Which scientist did people think was insane so they dismissed his ideas for almost 2000 years?
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I think let me know if I am wrong
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Which list of elements contains a metal, a metalloid, a nonmetal, and a noble gas?(1) Be, Si, Cl, Kr (3) K, Fe, B, F(2) C, N, Ne, Ar (4) Na, Zn, As, Sb
element x has an electron configuration of 1s²2s²2p⁶3s¹, while element z has an electron configuration of 1s²2s²2p⁵. a) which element would have greater first ionization energy? b) which element would have a larger radius? c) which element would have higher electronegativity? d) which element would form an ion that has a larger radius? e) which element would release more energy when it gains an electron?
An Arrhenius acid has(1) only hydroxide ions in solution(2) only hydrogen ions in solution(3) hydrogen ions as the only positive ions in solution(4) hydrogen ions as the only negative ions in solution
A student is trying to solve the following problem by selecting the tile shown.Mass of containerWhich of the following statements is true?A. The student chose the wrong tile to solve the problem.B. The student chose the correct tile, but needs to flip the tile to make the units cancel.C. The student chose the correct tile, but needs to add a second tile to solve the problem.D. There is nothing wrong. The problem is ready to be solved.
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Answer:
K = 2 × 10⁻⁷²
Explanation:
Step 1. Determine the value of n
Zn²⁺ + 2e⁻ → Zn
2Cl⁻ → Cl₂+ 2e⁻
Zn²⁺ + 2Cl⁻ → Zn + Cl₂; E = -2.12 V
n = 2 mol electrons
===============
Step 2. Calculate K
The formula relating E and K is
E = (RT)/(nF)lnK
E = -2.12 V
R = 8.314 J·K⁻¹mol⁻¹
T = 298.15 K
n = 2
F = 96 485 C/mol
-2.12 = (8.314 × 298.15)/(2 × 96 485)lnK Do the multiplications
-2.12 = 2479/192 970 lnK Do the division
-2.12 = 0.012 85 lnK Divide both sides by 0.012 85 and transpose
ln K = -165.0 Take the antilog of both sides
K = 2 × 10⁻⁷²
B) penetration.
C) paramagnetism.
D) electron-pair repulsion.
E) relativity
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Answer:
A = shielding.
Explanation:
The addition of electron causes the atomic size increase from top to bottom due to increase in atomic number.
As the atomic number increased one more electron is added and because of this electron on more electronic shell is added. Thus the electron become more away from the nucleus as many of other electrons are present in the way from nucleus to the outer electrons.
The hold of nucleus becomes weaker. Although nuclear charge is also increased but at the same time other electrons shield the respective electrons. So effective nuclear charge is weaker than the actual nuclear charge.
Because of this shielding it is easy to remove the electrons or we can say ionization energy decreases.
Here, we are required to determine why the effective nuclear charge for an atom is less than the actual nuclear charge.
- The correct answer is Choice A: Shielding
First, we must know that the effective nuclearcharge is the net positive charge exerted on the negatively charged Valence electrons by the nucleus.
- The concept of shielding is best used to explain why electrons are easier to remove in biggeratoms, i.e atoms with larger atomic radius.
The bigger an atom is, the farther are it's Valence electrons from the positively charged nucleus.
- The concept above is due to the presence of other electrons in shells between the Valence electron and the nucleus.
The shielding effect of these electrons therefore, reduce the nuclear charge that is felt by the valence electrons and ultimately, the effective nuclear charge is less than the actual nuclear charge.
- P.S: The more shielding, the lower is the effective nuclear charge on Valence electrons.
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Density is defined as the ratio of mass to volume of a substance.
The density of water is generally known to be 1.0 g/mL. Substances that are less dense than water will float on water while substances that are denser than water will sink in water.
We have to calculate the density of the block material in units of g/ml.
Volume of the block = = 19.66 mL
Mass of the block = 350 lb = 158757 g
Density of the block =
Density of block =
= 8075.13 g/mL
Hence the block material will sink in water.
Learn more: brainly.com/question/14373997
density of water is approximately 1.0 g/mL
block of material
volume of 1.2 x 10^4 in^3
and weighing 350 lb
Required:
Which will float
Solution:
D = M/V where D is density, M is mass and V is volume
convert 1.2 x 10^4 in^3 into mL
1.2 x 10^4 in^3 (16.39 mL/ 1 in3) = 196,980 mL
convert 350 lb into grams
350 lb (454 grams/1 lb) = 158,900 grams
D = M/V = 158,900 grams/ 196,980 mL
D = 0.807 g/mL
The block will float in water because it is less dense than water
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Answer:
a salt
Explanation:
compounds are made of molecules but we need to mention the type of compound formed.
Answer:
A salt
Because compounds are made of molecules but we need to mention the type of compound formed.
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