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valkas [14]
4 years ago
4

Which statement about covalent compounds is true? They are able to melt at high temperatures. They are poor conductors of heat.

They have strong intermolecular attractions. They have atomic bonds that are easy to break.
Chemistry
2 answers:
DanielleElmas [232]4 years ago
8 0

The correct option is this: THEY ARE POOR CONDUCTOR OF HEAT.

Covalent compounds are those compounds that are formed by sharing of paired electrons. Elements that formed covalent compounds are usually non metals, which are poor conductors of heat and electricity. These compounds are unable to conduct electricity because their constituent particles are molecules and not charged particles [cations and anions], which can conduct heat and electricity. Generally, covalent compounds have melting and boiling points and they are typically brittle in nature.

yuradex [85]4 years ago
5 0
The answer is B. They don't conduct heat at all
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Calculate the ratio of the velocity of helium atoms to the velocity of neon atoms at the same temperature.
o-na [289]

Answer:

vHe / vNe = 2.24

Explanation:

To obtain the velocity of an ideal gas you must use the formula:

v = √3RT / √M

Where R is gas constant (8.314 kgm²/s²molK); T is temperature and M is molar mass of the gas (4x10⁻³kg/mol for helium and 20,18x10⁻³ kg/mol for neon). Thus:

vHe = √3×8.314 kgm²/s²molK×T / √4x10⁻³kg/mol

vNe = √3×8.314 kgm²/s²molK×T / √20.18x10⁻³kg/mol

The ratio is:

vHe / vNe = √3×8.314 kgm²/s²molK×T / √4x10⁻³kg/mol / √3×8.314 kgm²/s²molK×T / √20.18x10⁻³kg/mol

vHe / vNe = √20.18x10⁻³kg/mol / √4x10⁻³kg/mol

<em>vHe / vNe = 2.24</em>

<em />

I hope it helps!

8 0
3 years ago
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
Answer this please thank you
Zigmanuir [339]

Answer:

Explanation:

D is the correct answer

7 0
3 years ago
Use the naming conventions to complete the following formula-name pairs of binary acids. Match the acid names and chemical formu
ohaa [14]

Answer:

This looks like a hard question for me is this biology

Explanation:

6 0
3 years ago
What volume of a 6.67 M NaCl solution contains 3.12 mol NaCl? L
harkovskaia [24]

Answer:

0.47dm³

Explanation

Given parameters :

Molarity of NaCl = 6.67M

Number of moles = 3.12mol

Volume of NaCl =?

Volume of NaCl = number of moles/Molarity

Volume of NaCl = 3.12mol/6.67M

Volume of NaCl = 0.47dm³

4 0
4 years ago
Read 2 more answers
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