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Sloan [31]
3 years ago
10

The second step to the scientific method is to state the "problem", the scientific question to be solved. What is one requiremen

t that needs to be fulfilled in order for the "problem" to be valid? A: It needs to be a problem that has a number answer. B: It needs to be a problem that can be solved experimentally. C: It needs to be a problem that has a yes or no answer.
Chemistry
2 answers:
Aleks [24]3 years ago
7 0
The answer is B. In order to test something out you need to be able to solve it.
kykrilka [37]3 years ago
5 0
B B B B B B B B B B B B B B B B BB B B. :)
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Starting with 9.3 moles of O2, how many moles of H2S will be needed and how many moles of SO2 will be produced in the following
tensa zangetsu [6.8K]

<u>Answer:</u> The amount of hydrogen sulfide needed is 6.2 moles and amount of sulfur dioxide gas produced is 6.2 moles

<u>Explanation:</u>

We are given:

Moles of oxygen gas = 9.3 moles

The chemical equation for the reaction of oxygen gas and hydrogen sulfide follows:

2H_2S+3O_2\rightarrow 2SO_2+2H_2O

<u>For hydrogen sulfide:</u>

By Stoichiometry of the reaction:

3 moles of oxygen gas reacts with 2 moles of hydrogen sulfide

So, 9.3 moles of oxygen gas will react with = \frac{2}{3}\times 9.3=6.2mol of hydrogen sulfide

<u>For sulfur dioxide:</u>

By Stoichiometry of the reaction:

3 moles of oxygen gas produces 2 moles of sulfur dioxide

So, 9.3 moles of oxygen gas will produce = \frac{2}{3}\times 9.3=6.2mol of sulfur dioxide

Hence, the amount of hydrogen sulfide needed is 6.2 moles and amount of sulfur dioxide gas produced is 6.2 moles

7 0
3 years ago
If five moles of a gas at a pressure of 5.4 kpa have a volume of 120 liters, what is the temperature?
ra1l [238]
<h3>The temperature is 15.58 kelvin </h3>

<em><u>Solution:</u></em>

<em><u>Ideal gas equation is given as:</u></em>

PV = nRt

Where,

P = pressure

V = volume

n = amount of substance

R = ideal gas constant

T = temperature

From given,

V = 120 liters

n = 5 moles

R = 8.314\ \frac{Lkpa}{mol\  K}

P = 5.4 kPa

T = ?

Therefore,

5.4 \times 120 = 5 \times 8.314 \times T\\\\648 = 41.57 \times T\\\\T = 15.58\ kelvin

Thus the temperature is 15.58 kelvin

4 0
3 years ago
What energy transformation occurs in solar panels found on a roof?
sweet [91]

Explanation:

Solar panels are visible on roof tops on homes and businesses. Solar thermal technology transforms solar energy to heat, which is then used to heat homes, businesses and even swimming pools, or transformed again into electricity.

3 0
3 years ago
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Convert 300.00 dL to L.
Bezzdna [24]

Answer:

Ans:30 litres

Explanation:

1l=10dl

300dl=300/10

=30 dl

7 0
3 years ago
After a covalent bond has stabilized an atom, the atom will have
Dafna1 [17]

<em>Answer:</em>

  • The atom have a full valence electron shell.

<em>Explanation:</em>

  • My question is that why covalent bonds take place?

Every atoms tends to from bond with another atoms in order to get nearest electronic configuration of nobel gases. They become stable when their valence shell become complete. So when covelant bond forms between atoms, share electrons to each other and stabilize themselves.

5 0
3 years ago
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