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blsea [12.9K]
3 years ago
15

Matches=from Chemical energy to light energy+heat energy​

Chemistry
1 answer:
solong [7]3 years ago
7 0

Explanation:

A matchstick has a lot of chemical energy stored in it. When the match is struck, it burns and the chemical energy in it produces heat energy and light energy.

brainliest and follow and thanks

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What does the zeroth law of thermodynamics allow us to define?
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The Zeroth Law of Thermodynamics<span> states that if two bodies are each in thermal equilibrium with some third body, then they are also in equilibrium with each other. Credit: Tim Sharp</span>

5 0
3 years ago
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How many atoms are there in 2.43 g of calcium?
Evgen [1.6K]

Answer:

Explanation:

We're asked to calculate the number of atoms of

Ca

in

153

g Ca

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What we must first do is convert the given mass of calcium to moles of calcium, using its molar mass (referring to a periodic table, this is

40.08

g

mol

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153

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(

1

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, we can calculate the number of atoms present:

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mol Ca

(

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×

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1

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3 0
2 years ago
what temperature change will be observed if a sample of 100 g of ethylene glycol antifreeze solution (specific heat capacity = 3
ivolga24 [154]

Answer:

1°C temperature change will be observed if a sample of 100 g of ethylene glycol antifreeze solution.

Explanation:

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Specific heat capacity of ethylene glycol = c = 3.5 J/g°C

Change in temperature of ethylene glycol = ΔT

Heat loss by the ethylene glycol = Q = 350 J

Q=mc\Delta T

\Delta T=\frac{Q}{mc}=\frac{350 J}{100 g\times 3.5 J/g^oC}

ΔT = 1°C

1°C temperature change will be observed if a sample of 100 g of ethylene glycol antifreeze solution.

3 0
3 years ago
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Lilit [14]
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rate constant= 0.693/half life

so here...

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3 0
3 years ago
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n = mols
C = Concentration or Molarity
V = Volume in Liters.

n = 2
V = 4
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C = 0.5 mol/Litre

8 0
3 years ago
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