All of them are properties of compounds except III.
for I, compounds are chemically combined together, so to separate them, we must use chemical methods like electrolysis or applying heat. These requires large amount of energy.
For II, they're always fixed. For example, in water (H2O), the ratio of hydrogen and oxygen is always 1:8 in mass. If there's some extra added, the substance becomes mixture instead of compounds.
For IV, after you chemically combined elements or compounds together, their properties are completely different. For example, iron can be attracted to magnets, but iron II sulphide does not.
Answer:
D
Explanation:
In the problem above it is
q = mass x heat fusion
q = 10 g x 334 J/g = 3340 J. Since the ice is absorbing heat it is + 334 J.
To determine the pOH Of solution we can use the pka value for the ionization constant of water at 25 degrees Celsius to solve this the relationship would be as follows.
PH + POH = 14
3.9 + x = 14
POH = 14 - 3.9 = 11 - 0.9 = 10.1
The POH would be 10.1.
1 mole of glucose : 6 moles of oxygen
First calculate the number of moles of oxygen in 10 g:
1 mole of glucose reacts with 6 moles of oxygen
x moles of glucose reacts with 0.3125 moles of oxygen
Now calculate the mass of 5/96 moles of glucose.
The maximum mass of glucose that can be burned in 10 g of oxygen is 9.375 g.
