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NARA [144]
3 years ago
11

What description best describes both mirrors and lenses?

Chemistry
2 answers:
WITCHER [35]3 years ago
7 0
Mirrors reflect light and lenses refract light.
Mirrors form images by reflecting all light that is incident on their surface, which allows us to see the reflections of objects in mirrors. Lenses, on the other hand, bend light and allow it to pass through them. The bending of light is used to form enlarged images, and for many other purposes as well.
Ulleksa [173]3 years ago
3 0

<u>Answer:</u> The correct statement is mirrors reflect light and lenses refract light.

<u>Explanation:</u>

Mirrors are defined as the piece of glass which has a shiny coating on one side. This shiny coating helps in the reflection of light when light rays falls on it. Reflection of light is defined as the process of throwing back of light rays after touching the surface.

Lenses are defined as the piece of glass which does not have any shiny coating and when light rays pass through it, the light rays get refracted. Refraction of light is defined as the process of bending of light when a medium is changed.

Hence, the correct statement is mirrors reflect light and lenses refract light.

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How many atoms are in 3.2 moles of chromium?
-BARSIC- [3]

Hey there!

1 mole has 6.022 x 10²³ atoms.

Multiply that by 3.2 because we have 3.2 moles.

3.2 x 6.022 x 10²³

1.9 x 10²⁴

There are 1.9 x 10²⁴ atoms in 3.2 moles of chromium.

Hope this helps!

3 0
3 years ago
Plssss help. 20 points!!!!!!!!!. Use periodic trends on the periodic table to predict the following.
krok68 [10]

Answer:

i. Atomic radius of an atom is defined as the total distance from the nucleus to the outermost shell of the atom.

On moving from left to right  ( Mg, K) in a period, more and more electrons get added up in the same shell and the attraction between the last electron and nucleus increases, which results in the shrinkage of size of an atom. Thus, decreasing the atomic radii of the atom on moving towards right of the periodic table.

As moving from top to bottom, there is an addition of shell around the nucleus and the outermost shell gets far away from the nucleus and hence, the distance between the nucleus and outermost shell increases.

Thus the order of atomic radii is : Ca > Mg > K

ii. The energy required to remove the last valence electron from isolated gaseous atom (first ionization energy) increases as we move from left to right in a period. It decreases on moving from top to bottom.

Thus the order of first ionization energy is : K > Mg > Ca

iii. The chemical properties depend on the valence elctrons and as the elements Mg and Ca both have two valence electrons , they have same chemical properties.

4 0
3 years ago
In general, what would a scientist do after forming a testable question ?
makvit [3.9K]
<span> a scientist would do after forming a testable question is </span>test the question. 
8 0
4 years ago
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How many objects in the solar system have been confirmed to currently support life?
yulyashka [42]
B. One
I believe that earth is the only planet that has life that we know of on it.
6 0
3 years ago
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Which of the following is a strong reducing agent? Explain how you know.
swat32
The answer is: <span>The principal idea here is how r they obtained: 
for example: sodium  u put equal molar concentrations of sodium (Na) and sodium ion (Na+)  together in a beaker , then dip in this solution a platinium wire (zero potential) which is connected to a normal hydrogen electrode (electrode with zero potential)  then u see the reading of the whole circuit 
if it is negtive, this means negative potential which means that the reducing property predominates where Na(reducing agent) is oxidized and electrons r accumulated on the platinum which gives it negative charge 
This means that (Na) is a reducing agent, its strength depends on the value of the potential obtained, and here the table can help you 
If u want to know if it's strong red. agent, look for it in the table, see if it has higher reduction potentail (or lower oxidation potential, same idea) than most other substances then it is reducing agent 
and vice versa 

So if we look at ur examples, u will find that MnO4- is the very strong oxidizing agent (has highest oxidation potential) (lowest reduction potential) 

H+ and H2 are both with zero potential, no redox properties 

And lastly Na and Na+: 
This u can know from ur knowledge in chemistry, that sodium is very rarely found in elemental form and always in the form of ion so u can deduce that Na is the very strong reducing agent 
or u can see the value of its standard oxi or red potetial and deduce which is the predominating form of them. 

I hope this helps</span>
4 0
4 years ago
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