Imagine you are working in a laboratory that makes tablets for relieving indigestion. the tablets work by reacting with water or acid in the stomach. carbon dioxide gas is produced as a result. you are asked to determine if taking the tablets with alcohol will affect the speed at which the tablets work.
describe how you will carry out your investigation. you can use any or all of the apparatus below. (you may include diagrams of your experimental set-up.)
• 3 (100 cm³) conical flasks
• 3 balloons
• 3 rubber bands
• 3 indigestion tablets
• water
• alcohol
• measuring cylinder
• stopwatch
• mass balance

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.

the answer is 1260

you spend 7 hours in school for 1 school day with 5 school days in 1 school week with 36 school weeks in a school year.

7*5*36= 1260 it's all about multiplying