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4 years ago

If the acid A has a pKa of 5 compared acid B with Pka of 9,how much stronger is acid A over B

1 answer:

6 0

Since pKa = -log10(Ka), for every pKa value of 1 an acid is below another, the acid is 10 times stronger. Therefore acid A is 10^4 = 10000 times stronger than B.

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What is the density of platinum

Alex Ar [27]

Answer:

21.45 g/cm3

Explanation:

6 0

3 years ago

Read 2 more answers

PLEAAAASE HELP CHEM

alukav5142 [94]

Answer:

5. +5

6. +7

Explanation:

The oxidation state can be obtained as follow:

5. Oxidation state of oxygen, O = –2

Oxidation state of phosphorus, P =?

P3O10 = –5

3P + 10O = –5

3P + (10 x –2) = –5

3P – 20 = –5

Collect like terms

3P = –5 + 20

3P = 15

Divide both side by 3

P = 15/3

P = +5

Therefore, the oxidation state of P in P3O10^5- is +5

6. Oxidation state of oxygen, O = –2

Oxidation state of manganese, Mn =.?

Mn2O7 = 0

2Mn + 7O = 0

2Mn + (7 x –2) = 0

2Mn – 14 = 0

Collect like terms

2Mn = 14

Divide both side by 2

Mn = 14/2

Mn = +7

Therefore, the oxidation state of Mn in Mn2O7 is +7

4 0

3 years ago

Dolomite is a carbonate of magnesium and calcium. Analysis shows that 7.81 g of dolomite contains 1.70 grams of Ca. Fluorite is

andrew11 [14]

Answer:

The richer source of calcium is fluorite.

Explanation:

Percentage of element in compound :

$=\frac{\text{mass of element}}{\text{Mass of compound}}\times 100$

1. Dolomite is a carbonate of magnesium and calcium:

Given mass of dolomite = 7.81 g

Mass of calcium present in given mass of dolomite = 1.70 g

Percentage of calcium in Dolomite:

$=\frac{1.70 g}{7.81 g}\times 100=21.77\%$

2. Fluorite is a mineral of calcium and fluorine:

Given mass of fluorite = 2.76 g

Mass of fluorine present in given mass of fluorite = 1.34 g

Percentage of fluorine in fluorite :

$=\frac{1.34 g}{2.76 g}\times 100=48.55\%$

Percentage of calcium in fluorite = 100% - 48.55 % = 51.45%

Percentage of calcium in fluorite > Percentage of calcium in Dolomite

51.455 > 21.77%

So, the richer source of calcium is fluorite.

7 0

3 years ago

Can you tell me the answers, top from bottom please?

sineoko [7]

I downloaded the picture and labelled it and attached it here. Also the answers I have from top to bottom are:
- Beaker
- Mixture (Suspension; filtration is only usually an effective method of
separation if the mixture is a liquid-solid suspension)
-Filter Funnel
-Filter Paper
-Residue
-Conical Flask
-Filtrate

If you need annotations let me know

3 0

3 years ago

What are the negative aspects of using nuclear energy? Select all that apply.

Semmy [17]

The answer is D hopefully it is correct

3 0

3 years ago