1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Anna [14]
3 years ago
7

Why is pure silicon a poor conductor at room temperature?

Chemistry
1 answer:
Alex3 years ago
6 0
The appropriate answer is a. it's valence electrons are held tightly within the crystal structure. Metals are good conductors because they share electrons and so they are free to move about enabling it to be a good conductor. Any substance that has electrons tightly held within bonds will not be good conductors. If the structure of pure silicon had its valence electrons held loosely by a positive nucleus then it would be able to conduct.
You might be interested in
Particle with more energy move _________ than particles with less energy.
s2008m [1.1K]
Faster and farther apart
5 0
3 years ago
Read 2 more answers
Hawaii, which sits over a hot spot located near the center of the Pacific
Gnoma [55]

Answer:

Shield Volcano . I've been their before

Explanation:

4 0
2 years ago
How many atoms of hydrogen are present in 7.63 g of ammonia? please help me ??
GarryVolchara [31]
The atoms  of  hydrogen  that are  present  in  7.63 g  of ammonia(NH3)

find  the  moles  of NH3 =mass/molar mass
 7.63 g/ 17 g/mol = 0.449  moles

since there  is  3 atoms of H  in NH3 the  moles of  H = 0.449 x 3 = 1.347 moles

by  use  of  1 mole = 6.02 x10^23  atoms
what  about  1.347  moles

= 1.347  moles/1   moles  x 6.02 x10^23 atoms = 8.11 x10^23  atoms of Hydrogen
3 0
3 years ago
scandium47 has a half-life of 35s. suppose you have a 45g sample of scadium 47 how much of the sample remains unchanged after 14
Mars2501 [29]

 The much  of the sample that would remain  unchanged  after 140 seconds is 2.813 g

Explanation

Half life  is time taken for the quantity  to reduce  to half its original value.

if the half life  for Scandium  is 35 sec, then the number  of half life in 140 seconds

=140 sec/ 35 s = 4 half life

Therefore 45 g after first half life = 45 x1/2 =22.5 g

               22.5 g after second half life = 22.5 x 1/2 =11.25 g

            11.25 g after third half life = 11.25 x 1/2 = 5.625 g

             5.625 after  fourth half life = 5.625 x 1/2 = 2.813

therefore 2.813 g  of Scandium 47 remains  unchanged.

4 0
3 years ago
Explain how an ionic compound forms from these elements.
grin007 [14]

Ionic compounds are formed by the complete transfer of electrons from more electronegative elements to less electronegative elements.

7. <u>Sodium Nitride (Na₃N)</u> is an ionic substance.

8. The ionic formula for <u>Lithium Oxide is Li₂O</u>

9. The <u>compound SrF₂</u>

10. Aluminum Sulfide is a chemical compound with the <u>formula Al₂S₃.</u>

An ionic compound is a chemical compound composed of ions held together via electrostatic forces termed ionic bonding. The compound is neutral standard but includes definitely charged ions known as cations and negatively charged ions known as anions.

An ionic compound is a chemical compound composed of ions held collectively by means of electrostatic forces termed ionic bonding. The compound is neutral normal however consists of positively charged ions known as cations and negatively charged ions referred to as anions. Ionic compounds incorporate ions and are held collectively via the attractive forces of most of the oppositely charged ions.

Learn more about ionic compounds here:-

#SPJ1

8 0
1 year ago
Other questions:
  • Which of these phrases accurately describe disproportionation? Check all that apply. A single compound reacts with itself. A sin
    11·2 answers
  • Write a balanced equation for the complete combustion of pentane, c5h12. do not enter phase symbols. enter the alkane formula as
    14·1 answer
  • The blackbody curve for a star named Beta is shown below. What is the peak wavelength for this star?
    10·2 answers
  • How many moles of naf are in 34.2 grams of a 45.5% by mass naf solution?
    7·1 answer
  • Describe what the greenhouse effect is and how it is caused on a molecular level.
    14·1 answer
  • Ac sample of octane that has a mass of 0.750 g is burned in a bone calorimeter. As a result, the temperature if the calorimeter
    10·2 answers
  • Which of the variables listed (arm length and amplitude) above do you predict will affect the pendulum’s period? How do you thin
    15·1 answer
  • What is the bond formation of N and H
    10·2 answers
  • Which of the following is equal to Avogadro's number?​
    6·1 answer
  • Please help me i need this asp
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!