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A student combines two liquids in a beaker. She observes that the mass of the combined liquid is less than the mass of the two separate liquids. The student claims that this observation shows that matter is not conserved in chemical reactions. Which statement explains why the student’s claim is incorrect?(1 point)

Responses

The reaction produced a gas that escaped the beaker.
The reaction produced a gas that escaped the beaker.

The reaction did not change the physical properties of the liquids.
The reaction did not change the physical properties of the liquids.

The product contained fewer atoms than the reactants.
The product contained fewer atoms than the reactants.

The combined liquid was warmer than the two separate liquids.

A scientist burns a newspaper completely to ash. How does the newspaper’s initial mass compare to the total mass of the ashes and the gases released from burning the newspaper?(1 point)
Responses

The newspaper’s initial mass will be double the total mass of the ashes and the gases released
The newspaper’s initial mass will be double the total mass of the ashes and the gases released

The newspaper’s initial mass will be one-fourth of the total mass of the ashes and the gases released
The newspaper’s initial mass will be one-fourth of the total mass of the ashes and the gases released

The newspaper’s initial mass will equal the total mass of the ashes and the gases released
The newspaper’s initial mass will equal the total mass of the ashes and the gases released

The newspaper’s initial mass will be half of the total mass of the ashes and the gases released

The law of conservation of mass applies during all physical and chemical changes. According to this law, during a chemical change, atoms are __________.(1 point)
Responses

bonded
bonded

created
created

rearranged
rearranged

destroyed

In art class, two students each receive their own 100-gram lump of clay. Each student then uses their clay to make a sculpture, and both students use all of their clay. One student makes a clay boat that can float in water. The other creates a clay cube that sinks in water. What is most likely true about the sculptures?(1 point)
Responses

The sculpture that floats has less mass.
The sculpture that floats has less mass.

The sculpture that sinks has more mass.
The sculpture that sinks has more mass.

The mass of the two sculptures together is 100 grams
The mass of the two sculptures together is 100 grams

Each sculpture’s mass is 100 grams.

Which chemical equation below shows a balanced reaction that follows the law of conservation of matter?(1 point)
Responses

2H2 + 2O2 → 2H2O
2H 2 + 2O 2 → 2H 2 O

H2 + O2 → H2O
H 2 + O 2 → H 2 O

H2 + O2 → 2H2O
H 2 + O 2 → 2H 2 O

2H2 +O2 → 2H2O
2H 2 +O 2 → 2H 2 O

2 answers

Here are the answers to each of the questions based on principles of chemistry and the conservation of mass:

  1. Why is the student's claim that matter is not conserved incorrect?

    • Response: The reaction produced a gas that escaped the beaker.

  2. How does the newspaper’s initial mass compare to the total mass of the ashes and gases released?

    • Response: The newspaper’s initial mass will equal the total mass of the ashes and the gases released.

  3. According to the law of conservation of mass, during a chemical change, atoms are __________.

    • Response: rearranged.

  4. What is most likely true about the sculptures?

    • Response: Each sculpture’s mass is 100 grams.

  5. Which chemical equation shows a balanced reaction that follows the law of conservation of matter?

    • Response: 2H2 + O2 → 2H2O

If you need further clarification or information on any of these topics, feel free to ask!

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