Question

differentiating chemical changes
directions: complete the tasks by writing notes using the words in the
given bank below. to mix your answers, click on the blanks and
type.

a simple piece of paper can be folded or cut into many shapes.
only the shape of the paper has ______. the paper is still paper.
no new substances are formed, and the amount of mass or matter is the
same. this is a ______ change.

this is most often seen when water freezes or ice melts. only the state of
matter changes. water is still water. no ______ and the amount of matter is the same.

if we mix salt with water, how would you explain this change?

a mixture of salt and water is called a ______. when you mix
salt in water to make a solution, you cannot get the salt back. making a
solution is a physical change because no new substances are formed.

if we burn paper to start a campfire, how is paper changed now?

a change to identify the word of is a physical change and a chemical change or not.

the ______ of the hot, popped as a result of the chemical change
does not seem to have the same mass as the original mass.

what happened to the missing mass?

the burning paper absorbed the heat as ______ and the
ashes weigh almost the same as the burned paper left behind.

if i would test the acid rain of the rain evidences having the same ph as
the local rain, the mass of the substances before burning the
chemical change is the same as the mass of the substances made after the
change.

when we observe some changes, a physical change or a chemical change?
after the change, the substance remains the same before, the
______ of the substance (size, shape, texture, color) or the state of
matter (liquid, solid, gas) may change. however, during the process of
a ______, new substances are formed.

what kind of change takes place when you burn a match? a chemical
change or a physical change?

the burning of a match is a chemical change because a new substance
______ is formed. also, energy in the form of heat and light is
given off.

the release of ______ is another way that a chemical change has occurred.

what indicates that a chemical change is taking place here?

lemon juice when reacting in the presence of coffee grounds. we see a
____ change or is mixed with ____, a chemical change
becomes visible as a result of a color change. we can see
the bubbles.

the release of ______ is another way that a chemical change has occurred.

what indicates that a chemical change is taking place here?

lemon juice when reacting in the presence of coffee grounds. we see a
____ change or is mixed with ____, a chemical change
becomes visible as a result of a color change. we can see
the bubbles.

Explanation:

The problem is about classifying changes (physical or chemical) and understanding concepts related to matter and energy changes, which falls under Chemistry (a subfield of Natural Science). For the question "If we burn paper to start a campfire, how is paper changed now?", burning paper involves a chemical reaction where paper (mainly cellulose) reacts with oxygen to form new substances like carbon dioxide, water vapor, and ash. This is a chemical change because new substances are formed, and it involves a rearrangement of atoms with energy release (heat and light).

Answer:

When we burn paper to start a campfire, the paper undergoes a chemical change. In this process, the paper (composed of organic compounds like cellulose) reacts with oxygen from the air. The chemical bonds in the paper's molecules are broken, and new substances (such as carbon dioxide gas, water vapor, and solid ash) are formed. This is a chemical change because: 1) New substances with different chemical properties are produced. 2) The process is accompanied by energy changes (release of heat and light, characteristic of combustion reactions). 3) The original paper (its chemical identity) is destroyed, and it cannot be restored to its original form by simple physical means (unlike a physical change like cutting or folding).