Chemistry is defined as

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FIRST TERM EXAMINATION

CLASS: S.S.S 1

INSTRUCTION: ANSWER ALL QUESTIONS IN THIS SECTION

Chemistry is defined as ________________ (a) a branch of knowledge which produces chemicals (b) a branch of science which makes physics and biology clearer (c) the oldest branch science (d) the branch of science which deals with change in matters

The symbol for element potassium is ________ (a) k (b) p (c) pt (d) Cr
One of these profession has no need for chemistry (a) miner (b) engineer (c) philosophers (d) geologist
________ is an example of gaseous elements (a) calcium (b) neon (c) potassium (d) zinc

The atomicity of ozone is (a) 1 (b) 2 (c) 3 (d) 4
Atom is ________ (a) the smallest part of a substance that can take part in a chemical change (b) the smallest part of an element which can take part in a chemical change (c) the smallest part of a compound which can take part in chemical change (d) the smallest part of a lattice which can take part in a chemical change
The only liquid metal on earth is ________ (a) sodium (b) carbon (c) mercury (d) gold

________ can be used to pick hot objects from flame source (a) hot taker (b) test tube (c) beaker (d) thong
________ can be used to dry anhydrals substance to obtain crystals (a) burette (b) reagent bottle (c) desicator (d) dryer
Which of the following element is not a metal (a) aluminium (b) sodium (c) chlorine (d0 magnesium

All are laboratory apparatus except ________ (a) licker (b) beaker (c) round bottom flask (d0 flask bottom flask
All physical changes are ________ (a) non – reversible (b) easily reversible (c) spontaneous (d) dark
________ states that electron should be single filled into degenerate orbital before double filling (a) Aufbau (b) Paul exclusion principle (c) Hund’s ruel (d) electron rule

The chemical formular for calcium hydroxide is (a) Ca [0H]₃ (b) Ca0 (c) Ca0H (d) Ca[0H]₂
The oxidation number of carbon is CaC0₃ is ________ (a) + 2 (b) +4 (c) +3 (d) +1
The content of mixture are ________ combined (a) physically (b) chemically (c) biologically (d) mentally

All chemical changes are ________ (a) non reversible (b) basicly reversible (c) spontaneous (d0 dark
Which of this is the same in isotopes of an element? (a) mass number (b) number of neutron (c) number of proton and neutron (d) the atomic number
The rare gases are stable because they ________ (a) are mono atomic (b) have duplex or octect electronic configuration in the outermost shells of their atoms (c) have no neutrol in their nucleus (d) are volatile gases

A molecule is the smallest particle of ________ (a) a matter that can exist in free state (b) an element that can exist in free state (c) a lattice that can emit in a free state (d) a substance which still maintain the chemical properties of the compound

THEORY (ANSWER FOUR ONLY)

1a. Define chemistry

b. Explain the concept of scientific approach

c. List ten laboratory apparatus and give one uses of any five

2a. What is matter

b. Differentiate between mass and weight

c. Mention the states of matter and use the triangle diagram to show their inter-relationship

3a. What are elements

b. Mention the first 20 elements and give their symbols

4a. State the following

(i) Aufbau principle (ii) Hund’s rule

(iii) Paulin exclusion principle

b. Show the orbital configuration for (a) Na (b) Ne (c) K (d) Ca (e) N (f) Al (g) Cl

5a. Define mixture

b. Mention five (5)separation techniques and write short note on two only

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