Question

Write systematic names of the following compounds with correct spelling. Fe_2O_3___SO_3___Na_2SO_3___N_2O_4___Write chemical formula of the following compounds: Magnesium Chloride___potassium phosphate___Ammonium nitrate___Copper(I) 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? A 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. Express this diameter in centimeters. 1.27 times 10^5 cm 1.27 times 10^6 cm 1.27 times 10^7 cm 1.27 times 10^8 cm 1.27 times 10^9 cm

Answer 1

Fe₂O₃ - Iron (III) oxide OR Ferric Oxide

SO₃ - Sulfur trioxide

Na₂SO₃ - Sodium sulfite

N₂O₄ - Dinitrogen tetroxide

Magnesium Chloride - MgCl₂

Potassium Phosphate - KH₂PO₄

Ammonium Nitrate - NH₄NO₃

Copper (I) oxide - Cu₂O

1) Chemical equations are balanced in order to obey the law of mass conservation.

2) Water, when heated to 100^oC forms steam.

3) Burning a piece of coal.

4) 12.7 Million meter (12.7 x 10⁶) = 1.27 x 10⁹ cm