AS Cie chemistry Paper 3 revision

Which ion is identified here?

• Copper

• Potassium

• Lithium

• Sodium

This image shows the end-point of an acid-base titration. The analyte is an acid and the titrant is a base. Which colored indicator was used?

• Thymolphthalein

• Potassium manganate

• Methyl orange

• Phenolphthalein

What is the correct formula for calculating the heat energy transferred of a reaction?

• Q=mcΔT

• ΔH=Q/moles

• Q=mcΔH

• ΔT=mc/moles

Use the Hess' law to calculate the enthalpy change of this reaction.

• • - 68 KJ

• • + 294 KJ

• • + 68 kJ

• • 294 kJ

Which ions give this type of precipitate when mixed with NaOH?

• Al 3+

• Fe 3+

• Cu 2+

• Ca 2+

Consider this balanced chemical equation. The number of moles of iron (III) oxide used is : 0.575 moles. What is the number of moles of aluminium?

• 0.288 moles

• 0.575 moles

• 1.000 moles

• 1.150 moles

A solution of sulfate ions forms a white precipitate when HCl and ...... are added to it. What are the missing words?

• Barium ions

• Silver nitrate

• Sodium hydroxide

• Nitric acid

A 250 cm3 volumetric flask has an error of ± 0.10 cm3. What is the maximum percentage error of the volumetric flask?

• 0.25 %

• 0.1 %

• 0.04 %

• 0.025%

Calculate the heat absorbed by 105.0 grams of water when it is heated to cook spaghetti. The initial temperature of the water is 20.0°C, and the final temperature of the water is 99.0°C. The specific heat of water is 4.18 J/g•°C.

• 8778 J/g°C
• 0.0005 J/g°C
• 34673 J/g°C
• 43451.1 J/g°C

If the reaction C(g) + O₂(g) + 191.2 kJ -> CO₂ (g) occurred in a beaker, what would you observe?

• the test tube getting hot

• the test tube getting cold

• the test tube changing color

• None of the above