CHEMISTRY HIGH SCHOOL

Suppose you have two cubes of exactly the same volume. You weigh them and find a mass of 8.91g for one and 8.88g for the other cube even though they are made of the same material. How is this possible? ANSWER FAST

Answers

Answer 1
Answer:

Explanation:

Mass of the cube -1 = 8.91 g

Mass of  the cube-2 = 8.88 g

Volume of the cube-1 = Volume of cube-2 = V

Density of the cube-1 = D

Density of cube-2 = D'

Density=(Mass)/(Volume)

D=(8.91 g)/(V)

D'=(8.88 g)/(V)

(D)/(D')=((8.91 g)/(V))/((8.88 g)/(V))=1.0033

D=1.0033* D'

Density directly depends upon mass of the substance and inversely depends upon volume of the substance.

Here volume of the both cubes are same but masses are different. So, in this case densities of both cubes can be compared on the basis of masses.

This difference in densities of same material can be due following possibles:

1. May be an impurity present in the one of the cubes for which they have given different values their mass.

2. Weighing may not be working well.

3. May be an air trapped inside in one of the cubes.
Answer 2
Answer: The two substances have different densities. Density can be affected by the temperature of a substance. Since they have to same volume but weigh differently, they have different densities. Remember, density = mass/volume

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Explain why hydrogen and oxygen are considered elements whereas water is not considered an element.

Answers

Elements are the simplest building blocks you can break matter down into using purely chemical methods. They are a pure substance made up from only one type of atom.

When you mix elements together these form compounds. The important difference is that as they are a mixture of more than one type of element, they CAN be broken down into more simple substances using chemical means!

As such Hydrogen or Oxygen cannot be simplified chemically (they are therefore elements), however dihydrogen monoxide (H2O or water) is a mixture of these elements that can be broken down using chemical means and so is a compound.
Water is a type of compound . when two elements combine with each other ( hydrogen &oxygen) they forms a compound

The best tool to use to locate the boundaries between countries is a(n) _____.interrupted area map
political map
population map
relief map

Answers

The correct answer is (b) political map

The explanation:

when a political map: is different than other types of maps because it focuses on government or administrative boundaries rather than geographical or physical features. Instead of showing viewers what exists in the land, it shows those imaginary lines that serve to separate countries, states, territories, and cities. These maps generally include larger bodies of water, such as oceans, rivers, and lakes, as landmarks.

It was made by man not natural like the others maps.

so this is the correct answer.

Final answer:

A political map is the best tool to locate the boundaries between countries, providing distinct and accurate depiction of governmental boundaries.

Explanation:

The best tool to use to locate the boundaries between countries is a political map. Political maps are designed to show governmental boundaries of countries, states, and counties.

They also indicate the location of major cities, and they usually include significant bodies of water.

Unlike other types of maps like interrupted area maps, population maps, or relief maps, a political map focuses specifically on the delineation of imaginary lines separating different political entities, making it the ideal tool for identifying country boundaries.

Learn more about Political Map here:

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Of these nonmetals, which one is likely to be the least reactive?A. nitrogen (N)
B. phosphorous (P)
C. sulfur (S)
D. oxygen (O)

Answers

Answer: Phosphorous

Explanation: Nitrogen(N): 7: 1s^22s^22p^3

Phosphorus(P): 15:1s^22s^22p^63s^23p^3

Oxygen(O): 8:1s^22s^22p^4

Sulphur(S): 16:1s^22s^22p^63s^23p^4

As nitrogen contains half filled configuration, it is stable and does not react. Phosphorous lies below nitrogen and reactivity decreases down a group for non metals as they tend to gain electrons as the valence shell move away from the nucleus.

Oxygen has 4 valence electrons, thus it need to gain two electrons to attain stable configuration. Thus is reactive.

Sulphur lies below oxygen and also need to gain two electrons. Reactivity decreases down a group for non metals as they tend to gain electrons as the valence shell move away from the nucleus.
Reactivity increases upward and decreases leftward for these nonmetals. Thus oxygen would be the most reactive since it is the most rightward and upward.

NAME THESE ALCOHOLS. CH3CH2CH2CH2OH AND CH3CH(OH)CH3

Answers

"CH3CH2CH2CH2OH " is known by the name of "n-butanol" and "CH3CH(OH)CH3" is known by the name of "Isopropyl alcohol". These two given products are basically alcohols. I hope that this is the answer that you were looking for and the answer has actually come to your desired help. Thanks for joining brainly and getting your questions solved.

Is NO a polar molecule?

Answers

Electronegativity values are useful in determining if a bond is to be classified as nonpolar covalent, polar covalent or ionic. The electronegativities of oxygen and nitrogen are respectively, 3.44 and 3.04 on Pauling scale, the electronegativity difference being, 0.4. The bond is considered to be non-polar covalent.
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Solutions of aluminum nitrate and sodium sulfate react to form sodium nitrate and aluminum sulfate. Classify this reaction. 2AL(NO3)3(Aq)+3Na2SO4(Aq) ---> AL2(SO4)3(s)+6NaNO3(aq)

A) synthesis
B) decomposition
C) single replacement
D) double replacement

Answers

Answer:

Double replacement.

Explanation:

In the given reaction, there is not synthesis of compound.

The decomposition reactions are those in which a compound dissociates into simpler molecules or ions.

So the given reaction is not decomposition even.

In single replacement reactions, there is replacement of one group from a compound to other compound or element or ion.

Here two groups are being replaced (sulfate and nitrate) so the given reaction will be classified as double replacement.
2 Al(NO₃)₃ + 3 Na₂SO₄ = Al₂(SO₄)₃ + 6 NaNO₃

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Answer D  ( double replacement )

hope this helps!
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