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TEA [102]
3 years ago
13

Which of the following describes a difference between galaxies and solar systems? A. Galaxies contain only moons, while solar sy

stems contain planets.
B. Gravity holds solar systems in orbits but does not exist between stars in galaxies. C. A galaxy is a collection of millions of stars, while a solar system is a star and the planets around it.
D. It's easier to use astronomical units to measure distances in the galaxy but use light years for measurements in a solar system.
Chemistry
2 answers:
nirvana33 [79]3 years ago
8 0
The correct answers should be C
Tomtit [17]3 years ago
8 0

<u>Answer: </u>The correct answer is Option C.

<u>Explanation:</u>

A galaxy is defined as the huge collection of gas, dust and billions of stars along with their solar system. All these systems are held together by the gravitational attraction. For Example: Milky Way.

A solar system is defined as the collection of a star, planets along with their moons, satellites of the planets, asteroids, meteoroids and comets. In the solar system planets revolve around the Star. For Example: Our Solar System has a star named Sun and eight planets revolve around it.

Hence, the correct answer is Option C.

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Which term best describes the molecular geometry of ethylene, C₂H₄?
marusya05 [52]
The molecular geometry is trigonal planar. I would choose E
7 0
3 years ago
A mixture of 454 kg of applesauce at 10 degrees Celsius is heated in a heat exchanger by adding 121300 kJ. Calculate the outlet
stira [4]

Explanation:

The given data is as follows.

           Mass of apple sauce mixture = 454 kg

           Heat added (Q) = 121300 kJ

 Heat capacity (C_{p}) of apple sauce at 32.8^{o}C = 4.0177 kJ/kg^{o}C

So, Heat given by heat exchanger = heat taken by apple sauce

                            Q = mC_{p} \Delta T

or,                    Q = mC_{p} (T_{f} - T_{i})  

Putting the given values into the above formula as follows.

                     Q = mC_{p} (T_{f} - T_{i})  

              121300 kJ = 454 kg \times 4.0177 kJ/kg^{o}C \times (T_{f} - 10)

                      T_{f} = 76.5^{o}C

Thus, we can conclude that outlet temperature of the apple sauce is 76.5^{o}C.

3 0
3 years ago
What is the smallest division on this balance?
sesenic [268]
0.001 would be the smallest.

Good Luck! :)
4 0
3 years ago
Read 2 more answers
How many moles of ions would you expect in an aqueous solution containing one mole of chromium(III) chloride? Hint: write out th
Cerrena [4.2K]

Answer:

Four  

Explanation:

AlCl₃(aq) ⟶ Al³⁺(aq) + 3Cl⁻(aq)

One mole of AlCl₃  produces 1 mol of Al³⁺ and 3 mol of Cl⁻.

That's four moles of ions.

8 0
2 years ago
Strontium sulfate becomes less soluble in an aqueous solution when sodium sulfator is added because
horsena [70]

Answer:

The addition of sulfate ions shifts equilibrium to the left.

Explanation:

Hello!

In this case, according to the following ionization of strontium sulfate:

SrSO_3(s)\rightleftharpoons Sr^{2+}+SO_4^{2-}

It is evidenced that when sodium sulfate is added, sulfate, SO_4^{2+} is actually added in to the solution, which causes the equilibrium to shift leftwards according to the Le Ch athelier's principle. Thus, the answer in this case would be:

The addition of sulfate ions shifts equilibrium to the left.

Best regards!

7 0
2 years ago
Read 2 more answers
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