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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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How do I study Chemistry efficiently?
TEA [102]
Review and Study Material Before Going to
Class.

Seek Understanding.

Take Good Notes.

Practice Daily.

Take Advantage of Lab Time.

Use Flashcards.

Use Study Groups.

Break Large Tasks Into Smaller Ones.
5 0
3 years ago
At a festival, spherical balloons with a radius of 280. Cm are to be inflated with hot air and released. The air at the festival
evablogger [386]

Answer:

8608.18 balloons

Explanation:

Hello! Let's solve this!

Data needed:

Enthalpy of propane formation: 103.85kJ / mol

Specific heat capacity of air: 1.009J · g ° C

Density of air at 100 ° C: 0.946kg / m3

Density of propane at 100 ° C: 1.440kg / m3

First we will calculate the propane heat (C3H8)

3000g * (1mol / 44g) * (103.85kJ / mol) * (1000J / 1kJ) = 7.08068 * 10 ^ 6 J

Then we can calculate the mass of the air with the heat formula

Q = mc delta T

m = Q / c delta T = (7.08068 * 10 ^ 6 J) / (1.009J / kg ° C * (100-25) ° C) =

m = 93566.96kg

We now calculate the volume of a balloon.

V = 4/3 * pi * r ^ 3 = 4/3 * 3.14 * 1.4m ^ 3 = 11.49m ^ 3

Now we calculate the mass of the balloon

mg = 0.946kg / m3 * 11.49m ^ 3 = 10.87kg

The amount of balloons is

93566.96kg / 10.87kg = 8608.18 balloons

5 0
3 years ago
Read 2 more answers
How many moles are in 2.12g Cr2O3
ohaa [14]

Answer:

0.01395mol Cr2O3

Explanation:

the molar mass of Cr2O3 is 151.9904 g/mol

2.12g Cr2O3 x 1 mol/151.9904g = 0.01395mol Cr2O3

4 0
2 years ago
A/an _______ is the smallest unit of matter that has the characteristics of a chemical element.
julsineya [31]

Answer:

The answer is atom.

Explanation:

7 0
2 years ago
Read 2 more answers
Potassium fluoride (KF, a salt, has a molecular weight of 58.10 grams. How many grams would be needed to make 1.0 liter of 5.0 m
AlladinOne [14]
The concentration of the solution is 5.0 molar, which is 5.0 mole/L.  So in the 1.0 L of 5.0 molar KF salt solution, the moles of KF is 5.0molar*1.0L=5.0 mole. The molecular weight of KF is given in the question as 58.10 gram/mole, so the grams of KF is 58.10 gram/mole * 5.0 mole = 290.5 gram.
3 0
2 years ago
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