Chemistry Semester 2 Review 24-25

Which of the following is true?

• Changing the subscripts to balance an equation is acceptable

• The products are listed on the left and the reactants are listed on the right

• Atoms are conserved when balancing a chemical equation

• Coefficients can be fractions

• Subscripts can be fractions

Tags

NGSS.HS-PS1-7

When compounds containing carbon and hydrogen react with oxygen in combustion reactions what is/are produced?

• CH4(g) and O2(g)

• H2(g) and O2(g)

• CO2(g) and H2O(g)

• C2H6(g)

• None of the above

What type of reaction occurs between Ba(NO₃)₂ and K₂CrO₄?

• Synthesis

• Decomposition

• Single Replacement

• Double Replacement

• Two of the above

What type of reaction is the following?

HgO (s) → Hg(l) + O₂(g)

• Synthesis

• Decomposition

• Single Replacement

• Double Replacement

• Two of the above

What is the coefficient for aluminum after the following equation is balanced?

Al + O₂ → Al₂O₃

• 1

• 2

• 3

• 4

• 6

Tags

NGSS.HS-PS1-7

What is the coefficient for calcium after the following equation is balanced?

Lithium + Calcium Nitrate → Lithium Nitrate + Calcium

• 1

• 2

• 3

• 4

• 6

Which of the following models best demonstrates a balanced chemical equation?

• F
• G
• H
• J

Tags

NGSS.HS-PS1-7

In a chemical equation, is it true that -

• the reactant side and product side can have different numbers of atoms for each element
• there can be different elements on the reactant side and the product side
• an element or compound must be accompanied by a phase change
• the coefficients indicate the number of molecules of each reactant used and the number of molecules of each product made

Tags

NGSS.HS-PS1-7

The Law of Conservation of Mass states

• that matter exists in all states and reacts the same

• that matter can only be changed into new substances by introducing a catalyst

• that matter exists in the same state throughout any chemical change

• that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants

Tags

NGSS.HS-PS1-7

How many F atoms are in this compound?

6MgF₂

• 2

• 6

• 8

• 12

Tags

NGSS.MS-PS1-1