Chemistry year 11

Which statement about liquids is correct?

• They have a fixed shape and a fixed volume.

• They have a fixed shape but not a fixed volume.

• They have no fixed shape but they do have a fixed volume.

• They have no fixed shape and no fixed volume.

Pure copper chloride can be obtained from a mixture of powdered copper and solid copper chloride.

Three stages in the method are listed.

P add water and stir

Q crystallise

R filter

In which order are these stages carried out in order to obtain pure copper chloride from the mixture?

• P → Q → R

• P → R → Q

• R → P → Q

• R → Q → P

What are the products of the electrolysis of concentrated aqueous sodium chloride?

• chlorine, hydrogen and sodium

• chlorine, hydrogen and sodium hydroxide

• chlorine and hydrogen only

• chlorine and sodium only

Which statement describes an exothermic reaction?

• Heat energy is transferred from the surroundings and the temperature decreases

• Heat energy is transferred from the surroundings and the temperature increases

• Heat energy is transferred to the surroundings and the temperature decreases.

• Heat energy is transferred to the surroundings and the temperature increases.

What is the formula to calculate moles from mass?

• moles = mass (g) * molar mass (g/mol)

• moles = mass (g) + molar mass (g/mol)

• moles = mass (g) - molar mass (g/mol)

• moles = mass (g) / molar mass (g/mol)

How many moles are in 32 grams of oxygen gas (O2)?

• 1 mole

• 4 moles

• 0.5 moles

• 2 moles

If you have 2 moles of a solid substance, how many grams do you have if its molar mass is 58 g/mol?

• 1160 grams

• 2 grams

• 58 grams

• 116 grams

How do you calculate the number of moles in a solution?

• moles = density (g/mL) × volume (L)

• moles = concentration (mol/L) × volume (L)

• moles = mass (g) / volume (L)

• moles = concentration (mol/L) + volume (L)

What is the relationship between moles and molecules?

• One mole contains 12 molecules.

• One mole is equal to 1,000 molecules.

• One mole is the same as 6.022 x 10^22 molecules.

• One mole contains approximately 6.022 x 10^23 molecules.

If you have 0.5 moles of a substance, how many molecules do you have?

• 3.011 x 10^23 molecules

• 2.5 x 10^23 molecules

• 6.022 x 10^22 molecules

• 1.204 x 10^24 molecules