Answer:
electron loses energy (falls back) from a higher energy state to a lower one emitting photons at different frequencies for different energy transitions.
Answer:
- 7 carbon atoms.
- 14 hydrogen atoms.
- 1 oxygen atom.
Explanation:
Hello,
In this case, for the given compound, heptanone, whose chemical formula is:
We can write the molecular formula showing the present atoms of each element:
In such a way we have:
- 7 carbon atoms.
- 14 hydrogen atoms.
- 1 oxygen atom.
Best regards.
Answer:
Explanation:
Magnetic materials are always made of metal, but not all metals are magnetic. Iron is magnetic, so any metal with iron in it will be attracted to a magnet. Steel contains iron, so a steel paperclip will be attracted to a magnet too. Most other metals, for example aluminium, copper and gold, are NOT magnetic.
Given:
Volume of HBr = 50 ml
Concentration of HBr = 0.15 m
Concentration of KOH = 0.25 m
Volume of KOH = 20 ml
Balanced Chemical Equation:
HBr + KOH ===> KBr + H2O
pH = log ([acid]/[base]) + pKa
Ka (HBr) = 1.0 x 10^<span>9
pH = log ([0.15*0.05L]/[0.25*0.020]) - log (1x10^9)
pH = 9.176</span><span />
If x is H+ then <span>x/0.15 = 0.03 and x = 0.0045 M </span><span>and
</span>
<span>Ka = x^2/(0.15 - x) = 0.0045^2/(0.15 - 0.0045) = 1.39 x 10^-4</span>