Which statement describes how an atom in the ground state becomes excited?(1) The atom absorbs energy, and one or more electrons move to a higher electron shell.
(2) The atom absorbs energy, and one or more electrons move to a lower electron shell.
(3) The atom releases energy, and one or more electrons move to a higher electron shell.
(4) The atom releases energy, and one or more electrons move to a lower electron shell.
Answers
1) The atom absorbs energy, and one or more electrons move to a higher electron shell.
- An atom changes from a ground state to an excited state by taking on energy from its surroundings in a process called absorption.
- The electron absorbs the energy and jumps to a higher energy level.
- In the reverse process, emission, the electron returns to the ground state by releasing the extra energy it absorbed.
So all the statements except 1) are false.
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What is the chemical formula for sodium sulfate?(1) Na2SO3 (3) NaSO3(2) Na2SO4 (4) NaSO4
b. hydration
c. deliquescent
d. solvation
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Let us understand all the terms
Hydration : this is the addition of water to anything. It can be addition of water to double or triple bond, absorption of water by a substance. so it cannot be loss of water.
Deliquescent : it is the absorption of water by a substance and getting dissolved in it. Like NaOH is a deliquescent substance.
Solvation: It is the phenomenon where a substance get surrounded by solvent molecules. If solvent is water it is known as hydration.
Thus the answer is
effloresce : where a substance loses water.
Answers
Answer:
A carbon-14 atom has 6 protons, 8 neutrons and 6 electrons. The number 12 or 14 in the name of carbon-12 and carbon-14 refers to their atomic mass.
Explanation:
Those atoms that have the same "atomic number" but differente "atomic mass" (or atomic weight) are called isotopes.
Atomic number indicates the amount of electrons that an atom has, which matchs with the number of protons it has.
Atomic mass indicates the sum of protons and neutrons that an atom has.
Example with carbon-12:
carbon atomic number = 6 (find this information in a periodic table)
electrons= 6
protons= 6
carbon atomic mass = 12 (find this information in a periodic table)
neutrons= atomic mass - number of protons= 12-6 = 6 neutrons
Using the same analysis for carbon-14:
carbon atomic number = 6
electrons= 6
protons= 6
carbon atomic mass = 14
neutrons= atomic mass - number of protons = 14-6 = 8 neutrons
In this way, carbon-14 is an isotope of carbon-12 because carbon-14 has the same atomic number than carbono-12 but different atomic mass.
Answers
Examples of lipid-soluble hormones are steroids. Examples of water-soluble hormones are polypeptides.
Final answer:
Lipid-soluble hormones pass through the cell membrane and directly interact with the cell's DNA, while water-soluble hormones bind to surface receptors, triggering intracellular signaling pathways.
Explanation:
In the field of Biology, the principal difference between lipid-soluble and water-soluble hormones lies in their mechanism of action. Lipid-soluble hormones, like steroid hormones, can easily pass through the cell membrane and interact directly with the cell's DNA to influence gene transcription. On the other hand, water-soluble hormones cannot cross the cell membrane due to their polarity. Instead, these hormones (such as peptides and amines) bind to receptors located on the cell's surface, triggering a series of intracellular events or signaling pathways that lead to a cellular response.In contrast, water-soluble hormones cannot passively cross the cell membrane due to their hydrophilic nature. They bind to specific receptors on the cell surface, triggering a cascade of intracellular signaling events through secondary messengers, such as cAMP or calcium ions. These signaling pathways ultimately result in the desired cellular response.
Learn more about Hormones Mechanism of Action here:
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Answer: It decreases.
Explanation: Solubility of gas in a particular liquid is the volume of gas in ml that can dissolve in unit volume of the liquid to form the saturated solution at the given temperature and under a pressure of 1 atmosphere.
Effect of temperature on solubility of gas:
Solubility of gas decreases with increase in temperature as on heating some gas is expelled out of the solution.
According to Le Chateliers principle , on increasing the temperature, the reaction will shift in a direction where temperature is decreasing i.e. backward direction and thus the solubility would decrease.