The answer is ( The concentrations of the products and reactants do not change.)
(a) For the compound XF₂, X must be a metal. As fluorine is monovalent and there are two fluorine atoms, so the valency of X must be two.
Therefore, X belongs to group 2.
A metallic compound is a compound that contains one or more metal elements bonded to another element.
The elements are bonded with the help of metallic bonds.
Monovalent compounds are compounds which consist of an atom which has only a single covalent bond.
The covalent bond is defined as an interatomic linkage formed by sharing the electronic pair between two atoms.
Valency is the combining power of an element. It helps with bond formation.
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Energy transfer is not an efficient process.
Explanation:
There is less amount of energy in the top of the energy pyramid than at the bottom because energy transfer is not an efficient process. During the process of energy transferring, some amount is lost and some are converted to other forms of energy.
- The sun is the ultimate source of energy for all life in the solar system.
- When autotrophs takes this energy, they produce food from it.
- They use light energy from the sun to produce chemical energy in food.
- Even this conversion process waste precious amount of energy.
- As one goes up the pyramid, more energy is lost during the process of converting from one form to another.
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The atomic mass of
an element is calculated using its masses and the ratios of its
naturally occurring isotopes. The answer is number 3. The rest of the choices do not answer the
question above.
