Explanation

Hydrogen has an atomic weight of 1.00794u and accounts for 75% of the universe,

Thus making it the lightest and most abundant element in the universe.

Explanation

Answer:

C

Benzene is an organic compound.

 molecular formula C3H3.

A benzene molecule is composed of six carbon atoms connected to a planar ring, each with a hydrogen atom.

Benzene is classified as a hydrocarbon because it contains only carbon and hydrogen atoms.

Empirical  Formula: C6H6

Explanation

As this diagram shows, pH ranges from 0 to 14, with 7 being neutral.

pH less than 7 are acidic.

pH greater than 7 are alkaline.

Explanation

When nuclear energy is intended to be harnessed for the generation of electricity, potentially

destructive neutrons released in a nuclear reactor are absorbed by  Cubical blocks of steel Long rods of CD and  A pile of blocks made of graphite

Explanation

Water conservation is the practice of using water efficiently to reduce waste and preserve this precious resource.

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Explanation

Sedimentary rocks are formed from pre-existing rocks

Or pieces of once-living organisms. 

Explanation

6 Bio-Elements constituent 99% of the total human body

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6 Bio=Element are:

• Hydrogen
• Oxygen
• Carbon
• Nitrogen
• Calcium
• Phosphorus

Explanation

The density of ice is 0.9168 g/cm 3.

The density of water is 1 g/cm 3

Explanation

Copper, silver and gold are the three metals that are used for making coins and are called coinage metals

Explanation

A gemstone is used to make jewelry or other adornments.