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1)Always write out the reaction first;

2NaCl+CaCo3-->Na2Co3+CaCl2  

2)Now underneath calculate the Relative Formula Mass using a periodic table for each of the compounds....

The alveoli are sac like structures which have a large surface area to volume ratio allowing for fast diffusion of oxygen into the blood (Fick's law). This large SA:V ratio is generated because the alv...

Firstly the heart is myogenic, thereofore is controlled by the autonomic nervous system hence doesnt require conscious control. The pumping mechanism of the heart begins with stimulation of the Sinoatrial...

To find the gradient of a straight line we can use the change in the X and Y directions.

The gradient (Slope) of a straight line is defined as :

​Grad = (Change in Y) / (Cha...

Reactivity increases down the group. The number of electron shells increases down the group. Therefore the outer electron is further away from the nucleus. Consequently, the attraction between the outer e...