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Anna11 [10]
3 years ago
12

Which of the following changes could be associated with either a chemical change OR a physical change?

Chemistry
1 answer:
Pani-rosa [81]3 years ago
6 0

Answer:

A chemical change results from a chemical reaction, while a physical change is when matter changes forms but not chemical identity. Examples of chemical changes are burning, cooking, rusting, and rotting. Examples of physical changes are boiling, melting, freezing, and shredding.

Explanation:

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4. The concentration of both molecules in the starting mixture, prior to separation, is 1 mM. What is the amount (in mass units
viva [34]

Answer:

Hi there, the question here is not complete. Not to worry there will be in step by step guild in the explanation section that will help you in solving similar question.

Explanation:

So, an important information that should have been given in this question is the same of each of molecules in the mixture or even the name or identity of the mixture.

Nonetheless, the molarity if the mixture is given to be 1mM and the volume of the mixture is given to be 200L.

Therefore, the first thing to do is to determine the number of moles of each molecules in the mixture. After that the mad of each molecules can be determined using the number of moles gotten.

Thus, 1 mM = 0.001 M. Therefore, the number of moles of the molecules in the mixture can be calculated by using the formula below:

Number of moles = molarity × Volume = 0.001 × 200 = 0.2 mol.

Hence the mass of each Molecules can be calculated by using the formula below;

Number of moles = Mass/ molar mass.

That's mass = number of moles × molar mass of each molecules.

Assuming the molecules in the mixture are A and B and the respective molar mass of A and B are x g/mol and y g/mol. We will have;

The mass of A = 0.2 moles × x g/mol.

The mass of B = 0.2 moles × y g/mol.

5 0
3 years ago
If you reacted 183 grams of copper sulfate with excess iron, what mass of copper would you expect to make? You may need to balan
Nezavi [6.7K]

The question does not provide the equation

Answer:-

72.89 grams

Explanation:-

The balanced chemical equation for this reaction is

CuSO4 + Fe --> FeSO4 + Cu

Molecular weight of CuSO4 = 63.55 x 1 + 32 x 1 + 16 x 4

= 159.55 gram

Atomic weight of Cu = 63.55 gram.

According to the balanced chemical equation

1 CuSO4 gives 1 Cu

∴159.55 gram of CuSO4 would give 63.55 gram of Cu.

183 gram of CuSO4 would give 63.55 x 183 / 159.55

= 72.89 grams of Cu

7 0
4 years ago
A sample of gas at 25ºc has a volume of 11 l and exerts a pressure of 660 mm hg. how many moles of gas are in the sample?
san4es73 [151]
  The  moles of  the gas    in the sample  is 0.391  moles

    calculation
by use  of  ideal  gas  equation, that  is Pv=nRT
where  n  is number  of moles
           P(pressure)= 660  mmhg
           R(gas  constant)  =  62.364 l.mmhg/mol.K
           T(temperature)= 25 +273 =   298 k

by  making  n  the subject of the  formula

n= Pv/ RT

n is therefore=   (660mm hg  x11 L)/(  62.364 L.mmhg/mol.k  x298 K)  = 0.391  moles
5 0
4 years ago
How would you convert 5 decades to months
katen-ka-za [31]
First, find out how many years are in a decade. There 10 years per decade. So in 5 decades, that makes 50 years. Then multiply 50×12 because there are 12 months in a year. So there are 600 months in 5 decades.
3 0
3 years ago
Why is the Milky Way considered a galaxy
Lady_Fox [76]

Answer:

Explanation:

All the stars we see in the night sky are in our own Milky Way Galaxy. Our galaxy is called the Milky Way because it appears as a milky band of light in the sky when you see it in a really dark area.

3 0
3 years ago
Read 2 more answers
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