Question

physical and chemical changes
directions: contemplate the note-taking guide below using the words in the
iuseful notes box. to assess your awareness, click on the blanks and

a single piece of paper can be folded up or cut into many ______ pieces.
how is the paper changed?
only the shape of the paper has ______. the paper is still paper.
no new substances are formed, and the amount of paper (or matter) is the
____. this is a ____.
this is most often seen when water freezes or ice melts. only the state of
matter changes. water is still water. no ______ are
formed and the amount of matter is the same.
if we now 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 see the salt (since it dissolves
evenly with the ______ of water), but it is still there, 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?

how are physical changes and chemical changes different?
a change in which the kind of matter changes and new substances with
some properties are formed is called a ______.
the ______ of the new product(s) as a result of the chemical change
were not present in the original form.
when burning or baking, new substances are formed.
the formation of new substances can be seen as ______ (the end
water, water vapor, and the ashes formed.
if you mixed two substances (for example, baking soda and vinegar), you will be able to
detect a change (such as the fizzing noise of the new substance being formed). although this
change (fizzing) is too big as the result of the substances mixing, it is the
change.
whether or not a change was through a physical change or a chemical change, the
weight, or in other words, the amount of matter, always remains the same
after the change occurs (even when you bake a cake), matter cannot be created or
destroyed. this is known as ______.
what kind of change takes place when you bake a cake?
is baking a ______?
because of absorption of energy as evidence of a chemical change.
if baking soda is mixed with ______ (a chemical indicator), we can see
that fizz takes place, results in the release of carbon dioxide. we can then use
as evidence.
the reaction of open vs. closed (grey) & chemical change: how can you tell
what indicates that a chemical change is baking bread, for example?

Explanation:

The problem is about physical and chemical changes, which falls under the Natural Science discipline, specifically Chemistry (a subfield of Natural Science). The questions involve identifying types of changes (physical or chemical) by analyzing if new substances are formed. For example, tearing paper is physical (no new substance), mixing salt and water is physical (salt dissolves, still salt and water), burning paper is chemical (new substances like ash, smoke).

Answer:

The subfield is Chemistry (under Natural Science). For the fill - in - the - blanks (assuming typical answers):

• "A single piece of paper can be torn up or cut into many \(\boldsymbol{\text{smaller}}\) pieces." (Physical change, size change, no new substance)
• "Only the shape of the paper has \(\boldsymbol{\text{changed}}\). The paper is still paper. No new substances are formed, and the amount of mass or matter is the \(\boldsymbol{\text{same}}\). This is a \(\boldsymbol{\text{physical change}}\)."
• "A mixture of salt and water is called a \(\boldsymbol{\text{solution}}\). When you mix salt in water to make a solution, you cannot see the salt (since it dissolves evenly with the \(\boldsymbol{\text{water}}\), but it is still there, 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? \(\boldsymbol{\text{Chemical change}}\) (new substances like ash, carbon dioxide are formed)."