GROUP 1: ALKALI METAL

GROUP 1: ALKALI METAL

12.2

ONLY lithium, sodium, and potassium ae safe to keep in school lab

PROPERTIES OF GROUP 1

1. PHYSICAL : They can be observed without changing the identity of the substances; see, smell, feel, look

2. CHEMICAL : They can only be observed by changing the identity of substances

PHYSICAL PROPERTIES

• colour

• shapes

• siZe

• density

• amount volume

GROUP 1 PHYSICAL PROPERTIES

• good conductors of heat & electricity

• soft

• lighter = low density=float on water

• low melting points

• low boiling points

• *the pattern of above properties increases going down the group

CHEMICAL PROPERTIES

• falammability

• rusting

• burning

• corrosion

• reactivity

#1 CHEMICAL PROPERTIES:

REACTION WITH H₂O

React vigorously with water. Hydrogen bubbles off, leaving solutions of their hydroxides which are alkali

What you can see?

How can you represent the chemical reaction?

#2 CHEMICAL PROPERTIES:

REACTION WITH Cl₂

Plunge into flames and burn brightly

#3 CHEMICAL PROPERTIES:

REACTION WITH O₂

Burns fiercely to form oxides, dissolves in water to give alkaline solution

Why they react in similar way and giving similar patterns?

clue: valency (outer-shell)

drawing time!!

Multiple Choice

What is another name for Group 1 elements?

• metals

• alkali metals

Multiple Choice

Which best describes group 1 metal?

• soft

• hard

Multiple Choice

Which of the following is not a group 1 metal?

• Li

• Mg

• K

• Na

Multiple Choice

Which best describes group 1 metal?

• unreactive

• reactive

Multiple Choice

Which of the following is an exampl of physical prperties?

• soft

• very reactive

Multiple Select

Which of the following is not a physical properties?

• density

• fizzes

• density

Multiple Choice

Which element in group 1 is the lightest metal?

• Li

• Na

• K

• Rb

Multiple Choice

lithium hydroxide is formed when it reacted with?

• water

• chlorine

• oxygen

Multiple Choice

lithium chloride is form when it reacts with?

• water

• chlorine

• oxygen

Multiple Choice

lithium oxide is formed when it reacts with?

• oxygen

• carbon dioxide

• water