Grade 7 First Final Term Revision 2022 Chemistry

 

Grade 7   Chemistry                                                                    

Question 1               

 

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

Question 2                 

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

Question 3               

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

A 10 in A 0 in B       b 0 in A 10 in B      c   8 in A 2 in B

d 5 in A 5 in B

------------------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

----------------------- is an example of element.

A both  c  H₂O            D  none of them

B  H₂     

Formula of CH₄ is

   B B    C C   D D

A   A

Is an example of

B  unbalance equation   c Both of them    d   none of them

A balance equation

State symbol of gas is 

A (s)    B   (l)   D All of the above

C (g)

In this diagram -------------- color show nucleus

A   blue c green   d yellow

b Red

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

A positive   c no   d both a & b

B negative

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

B 4   C  6   D 8

A 2

Is an example of ---------------------

A Helium   B sodium c  Hydrogen

D Carbon

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

A  1  C  3   D  4

B 2

Atomic mass of this element is 

A   12    B   18      C 20    

D 24