CHEMISTRY HIGH SCHOOL

The complete combustion of fossil fuels and refuse producesA) radon and carbon monoxide.
B) volatile organic compounds.
C) sulfuric acid and nitric acid.
D) carbon dioxide and water vapor.

Answers

Answer 1
Answer:

Final Answer:

The complete combustion of fossil fuels and refuse produces D) carbon dioxide and water vapor.

Explanation:

Fossil fuels and refuse, when subjected to complete combustion in the presence of sufficient oxygen, undergo a chemical reaction. This reaction primarily produces carbon dioxide (CO2) and water vapor (H2O).

In summary, complete combustion of fossil fuels and refuse results in the production of carbon dioxide (CO2) and water vapor (H2O) as the primary products.

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Answer 2
Answer:

Final answer:

The complete combustion of fossil fuels and refuse produces carbon dioxide and water vapor.

Explanation:

The complete combustion of fossil fuels and refuse produces carbon dioxide and water vapor. During combustion, the carbon in fossil fuels and refuse combines with oxygen from the air, resulting in the production of carbon dioxide (CO2) as the primary product. Additionally, hydrogen in the fuels and refuse combines with oxygen to form water vapor (H2O). This process releases energy in the form of heat and light.

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Which planet do scientists believe prevented the asteroids in the asteroids belt from forming a planet? A. Earth
B. Jupiter
C. Mars
D. Neptune

Answers

I think it is Jupiter. Let me know if I am right, I hope I am.

Answer: Jupiter is believed to have prevented the asteroids in the asteroid belt from forming a planet.

Please help !!!Which of the following alcohols is now commonly being used as fuel additive?

methyl alcohol
ethyl alcohol
isopropyl alcohol
none of the above

Answers

Out of the following alcohols we can conclude the correct answer choice by going through our options, looking at their chemical formulas/structures and defining their usage.

 Ethyl alcohol (CH3CH2OH) :  Most commonly found in alcoholic beverages.

Isopropyl alcohol (C3H8O) : Is what is known as rubbing alcohol, most commonly used as a cleansing liquid.
 
Methyl alcohol (CH3OH) :  Is most  commonly used  as formaldehyde, jet fuel, and antifreeze.

So looking at our options we can conclude that the correct answer choice would be Methyl Alcohol because it is used as an additive in jet fuel.

Hope this helps! If you have any other questions or would like further explanation just let me know!  :)
Actually the correct answer is B. Ethyl Alcohol.

A body moving with a velocity of 20 m/s begins to accelerate at 3 m/s2. How far does the body move in 5 seconds?A. 137.5 m
B. 196 m
C. 260 m
D. 162.5 m

Answers

The distance covered will be:

d = v_0\cdot t + (1)/(2)a\cdot t^2 = 20(m)/(s)\cdot 5\ s + (5)/(2)(m)/(s^2)\cdot 5^2\ s^2 = \bf 162,5\ m

The correct answer is D).

The Correct answer to this question for Penn Foster Students is: 137.5 m

Linolenic acid (C18H30O2) can be hydrogenated to stearic acid by reacting it with hydrogen gas according to the equation: C18H30O2 + 3H2 --->C18H36O2 What volume of hydrogen gas, measured at STP, is required to react with 10.5 g of linolenic acid in this reaction?

Answers

1.998 ml of hydrogen gas volume is is required to react with 10.5 g of linolenic acid in this reaction.

Explanation:

Data given:

mass of linolenic acid is given = 10.5 grams

atomic mass of linoleinic acid = 278.43 grams/mole

volume of hydrogen required at STP = ?

Balance chemical reaction:

C18H30O2 + 3H2 --->C18H36O2

moles of linoleinic acid given  = (mass)/(atomic mass of 1 mole)

putting the values in the equation:

moles of linoleinic acid = (10.5)/(278.43)

                                      = 0.037 moles

from the balanced equation:

1 mole of linoleinic acid reacts with 3 moles of hydrogen

so, 0.037 moles will react with x moles of hydrogen gas

(1)/(3) = (0.037)/(x)

x = 0.111 moles of water

volume or mass = atomic mass x number of moles

volume of hydrogen gas= 1.998 ml

Final answer:

Around 2.53 liters of hydrogen gas, at STP, is required to fully hydrogenate 10.5 g linolenic acid to stearic acid.

Explanation:

To solve this problem, we first need to find the molar mass of linolenic acid (C18H30O2). The molar mass is calculated by adding the molar masses of all the atoms in the molecule: (18*12.01) + (30*1.01) + (2*16.00) = 278.44 g/mol. Next, we calculate the number of moles of the linolenic acid we have: 10.5 g / 278.44 g/mol = 0.0377 mol. According to the balanced chemical equation, we need 3 mol of hydrogen per mol of Linolenic acid, so we need 0.0377 mol * 3 = 0.1131 mol of hydrogen gas. Finally, at STP, 1 mole of any type of gas occupies a volume of roughly 22.4 L, so the volume required is 0.1131 mol * 22.4 L/mol = 2.53 L.

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A compound contains only carbon, hydrogen, nitrogen, and oxygen. Combustion of a 2.18 g sample burns in excess oxygen yields 3.94 g of CO2 and 1.89 g of H2O. A separate experiment shows that a 1.23 g sample contains 0.235 g of N. Calculate the moles of C in the sample.1. Calculate the moles of N for a 2.18 g sample (the sample size for the other analyses).
2. Calculate the moles of O in the sample.

Answers

Answer:

The answers are

C = 0.0895 moles

1. 0.02975 moles of N

2. 0.0299 moles O

Explanation:

Mass of sample = 2.18 g

Combustion yields 3.94 g of CO₂ and 1.89 g of H₂O

1.23 g of sample contains 0.235 g of N

3.94 g of CO₂ which contains one mole of C and two moles of O

Molar mass of CO₂ = 44 mass fraction of C = 12/44 = 0.273, Therefore mass of  carbon in 2.18 g = 0.273×3.94 = 1.075 g

number of moles of C in sample = mass/(molar mass) = 1.075 g/(12.01 g/mol) = 0.0895 moles of C

(1) Mass of nitrogen, in 1.23 g of sample = 0.235

therefore mass in 2.18 g =0.235×2.18/1.23 = 0.4165 g

= 0.02975 moles of N

(2) To find the number of moles of oxygen in the sample we note that total mass of sample  = 2.18 g containing only nitrogen, hydrogen, oxygen and carbon

Mass of hydrogen can be fround from 2/18×1.89 = 0.21 g

Mass of oxygen therefore = 2.18 -(0.21+0.4165+1.075) = 0.4785  

number of moles = 0.475/16 = 0.0299 moles

0.0034ks= what in cs

Answers