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OleMash [197]
3 years ago
14

Which of the following will result in a chemical change?

Chemistry
1 answer:
Zarrin [17]3 years ago
5 0
The answer would be C. because if you burn coal can you get the same piece of coal back?

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What are 5 physical changes in matter
Gennadij [26K]

Answer:

cutting, bending, dissolving, freezing, and boiling

Explanation:

A physical change is a change in one or more physical properties of matter without any change in chemical properties. In other words, matter doesn't change into a different substance in a physical change. Examples of physical change include but are not limited to, from solid to liquid or from liquid to gas are also physical changes.

3 0
3 years ago
What is the answer helpnme plz
kykrilka [37]
MgH2 + 2 H2O → Mg(OH)2 + 2 H2
8 0
2 years ago
If the chemist mistakenly makes 250 mL of solution instead of the 200 mL, what molar concentration of sodium nitrate will the ch
Evgesh-ka [11]

Answer:

0.120M is the concentration of the solution

Explanation:

<em>Assuming the mass of sodium nitrate dissolved was 2.552g</em>

<em />

Molar concentration is an unit of concentration widely used in chemsitry defined as the moles of solute (In this case NaNO3) in 1L of solution.

To find this question we must find the moles of NaNO3 in 2.552g. With this mass and the volume (250mL = 0.250L) we can find molar concentration as follows:

<em>Moles NaNO3 -Molar mass: 84.99g/mol-</em>

2.552g * (1mol / 84.99g) = 0.0300 moles NaNO3

<em>Molar concentration:</em>

0.0300 moles NaNO3 / 0.250L =

<h3>0.120M is the concentration of the solution</h3>
7 0
3 years ago
Determine the mechanical energy of this object: a 1-kg ball sits on a 10-meter high cliff.
Bond [772]
Mechanical energy = mass x acceleration due to gravity x height 
                               =     1x9.8x10 = 98J
8 0
3 years ago
Read 2 more answers
Why is it useful to know the background level of extinction?
lawyer [7]

Answer:

NOAA and FWS are required by law to compare background rates to current rates.

Explanation:

5 0
3 years ago
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