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makvit [3.9K]
3 years ago
5

Please help. Last grade of this class

Chemistry
1 answer:
Marat540 [252]3 years ago
5 0

Answer: Question 3

Group 14, Period 3 is a metalloid

Explanation: Question 3

The element in group 14, period 3 on the periodic table is Si. Metalloids are elements which share both non-metallic and metallic characteristics.

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Why is the separation of mixtures into pure or relatively pure substances so important when performing a chemical analysis?
N76 [4]

Answer:

It is important to separate mixture into pure or relatively pure substances when performing a chemical analysis SO AS TO KNOW THE PROPERTIES COMING FROM EACH PART MIXTURE WHICH MAY INTERFERE WITH THE SEPARATION.

Explanation:

In chemistry, Mixture is the combination of two or more substances which are not combine chemically.

Mixture contain different substances with different physical and chemical properties.

It is important to purify the substances in a mixture so as to identify what properties are coming from each mixture and also some part of the mixture can interfere with the properties of other mixture present for skewing analysis.

3 0
3 years ago
Which is true for every atom of an element?
antoniya [11.8K]

C. It has mass and volume

Explanation:

Every atom of an element has mass and volume. Mass is the amount of substance it contains this is usually a function of their subatomic particles.

The bulk of the mass of an atom is concentrated in the nucleus where we have protons and neutrons. Electrons do not really add much to the mass of an atom.

Atoms also have specific volume.

  • The reason for our selection is that atoms are the smallest particle of matter.
  • Matter is anything that has weight and occupies space.
  • Since it is matter, it must have specific weight and volume

learn more:

Matter brainly.com/question/8839455

#learnwithBrainly

6 0
3 years ago
18 g of argon occupy 750 ml at a particular temperature and pressure. How many grams of methane would occupy the same volume at
frozen [14]

Answer:

7.21 grams is the mass of methane

Explanation:

We may use the Ideal Gases Equation to solve this:

P. V = n. R. T

Let's determine the moles of Ar

18 g . 1 mol/ 39.9 g = 0.451 mol

In both situations, volume, temperature and pressure are the same so the moles of methane will also be the same as Argon's.

Let's convert the moles to mass of CH4.

0.451 mol . 16g/1mol = 7.21 grams

5 0
3 years ago
Which of the following is most likely to be a conductor
aleksandr82 [10.1K]

Answer:

A compound containing metallic bonds.

Explanation:

8 0
3 years ago
The smallest particle of matter that retains the chemical properties of carbon is a carbon:
Drupady [299]
The answer will be Carbon Molecule
7 0
3 years ago
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