CHEMISTRY HIGH SCHOOL

Which is a mixture?potassium metal

chlorine gas

potassium chloride

potassium and chlorine

Answers

Answer 1
Answer:

Answer : The correct option is potassium and chlorine.

Explanation :

Mixture : It is a substance which is made by the combination of two or more things in such a way there is no chemical reaction occurs.

For example : Sand and water, oil and water, milk and chocolate, etc.

  • Potassium is a metal.
  • Chlorine is a gas.
  • Potassium chloride is a compound.
  • Potassium and chlorine is a mixture.
Answer 2
Answer: A mixture is potassium and chlorine. A mixture is a combination of pure substances that have no definite composition. It may be either a homogenous or heterogeneous. 

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Which of the following might be an indicator of global warming?A. average increase in the temperatures near Earth's surface
B. a decrease in greenhouse gases
C. average decrease in the temperatures near Earth's surface
D. a decrease in carbon dioxide emissions

Answers

Answer: The correct answer is A. average increase in the temperatures near Earth's surface

Explanation: The reason this is correct is that global warming is it getting hotter, logically the temperatures near Earth's surface will be getting hotter as well. Hope this helps

Lysine is used as a topical medicinal skin creme. what is the molecular formula of lysine if the empirical formula is c3h7no, and the approximate molar mass is 146 g/mol

Answers

Molecular Formula is calculated using following formula,

Molecular Formula  =  n (Empirical Formula)     ----- (1)

Calculating n;

                      n  =  Molecular Weight / Empirical Formula Weight  --- (2)

Empirical formula weight = (12×3) + (1×7) + (14×1) + (16×1)

Empirical formula weight = (36) + (7) + (14) + (16)

Empirical formula weight = 73

Putting values in Eq. 2,

                                n  =  146 / 73

                                n  =  2

Putting Value of n and Empirical Formula in Eq. 1,

Molecular Formula  =  2 × C₃H₇NO

Molecular Formula  =  C₆H₁₄N₂O₂

Result:
           Molecular Formula of Lysine is C₆H₁₄N₂O₂.

How many moles of atoms are in 2.00 g of 13c?

Answers

There are 0.154 moles of atoms in 2.00 g of carbon-13.

Further Explanation:

Moles, Atomic mass and Molecular mass  

  • 1 mole of a pure substance contains a mass that is equal to the relative atomic mass or molecular mass of the substance.
  • Therefore; molar mass is given as grams per mole of a substance  

Hence;

Molar mass = mass of a substance/ Number of moles  

     g/mol = g /mole  

Thus;

  • M = m/n; where M is the molar mass, m is the mass and n is the number of moles
  • From this relationship we can therefore, calculate mass by multiplying the number of moles by molar mass of a substance.

That is; Mass = moles x molar mass  

  • To calculate number of moles;

We have; n = m/M

Number of moles = Mass of the substance/ Molar mass

  • In our case;

Mass = 2 g of Carbon-13  

Molar mass = 13.0 g/mol  

Since; Number of moles = Mass/ molar mass

Thus;

Moles = (2.0 g)/ (13.0 g/mol)

          = 0.154 moles  

Keywords: Moles, Molecular mass, relative atomic mass  

Learn more about:

Level: High school  

Subject: Chemistry  

Topic: Moles  

Sub-topic: Moles, molecular mass and mass of a pure substance.

You have 10 fish,5 drowned,3 came back to many fish do you have now?

Answers