|Chemistry||A Level||£20 /hr|
The formula of the metal oxide is MO, which means there is only one oxygen atom bonded to the metal. The Mr of a compound is the sum of Ar of the elements that make up the compound. So, from this we can construct a equation.
Mr of MO = Ar of oxygen + Ar of metal
81 = 16 + Ar of metal
We can then rearrange the equation to give the Ar of the metal.
Ar of metal = 81 - 16
Ar of metal = 65
By looking at a periodic table we can see that the metal that has an Ar of 65 is Zinc.see more
The walker's body will do three things to help slow the decrease in core body temperature. The first is the walker will begin to shiver. Shivering is the spasming of muscles, the muscles as they work generate heat, through respiration, this heat helps to reduce the rate of temperature decrease.
Secondly the muscles at the root of the hairs on the arms and legs of the walker will contract, causing the hairs to stand on end. This is known as goosebumps. The hair will then trap a thin layer of insulating air, helping to slow the heat loss to the environment.
Thirdly the blood vessels in the extremities of the body, such as the hands and feet, will constrict. This is known as vasoconstriction, and this means that less blood is near the skin and so there is less heat loss to the environment.see more
The pi-bonds in benzene are delocalised over the entire ring, while in an alkene the pi-bonds are only delocalised over two carbon atoms. This means that benzene has a lower charge denisity than an alkene so benzene doesn't particularly polarise the bromine molecule. So no electrophilic addition between the bromine and benzene will take place.
The larger charge denisty of the alkene will mean that as the bromine molecule approaches the alkene it is polarised, the alkene can then donate its electrons to the positive bromide ion.see more