Atoms in Chemical Reactions: Lesson

Atoms in Chemical Reactions: Tutorial

by David Blankenship

Multiple Choice

Select the correct answer.

Which formula shows a sandwich with two slices of rye bread (R) and one slice of turkey (T)?

• RT

• R₂T

• R₂T₂

• RT₂

Multiple Choice

Select the correct answer.

During the lunch rush, Ryan made ten sandwiches with two slices of rye bread and one slice of turkey. Which formula represents the sandwiches he made?

• 12RT

• 10R₂T

• 12RT₂

• 10RT₂

Multiple Choice

Select the correct answer.

Nitrous oxide is the chemical name for “laughing gas.” What are the names and the number of atoms in a molecule of nitrous oxide, N₂O?

• one nitrogen atom and two oxygen atoms

• two nitrogen atoms and one oxygen atom

• one nitrogen atom and one oxygen atom

• two nitrogen atoms and two oxygen atoms

Multiple Choice

Select the correct answer.

Carbon tetrachloride is a toxic liquid. A carbon tetrachloride molecule has one atom of carbon and four atoms of chlorine. What is its chemical formula?

• CCl

• 4CCl

• C₄Cl

• CCl₄

Multiple Choice

Select the correct answer.

Potassium chloride is a white solid used in medicine. There is one atom of potassium for each atom of chlorine. What is its chemical formula?

• KCl

• Pt₂Cl

• K₂Cl

• KCl₂

Multiple Choice

What coefficient should be used to make the following equation balanced?
N₂+O₂--> _NO 

• 1
• 2
• 3
• 4

Multiple Choice

Which equation is balanced?

• PbO₂ + 2H₂

• SO₂ + H₂0 --> H₂SO₄

• 2Na + 2H₂O --> 2NaOH + H₂

Multiple Choice

How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl₂ + H₂

• 1
• 2
• 3
• 4

Multiple Choice

What law governs the balancing of chemical equations?

• Law of Energy

• Law of Conservation of Matter/Mass

• Law of Gravity

• Law of Matter Movement

Multiple Choice

What is the total number of atoms present in 5Na₃PO₄

• 5
• 40
• 55
• 8

Multiple Choice

Balance this equation

_Al +_HCl --> _H₂ +_AlCl₃

• 2,6,3,2

• it's already balanced

• 4,12,3,4

• 2,1,4,5

Multiple Choice

What are the coefficients that would properly balance this equation?

__Ca + __H₂O --> __Ca(OH)₂ + __H₂

• 2,1 --> 2,1

• 1,2 --> 1,1

• 1,2 --> 2,4

• 1,2 --> 2,1

Multiple Choice

What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__CO + __Fe₂O₃--> __Fe + __CO₂

• 3,1 --> 2,3
• 3,2 --> 1,1
• 3,2 --> 2,4
• 3,2 --> 2,1

Multiple Choice

What are the coefficients that would properly balance this equation?

__AgNO₃ + __H₂S --> __Ag₂S+ __HNO₃

• 2,1 --> 1,2

• 1,2 --> 1,1

• 1,2 --> 1,2

• 1,2 --> 2,1

Multiple Choice

What are the coefficients that would properly balance this equation?

__H₂ + __S --> __H₂S

• 1,1 --> 1

• 2,2 --> 2

• 1,2 --> 1

• 1,2 --> 2

Multiple Choice

What are the coefficients that would properly balance this equation?

__Al + __O₂--> __Al₂O₃

• 4,1 --> 2

• 4,3 --> 4

• 3,4 --> 1

• 4,3 --> 2

Multiple Choice

What is the total number of atoms present in 5Na₃PO₄

• 5
• 40
• 55
• 8

Multiple Choice

Determine the coefficients to make the following equation balanced?

__N₂ + __O₂--> __NO

• 1, 1, 1

• 1, 1, 2

• 2, 2, 2

• 1, 2, 2

Multiple Choice

Determine the coefficients to balance the equation.

__Al +__HCl --> __H₂ +__AlCl₃

• 2,6,3,2

• it's already balanced

• 4,12,3,4

• 2,1,4,5

Multiple Choice

Balance the the following equation.

__Zn+__HCl -->__ZnCl₂ +__H₂

• 1,1,2,1

• 1,1,1,2

• 1,2,1,1

• 2,1,1,1

Multiple Choice

Which number should go in the blank?
Mn + _ HNO₃ → Mn(NO₃)₂ + H₂

• 1
• 2
• 3
• 0

Multiple Choice

Which number should go in the blank?
Al(NO₃)₃ + _  NaOH -> Al(OH)₃ + 3 NaNO₃

• 1
• 2
• 3
• 0

Multiple Choice

The numbers needed to balance the equation are:

• 1, 1, 1, 2
• 1, 1, 2, 2
• 1, 1, 1, 1
• 2, 3, 1, 3

Multiple Choice

The numbers needed to balance the equation are:

• 2, 7, 6, 4
• 2, 1, 3, 2
• 1, 1, 3, 2
• 2, 3, 1, 3

Multiple Choice

The numbers needed to balance the equation are:

• 2, 7, 6, 4
• 2, 1, 3, 2
• 3, 1, 1, 3
• 2, 3, 1, 3