How many moles of water, H2O, contain 2.0×1022 molecules of water? (See the hints for assistance in interpreting scientific notation.)Express the quantity in moles to two significant figures.

Answers

Answer 1

Answer: In this question, what are we really being asked? We are being asked about the number of moles there in 2.0x10^22 molecules of H2O.

We are going to use the formula,
Number of moles = Number of molecules / Avogadro's number

We have the number of molecules: 2.0 x 10^22
Avogadro's number: 6.02 x 10^23

Now we will plug in our information in a scientific calculator:

(2.0 x 10^22) / (6.02 x 10^23) = 0.03 moles is our answer.

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Which statement correctly describes whether a compound is a pure substance? A compound is not a pure substance because each of its molecules is made up of the atoms of two or more different elements. A compound is a pure substance because its molecule cannot be broken down into simpler particles by physical means. A compound is not a pure substance because it is not an element, and only elements are pure substances. A compound is a pure substance because it consists of two different elements, which are pure substances.

Answers

Answer is: A compound is a pure substance because its molecule cannot be broken down into simpler particles by physical means.

Pure substance is made of only one type of atom (element) or only one type of molecule, it has definite and constant composition with distinct chemical properties. Pure substances can be separated chemically, not physically, that is difference between pure substances and mixtures.

Electrolysis of water (pure substance) is the chemical separation, because from one molecule (water) two molecules (hydrogen and oxygen) are produced. Water is separeted into two molecules:

Reaction of reduction at cathode: 2H⁺(aq) + 2e⁻ → H₂(g).

Reaction of oxidation at anode: 2H₂O(l) → O₂(g) + 4H⁺(aq) + 4e⁻.

Answer:

ANSWER:B
i take the test

1. Science is different than many other ways of thinking because it is based on-opinions
-facts
-personal viewpoints
-none of the above

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Answer:

Facts

Explanation:

You can literally read the lesson it tells you science is

all about facts

Complete the following equations by correctly matching the appropriate product.

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Answer: $_(82)^(206)\textrm {Pb}$

Explanation:

Alpha decay: In this process, alpha particles is emitted when a heavier nuclei decays into lighter nuclei. The alpha particle released has a charge of +2 units.

The general alpha decay reaction is given as:

$_Z^A\textrm{X}\rightarrow _(Z-2)^(A-4)\textrm{Y}+_2^4\alpha$

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

Thus the balanced reaction is :

$_(84)^(210)\textrm{Po}\rightarrow _(82)^(206)\textrm{Pb}+_2^4\alpha$

the first equation we are emitting an alpha particle so we take the top number and decrease it by 4 from 210 to 206 and the bottom number by 2 from 84 to 82. so that would match with Pb-206 (the 206 is the top number)

the second equation the 218 will drop to 214 and the 84 to 82 leaving us with Pb-214

These two compounds are in the liquid phase at 293 K a. Br₂ and Hg
b. Cl2 and F2
c. NH4^{+} and H₃O^{+}
d. Fe and Co
e. Diamond and graphite

Answers

It should be br and hg

Which class of elements best conducts electricity

Answers

Metals best conducts electicity

metals conduct all electricity.

Which elements in the periodic table are metalloids or have semimetallic properties

Answers

Hi There! :)

Which elements in the periodic table are metalloids or have semimetallic properties?

Boron, Silicon, Germanium, Arsenic, Antimony, and Polonium are all metalloids. Some people consider Astatine a metalloid

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