six commonly recognised metalloids are boron, silicon, germanium, arsenic, antimony, and tellurium. Five elements are less frequently so classified: carbon, aluminium, selenium, polonium, and astatine.
Answer:
679.32 kJ
Explanation:
Heat required = number of moles * latent heat of fusion of water
So since we are given the mass of water and not the number of moles our first step is to calculate the number of moles of water available,
![n = \frac{mass}{molar mass} = \frac{2000g}{18.01528g/mol}= 111.0 mol](https://tex.z-dn.net/?f=n%20%3D%20%5Cfrac%7Bmass%7D%7Bmolar%20mass%7D%20%3D%20%5Cfrac%7B2000g%7D%7B18.01528g%2Fmol%7D%3D%20111.0%20mol)
heat required = 111.0 mol * 6.12 kJ/mol
= 679.32 kJ
Answer:
Increases
Explanation:
When a catalyst is added to hydrogen peroxide,the rate of decomposition Increases.
In living organisms, hydrogen peroxide is gotten through metabolism and it has to be broken down. This is because it could become toxic if it gets to be concentrated.
We can increase the rate of decomposition reaction through the addition of a catalyst. This breaks it down into hydrogen and water
Answer:
.
Explanation:
Based on the electron configuration of this ion, count the number of electrons in this ion in total:
.
Each electron has a charge of
.
Atoms are neutral and have
charge. However, when an atom gains one extra electron, it becomes an ion with a charge of
. Likewise, when that ion gains another electron, the charge on this ion would become
.
The ion in this question has a charge of
. In other words, this ion is formed after its corresponding atom gains two extra electrons. This ion has
electrons in total. Therefore, the atom would have initially contained
electrons. The atomic number of this atom would be
.
Refer to a modern copy of the periodic table. The element with an atomic number of
is sulphur with atomic symbol
. To denote the ion, place the charge written backwards ("
" for a charge of
) as the superscript of the atomic symbol:
.
There are 9 different amino acids that you need to include to your diet. They are called assential Amino acids and they cannot be synthesized by the organism