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Volgvan
3 years ago
6

Which of the following is not an example of a chemical change? (hint:

Chemistry
1 answer:
Lena [83]3 years ago
3 0

Answer:

C. Boiling water

Explanation:

Boiling water is a physical change only; the H20 molecules are moving from a liquid state to a gas state and not turning into a new substance.

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A student prepares a weak acid solution by dissolving 0.2000 g HZ to give 100. mL solution. The titration requires 33.5 mL of 0.
nexus9112 [7]

Answer:

a)M=0.20/(0.335*0.1025)= 0.20/ 0.034 = 5.88 g/mol

b) if 0.100g is used instead of 0.200g

M = 0.1 / 0.034 = 2.94  hence the molar mass will be too low

Explanation:

0.2000 gHZ gives  100ml acid solution

33.5 ml of 0.1025 M NaOH  is required to prepare it

the moles = mass / molar mass

mass = 0.200 gHZ

moles = 0.0335*100 * 0.1025 = 0.034

therefore molar mass = mass / moles

                                  M=0.20/(0.335*0.1025)= 0.20/ 0.034 = 5.88

if 0.100g is used instead of 0.200g

M = 0.1 / 0.034 = 2.94  hence the molar mass will be too low

3 0
3 years ago
Coffee is decaffeinated industrially using supercritical (sc) CO2. One advantage to using scCO2 is that the polarity of the supe
koban [17]

Answer:

Yes

Explanation:

A supercritical fluid has good properties for both liquid and as for extraction properties, the advantages then include:

  • The fact that it has a lower viscosity than liquid CO2 allowing it to move through and around coffee beans more thoroughly with creating back pressure
  • Its density is comparable to that of liquid CO2 meaning there is much CO2 per litre as there is liquid form making it more efficient
  • It has a higher diffusivity than liquid CO2 which aids with penetration of the coffee beans on a molecular level

This experiment would not work with tea leaves because they also contain caffeine

6 0
3 years ago
What are the answers for this question<br> Don't just answer for points
Kisachek [45]

Answer:

i cant see it very much i dont think no one can

Explanation:

5 0
3 years ago
Read 2 more answers
Can anyone please help me!! What is d. Beat the eggs?? A physical or a chemical change?
Stells [14]

Answer:

physical change

Explanation:

im not 100% but thats what i would pick because all you are doing is changing the state they are in. the eggs arnt chemically changing at all. i think ur overthinking it

6 0
3 years ago
What are the limitations of using chemical indicators in determining the pH of a given solution?
tino4ka555 [31]

Answer:

1) chemical indicators won't work above it's pH range so therefore it probably won't change colour.

2) the solution should be clear and colourless to see colour change.

3) indicators tend to be of low accuracy so it's not 100% reliable.

5 0
3 years ago
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