Chemistry - 7th Grade

The atomic number of oxygen is

• 8

• 15.9994

• 16

• O

Tags

NGSS.MS-PS1-1

The atomic mass of nitrogen is

• 7

• 14.007

• 21.007

• Cannot be known from the given

The number of protons in a sulfur atom is

• 0

• 16

• 32

• None of the above answers

Tags

NGSS.MS-PS1-1

The number of electrons in a Lithium atom is

• 3

• 4

• 6

• 7

Tags

NGSS.MS-PS1-1

The number of neutrons in a Beryllium atom is

• 4

• 5

• 9

• 9.012

Tags

NGSS.MS-PS1-1

Identify the elements in this compound.

• Carbon, Helium, Oxygen

• Chromium, Hydrogen, Oxygen

• Calcium, Hydrogen, Oxygen

• Carbon, Hydrogen, Oxygen

Tags

NGSS.MS-PS1-1

The total number of atoms in this compound is

• 4

• 7

• 9

• 12

Tags

NGSS.MS-PS1-1

Evaporation is the change of state from

• Solid to liquid

• Liquid to gas

• Gas to solid

• Gas to liquid

Tags

NGSS.MS-PS1-4

The opposite phase of melting is

• Condensation

• Vaporization

• Sublimation

• Freezing

Tags

NGSS.MS-PS1-4

Which is a neutron?

• a

• b

• c

• Non of the above

Tags

NGSS.MS-PS1-1