8th grade Semester 1 Review

Front

What are valence electrons?

Back

Valence electrons are the electrons in the outermost shell of an atom that are involved in chemical bonding.

Front

How many valence electrons does Helium have?

Back

Helium has 2 valence electrons.

Front

What season is the Northern Hemisphere experiencing when it is tilted away from the sun?

Back

Winter.

Front

What is acceleration?

Back

Acceleration is the rate at which an object changes its velocity, which includes speeding up, slowing down, or changing direction.

Front

What evidence indicates a chemical reaction has occurred?

Back

The formation of a dark solid on the zinc metal indicates a chemical reaction.

Front

Why does the area around the equator maintain a consistent temperature throughout the year?

Back

The equator always receives direct sunlight.

Front

What is the difference between speed and velocity?

Back

Speed is a scalar quantity that refers to how fast an object is moving, while velocity is a vector quantity that includes both speed and direction.

Front

What is the formula for calculating acceleration?

Back

Acceleration = (Final Velocity - Initial Velocity) / Time.

Front

What is a chemical reaction?

Back

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.

Front

What is the significance of the equator in terms of climate?

Back

The equator is significant because it receives the most direct sunlight, leading to a warm climate year-round.