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3 years ago

What does corona mean?

Chemistry

2 answers:

erma4kov [3.2K]3 years ago

6 0

Answer:

a part of a body that's resembling or just linked to a crown

Bezzdna [24]3 years ago

4 0

Answer:

Explanation:

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Even when an object appears to be at rest, its atoms and molecules are in constant motion

natita [175]

Answer:

the answer is True

Explanation:

the answer is True

5 0

3 years ago

Based on the results of testing colorless solutions with indicators, which solution is most acidic?

sertanlavr [38]

A solution in which methyl orange is red indicates the most acidic substance.

<h3>What is an Indicator?</h3>

This is defined as a substance that gives a visible sign, usually by a colour change when a chemical species is added.

On litmus paper, the redder the color is, the more acidic it is which was why methyl orange changing to darker red signifies most acidity.

Read more about Indicator here brainly.com/question/1918667

5 0

3 years ago

You need to produce a buffer solution that has a pH of 5.50. You already have a solution that contains 10 mmol (millimoles) of a

balandron [24]

Answer:

56.9 mmoles of acetate are required in this buffer

Explanation:

To solve this, we can think in the Henderson Hasselbach equation:

pH = pKa + log ([CH₃COO⁻] / [CH₃COOH])

To make the buffer we know:

CH₃COOH + H₂O ⇄ CH₃COO⁻ + H₃O⁺ Ka

We know that Ka from acetic acid is: 1.8×10⁻⁵

pKa = - log Ka

pKa = 4.74

We replace data:

5.5 = 4.74 + log ([acetate] / 10 mmol)

5.5 - 4.74 = log ([acetate] / 10 mmol)

0.755 = log ([acetate] / 10 mmol)

10⁰'⁷⁵⁵ = ([acetate] / 10 mmol)

5.69 = ([acetate] / 10 mmol)

5.69 . 10 = [acetate] → 56.9 mmoles

6 0

3 years ago

Balance this equation by filling in the missing coefficient: 6 CO2 + 6 H2O + Sunlight = C6H12O6 + ?? O2

Mila [183]

Given that,

The equation is : $6CO_2+6H_2O+\text{sunlight}\rightarrow C_6H_{12}O_6+?O_2$

To find,

The missing coefficients.

Solution,

$6CO_2+6H_2O+\text{sunlight}\rightarrow C_6H_{12}O_6+?O_2$

Let the value of ? is x.

It is the equation of photosynthesis.

In LHS,

Carbon atoms = 6

Hydrogen atom = 12

Oxygen atom = 18

In RHS,

Carbon atoms = 6

Hydrogen atom = 12

Oxygen atom = 6

If we make the equation as $6CO_2+6H_2O+\text{sunlight}\rightarrow C_6H_{12}O_6+6O_2$

No the number of atoms in RHS = 6+ 12 = 18

It means if we take the value of ? as 6 the equation will be balanced.

Hence, the correct option is (B) "6".

8 0

3 years ago

The stopcock connecting a 4.87 L bulb containing hydrogen gas at a pressure of 4.38 atm, and a 4.87 L bulb containing argon gas

andrew-mc [135]

Answer:

P = 3,63 atm

Explanation:

Using PV=nRT and knowing the temperature in the problem remains constant it is possible to rewrite this formula, thus:

PV = kn, where k is RT (Constant), P is pressure, V is volume and n are moles.

The first bulb contains:

4,87L×4,38atm = 21,3k moles

And the second bulb:

4,87L×2,90atm = 14,1k moles

When gases are mixed, the total moles are:

21,3k moles + 14,1k moles = <em>35,4k moles</em>

As total volume is 4,87L + 4,87L = <em>9,74L</em>

Replacing:

P = kn/V

P = 35,4k moles / 9,74L

I hope it helps!

7 0

3 years ago