Unit 2 Test Review

In which state of matter will the atoms of an element be tightly packed together?

• Solid

• Liquid

• Gas

• Plasma

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Mg(OH)2 is a compound. How many different elements are found in this compound?

• 1

• 2

• 3

• 5

Tags

NGSS.MS-PS1-1

Which of the following is the best example of a pure substance?

• peanuts

• milk

• gold

• air

Why is carbon an element and not a compound?

• All carbon atoms have the same number of protons.

• Carbon bonds easily with oxygen, but not helium.

• All carbon atoms have the same number of neutrons.

• Carbon is found in all living things.

Tags

NGSS.MS-PS1-1

Hydrogen peroxide (H2O2) and water (H2O) both contain hydrogen (H) and oxygen (O). Why are they different compounds?

• Hydrogen peroxide contains one more oxygen than water.

• Hydrogen peroxide contains one less oxygen than water.

• Hydrogen peroxide contains one more hydrogen than water.

Tags

NGSS.MS-PS1-1

Match the following terms...

• Uniform throughout the mixture

• homogenous mixture

• the phase transition from liquid to gas

• heterogenous mixture

• Not uniform throughout the mixture

• vaporization

Match the following...

• neutral-Isotopes are formed

• electron

• the negatively charged particle in atom

• neutron

• a negatively charged ion

• proton

• a positively charge ion

• cation

• give an atom its identity

• anion

Tags

NGSS.MS-PS1-1

Identify the following as either an element, compound or mixture.

Groups:

(a) Element

,

(b) Compound

,

(c) Homogenous Mixture

,

(d) Heterogenous Mixture

• Brass

• 
• Air

• 
• H2O

• Tossed salad

• O2

• 
• CO2

• 

Tags

NGSS.MS-PS1-1

The table shows the chemical formulas for several common substances.

Which two elements make up household ammonia?

• neon and helium

• neon and hydrogen

• nitrogen and helium

• nitrogen and hydrogen

Tags

NGSS.MS-PS1-1

Which statement best explains how periods on the periodic table are organized?

• increasing atomic number from left to right

• decreasing number of electrons from left to right

• decreasing atomic mass number from left to right