Explanation

 Cyclohexane is an alicyclic compound. 

Alicyclic compounds are cyclic (meaning they form a ring) and saturated (meaning they only have single bonds between carbon atoms).

Cyclohexane fits this description as it is a six-membered ring with only single bonds connecting the carbon atoms. 

Explanation

The covalent bond between glucose and fructose, forming sucrose, is called a glycosidic bond, specifically a 1-2 glycosidic linkage.

This bond is formed through a dehydration reaction where a water molecule is removed when the two monosaccharides join. 

Explanation

When water vapour in the air condenses and accumulates around a dust particle near the ground, fog is formed.

Cloud of small water droplets near ground level that is dense enough to reduce horizontal visibility to less than about 3,000 ft (1,000 m).

Fog may also refer to clouds of smoke particles (smog), ice particles, or mixtures of these components.

Explanation

To arrange the groups in increasing order of species richness (i.e., from fewest to most species), let's look at general estimates of known species:

• Mammals – ~6,400 species
• Reptiles – ~11,000 species
• Fishes – ~34,000 species
• Insects – Over 1 million described species (possibly several million undiscovered)

Explanation

Ohm's Law is V = IR,

where V = voltage,

I = current,

and R = resistance.

Explanation

Ultrasound is sound with frequencies greater than 20 kilohertz.

This frequency is the approximate upper audible limit of human hearing in healthy young adults

while 

The first article on the history of ultrasound was written in 1948

Explanation

 Propanoyl chloride is an acid chloride, which is a type of acid halide.

Acid halides are characterized by a carbonyl group (C=O) bonded to a halogen atom (like chlorine).

The general formula for an acid halide is RCO-X, where R is an alkyl group and X is a halogen. 

Explanation

Epinephrine and norepinephrine are secreted by the adrenal medulla and play a role in the fight-or-flight response,

Whereas the hypothalamus secretes dopamine and inhibits the release of certain anterior pituitary hormones.

Explanation

Aerophobia is an extreme fear of flying.

People with aerophobia might feel intense anxiety before or during a flight

while

Anthophobia is the fear of  floral

Febriphobia is the fear of fever.

Laliophobia is a fear of speaking

Nyctophobia is the fear of  Darkness.

Explanation

In Carbon dioxide, carbon and oxygen will always combine in a ratio of 3:8 by mass.