3. Make an argument for placing hydrogen in the halogen group rather than the alkali metals. 4. Compare and contrast ionization
1 answer:
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The nuclear symbol of an element have three parts namely:
- the symbol of an element
- mass number of the element
- atomic number of the element
The general representation is as:
where X is the chemical symbol of the element, A is mass number of the element that is total number of neutrons and protons in the nucleus of an atom, and Z is atomic number of the element that is number of protons in the atom.
Element = Gallium, (given)
Number of neutrons = 40 (given)
Let the nuclear symbol be . So, we need to determine the values of "?" in the symbol.
Atomic number of Gallium, = 31
Since, atomic number = Number of protons.
So, number of protons of Gallium, = 31
Mass number = number of protons + number of neutrons
Substituting the values:
Mass number =
So, the nuclear symbol is .
Concentration "molarity" of H₂SO₄ in this solution:
5 × 10⁻³ mol / dm³.
<h3>Explanation</h3>What's the concentration of H⁺ ions in this solution?
,
where is in the unit mol / dm³.
.
What's the concentration "molarity" of H₂SO₄ in this solution?
Sulfuric acid H₂SO₄ is a strong acid. Note the subscript "2". Each mole of this acid dissolves in water to produce two moles of H⁺ ions. It takes only of H₂SO₄ to produce twice as much H⁺ ions.
As a result, the <em>molarity</em> of H₂SO₄ is 5 × 10⁻³ mol / dm³ or 0.005 M.
Answer:
It increases the reaction rate by lowering the activation energy for a reaction.
Please see the picture below in order to easier to understand.
Explanation:
However, note that there are positive and negative catalyst. The question above is just about the positive catalyst.
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Hope this answer can help you.
