Elements, Mixtures, Compounds Test

The atomic number of an element tells you the following. Check all that apply

• Electrons

• Mass

• Neutrons

• Protons

Why is salt classified as a compound?

• It is not, it is a mixture.

• It is not, it is an element.

• It is two or more elements physically combined.

• It is two or more elements chemically bond together.

Tags

NGSS.MS-PS1-1

How do you find the number of neutrons an element has?

• Neutrons is equal to atomic mass.

• Neutrons, protons, and electrons are the same.

• Subtract atomic number from atomic mass, but leave mass and answer as a decimal.

• Substract atomic number from atomic mass, but round mass and neutrons to the nearest whole number.

If you looked on your periodic table and find a "item" by itself you know it is the following.

• element

• compound

• mixture

• you need more information.

The gray dots outside the nucleus represent what subatomic particle?

• atom

• electron

• neutron

• proton

Tags

NGSS.MS-PS1-1

Why is chicken salad classified as a mixture? List all that apply.

• It is uniform throughout.

• It can be separated by physical means.

• It is physically, but not chemically combined.

• It's characterics change when bonded together.

Use your periodic table to find the atomic number, protons and electrons of Radon (Rn).

• atomic number=86, protons=86, electrons=222

• atomic number=222, protons=86, electrons=86

• atomic number=86, protons=86, electrons=86

• atomic number=222, protons=222, electrons=86

How many molecules, how many compounds?

• one molecule, one compound

• one molecule, two compounds

• two molecules, one compound

• five molecules, two compounds

Tags

NGSS.MS-PS1-1

Where are neutrons and protons found within an atom?

• A

• B

• C

Tags

NGSS.MS-PS1-1

How many electrons can be found in each layer of the electron cloud?

• Layer 1=2, Layer 2=4, Layer 3=8, Layer 4=12

• Layer 1=2, Layer 2=8, Layer 3=16, Layer 4=24

• Layer 1=2, Layer 2=8, Layer 3=18, Layer 4=32

• Number of electrons in each layer does not matter.