_______ is a media that consists of natural or synthetic mineral or plant substances that deposit crystalline or splinter-like fragments in the paper fibers.a. Dry media
c. Silverpoint
b. Ink painting
d. Liquid media
Answers
Answer : Option A) Dry media
Explanation : i) Dry media is a media that deposits graphite, charcoal, pastels, ordinary pencils, then moistened with a wet brush to get various painterly effects on the paper fibers.
ii) Silverpoint - Silverpoint media uses red chalk or traces of black pencil on white-coated paper usually the manuscripts,
iii) Ink Painting - Uses various inks on the paper.
iv) Liquid media - uses liquid pigments suspended in some base which in liquid state that soaks the paper.
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Answers
According to the concept of Avogadro's number, there are 1.499 moles of hydrogen gas contained in 9.03 x 10²³ molecules.
What is Avogadro's number?
Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.
It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .
According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.
Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number
Number of moles is calculated from Avogadro's number as, 1 mole=6.023×10²³ molecules , thus 9.03×10²³ molecules will have 9.03×10²³ /6.023×10²³=1.499 moles.
Thus, there are 1.499 moles of hydrogen gas contained in 9.03 x 10²³ molecules.
Learn more about Avogadro's number,here:
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Hope that helps!!
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Select one:
a. Wave A and Wave B travel through Earth's interior.
b. Wave A and Wave B are absorbed by liquid medium.
c. Wave A and Wave C are absorbed by liquid medium.
Answers
On a seismogram, the first recorded waves are the P type, followed by the S type and, finally, the surface waves. Option A) A and B travel through Earth's interior.
Note: the question was answered according to the attached image. Look at the seismogram and the explanation, and if your image differs from this one, apply the same reasoning to answer the question.
What are the Seismic waves?
When rocks break during plate movements, they generate waves that propagate, moving inside the Earth and on its surface. These are the seismic waves.
What are the Types of seismic waves?
There are three types of waves,
- P waves ⇒ consist of the transmission of the rock's compressions and rarefactions. These waves can be transmitted in the interior of the Earth.
P waves are the fastest in moving and can be transmitted through different materials, liquid or solid.
- S waves ⇒ they move in a perpendicular direction to the disturbance propagation direction. These waves can also be transmitted in the interior of the Earth.
S wavesare slower and can not be transmitted through liquid masses.
- Surface waves ⇒ They can only propagate through the most superficial layers of the Earth. Their amplitude decrease with depth.
Surface waves are the slowest ones.
Due to the difference in the speed, the first recorded waves on a seismograph during an earthquake are the P waves, followed by the S waves, and finally, the surface waves.
The difference in waves' speed is used to determine the location of the earthquake focus and the structures of Earth.
As waves move through different materials, they change their speed. This change leads scientists to know what type of masses they are going through.
Following the waves from earthquake focus and recording their travel speed is helpful to determine the structures of Earth's interior.
The provided seismogram shows,
A- P waves ⇒ Transmitted in the interior of the Earth ⇒ first ones to be recorded. They are absorbed by liquid and solid medium.
B- S waves ⇒ Transmitted in the interior of the Earth ⇒ second ones to be recorded. They are absorbed by solid medium.
C- Surface waves ⇒ Transmitted in the syperficial layers of the Earth ⇒ last ones to be recorded. They are the slowest ones.
According to this information, we can assume that the correct option is a. Wave A and Wave B travel through Earth's interior.
You can learn more about earthquake waves at
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ii) AlCl3 + NH4OH <----> Al(OH)3 + NH4Cl
iii) FeCl3 + Ca(OH)2 <----> CaCl2 + Fe(OH)3
iv) Pb(ClO3)2 + K2SO4 <----> PbSO4 + KClO3
v) Na + HOH <----> NaOH + H2
vi) Zn + HCl <----> ZnCl2 + H2
vii) Al + AgCH3COO <----> Al(CH3COO)3 + Ag
viii) MgO + HNO3 <----> Mg (NO3)2 + H2O
ix) MnO2 <----> Mn3O4 + O2
b) Why is it incorrect to alter the chemical formula when balancing an equation?
Answers
i)
ii)
iii)
iv)
v)
vi)
vii)
viii)
ix)
B- Because chemical formula has its own unique set of elements and subscripts
Hope this Helps :)
Answers
Answer:
A) 2Na + = 2NaBr
Explanation:
As the problem says that you should find the balanced chemical equation for the synthesis of NaBr from Na and , the reactants are Na and
and the product is NaBr, so it can be writen as:
Na + = NaBr
Then you shoud balance the equation, it means that you should have the same number of each element in each part of the equation, so if you put a number 2 for the NaBr and the Na, the equation will be balanced:
2Na + = 2NaBr
Answers
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