Why water in considered as compound?
2 answers:
Answer with Explanation:
Water is a<em> compound </em>because it consists of<u> two types of atoms</u> <em>(Hydrogen and Oxygen)</em> that are chemically bonded. An<em> "element"</em> only consists of one type of atom, therefore, water is not an element but a compound. Its chemical formula is: . This means that water consists of <u> 2 atoms of Hydrogen that are bonded to an atom of Oxygen.</u> Take note that a compound is <em>different compared to the elements that it is made of</em>. For example, water is essentially liquid in its form but it is different from the atoms of Hydrogen and Oxygen, which are gas in form.
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Answer:
6 half-lives are required for the concentration of reactant to decrease to 1.56% of its original value.
Explanation:
Using integrated rate law for first order kinetics as:
Where,
is the concentration at time t
is the initial concentration
Given:
Concentration is decreased to 1.56 % which means that 0.0156 of is decomposed. So,
= 0.0156
Thus,
kt = 4.1604
The expression for the half life is:-
Half life = 15.0 hours
Where, k is rate constant
So,
<u>6 half-lives are required for the concentration of reactant to decrease to 1.56% of its original value.</u>