A student investigates how the concentration of an acid affects the speed of the reaction 0.5g mass of magnesium at 30 degrees

The student has a beaker, concentrated acid, water and the apparatus below:

P a balance; Q a clock; R a measuring cylinder; S a thermometer
Which pieces of apparatus does the student use?
A) P, Q and R
B) P, Q and S
C) Q, R and S
D) P, Q, R and S

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.

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.