Answer:
1. 
2. 
Explanation:
An ion is formed when an atom that is said to be neutral gains or losses electrons.
It is thought that a negative ion (anion) is produced as it gains electrons and a positive ion (cation) is formed when it loses an electron.
Atomic number is the total number of protons and electrons in a neutral atom.
From the information
Protons = 14
electron = 18
Net Charge = no of proton - no of electron
= 14 - 18 = -4
Mass number = 14 + 15 = 29
Thus, the chemical symbol =
For ion with 27 proton, 32 neutrons and 25 electrons
Net charge = 27 - 25 = +2
Mass number = 27 + 32 = 59
Thus, the chemical symbol =
A census is a survey of a complete population and not just a small sample.
You can hold a census of your entire school, your whole city, or the entire state.
A census has to include EVERYONE in the population you want to draw conclusions on. A sample would only include a small number of people from any group. The census must survey all of them.
Answer:
the first one
Explanation:
neutrons only have neutral charges and electrons are not heavier than protons
"No combustion", is the chemical description here.
Hope this helps!
Answer:To speed up the rate of hydrogen production
Explanation:
In the preparation of Hydrogen from the action of dilute acid on zinc metal, few drops of Copper(II)tetraoxosulphate(VI) solution is added to speed up the rate of production.
The hydrogen produced is shown in the equation below
Zn(s) + 2HCl(aq) --> ZnCl2(aq) + H2(g)
Thus, Copper(II)tetraoxosulphate(VI) solution, a catalyst is used to speed up hydrogen production.
