Chemistry Final exam

2 KClO₃ → 2 KCl + 3 O₂
How many moles of oxygen are produced when 6.7 moles of KClO₃ decompose completely?

• 6.7 mol
• 1.0 mol
• 10.1 mol
• 4.5 mol

Tags

NGSS.HS-PS1-7

 SiO₂ + 3C → SiC + 2CO
I need to add 8 moles of Carbon to the reaction. How many grams of Carbon should I weigh?

• _{96 g}
• 0.67 g
• 2.67 g
• 48 g

Tags

NGSS.HS-PS1-7

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

• 749 g
• 223 g
• 479 g
• 814 g

Tags

NGSS.HS-PS1-7

Fe (s) + S (l) --> FeS (s)  

In the experiment above, 7.62 g of Fe are allowed to react with 8.67 g of S.
How much FeS is formed?

• 14.8 g
• 12.2 g
• 13.7 g
• 19.9 g

Tags

NGSS.HS-PS1-7

What type of reaction is represented 2H2  + O2 = 2H2O?

• Decomposition
• Combustion
• Synthesis
• Neutralization

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

What type of reaction produces carbon dioxide and water?

• Neutralization
• Synthesis
• Decomposition
• Combustion

What is the name of the following reactants?

• hydrogen chloride plus sodium hydroxide.
• hydrochloric acid plus sodium hydroxide.
• dihydrogen monoxide plus sodium hydroxide.
• dihydrogen monoxide plus sodium chloride.

What are the correct coefficients to balance the equation?

• 1, 1, 1, 1
• 1, 2, 1, 2
• 2, 1, 2, 1
• 2, 3, 2, 4

Tags

NGSS.HS-PS1-7

What is the molar mass of iron (III) oxide?

• 72 g
• 200 g/mol
• 104 g/mol
• 160 g/mol

Tags

NGSS.HS-PS1-7

What is the mass of 2 moles of propane (C3H8)?

• 44 g
• 88 g
• 22 g
• 13 g

Tags

NGSS.HS-PS1-7