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3 years ago

Why can’t elements be separated into smaller parts using chemical means?

1 answer:

4 0

Why can't elements be separated into smaller parts using chemical means? Too much energy is required, since you'd have to break them down into protons, neutrons, and electrons. You can get this much energy together with nuclear reactions, but not by chemical means.

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Which state of matter would be described as having highly energized, charged particles that move extremely fast

uranmaximum [27]

There are four states of matter, solid, liquid, gas and plasma. Their formation is as when solid is heated it converts into liquid, liquid on heating converts into gases and gases on heating converts into plasma.

Plasma:
Plasma is the fourth state of matter. It is the highest energy state of matter.

Composition:
Plasma is made up of negatively charged and positively charged particles.

Result:
The answer to your question is Plasma.

8 0

3 years ago

For Na2HPO4:(( (Note that for H3PO4, ka1= 6.9x10-3, ka2 = 6.4x10-8, ka3 = 4.8x10-13 ) a) The active anion is H2PO4- b) The activ

Komok [63]

Answer:

Check the explanation

Explanation:

Answer – Given, $H_3PO_4$ acid and there are three Ka values

$K_{a1}=6.9x10^8, K_{a2} = 6.2X10^8, and K_{a3}=4.8X10^{13}$

The transformation of $H_2PO_4- (aq) to HPO_4^2-(aq)$ is the second dissociation, so we need to use the Ka2 = 6.2x10-8 in the Henderson-Hasselbalch equation.

Mass of KH2PO4 = 22.0 g , mass of Na2HPO4 = 32.0 g , volume = 1.00 L

First we need to calculate moles of each

Moles of KH2PO4 = 22.0 g / 136.08 g.mol-1

= 0.162 moles

Moles of Na2HPO4 = 32.0 g /141.96 g.mol-1

= 0.225 moles

[H2PO4-] = 0.162 moles / 1.00 L = 0.162 M

[HPO42-] = 0.225 moles / 1.00 L = 0.225 M

Now we need to calculate the pKa2

pKa2 = -log Ka

= -log 6.2x10-8

= 7.21

We know Henderson-Hasselbalch equation

pH = pKa + log [conjugate base] / [acid]

pH = 7.21 + log 0.225 / 0.162

= 7.35

The pH of a buffer solution obtained by dissolving 22.0 g of KH2PO4 and 32.0 g of Na2HPO4 in water and then diluting to 1.00 L is 7.35

6 0

3 years ago

6. A box measures 11.25 inches in length, 8.1 inches in width and 6.85 inches in height. What is the

denis23 [38]

Answer:

I'd say 624.2^3 inches.

Explanation:

3 0

3 years ago

Which characteristic could distinguish a crystalline solid from an amorphous

Mrac [35]

Answer:

The way it breaks

Explanation:

a-p-e-x

8 0

3 years ago

What mass of naoh (40.0 g/mol) is needed to prepare 250 ml of 2 m naoh solution?

laila [671]

20 grams is probably the mass

6 0

3 years ago