Fall Semester Review

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include melting, freezing, and dissolving.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and the rearrangement of atoms. Examples include burning wood and rusting iron.

Front

What does a speed graph show?

Back

A speed graph visually represents the motion of an object over time, indicating how fast the object is moving at different intervals.

Front

How can you determine the fastest motion from a graph?

Back

The fastest motion can be determined by identifying the steepest slope on a distance-time graph, which indicates the highest speed.

Front

What is the total number of atoms in a water molecule (H₂O)?

Back

A water molecule consists of 3 atoms: 2 hydrogen atoms and 1 oxygen atom.

Front

What is constant speed?

Back

Constant speed refers to motion at a fixed distance per unit of time, meaning the speed does not change.

Front

What is acceleration?

Back

Acceleration is the rate of change of velocity of an object. It occurs when an object speeds up, slows down, or changes direction.

Front

What does it mean when an object is not moving?

Back

An object is not moving when its position does not change over time, resulting in a horizontal line on a distance-time graph.

Front

What are the signs of a chemical change?

Back

Signs of a chemical change include color change, temperature change, gas production, and the formation of a precipitate.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.