Examples: natural gas, coal, petroleum
Uses: Fuels are dense repositories of energy that are consumed to provide energy services such as heating, transportation and electrical generation. Even though most fuels ultimately get their energy from the sun (see energy conservation) they are usually considered to be a primary energy source.
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What results will the scientist most likely obtain when placing drops of indicator on the leaves
Answer:
Sugar is made through photosynthesis and without light the plant will not produce sugar. so the answer is plant x dark orange and plant y is dark purple.
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What is molecular magnet? Draw 1 diagrams to show the arrangement of molecular magnets in magnet and magnetic substances.
Help shegshshbdhshdbbshdjdhsnsjsjekeke
Answer:
i think is true..
The theoretical yield of a reaction is 5.00 moles of potassium permanganate (KMnO4) . If the reaction actually produces 616.2 g KMnO4 , what is the percent yield of the reaction
The theoretical yield of a reaction is 5.00 moles of potassium permanganate . If the reaction actually produces 616.2 g KMnO₄ , the percent yield of the reaction is 78 %.
given that :
the theoretical yield of the reaction = 5 mol
mass of the potassium permanganate = 616.2 g
molar mass of the potassium permanganate = 158 g /mol
moles of the KMnO₄ = mass / molar mass
= 616.2 / 158
= 3.9 moles
the percent yield = ( experimental yield / theoretical yield ) × 100 %
= ( 3.9 / 5 ) ×100 %
= 78 %
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Help please help me
Answer: It completely dissociates in water is a characteristic of strong acid.
Explanation:
An acid which dissociates completely to give hydrogen ions [tex](H^{+})[/tex] is called a strong acid.
For example, HCl is a strong acid and it dissociates completely as follows.
[tex]HCl \rightleftharpoons H^{+} + Cl^{-}[/tex]
Strong acids are able to conduct electricity in water as more number of ions are present in the solution as compared to the ions present in a solution of weak acid.
Strong acids increase the concentration of [tex]H^{+}[/tex] ions.
Thus, we can conclude that it completely dissociates in water is a characteristic of strong acid.
If 25.0 mL of 15M nitric acid is diluted to 125 mL, what is the concentration of the new solution?
Answer:2.5M
Explanation:
let the number of moles = x
x/0.025L =15
x= 15*0.025 = 0.375 moles
the concentration of the new solution = moles / volume =
0.375 / (0.025+0.125) = 2.5M
What is the osmotic pressure in atm of
a 0.50 M urea solution at 25.0°C?
Assume R = 0.0821 Latm/molk
Enter text here
Answer:
12.2329 atm
Explanation:
Applying
PV = nRT.................... Equation 1
Make P the subject of the equation
P = (n/V)RT................ Equation 2
Where P = Osmotic pressure, (n/V) = Molarity of urea, T = Temperature, R = molar gas constant.
From the question,
Given: (n/V) = 0.5 M, T = 25°C = (273+25) = 298 K, R = 0.0821 Latm/mol.K
Substitute these values into equation 2
P = (0.5)(298)(0.0821)
P = 12.2329 atm
Is irony the expected outcome?
In literary classes, the three most popular types are verbal irony, dramatic irony, and situational irony. When a speaker or narrator says something that contradicts what they mean, what they intend, or what the context necessitates, this is called verbal irony.
What is irony?One thing is expressed while another is meant in an ironic statement. For example, on a chilly, wet gray day, you would exclaim, "What a gorgeous day!" Alternatively, if you were suffering from a severe case of food sickness, you may respond, "Wow, I feel terrific today." "ffers points of view and ideas that are, at most, intriguing... However, it does not reach the truth." Ronagh and Souder are particularly concerned with scientific assertions that are not meant to be taken seriously.
Here,
The three most common varieties in literary studies are verbal irony, dramatic irony, and situational irony. Verbal irony occurs when a speaker or narrator says something that contradicts what they mean, what they intend, or what the context requires.
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Select the correct answer. what is the name of a system that converts thermal energy into a form of useful mechanical or electrical energy?
a. incubator
b. heat engine
c. centrifuge
d. vacuum column
e. spectrophotometer
Heat engine is a system that converts thermal energy into a form of useful mechanical or electrical energy.
In thermodynamics, the heat engine is a system which is able to convert the heat or thermal energy into mechanical or electrical energy which can be used in order to perform mechanical work. This is achieved by bringing the a particular working substance to a lower state temperature from a higher state temperature.
There are a different types of heat engines in which the Carnot engine possesses the maximum efficiency. Some examples of heat engines are firearms, thermal power station etc.
Hence, the correct option is b. heat engine.
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What happens to the molecules in the room as they change from a liquid to a gas?
When a liquid changes to a gas, the molecules in the room gain enough energy to break the bonds that hold them together in the liquid state.
What are Molecules?
Molecules are the smallest unit of matter that still has the properties of a particular substance. They are made up of two or more atoms that are bonded together. Molecules can be covalent, meaning the atoms in the molecule share electrons, or ionic, meaning one atom has donated electrons to the other.
This energy comes from an increase in temperature, which causes the molecules to move faster and farther apart. As the molecules move around and expand, they fill the room with a vapor or gas.
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What are the molecules of aspartame?
Aspartyl-phenylalanine-1-methyl ester, also known as the methyl ester of the dipeptide of the amino acids aspartic acid and the essential amino acid phenylalanine, is the term for an artificial, non-carbohydrate sweetener.
Sweeter than sugar flavoring ingredient that is broken down into phenylalanine and aspartic acid. Aspartyl-phenylalanine-1-methyl ester, also known as the methyl ester of the dipeptide of the amino acids aspartic acid and phenylalanine, is a synthetic, non-carbohydrate sweetener known as aspartame. Aspartic acid is a methyl ester of a dipeptide made up of aspartic acid and phenylalanine, two amino acids. Along with methanol, aspartame is entirely hydrolyzed to its individual amino acids in the digestive system. In the body, aspartame is hydrolyzed into aspartic acid (40%) phenylalanine (50%) and methanol (10%). An amino is aspartic acid.
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A 40.0 liter gas tank contains 70.0 moles of hydrogen gas. What would be the volume of the tank which could hold 50.0 moles of hydrogen gas at the same temperature and pressure
Answer:
[tex]V_2=28.6L[/tex]
Explanation:
Hello there!
In this case, according to the given information, it is possible for us to solve this problem via the Avogadro's gas law as a way to understand the volume-moles behavior as a directly proportional relationship:
[tex]\frac{V_2}{n_2}=\frac{V_1}{n_1}[/tex]
In such a way, we solve for the final volume as shown below:
[tex]V_2=\frac{V_1n_2}{n_1} \\\\V_2=\frac{40.0L*50.0mol}{70.0mol}\\\\V_2=28.6L[/tex]
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What is the percent composition of YAG (Yttrium Aluminum Garnet). The formula for
YAG is (Y3A15012).
Answer: Y 21.38 % , Al 32.44 % and O 46.16 %
Explanation: Molar mass of YAl5O12 is 88.91 + 5·26.98+12·16
= 415.81 g/mol
m-% ( Y) = 88.91 / 415.81 = 21.38 % , m-% (Al) = 5·26.98 / 415.81 =
32.44 % , rest is Oxygen
Chemical Reactions - Problems
4 NH, +5 O, → 4 NO+6H_O
Which of the following are the reactants in the reaction above?
NH,
NO
I
H₂O
Submit v
IT
A binary covalent bond exists between
A. Any element
B. 2 nonmetals
C. 1met and 1 nonmetal
D. 2 metals
A binary covalent bond exists between 2 nonmetals.
These compounds are termed similarly to binary ionic compounds even though they don't contain ions.
These guidelines apply to the nomenclature of binary covalent compounds:
The complete name of the first element in the formula is given first.
The name of the second element refers to it as an anion.
Prefixes are employed to indicate the number of atoms in a compound. The prefix mono- is dropped if the first element only has one atom.
For instance, carbon monoxide is the name given to CO rather than monocarbon monoxide.
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It takes 75.0mL of a 2.50M HCl solution to neutralize 55.0mL of a base unknown concentration. Calculate the concentration of a unknown basic solution.
If it takes 75.0mL of a 2.50M HCl solution to neutralize 55.0mL of a base unknown concentration, the concentration of a unknown basic solution is 1.83M.
How to calculate molarity?Molarity in chemistry is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution.
The molarity of two solutions in a neutralization reaction can be calculated as follows:
CaVa = CbVb
Where;
Ca = molarity of acidCb = molarity of baseVa = volume of acidVb = volume of baseAccording to this question, 75.0mL of a 2.50M HCl solution is required to neutralize 55.0mL of a base unknown concentration. The concentration of the solution can be calculated as follows:
2.5/75 = Cb/55
0.0333333333 × 55 = Cb
Cb = 1.83M
Therefore, 1.83M is the molarity of the unknown basic solution.
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What should we do to reduce the risk when working with concentrated acids and bases? a) Never work with it b) Work with large volumes c) Neutralize it d) Dilute them
To reduce the risk when working with concentrated acids and bases, it is important to never work with them directly, work with large volumes, neutralize them, and dilute them.
a) Never work with it - Concentrated acids and bases can be extremely dangerous and should never be handled directly.
b) Work with large volumes - In order to reduce the risk, it is important to always work with large volumes of the acid or base so that the concentration is lower.
c) Neutralize it - It is important to neutralize both acids and bases before disposing of them in order to reduce the risk of harm to people or the environment.
d) Dilute them - Diluting acids and bases by adding water can reduce their concentration, making them safer to work with.
To reduce the risk when working with concentrated acids and bases, it is important to never work with them directly, work with large volumes, neutralize them, and dilute them.
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What do these symbols mean?
(s):
(l):
(g):
(aq):
Answer:
(s) : Solide
(I) : Liquid
(g) : gas
(aq) : Aqueous
How many moles are in 50 grams?
3.125 moles of oxygen are present in 50 g.
A mole is the volume of a substance that contains 6.022 X 1023 of the substance's particles, atoms, ions, molecules, etc. A mole is a unit for counting molecules, ions, or atoms. Divide the given mass of an element by its molar mass to find the number of moles in that quantity.
The atomic weight of an element, or its relative atomic mass, on the periodic table, expressed in g/mol, is its molecular mass.
The molar mass of oxygen is 16 g/mol, and there are 3.125 moles in a given amount of mass and molar mass.
Consequently, 3.125 moles of oxygen are present in 50 g.
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A compound is found to contain 15.94 % boron and 84.06 % fluorine by mass. What is the empirical formula for this compound
The empirical formula of the compound is BF3.
The empirical formula of a compound is the simplest whole-number ratio of atoms that represents the compound's composition. To determine the empirical formula of a compound, we need to determine the number of moles of each element present and then simplify the ratio of moles to the smallest whole-number ratio.
First, we can use the percentages of boron and fluorine to find the number of grams of each element present in 100 grams of the compound:
15.94 g boron / 100 g compound
84.06 g fluorine / 100 g compound
Next, we can convert the number of grams of each element to moles using the molar masses of boron and fluorine:
15.94 g B / (10.81 g/mol) = 1.48 mol B
84.06 g F / (18.99 g/mol) = 4.44 mol F
To find the empirical formula, we divide the number of moles of each element by the lowest number of moles:
1.48 mol B / 1.48 mol B = 1.00
4.44 mol F / 1.48 mol B = 3.00
So the empirical formula of the compound is BF3.
It's important to note that this is the empirical formula, and the actual formula of the compound could be a multiple of this depending on the chemical structure of the compound.
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Ex: Mg + 2HCl—-> MgCl₂ + H₂ If 4.48L of H₂ gas at STP is
produced in 40 sec, what is the reaction rate in mol/sec?
Answer:
The reaction rate in mol/sec is 0.005.
Explanation:
To determine the reaction rate in mol/sec, you need to first determine the number of moles of H₂ gas produced in the reaction. The volume of a gas at STP (standard temperature and pressure) is directly proportional to the number of moles of the gas, so you can use the volume of H₂ gas produced to calculate the number of moles.
At STP, 1 mole of a gas occupies a volume of 22.4 L. Therefore, the number of moles of H₂ gas produced in the reaction can be calculated as follows:
moles H₂ = 4.48 L / 22.4 L/mol = 0.2 mol
To determine the reaction rate in mol/sec, you need to divide the number of moles of H₂ gas produced by the time it took for the reaction to occur:
reaction rate (mol/sec) = 0.2 mol / 40 sec = 0.005 mol/sec
So, the reaction rate in mol/sec is 0.005.
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Answer:
b, H2O(s) r H2O(g)
Explanation:
entropy is heat, so increase in heat would mean water gets evaporated or melted, or both in this case. so the only choice above that showed increase in heat is from solid(ice) to gas(water vaper) due to increase in heat in the reaction.
Consider the following equilibrium: Now suppose a reaction vessel is filled with 0. 0406 atm of nitrogen (N_2) and 5. 97 atm of ammonia (NH_3) at 1126. Degree C. Answer the following question this system: Under these conditions, will the pressure of N_2 tend to rise or fall? rise fall Is it possible to reverse this tendency by adding H_2? In other words, if you said the pressure of N_2 will tend to rise, can that be changed to a tendency to fall adding H_2? Similarly, if you said the pressure of N_2 will tend to fall, can that be changed to a tendency to rise by adding H_2? Yes no If you said the tendency can be reversed in the second question, calculate the minimum pressure of H_2 needed to reverse it. Round your answer to 2 significant digits. Atm
Yes, if we add a lot of H₂, the value of K will start falling, which will cause the reaction to move forward. The minimum pressure of H₂ needed to reverse it is 3.598atm.
Describe pressure.The force applied per area is referred to as pressure.
ΔG° = -RT ln(K)
34000 = 8.314(273 + 1126)ln(K)
ln(K) = 2.9231
K = [tex]e^{2.9231}[/tex] = 18.834
Since the container doesn't contain any H₂ gas, K will therefore start out at infinity. The reaction will move in the opposite direction in order to reach equilibrium. Consequently, the pressure of N₂ will initially rise.
Yes, if we add a lot of H₂, the value of K will start falling, which will cause the reaction to move forward.
The answer is therefore yes.
K = (5.97)²/0.0406(PH₂)³
K = 3.598atm.
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how does the pitcher plant use chemical reactions
Answer: Pitcher plant have adapted themselves to live in poor nutriet soil As they are carnivorous and feed on the insects is the major adptation for them as they does not have proper nutrients,availabilty for the growth.
Explanation:
in this lab, you perform the above reaction starting with 20.0 L of propane at STP. what volume of h2o will be produced
1 mole of any gas occupies 22.4 L volume. The molecular weight of water is 18 grams. Thus 18 gram of Water will also occupy 22.4 L.We know that at STP one mole of any gas occupies 22.4litres . It means that one mole of hydrogen also occupies 22.4litres of volume at STP. So 10moles of hydrogen gas will occupy =22.4×10=224litres of volume at STP.
( copper is Cu) How many Copper atoms in 3CuSO 4
Need help ASAP !!!!!
An ideal gas (which is is a hypothetical gas that conforms to the laws governing gas behavior) confined to a container with a massless piston at the top. (Figure 2) A massless wire is attached to the piston. When an external pressure of 2.00 atm is applied to the wire, the gas compresses from 6.40 to 3.20 L . When the external pressure is increased to 2.50 atm , the gas further compresses from 3.20 to 2.56 L .
In a separate experiment with the same initial conditions, a pressure of 2.50 atm was applied to the ideal gas, decreasing its volume from 6.40 to 2.56 L in one step.
If the final temperature was the same for both processes, what is the difference between q for the two-step process and q for the one-step process in joules?
Answer: -162,120J
Explanation:
Okay, so q stands for work, given by the formula q = -P∆V,
For the first round, we have 2atm (for P) and a volume change of 3.2 (6.4-3.2) for the first experiment.
Find the work: q = -2 • (3.2 - 6.4) = 6.4L/atm
For the second experiment, it is now 2.5atm, with the change in volume going from 3.2 to 2.56.
So, work is q = -2.5(2.5 - 3.20) = 1.6L/atm
Add the total work: 1.6 + 6.4 = 8L/atm
To find the Joules per L/atm, recall that a mol of gas in K is 8.31447J, while the gas constant where a liter of gas per mol in K is 0.08206L/atmK. Divide these two values, which leaves us with 101,325J
So, for the first round, multiply 8 x 101,325, which leaves us with 810,600J.
Second round: The pressure is 2.5atm, with the volume change from 6.40 to 2.56
Solve for work: q = -2.5(2.56-6.4) = 9.6L/atm
Multiply with the Joule unit found earlier: 9.6 x 101,325 = 972,720J.
To find the difference, subtract the value of the single-step process (second round) from the first round (multistep)
810600 - 972720 = -162,120J. Therefore, it takes more heat to do the single step than the multistep process.
in a paper chromatogram why is substance impure
Answer:
Chromatography is used to see if substance is pure or to identify the subtances in a mixture. Components of a mixture are identified by the relative distance travelled compare to the distance travelled by the solventExplanation:
I hope it helpsIs 1 mole equal to 1 molecule?
No, a mole doesn't equal a molecule. Despite the fact that the terms "moles" and "molecules" are separate, the idea of "moles" can be used to quantify the number of molecules in a sample.
The primary distinction between a mole and a molecule is that a mole is a unit of measurement for amount whereas a molecule is an atomized chemical species.
A mole of a substance is the same number of molecules of that substance as there are carbon-12 atoms in precisely 12 g of the element. This indicates that the molecular weight of any material, stated in terms of atomic mass units, is equivalent to 1 mole of that substance's weight in grams.
Thus, a mole is an amount of 6.02210²³ particles, whereas a molecule has several atoms of different elements that are chemically connected to one another.
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A large dam was constructed across a river to create a reservoir on one side. This led to the sinking of nearby forests, which
impacted plants and animals and caused a decrease in biodiversity, Trees were also cut down to construct the dam, which led to
increased soil erosion and reduced soil fertility.
A scientist wants to reduce the impact of the dam's construction and improve the biodiversity of the ecosystem. Which solution
should the scientist choose?
A. relocating people to live in the area around the dam
B. planting trees around the reservoir to decrease soil erosion
c. using synthetic fertilizers to improve soil fertility
OD. building a small series of dams on nearby streams
Answer:
B
Explanation:
One of the main problems is the soil erosion reducing the fertitlity of the soil, thus reducing it's chances of the soil helping plant growth, thus reducing biodiversity. The other selections worsen the problem.