CHEMISTRY MIDDLE SCHOOL

Scientific discoveries are rarely used in technology.


True or False

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How does biodiversity help sustain a population in an area

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Having a variety is always good you never want to have too much of one thing. It helps with the food chain its basically survival of the fittest 

How to separate a mixture of suger, water and sand

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I believe the answer you’re looking for is Using distillation

Mendel identified a combination of "factors" inherited from each parent called a ????​

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Mendel discovered the fundamental laws of inheritance. He deduced that genes come in pairs and are inherited as distinct units, one from each parent. Mendel tracked the segregation of parental genes and their appearance in the offspring as dominant or recessive traits. The “factors” are genes.

Does lead rust? help

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No it doesn't lead oxidizes 
Lead oxidizes.
no
Nope, cant rust as lead like copper /brass /bronze /muntz metals are non ferrous thus NO rusting is possible 
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When salt dissolves in water, which is the solvent

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a solvent is what is doing the dissolving. so in this case the water would be your solvent because it is dissolving the salt. does that make sense?

A 3.90L sample of gas at STP is cooled to -55oC at 808mmHg. What is the new volume?

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Answer:

3.72L

Explanation:

Given parameters:

Initial volume V₁ = 3.9L

Condition  = STP

Final temperature T₂ = -550°C

Final pressure P₂  = 880mmHg

Unknown:

Final volume V₂  = ?

Solution.

At standard temperature and pressure(STP), the:

           Pressure  = 1atm   = 760mmHg

            Temperature  = 273K

Therefore, P₁  = 760mmHg

                  T₁  = 273K

The general gas law, is best to solve this problem. It is mathematically given as:

           (P_(1) V_(1) )/(T_(1) ) = (P_(2) V_(2) )/(T_(2) )

Let us take the units to the appropriate one;

      -550°C  = 273 + (-550) = -277K

Input the variables;

             (760 x 3.9)/(273) = (808 x V_(2) )/(-277)

        V₂  = 3.72L

           
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