You reacted 0.24 g of Mg with excess HCI, expecting to get 0.020 g of H2 gas. However, you only collected 0.010 g in the
graduated cylinder. What is the percent yield of the reaction?

it's all four options.

qualitative observation deals with data that can be observed with our senses: sight, smell, touch, taste, and hearing. they do not involve measurements or numbers. for instance, colors, shapes, and textures of objects are all qualitative observations.

if the temperature drops and becomes cool

then the atmosphere can be freezing as the water vapor in the air is at maximum (100%) and can be severely cold

also can be snowing lightly as the moisture in the air will start to solidify

and btw this is not chemistry but