WorksheetsPre- Test Mid Sci
Total questions: 10
Worksheet time: 4mins
1. Which basic particle of an atom has positive charges?
electron
neutron
proton
nucleus
2. Which chemical symbol derives from Latin word?
Fluorine - F
Sodium - Na
Aluminium - Al
Calcium – C
Lord Ernest Rutherford said that “atoms are small particles that consist of protons and electrons”.
Which diagram below is the correct atomic model according to Rutherford?
4. Which of the following are all compounds?
Carbon, lithium, gold
Carbon dioxide, water, sucrose
Iron, table sugar, mercury
Magnesium, ammonia, calcium
5. Which of the following statement is true?
Compound is a pure substance which is made up of only one type of particles. Examples are gold, copper and oxygen.
Element is a pure substance produced from the chemical reaction of two or more atoms of different elements in a fixed ratio. Examples are water (H2O) and glucose (C6H12O6)
Molecule is the smallest unit of a substance that can exist freely.
Pure substance is not a homogeneous (uniform) substance.
6. When a substance changes its state from gas to liquid, it gives out heat. What is this process called?
evaporation
condensation
Melting
Freezing
7. Which of the following is not correct?
Soft drinks is a solution with particle diameters that are smaller than 10-7 centimeters.
Fresh milk is a colloid with particle diameters between 10-7 centimeters to 10-4 cemtimeters.
Mud water is a suspension with
particle diameters that are larger
than 10-4 centimeters.
Salad dressing is a colloid which uses egg yolk as emulsifier to
combine vegetable oil and vinegar.
8. Physical property of a substance is the external look that can be easily seen. Which of the following is not a physical property of a substance?
colour
hardness
texture
flammability
9. What is Tyndall Effect?
The effect of light scattering when it passes through colloids.
The effect of light scattering when it passes through solutions.
The effect of light scattering when it passe through suspensions.
The effect of light scattering when it passes through elements.
10. Which of the following is a homogeneous mixture?
gasoline
papaya salad
pizza
mama noodles
