Review sheet 6th grade 9 Week CCA

  1. What are the signs that a chemical reaction has taken place?

A)New substance formed

B)Permanent color change

C)Precipitate formed

D)Bubbles or gas released

E)Release of energy

It cannot go back to what it was before.

  1. When does a precipitate occur? When two liquids are mixed together and a solid is formed.
  2. What are the signs that a physical change has taken place?

Only a change of state (solid, liquid, to gas) (like boiling water or freezing water)

Change of shape

The item has not changed to something else

Color change

  1. What are the characteristics of a metal?

A)shiny

B)malleable/ductile

C)good conductors of electricity

D)Group one most reactive

E)solid

  1. Where are metals located on the periodic table?To the left of the zig zag
  2. Are metals mostly solid or liquid?solid
  3. What is the definition of malleable?Able to be hammered into sheets

8. What is the definition of ductile? Can be pulled into a wire

  1. What does electrical conductivity mean?Can conduct electricity
  2. What is luster? How shiny something is
  3. What is streak? The color produced when a mineral is scratched on a tile.

12. What are the characteristics of a nonmetal?

  1. dull
  2. not malleable or ductile
  3. mostly gases
  4. Group 18 noble gases, most stable

13.Where are nonmetals located on the periodic table? Right of the zig zag

14. Are nonmetals mostly solid or liquid or gases? gas

15. What are the characteristics of a metalloid? Have properties of both metals and nonmetals.

  1. Where are metalloids located on the periodic table? On the zig zag

17. Which group contains elements that are semiconductors?metalloids

  1. What is the formula for density? D= m/v

19. Which tools would you use to take density?

Ruler, scale or triple beam balance, graduated cylinder

  1. What are the units for density?

a. g/cm3

b. g/ml

  1. What is the density for a substance that has a mass of 50 grams and a volume of 200ml. Remember to add the proper units.

D= 50g/200ml= .25 g/ml

  1. How do you take the volume of an irregular object?

Water displacement method. Drop the object into a known volume then take that number and subtract by the initial volume. Final 80ml- initial 70ml = 10ml

  1. If you dropped a rock into 50ml of water and it went up to 61ml. What would be the volume of the rock? 61ml-50ml=11ml
  1. What is the density for a substance that has a mass of 40 grams and a volume of 4mL? Add proper units.

D= 40g/4ml= 10g/ml

25. What is the density of a substance that has a mass of 50 grams and a volume of 50cm3? Remember units.

D= 50g/50cm3= 1g/cm3

26. On the Moh’s scale of hardness, what number would be considered the softest? __1____. What about the hardest? ____10______

  1. Put these in order of most dense to less dense:

1.5, 2.8, 1.2, 4.5, 13.2, 18.9, 0.5, 5.0, 8.7

18.9, 13.2, 8.7, 5.0, 4.5, 2.8, 1.5, 1.2, 0.5

28.Circle which of the following is a physical property:

Color, density, burning, boiling point

29.Circle which of the following is a chemical property:

Burning, reacting violently with water, shiny, melting

30.What are the properties of minerals?

Solid, naturally occurring, inorganic, definite chemical composition, crystal structure

Ranked according to color, luster, streak, density, cleavage, fracture, phosphorescence, magnetism, Moh’s hardness scale