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tatyana61 [14]
1 year ago
6

Write a balanced equation for each reaction:(b) Combustion of calcium in air

Chemistry
1 answer:
Lostsunrise [7]1 year ago
7 0

The correct answer is 2Ca(s)+O_2(g)→ 2CaO(s).

Combustion of calcium  in air calcium is Ca with O_2 (air)

Thus the equation is:

2Ca(s)+O_2(g)→ 2CaO(s)

Calcium and oxygen react at room temperature to generate a thin layer of CaO that shields the metal from further oxidation. When burned, calcium may ignite and react with both oxygen and nitrogen to produce calcium oxide (CaO) and calcium nitride (Ca3N2).

What is combination reaction ?

A chemical reaction known as a "combination reaction" occurs when two or more reactants combine to create a single product. Such a kind of reaction does not produce any byproducts. These processes are typically exothermic, which means heat is produced.

To learn more about combustion refer the link:

brainly.com/question/9641392

#SPJ4

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4 years ago
Telluric acid (H2TeH4O6) is a diprotic acid with Ka1 = 2.0x10-8 and Ka2 = 1.0x10-11. A 0.25 M H2TeH4O6 contains enough HCl so th
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Answer:

5x10⁻⁶ = [HTeH₄O₆⁺]

Explanation:

The first dissociation equilibrium of the telluric acid in water is:

H₂TeH₄O₆ + H₂O ⇄ HTeH₄O₆⁺ + H₃O⁺

Using H-H equation for telluric acid:

<em>pH = pKa + log₁₀ [HTeH₄O₆⁺] / [H₂TeH₄O₆]</em>

pKa of telluric acid is -logKa1

pKa = -log 2.0x10⁻⁸

pKa = 7.699

As concentration of [H₂TeH₄O₆] is 0.25M, replacing in H-H equation:

3.00 = 7.699+ log₁₀ [HTeH₄O₆⁺] / [0.25M]

-4.699 = log₁₀ [HTeH₄O₆⁺] / [0.25M]

2x10⁻⁵ = [HTeH₄O₆⁺] / [0.25M]

<h3>5x10⁻⁶ = [HTeH₄O₆⁺]</h3>

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Answer:

Explanation:

D

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If 585.24 Joules of heat are added to 53.2 grams of water at 24.15oC, what will the new temp. be?
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E = mct
Energy = (mass) x (specific heat capacity of water) x (change in temp)

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