TCI U3 L6 Conserved Matter

All matter is conserved during a change, which means

• dissolved in a substance

• kept in the same total amount

• heavier than before

• lighter than before

Tags

NGSS.MS-PS1-5

Durring a change of state change

• solids that turn into liquids lose matter.

• liquids that turn into solids gain weight.

• gases that turn into liquids lose weight.

• no matter is gained or lost

Tags

NGSS.MS-PS1-5

What can happen to particles during a reaction?

• The particles can rearrange.

• The particles can expand.

• The particles can contract.

• The particles can dissolve.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Why do scientists assume that the law of conservation of matter is always true?

• Scientists assume a pattern is always true if it is observed over and over again.

• Scientists believe testing the law once is enough proof.

• Scientists are usually more interested in testing new investigations.

• Scientis don't have permission to go against the law.

Tags

NGSS.MS-PS1-5

Zack and his sister put ice into their water bottles before they went on a hike. When they d rank the water an hour later, the ice was completely melted. Had he weighed the bottles of water before and after the ice melted, what would Zack have found.

• The melted ice and water weighed more than the ice and water.

• The melted ice and water weighed less than the ice and water.

• The melted ice and water weighed the same as the ice and water.

• More information is needed to answer theis question.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-4

A scientist is carrying out an investigation in which two substances, zinc and iodine, are mixed. A new substance called zinc oxide forms. What reason MOST LIKELY explains why the scientist does not check the weight of the substances before and after the reaction?

• She does not have the right tools to measure the weight of the substances.

• She assumes that the law of conservation of matter always holds true.

• She is worried that it will take too much time to obtain those measurements.

• She thinks it would be too challenging for her to weigh the substances because the reaction releases heat.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-4

Cameron takes Vitamin C tablets that need to be dissolved in water. How does the weight from the tablets and water change after they mixed together and warmed in the microwave?

• The weight increases significantly.

• The weight decreases significantly

• The weight does not change.

• The weight increases slightly

Tags

NGSS.MS-PS1-5

When vinegar and baking soda react, carbon dioxide gas is produced. Gas easily escapes into the air. If you measure the weights of the substances before and after the reaction, you will have evidence that matter is conserved. Which method would give you the most exact measurements?

• Perform the reaction in a closed container such as a sealed plastic bag.

• Perform the reaction in an open container and block the openings as the reaction is occurring.

• .Perform the reaction in an open container and estimate the weight of the gas that is lost.

• Assume that the matter is conserved because there is no way to contain the carbon dioxide gas.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Henry is on a hike with his class at the state park. What is an example of when it would make sense for Henry to assume that matter is conserved without taking measurements?

• When mountain snow begins to melt in the spring.

• Whena fire burns producing ash and various gases.

• When water in a lake evaporates into the atmosphere

• all the above

Tags

NGSS.MS-ESS2-4

Investigation: Students in a science class did the following experiment to find out what happens to the weight of matter when it is warmed. Their teacher gave them a sheet of paper with materials and instructions. They recorded their data in a table, shown to the left. Materials: scale, ice, 5 new zipper palstic bags.

Steps: 1. Put a handful of ice cubes in a plastic bag and seal it. 2. Put the bag with ice on a scale and measure its weight. Record the mass in the data table. 3. Put the bag with ice in a warm place in the room (in the sun, under your arm, under a lamp) until the ice changes to water. 4. Place the bag with water on a scale to measure its weight. 5. Repeat the steps 1-4 four more times.

What does the data tell you about how the experiment worked?

• The data show that matter was conserved in one out of five trials.

• The data show that matter was conserved in four out of five trials.

• The data show that matter was conserved in all five trials.

• The data show that matter was not conserved in any of the trials.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-4