Chemistry Final Exam

The positively (+) charged subatomic particle in the atom is the:

• proton

• neutron

• electron

Tags

NGSS.MS-PS1-1

Atoms with a net positive (+) or negative (-) charge are called:

• neutral

• isotopes

• ions

Tags

NGSS.MS-PS1-1

Which particles are located in the nucleus of the atom?

• neutrons & electrons

• protons & neutrons

• protons & electrons

Tags

NGSS.MS-PS1-1

Atoms with the same element with different numbers of neutrons are called:

• ions

• isotopes

• compounds

Tags

NGSS.MS-PS1-1

What is the Mass Number of an atom that has 23 protons, 27 neutrons and 18 electrons?

• 23

• 41

• 50

Tags

NGSS.MS-PS1-1

What is the molar mass of ZnF₂ ?

• 84.4 g

• 103.4 g

• 129.0 g

Tags

NGSS.MS-PS1-1

Atoms with atomic numbers greater than 20 need more __________________ to keep the nucleus stable.

• neutrons than protons

• protons than neutrons

• electrons than protons

Tags

NGSS.HS-PS1-8

6.58 kilograms is equal to how many milligrams?

• 65,000. mg

• 650. mg

• 0.00000658 mg

• 6,580,000. mg

The most important piece of safety equipment for you to wear in the lab when you work with chemicals or fire is:

• a laboratory apron

• safety goggles

• gloves

Density is equal to the mass of a substance divided by its volume. If 290 mL of a liquid has a mass of 350 grams, what is its density?

• 101,500 g/mL

• 1.21 g/mL

• 0.82 g/mL