Group 1 - The Alkali Metals | The Periodic Table

The video tutorial explores alkali metals in group 1 of the periodic table, focusing on their properties, reactivity trends, and practical experiments with lithium, sodium, and potassium. It highlights how these metals react with water to form alkaline solutions, with increasing softness and reactivity down the group. The tutorial also discusses the density, melting, and boiling point trends of alkali metals.

Which of the following elements is not an alkali metal?

• Lithium

• Sodium

• Calcium

• Potassium

What happens when lithium is placed in water?

• It sinks and remains unchanged.

• It changes color to red.

• It floats, fizzes, and slowly disappears.

• It explodes immediately.

What color does the universal indicator turn when sodium reacts with water?

• Red or orange

• Green or yellow

• Blue or purple

• No color change

What unique observation is made when potassium reacts with water?

• It burns with a lilac flame.

• It does not react.

• It produces a green flame.

• It sinks to the bottom.

As you move down the group of alkali metals, what trend is observed in their melting points?

• Melting points remain constant.

• Melting points decrease.

• Melting points increase.

• Melting points fluctuate randomly.