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aev [14]
3 years ago
14

Except for helium, all the elements in the last column of the periodic table have

Chemistry
1 answer:
lorasvet [3.4K]3 years ago
4 0

Answer:

O

Explanation:

they have O valence electrons

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3.
Andreyy89

Answer:

The answer to your question is the second option

Explanation:

Reaction

               Al₂(SO₄)₃  + KOH   ⇒   Al(OH)₃   +   K₂SO₄

Process

1.- Check if the reaction is already balanced

                Reactants             Elements             Products                                                                                

                      2                     Aluminum                   1

                      3                     Sulfur                          1

                     13                     Oxygen                      7

                      1                    Potassium                    2

                      1                     Hydrogen                   3

The reaction is unbalanced

2.- Balance the reaction

                 1Al₂(SO₄)₃  + 6KOH   ⇒  2Al(OH)₃   +  3K₂SO₄

               Reactants             Elements             Products                                                                                

                      2                     Aluminum                   2

                      3                     Sulfur                          3

                     18                     Oxygen                      18

                      6                    Potassium                    6

                      6                     Hydrogen                   6

Now the reaction is balanced. The coefficients are 1, 6, 2, 3.

5 0
3 years ago
Read 2 more answers
Unit 1 chemistry test
Artist 52 [7]
Ok what’s the question sir
5 0
3 years ago
The Earth only has a limited supply of fresh water; eventually, we will have to use ocean water. We will purify ocean water thro
Romashka-Z-Leto [24]
I don't learn chemistry yet but I see where you are right now... I think this will change in the near future because we will only have the ocean water to survive... So we purify the water... Because this will almost be all we have, we'll have no choice BUT to make money on this.... Sorry if it's wrong I don't learn chemistry yet
6 0
4 years ago
A liquid dietary supplement is packaged in 10-ml dropper containers to deliver 2000 international units of vitamin d3 in each dr
RoseWind [281]

Answer : 37 drops are delivered per milliliter of the solution.

Explanation :

The problem gives us lot of extra information.

We want to find the number of drops delivered in 1 milliliter here.

We have been given that, one drop of the solution delivers 0.027 mL of solution.

Let us use this as a conversion factor, \frac{1 drop}{0.027 mL}

Let us find number of drops in 1 mL using this conversion factor.

1 mL \times \frac{1 drop}{0.027mL} = 37.0 drops

Therefore we can say that 37 drops are delivered per milliliter of the solution.

7 0
4 years ago
What is a mammal and why are they called mammals​
taurus [48]

Answer:

mammals are the animal who lay eggs

7 0
3 years ago
Read 2 more answers
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