Quick Google Questions that Review the First 1/2 of 8th Grade

If you google these questions quickly it covers 8th Grade and it will trigger other ideas.

1)    Tell me the primary reason for the formation of the Grand Canyon.

2)   What is soil made of?

3)   Tell me what erosion is.

4)   Tell me what weathering is.

5)   Tell me what deposition is.

6)   What can fossils tell you about a given area?

7)   What layer of the Earth is responsible for Earthquakes?

8)   What’s a convection current?

9)   What is seafloor spreading?

10)                Draw a diagram of the 4 Layer of the Earth.

11)                What creates the Earth’s magnetic field?

12)                What is displacement?

13)                How do you calculate the volume of a box?

14)                Give me two examples of characteristic properties of a substance.

15)                Why do some object float in liquid?

16)                What is the density formula?

A little More Chemistry :-)

A chemical element is a single element (He, N, O, etc.)

1)    A chemical compound is two or more elements together (NaCl)

2)    Small particle that makes up most types of matter on earth? ATOMS

3)    Do compounds have the same chemical properties as the elements that compose them?

No, their physical and chemical properties can be different from the constituent elements.

Example :

Sodium is a silvery, soft, light metal that combusts if it becomes wet.
Chlorine is a greenish-yellow gas that is lethal when inhaled.
The compound they form is sodium chloride, or table salt, which is stable and non-toxic.

4)    Elements in the same group, UP and Down on the periodic table will have similar properties

5)    Na + Cl à NaCl    (Na + Cl) = Reactants         (NaCl)= Product

6)    The products are usually completely different that the reactants.  For Example, Hydrogen is explosive and Oxygen is flammable, but together they put out fires.

7)    The law of conservation of mass dictates the quantity of each element does not change in a chemical reaction. Thus, each side of the chemical equation must represent the same quantity of any particular element.  CH₄ + 2 O₂ CO₂ + 2 H₂O

8)    Metals are shiny, can be bent and conduct electricity

9)    In a chemical change, the substances are altered chemically and display different physical and chemical properties after the change. When a chemical change occurs new substance(s) are formed through a reorganization of the atoms. A chemical change is irreversible.

10) In a chemical reaction, the substances you begin with are called reactantsA compound present at the beginning of a chemical reaction.. The new substances that are formed are called products A compound that is formed as a result of a chemical reaction..

11)   A base is Bitter to taste but a acid is sour

Chemistry Review

8^th grade Study Guide

Solvents dissolve other substances

A solute is the substance that is dissolved by the solvent

A solution a homogeneous mixture of two or more substances

Sugar and NaCl(salt) are both soluble in water

IRON, GOLD, Hydrogen are all pure substances

Water is a natural solvent

Metals are conductors

If you shake a solution and have a solid left at the bottom the solid is considered to be insoluble

Metals attract to magnets

Filters are used for thick materials that are insoluble

Evaporation is used to evaporate a liquid and separate out another material that will be left behind.  If you evaporate sugared water, the water evaporates and you are left with the sugar