NC 8th Grade Science EOG Review

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What is urban runoff?

Back

Urban runoff is a source of water pollution that includes oil and gasoline discharge from automobiles and storm sewer discharge.

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What does the Law of Conservation of Mass state?

Back

The Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction. An example is the equation @@2H_2 + O_2 ightarrow 2H_2O@@.

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How can genetic variation occur due to environmental changes?

Back

Genetic variation may result from environmental changes, such as an arctic fox changing its color over time when migrating to a different climate.

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What is the Law of Superposition?

Back

The Law of Superposition states that in undisturbed layers of rock, the oldest layers are at the bottom and the youngest are at the top.

Front

Which group of elements does chlorine most readily bond with?

Back

Chlorine, which has 7 valence electrons, most readily bonds with elements in group 1.

Front

What is the definition of valence electrons?

Back

Valence electrons are the electrons in the outermost shell of an atom that are involved in forming bonds.

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What is the significance of recent changes in species found in rock layers?

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Recent changes in species found in rock layers provide evidence for the theory of evolution and support the Law of Superposition.

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What is the relationship between cell theory and the theory of evolution?

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Cell theory states that all living things are made of cells, while the theory of evolution explains how species change over time. Both concepts are fundamental to understanding biology.

Front

What is an example of urban runoff?

Back

An example of urban runoff is the discharge of oil and gasoline from vehicles into storm drains.

Front

What is the chemical equation for the formation of water?

Back

The chemical equation for the formation of water is @@2H_2 + O_2 ightarrow 2H_2O@@.