quiz 3 sec 1 lesson 3

This chemical equation is unbalanced :

〖As(OH)〗3+H2〖SO〗4→〖As〗2 ((SO)4 )3+H2O

What is the coefficient of water after balancing the equation?

• 2

• 4

• 6

• 8

Sodium carbonate salt reacts with hydrochloric acid to form sodium chloride, carbon dioxide and water respectively, what is the correct order of the coefficients of these substances in the balanced symbolic equation respectively?

• 3,6,6,3,4

• 8, 6,5, 10,5

• 5, 10, 10,5,5

• 1,2,2,1,1

What is the summation of the coefficients in this equation after balancing?

〖NaNH〗2+ 〖NaNO〗3→〖NaN〗3+NaOH+〖NH〗3

• 9

• 8

• 7

• 6

Copper (II) sulphate reacts with sodium hydroxide solution forming a blue precipitate of copper (II) hydroxide … Which of the following equation represents the net ionic equation of this reaction?

• Cu((aq))^(2+)+OH((aq))^-→〖Cu(OH)〗(2(s))

• Cu_((aq))^(2+)+2OH((aq))^-→〖Cu(OH)〗2(s)

• Cu_((aq))^(2+)+2OH_((aq))^-→〖Cu(OH)〗_((s))

• Cu_((s))^(2+)+2OH_((aq))^-→〖Cu(OH)〗_(2(s))

Drops of sodium hydroxide are added to an amount of water in a tube … Which of the following choices does not exist in the tube?

• OH

• Na⁺

• NaOH

• Na⁺, OH^ꟷ

what is the formula of aluminium oxide?

• Al₂O₃

• Al₂(OH)₃

• AlO₂

• AlO

What is the formula of strontium carbonate?

• Sr₂CO₃

• Sr(CO₃)₂

• SrHCO₃

• SrCO₃

Which of the following is equivalent to the chemical formula “3CO₂”?

• 3 free carbon atoms and 6 free oxygen atoms

• 1 molecule of triple carbon dioxide

• 3 molecules of carbon dioxide

• 3 dioxycarbon molecules

What would the name of a compound of calcium and fluorine be?

• Fluorine calcide

• Calcium fluoride

• Calcide fluorine

• Fluoride calcium

An experiment shows that hydrogen peroxide decomposes to form water and oxygen gas. Which of the following word equations describes the chemical reaction that has occurred in this experiment?

• (a) Hydrogen peroxide → hydrogen + oxygen peroxide

• Hydrogen peroxide + water -> oxygen

• Hydrogen peroxide -> water + oxygen

• Hydrogen peroxide -> peroxide + hydrogen