CHEMISTRY HIGH SCHOOL

Which substance is an electrolyte?

(1) O2
(2) Xe
(3) C3H8
(4) KNO3

Answers

Answer 1

Answer:

(1) O2 Is a Nonelectrolyte: because it does not ionize when dissolved in a solution

(2) Xe Is a Nonelectrolyte: because it does not ionize when dissolved in a solution

(3) C3H8 Is a Nonelectrolyte: because it does not ionize when dissolved in a solution

(4) KNO3 Is an electrolyte: because it ionizes when dissolved in a solution

Electrolytes:

Electrolytes are the substance whose aqueous solution conducts electricity. These are mainly two types:

1. Strong electrolytes

2. Weak electrolytes:

Strong electrolytes:

Strong electrolytes have following properties:

1. They are ionic compounds.

2. They are completely separates into their ions when dissolved in water.

3. In solution form they conduct electricity due to present of ions but in solid form means neutral molecule does not conduct electricity.

Weak electrolytes:

Weak electrolytes are partially ionizes in water.

In general strong electrolytes are strong acid and strong base while weak electrolytes are weak acid and weak bases.

Nonelectrolyte:

The substance which does not ionize when dissolved in a solution is called non-electrolyte. It is a poor conductor of electricity.

Answer 2

Answer: KNO3 is an electrolyte. The reason being it has low vapor pressure than water(at same temperature). All strong acids, strong bases and salts which are highly soluble make strong electrolytes. Hope it helps.

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Calculate the number of atoms needed to balance the following equation: CaCO3+HCl->CO2+H2O+CaCl. (Number 3 on my paper)

Answers

Answer:

CaCO3 + 2HCL -> CO2 +H2O + CaCl2

Explanation:

When balancing an equation, it is important to first ensure that the chemical formulas in the equation are correct. In the above equation, the first modification required is for CaCl to be corrected to CaCl2. This is because the calcium ion has a charge of 2+ which has to be balanced by 2 chloride ions, each of charge 1-

Next, the overall atoms of the equations should be balanced. The number of atoms of each element on the side of reactants should be equal to their number on the side of the products. In this case, the number of HCL molecules should be 2.

Before balancing equation:

Reactants: Ca: 1, C: 1, O: 3, H: 1, Cl: 1

Products: Ca: 1, C: 1, O: 3, H: 2, Cl: 1

After balancing equation:

Reactants: Ca: 1, C: 1, O: 3, H: 2, Cl: 2

Products: Ca: 1, C: 1, O: 3, H: 2, Cl: 2

Your question is wrong CaCl2 is correct
:CaCO3+2HCl---> CO2+ H2O+CaCl2

What is the average kinetic energy of 1 mole of a gas that is at 100 degrees Celsius?

Answers

To simplify our solutions, we have to assume that the gas we are referring is ideal. The kinetic energy of of ideal gas is a funtion of moles and temperature only.
KE = (3/2)(nRT)
= (3/2)(1mol)(8.314J/molK)(100+273.15) = 4204.6J

A chemical reaction in which compounds break up into simpler constituents is a _______ reaction.a. combination
b. decomposition
c. double replacement
d. substitution

Answers

the awnser to ur question is B

B. Decomposition, I remember reading this in my student workbook. Hope this helped!

What happens to the particles when a pure substance melts

Answers

When a pure substance melts, the particles are separated. That is because a liquid tends to have particles that are loosely held, while a solid's particles are squished together.

The process of converting a liquid to a gas is calledcondensation

evaporation

deposition

sublimation