23-24 Chemistry Final Exam Review

N₂ +  3H₂ → 2NH₃ 
How many moles of hydrogen are needed to react with 2 moles of nitrogen?

• 6

• 3

• 2

• 1

For the Balanced Reaction: 3 Mg + 1 Fe₂O₃ → 3 MgO + 2 Fe; What is the mole ratio of MgO to Fe?

• 3 mol Mg / 2 mol Fe

• 2 mol Mg / 3 mol Fe

• 1 mol Fe / 2 mole Fe

• 3 mol MgO / 2 mol Fe

Tags

NGSS.HS-PS1-7

Cl₂ + 2KBr → Br₂ + 2KCl
How many grams of potassium chloride (KCl) can be produced from 356 g of potassium bromide (KBr)?

• 749 g

• 223 g

• 479 g

• 814 g

Tags

NGSS.HS-PS1-7

Using the following equation:
Fe₂O₃(s) + 3H₂(g) → 2Fe(s) + 3H₂O(l)
How many moles of iron can be made from  6 moles H₂? 

• 4 moles Fe

• 6 moles Fe

• 9 moles Fe

• 2 moles Fe

What is the molar mass of Fe₃(PO₄)₂?

• 823.8 g/mol

• 357.5 g/mol

• 455.6 g/mol

• 86.3 g/mol

The number of atoms you begin with in a chemical reaction ...

• must be the same as the number of  atoms you end with

• must be an even number

• can be different to the number you finish with

• changes depending on how much energy is formed

Tags

NGSS.HS-PS1-7

Balance the following:

____ Fe + ____ Cl₂ → ____ FeCl₃

• 1, 1, 2

• 1, 3, 1

• 2, 2, 3

• 2, 3, 2

Which type of reaction is:

2 NaBr + Ca(OH)₂ → CaBr₂ + 2 NaOH

• Synthesis

• Single Replacement

• Double Replacement

• Combustion

Which type of reaction is: C₂H₄ + 3 O₂ → 2 CO₂ + 2 H₂O

• Synthesis

• Decomposition

• Single Replacement

• Combustion

Which type of reaction is:

2 H₃AsO₄ → As₂O₅ + 3 H₂O

• Synthesis

• Decomposition

• Single Displacement

• Combustion