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alekssr [168]
3 years ago
15

Evidence shows that interstellar bodies are moving away from Earth, some faster than others, which BEST suggests that the univer

se
A) is shrinking.
B) is expanding.
C) was not formed by a big bang.
D) has always been the same size.


Our Solar System is in the Milky Way galaxy. What shape is this galaxy?
A) oval
B) rectangular
C) spiral
D) triangular


Our solar system lies in
A) the central ring of the Milky Way.
B) one of the spiral arms of the Milky Way.
Eliminate
C) in the galactic center of the Milky Way.
D) outside the spiral arms of the Milky Way.
Chemistry
2 answers:
Tomtit [17]3 years ago
8 0
1. B it's expanding.
2. c Our galaxy, the milky way is a spiral galaxy. you can by looking at it's spiral shape.
3. b We are in one of the Milky way's spiral "arms".
madam [21]3 years ago
6 0
B the answer...........

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A sample of gas occupies a volume of 4.5 L at 20 Celsius. What volume will it occupy at -15 celsius, if the pressure remains con
nataly862011 [7]

Answer: 3.96L

Explanation:

PV = nRT

The way I like to do it, it's I get rid of whatever I do not need.

We have to do an equation for sure to make both sides equal and find our desired result.

The pressure is constant, so it would be constant in both sides, therefore, there is no point in using it.

The R is a constant used in both sides so there is no point on using it either.

We don't need to work with moles in this case, so let's forget about the moles.

Therefore we are left with only V (volume ) and T(Temperature)

Which would logically make this:

V1/T1 = V2/T2

OR

T1/V1 = T2/V2

Both of these would work, we always use whatever makes our calculations easier without complicating our lives with the algebra.

That should remind you of Charles' Law

Transform degrees into kelvins

20 + 273.15 = 293.15K

-15 + 273.15 = 258.15K

So, 4.5L/293.15K = V2/258.15K

V2 = (4.5L/293.15K) x 258.15K

V2 = 3.96L

8 0
3 years ago
What causes pressure inside an inflated soccer ball?
ioda

Answer:

A

Explanation:

Ball bounces because of the difference in the air pressure on the outside of the ball, and opposite the point of impact, and the pressure inside of the ball. This means that the inside of the ball now has less space to contain the air molecules contained inside the ball, increasing the pressure inside the ball.

3 0
3 years ago
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Which of the following is a true for subtropical jet streams​
vodka [1.7K]

Answer: how do we answer when there are no options??

Explanation:

5 0
3 years ago
25. Energy is released during the fissionof Pu-239 atoms as a result of the(1) formation of covalent bonds(2) formation of ionic
Mariulka [41]
Answer ( 3 ) :

<span>conversion of matter to energy .
</span>
hope this helps!
4 0
3 years ago
Which of the following will affect the rate of a chemical reaction?
dimulka [17.4K]

Answer:

Solute concentration will afect the rate of a chemical reaction, because you must work with molarity

Explanation:

I think that solute mass may be it can affect the rate of reaction, if you have more mass in a solute, you will also have more moles.

If you want to know more, you have to consider temperature in the reaction and the  presence of catalysts. They all, affect reactions.

7 0
3 years ago
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