EXERCISE 1.1

1. Which of following substance are elements, compounds, and mixture :

a. Ammonia
b. air
c. Chlorine
d. methane
e. Radium
f. sea water
g. Silicon

2. What is elements that maked use in things maker follow:
a. gold bracelet
b. advertisement lamp
c. drink can
d. air ballon
e. battery
f. wound medicine


3. Write the symbols, atomic number, mass number, the amount of proton-netron- electron, and depict nucleus, of the following elements :
a. Hydrogen
b. Mangaan
c. Chlorine
d. Mercury
e. Aluminium
f. Crypton

4. Explain the differences between compounds and mixture !(3 kinds)


5. Name the elements of the following compounds and mention the number of atoms in each molecule :
a. Mg(OH)2
b. CH3COOH
c. KMnO4
d. 2 H2SO4

6. a. Write and explain procedure that used to Purifying water.
b. You have to shake syrupe medicines before dringking. What is the aim of shaking? Explain!

7. Look at periodic table! Mention elements that present in :
a.noble gas group
b.alkali group