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oksian1 [2.3K]
3 years ago
13

How many valence electrons are in potassium

Chemistry
1 answer:
klasskru [66]3 years ago
3 0

One because Potassium is in the first column on the periodic table. Any element in the first column on the periodic table has one valence electron in their outer shell.

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45.5 g of ice is heated from -25 degrees celsius to 150 degrees celcius. Calculate the total amount of heat required for the ent
tino4ka555 [31]

Answer:

Q = 16163.88 Joules

Explanation:

Given the following data;

Initial temperature, T1 = -25°C

Final temperature, T2 = 150°C

Mass = 45.5 g

Specific heat capacity of ice = 2.03 J/g°C

To find the quantity of heat required;

Heat capacity is given by the formula;

Q = mcdt

Where;

Q represents the heat capacity or quantity of heat.

m represents the mass of an object.

c represents the specific heat capacity of water.

dt represents the change in temperature.

dt = T2 - T1

dt = 150 - (-25)

dt = 150 + 25

dt = 175°C

Substituting into the formula, we have;

Q = 45.5 * 2.03 * 175

Q = 16163.88 Joules

4 0
3 years ago
A typical volume leaving the large intestine might be 140 mL. If the volume exiting the large intestine were 364 mL, then it wou
RUDIKE [14]

If the volume exiting the large intestine were 364 mL, then it would most likely indicate a case of diarrhea. This condition may lead to dehydration.

<h3>Diarrhea: causes and diagnosis</h3>

Diarrhea is an unhealthy condition that occurs when the body excretes an excessive amount of water.

Diarrhea must be treated because this condition can lead to dehydration (it may even lead to death in severe cases).

Both diarrhea and vomiting may lead to the loss of body fluids.

Learn more about diarrhea dehydration here:

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6 0
3 years ago
1. Water is an amphoteric substance. In any sample of water some of the moles
umka2103 [35]

Answer:

2H₂O (l) ⇄ H₃O⁺ (aq)  +  OH⁻(aq)

Explanation:

The autoionization of water is defined as a chemical reaction where there is an equilibrium in which two water molecules react producing an hydronium ion and a hydroxide ion. This is also defined as the autoprotolysis of water, and is based on its amphoteric nature.

The substance that can donate protons as well as receive them is defined as amphoteric. In this way, the water behaves amphoteric as it donates a proton as an acid of Brownsted Lowry or if it receives a proton, being a base.

NH₃ + H₂O ⇄ NH₄ + OH⁻               Kb

In this case, water behaves as an acid, it donates the proton to ammonia (a base)

CH₃COOH + H₂O ⇄ CH₃COO⁻ + H₃O⁺              Ka

For this case, water behaves as a base, it recieves the proton from the acetic acid (acid)

4 0
3 years ago
10.7g of C2H2 --&gt; g CO2
kicyunya [14]

Answer:

http://www.khalidshadid.com/uploads/3/9/2/0/3920808/raymond_chang-chemistry_10th_edition.pdf

Explanation:

http://www.khalidshadid.com/uploads/3/9/2/0/3920808/raymond_chang-chemistry_10th_edition.pdf

5 0
3 years ago
What is the meaning of polyatomic
Svetllana [295]

Explanation:

consisting of many atoms is known as polyatomic

6 0
4 years ago
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