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Harlamova29_29 [7]
3 years ago
13

10. When a substance is analyzed using an electron microscope, it is found

Chemistry
1 answer:
Paraphin [41]3 years ago
7 0
A an element gn BBC dfhjhhgdsdgghh
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Report the number 315.05 to 3 significant figures.
emmainna [20.7K]

Answer:

315.

Explanation:

Hello.

In this case, since the given number has five significant figures as the zero is to the right of the first nonzero digit (3), if it is required to report it with three significant figures, it is necessary to "cut" it at the first five without any rounding since the subsequent zero is less than five.

Thus the number turns out:

315

Best regards.

5 0
3 years ago
Name the element described in each of the following:
borishaifa [10]

Alkaline earth metal whose cation isoelectric with Kr is strontium (Sr).

What is Alkaline earth metal?

Six chemical elements from group 2 of the periodic chart make up the alkaline earth metals. They are boron (R), barium (Ba), calcium (Ca), strontium (Sr), magnesium (Mg), beryllium (Be), and radium (Ra). The elements share many characteristics, including being glossy, silvery-white, moderately reactive metals at standard pressure and temperature.

They share a full outer s-orbital structurally, meaning that this orbital includes all two of its electrons, which the alkaline earth metals rapidly lose to form cations with a charge of +2 and an oxidation state of +2.

All of the identified alkaline earth metals are found in nature, albeit radium is not a primordial element but only appears as part of the decay chain of uranium and thorium.

The chemical element strontium has the atomic number 38 and the symbol Sr. Strontium is a soft, silver-white, yellowish metallic element that is an alkaline earth metal and has a strong reactivity to chemicals. When the metal is exposed to air, a thick layer of dark oxide forms. Similar to its two vertical neighbors in the periodic table, barium and calcium, strontium exhibits physical and chemical characteristics. It is mostly obtained from the minerals celestine and strontianite, where it is found naturally.

To learn more about Strontium  click on the link below:

brainly.com/question/19904990

#SPJ4

8 0
2 years ago
In redox reactions, _____________ occurs when electrons are lost by a molecule. ______________ occurs when electrons are gained
madam [21]

Answer:

Oxidation, Reduction

Explanation:

A redox reaction is a short form for reduction-oxidation.

Reduction is a term which means that electron is gained while oxidation is a term which means that electron Is lost.

The species that gain electron is known as the oxidizing agent while the species losing electrons is known as the reducing agent

6 0
3 years ago
Three factors affecting gas pressure are the amount of gas, temperature, and __________.
Olenka [21]
It's A. volume
Pressure = \frac{moles * const * temperature}{volume}
with const depends on the chosen unit of volume
I think so... 
8 0
3 years ago
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JWhat type of evidence is gathering information through your senses or using scientific tools?
Ad libitum [116K]
Observations etc etc
8 0
2 years ago
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