When gaseous hydrogen chloride is passed through a sodium chloride solution, precipitation of the sodium chloride occurs as a result of an excess of chloride ions in the solution (caused by the dissociation of HCl). Here the concentration of H⁺ decreases. The correct option is D.
When another electrolyte (which includes an ion that is also present in the first electrolyte, i.e., a common ion) is added, the common ion effect suppresses the ionisation of the first electrolyte. It is thought to be a result of Le Chatlier's principle, often known as the equilibrium law.
An increase in the concentration of one of the ions dissociated in the solution by the addition of another species containing the same ion will result in an increase in the degree of association of ions in a solution where there are several species associating with each other via a chemical equilibrium process.
Here the common ion 'F' in KF supresses the dissociation of HF.
Thus the correct option is D.
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Sawing a board in half is a physical change not a chemical change the board doesnt change wood or whatever material it is is still would still be wood
If it were burned it would be a chemical change but its properties stay the same atomically so thats why its not a chemical change.
b. nuclear energy.
c. sharing nuclei.
d. attractive forces.
Answer:
a. Chemical bonds.
Explanation:
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In this case, it is necessary to know that when two elements are not stable by their own they should bond with an other atom of the same element via chemical bonds whereby the valence electrons act as bridges connecting the atoms. Some examples are diatomic-gaseous hydrogen, oxygen, nitrogen, chlorine, iodine, fluorine and bromine. Moreover, such chemical bonding is represented by lines binding the elements as shown on the attached picture.
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Answer:
Explanation:
125 cm3 -> 0.125 L
M = no. mole / volume (L)
M = 0.25 / 0.125 = 2 M
Position 2
position1
position4
position3
Answer: Position 1
Explanation:
Seasons on Earth occur due to tilt of of its axis. Earth's axis is tilted 23.5° from horizontal. Thus, when Earth moves in the orbit around sun, sometimes the northern hemisphere points towards the Sun and sometimes away. When it points towards the Sun, it experiences Summer season and while it points away, winter occurs. In between, spring and autumn occur.
Thus, from the given diagram, norther hemisphere would have summer time at position 1 when the northern hemisphere is facing the Sun.
Answer:
The correct answer is Position 1.
Explanation:
The rotational motion of the Earth causes some parts to receive more heat from the sun, while others receive less. Its axis of rotation runs vertically from the North Pole to the South Pole. Since this axis is not completely vertical, the sun's rays are projected with different intensity during the translation movement. Since the Earth is tilted slightly to the left and the axis points to the side where the Sun is at position 1, the sun's rays reach the northern hemisphere with more intensity and the southern hemisphere with less intensity.
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B. Impulses have to be sent to the brain through the auditory nerve.
C. The brain has to interpret the direction from which the sounds are being delivered.
D. The outer ear has to collect the sound waves and lead them to the middle ear.
Answer : Option D) The outer ear has to collect the sound waves and lead them to the middle ear.
Explanation : Hearing is dependent on a series of complex steps that change vibrations of sound waves in the air into electrical signals. At first the vibrations of sound waves gets collected by the outer ear and from there sound waves travel through a narrow passageway called the ear canal, which leads to the eardrum. The eardrum vibrates from the incoming sound waves and sends these vibrations to three tiny bones in the middle ear. The auditory nerve then carries these signals to the brain.