Question 1:

The correct formula is:

B. number of moles = concentration x volume in dm³

This is because concentration is typically expressed in mol/dm³ (moles per cubic decimeter), so multiplying by the volume in dm³ gives the number of moles.

If you have volume in cm³, you would first need to convert it to dm³ by dividing by 1000.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 2:

To find the number of moles, we use the formula:

Step 1: Convert the volume from cm³ to dm³.

Step 2: Multiply by the concentration.

So the correct answer is:

B. 0.00375 mol

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 3:

To find the volume, we rearrange the moles formula:

Step 1: Plug in the values.

Step 2: Convert from dm³ to cm³ (since the answer choices are in cm³).

So the correct answer is:

D. 90.0 cm³

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 4:

To calculate the amount in moles, use the formula:

Step 1: Plug in the values.

So the correct answer is:

A. 0.250

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 5:

To calculate the concentration, use the formula:

Step 1: We already calculated the moles of NaOH from the previous question:

Step 2: Convert the volume from cm³ to dm³.

Step 3: Plug into the concentration formula.

So the correct answer is:

C. 1.00 mol/dm³

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 6:

To solve this, we use the mole ratio from the balanced equation and the formula for volume.

Step 1: Find the mole ratio.

The balanced equation is:

The ratio is 1:1, so moles of KOH needed = moles of HBr = 0.0020 mol.

Step 2: Use the volume formula.

Volume (in dm³)=moles/concentration

Volume=0.0020 mol/(0.20 mol/dm³)=0.010 dm³

Step 3: Check the answer choices.

• C. 0.010 dm³ is correct.

If you wanted it in cm³, you would multiply by 1000 to get 10 cm³, but that is not listed as an option.

So the correct answer is:

C. 0.010 dm³

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 7:

For a titration, the most suitable apparatus is:

• Pipette – used to measure a fixed, accurate volume of the alkali (sodium hydroxide) that is being titrated.

• Burette – used to deliver variable, accurate volumes of the acid during the titration.

So the sodium hydroxide (25.0 cm³) should be measured with a pipette, and the sulfuric acid should be delivered from a burette.

Correct answer: B. pipette / burette

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 8:

To find the amount (in moles) of sulfuric acid used, use the formula:

Step 1: Convert the volume from cm³ to dm³.

Step 2: Multiply by the concentration.

So the correct answer is:

C. 0.00292

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 9:

To find the moles of sodium hydroxide (NaOH), we use the mole ratio from the balanced equation:

From the equation, 2 moles of NaOH react with 1 mole of H₂SO₄.
So the mole ratio is:

moles of NaOH=2×moles of H₂SO₄

Step 1: From the previous question, we calculated:

Step 2: Multiply by 2.

So the correct answer is:

B. 0.00584

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 10:

To find the concentration of the sodium hydroxide (NaOH) solution, use the formula:

Step 1: From the previous question, we know:

Step 2: Convert the volume of NaOH from cm³ to dm³.

The volume used was 25.0 cm³:

Step 3: Plug into the formula.

Rounded to three significant figures, this gives:

So the correct answer is:

A. 0.234 mol/dm³

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.