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4 years ago

Becquerel made a hypothesis that fluorescent minerals give off

Chemistry

1 answer:

masha68 [24]4 years ago

8 0

X Rays. Hope that helped! :)

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What is the shortest half life

N76 [4]

Answer:

Hey!

Your answer is element A

Explanation:

Using the graph, the element A's emission of radioactive particles ends approximately after 6 years...

A HALF-LIFE IS "HALF" OF THAT TIME PERIOD!

So if the radiation goes for 6 years the half-life is 6 divided by two which gives you 3 years!

The rest however have a longer half-life...

Because they all end at 14 yrs so their half-life in 7 years!

HOPE THIS HELPS!!

8 0

3 years ago

use the formula force=mass × acceleration to find the force of a 20 kg cart rolling at an acceleration of .5 m/s

o-na [289]

Answer:

The answer is 10

Explanation:

7 0

3 years ago

A 1.00 L buffer solution is 0.112 M in acetic acid and 0.112 M in sodium acetate. Acetic acid has a pKa of 4.74. What is the pH

topjm [15]

Answer:

ΔpH = 1.25

Explanation:

Using Henderson-Hasselbalch formula:

pH = pka + log [CH₃COONa] / [CH₃COOH]

pH = 4.74 + log [0.112] / [0.112]

pH = 4.74

The reaction of sodium acetate (CH₃COONa) with HCl is:

CH₃COONa + HCl → CH₃COOH + NaCl

Producing acetic acid, CH₃COOH.

If 0.1mol of HCl reacts the final moles of CH₃COONa are:

0.112mol - 0,1 mol = 0.012mol

Moles of acetic acid are:

0.112mol + 0,1 mol = 0.212mol

Using Henderson-Hasselbalch formula:

pH = pka + log [CH₃COONa] / [CH₃COOH]

pH = 4.74 + log [0.012] / [0.212]

pH = 3.49

Change in pH, ΔpH = 4.74 - 3.49 = 1.25

I hope it helps!

6 0

3 years ago

The pH at the midpoint in the titration of an acid with a base is A) equal to the pK of the corresponding base. B) equal to the

iVinArrow [24]

Answer:

The pH at the midpoint in the titration of an acid with a base is

A) equal to the pK of the corresponding base.

B) equal to the pK of the corresponding acid.

C) equal to 14 minus the pK of the corresponding acid.

D) equal to 14 plus the pK of the corresponding base.

E) none of the above

Explanation:

When a weak acid is titrated with a strong base, then a buffer solution is formed.

pH of a buffer solution can be calculated by using the formula:

$pH=pKa+log\frac{[salt]}{[acid]}$

Exactly at the mid point,

[conjugate base of the salt]=[acid]

So, log [salt]/[acid] =0

Hence, pH of the solution will be equal to pKa of the weak acid.

Answer is option B.

6 0

3 years ago

Pls help its rlly hard

matrenka [14]

Answer:

Plastic has a low electrical conductivity, and metal has high electrical conductivity

6 0

3 years ago