2. Why should a magnesium ribbon be cleaned before burning in air ?

Select the correct answer. which statement is true about a polarized object? o a. it gains electrons and becomes negatively charged. ob. it gains protons and becomes positively charged. oc. the number of positive and negative charges can be the same. od. it has to be a metal. o e. there is no change in the distribution of the charge in the object. reset next what

How do scientists think that gravity affected the formation of our solar system?

How have the greenhouse gasses increased from the year 2000 to 2018