Question

When Amanda poured some of the liquid in a test tube, she noticed that the edges of the water curved upward, which is an example of __________
.
When Pol filled another test tube to the top, the liquid formed a low dome, which is evidence of ___________
.
When Amanda added table salt to the first test tube and shook it, she noted that the liquid had dissolved the __________
.
All of these observations indicated the presence of _______
bonds.
Pol determined that the pH of the sample is 7, which shows the sample is ________
.
Based on all of the evidence Amanda and Pol gathered, the unknown liquid is_______
.
WORD BANK:
acid
adhesion
base
cohesion
covalent
hydrogen
ionic
neutral
solute
solvent
vinegar
water

Answer 1

Answer:

adhesion

cohesion

solute

hydrogen

neutral

water

Explanation:

Water molecules adhere (adhesion) to unlike surfaces  due to the presence of hydrogen bonds between the molecules. The capacity to from adhesion with unlike molecules is what makes ionic compounds (solutes) to be soluble in water. The adhesive force makes water to curve upward in a test tube. Pure water has a neutral pH of 7.

Some liquid molecules like mercury molecules have strong cohesive force holding the molecules together and therefore will not stick to surfaces of unlike molecules. That is why such molecules will form a low dome when poured into a test tube.

Answer 2

When Amanda poured some of the liquid in a test tube, she noticed that the edges if the water curved upward, which is an illustration of adhesion.  

When Pol filled another test tube to the top, the liquid formed a low dome, which is a proof of cohesion.  

When Amanda added table salt to the first test tube and shook it, she noticed that the liquid had dissolved the solute.  

All of these observations are suggesting the existence of covalent bonds.  

Pol determined that the pH of the sample is 7 that indicates that the sample is neutral.  

Based on all the proof gathered by Pol and Amanda, the unknown liquid is water.