Which procedure could be used to demonstrate that matter is conserved during a chemical change or reaction?(1 point)

Question

Responses

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 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 a stick of butter. Heat the butter until it melts. Find the mass of the melted butter.

Answer 1

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 method clearly illustrates the conservation of mass in a chemical reaction. By measuring the mass of the reactants (acid and base) and comparing it to the mass of the products (water and salt), you can show that the total mass before and after the reaction remains constant, demonstrating that matter is conserved.

Answer 2

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

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.

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.

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

Answer 3

The statement that is always true 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 principle emphasizes that during a chemical reaction, the total number of atoms remains constant; they are simply rearranged to form new substances, but no atoms are created or destroyed in the process.

Answer 4

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

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

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

The combined liquid was warmer than the two separate liquids.
The combined liquid was warmer than the two separate liquids.

Answer 5

The statement that explains why the student’s claim is incorrect is:

The reaction produced a gas that escaped the beaker.

This suggests that the loss of mass observed is due to the gas that was released during the reaction. The Law of Conservation of Matter states that matter cannot be created or destroyed, so if gas escaped the beaker, it accounts for the difference in mass.