Lesson on Matter and Changes in Matter

Understanding Conservation of Matter Using Graphs

What is Matter?

• Matter is anything that has mass and takes up space. This includes solids, liquids, and gases.

The Law of Conservation of Matter

• Matter cannot be created or destroyed; it can only change forms.

Open Ended

When ice melts, where does the matter go?

When Matter Changes Form

• Whether something is melting, dissolving, or evaporating, the total amount of matter remains the same.

• Example: Melting ice – Ice changes to water, but the amount of matter stays the same.

How Do We Use Graphs to Show Matter?

• Graphs can be used to show the weight of matter before and after it changes form.

• Example: A graph showing the weight of an apple before it is cut, and the pieces afterward.

Tracking Matter in a Recipe

• When you mix ingredients to bake a cake, the total weight of the cake is the same as the ingredients you started with, even though they look different.

Multiple Choice

What does the Law of Conservation of Matter State?

• Matter can be created and destroyed

• Matter is only present in solid form

• Matter cannot be created of destroyed, only changes form

• Matter disappears when it evaporates

Does Matter Disappear?

• When you dissolve sugar in water, it may seem like the sugar disappears, but it’s still there!

• The mass of the water and sugar combined doesn’t change!

Putting It All Together!

• Conservation of matter means that matter is always conserved, even when it changes form. Graphs help us visually track these changes.

Multiple Choice

If you weigh a piece of ice before and after it melts, what will the weight be?

• The ice will weigh more when it’s water.

• The ice will weigh less after it melts.

• The weight will stay the same, whether it’s ice or water.

• The water will disappear, so there will be no weight.

Multiple Choice

Which graph would best show that the total amount of matter is conserved when a substance changes form?

• A graph that shows decreasing weight.

• A graph where the weight stays the same before and after.

• A graph with random changes in weight.

• A graph that only shows half of the weight before and after.

Multiple Choice

When sugar dissolves in water, what happens to the sugar?

• It disappears completely.

• It is still there, but you can’t see it.

• It turns into gas.

• It loses its weight.

Multiple Choice

You bake a cake using eggs, flour, and sugar. After the cake is baked, what happens to the total mass of the ingredients?

• The mass decreases because it changed form.

• The mass increases as the cake rises.

• The mass stays the same because the amount of matter is conserved.

• The mass changes only if the cake is cut.