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Vikentia [17]
3 years ago
7

Some people argue that a policy of putting out wildfires is having a negative long-term effect on the number and strength of wil

dfires. Suggest why this could be the case.
Chemistry
1 answer:
murzikaleks [220]3 years ago
4 0

Answer:

The reason for this is that putting out the fires only postpones the fire outbreak to a later date, and there is the fear of the fire outbreak being more sever when it actually comes.

When wildfires burn, they clean up the forest off dead trees and falling logs. Also dried leaves and twigs and unnecessarily dense vegetation is cleared up by the fire. These materials are the main fuel of these wildfires. Putting out these fires, especially those that start naturally means that these fuel that should be cleaned up are allowed to accumulate so that when the fire actually happens, it does so with an unnatural intensity. Also, when fire burns, the ashes that are left act as nutrition for the forest, and the forest is allowed to regrow; reborn from the ashes. The only cases that might need human intervention is when the fire is human caused or due to human activities. Natural causes of fire can be due to a very high temperature, lightning striking a tree, etc.

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Calculate the fraction of empty space in cubic closest packing to five significant figures.
nata0808 [166]

0.259 52 . The fraction of empty space in a ccp cell is 0.259 52

Cubic closest packing is another name for <em>face centred cubic</em>.

Refer to the attached diagram of an fcc unit cell from <em>hemantmore</em>.

<h2>a) <em>Volume of atoms in unit cell </em></h2>

a. <em>Number of atoms in unit cell </em>

In an fcc lattice, there are eight atoms at the eight corners of the cube and one at the centre of each face

∴ No. of atoms

= 8 corners x (1/8 atom)/(1 corner) + 6 faces x (½ atom/1 face)

= 1 atom + 3 atoms = 4 atoms

b. <em>Volume of atoms </em>

Let <em>r</em> be the radius of an atom. Then

Volume of 1 atom = (4/3)π<em>r</em>^3

Total volume of atoms = 4 atoms × [(4/3)π<em>r</em>^3]/(1 atom) = (16/3)π<em>r</em>^3

<h2>b) <em>Volume of unit cell </em></h2>

The length of the diagonal AB is

AB = 4<em>r</em>

Let <em>a</em> be the edge length of the cube.

AB^2 = AC^^2 + BC^2

(4<em>r</em>)^2 = <em>a</em>^2 + <em>a</em>^2

16<em>r</em>^2= 2<em>a</em>^2

<em>a</em>^2 = 8<em>r</em>^2

<em>a</em> = <em>r</em>x8^½

<em>V</em> = <em>a</em>^3 = (<em>r</em>x8^½)^3 = 8<em>r</em>^3x8^½

<h2>c) <em>Fraction of occupied space</em> (packing efficiency, PE) </h2>

PE = Volume of atoms/Volume of cell = [(16/3)π<em>r</em>^3]/[ 8<em>r</em>^3x8^½]

= 2π/(3x8^½)

<h2>d) <em>Fraction of empty space </em></h2>

Fraction of empty space = 1 - PE = 1 - 2π/(3x8^½) = 1 – 0.740 480

= 0.259 52

4 0
4 years ago
Chemical equilibrium is reached when _____. hints chemical equilibrium is reached when _____. all of the reactants are converted
Aleonysh [2.5K]
Chemical equilibrium is a condition where the rate of product made is same as the rate of reactant made. Since the reaction to the left is same as the reaction to the right, so the amount of reactant and product will not be changed (doesn't mean that the amount is same, it just won't increase or decrease).
It's called equilibrium since there will be no change in their amount.
7 0
3 years ago
Use the periodic table to match each of the following element symbols to its name, atomic mass, or atomic number. Match Term Def
Nataly [62]

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element               symbol              atomic mass  or atomic  number

Antimony                Sb                         51

 sulfur                     S                            32

 Silicon                    Si                           14


<u><em>Explanation</em></u>

 From periodic table Antimony   is a chemical   element with  symbol Sb   and atomic number 51.

 Sulfur  on the  other hand  is a  chemical  element  with  symbol  S  and  has  a atomic  mass  of 32


silicon  is an element  with symbol Si    and  atomic number 14

5 0
4 years ago
Read 2 more answers
A set of orbital for which the quantum number l=2 is
Kobotan [32]

Answer:

The second quantum number, known as the angular or orbital quantum number, describes the subshell and gives the magnitude of the orbital angular momentum through the relation. In chemistry and spectroscopy, ℓ = 0 is called an s orbital, ℓ = 1 a p orbital, ℓ = 2 a d orbital, and ℓ = 3 an f orbital.

5 0
3 years ago
you turn on a lamp.The amount of light energy released by the light bulb is less than the amount of electrical energy that flows
valentinak56 [21]
A) some energy is converted to heat

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