Explanation:
the volume of anything is m³
so anywhere you see volume....
the unit recognised is m³
B. 1. Think of pure grade alcohol is 100% alcohol
Answer: 7.622g of sulphuric acid
Explanation:
3H2SO4 + 2Al -> Al2(SO4)3 + 3H2
3 moles of H2SO4 needs 2 moles of Al
(3 x 98)g of H2SO4 needs (2 x 27)g of Al
294g of H2SO4 needs 54g of Al
29400mg of H2SO4 needs 5400mg of Al
1mg of Al = 294/54 = 5.44mg of Al
140.11mg of Al = 140.11 x 5.44
= 762.2mg = 762.2/100 = 7.622gof sulphuric acid
Argon is a suitable choice for light bulbs because it is inert. Compared to a reactive gas like oxygen, the metal filimant would burn up in a reactive environment, which is why a noble gas is used.
The nuclei of atoms become unstable when the repelling forces of the protons cannot be balanced by the number of neutrons in the nucleus. It then re-arranges itself randomly to a more stable configuration by emitting any of a series of particles. During radioactive decay, an atom does not collapse.
Since an atom is mostly empty space - that is it’s nucleus is relatively distant from the electron shells so, in the presence of extreme forces such as gravity inthe collapse of a large star, the inward pressures on the atom overcome the natural balance of the atomic structure and the ‘empty space’ disappears as nuclei are mashed together by the intense pressures and a neutron star is formed. Under even more external pressure, even the neutron star can collapse to form a black hole.
