NAME ______________________________________________________
BLOCK ___________________________
8th Grade Science – Ms. Ball
EOG Review Homework - Week 34
Assigned: Tuesday, May 12, 2015
Due: Friday, May 15, 2015
TUESDAY: Atoms, Elements, Compounds, & Mixtures (worth 33 percent)
True or False: Identify if the following statements are true or false.
1. __________________: Atoms are smallest form of matter.
2. __________________: Electrons are located in the nucleus of an atom.
3. __________________: When two or more elements combine chemically you get a mixture.
4. __________________: The properties of elements do not change when mixtures are formed.
5. __________________: Particles in a solid are not packed at all.
6. __________________: Solids keep their shape.
7. __________________: Liquids have a definite volume and take the shape of their container.
Multiple Choice: Select the correct answer then explain HOW you knew that answer was CORRECT.
8. What makes an atom’s charge electrically neutral?
a. subatomic particles have no charge
b. atoms contain only neutrons, which have no charge
c. the number of negative electrons equals the number of positive protons
d. atoms are not neutral
How do you know? ______________________________________________________________________
9. Which pure substance is composed of only one element?
a. Water
b. Oxygen
c. Salt
d. Carbon Dioxide
How do you know? ______________________________________________________________________
10. Which of the following is correctly arranged in going from simplest to most complex?
a. Compound  Element  Atom  Mixture
b. Atom  Element  Compound  Mixture
c. Atom  Mixture Compound  Element
d. Element  Atom  Mixture  Compound
How do you know? ______________________________________________________________________
11. In the boxes below, draw what the particles look like in each state of matter and label them! (3 points)
Metals
Non-Metals
WEDNESDAY: Periodic Table (worth 33 percent)
Metalloids
Stable
Reactive
Groups
Periods
1. _____________________ are mostly gases, not very dense, and are good insulators because they do NOT allow
heat or electricity to travel through them.
2. The noble gas family is the most ___________________ group because they have 8 valence electrons and do not
easily react with other elements.
3. The horizontal rows on the periodic table are called _________________________.
4. ______________________ have properties of both metals and non-metals and located on the staircase.
5. Groups 1, 2, and 17 are the most _____________________ groups.
6. The vertical columns on the periodic table are called _________________________.
7. ______________________ are mostly shiny, solid, and good conductors located on the left side of the staircase.
Fill in the following spaces based on the elements given below (10 points)
12
4
Mg
Magnesium
Be
Beryllium
24.305
9.012
Atomic #:______________
Atomic Mass: __________
# protons:______________
# neutrons:_____________
# electrons:_____________
Atomic #:_____________
Atomic Mass:__________
# protons:_____________
# neutrons:____________
# electrons:____________
8. Name 3 properties of metals:
________________________________________________________________________________________________
________________________________________________________________________________________________
9. Name 3 properties of non-metals:
________________________________________________________________________________________________
________________________________________________________________________________________________
10. Describe metalloids. What characteristics do they have? Where are they found on the PT?
________________________________________________________________________________________________
________________________________________________________________________________________________
11. Name ONE of the most reactive groups and explain why that group is one of the most reactive.
________________________________________________________________________________________________
________________________________________________________________________________________________
THURSDAY: Properties & Changes (worth 33 percent)
19. Calculate the densities of the following substances then determine if they will sink or float in water (Recall: the
density of water = 1.00 g/mL).
a. Mass = 9 g; Volume = 3 mL; Density = _________________ Sink or float? __________________________
b. Mass = 2 g; Volume = 4 mL; Density = _________________ Sink or float? __________________________
Mass = 12 g; Volume = 2 mL; Density = _________________ Sink or float? __________________________
20. Ms. Ball loves to make lemonade during the summer months using Country Time Lemonade Mix and ice cold
water.
a. Is this an example of heterogeneous or a homogeneous mixture? _______________________________
b. How do you know? _____________________________________________________________________
c. Identify the solute: _____________________________________________________________________
d. Identify the solvent: ____________________________________________________________________
1. List the 4 signs of a chemical change:
1. __________________________________________
2. __________________________________________
3. __________________________________________
4. __________________________________________
2. Match the vocabulary word with the appropriate definition below:
Reactant
A. A substance produced during a chemical reaction
Product
Chemical Equation
Coefficient
B. Describes the chemical reaction using chemical formulas,
subscripts, and coefficients.
C. A substance that is present at the beginning of a chemical
reaction.
D. A number written before a chemical formula to show how
many atoms or molecules are involved in the reaction.