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Masteriza [31]
3 years ago
15

Question 9 (5 points)

Chemistry
2 answers:
Ahat [919]3 years ago
8 0
A I think it is air pressure
frozen [14]3 years ago
5 0

Answer:

A. air pressure,this is answer.

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How do we know that stars explode in our<br> galaxy?
yanalaym [24]
We know that it is a certainty based on things such as the size, mass, brightness, etc. They can determine to within a relative level of accuracy the age. Of course they can be off by millions of years, but that’s pretty precise for a 10–20 billion year time period for the life of a star. BUT we absolutely cannot predict exactly when it will explode and we see supernovas in other galaxies, but the last one in the Milky Way that we observed was in the 1600s.
5 0
3 years ago
A student is trying to calculate the density of a ball. She already knows the mass, but she needs to determine the volume as wel
Reptile [31]
Let's examine the given choices:
V = (4/3)*pi*(r)^3 is the rule to calculate the volume of the sphere
V = (1/3)*pi*(r)^2*h is the rule to calculate the volume of the cone
V = s^3 is the rule to calculate volume of the cube
V = pi*(r)^2*h is the rule to calculate volume of the cylinder

Now, the ball can be treated as a perfect sphere, therefore, to calculate its volume we will use the rule of the volume of sphere.

Based on this, the correct choice is:
V = (4/3)*pi*(r)^3
7 0
3 years ago
Read 2 more answers
What is the mole fraction of oxygen in a gaseous mixture containing 25 grams of oxygen, 15 grams of nitrogen, and 10 grams of he
4vir4ik [10]
Convert all the gases from grams to moles using their molar masses first. Remember that nitrogen and oxygen exist as DIATOMIC gases.

O2 - 25 g / 32 g/mol = 0.78 mol O2
N2 - 15 g / 28.02 g/mol = 0.54 mol N2
He - 10 g / 4.0 g/mol = 2.5 mol He

Add all the moles of gases.

0.78 + 0.54 + 2.5 = 3.82 moles

Divide O2 moles by total moles.

0.78/3.82 = 0.20
7 0
3 years ago
Although coal is a complex mixture of substances, its elemental composition can be approximated by the formula <img src="https:/
Svetllana [295]

Answer:

The correct answer is option b.

Explanation:

2C_{135}H_{96}O_9NS+313O_2\rightarrow 270CO_2+2NO_2+2SO_2+96H_2O

Mass of coal burned = 1.00\times 10^6 metric ton = 1.00\times 10^6\times 10^3 kg=10^9 kg[/tex]

1 metric ton = 10^3kg

Molar mass of coal :

135\times 12g/mol+96\times 1g/mol+9\times 16 g/mol+1\times 14 g/mol+1\times 32 g/mol=1906 g/mol=1.906 kg/mol

1 g = 0.001 kg

Moles of coal ,n :\frac{10^9 kg}{1.906 kg/mol}=5.247\times 10^8 mol

If 2 moles of coal on combustion gives 270 moles of carbon dioxide than n moles of coal will give;

5.247\times 10^8 mol\times \frac{270}{2}=7.083\times 10^{10} mol of carbon dioxide.

Molar mass of carbon dioxide gas = 44 g/mol = 0.044 kg/mol

Mass of 7.083\times 10^{10} mol of carbon dioxide:

7.083\times 10^{10} mol\times 0.044 kg/mol=3.11\times 10^{11} kg

5 0
3 years ago
Methyl red is a common azo dye. Which starting materials are used to prepare it?
Licemer1 [7]

Answer:

1. Diazonium salt

2. Coupling component

Explanation:

Azo dyes re synthesized by the combination of two organic compounds viz

1. Diazonium salt

2. Coupling component

1) For methyl red, the diazonium salt which is an intermediate product is produced by  the reaction of hydrochloric acid (HCL) with anthranilic acid and sodium nitrate (NaNO₂)

2) The produced diazonium salt is then combined with dimethylaniline which is a coupling component rich in electrons to undergo a chemical reaction  that by an aromatic substitution mechanism to produce methyl red as the final product.

8 0
3 years ago
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