Question

class 7 question science it's a challenge​

Answer 1

Answer:

a) Magnesium Oxide,

b) iron + water + oxygen → hydrated iron

c) When baking soda is mixed with vinegar, something new is formed. The mixture quickly foams up with carbon dioxide gas. If enough vinegar is used, all of the baking soda can be made to react and disappear into the vinegar solution.

d) calcium carbonate

e) Iron displaces copper ions from an aqueous solution of copper sulphate. It is a single displacement reaction of one metal by another metal. Iron is placed above copper in the activity series.

Answer 2

A) Mg + O² = MgO² (or Magnesium oxide)

B) Fe + O² + H²O = Fe²O³.H²O (Rust)

C) CH³COOH + NahCO³ = C²H³NaO² (Sodium acetate)

D) Co² + Ca(OH)² = CaCO³ (Calcium carbonate)

E) CuSO⁴ + Fe = FeSO⁴ + Cu (Iron sulphate + Copper)