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3 years ago

Which of the following are present both before and after a chemical reaction?

Chemistry

2 answers:

Harrizon [31]3 years ago

5 0

That would be a catalyst, it makes the reaction faster.

valina [46]3 years ago

4 0

Catalysts is wrong because it is never in the chemical equation. It only speeds up the reactions. A is wrong because reactants are only before the chemical reaction. D is wrong because products are only after the chemical reaction. It's C because the energy is still in the molecules and is not lost when it goes through the chemical reaction. Hope this helps! ;)

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lbvjy [14]

Answer:

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Explanation:

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2 years ago

What factors does the gravitational potential energy of an object depend on

AysviL [449]

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3 years ago

Read 2 more answers

Determine the specific heat of a material if a 35. Gram sample absorbed 96. Joules of energy as it was heated from 293 K to 313

podryga [215]

The specific heat of a material is 0.137 J/g°C.

<u>Explanation:</u>

The specific heat formula relates the heat energy required to perform a certain reaction with the mass of the reactants, specific heat and the change in temperature during the reaction.

Q = mcΔT

Here m is the mass, Q is the heat energy required, ΔT is the change in temperature and c is the specific heat.

So, if we have to determine the specific heat of the object, then we have to determine the ratio of heat required to mass of the object with change in time, as shown below.

$c = \frac{Q}{m\ \times\ delta\ T}$

As mass of the object m is given as 35 g and the energy is said to be absorbed so Q = 96 J.

The temperature values given should be changed from kelvin to celsius first. So, initial temperature 293 K will become 293-273.15 = 19.85°C.

Similarly, the final temperature will be 313 - 273.15 = 39.85°C.

Then, ΔT = 39.85-19.85 = 20 °C

Then,

$c = \frac{96}{35 \times 20} =\frac{96}{700} = 0.137 J/g^{o}C$

So, the specific heat of a material is 0.137 J/g°C.

6 0

3 years ago

Which of the following causes a chemical change?

ycow [4]

Distinguish the difference between physical change or chemical change.

Should be C.

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