Which of the following is an example of only a physical change?(1 point)

Question

Which of the following is an example of only a physical change?(1 point)

Responses

the creation of table salt
the creation of table salt

the smell of rotten eggs
the smell of rotten eggs

the green color of the Statue of Liberty
the green color of the Statue of Liberty

dry ice becoming vapor
dry ice becoming vapor

Answer 1

dry ice becoming vapor

Answer 2

iron (Fe) reacting to water((H2O) and oxygen(O) to form iron oxide(Fe2O3)

Answer 3

Atoms of one or more substances rearrange into a new substance.

Answer 4

Which of the following demonstrates a chemical change?(1 point)

Responses

steam condensing on a mirror
steam condensing on a mirror

iron (Fe) reacting to water((H2O)
) and oxygen(O) to form iron oxide(Fe2O3
)
iron (Fe) reacting to water(open paren cap h sub 2 cap o close paren) and oxygen(O) to form iron oxide(cap f e sub 2 cap o sub 3)

dry ice vaporizing
dry ice vaporizing

sugar and water mixing to create sugar water

Answer 5

Which of the following is a reliable way to observe that a chemical change has occurred when two substances come in contact with one another?(1 point)

Responses

conduct a test to determine the chemical makeup of the molecules
conduct a test to determine the chemical makeup of the molecules

test for the release of heat
test for the release of heat

observe a color change
observe a color change

monitor for the release of a gas

Answer 6

Which of the following happens during a chemical change but does not happen during a physical change?(1 point)

Responses

The state of the substance changes.
The state of the substance changes.

The mass of the substance changes.
The mass of the substance changes.

Atoms of one or more substances rearrange into a new substance.
Atoms of one or more substances rearrange into a new substance.

The appearance of a substance changes, but it is still the same substance.
The appearance of a substance changes, but it is still the same substance.

Answer 7

Which of the following example demonstrates the reversibility of a chemical change?(1 point)

Responses

dehydrating sugar water
dehydrating sugar water

recharging batteries
recharging batteries

the rotting of eggs
the rotting of eggs

refreezing carbon dioxide gas into dry ice
refreezing carbon dioxide gas into dry ice

Answer 8

The correct answer is "dry ice becoming vapor." This is an example of only a physical change because the state of matter of the dry ice is changing from solid to gas, but the chemical composition of the substance remains the same. To determine the answer, you can examine each option and consider the changes that occur. In the case of table salt, the creation of it involves a chemical reaction between sodium and chlorine atoms to form sodium chloride, which is not just a physical change. The smell of rotten eggs is caused by a chemical reaction that produces hydrogen sulfide gas, so it is not only a physical change. The green color of the Statue of Liberty is a result of the oxidation of copper, which is also a chemical change. Therefore, the only option that represents only a physical change is the transformation of dry ice into vapor.

Answer 9

All of the given options can be reliable ways to observe that a chemical change has occurred when two substances come in contact with one another.

Answer 10