Intro: Balancing Equations

​Introduction:

Elements and Balancing Equations

Multiple Choice

WHAT'S THE FIRST STEP IN BALANCING CHEMICAL EQUATIONS?

• COUNT THE ELECTRONS ON EACH SIDE OF THE EQUATION

• SUBTRACT THE ATOMIC NUMBER FROM MASS

• TAKE INVENTORY/COUNT THE NUMBER OF ELEMENTS AND ATOMS IN THE PRODUCTS AND REACTANTS

• DRAW A VENN DIAGRAM

READ AND PRACTICE: BALANCE CHEMICAL EQUATIONS

-STUDY​

​-PRACTICE

​

​Some text here about the topic of discussion.

​FOLLOW THE STEPS

​

Multiple Choice

Is the following equation balanced?

Al + O₂ ---> 2Al₂O₃

• YES

• NO

Multiple Choice

What is the number before a chemical formula called?

Example: 2H₂ + O₂ ---> 2H₂O

• Coefficient

• Atom

• Subscript

• Equation

Multiple Choice

Balance this equation:

H₂ + Cl₂ ---> HCl

• It is balanced.

• H₂ + Cl₂ ---> 2HCl

• 3H₂ + Cl₂ ---> 6HCl

• H₂ + 3Cl₂ ---> 6HCl

Multiple Choice

Complete the sentence.

During a chemical reaction, atoms ________.

• can appear

• can disappear

• get rearranged

• stop moving and vibrating

Multiple Choice

What is the Law of Conservation of Mass?

• It states that matter cannot be created or destroyed.

• It states that energy cannot be created or destroyed.

• It states that matter can be created or destroyed.

• It states that sound can be created or destroyed.

Multiple Choice

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

• 1
• 2
• 3
• 4

Multiple Choice

What is the left part of a chemical equation called?
2H_{2 +} O₂ --> 2H₂O

• Reactants
• Products 
• Yields 
• Chemical Equation 

Multiple Choice

What is the right part of a chemical equation called...
2H_{2 +} O₂ --> 2H₂O

• Reactants
• Products 
• Yields 
• Chemical Equation 

Multiple Choice

How many atoms of carbon (C) are in C₆H₁₂O₆?

• 3
• 6
• 12
• 24

Multiple Choice

How many Aluminum are in Al₂O₃?

• 3
• 2
• 5

Multiple Choice

How many Aluminum are in Al₂O₃?

• 3
• 2
• 5

Multiple Choice

How many Hydrogen are in 4H₂O?

• 6
• 8
• 2
• 4

Multiple Choice

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

• 1
• 2
• 3
• 0

Multiple Choice

Which number should go in the blank?
2 Na+ _ Cl₂ -> 2 NaCl

• 1
• 2
• 3
• 0

Multiple Choice

Name the part in red:

H₂ + O₂ -> H₂O

• Coefficient
• Product
• Yield
• Subscript

Multiple Choice

Balance this equation-
__P₄ + __O₂ --> __P₂O₃

• it is already balanced
• 2, 1, 3
• 1, 2, 3
• 1, 3, 2

Multiple Choice

Balance this equation.
_Mg + _Cl₂ --> _MgCl₂

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