Looking Back C1, C2, C3 & C4

​CHEMISTRY

​Looking C1, C2, C3 & C4

​

Multiple Choice

How can you stop the movement of particles?

• Increase the temperature

• Decrease the temperature

• You can't.

• Hold them still with your hands.

Open Ended

Multiple Choice

What is the name of this separation technique?

• Simple distillation

• Fractional distillation

• Boiling

• Evaporation

Multiple Choice

Which of the following statements tells us that a sample of liquid is pure water?

• It is colourless.

• It leaves no residue when filtered.

• It boils at 100^oC.

• It is odourless.

Multiple Choice

Which separation technique is used to obtain pure water from seawater?

• Simple distillation

• Filtration

• Chromatography

• Evaporation

Multiple Choice

What is the name of this separation technique?

• distillation

• filtration

• evaporation

• chromatography

Multiple Choice

What is the physical property on which fractional distillation depends?

• different boiling points

• different melting points

• different solubilities

• different densities

Multiple Choice

Which ink is most soluble?

• Blue

• Red

• Yellow

• Green

Multiple Choice

Which ink is a mixture?

• Blue

• Red

• Yellow

• Black

Multiple Choice

Referring to the chromatogram, black ink contains

• Blue, red and yellow ink only

• Blue, red, yellow and green ink

• Blue and yellow ink

• Black ink only

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Multiple Choice

Pure Copper Sulphate Crystals can be obtained by ________.

• Centrifugation

• Distillation

• Crystallisation

• Filtration

Multiple Choice

The process of cooling of crystals should be done at a ________ rate

• Fast

• Moderate

• Slow

• Any

Multiple Choice

Crystallisation is based on the ____________

• Difference in melting point

• Difference in boiling point

• Difference in pressure

• Difference in solubility

Multiple Choice

• A

• B

• C

• D

Multiple Choice

A substance that cannot be separated or broken down into simpler substances by chemical means is?

• Mixture

• Element

• Compound

• Molecule

Multiple Choice

What do elements in the same group (family) have in common with each other?

• Properties and valence electrons

• Atomic number and valence electrons

• Chemical symbol and atomic mass

• Atomic mass and atomic number

Multiple Choice

Which element has similar properties to Chlorine (Cl)? 

• Fluorine
• Sulfur
• Boron
• Oxygen

Multiple Choice

How many electrons does Si contain? (click to see image)

• 14
• 28
• 2
• 4

Multiple Choice

Neon has 10 electrons. The electrons fill the energy levels in Neon like this...

• Two in the first, four in the second and four in the third.

• Four in the first, Four in the second and two in the third.

• Two in the first and eight in the second.

• Two in the first, two in the second and six in the third.

Multiple Choice

What does the nucleus consist of?

• Protons + Electrons
• Neutrons + Electrons
• Atoms
• Protons + Neutrons

Multiple Choice

Isotopes are the atoms of the same element with the same number of.............. but different number of............

• electrons/neutrons

• neutrons/protons

• protons/neutrons

• electrons/protons

Multiple Choice

What do these isotopes of carbon all have in common?

• neutrons & mass number

• atomic number and neutrons

• atomic number

• protons, atomic number, and mass number

Multiple Choice

How many VALENCE ELECTRONS does Chlorine have?

• 2

• 7

• 8

• 10

• 17

Multiple Choice

Why are the noble gases so unreactive?

• They made a group decision not to react

• They have a large number of electrons

• They don't like to give up electrons

• They have a full outer shell of electrons

Multiple Choice

A charged particle that has gained or lost electrons is called a _____.

• molecule
• ion
• isotope
• element

Multiple Choice

What usually forms the positive ion?

• Metal

• Nonmetals

• None

Multiple Choice

Metals form ions by _____________ electrons, nonmetals form ions by   ___________ electrons. 

• losing, gaining
• gaining, losing
•  losing, losing
• gaining, gaining

Multiple Choice

Which of these statements about the halogens is incorrect?

• They are reactive because they easily gain one electron

• They form ions with a charge of +1

• They include fluorine, chlorine, bromine and iodine

• They get less reactive as their atomic number increases

Multiple Choice

The laboratory test for oxygen is that

• it relights a glowing splint

• it relights a burning splint

• it changes lime water to milky

• it makes a glowing splint go out

Multiple Choice

Turns limewater milky

• Hydrogen

• Oxygen

• Ammonia

• Carbon dioxide

Multiple Choice

Makes a squeaky pop sound when lit

• Hydrogen

• Oxygen

• Chlorine

• Ammonia

Multiple Choice

What metal was found in the unknown?

• sodium

• lithium

• copper

Multiple Choice

Why do you think are there different colors emitted?

• Because of the absorption of heat from the flame

• Because heat is released

• Because of the absorption of light

Multiple Choice

What particles in the heated compounds are responsible for the production of the colored light?

• proton

• neutron

• electron

• proton and neutron

Multiple Choice

What compound gives off red color when heated over a flame?

• Lithium

• Strontium

• Potassium

• Calcium

Multiple Choice

What is the color of the light that potassium compounds give off?

• Yellow-orange

• Purple

• Pinkish red

• Green

Poll

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