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katrin [286]
3 years ago
5

Coal and diamond are both minerals .they are both expensive.why

Chemistry
2 answers:
Liula [17]3 years ago
4 0

Answer:

hard to find

Explanation:

Alex17521 [72]3 years ago
4 0

Answer:

because actually diamonds is coal.

Explanation:

how diamonds is coal? because when the coal gets very high pressure it turns into diamonds.

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A 2.5% (by mass) solution concentration signifies that there is of solute in every 100 g of solution. 2. therefore, when 2.5% is
densk [106]
Answer #1 is "there is 2.5 grams of solute in every 100 g of solution." 
We calculate for 2.5% by mass solution by dividing the mass of the solute by the mass of the solution and then multiply by 100.
Answer #2 is "that mass ratio would be 2.5/100 or 2.5 grams of solute/100 grams of solution." 
We weigh out 2.5 grams of solute and then add 97.5 grams of solvent to make a total of 100 gram solution, that is,
     mass of solute / mass of solution = 2.5g solute / (2.5g solute + 97.5g solvent)
                                                          = 2.5g solute / 100g solution
Answer#3 is "a solution mass of 1 kg is 10 times greater than 100 g, thus one kilogram (1 kg) of a 2.5% ki solution would contain 25 grams of ki."
We multiply 10 to each mass so that 100 grams becomes 1000grams since 1000 grams is equal to 1 kg:
     mass of solute / mass of solution = 2.5g*10/[(2.5g*10) + (97.5g*10)]
                                                          = 25g solute/(25g solute + 975g solvent)
                                                          = 25g solute/1000g solution
                                                          = 25g solute/1kg solution
5 0
3 years ago
Read 2 more answers
BRAINLIESTT ASAP! PLEASE HELP ME :)
ruslelena [56]

Answer:

See below  

Step-by-step explanation:

Matter is either a <em>pure substance</em> or a <em>mixture. </em>

Pure substances

  • Are composed of one type of atom or molecule.
  • Have a constant chemical composition
  • Have fixed chemical properties
  • Have fixed physical properties

              • For example, melting point, boiling point, density, solubility

Mixtures:

  • Consist of two or more substances not chemically combined
  • Have a variable composition
  • Can be separated into two or more components by physical means

             • For example, filtration, distillation, centrifugation

  • Each component retains its own properties
7 0
3 years ago
1<br> According to the text, what is reduction?
spayn [35]
You forgot to attach the text

BTW reduction is the action or fact of making a specified thing smaller or less in amount, degree, or size.
8 0
3 years ago
When the process of condensation occurs, the kinetic energy of particles
hammer [34]

Answer:

A. is insufficient to overcome intermolecular forces

Explanation:

Just took the review

5 0
3 years ago
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Why don't animal cells need chloroplasts?
WINSTONCH [101]

Answer:

A. animals do not make their own food.

Explanation:

5 0
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