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aleksklad [387]
3 years ago
10

PLEASE HELP WITH CHEM CLASS!!!!! Please please please !! Explain depth. Please !!!!

Chemistry
1 answer:
Sedaia [141]3 years ago
6 0

Answer:

The answers to your questions are given below

Explanation:

1. KClO3 => Potassium trioxochlorate (V)

Thermal decomposition of KClO3.

When we heat potassium trioxochlorate (V), KClO3, it will slip into two producing potassium chloride, KCl and oxygen gas, O2 as shown below:

2KClO3(s) —> 2KCl(s) + 3O2(g)

Note: the above reaction will occur faster and at a lower temperature in the presence of manganese (iv) oxide as catalyst.

2a. Determination of the number protons and neutrons in Nitrogen–14.

Nitrogen–14 has the following:

Mass number = 14

Atomic number = 7

Proton =?

Neutron =?

Atomic number of an atom is simply the proton number. Therefore,

Proton = Atomic number

Atomic number = 7

Proton = Atomic number = 7

Proton = 7

Mass number = Proton + Neutron

Mass number = 14

Proton = 7

Neutron =?

14 = 7 + Neutron

Collect like terms

Neutron = 14 – 7

Neutron = 7

Therefore, Nitrogen–14 has 7 protons and 7 neutrons.

2b. Determination of the number protons and neutrons in Nitrogen–15.

Nitrogen–15 has the following:

Mass number = 15

Atomic number = 7

Proton =?

Neutron =?

Atomic number of an atom is simply the proton number. Therefore,

Proton = Atomic number

Atomic number = 7

Proton = Atomic number = 7

Proton = 7

Mass number = Proton + Neutron

Mass number = 15

Proton = 7

Neutron =?

15 = 7 + Neutron

Collect like terms

Neutron = 15 – 7

Neutron = 8

Therefore, Nitrogen–15 has 7 protons and 8 neutrons.

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For each of the esters provided, identify the alcohol and the carboxylic acid that reacted.
Veronika [31]

Answer:

52. The alcohol USED => methanol, CH3OH

The carboxylic acid USED => propanoic acid, CH3CH2COOH.

53. The alcohol USED => Ethanol, CH2CH3OH

The carboxylic acid USED => Formic acid, HCOOH.

Explanation:

52. To obtain Methyl propanoate, CH3CH2COOCH3, we simply react propanoic, CH3CH2COOH and methanol, CH3OH together as shown below:

CH3CH2COOH + CH3OH —> CH3CH2COOCH3 + H2O

The alcohol used: methanol, CH3OH

The carboxylic acid used: propanoic acid, CH3CH2COOH.

53. To obtain Ethyl methanoate, HCOOCH2CH3, we simply react

Formic acid, HCOOH and ethanol, CH3CH2OH together as show below:

HCOOH + CH3CH2OH —> HCOOCH2CH3 + H2O

The alcohol USED => Ethanol, CH2CH3OH

The carboxylic acid USED => Formic acid, HCOOH.

7 0
3 years ago
7. How many moles are in 5 x 10 2 atoms of gold?
goblinko [34]

Answer:

8.3028894e-22

Explanation:

5x10^2 atoms/1 x 1 mol/6.022x10^23

7 0
3 years ago
What happens when a crystal potassium nitrate is added to a saturated solution as it cooled
coldgirl [10]
Crystals will begin to form. crystals form from c<span>ertain molecules in the liquid gather together as they attempt to become stable. they </span>do<span> this in a uniform and repeating pattern that </span>forms<span> the </span>crystal<span>.in nature, </span>crystals<span> can </span>form<span> when liquid rock, called magma, cools.if it cools slowly then </span>crystals<span> may</span>form<span>.</span>  hope it helps :)
3 0
3 years ago
A. 207 kJ<br> B. 4730 kJ<br> C. 9460 kJ<br> D. 414 kJ
MrMuchimi

Answer:

Q = 9460 Kj

Explanation:

Given data:

Mass of copper = 2kg

Latent heat of vaporization = 4730 Kj/Kg

Energy required to vaporize 2kg copper = ?

Solution:

Equation

Q= mLvap

It is given that heat required to vaporize the one kilogram copper is 4730 Kj thus, for 2 kg

by putting values,

Q= 2kg ×  4730 Kj/Kg

Q = 9460 Kj

6 0
3 years ago
CHEM QUESTION "What is the pH of a substance with a hydrogen ion concentration...
Ipatiy [6.2K]

Answer:

Hydrogen ion concentration is more conveniently expressed as pH, which is the logarithm of the reciprocal of the hydrogen ion concentration in gram moles per liter. 

Explanation:

Thus, in a neutral solution the hydrogen ion (H+) and the hydroxyl ion (OH−) concentrations are equal, and each is equal to 10−7. A pH of 7 is neutral.

7 0
3 years ago
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