Question

v What happens when:
a. Magnesium burns in oxygen
b. Calcium carbonate is heated
C. Hydrogen reacts with nitrogen at necessary conditions
d. Potassium hydroxide reacts with nitric acid
e.
Carbon dioxide is treated with limewater
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Answer 1

Answer:

number 3 is correct or not

Answer 2

Explanation:

a.When the magnesium metal burns it reacts with oxygen found in the air to form Magnesium Oxide.

b.Calcium carbonate is heated strongly until it undergoes thermal decomposition to form calcium oxide and carbon dioxide. The calcium oxide (unslaked lime) is dissolved in water to form calcium hydroxide (limewater).

c.In the Haber process, nitrogen and hydrogen react together under these conditions: a high temperature - about 450°C. a high pressure - about 200 atmospheres (200 times Carbon normal pressure)

d.Dilute nitric acid reacts with potassium hydroxide solution. The equation for the reaction is: HNO3 + KOH KNO3 + H2O

e.Carbon dioxide reacts with limewater (a solution of calcium hydroxide, Ca(OH) 2), to form a white precipitate (appears milky) of calcium carbonate, CaCO 3. Adding more carbon dioxide results in the precipitate dissolving to form a colourless solution of calcium hydrogencarbonate.

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