Chemistry Spring Final Review

Manuel measures out 36 grams of sodium on a scale. How many atoms of sodium are in his sample?

• 9.43 x 10²³ atoms

• 5.49 x 10²³ atoms

• 7.02 x 10²³ atoms

• 6.02 x 10²³ atoms

Tags

NGSS.HS-PS1-7

What is the percent composition of magnesium in MgCl₂?

• 25.5 %

• 33.3%

• 40.6%

• 66.7%

Is ZnCl₂ soluble or insoluble?

• soluble

• insoluble

Tags

NGSS.HS-PS1-1

Calculate the molarity of 5.5 moles of NaCl dissolved in 2.5 L of solution.

• 13.75 M

• 1.375 M

• 2.2 M

• 2.5 M

When 50 grams of KCl is dissolved in water at 50 ºC, the solution can be correctly described as:

• saturated

• unsaturated

• supersaturated

Tags

NGSS.HS-ESS2-5

Why is water considered polar?

• it is the universal solvent

• it makes ionic bonds

• unequal sharing of electrons results in a partial charge

• equal sharing of electrons results in a neutral charge

Tags

NGSS.HS-ESS2-5

Arrhenius defines an acid as-

• substance that increases hydronium concentration when dissolved in water

• substance that increases hydroxide concentration when dissolved in water

• donates protons

• accepts protons

Calculate the pH of a solution if [OH-]= 1 x10^-4

• 1

• 4

• 10

• 9

Calculate the pH of a solution if [H₃O⁺]= 1 x10^-7

• 8

• 7

• 11

• 9

Victoria has an unknown substance in a beaker. She wants to determine the relative pH of the unknown substance. She places a piece of red litmus paper into the substance, and the litmus paper turns blue. The substance in the beaker-

• is an acid

• is a base

• is neutral

• cannot be determined