Answer : Hydrogen fuel cells are considered to be better than fossil fuels because of many reasons, some of them are mentioned below;
a) It is a clean fuel it does not causes any pollution to the atmosphere.
b) It more efficient than many other available fuel cells.
c) Preparation of hydrogen fuel cell relies on the free or compounded state availability hydrogen in nature, which in plenty.
d) They do not make any noise while it is being used. Hence these are considered to be quiet fuel cell.
e) They can be used for longer hours as compared to other fuel cells.
Answer:
Cacl2
Explanation:
Cacl2 conducts electricity in its molten state and also because its an ionic compound.
In order to convert mm³ to m³, we use the conversion factor of 1m = 1000 mm. Also, the conversion factor of mm³ to cm³, we use the factor of 1cm = 10 mm.
= (0.45 mm³) x (1 m/ 1000 mm)³ = 4.5 x 10^-10 m³
= (0.45 mm³) x (1 cm/10 mm)³ = 4.5 x 10^-4 cm³
Thus, the answer is letter B.
Atoms and element do relate with each other.
<h3><u>Explanation:</u></h3>
Atoms are defined as the smallest particle of an element which cannot be divided further keeping its physical and chemical properties intact, and they take part in a chemical reaction.
Elements are defined as the substances that are components of matter and cannot be further divided into simpler substances.
AMU or the Atomic mass unit is defined as a unit that is used to express atomic mass and is equal to mass of a hydrogen ion.
Elements are actually formed of atoms that are present in nature and atoms do form elements and even compounds. So they are inter related with each other.
The percentage of offspring with a black coat would be roughly 50%