5.P.2.2

Front

What is the principle of conservation of mass?

Back

The principle of conservation of mass states that mass is neither created nor destroyed in a chemical reaction or physical change. The total mass of the substances involved remains constant.

Front

How do you calculate the total weight of multiple objects?

Back

To calculate the total weight of multiple objects, multiply the weight of one object by the number of objects. For example, if one crayon weighs 5 grams and there are 10 crayons, the total weight is 5 grams x 10 = 50 grams.

Front

What happens to the mass of water when it freezes?

Back

The mass of water remains the same when it freezes. For example, 200 grams of water will still weigh 200 grams when it becomes ice.

Front

If a rock weighing 60 grams is broken into two pieces, what can be said about the weights of the pieces?

Back

The weights of the two pieces must add up to the original weight of the rock, which is 60 grams. Possible combinations could be 30 grams and 30 grams, or any other pair that sums to 60 grams.

Front

What is the weight of a box of candles if the total weight is 30 ounces and there are 5 candles inside?

Back

The total weight of the box of candles is 30 ounces, regardless of how many candles are inside. The weight does not change when the candles melt.

Front

What is the significance of measuring mass in grams and ounces?

Back

Grams and ounces are units of mass. Grams are part of the metric system, while ounces are part of the imperial system. Understanding both units is important for conversions and comparisons.

Front

How does melting affect the mass of a solid object?

Back

Melting does not change the mass of a solid object. For example, when candles melt, their mass remains the same, but their shape and state change.

Front

What is an example of a physical change?

Back

An example of a physical change is melting, such as when ice turns into water. The substance changes state but retains its mass.

Front

What is the relationship between mass and volume in a substance?

Back

Mass is the amount of matter in a substance, while volume is the space that substance occupies. The density of a substance is defined as its mass per unit volume.

Front

How do you determine the mass of a mixture?

Back

The mass of a mixture is the sum of the masses of its individual components. For example, if you mix 600 grams of salt with 600 grams of water, the total mass is 1200 grams.