When the first periodic table of the elements was published, the elements were arranged by atomic mass. Although several elements seemed out of order, later discoveries showed the order to be correct. Which event most likely helped the development of the periodic table?
Answers
Answer;
New information changed the understanding of the atom’s structure.
Explanation;
- Mendeleev is know as the Father of the Modern Periodic Table. His table allowed scientists to predict the existence of elements that hadn't been discovered.
- Mendeleev saw that when the elements were arranged in order of increasing atomic mass, those that had similar properties occurred in a repeating pattern. He predicted that elements yet to be found would fill the gaps in his table.
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The molar heat of vaporization of water is 40.7kJ/mol. How much heat must be absorbed to convert 50.0 grams of liquid water at 100oC to steam at 100oC?A) 1.46 X 10 kJ B) 1.13 X 102kJ C) 2.04 X 103kJ D) 3.66 X 104kJ
(2) 6.2 L (4) 4.0 L
Answers
The volume of sample when the gas is heated to 303 K is
Further explanation:
Charles’s law:
Charles’s work showed that at constant pressure, the volume-temperature relationship for a fixed amount of gas is linear. In other words, Charles’s law can be stated that at constant pressure, the volume occupied by a fixed amount of a gas is directly proportional to its absolute temperature (Kelvin). This relationship is known as Charles’s law.
The mathematical representation of Charles’s law is,
[P and n are constant]
Where,
⦁ V is volume occupied by the fixed quantity of gas.
⦁ T is the temperature of a gas.
⦁ P is the pressure of a gas.
⦁ n denotes the number of moles of gas.
The relationship can also be expressed as,
[P and n are constant]
Or it can also be expressed as follows:
…… (1)
Here,
is the initial volume of gas.
is the final volume of gas.
is the initial temperature of the gas.
is the final temperature of the gas.
Rearrange equation (1) to calculate .
…… (2)
The value of is 6 L.
The value of is 293 K.
The value of is 303 K.
Substitute these values in equation (2).
So option (2) is the correct answer.
Learn more:
1. Law of conservation of matter states: brainly.com/question/2190120
2. Calculation of volume of gas: brainly.com/question/3636135
Answer details:
Grade: Senior School
Subject: Chemistry
Chapter: Ideal gas equation
Keywords: Charles’s law, volume, temperature, pressure, volume temperature relationship, absolute temperature, constant pressure, relationship, V directly proportional to T, ideal gas, ideal gas equation number of moles, moles, P, n, V, T, volume of gas, 6.2 L, 303 K, 293 K, 6 L.
The volume of the sample after the gas is heated to 303 K is 6.2 L
The correct answer to the question is Option (2) 6.2 L
From the question given above, the following data were obtained:
Initial volume (V₁) = 6 L
Initial temperature (T₁) = 293 K
Final temperature (T₂) = 303 K
Pressure = constant
Final volume (V₂) =?
Using the Charles' law equation, we can obtain the final volume of the gas as follow:
Cross multiply
293 × V₂ = 6 × 303
293 × V₂ = 1818
Divide both side by 293
V₂ = 6.2 L
Therefore, the volume of the sample after the gas is heated to 303 K is 6.2 L
The correct answer to the question is Option (2) 6.2 L
Learn more: brainly.com/question/16927784
Answers
The position where the moon is located where its shadow may sometimes reach Earth is position A .
What is an eclipse?
We know that in the outer space there are a lot of celestial bodies that can be found. Now we know that a celestial body is one that can be found in the outer space and the moon and the sun are all parts of the celestial bodies that we can find in the solar system.
In this case we are being asked for the position of the moon that could lead to an eclipse where the moon would come between the earth and the sun and that is the position A.
Learn more about eclipse:brainly.com/question/4279342
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Final answer:
The position of the Moon’s shadow reaching Earth is not dependent on Earth’s position in its orbit around the Sun but on the relative positions of the Moon, Earth, and Sun. If the Moon is located directly between the Earth and the Sun, the Moon's shadow can sometimes reach Earth.
Explanation:
The position of Earth with respect to the Moon is not necessarily related to its position in its orbit around the Sun, but with the positioning and phases of the Moon relative to the Sun and Earth. When the Moon is positioned between the Earth and the Sun, we typically have a New Moon phase. During this positioning, if everything aligns perfectly, it is possible for the Moon's shadow to reach Earth, causing an eclipse. This can occur at any position of Earth's orbit around the Sun, provided the Moon is located appropriately.
Learn more about Moon's shadow here:
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Answers
Respiration is the chemical process by which organic compounds release energy. The compounds change into different ones by exergonic reactions. The hydrolysis of adenosine triphosphate (ATP) to adenosine diphosphate (ADP) and phosphoric acid (Pi) releases energy (it is an exergonic reaction).
Answers
\[ N = N_0 \times \left(\frac{1}{2}\right)^{\frac{t}{t_{\text{half}}}} \]
Where:
- \( N \) is the remaining amount after time \( t \) (0.75 mg in this case)
- \( N_0 \) is the initial amount (6.25 mg)
- \( t \) is the time elapsed (111 days in this case)
- \( t_{\text{half}} \) is the half-life we're trying to find
We'll rearrange this formula to solve for \( t_{\text{half}} \):
\[ \frac{N}{N_0} = \left(\frac{1}{2}\right)^{\frac{t}{t_{\text{half}}}} \]
Taking the natural logarithm of both sides:
\[ \ln\left(\frac{N}{N_0}\right) = \frac{-t}{t_{\text{half}}} \times \ln\left(\frac{1}{2}\right) \]
Now, plug in the given values:
\[ \ln\left(\frac{0.75\, \text{mg}}{6.25\, \text{mg}}\right) = \frac{-111\, \text{days}}{t_{\text{half}}} \times \ln\left(\frac{1}{2}\right) \]
Solve for \( t_{\text{half}} \):
\[ t_{\text{half}} = \frac{-111\, \text{days}}{\ln\left(\frac{0.75\, \text{mg}}{6.25\, \text{mg}}\right) / \ln\left(\frac{1}{2}\right)} \]
Now, calculate this to find the half-life.
Using the provided formula to calculate the half-life (\( t_{\text{half}} \)), we get:
\[ t_{\text{half}} = \frac{-111\, \text{days}}{\ln\left(\frac{0.75\, \text{mg}}{6.25\, \text{mg}}\right) / \ln\left(\frac{1}{2}\right)} \]
Plugging in the values and calculating:
\[ t_{\text{half}} ≈ \frac{-111\, \text{days}}{-1.4978} \]
\[ t_{\text{half}} ≈ 74.24\, \text{days} \]
So, the half-life of Cr51 is approximately \( 74.24\, \text{days} \).
Help
Answers
Answer:
Thermohaline Circulation
Explanation:
The process is known as “Thermohaline Circulation”. In the Earth’s polar regions ocean water gets very cold, forming sea ice. As a consequence the surrounding seawater gets saltier, because when sea ice forms, the salt is left behind. As the seawater gets saltier, its density increases, and it starts to sink.
Answers
Molarity NaOH = 0.1 M
Number of moles NaOH :
n = M * v
n = 0.1 * 0.054
n = 0.0054 moles of NaOH
Finally we calculate the number of moles of HCl in the solution from the stoichiometry of the reaction :
HCl + NaOH = NaCl + H₂O
1 mole HCl -------- 1 mole NaOH
? moles HCl ------- 0.0054 moles NaOH
moles HCl = 0.0054 * 1 /1
= 0.0054 moles of HCl
Volume of HCl = 125 mL / 1000 = 0.125 L
M ( HCl ) = n / V
M = 0.0054 / 0.125
= 0.0432 M
hope this helps!