Mixtures and Analysis questions

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Mixtures and Analysis question collection

Review Mixtures and Analysis questions for Chemistry, with correct answers shown and coverage across choosing which mixture can paper chromatography separate; working with paper chromatography, the solvent is called the; working with paper chromatography, the paper is the.

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Question 1

Which mixture can paper chromatography separate?
  1. Dyes dissolved in a solvent
  2. Sand suspended in water
  3. Oil floating on water
  4. Iron mixed with sulfur

Question 2

In paper chromatography, the solvent is called the?
  1. Mobile phase
  2. Stationary phase
  3. Catalyst phase
  4. Indicator phase

Question 3

In paper chromatography, the paper is the?
  1. Stationary phase
  2. Mobile phase
  3. Reactant phase
  4. Gas phase

Question 4

Why is a chromatography baseline drawn in pencil?
  1. Graphite does not dissolve in the solvent
  2. Graphite moves ahead of the solvent front
  3. Graphite reacts with the sample spots
  4. Graphite makes every spot travel farther

Question 5

Which interpretation is most likely when a sample gives one chromatogram spot?
  1. One pure substance
  2. Several separated dyes
  3. An element rather than a compound
  4. A gas rather than a liquid

Question 6

If a sample gives several spots on a chromatogram, it is likely to be?
  1. A mixture
  2. A pure compound
  3. A catalyst
  4. A neutral solution

Question 7

What is the test for oxygen gas?
  1. A glowing splint relights
  2. A lit splint gives a squeaky pop
  3. Limewater turns milky
  4. Damp red litmus turns blue

Question 8

What is the test for hydrogen gas?
  1. A lit splint gives a squeaky pop
  2. A glowing splint relights
  3. Limewater turns milky
  4. Orange bromine water decolourises

Question 9

What is the test for carbon dioxide gas?
  1. Limewater turns milky
  2. A glowing splint relights
  3. A lit splint gives a pop
  4. Damp blue litmus turns red

Question 10

Which gas bleaches damp litmus paper?
  1. Chlorine
  2. Hydrogen
  3. Oxygen
  4. Nitrogen

Question 11

What colour is universal indicator in a strong acid?
  1. Red
  2. Green
  3. Blue
  4. Purple

Question 12

What colour is universal indicator in a neutral solution?
  1. Green
  2. Red
  3. Blue
  4. Orange

Question 13

How would you classify a solution with pH 2?
  1. Strongly acidic
  2. Neutral
  3. Weakly alkaline
  4. Strongly alkaline

Question 14

How is a solution with pH 11 classified?
  1. Alkaline
  2. Strongly acidic
  3. Weakly acidic
  4. Neutral

Question 15

What does the symbol equation \(\mathrm{HCl} + \mathrm{NaOH} \to \mathrm{NaCl} + \mathrm{H}_2\mathrm{O}\) represent?
  1. Neutralisation
  2. Combustion
  3. Thermal decomposition
  4. Displacement

Question 16

Why compare an unknown chromatogram with known standards?
  1. To identify substances by matching spot positions
  2. To count substances from the solvent colour
  3. To identify substances from paper length
  4. To change how far the unknown spots travel

Question 17

Why must chromatography samples start above the solvent level?
  1. So they do not dissolve into the solvent reservoir
  2. So the solvent cannot rise through the paper
  3. So every dye travels at the same speed
  4. So the baseline moves with the solvent

Question 18

What is the solvent in a solution?
  1. The substance that dissolves the solute
  2. The substance that is dissolved
  3. The solid left after filtration
  4. The liquid collected after condensation

Question 19

How is a solution with pH 7 classified?
  1. Neutral
  2. Strongly acidic
  3. Weakly acidic
  4. Strongly alkaline

Question 20

Which method separates oil from water?
  1. A separating funnel
  2. Paper chromatography
  3. Simple distillation
  4. Evaporation to dryness

Question 21

Why do dyes separate during paper chromatography?
  1. They differ in solubility and attraction to paper
  2. They have identical solubility and attraction
  3. They react to make new dyes
  4. They contain different numbers of protons

Question 22

What is a pure substance?
  1. One element or one compound
  2. Two elements mixed in any proportion
  3. A compound dissolved in water
  4. Several compounds blended together

Question 23

What does a sharp melting point usually indicate?
  1. A pure substance
  2. A mixture of substances
  3. An impure metal sample
  4. A solution containing a solute

Question 24

Which mixture can filtration separate?
  1. Sand and water
  2. Salt dissolved in water
  3. Ethanol mixed with water
  4. Two gases mixed together

Question 25

What can evaporation obtain from a solution?
  1. The dissolved solid
  2. The collected solvent
  3. An insoluble residue
  4. A mixture of gases

Question 26

Which mixture can simple distillation separate?
  1. Water from salt solution
  2. Sand from water
  3. Iron from sulfur
  4. Dyes in black ink

Question 27

What is crystallisation used to obtain?
  1. Pure solid crystals from a solution
  2. An insoluble solid by filtration
  3. A solvent collected by distillation
  4. Dyes separated on paper

Question 28

What is the residue in filtration?
  1. Insoluble solid left on the filter paper
  2. Liquid that passes through the filter paper
  3. Dissolved solid carried through the filter
  4. Water used to wash the filter paper

Question 29

What is the filtrate in filtration?
  1. Liquid that passes through the filter paper
  2. Insoluble solid left on the filter paper
  3. Filter paper after it has dried
  4. Mixture before it enters the filter

Question 30

Why are crystals dried after crystallisation?
  1. To remove solvent left on their surfaces
  2. To dissolve them back into the solution
  3. To increase their size after filtering
  4. To change them into a new compound

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Review Mixtures and Analysis questions for Chemistry, with correct answers shown and coverage across choosing which mixture can paper chromatography separate; working with paper chromatography, the solvent is called the; working with paper chromatography, the paper is the.

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