What is an example of a physical change?
what is an example of a physical change?

having less ash than the paper that was burned to form it
ice forming and then melting back into water
rust having a different identity than the iron it forms on
the irreversible reaction of vinegar and baking soda

Ice forming and then melting back into ice

Explanation:

HERES ALL THE TEST ANSWERS

Explanation:

Physical Properties

1-What happens when a substance undergoes a physical change?

answer-Some physical properties change, but the substance keeps its identity.

2-What is an example of a physical change?

answer-ice forming and then melting back into water

3-When liquid gold becomes a solid, its particles get closer together. Which best describes what happened to the gold?

answer-the rearrangement of particles in a physical change

4-Eugene describes the physical property of a material as “sweet and floral.” What physical property of the material is Eugene most likely observing?

answer-odor

5-Which can occur during physical change?

answer-The particles can arrange in different ways.

6-If there is 8 g of a substance before a physical change, how much will there be afterwards?

answer- 8 grams

7-Which statement about the physical change of liquid water boiling into steam is true?

answer-the heat added represents an energy change

8-Fifteen grams of a liquid plastic are frozen in a physical change that increases the volume. What can be known about the plastic after the change?

answer- it will still weigh 15 grams

9-Which statement best compares and contrasts two physical properties of matter?

answer-Boiling points and melting points are similar because they both involve the change in a state of a material, but they are different because boiling point involves a change from a liquid to a gas and melting point involves a change from a solid to a liquid.

10-Serena is mixing a material into a beaker filled with a liquid. She notices that the material seems to disappear into the liquid. What physical property of the material is Serena most likely observing?

answer-solubility

Explanation:

  distance on the y-axis and time on the x-axis.

explanation:

the instantaneous velocity = change in position/time taken

the slope of the graph should give instantaneous velocity.

  slope of a graph = change in value of y -axis / change in values of x -axis

  comparing both the equations

    change in value of y -axis = change in position

  change in values of x -axis = time taken

so position values should be on the y axis and time values should be on the x axis.

distance on the y-axis and time on the x-axis.

pythagoras' theorem

square root (-5^2+9^2)

square root (25+81)

square root (106)

angle is tan^-1(9/5)

neg x, pos y