Writing,Balancing and Classifying Chemical Equations

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

• Yes
• No

Tags

NGSS.MS-PS1-5

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

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

Tags

NGSS.MS-PS1-5

Si + S₈ --> Si₂S₄

• Synthesis (combination)
• Decomposition
• Single replacement
• Double replacement

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Ca + AlCl3 --> CaCl_{2 +} Al

• Synthesis (combination)
• Decomposition
• Single replacement
• Double replacement

C₃H₈ + O₂ --> H₂O + CO₂

• Synthesis (combination)
• Decomposition
• Single replacement
• Combustion

Mg + N₂ --> Mg₃N₂

• Synthesis (combination)
• Decomposition
• Single replacement
• Combustion

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What will weigh more when a chemical change is complete?  The reactants before the chemical reaction, or the product after the reaction is complete?

• They both will weigh the same
• The product always weighs more than the reactant
• The reactant will weigh more than the product
• They both will loose mass after the reaction

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The coefficient in  3H₂O is

• 6
• 2
• 3
• 5

Tags

NGSS.HS-PS1-7

If reaction starts with 20g of reactants it should produce 

• a total of 40g of products
• a total of 10g of products
• a total of 80 g of products
• a total of 20g of products

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A chemical reaction is balanced when

• both sides have the same elements
• Both sides have the same  number of atoms
• Same subscripts
• Same coefficients

Tags

NGSS.MS-PS1-5