If a molecule has four hybrid sp3 orbitals, it can be concluded that the molecule has a
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Required nutrients in foods that are made by other living organisms are_______
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Bombarding sodium-23 with a proton produces nuclide X and a neutron. What is nuclide X?Answers: magnesium-24magnesium-23neon-23 sodium-24 none of the aboveThe isotope P has a half-life of 14.3 days. If a sample originally contained 1.00 g of P, how much was left after 43 days?Answers: 0.250 g0.125 g 0.750 g0.500 gIdentify X in the reaction below. U + C → Cf + XAnswers: 1 alpha particle 3 protons6 neutrons 6 electronsA .20 gram sample of C-14 was allowed to decay for 3 half-lives. What mass of the sample will remain? Carbon-14 has a half life of 5730 years. Answers: 0.025 0.050.1 0.01 0.05The isotope Cu has a half-life of 30 s. If a sample originally contained 48 mg of Cu, how much time passed before the amount fell to 3 mg?Answers: 120 s240s30 s 60 s(when I did my calculation for the question above, I got 60 seconds) What radionuclide decays to Fe-56 by beta emission?Answers: Fe Co Mn Co MnHow do I know wat it becomes. I put 57 Co 27 and it's wrong.The Cf to Cf conversion is accompanied by __________.Answers: an alpha emission a neutron capturean electron capture an electron releaseI would greatly appreciate your help...ASAP. Thank you.
32 What is the overall charge of an ion that has 12 protons, 10 electrons, and 14 neutrons?(1) 2- (3) 4(2) 2+ (4) 4+
b. external diffraction.
c. total internal reflection.
d. interference
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Answer:
(C) Total internal reflection
Explanation:
Total internal reflection :
- It is the complete reflection of light in the medium ( medium may be glass ,water etc ) from the surrounding surface.
- Total internal reflection occur when angle of incidence is greater than the limiting angle ( limiting angle is also known as critical angle ).
- Light can be transmitted through long fiber optic due to total internal reflection
So the option (c) is the correct option
(2) 3.82 d (4) 34.38 d
Answers
Answer : The correct option is, (2) 3.82 d
Solution : Given,
As we know that the radioactive decays follow first order kinetics.
So, the expression for rate law for first order kinetics is given by :
where,
k = rate constant
t = time taken for decay process = 11.46 days
a = initial amount of the reactant = 200 g
a - x = amount left after decay process = 25 g
Putting values in above equation, we get the value of rate constant.
Now we have to calculate the half life of a radioisotope.
Formula used :
Putting value of 'k' in this formula, we get the half life.
Therefore, the half-life of a radioisotope is, 3.820 d
2. 11.46/3=3.82
The answer is (2).
N2(g) + 3H2(g)2NH3(g)
What is the percentage yield when 60 kg of ammonia is produced from 60 kg of hydrogen?
A
5.9%
B
17.6%
с
35.3%
D
50.0%
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Answer:
B
17.6%
Explanation:
1. Percentage yield = (Actual yield/theoretical yield) x 100
2. You know actual yield of ammonia (60kg) so you need to work out theoretical yield.
3. mols of hydrogen = m/mr = 60,000/2 = 30,000 mols.
4. 3:2 ratio so (30,000/3) x 2 = 20,000 mols of Ammonia.
5. Therefore mass of ammonia = mr x mols = 20,000 x 17 = 340,000 grams
6. So percentage yield is (60,000/340,000) x 100 = 17.6
A. In liters of water per moles of a dissolved substance
B. In liters of water per gram of a dissolved substance
O
C. In moles of a substance for 1 g of that substance
D. In moles of a substance dissolved in 1 L of water
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Answer:
D. In moles of a substance dissolved in 1 L of water
Explanation:
Just took the test
Final answer:
Molarity is measured in moles of a substance dissolved in 1 L of water.
Explanation:
The molarity is measured in moles of a substance dissolved in 1 liter of water, so the correct option is D. In moles of a substance dissolved in 1 L of water. Molarity is a measure of the concentration of a solute in a solution. It is calculated by dividing the number of moles of solute by the volume of the solution in liters.
Molarity (M) is indeed a measure of the concentration of a solute in a solution and is defined as the number of moles of solute per liter of solution. This means it is measured in "moles of a substance dissolved in 1 liter of solution" or simply "moles/L" or "mol/L." Molarity is a fundamental concept in chemistry and is widely used in various chemical calculations and experiments to express the concentration of a substance in a solution.
Learn more about molarity here:
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Answer:
Be. Beryllium
Explanation: