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lilavasa [31]
3 years ago
13

Which of the following metals will react with water to produce a metal hydroxide and hydrogen gas? (2 points)

Chemistry
2 answers:
vazorg [7]3 years ago
8 0
The answer would be the first option - k
serg [7]3 years ago
8 0

<u>Answer:</u> The correct answer is Potassium (K).

<u>Explanation:</u>

Alkali (Group 1) and Alkaline earth (Group 2) elements react with water to produce metal hydroxide and also releases hydrogen gas.

Reaction of group 1 elements with water:

2M+2H_2O\rightarrow 2MOH+H_2

Reaction of group 2 elements with water:

M+2H_2O\rightarrow M(OH)_2+H_2

From the given options:

Potassium (K): This metal belongs to Group 1 and readily reacts with water to form potassium hydroxide and hydrogen gas.

2K+2H_2O\rightarrow 2KOH+H_2

Tin (Sn): This element belongs to Group 14 and does not readily reacts with water.

Nickel (Ni): This element belongs to Group 10 and does not readily reacts with water.

Manganese (Mn): This element belongs to Group 7 and does not readily reacts with water.

Hence, the correct answer is potassium (K).

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sample of atmospheric gas collected at an industrial site is stored in a 250 mL amber glass bottle that has a pressure of 1.02 a
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Answer:- New pressure is 0.942 atm.

Solution:- The volume of the glass bottle would remain constant here and the pressure will change with the temperature.

Pressure is directly proportional to the kelvin temperature. The equation used here is:

P_1T_2=P_2T_1

Where, T_1 and T_2 are initial and final temperatures, P_1 and P_2 are initial and final pressures.

T_1 = 20.3 + 273.15 = 293.45 K

T_2 = -2.0 + 273.15 = 271.15 K

P_1 = 1.02 atm

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Let's plug in the values in the equation and solve it for final pressure.

1.02atm(271.15K)=P_2(293.45K)

P_2=\frac{1.02atm*271.15K}{293.45K}

P_2 = 0.942 atm

So, the new pressure of the jar is 0.942 atm.


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