imagine a drop of water hanging from your finger. how is this similar to the water staying together after the balloon is popped
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Final answer:
The concept of surface tension, enforced by cohesive forces between water molecules, explains why a water droplet hangs from your finger and why water stays together momentarily after a balloon is popped.
Explanation:
The similarity between a drop of water hanging from your finger and the water staying together after a balloon is popped is surface tension. Surface tension is a physical property of liquids which makes them act like they are covered with a stretched elastic sheet. This property is caused by the cohesive forces between liquid molecules.
When a water droplet hangs from your finger, the cohesive forces of the water molecules hold them together in a droplet shape due to surface tension. Similarly, when a water-filled balloon is popped, the water doesn't immediately disperse into a fine spray but rather holds together momentarily. This is also due to cohesive forces and surface tension. Each water molecule is pulled equally in every direction by its neighboring water molecules, resulting in a net force of zero and maintaining its shape momentarily even without the balloon.
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The equationrepresents Newton's Second Law of Motion.O A.) Force = Mass x AccelerationOB.) Mass = Force x AccelerationOC.) Acceleration = Mass x ForceD.) none of the above
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Answers
the answer is B.repair tissue
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(2) blue (4) yellow
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Answer is (2) - blue.
Thymol blue is a pH indicator which 3 colors according to the pH.
Thymol blue shows red color at below pH than 1.2 and shows yellow color at the pH between 2.8 and 8.0. For the pH above 9.6, thymol blue shows blue color.
Hence, the thymol blue has 2 pH ranges as 1.2 - 2.8 and 8.0 - 9.6.
Since, pH = 11 is above the pH = 9.6, thymol blue shows blue color.
Only Student A
Only Student B
Both Student A and Student B
Neither Student A nor Student B
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Answer : The correct option is, Only Student B
Explanation :
Lewis-dot structure : It shows the bonding between the atoms of a molecule and it also shows the unpaired electrons present in the molecule.
In the Lewis-dot structure the valance electrons are shown by 'dot'.
The given molecule is,
As we know that nitrogen has '5' valence electrons and hydrogen has '1' valence electron.
Therefore, the total number of valence electrons in = 5 + 3(1) = 8
According to Lewis-dot structure, there are 6 number of bonding electrons and 2 number of non-bonding electrons.
The Lewis dot structure of student A is wrong because there is a coordinate bond present between the nitrogen and hydrogen is not covalent.
The correct Lewis-dot structure of is shown by the student B.
Answer:
niether of them
Explanation:
the rest are bs
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Answer: Option (B) is the correct answer.
Explanation:
A covalent compound is a compound whose atoms are bonded together by sharing of electrons.
Also it is known that in covalent compounds weak inter molecular forces of attraction exists. Due to which it is easy to break the bond between atoms.
Hence, covalent compounds have low melting and boiling point .
Other properties of covalent compounds are as follows.
- They are brittle in nature.
- The do not have a rigid crystal structure.
- They exist as solids, liquids and gases.
- Covalent compounds do not conduct electricity.
Thus, we can conclude that out of the given options property that is typical of a covalent compound is that they have low melting and boiling points.
Answer: the correct option is (C).
Explanation:
Covalent compounds have lower melting and boiling points due to presence of weak inter-molecular forces by which molecules are weakly associated to each other. Hence, melting and boiling of covalent compounds occurs at low temperatures.
Usually, Covalents compounds have following properties:
- They are brittle solids
- They do not conduct electricity
- They do not have rigid crystal structure.
- They exist in all states: solids, liquids and gases.