8th Grade Science Review

Front

What is a chemical formula?

Back

A representation of a substance using symbols for its constituent elements, indicating the number of atoms of each element.

Front

How do you calculate average speed?

Back

Average speed is calculated using the formula S = d/t, where S is speed, d is distance, and t is time.

Front

What is a valence electron?

Back

Electrons in the outermost energy level of an atom that are involved in chemical bonding.

Front

What is the easier walking path if Path B to C is about the same distance as Path E to N?

Back

Path B to C is the easier walk.

Front

What was Wegener's hypothesis about continental movement called?

Back

The Continental Drift.

Front

What is the definition of a coefficient in a chemical equation?

Back

A number placed in front of a chemical formula to indicate how many molecules or atoms are involved in the reaction.

Front

What is the significance of the atomic number?

Back

The atomic number represents the number of protons in the nucleus of an atom, determining the element's identity.

Front

What is the formula for calculating speed?

Back

Speed = Distance / Time.

Front

What are tectonic plates?

Back

Large sections of the Earth's lithosphere that move and interact, causing geological activity such as earthquakes and volcanic eruptions.

Front

What is the difference between mass and weight?

Back

Mass is the amount of matter in an object, while weight is the force exerted by gravity on that mass.