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kiruha [24]
3 years ago
10

- Which scientist is given the credit for making the element?

Chemistry
2 answers:
loris [4]3 years ago
4 0
Dmitri Ivanovich Mendeleev
BlackZzzverrR [31]3 years ago
3 0

Answer:

British chemist John Newlands

Explanation:

was the first to arrange the elements into a periodic table with increasing order of atomic masses

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When the following equation is balanced, the coefficient of Al is ___ Al (s) + H20 (1) - Al(OH)3 (s) + H2 (g) A) 4 B) 1 C) 5 D)
Salsk061 [2.6K]

<u>Answer:</u> The correct answer is Option E.

<u>Explanation:</u>

Every balanced chemical equation follows law of conservation of mass.

This law states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form.  

This also means that total mass on the reactant side must be equal to the total mass on the product side.

The balanced chemical equation for the reaction of aluminium and water follows:

2Al(s)+6H_2O(l)\rightarrow 2Al(OH)_3(s)+3H_2(g)

The coefficient of Aluminium is 2.

Hence, the correct answer is Option E.

7 0
3 years ago
The Kp for the reaction below is 1.49 × 108 at 100.0°C:
kicyunya [14]
The rate constants, K, can be expressed in many different terms. In this case, Kp is the equilibrium constant expressed in terms of gas partial pressure. The formula for this is:
Kp = [P(product C) × P(product D)] / [P(reactant A) × P(reactant B)]
As there is only one product, we will use only its pressure in the numerator. 
Kp = [P(COCl2)] / [P(CO) × P(Cl2)]
P(COCl2) = 1.49 × 10⁸ × 2.22 × 10⁻⁴ × 2.22 × 10⁻⁴
P(COCl2) = 7.34 atm
6 0
3 years ago
why was the mass lost when the reaction was done in the normal setup but stayed the same when it was done in the gas collection
german
<h2>Answer : Law of conservation of mass</h2><h3>Explanation :</h3>

The law of conservation of mass states that in any reaction mass is neither created nor lost it has to remain constant in a system.

In this case, when the reaction setup was done in normal way the mass was  lost in surrounding was not considered nor being calculated; whereas when the reaction was studied in a closed system where the gas was collected after the reaction the mass changes was noted down which helped to prove the point of law of conservation of mass and energy.

One can consider an example of soda can where the carbonated drink contains pressurized carbon dioxide gas. when opened the gas bubbles gets lost into the surroundings and we don't measure the mass changes. Instead if the soda can was opened in such a way where the gas evolved was measured then the mass changed would remain the same.

6 0
4 years ago
If the boiling points of two compounds differ by 60oC at atmospheric pressure, what will be the effect on the relationship by de
boyakko [2]

Answer:

It will lead to a decrease in the boiling points

Explanation:

Decreasing the pressure exerted on a compound reduces d boiling points because a high temperature is needed also to boil a compound

6 0
3 years ago
Which planet is the largest?
Alexeev081 [22]

Answer:

1. Jupiter

2. Mercury

3. Venus

4. Venus

5. Jupiter

6. Neptune

7. Mercury

8. Saturn (used to be Jupiter)

4 0
3 years ago
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