Realize Chemistry Materials

Oxidation is a process which involves

• addition of oxygen

• addition of hydrogen

• removal of oxygen

• removal of hydrogen

MnO² + 4 HCl → 2 + 2H²O + Cl²

^{Identify the substance oxidized in the above equation.}

• MnCl²

• HCl

• H²O

• MnO²

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Balance the chemical reaction:

CH₃NH₂ + O₂ → CO₂ + H₂O + N₂

• 2CH₃NH₂ + 9O₂ → 4CO₂ + 10H₂O +2N₂

• 4CH₃NH₂ + 9O₂ → 4CO₂ + 10H₂O +2N₂

• 2CH₃NH₂ + 9O₂ → 4CO₂ + 2H₂O +2N₂

• 4CH₃NH₂ + 6O₂ → 4CO₂ + 10H₂O +2N₂

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

Na₂S₂O₃+ AgBr → NaBr + Na₃(Ag(S₂O₃)₂)

How many moles of Na₂S₂O₃ are needed to react completely with 42.7 g of AgBr?

• 0.352 mol Na₂S₂O₃

• 0.455 mol Na₂S₂O₃

• 0.235 mol Na₂S₂O₃

• 0.654 mol Na₂S₂O₃

Tags

NGSS.HS-PS1-7

One type of anaerobic respiration converts glucose,C₆H₁₂O₆,to ethanol,C₂H₅OH and carbon dioxide.If the molecular weight of glucose is 180 gmol^-1 and the molar mass of ethanol is 50 gmol^-1, how many grams of carbon dioxide are produced when 1 mol of glucose is digested via respiration?

• 40 grams

• 20 grams

• 0 grams

• 80 grams

Tags

NGSS.HS-LS2-3

When 10g of Cooper and 10g of Iodine are mixed, 5g of CuI are obtained, what is the percentage of yield?

• 15%

• 67%

• 33%

• 31%

Tags

NGSS.HS-PS1-6

NGSS.HS-PS1-7

When Na react with Cl₂ , we calculated that the theorical yield should be 12.5 grams. Our actual yield was 13.0 grams.What is the percentage yield?

• 100%

• 104%

• 96%

• 1.04%

Cr³⁺ + Cl₂ → CrO₄^2- + Cl^-

For the above reaction,which one is the oxidizing agent and the reducing agent?

• Cl₂ ,Cr³⁺

• Cr³⁺, CrO₄^2-

• Cl₂ , CrO₄^2-

• Cr³⁺,Cl₂

Tags

NGSS.HS-PS1-2

C₅H₁₂ + 8O₂→ 5CO₂ + 6H₂O

Which is limiting reactant in the reaction?

• C₅H₁₂

• O₂

• CO₂

• H₂O

Tags

NGSS.HS-PS1-7

What is the concentration of an aqueous solution of H₂SO₄ if 25.00mL of the solution is neutralised by 15.00mL of 0.75 M NaOH?

• 0.2250 M

• 0.2115 M

• 0.1770 M

• 0.0225 M

Tags

NGSS.HS-PS1-7