Explanation

The density of water depends on temperature and salt content. Density is measured as mass (g) per unit  volume (cc). Water has the highest density at 3.98 ° C and the lowest density at 0 ° C (freezing point).

Explanation

The electricity we use in our homes is called Alternating Current/ Mains supply.

Alternating current is used in most electricity distribution systems for several reasons, but the most important one is the ease with which it can be transformed from one voltage to another

Explanation

Chlorophyll is a compound that is called a Chelate. 

Photosynthesis depends on the presence of chlorophyll for the absorption of light.

There are about five closely related chlorophylls:

1. chlorophyll a
2. chlorophyll b
3. chlorophyll c
4. chlorophyll d
5. chlorophyll e
6. chlorophyll f

Explanation

• Mercury is the only stable elemental metal that is liquid at standard room temperature
• Symbol and Number: Mercury has the chemical symbol Hg and atomic number 80.
• Freezing Point: It melts at -38.8°C (-37.9°F)

Explanation

 Osmium is a chemical element with the symbol Os and atomic number 76.

Explanation

Salinity in seawater is defined as the total  weight of salt dissolved  in 1 kilogram of seawater.

Salinity is expressed in  g / kg and is often expressed in ppt (parts per 1000) or ‰ (permit).

Explanation

Compound: a substance that is made up of more than one type of atom bonded together.

Additional Information:

Explanation

Explanation

Metallic bonds are the force of attraction between positive metal ions and valence electrons that are constantly moving around them.

Metallic bonds occur among metal atoms.

Whereas ionic bonds join metals to non-metals,

metallic bonding joins a bulk of metal atoms.

A sheet of aluminum foil and a copper wire are both places where you can see metallic bonding in action.

ND-21-5-2023

Explanation

• Smelting is a metallurgical process used to extract metals from ores.
• The ore is heated to a high temperature.
• A reducing agent is often used to remove oxygen from the metal oxide.
• The metal is separated from the impurities (gangue).
• Example: Iron is extracted from iron ore by smelting in a blast furnace.