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masha68 [24]
3 years ago
8

A chemistry teacher carried out several demonstrations, and students recorded their observations. For one of the demonstrations,

a student concluded that a physical change took place, but not a chemical change. Which of the following observations could the student have made of the results of the demonstration?
Chemistry
2 answers:
PIT_PIT [208]3 years ago
4 0

Answer:

It demonstrates that it a physical change because you can't see nothing happening but something happening

Sry if it doesn't make sense

taurus [48]3 years ago
3 0

The given question is incomplete. The complete question is:

A chemistry teacher carried out several demonstrations, and students recorded their observations. For one of the demonstrations, a student concluded that a physical change took place, but not a chemical change. Which of the following observations could the student have made of the results of the demonstration?

a) Two colorless solutions were combined, and the resulting solution was pink.

b)  When a solid was added to a liquid, sparks were produced.

c) One piece of solid substance was changed into small pieces.

d) When two solutions were combined, a precipitate formed.

Answer: One piece of solid substance was changed into small pieces.

Explanation:

Physical change is defined as the change in which shape and size of a substance changes, There is no change in the composition of the substance as no new substance is forming. It is usually an reversible reaction.

Chemical change is defined as the change in which a change is the chemical composition takes place resulting in the formation of new substance. It is usually an irreversible reaction.

Indicators showing chemical changes are :

Color change

Characteristic odor

Formation of bubbles

Formation of precipitate

Thus the given change is a physical change as only the physical state i.e. size of solid substance was changed into small pieces.

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Marrrta [24]

Answer:

Ionic bonding happens when an atom of an element gives one or more of its electrons to the other element's atom..it usually takes place between metal and non metal atoms...like in NaCl, Na gives its valence electron to chlorine and completes its own octet. Chlorine accepts the electron and completes its own octet too...but now both the atoms have an opposing charge and hence they attract each other to form an IONIC bond.

Ionic bonds are the strongest of the bonds...here complete transfer of electrons takes place unlike covalent bonds.

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A roller coaster is accelerating at 10m/s² before it comes to an abrupt stop at the end of the ride. The mass of the roller coas
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Answer:

<h2>9000 N</h2>

Explanation:

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3 years ago
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Answer:

Q = 693 J

Explanation:

NaCl (aq) + AgNO₃ (aq) → AgCl (s) + NaNO₃ (aq)

Q = mcΔT

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m: mass

c: specific heat

ΔT: temperature variation

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