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kakasveta [241]
3 years ago
15

How many dots are shown in the electron dot diagram for calcium, element number 20?

Chemistry
1 answer:
kykrilka [37]3 years ago
4 0
2 dots  are shown for drawing it. because it has two valence electrons
           
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Determine how many ml of water you need to remove, by evaporation, if you have a 500 ml of 10.20 M HNO3 dilute solution and you
Ludmilka [50]

The total volume of water that would be removed will be 75 mL

<h3>Dilution equation</h3>

Using the dilution equation:

M1V1 = M2V2

In this case, M1 = 500 mL, V1 = 10.20 M, M2 = 12 M

Substitute:

V2 = 500 x 10.20/12

         = 425 mL

The final volume in order to arrive at 12 M HNO3 would be 425 mL from the initial 500 mL. Thus, the total amount of water that will be removed by evaporation can be calculated as:

500 - 425 = 75 mL

More on dilution can be found here: brainly.com/question/7208939

7 0
3 years ago
how can you find the common denominator and least commom denominator?? Help and thx i accedentaly clicked on the wrong subject
Marianna [84]

Common denominator - Find the Least Common Multiple of the denominators (which is called the Least Common Denominator).

Change each fraction (using equivalent fractions) to make their denominators the same as the least common denominator.

Then add (or subtract) the fractions, as we wish!

Least common denominator - You do the same thing for the common denominator

7 0
3 years ago
What volume of 0.100 M HCl will react completely with 50.00 mL of 0.200 M NaOH?
skelet666 [1.2K]
Equation of reaction
Hcl+NaoH-->Nacl+H2O
1:1
Using the formula CaVa/CbVb=na/nb
Ca(Concentation of acid)= 0.100M
Cb(Concentration of base)=0.200M
Va=?
VB=50.00ml
na=1
nb=1
from the formula
Va= CbVbna/Canb
Va= 0.2*50*1/0.1*1
=10/0.1=100ml
Therefore volume of acid = 100ml
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4 years ago
How many moles of carbon dioxide are produced when 19.3 mol of propane gas is burned in excess oxygen?
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A.57.9mol of co2 is the answer.
5 0
3 years ago
The energy required to remove an electron from an atom is known as
Alexxx [7]
It's known as "<span>ionization energy</span><span>", I believe. </span>
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