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Scilla [17]
3 years ago
7

Hello rainfaeries ~help me with these questions ​

Chemistry
2 answers:
zimovet [89]3 years ago
7 0

Answer:

<h2>#7</h2>

Ans) Calcium hydroxide is produced by the reaction of water and calcium oxide also called slaked lime.

CaO + H2O → Ca(OH)

<h2>#8</h2>

Ans) When Calcium Hydroxide reacts with water (H2O) and absorbs carbon dioxide (CO2) from the environment, it produces Calcium Carbonate (CaCO3), which creates a hard coating on the walls. That's why Calcium Hydroxide is used in white washing.

goblinko [34]3 years ago
4 0

Explanation:

Calcium hydroxide is produced commercially by treating lime with water: CaO + H2O → Ca(OH) In the laboratory it can be prepared by mixing aqueous solutions of calcium chloride and sodium hydroxide.

Quicklime is used for whitewashing as it produces calcium hydroxide (CaOH) when it reacts with water (H2O) and absorbs carbon dioxide (CO2) from the environment, as a result, it produces calcium carbonate (CaCO3) which creates a hard coating on the walls.

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Answer:

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Explanation:

We are given;

  • Mass of titanium = 3.6 pounds

We are required to determine the volume of titanium in cubic inches

  • We need to know the density of titanium;

Density of titanium = 4.51 g/cm^3

1 pound = 453.592 g

therefore, 3.6 pound = (3.6 × 453.592 g per pound)

                                   = 1632.93 g

Therefore;

Volume = Mass ÷ density

             = 1632.93 g ÷ 4.51 g/cm^3

             = 362.069 cm³

But, 1 in³ = 16.387 cm³

Therefore;

Volume =  362.069 cm³ ÷ 16.387 cm³ per in³

             = 22.095 in³

             = 22 in³

Thus the volume of titanium is 22 cubic inches

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