Answer:
No
Explanation:
Mass never changes unless you actually cut off or add to the object.
<u>Weight</u> changes based on gravity, but mass doesn't
So half life is the time taken for a sample to decay to half its original mass, its a constant and applies to any original mass, it could be 5g or 1kg, it will take the same amount of time for the original mass to half. In this case the half life is 3 days.
After 3 days the sample will be at half its original mass, now 50g.
Now we can treat the 50g as if its a new sample. After another 3 days (6 days in total) there will be half of 50g left, = 25g.
Answer:
See below in bold.
Explanation:
a) Yes because it is an ionic compound. Forms ions in water solution.
b) This is an alcohol with covalent bonds it does not ionise in water - no.
c) Yes this forms ions in water solution.
d) This is a sugar and does not ionise so No.
Answer:
12.55 → pH
Explanation:
pH = - log [H⁺]
pH = 14 - pOH
pOH = - log [OH⁻]
pOH = - log 0.035 = 1.45
14 - 1.45 = 12.55 → pH
Remember that [OH⁻] . [H⁺] = 1×10⁻¹⁴ M
Energy is absorbed to break bonds, and released when bonds are formed.
