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ser-zykov [4K]
3 years ago
9

Question 18

Chemistry
1 answer:
zubka84 [21]3 years ago
5 0

Answer:

B

Explanation:

Flammability is a physical property of sodium

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What are two different types of electron microscopes and how might their ability to observe a specimen he different?
Sunny_sXe [5.5K]

Answer:

transmission EM (TEM) and the scanning EM (SEM)

Explanation:

Electron microscopy (EM) is a technique for obtaining high resolution images of biological and non-biological samples. It is used in biomedical research to examine the detailed structure of tissues, cells, organs and gross cell bodies.

There are two main type of electron microscope

  1. the transmission EM (TEM)
  2. the scanning EM (SEM)
  • Transmission electron microscopes are used to see thin specimens so that electrons can produce a projection image. TEM can be adapted in many ways to conventional (compound) light microscopes.
  • TEM is used for the internalization of cells , the formation of protein molecules, viruses, and organization of molecules in the cytoskeletal filaments. And arrangement of protein molecules in cell membranes.
4 0
3 years ago
Determine the mass of 1 mol of gold (Au), of aluminum chloride (AlCl3), and of glucose (C6H12O6)
sleet_krkn [62]

Answer: Mass of 1 mol of gold (Au) is 197g , of aluminum chloride(AlCl_3) is 133.5 g and of glucose (C_6H_{12}O_6) is 180 g

Explanation:  Mass of 1 mole of a substance is called its molar mass.

a) 1 mole of Au contains 6.023\times 10^{23}atoms and weigh 197g.

b) 1 mole of AlCl_3 will weigh=1\times {\text {mass of 1 mole of Aluminium}}+3\times {\text {mass of 1 mole of chlorine atom}}

Thus mass of 1 mole of AlCl_3 will be =1moles\times {27g/mol}+3moles\times {35.5g/mol}=133.5g

c) 1 mole of C_6H_{12}O_6 will weigh=6\times {\text {mass of 1 mole of carbon}}+12\times {\text {mass of 1 mole of hydrogen atom}}+6\times {\text {mass of 1 mole of oxygen}}

1 mole of C_6H_{12}O_6 will weigh=6\times 12g/mol+12\times 1g/mol+6\times 16g/mol=180g


5 0
4 years ago
Group 1, period 7 element
Serhud [2]

Answer:

Period 7 element

Hydrogen  

Lithium Beryllium Fluorine

Sodium Magnesium Chlorine

Potassium Calcium Bromine

Rubidium Strontium Iodine

Explanation:

8 0
4 years ago
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Does a precipitate form when a solution of sodium acetate and a solution of ammonium sulfate are mixed together?
e-lub [12.9K]
<h3><u>Answer</u>;</h3>

No, a precipitate does not form

<h3><u>Explanation</u>;</h3>
  • Precipitation involves mixing or combining solutions that contain soluble ionic compounds to form an insoluble ionic compound by a reaction.
  • Sodium acetate and ammonium sulfate are both soluble ionic compounds, which implies that they exist as ions in aqueous solution.
  • <em><u>When they combine they form NH4CH3COOH and sodium sulfate, Na2SO4, which are both soluble salts, as all salts of ammonium and sodium are soluble.</u></em>
  • <em><u>Both ammonium acetate and sodium sulfate are soluble because there are no anions that can form an insoluble solid with NH4+ and Na+ cations. </u></em>
5 0
3 years ago
What did you know for sure after one Test? Two tests? Three tests?
Lorico [155]

Answer:

I knew that I learned something and passed that test. And that is all I want to do.

Explanation:

6 0
3 years ago
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