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Leya [2.2K]
3 years ago
6

Question 1

Chemistry
1 answer:
Y_Kistochka [10]3 years ago
5 0
D. Radio waves


In order it would be Radio wave, Microwave, Infrared, visible, Ultraviolet, x-ray, Gamma ray
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What can you say about the past four decades?
Elis [28]
The temperature of the globe has been ever increasing over the past 4 decades. We have also seen the rise of deforestation and etc. However, we have also seen advances in scientific technology that solves many complications. A very increasing field would be genetic modification or crispr and biomedical. Technology is also ever advancing into shaping the way we use gadgets. Internet access is no longer considered a privilege but a necessities to drive the economies running and keeping the nation economically stable. Many nations are now also heavily investing in space technologies for expedition to planet mars for the search of living things. In the past decades, renowned cosmologist Stephen Hawking has released many publications relating to Black holes etc. He had also went to talk about the existence of aliens and extraterrestial lifeforms and how the world may come to the end because of aliens. This is not a exhaustive lists of the events happened over the past 4 decades but it gives you brief through about the many contributions that the scientific community has given. Thus, this is all.
5 0
3 years ago
Which of these has the most covalent character? <br> NaF <br> Caf2 <br> Bef2 <br> CsF <br> SrF2
VLD [36.1K]
Bef2 is the compound that has the most covalent character. Whichever element has the greatest electronegativity has the least difference and most covalent character. 
6 0
3 years ago
Read 2 more answers
"Inert" xenon actually forms many compounds, especially with highly electronegative fluorine. The ΔH° values for xenon difluorid
svp [43]

The average bond energy of the Xe¬F bonds in each fluoride is 132kJ/mol.

Given:

ΔH° of xenon difluoride (XeF2) = -105 kJ/mol

ΔH° of xenon tetrafluoride (XeF4)= -284 kJ/mol

ΔH° of xenon hexafluoride (XeF6) = -402 kJ/mol

The bond energy of Xe-F in XeF2 can be calculated as follows,

As we know that

ΔH° = ΔH°(bond formed) + ΔH°(bond broken)

The chemical reaction for the formation of XeF2 can be written in such a way,

Xe (g) + F2 (g) → XeF2 (g)

= [1 mol F2 (159 kJ/mol)] + [2(-Xe-F)] - 105 kJ/mol

= 159 kJ/mol + 2(-Xe-F) - 264 kJ/mol

= 2(-Xe-F)

Xe-F = 132 kJ/mol

Thus, we concluded that the average bond energy of the Xe¬F bonds in each fluoride is 132kJ/mol.

learn more about bond energy:

brainly.com/question/11653058

#SPJ4

3 0
1 year ago
The teacher in item 10 also needs to order plastic tubing. If each of the 60 students need 750 mm of tubing, what length of tubi
Alex777 [14]

45 m. If each student needs 750 mm of tubing, the teacher should order 45 m of tubing.

a) Find the <em>length in millimetres</em>

Length = 60 students x (750 mm tubing/1 student) = 45 000 mm tubing

b) Convert <em>millimetres to metres </em>

Length = 45 000 mm tubing x (1 m tubing/1000 mm tubing) = 45 m tubing

6 0
3 years ago
Which states of matter change shape when moved? Which states of matter change shape when moved?
lions [1.4K]

Answer:

Gas and Liquids

Explanation:

6 0
3 years ago
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