Which of these take place during a chemical change

Answers

Answer 1

Answer: Whenever a chemical reaction happens, two chemicals push each other around and something happens. Each reaction happens differently with each different chemical. Two things can make stuff explode or fizz, it could also smoke like in a volcano experiment.

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The element oxidized in the reaction described in PbO2 + 4HCl → 2H2O + PbCl2 + Cl2 is A. Pb. B. O. C. H. D. Cl.

Answers

For an element to be oxidized, its oxidation number would have to increase.

An element or compound's oxidation number is mainly dependent on its charge, except in special cases.

In PbO₂, Oxygen's oxidation number is always -2, except in hydrogen peroxide where it is -1. Since PbO₂ is neutral, its total oxidation number must be 0. Since there are two oxygens with an oxidation number of -2, we know that Pb's oxidation number is +4, since +4 -2×2 = 0.
Using the same method we can find Pb's oxidation number in PbCl₂. Unless paired with another halogen, which it isn't, Cl in a compound has an oxidation number of -1, so Pb = +2 since +2 -1×2 = 0.
Pb's oxidation number has gone from +4 to +2, so it has been reduced, so A. Pb is not the answer.

Oxygen in a compound's oxidation number is always -2 unless in H₂O₂ and it isn't on either side of the equation, so its oxidation number doesn't change and it remains in a compound, so B. O is not the answer.

Hydrogen in a compound's oxidation number is always +1, except in hydrides when it is -1, but it isn't, so it doesn't change , so C. H is the answer.

Therefore D. Cl is correct, since its oxidation number increases from -1 in HCl to 0 in Cl2 (since elements not in a compound have an oxidation number of 0)

Hope this helps!

How do three states of matter arise?

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The status of the state of matter of a material defines the phase. Pellet currently case 16 is defined; three of which solid, liquid and gas are referred to as conventional cases. There are a total of 16 state currently defined, these classic except; liquid crystal, amorphous solid, magnetic regularly, superconducting, superfluid, the Bose-Einstein condensation, Rydberg molecules, plasma (ionized gas), the quark-gluon plasma, degenerate matter, Superkate, the stringy liquid and SuperCam mine. Daily life in general, solid materials, include liquid or gaseous, but outside world, 99% of the material in the universe plasma (ionized gas) is in the form.

Which substance can not be decomposed by a chemical change?(1) AlCl3 (3) HI
(2) H2O (4) Cu

Answers

Cooper is the substance that can't be decomposed by a chemical chAnge. So 4)

The answer I choose is option (4) Copper

Which of these statements is correct about how the first forms of life appeared on Earth?A.Non-living molecules evolved into living molecules by chemical changes.
B.Reproducing molecules evolved into living organisms by biological processes.
C.Rocks and fossils were transformed into living molecules by biological processes.
D.Atmospheric gases were transformed into living organisms by chemical changes.

Answers

the answer to your question would be A

hope i heled

Answer:

A. Non-living molecules evolved into living molecules by chemical changes.

Explanation:

What color represents the highest elevation

Answers

The Color Red Is What People To Represent High Elevation From: 2,000-2,400 m

red is my answer hope I helped you on this :-D :-D :-D

Express in scientific notation. Make sure your answer has the same number of significant figures as the starting value. 0.01325 = _____

Answers

0.01325 = 1.325x10^-2 or 13.25 x 10^-3 or 132.5 x 10^ - 4 or 1325 x 10^-5. Scientific notation is the standardized way to represent any number as the product of a real number and a power of ten.

Final answer:

The number 0.01325 is expressed in scientific notation as 1.325 x 10^-2. The number of significant figures remains the same.

Explanation:

The starting value 0.01325 can be converted to scientificnotation by first moving the decimal place. In this case, the decimal moved to the right by 2 places, making the number 1.325. So the number in scientific notation becomes 1.325 x 10^-2. Notice that there are still the same 4 significant figures (1, 3, 2, 5) in the number 1.325 as in the original number 0.01325.

Learn more about Scientific Notation here:

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