Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form or appearance of a substance without changing its chemical composition, while a chemical change results in the formation of new substances with different chemical properties.

Front

What is speed in the context of motion?

Back

Speed is the distance traveled per unit of time, typically expressed in meters per second (m/s) or kilometers per hour (km/hr).

Front

How do you calculate average speed?

Back

Average speed is calculated by dividing the total distance traveled by the total time taken.

Front

What does a speed graph represent?

Back

A speed graph visually represents the speed of an object over time, showing how speed changes at different points.

Front

What is the formula for speed?

Back

Speed = Distance / Time.

Front

What is an example of a physical change?

Back

Melting ice is an example of a physical change, as it changes from solid to liquid without altering its chemical composition.

Front

What is an example of a chemical change?

Back

Rusting of iron is an example of a chemical change, as it results in the formation of a new substance (iron oxide).

Front

What units are commonly used to measure speed?

Back

Common units for measuring speed include meters per second (m/s) and kilometers per hour (km/hr).

Front

What does a flat line on a speed graph indicate?

Back

A flat line on a speed graph indicates that the object is at rest, meaning its speed is zero.

Front

What does an upward slope on a speed graph indicate?

Back

An upward slope on a speed graph indicates that the object is accelerating, meaning its speed is increasing.