CHEMISTRY HIGH SCHOOL

The difference in the direction is caused by the ______________.Please help!

Answers

Answer 1
Answer: What don’t understand question

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The combining of atoms together is known as nuclear

Answers

The correct word to fill the statement is fusion. The combining of atoms together is known as nuclear fusion.  This reaction happens where two or more nuclei of an atom comes very close at a very high speed and joins to form a new nucleus.

Ice (H2O) melting at 273 K and 1 atm has = 6.01 kJ/mol and = 6.01 kJ/mol while water vaporizing under the same conditions has = 37.6 kJ/mol and = 40.7 kJ/mol. Why is there such a large difference between and , but not for and ?

Answers

Answer:

Degree of intermolecular hydrogen bonding

Explanation:

The energy required to melt a solid substance and the temperature at which the solid melts depends on the structure of the solid crystal as also on the magnitude of the intermolecular forces present in the solid.

Ice is less dense than liquid water, there are spaces in the crystal structure of ice. Secondly, the magnitude of hydrogen bonding in ice is lower due to lower intermolecular interaction between the water molecules. Given the lower intermolecular interaction in ice, the heat of fusion is much lower since the intermolecular interactions are easier to break.

In liquid water, hydrogen bonding is much stronger and there is greater intermolecular interaction between the water molecules. It takes more energy to break down these intermolecular interactions, hence the high enthalpy of vaporization of liquid water.

After examining a cell with a microscope, a student concludes that it is a plant cell.What feature did the student most likely observe that led him to this conclusion?
(a) vacuole (c) chloroplast
(b) nucleus (d) cell membrane

Answers

Explanation:

The student most likely observed both (A) Vacuole and (C) Chloroplast that led him to the conclusion, that the cell is a plan cell.

Reason :

In a plant cell, Vacuole occupies 70% to 90% of the total volume of the cell, making it easier to identify.

Chloroplast contains photosynthetic pigment called chlorophyll (green in colour), which is only found in plant cell.

Final answer:

The presence of chloroplasts, containing green pigment chlorophyll for photosynthesis, in the cell likely led the student to conclude it was a plant cell.

Explanation:

The student likely made his conclusion based on observing the presence of chloroplasts in the cell. Chloroplasts contain a green pigment called chlorophyll, which enables plants to undergo photosynthesis and is not found in animal cells. The others listed (vacuoles, cell membrane, and nucleus) are also present in animal cells and therefore would not specifically indicate a plant cell.

Learn more about Plant Cell Identification here:

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Ions can have a positive or negative charge. false or true

Answers

True. Ions can have a positive or negative charge.
I want to say that its true

Which of the following instruments is used to measure air pressure? A. Thermometer
B. Barometer
C. Hygrometer
D. Anemometer

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The barometer is used to measure air pressure. 

Answer: Barometer 
A barometer measures air pressure

The first barometer was invented in the early 1600. The first barometer had mercury in a small basin with an upside down glass tube placed in the mercry.

In which substance do the molecules have the strongest attractions to one another ?

Answers

The molecules have the strongest attraction to one another in a substance called sugar. 
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