S1 Chemistry Test 1

Gap-fill exercise

  
Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
1. (i) A fuel is a substance that gives off when ignited or energy.

(ii) common sources of energy include:

b) Uses of some parts of a bunsen burner.

The base is the flattened stand that the burner in an upright position.
The airhole allows in to enter the burner so that it mixes with the gas from the jet.
The collar the entrance of air from the airhole by making the airhole smaller or bigger.
The chimney transmits the mixture of gas and air up the top where it is .
The jet is where the gas enters into the burner, providing the necessary that pushes the gas through the chimney.

2. a) (i) The boiling point of a liquid is the constant at which the vapour pressure of a liquid is equal to the .

(ii) some factors that affect boilin point of a liquid include;
- presence of .
-
- pressure.

b) The boiling point of paraffin maybe obtained in the following way:
- water is put in a beaker and .
- The bunsen flame is turned
- Paraffin is put in a boiling tube and the boiling tube is fitted with a cork and positioned in the liquid but not touching the bottom of the tube.
- The temperature reading is taken when a temperature is attained. This is the boiling point.

3. a) Kinetic theory of matter states that matter is made up of small which are in a state of motion.

b) (i)
SolidGas
i) Particles are packedParticles are apart
ii) Forces of attraction are very Forces of attraction are very
iii) Have a shape and volume shape or volume, and occupies space available.
iv) Particles rotate and slightly in their fixed positionParticles move and easily about.


b (ii) A common example of a compound that exists naturally in gaseous state is .

c (i) Diffusion reffers to the movement of particles from a region of to another region of .

d. A simple experiment to illustrate diffusion in solids may be carried out as follows:
- A is half filled with water.
- A small of potassium manganate (VII) is added
- The set up is left to for a few minutes.

Observation:

The colour of the crystal from the crystal through out the water.

Conclusion:

Potassium permanganate is made of small particles which when put in water.