Chemistry Final Review Day 2

A researcher uses several procedures to separate a rock sample into different

chemicals. A mass of 50 grams of one chemical is produced. If this chemical

cannot be separated into other chemicals, then it is best described as

• a compound

• a mixture

• a solution

• an element

Decreasing the concentration of ammonia will cause the system to shift to

• left

• right

• no effect

Tags

NGSS.HS-PS1-5

Which change would cause the chemical reaction of ammonia to shift to the

left?

• adding a catalyst to the system

• removing heat from the system

• adding nitrogen (N₂) to the system

• removing hydrogen (H₂) from the system

Tags

NGSS.HS-PS1-5

Calcium carbonate (CaCO₃) is a solid substance that can be purchased as a

powder or in small solid tablets. Which statement BEST explains why a

manufacturer may decide to use powdered calcium carbonate instead of

calcium carbonate in the solid tablet form?

• The powdered calcium carbonate has less surface area, resulting in less of

  the calcium carbonate available for the reaction

• The powdered calcium carbonate has a greater surface area, resulting in

  more of the calcium carbonate available for the reaction

• The solid tablets of calcium carbonate have less surface area, resulting in

  more of the calcium carbonate available for the reaction

• The solid tabletsof calcium carbonate have a greater surface area, resulting

  in less of the calcium carbonate available for the reactionde

Tags

NGSS.HS-PS1-5

Which is the MOST LIKELY result of increasing the heat added to the chemical

reaction?

heat + CaCO₃(s) ⇔ CaO(s) + CO₂(g)

• The amount of calcium oxide produced is reduced

• Less calcium carbonate is needed to produce calcium oxide

• Calcium oxide and carbon dioxide are produced at a faster rate

• The amount of heat released into the surroundings will increase

Tags

NGSS.HS-PS1-5

Based on the chemical equation, which process will increase the production of

calcium oxide?

heat + CaCO₃(s) ⇔ CaO(s) + CO₂(g)

• Decreasing the heat added to the reaction

• Regularly removing CO₂ by opening the vents

• Reducing the amount of CO₂ that escapes by closing the vents

• Reducing the amount of calcium carbonate (CaO₃) added to reduce costs

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

What is the mass of 5.00 moles K₂SO₄?

• 870 g

• 34.8 g

• 174 g

• 675 g

• 27
• 33
• 60
• 87

Tags

NGSS.MS-PS1-1

The natural isotope abundance of copper is shown below.

Isotope Percent Abundance

copper-63 69.2%

copper-65 30.8%

The average atomic mass of copper is

• 63.1 amu

• 63.6 amu

• 64.0 amu

• 64.4 amu

Tags

NGSS.HS-PS1-7

Uranium emits a type of radiation that does not penetrate human skin, but can

be harmful if it gets inside body cells. This type of emission is

• alpha radiation

• beta radiation

• gamma radiation

• neutron radiation

Tags

NGSS.HS-PS1-8