4.01. Metals
and the periodic Table
Question:
Q-01. You are given a sample of an element. Write
down three clues that would tell you it was a metal?
A-01. Three clues are given below
1. The sample is a good conductor of heat & electricity.
2. The sample is hard & malleable.
3. The sample reacts with non-metal to form compound.
Q-02. Metals tend to be solid at room
temperature. Name one metal that is not.
A-02. Mercury
Q-03. Think of one way in which gold
behaves:
a. like iron b. differently from iron
A-03. a. gold can conduct heat & electricity
like iron
b. gold is not affected by air & water but
iron does.
Q-04. Look at the metals in the periodic
table.
a. Pick out the one you have seen in real
life, and write down their symbols.
b. Pick out three you think are named
after: 1. places 2. People
A-05. a. Iron, Symbol- Fe
b. named after places- Francium, Americium
Named after people- mendelevium
4.03 Group 1:
the alkali metals
Question
Q-01. Name the group 1 elements and give
their symbols
A-01.
Name of the group 1 elements with their symbol are given below
Lithium- Li
Sodium- Na
Potassium- K
Rubidium- Rb
Cesium- Cs
Francium- Fr
Q-02. What is the family name for the
group elements? Why are they called that?
A-02. The family name is alkali metal for
the group 1 elements.
Because alkali metals reacts vigorously
with water and hydroxide ion is formed which is responsible to change the pH of
the solution.
Q-03. Which best describes the group 1
metal:
a. soft or hard
b. high density or low density
c. high melting point or low melting
point
d. reactive or unreactive , with water?
A-03. Group 1 metals have following
properties:
a. soft
b. low density
c. low melting point than any other metal
d. too reactive with water
Q-04. a. write a word equation for the
reaction of lithium with water.
b. The pH of the water changes. Why?
A-04. a. the word equation is
Lithium + water------> lithium hydroxide+ Hydrogen
b. pH of the water changes due to
the alkaline hydroxide ion.
Q-05. a.
What forms when potassium reacts with chlorine?
b. What color is this compound?
c. What will you see when you
dissolve it in water?
d. Do you think the solution will
conduct electricity? Give a reason for your answer.
A-05. a.
potassium chloride form when potassium reacts with chlorine.
b. the color of the potassium
chloride is white.
c. potassium chloride gives a colorless
solutions when it dissolved in water.
d. yes. The solution will conduct
electricity.
Potassium
chloride is made of potassium ion (k+) and chloride ion (Cl-). The solution of potassium chloride contains ion
which is responsible to conduct electricity.
