Conservation of Matter

Sally heats a pan of 100 grams of water till it starts to boil. She then adds 20 grams of salt to the pan. She stirs it until all of the salt dissolves. Sally pours the mixture into a new container on a scale that has is set to 0 grams. What will the new weight be?

• 20 grams

• 100 grams

• 120 grams

• 80 grams

Lamonte is doing a science experiment. They have a jar full of 10 grams of sugar. They add 5 grams of a mystery chemical. When the two are mixed, they create a new solid and no gases. The container is very hot. How many grams of the new substance should be in the jar at the end of the experiment? 

• 50 grams

• 5 grams

• 500 grams

• 15 grams

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

A scientist adds a few teaspoons of sugar to a cup of warm water and begins to stir. Eventually the sugar dissolves into the water. Which of the following graphs best represents the amount of matter in the sugar before and after the scientist began stirring?

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Tags

NGSS.MS-PS1-5

Meredith's class watched the teacher perform a demonstration in class today. She claimed that she could provide evidence that matter is conserved. She found the mass of a few ice cubes and a cup of water filled about 2/3 of the way. She let the ice cubes melt and then found the mass again. The data table below shows her results.

• The total mass was the same when the ice cubes were solid or liquid.

• The total mass was the same when the ice cubes were solid or liquid.

• The ice cubes melted when placed in the water.

• There is no evidence of matter being conserved.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Kaitlyn's class watched the teacher perform a demonstration in class today. She claimed that she could provide evidence that matter is conserved. She found the mass of sugar and a cup of water filled about 2/3 of the way. She let the sugar dissolve in the water and then found the mass again. The data table below shows her results.

The mass of the dissolved sugar and water is missing. Following the Law of Conservation of Matter, what should the mass of the two substances be?

• 56.0 g

• 97.1 g

• 88.7 g

• 41.6 g

Tags

NGSS.MS-PS1-5

Will the mass change when reactants combine to form products in a chemical reaction? Why?

• Yes; A new substance is bring formed, so the mass will increase.

• There is no way to know what will happen to the mass of the substances without exact data.

• No; The combined mass of the newly formed and existing substances will stay the same.

• Only if it is changing from a liquid to a gas.

Tags

NGSS.MS-PS1-5

Danielle's class was investigating the Law of Conservation of Matter in science today. They found the mass of a piece of construction paper and then ripped it in half, into quarters, and then eighths. They found the mass at each stage and recorded it on the graph below.

True or False: The mass of the paper was conserved throughout the investigation.

• True

• False

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Cayman left an ice cube in a cup. After an hour, the ice had changed into liquid water. The liquid water has the same _______ as the solid ice cube

• temperature

• mass

• shape

• state of matter

Tags

NGSS.MS-PS1-4

200 g of liquid water is frozen in an ice cube tray. What is the total mass of all of the ice cubes?

• More than 200 grams

• Less than 200 grams

• Twice the amount of water

• Exactly 200 grams

Tags

NGSS.MS-PS1-5

Matter must have ____ and ______.

• Weight, scent

• texture, take up space

• Weight, Texture

• Weight; take up space

Tags

NGSS.5-PS1-2