Question 1: One Word Items

SECTION A

QUESTION 1: ONE WORD ITEMS

GIVE ONE word/term for each of the following descriptions. Write only the word /term next to the question number

1.1 Afubau in atoms means (1)

1.2 The energy required to remove an electron from an atom (1)

1.3 Rows on a periodic table are called? (1)

1.4 The sphere on earth that consists of all our water? (1)

1.5 A mixture with all its components in different phases (1)

[Total 5] 2.6 The chemical behaviour of an element is determined by the number and arrangement of its…

A protons

B neutrons

C electrons

D atoms (2)

2.7 Elements in Group Vii of the periodic table usually…

A form large molecules

B gain electrons when bonding

C act like metals

D solidify at room temperature. (2)

2.8 Which one of these is a homogeneous mixture?

A Carbon dioxide B Sea water C Cobalt chloride D Barium carbonate (2)

2.9 Ionic bonds form because of very strong forces of attraction between oppositely charged ions. From this we conclude that ionic compounds ...

A are electrically neutral. B have high melting points C conduct electricity D are gaseous compounds (2)

2.10 The minimum energy required to remove the first or least bound electron from a gaseous atom is called….

A kinetic energy B exothermic energy C endothermic energy D ionisation energy (2)

GET AHEAD COLLEGE

GRADE 10

PHYSICAL SCIENCES : CHEMISTRY (P2)

JUNE 2012 MARKS: 100 TIME : 2HRS

JUNE EXAMINATION Name: Surname Grade

One word answers Matching items 1.6 1.1 1.2 1.7 1.3 1.8 1.4 1.9 1.5 1.10 Multiple choice 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 2.10 SECTION A

2.6 If Rutherford used neutrons, instead of alpha particles in his scattering experiment, the neutrons would ... A not deflect because it has no charge B have deflected more often C have been attracted to the nucleus easily. D have given the same results (2) 2.7 An atom Chlorine that has 18 electrons has… A become a negative ion B become a positive ion C become a neutral atom D an equal number of protons (2)

2.8 Which of the following is not an Inter-molecular force? A hydrogen bond B Van der Waal C covalent bond D instantaneous dipole (2)

2.9 The minimum energy required to remove the first or least bound electron from a gaseous atom is called…. A kinetic energy B exothermic energy C endothermic energy D ionisation energy (2)

2.10 The global systems on Earth consists of four major inter-connected systems or spheres The sphere that consists of all the rocks that forms the earth’s surface is called… A hydrosphere B biosphere C atmosphere D lithosphere (2)

[Total 20] Question 3

3.0 A player kicks a ball vertically into the air. The mass of the ball is 0,5 kg. The ball reaches a maximum height of 30 m.

3.1 Calculate the force that the earth's exerts on the ball. (4)

3.2 Calculate the gravitational potential energy gained by the ball at its highest point. (4)

3.3 Calculate the speed of the ball just before it hits the ground. (4)

Question 4

4.1 An object projected vertically upwards reaches its maximum height and returns to its original point of projection. Ignoring the effects of friction, the direction of the acceleration of the object during its motion is …

A always vertically downwards

B first vertically upwards and then vertically downwards

C first vertically downwards and then vertically upwards

D always vertically upwards. (3)

5a) Compare the Borh atomic model and the modern atomic model (3) b) Define the following terms and give an example of each

Valency heterogeneous mixture homogeneous mixture

Miscible solutions solvent solute isotopes c) Given that a neutral atom has 6 protons, find the following i) mass number

ii) atomic number

iii) valency

iv) write the electronic configuration

6. Sweety drops a ball from a bridge that is 25m above the river a) what is the ball's velocity just before it hits the river (4) b) How long does it take the ball to hit the water (4) c) Draw the shape of the ball's postion time graph, velocity-time and acceleration -time graphs (9)