Chemical Equation

Chemical Equation

Multiple Choice

The blue numbers in the image below represent ________

• element symbol

• coefficients

• subscripts

• yield

Multiple Choice

How many Nitrogen (N) atoms are in 4NH₃?

• 4

• 1

• 3

• 12

Multiple Choice

What does the number 4 represent in 4NH₃?

• Subscript

• Superscript

• Coefficient

Multiple Choice

What does the number ₃ represent in 4NH₃?

• Subscript

• Superscript

• Coefficient

Multiple Choice

How many atoms of sulfur are in each molecule of H₂SO₄?

• 1

• 4

• 2

• 7

Multiple Select

The formula shown here represents the breakdown of a metal into rust. What elements are involved in this reaction? Check all that apply. $4Fe\ +\ 3O_2\ \rightarrow\ 2Fe_2O_3$  

• Iron

• Oxygen

• Carbon

• Nitrogen

Multiple Choice

 $C_2H_6\ +\ 5O_2\ \rightarrow\ 2CO_2\ +\ 3H_2O_2$  
Given this chemical equation, what are the PRODUCTS?

•  $C_2H_{6\ }and\ 5O_2$  

•  $2CO_2\ and\ 3H_2O_2$  

Multiple Choice

 $C_2H_6\ +\ 5O_2\ \rightarrow\ 2CO_2\ +\ 3H_2O_2$  
Given this chemical equation, what are the REACTANTS?

•  $C_2H_{6\ }and\ 5O_2$  

•  $2CO_2\ and\ 3H_2O_2$  

Multiple Select

Which of the following represent chemical equations? Check all that apply.

• $2Na\ +\ H_2O\ \rightarrow\ 2NaOH\ +\ H_2$

• $2KClO_3\ \ \rightarrow\ 2KCl\ +\ 3O_2$

• $2Fe\ +\ 3O_{2\ }\rightarrow\ 2Fe_2O_3$

• $2H_2O$

• $3O_3\ ,\ H_2O$

Multiple Choice

Is the following equation balanced?
2C₂H₂ + 5O₂ --> 4CO₂ + 2H₂O

• yes
• no

Multiple Choice

Is the following equation balanced?...
Al + O₂ --> 2Al₂O₃

• Yes!
• No!

Multiple Choice

Which number should go in the blank?
_ H₂ + O₂ -> 2 H₂O

• 1
• 2
• 3
• 0

Multiple Choice

Identify the reactant(s) and product(s) of the reaction.

• All three are reactants and none are products.
• Hydrogen and water are the reactants, and oxygen is the product.
• Water and oxygen are the reactants, and hydrogen is the product.
• Hydrogen and oxygen are the reactants, and water is the product.
  

Multiple Choice

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

• 1
• 2
• 3
• 4

Multiple Choice

Which of the following shows the correct way to balance the chemical equation?
Fe + O₂ -> Fe₂O₃

• 4Fe + 3O₂ -> 2Fe₂O₃
• 2 Fe + 3O₂ -> Fe₂O₆
• 4 Fe + O₆ -> 2Fe₂O₃
• None of the options are correctly balanced.

Multiple Choice

Review the image and then pick the scenario below which best illustrates the Law of Conservation of Mass.

• A scientist adds 5g of Substance A to 5g of Substance B. A reaction occurs that produces 10g of Substance C.

• A scientist adds 5g of Substance A to 5g of Substance B. A reaction occurs that produces 15g of Substance C.

Multiple Choice

To balance a chemical equation, it may be necessary to adjust the

• formulas of the products

• subscripts

• coefficients

• number of products

Multiple Choice

At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?

• the product is doubled
• the product is half the mass of the reactants
• the mass is the same
• the mass changes depending on the reaction

Multiple Choice

Balance this equation.
_Mg + _Cl₂ --> _MgCl₂

• 1, 2,1
• already balanced
• 2,1,1
• 1,1,2