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leonid [27]
3 years ago
12

Which of the following observations NOT likely describes a chemical change? a A white solid was exposed to ultraviolet light and

turned brown. b Two clear liquids were mixed together and a yellow solid formed c A solid was added to water and the mixture was stirred until the solid was no longer visible d A piece of metal was added to a liquid and bubbles formed on the surface of the metal
Chemistry
1 answer:
kiruha [24]3 years ago
7 0

Answer:

The correct answer would be - c.  A solid was added to water and the mixture was stirred until the solid was no longer visible

Explanation:

Photostabalizing is the process where a solid change its color in the presence of ultraviolet light, it is a chemical change, so the first option would not be the correct answer.

when two liquid or aqueous solutions are mixed together and form a solid substance, this reaction is known as precipitation and it is a chemical reaction too.

When a solid is placed in a liquid and after stirring it makes the solid vanish is a physical change known as dissolving character.

Thus, the correct answer is option C.

You might be interested in
An air conditioning unit turns off once it reaches its goal temperature. The house warms up and the air conditioning unit turns
-Dominant- [34]

Answer:

D ) feedback

Explanation:

When we use an air conditioner, it get turn off when reaches its required temperature and when the house warm up the air conditioning unit turns on again, that is an example of feedback.

The given condition is an example of negative feedback because in negative feedback, any change in the input is opposed by generating an output. Here also,  warming up of house (change in one direction) allows the air conditioning unit turns  on and it gives cool air (opposing that change).

Hence, the correct option is "D".

4 0
3 years ago
Which ansewrd is it I think that is <br> C OR D<br> A<br> B<br> C<br> D
Lostsunrise [7]

It would be D Because the earth orbits the sun

8 0
3 years ago
Substances can be categorised in two ways: as an element, mixture or compound ora as a solid, liquid or gas. which
adoni [48]

Answer:

Most substances on earth are compounds and most interesting chemistry is done with compounds. Most interesting chemistry is done with mixtures of compounds although they often start with pure compounds and then do reactions as mixtures. Most chemistry is carried out in liquid solutions made up of compounds that are solids, liquids, or gases in their pure form.

Explanation:

6 0
2 years ago
Read 2 more answers
Strontium has a atomic number of 38 and a mass number of 88 how many neutrons are in one atom
dem82 [27]
Atomic number=number of protons (and electrons, but that doesn't matter in this answer)
Atomic mass=number of protons+number of neutrons
Atomic mass=atomic number+number of neutrons
Atomic mass-atomic number=number of neutrons
88-38=number of neutrons
number of neutrons=50
6 0
3 years ago
Read 2 more answers
The question is a picture pls help
Hoochie [10]

The unknown alcohol = 2-propanol

<h3>Further explanation</h3>

Given

volume = 50 ml

mass = 39.4 g

Required

The unknown alcohol

Solution

Density of sample :

= mass : volume

= 39.4 g : 50 ml

= 0.788 g/ml

The unknown alcohol at room temperature = liquid, so the unknown alcohol is 2-propanol because it has temperature range between -90 to 82 for liquid and the density = 0.788 g/ml

6 0
2 years ago
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