Describe the experiment 'to cut and bend the glass tube into
i) right angle
ii) obtuse angle
iii) acute angles
iv) capillary tube
v) jet tube

Ineed ! i have no clue how to do this problem.

What was bohr’s contribution to the planetary model

Which change will decrease the number of effective collisions during a chemical reaction? a. adding a catalyst b. increasing the surface area c. decreasing the temperature d. increasing the reactant concentrations e. increasing the volume of the reactants