Chemistry Review

an atom with atomic number 6 would have how many protons 

• 6

• 12

• 3

• cannot be determined 

Tags

NGSS.MS-PS1-1

What does the 1.00794 stand for?

• mass number

• atomic number

• average atomic mass

• number of protons

If an atom has 12 protons, which of the following must it also have to be considered a neutral atom?

• 12 neutrons

• 12 electrons

• 12 protons

• 24 protons and neutrons

What charge does an atom have when it GAINS electrons?

• Positive

• Negative

• Neutral

What two particles determine the mass number?

• Protons and electrons

• Electrons and neutrons

• Protons and neutrons

When an atom loses an electron, it becomes a(n) _____________ ion.

• positive

• negative

• neutral

• polyatomic

What is the atomic number of this atom shown in the Bohr model?

• 11

• 12

• 13

• can't be determined

Tags

NGSS.MS-PS1-1

Which of the following is a sign that a chemical reaction has occurred?

• change in shape

• melting

• formation of a gas

• dissolving

Tags

NGSS.MS-PS1-2

A clear liquid from a flask is poured into another clear liquid in a beaker. Which of the following results of this procedure would indicate a new substance was formed?

• The level of the substance in the beaker is higher after the other liquid is added.

• A yellow solid forms and then settles to the bottom of the beaker.

• Small white crystals are left behind in the flask that held the first liquid.

Tags

NGSS.MS-PS1-2

Which of the following is an example that includes evidence of a chemical reaction?

• A sample of zinc is placed in water and it settles to the bottom

• A solid block of ice is heated and it completely melts into a liquid. 

• Sugar that is burned gives off an odor and turns brown and then black.

• A tomato is placed into a blender and chopped up into smaller pieces.

Tags

NGSS.MS-PS1-2