CHEMISTRY HIGH SCHOOL

Which substances dissolves in pure water and produces a solution that is a good conductor of electricity?1) CaCl2
2) C6H12O6
3) N2
4) O2

Answers

Answer 1
Answer:

Answer:

CaCl_2

Explanation:

We have to keep in mind that a good conductor would be a substance that has the ability to produce ions (charged species). These species are responsible for the electricity conduction on water.

Therefore, we have to check which ones of these compounds will produce ions in water. For N_2 and O_2 we have diatomic molecules (also gases) this type of molecules don't have the ability to produce ions due to his simplicity, they already are very stable.

In the sugar molecule C_6H_12O_6 we have a covalent compound. The ions are produced by ionic compounds. So, this molecule can be discarded too.

For CaCl_2 we have an ionic compound that have the ability to produce ions:

CaCl_2~~->~~Ca^+^2~+~2Cl^-

So, this is the compound that would be a good conductor due to the Ca^+^2 and the Cl^- ions.
Answer 2
Answer: CaCl2 is a good conductor of electricity when dissolved in water.

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B.
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Answers

ok i'm not really sure I guess is b

A solution of KCIO3 is prepared using 75 grams of the solute in enough water to make 0.250 liters of solution. The gram-formula mass of KCIO3 is 122 grams per mole.-- Determine the percent by mass of solute in the solution.

Answers

The mass percent of the solute present is 99.7%.

What is mass percent?

The term mass percent refers to the ratio of the mass of solute to the mass of the solution multiplied by 100.

We have the following information;

volume of the water = 0.250 liters

Mass of the water = 0.250 g

Mass of the solute = 75 grams

Mas of solute and  solvent = 0.250 g + 75 grams = 75.250 g

Mass percent of the solute = 75 grams /75.250 g * 100 = 99.7%

Learn more about mass percent: brainly.com/question/1190311
Using the mass/volume percentage method for percentages of the solution, you simply divide the grams of solute by the volume of the solution and multiply by 100 to get your percentage.
(75.0g/250mL)•100 = 30.0% solute

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(2) A catalyst limits the amount of reactants used.
(3) A catalyst changes the kinds of products produced.
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Answers

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Answers

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To form a solution, ________. A. substance must dissolve in another
B. a solid must dissolve in a liquid
C. the solvent must be water
D. a gas must dissolve in a liquid

Answers

To form a solution, a substance must dissolve in another. The correct answer will be A. 

Answer:

1.A

2.A

3.A

4.A

100% RIGHT

Explanation:

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Answers

If it existed it would be gold(II) oxide. The stable gold oxide is gold(III) oxide Au2O3
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