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2 years ago

Define ""green chemistry"" and ""ecological footprints"".

Chemistry

1 answer:

Effectus [21]2 years ago

5 0

Explanation:

Green chemistry

It is the process of designing a chemical compound via reducing or eliminating the use or generation of the hazardous substances .

It is a eco - friendly method , which does not harm the nature .

Ecological footprints

It is the tool to measure the demand of humans on nature , the quantity of nature humans require to support economy .

It tracks the demand of the humans via ecological accounting system .

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What would be a simple way to block erosion

Travka [436]

By applying some (compared to other things) simple steps, you can control and prevent soilwearing away! The four most common soil wearing away prevention methods are green plants, geotextiles, mulch, and (big walls to hold back water, soil, etc.). Green plants: The simplest andmost natural way to prevent wearing away is through planting green plants.

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2 years ago

Points) Determine the molar mass of NaCl (the solute) in a 0.1M aqueous solution of NaCl

nalin [4]

Answer:

58.443 g/mol

Explanation:

The molar mass of NaCl is the sum of the molar masses of the individual atoms:

Na: 22.989770 g/mol

Cl: 35.453 g/mol

The total molar mass is ...

NaCl: 58.443 g/mol

The molar mass does not depend on whether the material is in solution or in any other form.

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3 years ago

A lead–tin alloy of composition 30 wt% Sn–70 wt% Pb is slowly heated from a temperature of 150°C (300°F).(a) At what temperature

Novay_Z [31]

Answer:

a) 231.9 °C

b) 100% Sn

c) 327.5 °C

d) 100% Pb

Explanation:

This is a mixture of two solids with different fusion point:

$Tf_{Pb}=327.5 C$

$Tf_{Sn}=231.9 C$

Given that Sn has a lower fusion temperature it will start to melt first at that temperature.

So the first liquid phase forms at 231.9 °C and because Pb starts melting at a higher temperature, that phase's composition will be 100% Sn.

The mixture will be completely melted when you are a the higher melting temperature of all components (in this case Pb), so it will all in liquid phase at 327.5 °C.

At that temperature all Sn was already in liquid state and, therefore, the last solid's composition will be 100% Pb.

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3 years ago

For which of the following activities might you want to hire a chemist?

yarga [219]

examining the structure of plant cells

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3 years ago

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Klio2033 [76]

Answer:

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Explanation:

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3 years ago

Read 2 more answers