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2 years ago

Describe a chemical test for water-

Chemistry

1 answer:

Mila [183]2 years ago

6 0

Answer:

Anhydrous copper (II) sulphate is white because it has no water in it. When drops of water are added, copper (II) sulphate turns blue. This colour change can be used to detect the presence of water (or water vapour).

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Do yeast need air to release carbon dioxide?

nasty-shy [4]

Yes because if you don't it might blow up I forgot what would happen

4 0

3 years ago

There are two steps in the usual industrial preparation of acrylic acid, the immediate precursor of several useful plastics. In

qaws [65]

The question is incomplete, here is the complete question:

There are two steps in the usual industrial preparation of acrylic acid, the immediate precursor of several useful plastics. In the first step, calcium carbide and water react to form acetylene and calcium hydroxide:

$CaC_2(s)+2H_2O(g)\rightarrow C_2H_2(g)+Ca(OH)_2(s)$

In the second step, acetylene, carbon dioxide and water react to form acrylic acid:

$6C_2H_2(g)+3CO_2(g)+4H_2O(g)\rightarrow 5CH_2CHCO_2H(g)$

Write the net chemical equation for the production of acrylic acid from calcium carbide, water and carbon dioxide. Be sure your equation is balanced.

Answer: The net chemical equation is written below.

Explanation:

The intermediate balanced chemical reaction are:

(1) $CaC_2(s)+2H_2O(g)\rightarrow C_2H_2(g)+Ca(OH)_2(s)$ ( × 6 )

(2) $6C_2H_2(g)+3CO_2(g)+4H_2O(g)\rightarrow 5CH_2CHCO_2H(g)$

To omit acetylene from the net chemical reaction, we multiply Equation (1) by 6.

Equation 1: $6CaC_2(s)+12H_2O(g)\rightarrow 6C_2H_2(g)+6Ca(OH)_2(s)$

Equation 2: $6C_2H_2(g)+3CO_2(g)+4H_2O(g)\rightarrow 5CH_2CHCO_2H(g)$

Net chemical equation: $6CaC_2(s)+3CO_2(g)+16H_2O(g)\rightarrow 5CH_2CHCO_2H(g)+6Ca(OH)_2(s)$

Hence, the net chemical equation is written above.

6 0

3 years ago

The starting molecule for the krebs cycle is

Delicious77 [7]

Answer:

acetyl CoA

Explanation:

The starting molecule for the krebs cycle is acetyl CoA.

3 0

4 years ago

Which of the following instruments is used to measure air pressure

kipiarov [429]

A barometer measures air pressure.

8 0

4 years ago

What is the molality of a solution consisting of 44.0 mL of benzene (C₆H₆; d = 0.877 g/mL) in 167 mL of hexane (C₆H₁₄;d = 0.660

STALIN [3.7K]

Molarityof the solution will be 907.35 m.

<h3>What is Molality?</h3>

Molaity is the no. Of moles of an compound is present in 1 kg solution .

Molality= no.0f moles / mass of the solution (in kg)

The SI unit of molality is m .

We have given here ,

Volume of benzene= 44.0ml

Density of benzene =0.877g/ mol

Volume of hexane =167 ml

Density of hexane =0.660g/ mol

Mass of benzene = 44×0.877

. →38.588 g

Mass of hexane→167×660

. → 110.220g

mass of the solution→148.808g

molar mass of the solution→78+ 86

. →164g/ mol

Molality = 148.808/ 164×1000

→907.35m

So , molality will be 907.35 m

to learn more about Molality click here brainly.com/question/26921570

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7 0

2 years ago