CHEMISTRY MIDDLE SCHOOL

What property of a solution is the same before and after it is diluted?A. amount of solute
B. total volume
C. amount of solvent
D. concentration

Answers

Answer 1
Answer:

Answer

A) amount of solute

Explanation

Dilution is adding more solvent to a solution to decrease the concentration of solute in a solution. The amount of solute does not change although the concentration, amount of solvent and the total volume does change.

An example of this would be adding more water (solvent) to lemonade to decrease the concentration of lemon juice (solute). Obviously this would increase the total volume because you are adding more water to the solution.

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Which of these is an example of a physical change?A) iron melting
B) steel rusting
C) paper burning
D) wood decaying​

Answers

A physical change changes the state on object is in, making the answer A) iron melting. Since it's melting, it's going from solid to liquid.

which industrial city would have fewer air pollution incidents related to temperature inversions one on the great plains or one near the rocky mountains

Answers

I'm not positive, but I believe it would be one near the Rocky Mountains.

What is a magnet? Explain what it is please.

Answers

A magnet is a material usually composed of iron, ore or another metallic alloy that has its component atoms so ordered that the material exhibits properties of magnetism, such as attracting other metal alloy objects or aligning itself in an external magnetic field.

Can someone please help me in number 1 and 2 thankss

Answers

1. New moon, waxing gibbous, Full moon, and waning crescent are the main ones but there are more.

2. The revolution of the Earth is 365.25 days while the revolution of the moon is 28 days. Also, the Earth orbits the sun while the moon orbits the Earth and vaguely orbits the sun due to the orbit of the Earth.

3. Tidal waves, seasons, and the lunar cycle.

4. Moonlight is light that is reflected off the moon's surface that comes from the sun. This "lights" the moon up. Sunlight is light that comes from the sun which is made by a bunch of chemical reactions.

Good luck!

HELP ASAP 20 PTS!!!Fireworkium (Fw): This element has 15 protons and 15 electrons in its neutral atom.



Toothium (T): This is a nonmetal with an average atomic mass number close to 19.



Floatium (Fl): This is a gas that the aliens often use to fill balloons and blimps. It contains two protons in its nucleus.



Breathium (Bt): This element is a nonmetal and has one less proton than an atom of Toothium and has an atomic mass close to 16 amu.



Lightium (Lg): This is a gas that does not react with other elements. It glows when it is heated in a lamp or vacuum tube. It contains one more proton in its nucleus than Toothium.



Rottoneggium (Re): This is a nonmetal with one less electron than Mustarium. It has a total of 16 electrons in its electron cloud.


I honestly don't understand

Answers

Basically they are asking you to find the element that is most closely associated with these clues.

1. Fireworkium: 15 protons and 15 electrons? No problem. We can see that the atomic number is 15, in which in real life, the element is Phosphorous. (Phosphorous is a common element in fireworks for an explosive personality and colors)

2. Toothium: A nonmetal with average mass number close to 19? We check the periodic table once more and find that Fluorine is our answer. (Notice that fluorine is in toothpaste, which is why they decided the name Toothier)

3. Breathium: Now honestly, I didn't even have to check the periodic table but just realize that we breath Oxygen. But if you want the straight answer, Oxygen is a nonmetal which has an atomic mass close to 16, and surprise, it has one less proton than Fluorine.

4.Lightium: Immediately we see that since this gas does not react with other elements, it is a noble gas. If it glows in a lamp or vacuum tube, we can also see it is of a light origin. If it has one more proton than Toothium (Fluorine) than we can immediately see that in the periodic table, our answer is Neon.

5. Rottoneggium: We can immediately guess sulfur. The straight way shows that it has 16 electrons, and the non-ion atom should also have 16 protons. Therefore, our answer is Sulfur.

6. I just realized I forgot Floatium: If it has 2 protons, we look in the periodic table and see that our answer is Helium.

The time it takes for a planet to make a complete rotation is also which of the following? A.
the length of its day

B.
the length of its year

C.
the length of its month

D.
the length of its decade

Answers

An action or the movement of the planet on its tilted axis that involves a whole turn or circular motion from its initial point and back to it is called a rotation.

The time it takes for a planet to make a complete rotation is the length of its day.

What is rotation?

Rotation of the planet is the circular turn or the motion of the planets on its axis from one point and back to it.

The rate of the rotation of the different planets varies based on their sizes and distances from the sun. It is also called the length of the day as the rotation defines the circular motion it completes in a defined day.

Therefore, option A is correct.

Learn more about rotation here:

brainly.com/question/3586264
A, because it takes about 24 hours a day for the earth to go around completely.
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