Balancing Chemical Equations

The substances at the beginning of a chemical equation are called the ____.
A + B --> AB

• product
• yield
• chemical symbol
• reactants

In a chemical reaction, everything to the right of the arrow is called _____.
A + B --> AB

• Products
• Yields
• Molecules
• Reactants

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. 

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

The red numbers in the image represent _____.

• subscripts
• coefficients
• charges
• oxidation states

The blue numbers in the image represent ________.

• charges
• coefficients
• subscripts
• oxidation states

What does the arrow in a chemical equation stand for?
H_{2 +} O --> H₂O

• Reactants
• Products 
• Yields 
• Chemical Equation 

Balance this equation
_Al +_HCl --> _H₂ +_AlCl₃

• 2, 6, 3, 2
• it is already balanced
• 4, 12, 3, 4
• 2, 1, 4, 5

Balance this equation.
_CH₄ + _O₂ --> _CO₂ + _H₂O

• 1,2,1,1
• 2,1,2,1
• 1,2,1,2
• 0,2,0,2

What type of reaction is this?
3Ca + 2AlCl₃ --> 3CaCl₂ + 2Al

• Synthesis
• Decomposition
• Single displacement
• Double displacement

What type of reaction is this?
3KOH + H₃PO₄ --> K₃PO₄ + 3H₂O

• Synthesis 
• Decomposition
• Single displacement
• Double displacement

Tags

NGSS.MS-PS1-2