Chemistry Grade 7 First Term Examination Portion Coverage, Answer Key and Work Sheet 2021

Chemistry Grade 7 First Term Examination Portion Coverage, Answer Key and Work Sheet 2021

Portion Coverage:

Chapter 1

How Science Works 

Exercise Page 16

Question 1

        a)     accuracy

        b)     sensitivity

        c)     reproducibility

        d)     precise

        e)     independent

        f)     dependent

        g)     control

        h)     valid

Chapter 2

Basic Ideas (complete)

Exercise Page 29

Question 1

        a)     atom; atoms; simpler

        b)     molecules; compounds

        c)     chemical; physical

Chapter 3

Atomic Structure (complete)

Exercise Page 38

Question 1

        a), b) and c) in any order: protons;                neutrons; electrons;

        1st row in table: +/positive; 1;

        2nd row in table: neutron;

        3rd row in table: electron; -/negative;

        centre/middle; electrons;                                nearest/closest; 2; 8

True and Falls.

  • The particles move from an area of low concentration to an area of high concentration is called diffusion. F
  • Molecules are groups of 2 or more atoms bonded together. T
  • Elements contain only one type of atom. T
  • Compounds contain 2 or more types of atom. T
  • Chemists use a kind of short-hand to describe molecules. It's called the symbol. F

Fill in the Blanks.

  • The particles move from an area of ----------------- concentration to an area of low concentration is called diffusion. High
  • Good scientists make sure their data provides evidence that is reliable and ----------------- . valid
  • You can use existing theories to explain---------------. Ideas
  • ---------------------------tells us how near the true reading your measurement is. Accuracy
  • I'm Elvis the Electron and I'm pretty quick, I fly round the nucleus at a fair old lick! The protons and I, we tend to attract, I'm ------------------- you see and that's a fact! Negative

Choose the Best.

1 There are 3 types of particle inside an atom.

a)Protons  b)neutrons  c)electrons

d)ALL

2 protons and neutrons have the same

b)Charge     c)color     d)smell

a)Mass

3 The first shell (nearest to the nucleus) can hold just ------- electrons.

a)4      c)5       d)6

b)2

4 the number of protons + the number of neutrons  =

a)Atomic size    b)atomic number    d)atomic charge

c)Mass number

5 lsotopes are atoms with the same number of protons, but different numbers of------.

a)Proton    b)electron    d)none of them

c)neutrons

------------------has definite shape and volume 


a Gas   b Liquid   d All of above

C   Solid

------------------ is an example of atom.

B  H2       C H2O            D  none of them

A He

Cl is the symbol of

A   Fluorine          b    Neon           c  Aluminium

D  none of the above

In ammonia number of Nitrogen is

B  2   C 3      d  4

A  1

State symbol of gas is 

A (s)    B   (l)   D All of the above

C (g)

Electrons carries ----------------- charge

A positive   c no   d both a & b

B negative 

In 1st shell number of electrons---------------

B 4   C  6   D 8

A 2

Atomic number of Helium is-------------

A  1  C  3   D  4

B 2



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