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elixir [45]
3 years ago
9

What chemical changes happen at school

Chemistry
1 answer:
kykrilka [37]3 years ago
8 0

Burning, cooking

Explanation:

Chemical changes that happens in school are:

Cooking of meals

 Burning of wastes

 Chemical reactions in laboratories

Rusting of iron used in construction

  • A chemical change is a change that produces new kinds of substances.
  • These changes are usually accompanied by energy and mass changes.
  • Most of such changes are not reversible.

Chemical changes are driven by change in chemical properties of matter.

In a school, iron components might begin to rust. This is a chemical change.

learn more:

Chemical change brainly.com/question/9388643

#learnwithBrainly

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2Mg + O2 -----> 2MgO
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2. When the child is pushed in the toy car, he increases speed. Does he accelerate as he is being pushed?
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A container of hydrogen at 172 kPa was decreased to 85.0 kPa producing a new volume of 3L. What was the original volume?
Aneli [31]

Answer:

<h2>The answer is 1.48 L</h2>

Explanation:

In order to find the original volume we use the same for Boyle's law which is

P_1V_1 = P_2V_2

where

P1 is the initial pressure

P2 is the final pressure

V1 is the initial volume

V2 is the final volume

Since we are finding the original volume

V_1 =  \frac{P_2V_2}{P_1}  \\

From the question

P1 = 172 kPa = 172000 Pa

P2 = 85 kPa = 85000 Pa

V2 = 3 L

We have

V_1 =  \frac{85000 \times 3}{172000}  =  \frac{255000}{172000}  =  \frac{255}{172}  \\  = 1.482558139...

We have the final answer as

<h3>1.48 L</h3>

Hope this helps you

4 0
3 years ago
Qeoahefji
ICE Princess25 [194]

Answer:

B. Experiments

Explanation:

conducting an experiment is an example of a research method while the other choices are not.

Hope I was able to help you!

4 0
2 years ago
As the thermal energy of matter increases, its particles usually spread out, causing
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Answer:

As the thermal energy of matter increases, its particles usually spread out, causing the substance to expand.

Explanation:

<em> i have a book about this stuff</em>

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