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yulyashka [42]
3 years ago
6

Use trends in the periodic table to predict the intensity of the following reactions. Match the letter of each reaction to the p

redicted result.
A. Lithium (Li) in water
B. Sodium (Na) in water
C. Potassium (K) in water



violent gas formation
strong gas formation
extremely violent gas formation
Chemistry
1 answer:
Shtirlitz [24]3 years ago
4 0
We can use the reactivity series of metals to solve this.

The reactivity series of metals are (in descending order) :
Potassium, sodium, Lithium, calcium, Magnesium, aluminum, zinc, iron, tin, lead, copper, mercury, silver, platinum, gold.

Since Potassium is the most reactive, the reaction with water should produce extremely violent gas.

Sodium is the next most reactive, so it should produce violent gas.

And Lithium is the least reactive out of the 3 metals, so it should be strong gas formation.

In addition, the gas produced should be hydrogen, since the reaction of metals should water should produce "metal name" hydroxide + hydrogen.
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If 5.0 kJ of energy is added to a 15.5-g sample of water at 10.°C, the water is Group of answer choices
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Answer:

The water is completely vaporized at this stage.

Explanation:

The complete question is

If 5.0 kJ of energy is added to a 15.5-g sample of water at 10.°C, the water is

-boiling

-completely vaporized

-frozen solid

-decomposed

-still a liquid

Energy added = 50 kJ = 50000 J

mass of water = 15.5 g = 0.0155 kg

temperature of water = 10 °C

We know that the energy posses by a mass of water at a given temperature is given as

H = mcT

where H is the energy possessed by the mass of water

m is the mass of the water

c is the specific heat capacity of water = 4200 J/ kg- °C

T is the temperature of the water

substituting values, the energy of this amount of water is

H = 0.0155 x 4200 x 10 = 651 J

If 50 kJ is added to the water, the energy increases to

50000 J + 651 J = 50651 J

Temperature of this water at this stage will be gotten from

H = mcT

we solve for the new temperature

50651 = 0.0155 x 4200 x T

50651 = 65.1 x T

T = 50651/65.1 = 778.05 °C

This temperature is well over 100 °C, which is the vaporization temperature of water, but less than 3000 °C for its molecules to decompose.

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