Science Chemistry Assessment 8th Grade

The pH of a nearby stream is tested and found to be basic.

What pH could be a valid result from the testing of the stream?

Which mixture can be classified as a solution?

A.
air

B.
fruit salad

C.
H2O

D.
liquid nitrogen

How many total atoms are found in one molecule of H2O?

Which method of separation can be used for a heterogeneous mixture?

A.
by distillation

B.
by densities

C.
by chromatography

D.
by acidification

What only happens during a chemical reaction?

What describes a process where a precipitate is formed?

A.
A solution of AgNO3 is added to a solution of CaCl2 to produce solid AgCl and a solution of CaNO3.

B.
Propane gas combusts to form CO2 and H2O.

C.
A solution of HCl mixes with a solution of Ca(OH)2 to produce H2O and CaCl2.

D.
A solution of H2SO4 mixes with a solution of NaOH to produce water and Na2SO4.

Which chemical equation describes the balanced reaction between magnesium and hydrochloric acid to form magnesium chloride and hydrogen gas?

What are the reactants in a cellular respiration?

What are the products in a cellular respiration?

What is the properly balanced equation that shows the synthesis of limewater, Ca(OH)2, from calcium oxide and water?

What is the base of a Ph scale?

What is the correct formula for hydrogen gas?

What is the solutes in a simple mixture?

What is the solvent in a simple mixture?

Is the equation
KMnO4 + HCl → KCl + MnCl2 + H2O + Cl2
balanced or not balanced? Explain.

What is an ionic bond?

What is a covalent bond?

What is the difference between a covalent and an ionic bond?

What is a homogeneous mixture?

What is a heterogeneous mixture?