Question 1

What is the best definition of an element?

Accepted Answer

Contains only one type of atom

Answer

Is made of two or more types of atoms

Answer

Is the smallest unit of matter

Answer

Makes up all living things

Question 2

What is the best definition of a mixture?

Accepted Answer

It can be separated using physical means

Answer

It contains only one type of atom

Answer

It can only be separated using a chemical reaction

Answer

It is a pure substance

Question 3

Which of these answers does not describe metals?

Accepted Answer

Brittle

Answer

Conductive

Answer

Luster

Answer

Ductile

Question 4

Which of the following does not describe a non-metal?

Accepted Answer

Malleable

Answer

Non-conductive

Answer

Dull

Answer

Brittle

Question 5

Lithium, atomic number 3, abbreviation Li is very explosive.  Which other element has the best chance of also being explosive?

Accepted Answer

Rubidium, atomic number 37, abbreviation Rb

Answer

Carbon, atomic number 6, abbreviation C

Answer

Titanium, atomic number 22, abbreviation Ti

Answer

Uranium, atomic number 92, abbreviation U

Question 6

On the periodic table, metals are located

Accepted Answer

Left and center

Answer

Center

Answer

Left

Answer

Right and Center

Question 7

How is the periodic table organized?

Accepted Answer

By chemical properties

Answer

By the number of electrons

Answer

Alphabetically

Answer

By the atomic mass

Question 8

The water that we get out of our sinks contains different solids and liquids.  Which of the following describes tap water?

Accepted Answer

Mixture

Answer

Colloid

Answer

Element

Answer

Compound

Question 9

Which of the following describes an acid?

Accepted Answer

pH 0-6.9

Answer

Bitter

Answer

pH 7.1-14

Answer

Slippery

Question 10

Choose the substance that is most acidic.

Accepted Answer

Stomach acid: pH1

Answer

Drain cleaner: pH 13

Answer

Milk: pH 6

Answer

Ammonia: pH 11

Question 11

Choose the substance that is the most basic.

Accepted Answer

Ammonia: pH 11

Answer

Baking soda: pH 9

Answer

Vinegar pH: 3

Answer

Rainwater: pH 5

Question 12

Which of the substances below is an example of a neutral substance?

Accepted Answer

Pure water: pH 7

Answer

Pure water: pH 0

Answer

Lye: pH 14

Answer

Egg whites: pH 8

Question 13

Ms. Welch uses pH paper to test the pH of a substance.  This is the result.  What should Ms. Welch do next to determine the pH?

Accepted Answer

Match the color of the pH paper to the color scale on the package.

Answer

Use a digital pH meter to get a more exact measurement.

Answer

Use a ruler to see how far the liquid traveled on the pH strip.

Answer

The paper didn't change color.  Ms. Welch needs to retest the substance.

Question 14

The law of conservation of mass tells us

Accepted Answer

The same number of elements will be available before and after a reaction

Answer

The same number of molecules must be available before and after a chemical reactions

Answer

As mass increases, total matter also increases

Answer

Elements can change in a chemical reaction but the amount of matter is the same

Question 15

This is a model of a reaction that creates water.  What is wrong with this picture?

Accepted Answer

It starts with 2 red and 2 white but ends with 1 red and 2 white

Answer

Water is an element and is made out of one type of atom

Answer

Chemical bonds should only have one line not two lines.

Answer

Water cannot be created because it is a compound

Question 16

Which element below is a non-metal

Accepted Answer

Bromine, atomic number 35, symbol Br

Answer

Chromium, atomic number 24, symbol Cr

Answer

Potassium, atomic  number 19, symbol K

Answer

Neodymium, atomic number 60, symbol Nd

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