Chemical formulas and balancing equations

Dropdown

How many Hydrogen atoms are in 4 H₂O? ​

Select answer

How many oxygen atoms? ​

Select answer

Drag and Drop

2 CH₂CO₃OH

Number of C: ​

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Number of H: ​

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Number of O: ​

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Drag these tiles and drop them in the correct blank above

4

6

8

2

3

1

5

7

9

10

Equations

Balanced Equation: Reactants and Products contain the same amount of atoms in the formula
and the same Elements

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Balancing Equations

​Reactants Products

Multiple Choice

Is this equation balanced?

• yes
• no
• Not enough information

Multiple Choice

Is this equation balanced?

• yes
• no
• Not enough information

Multiple Choice

Is the equation balanced?: 2H₂O + O₂ --> 4MgO + 3Fe

• Yes
• No

Law of conservation of mass

-Matter cannot be gained or lost in a chemical reaction.

Multiple Choice

What does the Law of Conservation of Mass state?

• Matter cannot be gained or lost in a chemical reaction.
• Matter can only be lost in a chemical reaction.
• Matter can only be gained in a chemical reaction.
• Matter can be gained and lost in a chemical reaction. 

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

In chemical reactions, what does the principle of conservation of mass mean?

• Matter is not created or destroyed.
• The total mass of the reactants is greater than the total mass of the products.
• The total mass of the reactants is less than the total mass of the products.
• Matter is not changed.
  

Multiple Choice

The substances at the beginning of a chemical equation are called the ____

• product
• yield
• chemical symbol
• reactants

Multiple Choice

What is the right part of a chemical equation called...

H_{2 +} O₂ --> H₂O

• Reactants

• Products

• Yields

• Chemical Equation

​GP

• Work on questions 1-5

• Work with your partner

• 7 min

​IP

• 7 min

• Work on questions 6-10 by yourself

• Voice Level 0

Multiple Choice

How many atoms of Cl are in the following compound: 2NaCl

• 0

• 1

• 2

• 3

Multiple Choice

How many atoms of F are in the following compound: MgF₂

• 0

• 1

• 2

• 3

Multiple Choice

Is the equation (2Na + MgF₂ ➔ 2NaF + Mg) balanced?

• Yes

• No