PS.5.1.1 (5.P.2.2) #2: Schoolnet

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass cannot be created or destroyed in a closed system. The total mass of the system remains constant, regardless of the processes acting inside the system.

Front

What happens to the mass of an object when it changes state (e.g., solid to liquid)?

Back

The mass of the object remains the same when it changes state. For example, when ice melts into water, the mass of the ice cube is equal to the mass of the water.

Front

What is mass?

Back

Mass is a measure of the amount of matter in an object, typically measured in kilograms (kg) or grams (g).

Front

How do you calculate the total mass of multiple objects?

Back

To find the total mass of multiple objects, add the mass of each object together.

Front

If a boulder and a soccer goal have the same mass, what can we say about their weights?

Back

If they have the same mass, they also have the same weight, assuming they are in the same gravitational field.

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. Weight can change depending on the gravitational field.

Front

What happens to the mass of gold when it is melted?

Back

The mass of gold remains the same when it is melted; it does not increase or decrease.

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 but retains its mass.

Front

What is an example of a chemical change?

Back

Burning wood is an example of a chemical change, as it transforms into ash and gases, changing its mass and composition.

Front

What is density?

Back

Density is the mass of an object divided by its volume, often expressed in grams per cubic centimeter (g/cm³).