CHEMISTRY MIDDLE SCHOOL

In which sample of water do the water particles have more energy : 5grams of ice cubes at -10 C, or 5 g of liquid water at 20 C? How do you know?

Answers

Answer 1
Answer:

Answer: 5 grams of liquid water at 20°C will have more energy.

Explanation:

Kinetic energy is the measure of temperature of the system.

The equation used to calculate kinetic energy of a particle follows:

E=(3)/(2)kT

where,

E = kinetic energy of the particles

k = Boltzmann constant  = 1.38* 10^(-23)J/K

T = temperature of the particle

From the above relation, it is visible that kinetic energy is directly related to the temperature of the system.

If the temperature of the particles is high, it means that the particles will have more energy.

We are given:

5 grams of ice cubes at -10°C

5 grams of liquid water at 20°C

So, the temperature of water particles is more than the temperature of ice cube.

Hence, 5 grams of liquid water at 20°C will have more energy.
Answer 2
Answer: 5 g of liquid water at 20 C because liquids have a higher kinetic energyand the temperature is higher than that of the ice cubes

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Have people considered that aliens could possibly live without oxygen and water and we are looking in the wrong direction for a new life form?This is astronomy, not chemistry. Sorry, they do not have the option of astronomy.

Answers

I have never heard anyone ever say anything about aliens only living by using the same metabolistic processes as humans... But.. there may likely be another planet out there that does use oxygen, although at a different percentage from Earths. Anyways, even if we do find "other" life forms, who's to say that they're on the same level as us? Have you ever considered the fact that ants to us are like we are to other life forms out there and maybe they don't want or can't communicate with us because they see themselves as superior?

Hope that helps!

Which soil horizon contains a layer of partially weathered or unweathered rock? A. E
B. R
C. O
D. C

Answers

Answer:

B.  R

Explanation:

A layer of partially weathered or unweathered rock is present in R soil horizon

Answer: Option (B)

Explanation: The R-layer represents the unweathered rocks that are located below the surface and is the lowest layer in the soil profile. Here, hard rocks are found which are difficult to break, and are breakable with heavy machineries only. This R-layer makes the foundation of the soil profile that supports the entire overlying series of layers.

Thus, the correct answer is option (B).

a solution in which 50 grams of solute is dissolved in 250 grams of solution has a concentration of what percent?

Answers

16.66667% or 17% to the nearest percent. (50/(250+50)) x 100 or (50/300) x 100. I hope you can see how I got to those numbers.

I need somebody to help me with my homework pls i dont get it .

Answers

26. B
27. D
28. C
Hope this helped ☺️

Which statement about carbon monoxide and aluminium oxide is correct? *C Carbon monoxide is amphoteric but aluminium oxide is neutral.
B Carbon monoxide and aluminium oxide are both neutral.
A Carbon monoxide and aluminium oxide are both amphoteric.
D Carbon monoxide is neutral but aluminium oxide is amphoteric.

Answers

Answer:

Carbon monoxide is neutral but aluminium oxide is amphoteric

Explanation:

⇒ Carbon dioxide is neutral but sometimes it's slightly acidic.

⇒ Aluminium Oxide is amphoteric reacting both with acids and bases

Why does methane have a low boiling pint?

Answers

Methane is an alkane. Alkanes are composed of a number of carbons (denoted by the prefix on the chemical name, e.g. meth-ane, eth-ane, prop-ane, but-ane...) which are saturated with hydrogen atoms (the largest number of hydrogens possible are bound to them). Methane has one carbon, which is saturated with 4 hydrogen atoms - this means that the chemical formula is CH4 (where the 4 should be subscript, but I can't work it out in this text field).

The boiling point depends on the strength of the intermolecular forces between each molecule - as the length of the molecule increases, so does the force of attraction between them because there are more points to attract together. Methane has a very short chain length of only 1 carbon, so the intermolecular forces are very weak. Because the forces are weak, very little energy is required to overcome them to allow the substance to become gaseous (gas molecules spread out to fill any space, requiring a negligible strength of intermolecular forces).

Consequently the boiling point of methane is so low that it is found in gaseous form almost all of the time on Earth - however Titan, one of the moons of Saturn, has seas of methane on its surface, because it is so cold there that it is possible for methane gas to condense into liquid.
In order to consider the boiling point of a substance, we need to think about the forces holding the molecules together. Because methane (CH4) is a non-polar molecule the molecules are held together only by London Dispersion Forces which are very weak and easy to break. These bonds break when methane boils and because they are weak, it boils at a low temperature.
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