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3 years ago

Which of these describes an exothermic reaction?

Chemistry

2 answers:

solong [7]3 years ago

8 0

In Endothermic reactions, energy is absorbed.

GenaCL600 [577]3 years ago

6 0

Answer:

The answer is "Energy is released by the reaction"

Explanation:

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Valence electrons are important because these are the only electrons involved with an atom's

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3 years ago

What is Mg + O2 —> MgO

Agata [3.3K]

Answer:

this is a oxidation reaction

product is magnesium oxide

the balanced equation is

2Mg + O2 -> 2MgO

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3 years ago

A sample of methane gas has a volume of 10 l at a pressure of 1.5 atm and a temperature of 20 °c. what volume does the gas occup

a_sh-v [17]

We can use combined gas laws to solve for the volume of the gas
$\frac{PV}{T}$
where P - pressure, V - volume , T - temperature and k - constant
$\frac{P1V1}{T1} = \frac{P2V2}{T2}$
parameters for the first instance are on the left side and parameters for the second instance are on the right side of the equation
T1 - temperature in Kelvin - 20 °C + 273 = 293 K
T2 - 40 °C + 273 = 313 K
substituting the values
$\frac{1.5 atm*10L}{293 K} = \frac{0.9 atm*V}{313K}$
V = 17.8 L
volume of the gas is 17.8 L

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3 years ago

In the reaction of a carbonyl compound with silver cyanide, the lone pair of electrons on the nitrogen are the one that attack t

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Answer:

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3 years ago

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How many kilojoules are released when 2.25 mol of H2O2 reacts?

Stels [109]

Answer:

230.3 kJ

Some chemical reactions show release of heat while some show absorption of heat. On these bases, the reaction is classified as either endothermic or exothermic. Negative sign of ΔH means exothermic reaction.

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3 years ago