Ethanol (CH 3 CH 2 OH) burns in oxygen (O 2 ) to form carbon dioxide (CO 2 ) and water (H 2 O). Which one shows the balanced symbol equation for this reaction?

CH 3 CH 2 OH + 3O 2 -> 2CO 2 + 3H 2 O

CH 3 CH 2 OH + O 2 -> CO 2 + H 2 O

CH 3 CH 2 OH + 2O 2 -> 2CO 2 + 3H 2 O

CH 3 CH 2 OH + 5-> 2CO 2 + 6H 2 O

Practice Quiz: Balancing Equations & Calculations

Authored by Judah Tolosa

Chemistry

8th Grade

Used 15+ times

Practice Quiz: Balancing Equations & Calculations

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MULTIPLE CHOICE QUESTION

1 min • 1 pt

Sodium (Na) burns in oxygen (O₂) to form sodium oxide (Na₂O).
What is the balanced symbol equation for this reaction?

4Na + 2O -> 2Na₂O

4Na + O₂-> 2Na₂O

2Na₂ + O₂-> 2Na₂O

2Na₂ + 2O -> 2Na₂O

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Solid sodium metal (Na) reacts with water (H₂O) to form an aqueous solution of sodium hydroxide (NaOH) and hydrogen gas (H₂).
Which symbol equation is correct?

2Na_(s) + 2H₂O_(l)-> 2NaOH_(l) + H_2(g)

2Na_(s) + 2H₂O_(g)-> 2NaOH_(aq) + H_2(g)

2Na_(s) + 2H₂O_(l)-> 2NaOH_(aq) + H_2(g)

2Na_(s) + 2H₂O_(aq)-> 2NaOH_(aq) + H_2(g)

FILL IN THE BLANKS QUESTION

30 sec • 1 pt

Germanium, Ge is extracted from Germanium(IV) oxide by heating with hydrogen.
Balance the symbol equation below for the reaction by writing the missing coefficient.
GeO₂ + _H₂ -> Ge + 2H₂O

(a)

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Ethanol (CH₃CH₂OH) burns in oxygen (O₂) to form carbon dioxide (CO₂) and water (H₂O).
Which one shows the balanced symbol equation for this reaction?

CH₃CH₂OH + O₂ -> CO₂ + H₂O

CH₃CH₂OH + 2O₂ -> 2CO₂ + 3H₂O

CH₃CH₂OH + 3O₂ -> 2CO₂ + 3H₂O

CH₃CH₂OH + 5-> 2CO₂ + 6H₂O

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Which of the following shows a balanced symbol equation for the reaction of nitrogen (N₂) and hydrogen (H₂) forming ammonia (NH₃)?

N₂ + H₂ -> NH₃

2N₂ + 3H₂ -> 2NH₃

N₂ + 2H₂ -> 2NH₃

N₂ + 3H₂ -> 2NH₃

FILL IN THE BLANKS QUESTION

2 mins • 1 pt

What is the relative formula mass (M_r) of Mg(OH)₂?

(a)

FILL IN THE BLANKS QUESTION

2 mins • 1 pt

Calculate the relative formula mass (M_r) of ammonium phosphate, (NH₄)₃PO₄.
(A_r: N =14, H = 1, P = 31, O = 16)

(a)

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Practice Quiz: Balancing Equations & Calculations

Sodium (Na) burns in oxygen (O₂) to form sodium oxide (Na₂O).
What is the balanced symbol equation for this reaction?

Solid sodium metal (Na) reacts with water (H₂O) to form an aqueous solution of sodium hydroxide (NaOH) and hydrogen gas (H₂).
Which symbol equation is correct?

Germanium, Ge is extracted from Germanium(IV) oxide by heating with hydrogen.
Balance the symbol equation below for the reaction by writing the missing coefficient.
GeO₂ + _H₂ -> Ge + 2H₂O

(a)

Ethanol (CH₃CH₂OH) burns in oxygen (O₂) to form carbon dioxide (CO₂) and water (H₂O).
Which one shows the balanced symbol equation for this reaction?

Which of the following shows a balanced symbol equation for the reaction of nitrogen (N₂) and hydrogen (H₂) forming ammonia (NH₃)?

What is the relative formula mass (M_r) of Mg(OH)₂?

(a)

Calculate the relative formula mass (M_r) of ammonium phosphate, (NH₄)₃PO₄.
(A_r: N =14, H = 1, P = 31, O = 16)

(a)

Calculate the percentage composition by mass of nitrogen in ammonium phosphate, (NH₄)₃PO₄.
(A_r: N =14, H = 1, P = 31, O = 16)
Round off your answer to two significant figures.
(Example 1: 14.6 is rounded off to 15)
(Example 2: 12.1 is rounded off to 12)

(a)

Calculate the percentage composition by mass of Aluminium, (Al) in Aluminium oxide, Al₂O₃?
(A_r: Al = 27, O = 16).
Round off your answer to two significant figures.

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Practice Quiz: Balancing Equations & Calculations

Sodium (Na) burns in oxygen (O2) to form sodium oxide (Na2O). What is the balanced symbol equation for this reaction?

Solid sodium metal (Na) reacts with water (H2O) to form an aqueous solution of sodium hydroxide (NaOH) and hydrogen gas (H2). Which symbol equation is correct?

Germanium, Ge is extracted from Germanium(IV) oxide by heating with hydrogen. Balance the symbol equation below for the reaction by writing the missing coefficient.GeO2 + _H2 -> Ge + 2H2O (a)

Ethanol (CH3CH2OH) burns in oxygen (O2) to form carbon dioxide (CO2) and water (H2O). Which one shows the balanced symbol equation for this reaction?

Which of the following shows a balanced symbol equation for the reaction of nitrogen (N2) and hydrogen (H2) forming ammonia (NH3)?

What is the relative formula mass (Mr) of Mg(OH)2? (a)

Calculate the relative formula mass (Mr) of ammonium phosphate, (NH4)3PO4.(Ar: N =14, H = 1, P = 31, O = 16) (a)

Calculate the percentage composition by mass of nitrogen in ammonium phosphate, (NH4)3PO4. (Ar: N =14, H = 1, P = 31, O = 16)Round off your answer to two significant figures. (Example 1: 14.6 is rounded off to 15) (Example 2: 12.1 is rounded off to 12) (a)

Calculate the percentage composition by mass of Aluminium, (Al) in Aluminium oxide, Al2O3?(Ar: Al = 27, O = 16). Round off your answer to two significant figures.

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Sodium (Na) burns in oxygen (O₂) to form sodium oxide (Na₂O).
What is the balanced symbol equation for this reaction?

Solid sodium metal (Na) reacts with water (H₂O) to form an aqueous solution of sodium hydroxide (NaOH) and hydrogen gas (H₂).
Which symbol equation is correct?

Germanium, Ge is extracted from Germanium(IV) oxide by heating with hydrogen.
Balance the symbol equation below for the reaction by writing the missing coefficient.
GeO₂ + _H₂ -> Ge + 2H₂O

(a)

Ethanol (CH₃CH₂OH) burns in oxygen (O₂) to form carbon dioxide (CO₂) and water (H₂O).
Which one shows the balanced symbol equation for this reaction?

Which of the following shows a balanced symbol equation for the reaction of nitrogen (N₂) and hydrogen (H₂) forming ammonia (NH₃)?

What is the relative formula mass (M_r) of Mg(OH)₂?

(a)

Calculate the relative formula mass (M_r) of ammonium phosphate, (NH₄)₃PO₄.
(A_r: N =14, H = 1, P = 31, O = 16)

(a)

Calculate the percentage composition by mass of nitrogen in ammonium phosphate, (NH₄)₃PO₄.
(A_r: N =14, H = 1, P = 31, O = 16)
Round off your answer to two significant figures.
(Example 1: 14.6 is rounded off to 15)
(Example 2: 12.1 is rounded off to 12)

(a)

Calculate the percentage composition by mass of Aluminium, (Al) in Aluminium oxide, Al₂O₃?
(A_r: Al = 27, O = 16).
Round off your answer to two significant figures.