)

the number of protons in each atom of an element

c)

the number of electrons in each atom of an element

d)

the location of the protons in each atom of the element

7.

A chemist who studies water samples did a demonstration of how to test for lead in water. She added a clear solution of potassium iodide to a clear solution of lead nitrate. Then a yellow swirling solid formed in the liquid.

What is most likely true about the yellow solid?

a)

It is a new substance with different properties

b)

It is solid potassium iodide.

c)

It is solid lead nitrate.

d)

It was secretly added to the test tube by the scientist.

8.

Which element on the periodic table contains 13 protons?

a)

copper

b)

aluminum

c)

sodium

d)

boron

9.

The majority of the elements on the periodic table are _______.

a)

gases

b)

metals

c)

liquids

d)

nonmetals

10.

As part of a science experiment, Jose did a test for starch on a slice of apple and a slice of potato. The yellow-orange iodine solution stayed the same color when it was put on the apple, but it became black on the potato.

Why did the iodine solution change color on the potato?

a)

The iodine evaporated into a gas.

b)

The iodine reacted with the potato to form a new substance.

c)

The iodine mixed with the colors of the potato so it looked black.

d)

The iodine burned the potato and turned it to ash.

11.

24 grams of magnesium metal reacts with 16 grams of oxygen gas to form magnesium oxide. According to the law of conservation of mass, how much magnesium oxide will there be after the chemical change is complete?

a)

24 g

b)

30 g

c)

16 g

d)

40 g

12.

The air we breathe contains different individual gases (mostly nitrogen and oxygen). Which of the following correctly describes the air we breathe?

a)

compound

b)

mixture

c)

liquid

d)

element

13.

One molecule of nitrogen has two nitrogen atoms, and one molecule of hydrogen has two hydrogen atoms. When one molecule of nitrogen reacts with three molecules of hydrogen, how many total atoms of hydrogen are in the product?

a)

four

b)

six

c)

eight

d)

two

14.

The diagram shows a portion of the periodic table of the elements with nitrogen magnified in size. What is nitrogen's atomic number?

a)

14.0067

b)

N

c)

7

d)

5A

15.

The spheres in the diagrams below represent atoms. Spheres that are the same color are the same kind of atom. Which of the substances in the diagrams is an element?

a)

#1 only

b)

#1 and #3

c)

#2 only

d)

#1, #2, and #3

16.

Which of the following is a compound?

a)

silver (Ag)

b)

sodium chloride (NaCl)

c)

oxygen (O2)

d)

potassium (K)

17.

In a chemical reaction, the products are

a)

the new substances that are formed during the reaction.

b)

the number of atoms of each chemical present in the reaction.

c)

the substances that are broken apart or combined in the reaction.

d)

all of the chemical formulas that are used during the reaction.

18.

The table lists some elements and their properties. Which element is in the same group as element X?

a)

sodium

b)

bromine

c)

krypton

d)

magnesium

19.

Which of the following definitions characterizes an element?

a)

contains only one type of atom

b)

can be separated through physical means

c)

can only be broken down by chemical means

d)

contains a basic combination of two or more substances

20.

A cube of sodium chloride—which is table salt—is soluble in water. A _______ property of salt is that it will _______ in water.

a)

chemical; dissolve

b)

chemical; sink

c)

physical; corrode

d)

physical; dissolve

21.

Within an atom, electrons

a)

are in motion outside the nucleus.

b)

are outside the nucleus and are motionless.

c)

are in motion inside the nucleus.

d)

are inside the nucleus and are motionless.

22.

When salt is dissolved in water, the result is a

a)

heterogeneous mixture

b)

homogeneous mixture

c)

compound

d)

gas

23.

What atoms are present in the molecule calcium carbonate (CaCO3)?

a)

one calcium atom, one carbon atom, and three oxygen atoms

b)

one calcium atom, one carbon atom, and two oxygen atoms

c)

one calcium atom and three carbon atoms

d)

two calcium atoms, two carbon atoms, and three hydrogen atom

24.

In a _______ mixture, the ingredients are distributed evenly throughout the mixture, while in a _______ mixture, the ingredients are unevenly distributed throughout.

a)

heterogeneous; homogeneous

b)

homozygous; heterozygous

c)

heterozygous; homozygous

d)

homogeneous; heterogeneous

25.

Rubbing alcohol or isopropanol can be described by the chemical formula C3H7OH. One milliliter of isopropanol has a mass of 0.76 g, so its density is 0.76 g/mL. Isopropanol is often used as a cleaner or a disinfectant and evaporates when placed on warm objects. However, caution must be taken when using isopropanol, because it is also highly flammable.

Which of the following is a chemical property of isopropanol?

a)

Isopropanol has a density of 0.76 g/mL.

b)

One mL of isopropanol has a mass of 0.76 g.

c)

Isopropanol is flammable.

d)

Isopropanol evaporates when placed on a warm object.

26.

The periodic table of elements is shown. Which of the following elements are nonmetals?

a)

nitrogen (N) and sulfur (S)

b)

lithium (Li) and barium (Ba)

c)

beryllium (Be) and magnesium (Mg)

d)

palladium (Pd) and zinc (Zn)

27.

Look at the Periodic Table shown. Which of the following elements have both metallic and nonmetallic properties?

a)

Nitrogen (N), atomic number 7

b)

Zinc (Zn), atomic number 30

c)

Silicon (Si), atomic number 14

d)

Calcium (Ca), atomic number 20

Chemistry Review Part 1

Total questions: 27

Worksheet time: 17mins

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