8th Grade Unit 2 Review

Molecular Motion

100

What is the process that changes a gas to a liquid

Condensation

200

For liquid water to change to steam (gas), heat energy must be added or removed?

added

300

Which process changes matter from a solid to a gas, but skips the liquid phase?

sublimation

400

The process of changing from a gas to a solid, but skipping the liquid phase is called ______.

deposition

500

A scientist combines two liquid substances and observes that a solid forms. What has occured?

A Chemical Reaction

Subatomic Particles and other things

100

Which 2 subatomic particles are found in the nucleus?

protons and neutrons

200

Which subatomic particle orbits the nucleus?

Electrons

300

How many elements are in HHe?

2

400

 What coefficient should be used to make the following equation balanced?
N2+O2--> _NO

2

500

Balance this equation

_Al +_HCl --> _H2 +_AlCl3

2,6,3,2

Periodic Table

100

Atomic number tells you how many __________ or _________are in an atom

protons and electrons

200

The modern periodic table is organized by atomic___________. Menedeleev's periodic table was organized by ____________/

atomic number atomic mass/mass number

300

Name 3 ways the periodic table is organized

-Metals, metalloids, nonmetals. -Atomic number -Atomic Mass -Valence Electrons -similar properties

400

Which elements are found on the right side of the Periodic Table?

nonmetals

500

 How many elements are in C6H12O6? Assume numbers are subscript.

3

Name That Element! and other things

100

Atomic Number 33

Arsenic

200

27 protons, 27 electrons, 32 neutrons

Cobalt

300

74 protons, 74 electrons

Tungsten

400

Silicon is a semiconductor and has properties of both metals and non-metals. What type of element is silicon?

Metalloid

500

Which equation is balanced? 

PbO2 + 2H2 

SO2 + H20 --> H2SO4 

2Na + 2H2O --> 2NaOH + H2

2Na + 2H2O --> 2NaOH + H2

Atoms!!

100

How many Magnesium atoms are in 10MgCl2?

10

200

How many atoms are there TOTAL in H2SO4 ?

7

300

 What is the total number of atoms present in 5Na3PO4?

40

400

Which number should go in the blank?
Al(NO3)3 + _  NaOH -> Al(OH)3 + 3 NaNO3 

1,2,3,0

3

500

What are the coefficients that would properly balance this equation?

__Ca + __H2O --> __Ca(OH)2 + __H2

1,2 --> 1,1