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
Marizza181 [45]
3 years ago
8

A sample of silicon rejected for use in an electronic circuit has an impurity of boron at a level of 3 parts per trillion. What

is the fraction of boron atoms in the silicon sample as written in scientific notation? In equation form 3 parts per trillion is written as 3/10^12 A) 3 x 10-12 B) 3 x 106 C) 3×10-9 D) 3 x 109

Chemistry
2 answers:
uysha [10]3 years ago
7 0

Explanation:

Below is an attachment containing the solution.

Law Incorporation [45]3 years ago
6 0

Answer:

A. 3 x 10-12

Explanation:

Generally, the parts-per notation is used to represent very small concentration without any specific unit.

Parts per million is notated as 10^{-6}

Parts per billion is notated as 10^{-9}

Parts per trillion is notated as 10^{-12}

Hence, 3 parts per trillion will be written as 3 x 10^{-12}

The correct option is A.

You might be interested in
A mixture of propane and butane is burned with pure oxygen. The combustion products contain 46.7 mole% H2O. After all the water
wlad13 [49]

Answer:

28%

Explanation:

Basically, all o did was write the equations, balance it and solve for them. Also, at the place I stared, I used simultaneous equation to solve it. Multiplying by 8 and also 3.

It's a pretty straightforward question.

At the final step that's missing, I Did

(y)C3H8 = 2.8 / ( 2.8 + 7.1)

(y)C3H8 = 0.28

5 0
3 years ago
Compare and contrast alpha beta and gamma radiation
Evgen [1.6K]
There are usually 3 topics used to compare types of radiation: 

Ionising ability
Penetrative power 
Range in air

Ionising ability
Alpha radiation has strong ionising ability, while beta only has moderate ionisation and gamma is very weakly ionising.

Penetrative power 
Alpha particles are weakly penetrating, stopped by paper, while beta particles have stronger penetrating ability, stopped by skin and gamma radiation is very strongly penetrating, stopped only by thick layers of lead.

Range in air
Alpha particles- range of only a few centimetres
Beta - range of up to one meter 
Gamma- infinite range in air.

Hope this helps:)


8 0
3 years ago
What kind of chemical reaction does the chemical equation sodium + chlorine → sodium chloride represent?
Vinil7 [7]
D. Synthesis cause A + B --> AB Equation: 2Na + Cl2 --> 2NaCl
7 0
3 years ago
Read 2 more answers
Complete the nuclear equation<br><br> 42 K → 0 e <br>19____-1
kenny6666 [7]

Answer:

42 19 K→42 20 Ca+e−

Explanation:

Naturally-occurring potassium atoms have a weighted average atomic mass of 39.10 (as seen on most modern versions of the periodic table.) Each potassium atom contains 19 protons p+ and thus an average potassium atom contains about 39.10−19≈20 neutrons n0.

This particular isotope of potassium-42 contains 42 nucleons (i.e., protons and neutrons, combined;) Like other isotopes of potassium 19 out of these nucleons are protons; the rest 42−19=23 are therefore neutrons.

5 0
3 years ago
Match each of the three descriptions of a volume to the appropriate metric unit of volume
tankabanditka [31]
A.) 1.
b.) 3
c.) 2
I hope this helps.
8 0
3 years ago
Other questions:
  • What is the half-life of sodium-25 if 1.00 gram of a 16.00-gram sample of sodium-25 remains unchanged after 237 seconds?
    10·1 answer
  • We call the elements in the blocks of periods 4-7 and groups 3-12 the
    13·1 answer
  • What is the colour of feso4.7h2o crystals
    15·1 answer
  • List 4 factors that suggest a chemical reaction has taken place
    5·1 answer
  • can someone please help me with these questions? predicting products and balancing the equations of single replacement​
    5·1 answer
  • What is the density of a substance with a mass of 1.8 kg and a volume of 0.2 L?
    10·1 answer
  • What mass of oxygen reacts with 3.6 g of magnesium to form magnesium oxide?
    12·1 answer
  • What is the chemical name for OBr2?
    10·1 answer
  • Is this anwser correct
    10·2 answers
  • Fizzing or foaming is evidence that a chemical change may have occured
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!