Explanation

Atom bomb is based on the principle of nuclear fission.

 uncontrolled nuclear fission is the principle for an atom bomb.

Explanation

Ball bearing reduces friction by using smooth balls lubricated with oil or grease

that freely roll between a smooth inner and outer surface.

SH5-8-2023

Explanation

Red phosphorus is the form of phosphorus used in safety matches.

It's found on the striking surface of the matchbox, not in the match head itself.

This design separation prevents the match from spontaneously igniting. 

Explanation

In Karst topography, both gypsum and dolomite are soluble.

They can form karst landscapes through dissolution.

This process is similar to limestone, though it occurs at varying rates.

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

Metals are opaque, meaning they do not allow light to pass through.

They are malleable (can be hammered into thin sheets) and lustrous (shiny in appearance).

Explanation

The hardest substance in the world is diamond.

Its hardness is due to the strong covalent bonding between its carbon atoms.

This making it the most resistant to scratching.

Category: Native minerals

Cleavage: 111 (perfect in four directions)

Crystal class: Hexoctahedral (m3m); H-M symbol: (4/m 3 2/m)

Crystal habit: Octahedral

Crystal system: Cubic

Dana classification: 1.3.6.1

Density: 3.5–3.53 g/cm3 3500–3530 kg/m3

Explanation

Bromine is one of the only two elements (along with mercury) that are liquid at room temperature.

The others listed are solid or gas under normal conditions.

Explanation

The element of an electric stove made nicrome.

Nichrome 80/20 is an ideal material, because it has relatively high resistance and forms an adherent layer of chromium oxide when it is heated for the first time.

Explanation

 Copper was first used by man over 10,000 years ago

The period following the use of copper is sometimes referred to as the Copper Age or Chalcolithic Age.