Gesso is a white paint blend that comprises pigment, chalk and gypsum. It is a medium utilised for surface preparation and as a primer for a painting.
<h3>What are the uses of gesso?</h3>
Gesso is widely utilized for preparing surfaces and as primers by painters. They were used by painters and artists earlier to make canvas, boards for painting purposes.
It was first formulated by chalk powder dust and pigment derived from the animal skin. They are widely used because of their adhering properties.
The use of the gesso makes the paint adhere to the canvas and the board surfaces and also, makes the surface textured.
Therefore, option b. it is used for preparing the surface is correct.
Learn more about gesso here:
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Answer:
C) When electrons change levels to produce the Balmer series, the emitted light is in the visible part of the spectrum
Explanation:
The Balmer Series of lines in the hydrogen atom was very important in the history of physics and astronomy. What made it so important?
A) It helped Rutherford explain the workings of the atomic nucleus.
B) Balmer's experiments with these lines helped prove Wien's Law.
C) When electrons change levels to produce the Balmer series, the emitted light is in the visible part of the spectrum.
D) The Balmer series of lines can only be observed from outer space; so the competition to see these lines led to the space race.
E) Mr. Balmer never got the Nobel prize, which made everyone in the field of spectroscopy so angry, they worked extra hard.
the most appropriate will be
C) When electrons change levels to produce the Balmer series, the emitted light is in the visible part of the spectrum
Balmer series of hydrogen lines. These lines are emitted when the electron in the hydrogen atom moves from the orbital n = 3 or greater shell down to the n = 2 shell/orbit. ... Energy is emitted from the atom when the electron leaps from one orbit to another closer to the nucleus.
Wiens law has to do with the radiation of a black body.
Answer:
2, the acid is H₂X.
Explanation:
- It is known at equivalence point: the no. of millimoles of base is equal to the no. of millimoles of acid.
<em>∴ (nMV) of NaOH = (nMV) for HnX.</em>
where, n is the no. of producible H⁺ or OH⁻ of the acid or base, respectively.
M is the molarity of the acid or base.
V is the volume of the acid or base.
n = 1, M = 0.4 M, V = 0.6 L.
n = ???, M = 0.3 M, V = 0.4 L.
∴ n for HnX = (nMV) of NaOH / (MV) for HnX = (1)(0.4 M)(0.6 L)/(0.3 M)(0.4 L) = 2.
∴ the acid is H₂X.
Answer:
Iron (Fe)
Explanation:
The number of electrons (-) is usually the same as the number of protons (+) in the atom of the element (unless it is an ion).
The element described has 26 electrons, so we can assume that it has 26 protons as well. The number of protons in an atom is the atomic number of element that the atom is.
Element 26 on the PTE is Iron (Fe), which does rust (oxidation) in air and water.
