Answer the questions with fill in the blank.

Answer :

(7) When phenolphthalein is added to the solution of pH 10 (basic) then the color will be pink.

(8) When the litmus is blue in a solution that means the solution is basic in nature.

(9) The range of methyl orange is 3.2 - 4.4 (red-yellow).

The range of bromothymol blue is 6.0 - 7.6 (yellow-blue).

Explanation :

Part 7:

As the phenolphthalein is a synthetic indicator which is used to detect color change when an acid and a base is added to it. The neutral color of phenolphthalein is colorless.

Phenolphthalein indicator is colorless in acidic solution.

Phenolphthalein indicator gives pink color in basic solution.

When phenolphthalein is added to the solution of pH 10 (basic) then the color will be pink.

Part 8:

As the most common indicator used in the laboratory for testing acids and bases is litmus paper.

Litmus paper is of two types which are blue litmus and red litmus.

As the solution is acidic in nature then the litmus paper turns blue to red and as the solution is basic in nature then the litmus paper turns red to blue.

According to the question, when the litmus is blue in a solution that means the solution is basic in nature.

Part 9:

The range of methyl orange is 3.2 - 4.4 (red-yellow).

The range of bromothymol blue is 6.0 - 7.6 (yellow-blue).

mechanics (greek   is that area of science concerned with the behaviour of physical bodies when subjected to forces or displacements, and the subsequent effects of the bodies on their environment. the scientific discipline has its origins in ancient greece with the writings of aristotle and archimedes[1][2][3] (see history of classical mechanics and timeline of classical mechanics). during the early modern period, scientists such as galileo, kepler, and newton laid the foundation for what is now known as classical mechanics. it is a branch of classical physics that deals with particles that are either at rest or are moving with velocities significantly less than the speed of light. it can also be defined as a branch of science which deals with the motion of and forces on objects. the field is yet less widely understood in terms of quantum theory.

explanation:

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.