b) The gas spread itself uniformly throughout any containers.
(c) Indicators are required in all types of titrations.
(d) Solid sodium chloride conducts electricity.
(e) Reduction brings about a decrease in oxidation number.
(f) Catalysts are not consumed by the chemical reactions.
(g) The reaction between joule and calorie is `1J=4.18 cal.
- Fill in the blanks with the correct word(s) ,terms. (7 marks)
(a) Sodium hydroxide is commercially produced from saturated solution of ………. by using electrolysis.
(b) The properties of steel depend upon the ……….. .
(c) Ammonia gas has a characteristic ………. smell.
c) The velocity of light in air is _____ ms-1.
(d) The electrons closer to the nucleus are called _____ electrons. - (a) State the laws of reflection of light. Find the wavelength of a wave with frequency 1000 Hz and velocity
344 ms-1. (3 marks )
(b) A concave mirror can produce an image which is twice the size of the object. Draw a ray diagram to show
this. (3 marks ) - (a) Define specific heat capacity. A calorimeter at 15 ℃ contains 0. 1 kg of carbon. The calorimeter is made
of aluminum and its mass is 0.02 kg. When 892 J of heat is added to the calorimeter and carbon, the
temperature increases to 28 ℃ . Find the specific heat capacity of carbon. Assume that the specific heat
capacity for aluminum at said temperature range is 900 J kg-1 K-1. (3 marks )
(b) A radar antenna of a wave with frequency 1000 Hz and wavelength 0.5 m. (3 marks ) - (a)The glancing angle of a ray incident on a plane mirror is 60° . Find the angle between the incident ray and
the new reflected ray when the plane mirror is rotated(a) through 15° in the clockwise direction,(b)through
30° in the anticlockwise direction.