Science 8th Grade Assessment Test 1st 2nd and 3rd Nine Wee

8.P.11

Which is a compound?

• sodium

• air

• nitrogen

• sugar

8.P.1.3

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 than before they were poured together. Which best describes this observation?

• Some of the atoms during the reaction changed to a different kind of atom.

• Some of the atoms during the reaction became heavier.

• Some of the atoms during the reaction were destroyed.

• Some of the atoms during the reaction escaped into the air.

8.P.1.4

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

H2CO3 → H2O + CO2

• Several molecules of water are produced.

• The mass of carbon atoms is reduced during the reaction.

• The mass of hydrogen atoms is the only thing that remains the same before and after the reaction.

• The mass of the atoms in the reactant equals the mass of the atoms in the products.

8. E.1.2

How would a large increase in the salinity of an estuary most likely affect the ecosystem of the estuary?

• The number of salt-intolerant organisms would increase, and the number of salt-tolerant organisms would decrease.

• The number of salt-tolerant organisms would increase, and the number of salt-intolerant organisms would decrease

• All organisms would continue to live as they now do.

• All organisms would die.

8.E.1.3

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

• high turbidity levels in the lake

• high dissolved-oxygen levels in the lake

• cold water temperature of the lake

• many varieties of fish in the lake

8.E.2.1

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

• The two rock layers were deposited at approximately the same time

• The index fossil will also occur in sediment deposited on top of these rock layers.

• The fossil organism evolved independently in the two separate areas.

• The deposition rate of the two rock layers was identical.

8.E.2.2

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

• Both mountains and ocean floors have similar minerals in their rocks.

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

• Freshwater rivers flow to the ocean.

• There are underwater mountains on the ocean floor today

8.L.1.1

Which disease is caused by a fungal infection?

• athlete’s foot

• chicken pox

• influenza

• intestinal worms

8.L.3.1

In some environments, wolves prey on deer for their source of food. If all of the wolves were taken from the environment, what would most likely happen to the deer population?

• The deer population would change color, because they would not have to hide from wolves.

• The deer population would decrease, because there would be an increase in disease.

• The deer population would become larger and healthier animals.

• The deer population would increase and begin to compete for food.

8.L.3.2

How are mutualism and parasitism different?

• Both organisms benefit in parasitism, while in mutualism only one organism benefits at the other’s expense.

• Both organisms benefit in mutualism, while in parasitism one organism benefits, and the other is neither harmed nor benefits.

• Both organisms benefit in mutualism, while in parasitism only one organism benefits at the other’s expense.

• Both organisms benefit in parasitism, while in mutualism one organism benefits, and the other is neither harmed nor benefits.