Retest EOU 18wk

Front

What is an Alkali Metal?

Back

Alkali metals are a group of elements in Group 1 of the periodic table, characterized by their high reactivity and the presence of one electron in their outermost shell. Examples include lithium (Li), sodium (Na), and potassium (K).

Front

What does an unbalanced force do to an object?

Back

An unbalanced force causes an object to accelerate, change direction, or change shape. It results in a net force acting on the object.

Front

What is a thermal insulator?

Back

A thermal insulator is a material that slows down the transfer of heat. Examples include rubber, glass wool, and Styrofoam.

Front

How does temperature affect the kinetic energy of molecules?

Back

As temperature decreases, the average kinetic energy of the molecules decreases, leading to slower movement and less energy.

Front

What is the difference between a thermal conductor and a thermal insulator?

Back

A thermal conductor allows heat to pass through easily (e.g., metals), while a thermal insulator resists heat transfer (e.g., wood, plastic).

Front

What happens to the kinetic energy of molecules when a substance is heated?

Back

When a substance is heated, the average kinetic energy of its molecules increases, causing them to move faster.

Front

What is the significance of the distance-time graph in physics?

Back

A distance-time graph shows how the distance traveled by an object changes over time, indicating its speed and direction.

Front

What are examples of incorrectly classified items?

Back

Incorrectly classified items are those that do not fit the criteria of the category they are placed in. For example, if a student classifies a solid as a liquid.

Front

What is the role of thermal energy in phase changes?

Back

Thermal energy is absorbed or released during phase changes (e.g., melting, freezing) to break or form bonds between molecules.

Front

What is the formula for calculating speed?

Back

Speed = Distance / Time.