An appropriate hypothesis explaining the observation of distant galaxies moving away from each other, and that they do so more rapidly the further they are can be found in the Big Bang Theory. This theory suggests our universe began with a 'big bang' causing galaxies to move away from each other, a process which continues today.
Based on the observations mentioned, an appropriate hypothesis might involve the Big Bang Theory. This theory in physics and astronomy assumes that our universe started from a singularity - a very high-density and high-temperature state. The Big Bang Theory suggests that after the initial explosion, the galaxies began moving away from each other, a process which continues till today.
The farther a galaxy is from us, the faster it's receding, which is known as Hubble's Law. This observed phenomenon matches with the theory's premise, providing validating evidence for the Big Bang.
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b. False
A. true.
The statement that Eisenhower, Kennedy, and Johnson all approved of the United States backing the South Vietnamese in their civil war is absolutely true. After the communist North Vietnam got her Independence in 1954, there began a civil war in South Vietnam. The communist insurgents backed by North Vietnam turned against the South Vietnam government. So US supplied its soldiers in South Vietnam to suppress the communist insurgents and the move was approved by Eisenhower, Kennedy, and Johnson.
Answer:
Yes, they are useful.
Explanation:
They allow us to make use of strengths and benefits of a particular element while not being hampered by it's faults.
Includes Sulfur
Gain 2 electrons
Tend to form +2 ions
Have 5 valence electrons
Answer:
The answer to your question is: Includes sulfur and gain two electrons
Explanation:
Includes Chlorine This option is wrong, Chlorine belongs to group VII.
Includes Sulfur This option is true, Group VI includes Oxygen, Sulfur, Selenium, Tellurium.
Gain 2 electrons. This option is true, Elements in group VI have six valence electrons so they gain to electrons to become estable.
Tend to form +2 ions This option is wrong, this elements form -2 ions
Have 5 valence electrons This option is wrong, this elements have 6 valence electrons.
87.75 grams of sodium chloride (NaCl) are required to prepare 500. mL of 3.00 M solution.
The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter.
A mole is defined as the amount of substance containing the same number of atoms, molecules, ions, etc. as the number of atoms in a sample of pure 12C weighing exactly 12 g.
Given,
Volume of NaCl = 500ml
Concentration = 3M
Moles = Concentration × volume
= 3 × 0.5
= 1.5 moles
Mass = moles × molar mass
= 1.5 × 58.5
= 87.75 g
Therefore, 87.75 grams of sodium chloride (NaCl) are required to prepare 500. mL of 3.00 M solution.
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Principal (shell) quantum number - n