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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