Question 1

Which is a compound?

Accepted Answer

sugar

Answer

nitrogen

Answer

sodium

Answer

air

Question 2

Two different liquids are poured together in an open container. Bubbles begin to form. After the bubbling stops, it is determined that the total weight of the two liquids is less. Which best describes why?

Accepted Answer

Some of the atoms during the reaction escaped into the air

Answer

Some of the atoms were destroyed.

Answer

Some of the atoms became heavier.

Answer

Some of the atoms changed into a different atom.

Question 3

This is the chemical reaction for the decomposition of carbonic acid into water and carbon dioxide.

H₂CO_{_{3 ------->}}H₂ +CO₂

How does the reaction support the Law of Conversation of Mass?

Accepted Answer

Mass of the reactants is equal to the mass of the products.

Answer

The mass of hydrogen is the only one that remains the same.

Answer

Several molecules of water are produced.

Answer

The mass of carbon atoms is reduced during the reaction

Question 4

Which would indicate the water in a lake was not safe for drinking?

Accepted Answer

high turbidity levels in the lake

Answer

high dissolved oxygen levels in the lake

Answer

many varieties of fish in the lake

Answer

Cold water temperature of the lake

Question 5

A geologist identifies the identical index fossils in rock layers from two different areas. Which conclusion is BEST supported by this discovery?

Accepted Answer

The two rock layers were deposited about the same time

Answer

The deposition rate of the two rock layers was identical.

Answer

The fossil organism evolved independently in the two separate areas.

Question 6

Which supports the theory that some mountains were once at the bottom of an ocean?

Accepted Answer

Fossils of marine organisms are found on the tops of some mountains.

Answer

There are underwater mountains on the ocean floor today.

Answer

Freshwater rivers flow to the ocean

Answer

Both mountains and ocean floors have similar minerals as their rocks.

Question 7

Accepted Answer

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