Answer:
A. Iodine (falls in the same group as chlorine)
Explanation:
Answer:
Condenses at 27.25K.
Freezes at 24.65K.
Explanation:
In order to solve this above question, there is is need to make use of the following equation. The main idea here is to convert degree celsius to Kelvin. Hence,
0°C + 273.15 = 273.15K---------------------(1).
Therefore, we will make use of the above equation (1) and slot in the values for at degree celsius at which it condenses and at degree celsius at which it freezes.
So, we have at temperature at which it condenses:
-245.9°C + 273.15 = 27.25K.
Also, we have at temperature at which it freezes.
-248.5°C + 273.15 = 24.65K.
Answer: -
Oxidation, Oxygen
Explanation: -
Burning of magnesium gives us magnesium oxide.
The chemical symbol of magnesium is Mg.
The chemical symbol of magnesium oxide is MgO.
So, the balanced chemical equation is
2Mg + O2 – 2 MgO.
We see that the element added is O Oxygen.
So, the reaction is oxidation.
In oxidation always, oxygen is the common element involved in all chemical reactions of this kind.
We will use Boyle's law. P = 1/V which simply means pressure is inversely proportion to volume at a constant temperature. We will assume temperature here does not change. Since we have two pressure/volume points, we use this version of Boyle's law.
P1 V1 = P2 V2
P is pressure and V is volume
In our case:
P1 is 736, V1 is 4.2 while V2 is 9.0 but P2 is unknown. This is what we need to find out.
736 * 4.2 = P2 * 9.0
P2 = 736 * 4.2 / 9.0
P2 = 3091.2 / 9.0
P2 = 343.5
Therefore the new pressure 343 mm/hg
Here we see that the increase in volume causes decrease in pressure in total agreement with Boyle's law.
