Chemistry 9 Chapter 1 Practice Test 2

Hair contain a special class of proteins called keratins, which are present in nails and wool. Proteins contain chains of C-atoms.

Photosynthesis produces glucose and oxygen from carbon dioxide and water in presence of chlorophyll and sunlight.

Haber’s process converts large quantities of hydrogen and nitrogen into ammonia (NH₃ ).

Sulphuric acid (H₂ SO₄) is extremely corrosive to skin.

Calorimeter is a device that measures the amount of heat, a substance absorbs on heating or emits on cooling.

Some examples of complete protein food are meat, milk, and eggs.

A chemist performed an experiment to check the percentage purity of a sample of glucose (C₆ H₁₂ O₆).

Acetylene is the simplest hydrocarbon that contains a carbon-carbon triple bond. Hydrocarbons are the compounds of carbon and hydrogen.

Gases can be compressed by applying pressure.

α-particles (He⁺⁺) when bombard on nitrogen atom, a proton is emitted.

Ammonia is a colourless gas with a pungent irritating odour. It is highly soluble in water.

Element radium decays by emitting α-particles and is converted into another element radon.

White lead is a pigment used by artists for centuries, the metal Pb in the compound is extracted from its ore, galena (PbS).

An analyst determines that NO₂ is responsible for acid rain.

Chlorofluorocarbon compounds are responsible for the depletion of ozone layer.

Plantation helps in overcoming the greenhouse effect.