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4 years ago

Which of the following has the least number of identified substances?

1 answer:

Nookie1986 [14]4 years ago

8 0

Subatomic particles:
These are too small for people to really know much about them, scientists think that there are only about three: protons, neutrons, and electrons

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Which energy transfer takes place when water freezes to form ice crystals in the atmosphere?

Tom [10]

<span>Energy is transferred from the water into the air </span>

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4 years ago

Crude oil is a liquid kind of___________<br><br> what is the answer?

Fantom [35]

<h2>What kind of liquid is crude oil?</h2>

<h3>First, let's get to know what is crude oil.</h3>

crude oil is a naturally occuring petroleum product composed of hydrocarbon deposits and other organic materials. A type of fossil fuel, crude oil is refined to produce usable products including gasoline, diesel, and various other forms of petrochemicals.

<h3>What kind of liquid is crude oil?</h3>

crude oil is a mixture of comparatively volatile liquid hydrocarbons (compounds composed mainly of hydrogen and carbon), though it also contains some nitrogen, sulfur, and oxygen. those elements form a large variety of complex molecular structures, some of which can be readily identified. regardless of variations, however, almost all crude oil ranges from 82 to 87 carbon by weight and 12 to 15 hydrogen by weight.

<h2>What are the uses of crude oil?</h2>

<h3>crude oil has many uses as </h3><h3>the following:</h3>

plastics. plastics requires crude oil for it's production.
clothing materials like T-shirt, and Short pants.
products in your home like furnitures, and kitchenware.
transportation
get high-quality bulk fuels from Kendrick oil.

<h2>so now you know the uses and importance of </h2><h2>crude oil.</h2>

#let's study

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3 years ago

ppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppplllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll

sp2606 [1]

Answer:

YIkES One thing u can do i ask your teacher about it or say that u need help with it the cant make fun of u because u need help with your work.

8 0

3 years ago

Read 2 more answers

Hello, everyone!

marusya05 [52]

Answer: 27.09 ppm and 0.003 %.

First, <u>for air pollutants, ppm refers to parts of steam or gas per million parts of contaminated air, which can be expressed as cm³ / m³. </u>Therefore, we must find the volume of CO that represents 35 mg of this gas at a temperature of -30 ° C and a pressure of 0.92 atm.

Note: we consider 35 mg since this is the acceptable hourly average concentration of CO per cubic meter m³ of contaminated air established in the "National Ambient Air Quality Objectives". The volume of these 35 mg of gas will change according to the atmospheric conditions in which they are.

So, according to the <em>law of ideal gases,</em>

PV = nRT

where P, V, n and T are the pressure, volume, moles and temperature of the gas in question while R is the constant gas (0.082057 atm L / mol K)

The moles of CO will be,

n = 35 mg x $\frac{1 g}{1000 mg}$ x $\frac{1 mol}{28.01 g}$

→ n = 0.00125 mol

We clear V from the equation and substitute P = 0.92 atm and

T = -30 ° C + 273.15 K = 243.15 K

V = $\frac{0.00125 mol x 0.082057 \frac{atm L}{mol K} x 243 K}{0.92 atm}$

→ V = 0.0271 L

As 1000 cm³ = 1 L then,

V = 0.0271 L x $\frac{1000 cm^{3} }{1 L}$ = 27.09 cm³

<u>Then the acceptable concentration </u><u>c</u><u> of CO in ppm is,</u>

c = 27 cm³ / m³ = 27 ppm

<u>To express this concentration in percent by volume </u>we must consider that 1 000 000 cm³ = 1 m³ to convert 27.09 cm³ in m³ and multiply the result by 100%:

c = 27.09 $\frac{cm^{3} }{m^{3} }$ x $\frac{1 m^{3} }{1 000 000 cm^{3} }$ x 100%

c = 0.003 %

So, <u>the acceptable concentration of CO if the temperature is -30 °C and pressure is 0.92 atm in ppm and as a percent by volume is </u>27.09 ppm and 0.003 %.

5 0

3 years ago

What do butterflies and lobsters have in common?

Stella [2.4K]

Answer:

They all wear their skeletons on the outside! This is called an exoskeleton and all creatures that have their structure on the outside are included in the phylum of Arthropods.

Explanation:

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3 years ago