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Consider the following two events: #1: A clear liquid is poured into another, different clear liquid,...

Consider the following two events:

#1: A clear liquid is poured into another, different clear liquid, and a white, flaky solid substance appears while the system gets warmer

            #2: A glass containing sea water is left in the sun on a warm summer day. After the water evaporates, crystalized salt is left behind in the glass.

Which of these events are physical changes and which are chemical reactions?

A.

#1 is a physical change and #2 is a chemical reaction
B.

#1 is a chemical change and #2 is a physical change
C.

Both #1 and #2 are physical changes
D.

Both #1 and #2 are chemical reactions
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Answer #1

1. Here , a new substance is formed with a change in temperature which signifies heat change ,this is a sign of a chemical change thus number 1 is a chemical change

2. Here there is only separation of two substance (salt + water) in sea water is involved thus , no new substance formed , it is a physical change only

Thus B is correct

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