Consider the reaction: Mg + 2 HCI --> H2 + MgCl2 The rate of this reaction increases when more magnesium is added. This change is caused by the
addition of a catalyst
change in the nature of the reactants
increase in the concentration of the reactants
increase in the surface area of the reactants

relative humidity is a measure of the amount of moisture in the air relative to the total amount of moisture the air can hold.

so d

why is arctic sea ice important? arctic sea ice keeps the polar regions cool and moderate global climate. sea ice has a bright surface; 80 percent of the sunlight that strikes it is reflected back into space. as sea ice melts in the summer, it exposes the dark ocean surface.

the electrical  conductivity  of asolution  of an electrolyte is measured by determining the resistance of thesolution  between two flat or cylindrical electrodes separated by a fixed distance.

the answer to this question is 3.