Question

What is always true according to the Law of Conservation of Matter?(1 point)
Responses

Atoms can be rearranged during a chemical reaction but cannot be added or taken away.
Atoms can be rearranged during a chemical reaction but cannot be added or taken away.

New molecules cannot be formed from the reactants during a chemical reaction.
New molecules cannot be formed from the reactants during a chemical reaction.

Atoms created during a chemical reaction must have the same mass as the atoms in the reactants.
Atoms created during a chemical reaction must have the same mass as the atoms in the reactants.

The total number of molecules before and after a chemical reaction stays the same.

Answers

Answered by Bryson cook
What is always true according to the Law of Conservation of Matter?(1 point)
Responses

Atoms can be rearranged during a chemical reaction but cannot be added or taken away.
Atoms can be rearranged during a chemical reaction but cannot be added or taken away.

New molecules cannot be formed from the reactants during a chemical reaction.
New molecules cannot be formed from the reactants during a chemical reaction.

Atoms created during a chemical reaction must have the same mass as the atoms in the reactants.
Atoms created during a chemical reaction must have the same mass as the atoms in the reactants.

The total number of molecules before and after a chemical reaction stays the same.
The total number of molecules before and after a chemical reaction stays the same.
Answered by Bryson cook
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 combined liquid was warmer than the two separate liquids.
The combined liquid was warmer than the two separate liquids.

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 reaction produced a gas that escaped the beaker.
Answered by Bryson cook
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 combined liquid was warmer than the two separate liquids.
The combined liquid was warmer than the two separate liquids.

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 reaction produced a gas that escaped the beaker.
The reaction produced a gas that escaped the beaker.
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Answered by Bryson cook
Which procedure could be used to demonstrate that matter is conserved during a chemical change or reaction?(1 point)
Responses

Find the mass of a piece of paper. Tear the paper into smaller pieces. Find the mass of the pieces.
Find the mass of a piece of paper. Tear the paper into smaller pieces. Find the mass of the pieces.

Find the mass of an acid and a base. Combine them to produce water and a salt. Find the mass of the water and salt.
Find the mass of an acid and a base. Combine them to produce water and a salt. Find the mass of the water and salt.

Find the mass of a log. Burn the log until it turns to ash and smoke. Find the mass of the ash.
Find the mass of a log. Burn the log until it turns to ash and smoke. Find the mass of the ash.

Find the mass of a stick of butter. Heat the butter until it melts. Find the mass of the melted butter.
Answered by Bryson cook
Suppose 10 atoms of carbon (C) react with 20 atoms of oxygen (O) to form 10 molecules of carbon dioxide ( CO2
). According to the law of conservation of matter, how many atoms are present in this reaction?(1 point)
Responses

30
30

10
10

15
15

20
20
Answered by GPT-4o mini
The correct response according to the Law of Conservation of Matter is:

**Atoms can be rearranged during a chemical reaction but cannot be added or taken away.**

This law states that in a closed system, the total mass of reactants equals the total mass of products, meaning that atoms are neither created nor destroyed during a chemical reaction; they are simply rearranged to form new substances.
Answered by GPT-4o mini
The correct response according to the Law of Conservation of Matter is:

**Atoms can be rearranged during a chemical reaction but cannot be added or taken away.**

This reflects the principle that while atoms can change their bonds and form new substances during a chemical reaction, the total number of atoms remains constant. The other options are not accurate descriptions of the law.
Answered by GPT-4o mini
The correct statement that explains why the student’s claim is incorrect is:

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

This indicates that some matter (in the form of gas) was lost to the surroundings during the reaction, which can account for the decrease in mass observed. The Law of Conservation of Matter still holds true; it just means that not all the matter was contained within the beaker during the experiment.
Answered by GPT-4o mini
The correct statement that explains why the student’s claim is incorrect is:

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

This response clarifies that the observed decrease in mass is not a violation of the Law of Conservation of Matter; rather, it indicates that some of the matter (in the form of gas) was released into the environment during the reaction, resulting in a lower total mass in the beaker.
Answered by GPT-4o mini
The procedure that could be used to demonstrate that matter is conserved during a chemical change or reaction is:

**Find the mass of an acid and a base. Combine them to produce water and a salt. Find the mass of the water and salt.**

This approach allows for a clear chemical reaction where products are formed from reactants. By measuring the mass before and after the reaction, the student can demonstrate that the total mass remains constant, thereby illustrating the Law of Conservation of Matter.
Answered by GPT-4o mini
To determine how many atoms are present in the reaction, we can count the atoms of carbon and oxygen before the reaction.

- You start with 10 atoms of carbon (C).
- You have 20 atoms of oxygen (O).

So, the total number of atoms before the reaction is:

\( 10 \, (C) + 20 \, (O) = 30 \text{ atoms} \)

After the reaction, carbon dioxide (CO₂) is produced. Each molecule of CO₂ consists of 1 carbon atom and 2 oxygen atoms. In total, for 10 molecules of CO₂, there are:

- 10 carbon atoms
- \( 10 \times 2 = 20 \) oxygen atoms

Adding these gives:

\( 10 \, (C) + 20 \, (O) = 30 \text{ atoms} \)

Thus, the total number of atoms present in the reaction, both before and after, is still 30.

The correct response is:

**30**

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