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Sergeeva-Olga [200]
2 years ago
6

A chemical reaction that takes in heat is called: exothermic endothermic a phase change

Chemistry
2 answers:
notka56 [123]2 years ago
8 0

Hello! Here is the answer: Endothermic I hope this helped. Your fellow Brainly user, GalaxyGamingKitty

AlladinOne [14]2 years ago
7 0
It would be Endothermic. 
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Calculate the percentage of water in the hydrate manganese (ii) nitrate tetrahydrate
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Divide the mass of the water lost by the mass of hydrate and multiply by 100.

Explanation:

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Calcium hydroxide has the formula Ca(OH)2.
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In the commercial manufacture of nitric acid, how many liters of nitrogen dioxide will produce 30 liters of nitric oxide given t
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5 0
2 years ago
Given the thermochemical equations below, What is the standard heat of formation of CuO(s)? 2 Cu2O(s) + O2(g) ---> 4 CuO(s) ∆
OlgaM077 [116]

-130KJ is the standard heat of formation of CuO.

Explanation:

The standard heat of formation or enthalpy change can be calculated by using the formula:

standard heat of formation of reaction = standard enthalpy of formation of product - sum of enthalpy of product formation

Data given:

Cu2O(s) ---> CuO(s) + Cu(s) ∆H° = 11.3 kJ

2 Cu2O(s) + O2(g) ---> 4 CuO(s) ∆H° = -287.9 kJ

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When 1 mole Cu20 undergoes combustion 1/2 moles of oxygen is consumed.

Cu20 + 1/2 02 ⇒ 2CuO (I/2 of 238.7 KJ) or 119.35 KJ

So standard heat of formation of  formation of Cu0 as:

Cu + 1/2 02 ⇒ CuO

putting the values in the equation

ΔHf = ΔH1 + ΔH2     (ΔH1 + ΔH2  enthalapy of reactants)

heat of formation = -11.3 + (-119.35)

                            = - 130.65kJ

-130.65 KJ is the heat of formation of CuO in the given reaction.

7 0
3 years ago
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