Option C Chemistry

How many protons, neutrons, and electrons are in a neutral nitrogen atom?

• 7 protons, 14 neutrons, 7 electrons

• 7 protons, 7 neutrons, 7 electrons

• 14 protons, 7 neutrons, 7 electrons

• 7 protons, 7 neutrons, 14 electrons

Tags

NGSS.MS-PS1-1

What ion will the element Sulfur make?

• +2

• +6

• -6

• -2

Melting and Burning are very similar properties. Are they chemical or physical properties?

• Melting is chemical and burning is physical.

• They're both chemical

• Burning is chemical and melting is physical

• They're both physical

Tags

NGSS.MS-PS1-4

How many electrons fill the first 3 shells of an atom?

• 2, 8, 8

• 8, 8, 8

• 2, 8, 18

• 2, 2, 2

Tags

NGSS.MS-PS1-1

You have two unknown white substances. You know one is an ionic compound and the other is covalent. What tests could you do to determine which is which? (Choose all that apply)

• Try melting them - ionic compounds have higher melting points than covalent

• Look at them under a microscope - covalent compounds usually form crystal lattices.

• Try burning them - covalent compounds usually change the color of the flame

• Try dissolving them - ionic compounds usually dissolve better than covalent

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Why are valence electrons so important?

• Valence electrons are the closest to the nucleus

• Valence electrons are the only electrons involved in bonding

• Valence electrons are the only electrons not involved in bonding

• Valence electrons make an atom radioactive

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Why do elements bond?

• To become stable - to get 8 valence electrons

• To become stable - to get 10 valence electrons

• To become unstable - to use less energy

• To become unstable - to use more energy

Tags

NGSS.MS-PS1-1

If mercury melts at -39^oC and boils at 357^oC, what state of matter is it at room temperature? (Room temperature is 25^oC).

• Solid

• Liquid

• Gas

• Plasma

Tags

NGSS.MS-PS1-4

True or False: Elements that have the same number of valence electrons will react in the same way.

• True

• False

What compound is formed when Calcium bonds with Phosphorus?

• CaP

• CaP₂

• Ca₃P

• Ca₃P₂

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5