8th Grade Science EOG Review #1

Front

Which examples represent parasitic relationships?

Back

1 and 3

Front

A teacher asks her students to classify the substances listed in the table shown as elements, compounds, or mixtures. A student claims that all of the substances are compounds. Which statement correctly describes the student’s claim?

Back

The student’s claim is correct because the atoms in the substances are chemically combined to form a compound.

Front

What makes 97% of the water on Earth unfit for drinking?

Back

It is highly saline.

Front

A researcher measures the pH of the lake water as 5.3. Which conclusion correctly describes the effect on aquatic species if additional acidic water is released into the lake?

Back

The pH of the lake will decrease, making the water more suitable for the survival of salmon.

Front

Which step of water treatment requires an addition of chlorine? A. aeration of water, B. disinfection of water, C. filtration of impurities, D. sedimentation of impurities

Back

disinfection of water

Front

How will the decrease in the honey bee population affect the ecosystem?

Back

It will decrease the percentages of almond and apple crops because lesser numbers of honey bees are available for pollination.

Front

Which observation describes a chemical change?

Back

#3

Front

Which statement correctly describes the behavior of dissolved gases in each of the two regions (X and Y) as ocean depth increases? A. Region Y would contain more dissolved gases than region X as the water is deeper and colder. B. Region X would contain more dissolved gases than region Y as the water is deeper and colder. C. Region Y would contain more dissolved gases than region X as the water is shallower and warmer. D. Region X would contain more dissolved gases than region Y as the water is shallower and warmer.

Back

Region Y would contain more dissolved gases than region X as the water is deeper and colder.

Front

What should the student do to improve the model of the ecosystem with goldfish and butterfly fish?

Back

The student should add small rocks and aquatic plants to the jar.

Front

Which city(ies) need(s) to be concerned with potential algal blooms caused by the excess nitrate and phosphate pollution, and why?

Back

New Bern; the pollution will only travel downstream within the river basin.