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777dan777 [17]
3 years ago
11

Which of these is indication that a chemical reaction has occurred?

Chemistry
2 answers:
Zarrin [17]3 years ago
8 0
I think it's B, the melting of a substance.
trasher [3.6K]3 years ago
3 0
B.melting of a substance
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Write an equation between the carbonate and the acid​
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In general an acid reacts with a carbonate or hydrogen-carbonate to produce a salt, carbon dioxide gas and water.

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the atomic number tells you the number of _______ in one atom of an element. It also tells you the number of ______ in a neutral
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Answer:

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Explanation:

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1. What determines the reactivity of an atom?
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The number of electrons in the outermost shell of an atom determines<span> its </span>reactivity<span>.</span><span>
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3 years ago
A 100.0 g sample of aluminum released 1680 calories when cooled from 100.0c to 20.0 c what is the specific heat of the metal
vovangra [49]

Answer:

The specific heat of aluminium is 0.8792 J/g °C  or 0.21 Cal/g °C

Explanation:

Step 1 : Write formule of specific heat

Q=mcΔT

with Q = heat transfer (J)

with m = mass of the substance

with c = specific heat ⇒ depends on material and phase ( J/g °C)

with ΔT = Change in temperature

For this case :

Q = 1680 Calories = 7033.824 J ( 1 calorie = 4.1868 J)

m = 100.0g

c= has to be determined

ΔT = 100 - 20 = 80°C

<u>Step 2:  Calculating specific heat</u>

⇒ via the formule Q=mcΔT

7033.824 J = 100g * c * 80

7033.824 = 8000 *c

c = 7033.824 /8000

c = 0,879228 J/g °C

or 0.21 Cal / g°C

The specific heat of aluminium is 0.8792 J/g °C  or 0.21 Cal/g °C

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4) Complete the following statement: Different elements...
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Read 2 more answers
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