Revision work form Chapter 1, 2 and 3 Chemistry G-7

 Revision work Chapter 1, 2 and 3 Chemistry G-7

True and False.

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

Chose 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

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

d 5 in 5 0 in B

7.------------------has definite shape and volume 

A Gas   b Liquid   d All of above

C   Solid

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

B  H₂      c  H₂O            D  none of them

A He

9. Cl is the symbol of

A   Fluorine          b    Neon           c  Aluminium

D  none of the above

10. In ammonia number of Nitrogen is

B  2   C 3      d  4

A  1

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

A both  c  H₂O            D  none of them

B  H₂     

12. Formula of CH₄ is

A   A   B B    C C   D D

13. Is an example of 

B  unbalance equation   c Both of them    d   none of them

A balance equation

14. State symbol of gas is  

A (s)    B   (l)   D All of the above

C (g)

15. In this diagram -------------- color show nucleus 

A   blue c green   d yellow

b Red

16. Electrons carries ----------------- charge 

A positive   c no   d both a & b

B negative

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

B 4   C  6   D 8

A 2

18. Is an example of ---------------------

A Helium   B sodium c  Hydrogen

D Carbon

19. Atomic number of Helium is-------------

A  1  C  3   D  4

B 2

20. Atomic mass of this element is  

A   12    B   18      C 20    

D 24