WorksheetsTCI U3 L6 Conserved Matter
Total questions: 20
Worksheet time: 1hrs 5mins
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
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
What can happen to particles during a reaction?
The particles can rearrange.
The particles can expand.
The particles can contract.
The particles can dissolve.
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.
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.
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.
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
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.
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
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.
Which trial(s) provide evidence to support the idea that the number of particles of matter did not change before and after the ice melted?
Trial 3 only
Trials 1 and 3
Trials 1, 2, and 5
Trials 1, 2, 4, and 5
Look at the patterns in the data. What is one reason all five trials did not show the pattern of matter being conserved?
Sometimes ice gains weight as it melts.
Starting with different weights of ice may affect the patterns.
The scale may need to be adjusted to provide accurate measurements.
The method of warming ice can affect the amount of matter after it is warmed.
What does conserved mean?
It has one property
All substances stay the same amount
All matter is the same total amount before a physical or chemical change.
A glass of ice water is placed on a table inside a room that is at room temperature. The ice inside the glass melts. The diagram represents the changes observed.
Which piece of evidence supports the conservation of matter during the changes shown in the diagram?
A. The contents of the glass are wet before and after the ice melts.
B. The combined mass of the glass and its contents is the same before and after the ice melts.
C. The combined mass of the glass and its contents is less after the ice melts.
D. The contents of the glass are colorless before and after the ice melts.
Matter takes up space and has _______.
weight
energy
sound
light
How many grams of LIQUID WATER are shown in the example of conservation of mass?
0 g
50 g
100 g
200 g
Zoe heats 50 grams of water until it boils and evaporates completely. What is the mass of the water vapor produced?
0 grams
25 grams
50 grams
100 grams
