Honors Chemistry Chemical Reactions

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.HS-PS1-7

In a reaction A + B ----> C,  reactant A has 5g and product  C has 9g. How many grams does reactant B should have? 

• 4g
• 5g
• 9g
• 14g

Tags

NGSS.HS-PS1-7

Why does this picture demonstrate the Law of Conservation of Mass?

• the number of atoms of each element are the same on both sides

• they start out separate and end up combined

• the same elements are used

• it doesn't demonstrate the Law of Conservation of Mass

Tags

NGSS.HS-PS1-7

CxHy +O₂ --> H₂O + CO₂

• Decomposition
• Double replacement
• Combustion
• Single Replacement

The following reaction is an example of what reaction type? 
CoCO₃ → CoO + CO₂

• Synthesis
• Decomposition
• Single Replacement
• Double Replacement

PCl₅ + ___ H₂O → ___ HCl + H₃PO₄

• 4, 5

• 1, 6

• 3, 8

• 2,2

Which problem is balanced?

• PbO₂ + 2H₂
• SO₂ + H₂0 --> H₂SO₄
• 2Na + 2H₂O --> 2NaOH + H₂

Tags

NGSS.HS-PS1-7

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

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

Predict the products for the following reactants.
Na + MgCl₂ -->

• NaCl + Mg
• NaCl₂ + Mg
• No Reaction
• NaMgCl₂

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Predict the product of this synthesis reaction:

Al + S₈ →

• AlS

• AlS₈

• Al₂S

• Al₂S₃

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2