Bohr changed the model of the atom by proposing that electrons travelled in circular orbits with specific energy levels.
Explanation:
12)
a) Sodium + oxygen = ?
When sodium reacts oxygen its forms sodium oxide as a product.
b) magnesium + fluorine = ?
When magnesium reacts with fluorine its forms magnesium fluoride as a product.
13)
a) 
Decomposition of mercury(II) oxide on heating gives out mercury and oxygen gas.
b)
The electrolytic decomposition of water gives out hydrogen gas amd oxygen gas.
Answer: What best describes the reaction is "A single replacement reaction takes place because zinc is more reactive than hydrogen."
0.005008 = 5.008 × 10^(-3)
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Answer:
pH = 1.76
Explanation:
The mixture of formate and formic acid produce a buffer. The pH of the buffer is obtained using H-H equation as follows:
pH = pKa + log [A-] / [HA]
<em>Where pH is the pH of the buffer:</em>
<em>pKa = -log Ka = 3.74</em>
<em>[A-] is molar concentration of conjugate base (Formate) = 0.015M</em>
<em>[HA] is molar concentration of weak acid (Formic acid) = 1.45M - 0.015M = 1.435M</em>
Replacing:
pH = 3.74 + log [0.015M] / [1.435M]
<h3>pH = 1.76</h3>
