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Naddik [55]
3 years ago
11

Which activity is an example of a chemical change?

Physics
2 answers:
saul85 [17]3 years ago
5 0

C lighting a match is a chemical reaction


melomori [17]3 years ago
3 0

The answer is C because when the chemicals on the tip of a match are heated up from friction it ignites.

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What quantity of heat is required to change 20g of ice at -25°c to steam at 120°c
Oksana_A [137]

Answer: 5289 joules

Explanation:

The quantity of Heat Energy (Q) required to heat a substance depends on its Mass (M), specific heat capacity (C) and change in temperature (Φ)

Thus, Q = MCΦ

Since, Mass of ice = 20 g

C is not provided (Recall that the specific heat capacity of ice is 2.010J/g°C)

Φ = (Final temperature - Initial temperature)

(120°C - (-25°C) =

120°C + 25°C = 145°C

Thus, Q = 20g x 2.010J/g°C x 145°C

Q= 5829J

Thus, 5829Joules of heat energy is required to heat ice

6 0
3 years ago
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gregori [183]
<span>During an exothermic process [heat flows from the system to the surroundings]. Exo roughly translates to outside, and thermic refers to heat. Heat is released from a system to its surroundings during an exothermic reaction, so the system would actually feel warm to the touch. The opposite of this is called and endothermic reaction.</span>
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3 years ago
The question is on the picture
Firlakuza [10]

Answer:

<em> think 2 also if not im so sorry  but i think it is :)</em>

7 0
2 years ago
Is it possible for a gas contained in a chamber to maintain a constant temperature while heat is being added to the gas? Explain
Evgesh-ka [11]

Answer:Yes

Explanation:

Yes it is possible for a gas contained in a chamber to maintain a constant temperature while heat is being added to the gas.A process in which temperature of the gas remains constant is called Isothermal Process.For an ideal internal energy is a function of temperature therefore internal energy remains constant while all the heat added is converted to do the work done by the system.

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What does the 2 mean in the formula 5Mg3(PO4)2?
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