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MATTER - PROPERTIES AND TRANSFORMATION: Chemistry Of Elements - Alkali metals and alkaline earth metals
MATTER - PROPERTIES AND TRANSFORMATION: Chemistry Of Elements - Identification Of Ions
MATTER - PROPERTIES AND TRANSFORMATION: Chemistry Of Elements - Salts
MATTER - PROPERTIES AND TRANSFORMATION: Chemistry Of Elements - Transition metals
MATTER - PROPERTIES AND TRANSFORMATION: Chemistry of Elements - Nitrogen
MATTER - PROPERTIES AND TRANSFORMATION: Chemistry of Elements - Sulphur
MATTER - PROPERTIES AND TRANSFORMATION: Organic Chemistry - Hydrocarbons
MATTER - PROPERTIES AND TRANSFORMATION: Principles Of Chemistry - Formulae, Moles And Equations
MATTER - PROPERTIES AND TRANSFORMATION: Principles Of Chemistry - Gaseous State
MATTER: PROPERTIES AND TRANSFORMATION: Principles Of Chemistry - Solutions and acid-base titration
PRINCIPLES OF CHEMISTRY: Electrochemistry

What are the main causes of temporary hardness in water?

Dissolved iron compounds.

Dissolved calcium and magnesium sulphates.

Dissolved calcium and magnesium bicarbonates.

Dissolved sodium chloride.

When lithium metal burns in oxygen, what is the primary product formed?

Lithium hydroxide (LiOH).

Lithium oxide (Li₂O).

Lithium peroxide (Li₂O₂).

Lithium superoxide (LiO₂).

The compound gypsum, used in plaster and construction, is chemically:

Calcium hydroxide.

Calcium oxide.

Calcium carbonate.

Calcium sulphate.

Which of the following is true about the densities of Group 1 metals?

They are all less dense than water.

They are all denser than water.

Lithium is denser than water, but sodium and potassium are less dense.

Lithium, sodium, and potassium are all less dense than water.

How does adding washing soda (Na₂CO₃) soften hard water?

It reacts with chloride ions to form a soluble salt.

It precipitates the calcium and magnesium ions as insoluble carbonates.

It exchanges sodium ions for calcium and magnesium ions.

It neutralizes the acids in water.