MID TERM TEST FIRST TERM CHEMISTRY SS 1

FIRST TERM EXAMINATION 

                            Class: SS 1                      Subject: Chemistry 

SECTION A

1. The  constituent of ink can be separated by (a)Precipitation (b)Fractional distillation (c)Evaporated (d)All of the above (e) Choroma-rated
2. Separating funnel is used  in separating one of the following mixtures (a)Ethanol (b)Iodine and salt  (c)Propane  and  pro-none (d)Surd and water (e)Petrol and water 
3. In atomic structure, mass number can be represented by _______(a)Z (b)A (c)D (d)E
4. The molar mass of  KNO3 is _______ (k=39, N=14, O=16) (a)101 (b)98 (c)106 (d)100
5. The chemical symbol of iron is (a)IR (b)Fe (c)Io (d)On
6. One of the following is not a branch of pure science? (a)Chemistry (b)Geography (c)Physics (d)Biology
7. _______ is of a wide variety of use and it is made by chemical processes (a)Plastics  (b)Plastic (c)Margarine (d)Fats 
8. Rotten food is a typical example of what change?  (a)Periodical change (b)Chemical change  (c)Chemistry change (d)Physical change
9. _________ is a liquid, solid, or gaseous substance that is loosed which dissolves to give solution (a)Solvent (b)Solute  (c)Water (d)None of the above
10. Another name for characteristic  is ________ (a)Dissolution (b)Reverse (c)Properties (d)Crystalline
11. _________ is a substance that resolves (a)Solvent  (b)Solute (c)Hydrogen gas (d)Oxygen gas
12. __________ is a substance that contains two or more elements which (a)Element (b)Compound (c)Mixtures (d)Metals
13. One of the  following is always homogenous (a)Compound (b)Element (c)Mixtures (d)Atom
14. In the below P represent what?  Wood        P Ash + Gases (a)Evaporation (b)Burning (c)Chemical change (d)Physical change
15. Burning of magnesium ribbon in Bunsen is a typical example of what change (a)Chemical change (b)physical change (c)Characteristic change (d)Neutral characteristic change
16. Semi conductors of electricity are in other word called ______ (a)Metals (b)Non-metals (c)Element (d)Metalloids
17. All metals are solid  at room temperature except (a)Hydrogen (b)Zinc (c)Iron (d)Hg, Mecury
18. The negative particles in an element is called ______ (a)Proton (b)Metals (c)Cathodes (d)Electrons
19. An ______is any atom or group of atoms which possesses an electric charge (a)Atom (b)Cathode (c)Anion (d)Ion
20. The chemical symbol for Gold is _____ (a)Gu (b)Go (c)Ag (d)Au
21. Where an element exists as a molecule, a number representing it’s _______ is written as a subscript  (a)Formulae (b)Formulla (c)Atomicity (d)Symbol
22. One of the following is not part of Dalton’s atomic theory (a)All element are made up of small particles (b)atoms can neither be created nor destroyed (c)Atom of the same element are not alike (d)Atoms of the same are alike
23. The molecular formula of calcium trioxocarboate(iv) is _____ (a)CaONa2 (b)CaCO3 (c)CO3Ca2(d)Ca3CO3
24. What is the mass of 3 moles of oxygen, gas O2? (a)32g (b)96g (c)102g (d)36g
25. _______ is the combining power of an element (a)Atomicity  (b)Valency (c)Law of reciprocal (d)Mass of an element
26. The relative molecular mass of Pb(No3)2 lead II trioxonitrate v is (a)170 (b)22 (c)232 (d)132
27. 3NH3 is ________ (a)Three moles of ammonium (b)Three moles of ammonia (c)Six moles of ammonia (d)Six moles of ammonium

Stage X represents the process of ________ (a)Boiling (b)Condensation (c)Melting (d)Sublimation

1.  Separation of mixture of solids with various sizes include (a)Magnetic Separation (b)Coarsing (c)Sublimation (d) Sieving
2. Given the below elements and their respective ratios, what is the empirical formula of their compound? 

Carbon C, Hydrogen H, Oxygen O,

  1             2 1                     (a)H2C (b)CH2O (c)OCH2(d)None of the above

SECTION B

Attempt any three questions from this section, question 1 is compulsory

1.  State the two types of changes that matter undergoes.

1b. Give four distinctive  differences between mixtures and compound

1c. Highlight six careers  in the field of chemistry 

1. Tabulate the following substances into element, a mixture or a compound 

1. Limestone
2. Diamond 
3. Clay
4. Soil
5. Soap
6. Bronze
7. Sand
8. Sugar
9. Neon
10. Gold

       2b. Write briefly on each of the following 

1. Sieving 
2. Mixture
3. Compounds
4. Fractional distillation
5. Decantation (with the aid of diagram)

2c. Define 

1. An atom
2. A molecule

1. Calculate the relative molecular mass of each of the following compounds (Na=23, S=32, O=16,  Ca=40, Cl=35.5, C=12, Al=27)

1. Na2So4, Sodium   tetraoxosulphate VI
2. CaCL2,  Calcium Chloride 

1. Al2(So4)3,  Aluminum tetraoxosulphate V
2. CaCo3, limestone 

3b. What is chemistry? Explain chemistry in our daily life

3c. What do you understand by the following

1. Electrons
2. Mass number
3. Proton
4. Element

1. Differentiate between   the two types of mixtures with examples 

4b. what is empirical formula of an oxide of phosphorus that contain 43.6% phosphorus and 56.4% of oxygen. (P=31, O=16)

4c. Name the below compound using their oxidation numbers 

1. NO (Oxidation number of N=+2)
2. No_3