8th Grade EOG Science questions Review

A mixture of two or more substances that is not uniform in composition.

• Homogeneous

• Heterogeneous

• Pure Substance

• Mixture

The smallest particle of matter.

• Atom

• Matter

• Metal

• Solute

Substance that forms when two or more types of atom join?

• element

• compound

• composite

• mixture

In a chemical reaction ion oxide contains 8 atoms of iron (Fe) in the product, how many atoms of iron would be in the reactant?

• 8 atoms of iron (Fe)

• 12 atoms of iron (Fe)

• 4 atoms of iron (Fe)

• 2 atoms of iron (Fe)

In a chemical reaction ion oxide contains 4 atoms of iron (Fe) in the product, how many atoms of iron would be in the reactant?

• 8 atoms of iron (Fe)

• 12 atoms of iron (Fe)

• 4 atoms of iron (Fe)

• 2 atoms of iron (Fe)

Which is the best example of a mixture?

• a brick of pure gold

• the distilled water in a bottle

• the salt in the ocean

• the helium in a balloon

Which action causes a chemical change?

• boiling water

• crushing ice

• sifting flour

• cooking eggs

Which best describes a chemical change?

• a chemical change requires no change in energy

• a chemical change is easily reversed

• a chemical change, there is only change in state

• a chemical change, a new substance with different properties is form

Which is the best illustration for the law of conservation of mass?

• each type of molecule in a balanced equation is balanced on both sides

• each type of atom in a balanced equation is balanced on both sides

• the mass of the products in the chemical reaction is greater than that of the reactants

• the mass of the reactants in the chemical reaction is greater than the product.

The atomic number for Oxygen (O) is 8. How many protons does one Oxygen atom contain?

• 16 protons

• 8 protons

• 4 protons

• 12 protons