Chemistry Unit Test Review 2022

What charge do protons have?

• Positive

• Negative

• Neutral

What is atomic number ?

• Number of Protons

• Number of Electrons

• Number of Protons and Electrons

• Number of Protons and Neutrons

Which sub-atomic particles are found in the nucleus of an atom?

• protons only

• neutrons and electrons

• protons and electrons

• protons and neutrons

What is the mass number of an atom that contains 9 protons, 10 neutrons, and 9 electrons?

• 9

• 10

• 18

• 19

Tags

NGSS.MS-PS1-1

How many electrons are in an atom with an atomic number of 50?

• 5

• 8

• 50

• 2

change in a substance that does not change its identity

• physical change 
• chemical change 

change in which one or more substances combine or break apart to form new substances  

• physical change 
• chemical change 

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is an element?

• An element is an atom and two atoms
• An element is one or more atoms of the same kind.
• An element is more than one of different kinds

Tags

NGSS.MS-PS1-1

How many atoms of Nitrogen are in this molecule?

• 3
• 2
• 0
• 1

Tags

NGSS.MS-PS1-1

Is salt (NaCI) a compound or a element

• Compound
• element

Tags

NGSS.MS-PS1-1