What is a good sentence and picture for reference point in scientific terms?

How many atoms of nitrogen are in the chemical formula ni(w on

Ajoint produces movement when its angle decreases. which type of movement is it?

When a lead acid car battery is recharged by the alternator, it acts essentially as an electrolytic cell in which solid lead(ii) sulfate is reduced to lead at the cathode and oxidized to solid lead(ii) oxide at the anode. suppose a current of is fed into a car battery for seconds. calculate the mass of lead deposited on the cathode of the battery.