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algol13
3 years ago
8

How do scientists know that the universe is expanding?

Chemistry
2 answers:
aksik [14]3 years ago
7 0

It is known that the elements captivate and emit specific wavelengths of light, that is, the part of the electromagnetic spectrum. By examining the wavelengths of light discharged by an object in space, one can attain an ample amount of information. The astronomers studied the variation in the position of lines in the spectrum from a star, this can predict the distance of the star, that is, and whether it is moving away or towards us, and how quickly it is moving.  

While studying the radiation discharged by the galaxies or the distant stars, the scientists witnessed the shifting of emission spectra towards the red region of the electromagnetic spectrum, that is, the witnessed wavelengths are longer than anticipated.  

There is something, which is responsible for the wavelength of the radiation to stretch. However, in spite of a real variation in the wavelength, this procedure was something identical to the Doppler Effect.  

DanielleElmas [232]3 years ago
4 0
Galaxies are moving away from us and the farther away a galaxy is the faster it is moving away from us. The galaxies seem to be receding from us because the entire universe is getting larger.
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Substance A dissolves in water. What can be said about substance A?
8_murik_8 [283]

Answer:

It is polar.

Explanation:

Water is a polar solvent and it can only dissolve another solute or substance.

As a general rule of solubility "likes dissolves likes".

This implies that when a polar solvent is used, it will dissolve a polar solute.

Also, a non-polar solute will only dissolve in a non-polar solvent.

  • Water is an example of polar solute.
  • Other solutes such as salt can dissolve in water because they are polar in nature.
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7 0
3 years ago
140 g of apple contains about
Mamont248 [21]

Answer:

630 grams

Explanation:

140/80 = 1.75

360 times 1.75 = 630

3 0
3 years ago
How are petrified fossils similar to preserved remains? How are they different?
konstantin123 [22]

Well, both fossils and preserved remains retain the shape and form of the remains, but fossils do not actually retain the matter that made up the remains, instead, bones and tissues (usually just bones) have been replaced with stone.


4 0
4 years ago
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What is the volume of 3.5 moles of chlorine gas at standard temperature and pressure (STP)? (3 points)
Vera_Pavlovna [14]

Answer:

State any two differences between acute diseases and chronic diseases.

Explanation:

State any two differences between acute diseases and chronic diseases.

6 0
3 years ago
Three of the terms describe the compounds. a. Anomers have a different configuration only about the anomeric carbon atom.b. Dias
yKpoI14uk [10]

Answer:

The Three terms that describe the compounds are:

b. Diastereoisomers have different configurations at one or more (but not all) of the equivalent stereocenters and are not mirror images of each other.

c. Enantiomers are mirror images of each other, and so differ in configuration at all stereocenters.

d. Epimers are diastereomers that differ in configuration of only one stereogenic center.

Explanation:

Anomers are isomers of monosaccharides with more than 5 carbon atoms that have developed a hemiacetal bond, can take a cyclic structure and determine 2 different positions for the oxydryl ion.

6 0
3 years ago
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