Write chemical formula of the following compounds with correct spellings: Al_2O_

Question

Write chemical formula of the following compounds with correct spellings: Al_2O_3 SO_3 Na_2SO_3 N_2O_4 Write chemical formula of the following compounds: Magnesium Chloride potassium phosphate Ammonium nitrate Iron(lll) oxide Circle one correct answer for each of the following questions. Chemical equations are balanced in order to obey the law of definite proportions. mass action. mass conservation. multiple proportions. Which one of the following represents a physical change? water, when heated to 100 degree C, forms steam bleach turns hair yellow sugar, when heated, becomes brown milk turns sour apples, when exposed to air, turn brown Which one of the following represents a chemical change? boiling water to form steam burning a piece of coal heating lead until it melts mixing iron filings and sand at room temperature breaking glass The diameter of Earth is 12.7 Mm (mega meter). Express this diameter in centimeters. 1.27 times 10^5 cm 1.27 times 10^6cm 1.27 times 10^7cm 1.27 times 10^8 cm 1.27 times 10^9 cm

Explanation / Answer

VIII) Al2O3 ----- Aluminium oxide

SO3 ----- Sulphur trioxide

Na2SO3 ------ Sodium sulphite

N2O4 ---- dinitrogen tetraoxide

IX) Magnesium chloride ---- MgCl2

Potasium phosphate --- KH2PO4

Ammonium nitrate ----- NH4NO3

Iron(III) Oxide ---- Fe2O3

(1) C

(2) A

(3) B

(4) Given diameter , d = 12.7 Mm = 12.7 Mm x 108 cm/Mm = 1.27x109 cm

Option (E) was correct

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