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disa [49]
3 years ago
7

6. Alkali metals, alkaline earth metals, and halogens

Chemistry
2 answers:
Illusion [34]3 years ago
7 0
<h2>Answer: c) 1, 2, and 17 </h2>

Explanation:

  • Alkali Metals are Group 1
  • Alkaline Earth Metals Group 2
  • Halogens are Group 17

melisa1 [442]3 years ago
3 0

Answer: c

Explanation:

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Express the concentration of a 0.0320 M aqueous solution of fluoride, F−, in mass percentage and in parts per million (ppm). Ass
denis23 [38]

Answer:

607 ppm

Explanation:

In this case we can start with the <u>ppm formula</u>:

ppm=\frac{mg~of~solute}{Litters~of~solution}

If we have a solution of <u>0.0320 M</u>, we can say that in 1 L we have 0.032 mol of F^-, because the molarity formula is:

M=\frac{mol}{L}

In other words:

0.0320~M=\frac{mol}{1~L}

mol=0.032~M*1~L=0.032~mol

1~L~of~Solution=0.0320~mol~of~solute

If we use the <u>atomic mass</u> of F  (19 g/mol) we can convert from mol to g:

0.0320~mol~F^-\frac{19~g~F^-}{1~mol~F^-}~=~0.607~g

Now we can <u>convert from g to mg</u> (1 g= 1000 mg), so:

0.607~g\frac{1000~mg}{1~g}=607~mg

Finally we can <u>divide by 1 L</u> to find the ppm:

ppm=\frac{607~mg}{1~L}=~607~ppm

<u>We will have a concentration of 607 ppm.</u>

I hope it helps!

4 0
4 years ago
Why is the equation: 4Fe+ 3O2 → 2Fe2O unbalanced for rust?
ahrayia [7]

Explanation:

Because two sides don't have an equal number of O atoms. The left side has 6 O atoms (3*2) while the right side has only 1 O atom. to balance the equation, you need an equal number of atoms on both sides.

5 0
2 years ago
Read 2 more answers
Red paint mixed with blue paint becomes purple. What is the most likely cause of this color change?
melamori03 [73]

Answer:

I might be late but when red paint and blue paint mix to become purple. its a <u>physical change</u>, so its C

Explanation:

5 0
3 years ago
A technical machinist is asked to build a cubical steel tank that will hold 195 L of water. Calculate in meters the smallest pos
Aleks04 [339]

Answer:

The smallest possible inside length of the tank is 0.579 m.

Explanation:

As we know that

1 m^3 = 1000 L

Thus, volume of 195 liter tank is also equal to 0.195 cubic meter

The volume of a cube is equal to x^3, where, x is the length of the side of the cube

With the give condition,

x^ 3 = 0.195

Solving the above equation, we get -

x = (0.195)^{\frac{1}{3})}\\x = 0.579

The smallest possible inside length of the tank is 0.579 m.

4 0
3 years ago
What are the forces that hold sodium and chloride ions together?
Phantasy [73]
Sodium is a metal, Chloride is a non-metal.

Right off the bat, you know that in order for both of these atoms to achieve a full valence shell that the metal has to lose electrons, and the non-metal has to gain them.

Therefore, you have the transfer of electrons in this bond in order to form ions.
Na+ and Cl-. This transfer of electrons in a bond is called an {{ Ionic Bond}}
6 0
3 years ago
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