Revision: 2nd term test

  1. Water recycle is NOT required.
  2. Contents in first term will only show in the Multiple Choice (or T / F) sections.
  3. The last topic covered in 2nd test week is Magdebury Hemisphere
  4. There are 4 vocabulary lists at the end this webpage
  1. Workbook: Chapter 16 (Page 50 to 57)
  2. Workbook: Integrated Exercise (Page 62,63 and 65)
  3. Workbook: Chapter 17 (Page 70 to 75)
  4. Workbook: Chapter 18 (Page 76 to 82)
  5. Workbook: Chapter 19 (Page 83 to 84)

Question: Choose 3 correct inventions from the following.

Mobile phone
correct
Gun power
correct
Paper
correct
Oxygen
INCORRECT! Oxygen exists in nature.Invention means something that has NEVEN HAVE BEEN MADE BEFORE, or the process of creating something that has never been made before

Question: Choose 3 correct matchings from the following.

Physics: Study of force, light, pressure...
correct
Chemistry: Study of space and universe
INCORRECT! Chemistry is the study of structure of matter and chemical reactions of matter...
Biology: Study of living things..
correct
Geology: Study of earth..
correct

Question: Choose 3 correct answers from the following.

In a fair test, we need to keep all variables the same.
INCORRECT! We should keep all variables the same except the one(dependent variable) that we are going to study
If we are going to measure the height of plant each day, the day 1 and onwards should be the independent variable, the height of plant is the dependent variable
correct
The sunlight, amount of water to water the plant, soil... are the controlled variables. They should be kept the same.
correct
In plotting the graph, x-axis is the independent variable(Day);y-axis is the dependent variable(height)
correct

Question: Choose 5 correct matchings from the following.

Unit (ml or cm3): apparatus (measuring cylinder)
correct
Unit (degree Celcius or oC): apparatus (thermometer)
correct
Unit (PS) : apparatus (pressure gauage)
INCORRECT! Unit of pressure should be Pa, Pascal, kg/cm2 etc not PS
Unit (g or kg) : apparatus (electronic balance)
correct
Unit (cm or m) : apparatus (ruler of measure tape)
correct
Unit (s or hr) : apparatus (stop watch)
correct

Choose one correct answer about energy changes in electric car.

electric energy(in motor) > kinetic energy(in motor)
INCORRECT!
chemical energy(in battery) > kinetic energy(in motor)
INCORRECT!
chemical energy(in battery) > kinetic energy(in motor) > sound energy (in motor)
INCORRECT!
chemical energy(in battery) > electrical energy(in motor) > kinetic energy(in motor) + sound energy (in motor)
correct

Answer Question by referring to the following diagram.

Question: Choose 3 correct matchings from the following.

B: funnel
correct
P:test tube holder
INCORRECT!
F:reagent bottle
correct
D:dropper
correct

Question: Diagram A is measuring cylinder.

True
correct
False
INCORRECT!

Question: Choose 3 correct answers from the following.

Measuring cylinder can measure volume of solution accurately
correct
Beaker can measure volume of solution accurately
INCORRECT! Beaker is not for measuring volume.
Drop is used to transfer small amount of liquid but it is not for measuring volume.
correct
Volume of boiling tube is larger than test tube, it is more suitable to heat solution using boiling tube.
correct
E:Gas jar can measure volume of gas.
INCORRECT! Gas jar is not for measuring volume. It uses to collect gas

Question: Spatula(spoon) can use to stir solution.

True
INCORRECT!Spatula can only transfer solid and use to scratch glass beaker
False
We can only use glass rod to stir solution

Answer Question by referring to the following diagram

Question: Choose 3 correct matchings from the following.

A:flammable
correct
B:corrosive
correct
C:toxic
correct
D:explosive
INCORRECT! The label is called harmful

Question: Which two harzard warning labels should be put on thinner?

A
correct
B
INCORRECT!
C
correct
D
INCORRECT!

Video 1: Growing large crystal of Copper(II) Sulphate
Watch the following video and answer the questions that follow

Question: Choose 3 correct answers from the following.

When temperature of solvent increases, the solvent cannot usually dissolve more solute
INCORRECT! Solubility usually increases when temperature rises
Copper Sulphate solid is blue in color.
correct
The Copper Sulphate solution becomes deepen (dark blue) when more copper sulphate dissolves
correct
When there is blue Copper Sulphate solid at the bottom of the beaker, it cannot dissolve any more solid.
correct

Question: The following are steps to grow LARGE copper sulphate crystal but they are not in correct order.

  1. Continue adding the solid until the solution cannot dissolve anymore.
  2. Stir the solution with glass rod to dissolve the solid.
  3. Add copper sulphate solid to hot water in beaker using spatula.
  4. Cool the solution slowly and stand overlight.

Which of the following is the correct order?

A:2 > 3 > 4 > 1
INCORRECT!
B:1 > 4 > 3 > 2
INCORRECT!
C:3 > 1 > 3> 4
INCORRECT!
D:3 > 2 > 1 > 4
correct

Question: Choose 3 correct answers from the following.

1:The copper sulphate solution is saturated when there is blue solid at the bottom of the beaker.
correct
2: If the solution is saturated, stirring the solution can dissolve more solid.
INCORRECT! Solubility usually increases when temperature rises
3:When hot saturated Copper Sulphate solution cools, the solution becomes light blue because more copper sulphate form solid crystals,the amount in solution become smaller. The total amount of copper sulphate does not change.
correct
4:Solid copper sulphate dissolves in hot water during the experiment because hot water can dissolve more solute. Crystal forms EASILY when the solution cools.
correct

Video 2:What is solubility?
Watch the following video and answer the questions that follow

Question: Choose 3 correct answers from the following.

1:Solubility is measured using 100g of water. 34g copper sulphate can dissolve in 50g water. Then, the solubility is 68g.
correct
2: Solubility increases when volume of solvent increases.
INCORRECT! Solubility is measured using 100g of water. If you use smaller amount of solid, solubility will be the same after you have change the ratio of water to 100g
3: "How many gram" of solute can dissolve in water is different from solubility.
correct
4. Temperature will affect solubility.

Video 3:Three phrases of matters
Watch the following video and answer the questions that follow

Question: Solid and liquid have fixed shape.

True
INCORRECT!
False
correct Liquid does not have fixed shape, liquid will take up shape of container.

Question: Solid, liquid and gas have similar volumes when the states of matter change.

True
INCORRECT!
False
correct When liquid changes to gas, it expands and distance between gas particles will be much larger

Question: Only gas is compressible.

True
correct. When liquid changes to gas, it expands and distance between gas particles will be much larger
False
INCORRECT!

Question: Liquid and gas particles can move freely.

True
correct. Solid particles can only vibrate. They cannot move from one place to another
False
INCORRECT! Solid can only VIBRATE in fixed position

Video 4:Melting(freezing), boiling(condensation)
Watch the following video and answer the questions that follow

Question: Choose 3 correct answers from the following.

melting: solid --> liquid
correct
boiling(evaporation): liquid --> gas
correct
freezing:gas --> liquid
INCORRECT! Gas to liquid should be condensation, freezing is liquid --> gas
freezing point of water and melting point of ice is the same, both are zero degree celcius
correct

Question: An element changes from solid to liquid at -101oC and it changes from liquid to gas at -34oC. Choose 3 correct answers from the following:

Melting point is higher than boiling point
INCORRECT! Melting point is lower because less energy is used to make the particles in solid flow but much more energy is required to increase distances between gas particles in liquid
If room temperature is 25oC, the gas has been melted and boiled
correct
The gas becomes liquid when it is cooled from 25oC to -35oC
correct
freezing point of water and melting point of ice is the same, both are zero degree celcius
correct

Video 5 : What is an atom? (you only need to cover the difference between atom and molecule, electrons and shell are not required)

Video 6 : Atom, Element and Compound ?
Watch the following video and answer the questions that follow

Question: Atom is the SMALLEST UNIT of matter. It cannot further divide into smaller unit(i.e. indivisible). Which one is an atom?

A
INCORRECT!
B
INCORRECT!
C
INCORRECT!
D
INCORRECT!
E
correct

Question: Element is made up of ONLY ONE KIND of atom, which two are elements?

A
correct
B
correct
C
INCORRECT!
D
INCORRECT!
E
INCORRECT!

Question: Compound is made up of MORE than ONE KIND of atoms, which two are compounds?

A
INCORRECT!
B
INCORRECT!
C
correct
D
correct
E
INCORRECT!

Video 7:Explain principle of Magedbury hemisphere
Watch the following video and answer the questions that follow

Question: Choose 3 correct answers from the following

We cannnot feel pressure because air pressure is balanced by pressure inside our body
correct.
Before suction bump of Magedbury is powered on, air pressure (OR the density of air particles) inside and outside of hemispheres is balanced
correct.
When suction pump is powered on, the density of air particles inside the hemisphere increases
INCORRECT! Suction pump will remove and then decreases air density inside the hemisphere.
Force will push inwards from the surface of hemispheres after the suction pump is powered on.
correct. Suction pump will remove air particles and then decreases air pressure inside the hemisphere. The pressure outside the hemisphere is greater

Question: Choose 3 uses of air pressure from the following.

electric drill
INCORRECT! Electric drill uses electrical energy to convert to kinetic energy and sound energy. It does not use pressure.
Suction cup
correct.
Drinking straw
correct.
Collapse a drinking can using suction pump.
correct. Suction pump will remove air particles inside the can and then decreases air pressure inside the drinking can. The pressure outside the drinking can is greater

Vocabulary 1

Vocabulary 2

Vocabulary 3

Vocabulary 4