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german
3 years ago
7

Vhat are some of the benefits and drawbacks of recycling?​

Chemistry
1 answer:
Eva8 [605]3 years ago
5 0

Answer:

benefits: can help reduce waste in land fills, and promotes reusability (turned into different products)

drawbacks: can be much more expensive to salvage than to just throw it in a landfill, and most of the time products cannot be recycled effectively due to its material.

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What part of a circuit stops the current if it is open
eduard

Answer:

B is the correct answer

Explanation:

Just is

8 0
3 years ago
The process by which water vapor changes to liquid water is called
andre [41]
When water is turned into vapor (a gas), that is called evaporation.

Hope this helps. :)
6 0
3 years ago
State one alternative to burning fossil fuels in order to produce electricity? Please answer
Oksanka [162]

Answer:

Some well-known alternative fuels include bio-diesel, bio-alcohol (methanol, ethanol, butane), refuse-derived fuel, chemically stored electricity (batteries and fuel cells), hydrogen, non-fossil methane, non-fossil natural gas, vegetable oil, propane and other biomass sources

8 0
3 years ago
For many weak acid or weak base calculations, you can use a simplifying assumption to avoid solving quadratic equations. Classif
shtirl [24]

Answer:

a. not valid

b. valid

c. not valid

d. valid

e. not valid

Explanation:

The assumption to avoid solving the quadratic equation for the calculation of [H⁺] and [OH⁻] involved in the equilibria of weak acids and bases ( small Ka and Kb) is valid as long as the value obtained from the shortcut is less than 5 % or less of the original acid or base concentration.

For a general monoprotic acid, as in this question, the equlibria is:

HA  +             H₂O       ⇄   H₃O⁺ + A⁻      Ka = [H₃O⁺][A⁻]/[HA]

To determine the concentrations at equilibrium we are going to setupup the ICE table:

                     [HA]             [H₃O]          [A⁻]

Initial            [HA]₀                0                 0

Change           - x                 +x               +x

Equil            [HA]₀ - x             x                 x

Ka = x² /  [HA]₀ - x  

Here is where we make our simplification of approximating   [HA]₀ - x  to the original acid concentration,  [HA]₀,  assuming x is much less than  [HA] since HA is a weak acid.

To answer our questions we will solve for x,and then  can compare it to the initial HA concentration.

Lets now perform our calculations.

(a)   x = √ (0.01 x 1x 10⁻⁴) = 1 x 10⁻³ M = [H₃O⁺]

% =  1 x 10⁻³/.01 x 100  = 10%

The assumption is not valid.

(b)  x = √ (0.01 x 1x 10⁻⁵) = 3.2 x 10⁻⁴ M = [H₃O⁺]

% = 3.2 x 10⁻⁴ /0.01 x 100 = 3.2 %

The assumption is valid since the criteria of 5 % or less has been met.

(c) x = √ (0.1 x 1x 10⁻³) = 1.0 x 10⁻² M = [H₃O⁺]

% =  1.0 x 10⁻² /0.1  x 100 = 10 %

The assumption is not valid, we wiould have to solve the quadratic equation.

(d)   x = √ (1 x 1x 10⁻³) = 3.2 x 10⁻² M = [H₃O⁺]

% = 3.2 x 10⁻² / 1 x 100 = 3.2

The assumption is valid.

(e)   x = √ (0.001 x 1x 10⁻⁵) =1.0 x 10⁻⁴ M = [H₃O⁺]

% = 1.0 x 10⁻⁴ / .001 = 10 %

The assumption is not valid and one has to solve the quadratic equation.

7 0
3 years ago
What does a concentration gradient do to etc?
FrozenT [24]
<span>Concentration of a chemical in a solution refers to how many of the chemical's molecules are sitting in a small volume of the solution. Concentration could be measured in molecules per liter, although molecules are so small compared to a liter that we usually use different units (just like we wouldn't want to measure the distance between the earth and the sun in inches). A gradient is a measurement of how much something changes as you move from one region to another. So a concentration gradient is a measurement of how the concentration of something changes from one place to another.

If this doesn't help here's a Khan Academy video </span><span>https://www.khanacademy.org/...and.../concentration-gradients</span>
5 0
3 years ago
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