CHEMISTRY HIGH SCHOOL

Ayala is making salad dressing. She mixes oil and vinegar in a blender until a smooth consistency is formed. Explain whether this is a heterogeneous or a homogeneous mixture and why.

Answers

Answer 1
Answer:

Answer: The mixture formed will be heterogeneous mixture.

Explanation: When we mix oil and vinegar and blend it together to form a smooth mixture, the final mixture will still be heterogeneous in nature.

As we know that vinegar is a solution of acetic acid in water, which is polar in nature and oil is non-polar in nature.

When, we mix polar compound with a non-polar one, the resulting mixture may mix for a certain time, but after a time, we will be able to see the two layers in a mixture.

And heterogeneous mixtures are defined as the mixtures in which there is a distinct physical boundary present between the solutions in a mixture.

Hence, the mixture of oil and vinegar is a heterogeneous mixture.
Answer 2
Answer:

Sample Response: A homogeneous mixture can only form when one of the substances can dissolve the other one. Oil and water cannot dissolve each other, so they must form a heterogeneous mixture with small particles of vinegar dispersed throughout the oil, yet not dissolved.

Explanation: Hope this Helps!

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Dalton hypothesized that atoms are indivisible and that all atoms of an element are identical. It is now known that _____. A. all of Dalton's hypotheses are correct
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D. all atoms of an element are not identical but they must all have the same mass

Answers

Dalton hypothesized that atoms are indivisible and that all atoms of an element are identical. It is now known that atoms are divisible. The answer is letter C

Lakshmi has a sample of ammonium nitrate (NH4NO3) that has a mass of 40.10 g. She knows that the molar mass of NH4NO3 is 80.0432 g/mol. To the correct number of significant digits, how many moles of NH4NO3 does the sample contain?

Answers

The correct number of significant digits and moles of NH4NO is 0.500979 mol.

The molar mass is the mass of 1 mole of the substance.

  • Ammonium nitrate, (NH4NO3), a salt of ammonia and nitric acid, is used widely in fertilizers and explosives. The commercial-grade contains about 33.5 percent nitrogen, all of which is in forms utilizable by plants; it is the most common nitrogenous component of artificial fertilizers.
  • If the molar mass of nh4no3 is 80.0432 g/mol, that means there are 80.0432 g of substance in 1 mole. The question is how many moles is 40.10 g of substance.

80.0432 g : 1 mol = 40.10 g : x mol

By crossing the products:

Therefore:

x · 80.0432 g = 1 mol · 40.10 g

⇒ x = 40.10 ÷ 80.0432 mol

The correct number of significant digits and moles of NH4NO is 0.500979 mol.

Learn more about  ammonium nitrate

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Lakshmi has a sample of ammonium nitrate (NH4NO3) that has a mass of 40.10 g. She knows that the molar mass of NH4NO3 is 80.0432 g/mol. Divide 40.10 grams to 80.0432 g/mol and you will get 0.5010 moles.

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?

Answers

  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

Find the mistake C2H4(g) + 2O2(g) → 2CO2(g) + 2H2(g)

Answers

this equation is a combustion reaction. a combustion reaction must have carbon dioxide and water as products.

yours only had carbon dioxide and no h2o

therefore it is wrong

Alkali metals react with water to produces what product?

Answers

Answer:

  • Alkali metals react with water to produce hydroxide and hydrogen gas.

Explanation:

That is a chemical property of alkali metals: they are highly reactive and react vigorously with water to produce the correspondant hydroxide and hydrogen gas.

These are some of those reactions:

  • 2Li (s) + 2H₂O (l)  → 2LiOH (aq) + H₂(g) ↑

  • 2Na (s) + 2H₂O (l)  → 2NaOH (aq) + H₂(g) ↑

  • 2K (s) + 2H₂O (l)  → 2KOH (aq) + H₂(g) ↑

The alkali metals are the elements of group 1 of the periodic table: Li, Na, K, Rb, Cs, and Fr. They have one valence electron which may lose easily to form an ion with charge +1.

Final answer:

Alkali metals react with water to produce hydrogen gas and a basic solution of the metal hydroxide (for instance, sodium hydroxide when lithium is in the reaction). This reaction signifies the easier oxidation of alkali metals compared to hydrogen.

Explanation:

When alkali metals react with water, they form hydrogen gas and a basic solution of the metal hydroxide. This vigorous reaction reveals that alkali metals are easier to oxidize than is hydrogen. For instance, considering the reaction of lithium with water:

2Li(s) + 2H₂O(l) --> 2NaOH(aq) + H₂(g)

The solid state (s) lithium reacts with liquid water to generate hydrogen gas and the ionic compound sodium hydroxide. This sodium hydroxide, which is a solid in its pure form, promptly dissolves in water.

The same kind of reaction occurs with other alkali metals and also some alkaline earth metals, although beryllium and magnesium are exceptions.

Learn more about Reaction of Alkali Metals with Water here:

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Increasing the ? of a solvent increases the solubility of the solute

Answers

There are a lot of ways to increase the solubility of the solute. Increasing the temperature, mixing time and surface area of a solvent increases the solubility of the solute

The answer is temperature
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