1. A sample of air has a volume of 140.0 mL at 273 K. To what temperature must the
gas be lowered to reduce its volume to 50.0 mL, at a constant pressure?
Answers
Explanation:
The question had been answered above
Related Questions
A star is estimated to have a mass of 2 1036 kg. Assuming it
to be a sphere of average radius 7. 0 105 km, calculate the average density of the star in units of grams per cubic centimeter
Answers
Density is inversely proportional to volume the smaller the volume occupied by a given mass, the higher the Density of the star is 1,587,553.58 g/cm³.
Density is defined as the quantity that allows us to measure the amount of mass in a certain volume of a substance. Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies.
density= mass÷ volume
Density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.
Mass= 2×10³⁶ kg= 2×10³⁹ g (being 1 kg= 1000 g)Volume of the sphere= 4/3×π×r³ where r is the radius of the sphereVolume of the sphere= 4/3×π×(6.7×10¹⁰ cm)³= 1.2598×10³³ cm³ (being 1 km equals to 100,000 m, 6.7×10⁵ km= 6.7×10¹⁰ cm)Replacing in the definition of density:
Density= 2×10³⁹ g÷ 1.2598×10³³ cm³
=1,587,553.58 g/cm³
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How many moles of Oz would be required to generate 13.0 mol of NO2
in the reaction below assuming the reaction has only 74.1% yield?
2 NO (g) + O2 (g) → 2 NO2 (g)
Answers
Answer:32
Explanation:
Have a nice day :)
3. How can you decrease the pressure of a gas in a container without changing the volume of the gas?
add more gas particles to the container
move the container to a lower altitude
o o
reduce the temperature of the gas
O
change the shape of the container
Answers
Answer:
reduce the temperature of the gas
Explanation:
when you reduce the temperature of the gas the pressure will decrease
How was Dr. Martin Luther King , Jr. , an important force in creating a more just world ?
Answers
Answer:
Martin Luther King, Jr. worked hard to bring greater equality to America and ensure civil rights for all people, regardless of race.
given the following data C =66.7% H =11.1% Calculate the empirical formula of the compund
Answers
First, we calculate the moles of each element taking the percentages as a mass:
\(66,7g\text{ C}\cdot\frac{1\text{ mol C}}{12\text{ g C}}=5,56\text{ mol C}\)\(11,1\text{ g H}\cdot\frac{1\text{ mol H}}{1\text{ g H}}=11,1\text{ mol H}\)We divided the number of moles by the smaller number of moles. In this case, C is the smallest:
\(5,56\text{ mol C/5,56 =1}\)\(11,1\text{ mol H/5,56=1,99}\approx2\)These numbers give us the empirical formula wich is: CH2
Imagine you had salt and pepper mixed together in a cup. What could you try to do
to separate the salt from the pepper?
Without tasting it, is it possible to distinguish salt water from pure water? Explain.
Write here:
To separate the salt from the pepper, I could try....
It
possible to distinguish salt water from pure water because ...
I
add speaker notes
Answers
The first difference that many people noticed was that salt will dissolve in water, but pepper will not. Some say putting it in the water will help. The pepper floats on the surface, while the salt sinks to the bottom and then dissolves. You can then evaporate the water to recover the salt.
define density as applied to organic molecules
Answers
Density is the measure of how tightly packed the molecules of a substance are. In organic molecules, density refers to the mass of the molecule per unit volume.
Organic molecules are composed of carbon atoms and other elements such as hydrogen, oxygen, and nitrogen. These atoms are bonded together through covalent bonds, which determine the shape and size of the molecule. The density of an organic molecule is affected by the mass and volume of its constituent atoms.
The density of an organic molecule can also be affected by the functional groups attached to the carbon backbone. For example, if a molecule has a hydroxyl group (-OH), it will be more dense than a molecule without this group because of the added mass of the oxygen atom.
In addition, the density of an organic molecule can have important implications for its behavior in different environments. For example, if a molecule is less dense than water, it will float on the surface of water, while a more dense molecule will sink.
Overall, density is an important property of organic molecules that can provide valuable insights into their physical and chemical behavior.
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a chemist watches the temperature of a vat of liquid and notices that it increases over time. what can the chemist conclude fromthis observation
Answers
The chemist can conclude that the liquid is gaining heat or experiencing an increase in thermal energy.
What is thermal energy ?Thermal energy in chemistry is the energy transferred from one object to another due to a temperature difference. This type of energy is also known as heat energy and is associated with the motion of molecules within an object. At the molecular level, thermal energy can be seen as the kinetic energy of the molecules which are constantly in motion. When two objects with different temperatures come into contact, heat energy is transferred from the object with the higher temperature to the object with the lower temperature. This process continues until both objects reach thermal equilibrium, meaning that the temperatures of both objects are equal. Thermal energy can also be created by the friction between two objects, or by the combustion of a fuel.
From this observation, the chemist can conclude that the liquid in the vat is undergoing a chemical reaction. To determine the exact nature of the reaction, further analysis would be needed. This could include measuring the rate of temperature increase, the products of the reaction, and the reaction enthalpy.
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Kin 170 molecules are broken down and used for movement and other cellular functions. this process called?
Answers
Kin 170 molecules are broken down and used for movement and other cellular functions. this process called catabolism.
The series of metabolic processes known as catabolism reduces or broken down molecules into smaller pieces that are then either oxidized to produce energy or utilized in other anabolic processes.
Large molecules (such polysaccharides, lipids, nucleic acids, and proteins) are broken down into smaller ones during catabolism (such as monosaccharides, fatty acids, nucleotides, and amino acids, respectively).
The breakdown process in metabolism is called catabolism, and the synthesis process is called anabolism.
Anabolism is a productive metabolism, whereas catabolism is destructive.
Therefore, catabolism provides the chemical energy required for cell development and maintenance.
Examples of catabolic processes include glycolysis, the citric acid cycle, the conversion of fat in adipose tissue to fatty acids, the breakdown of muscle protein to use amino acids as substrates for gluconeogenesis, and the oxidative deamination of neurotransmitters by monoamine oxidase.
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When wood is burned, new substance are produced. Describe this reaction, and explain
what type of changes occurs. Use the terms flammability, chemical property, and physical
change or chemical change.
Answers
Answer:
hahahaha
Explanation:
hahahahahhahahaha soooo funny
What of these should Hailey include in her list?
Synthetic polymers are biodegradable.
Synthetic polymers are not flexible.
Synthetic polymers are recycled cheaply.
Synthetic polymers are inexpensive to produce.
Answers
Answer:
Hailey should add, they are inexpensive to produce.
Explanation:
Reason being why they are inexpensive to produce, is due to them being chemical based and easy to product in the factory setting. Which makes them extremely cheap to make.
Reason being why the others are wrong, synthetic polymers are not biodegradable as they are made in a factory with oils. Synthetic polymers are not flexible due to them being used for harder products. Synthetic polymers are not recycled cheaply as they are made with chemicals which makes it very hard to recycle.
answer:D
Explanation: i took it
Black holes cannot be seen. However scientists think that black holes exist because of their effect on surrounding matter. Describe another force or phenomenon that cannot be seen directly. Give examples of the effects of this force on everyday objects.
BTW this is not the right subject but there is no astronomy category so I am using this subject.
Answers
Answer:
If Black Holes Are "Black," How Do Scientists Know They Are There? A black hole can not be seen because strong gravity pulls all of the light into the middle of the black hole. But scientists can see how the strong gravity affects the stars and gas around the black hole.
Explanation:
some examples; 1. Pushing a wheel barrow.
2. Opening or closing a door.
3. Squeezing wet clothes.
4. Gravitational force.
5. Brakes applied to stop a moving vehicle.
6. A football kicked harder that decreases due to the frictional force.
7. Rubbing a glass rod with a silk.
8. Pressure applied on a pin of a notice board.
9. Running
10. Pushing
Supernova or void is another force or phenomenon that cannot be seen directly similar to black holes.Examples of the effects are gravitational force, brakes applied to stop a moving vehicle.
What is force?Force is defined as a cause which is capable of changing the motion of an object. It can cause an object which has mass to change it's velocity. It is also simply a push or a pull . It has both magnitude as well as direction.Hence, it is a vector quantity.
It has SI units of Newton and is represented by'F'.Newton's second law states that force which acts on an object is equal to momentum which changes with time. If mass of object is constant, acceleration is directly proportional to net force acting on an object.
The concepts which related to force are thrust and torque .Thrust increases the velocity of an object and torque produces change in rotational speed of an object.
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The density of a gaseous organic compound is 340g/L at 45°C and 1.7atm. what is it's mole
Answers
To determine the number of moles of the gaseous organic compound, we can use the ideal gas law equation: PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.
How to calculate ?First, we need to convert the density to mass per volume. The density of the gas is given as 340g/L. Therefore, the mass of 1 L of the gas is 340 g.
Next, we need to use the ideal gas law to calculate the number of moles. We know that the pressure is 1.7 atm, the temperature is 45°C (which is 318 K), and the volume can be calculated using the density and the molar mass of the compound. The molar mass can be determined from the molecular formula of the compound.
Assuming the compound is a hydrocarbon, we can use an average molar mass of 28. Thus, the volume of 1 mole of the gas can be calculated as follows:
V = (molar mass/density) × 1000 ml/L = (28/340) × 1000 = 82.35 ml/mol
Using the ideal gas law equation and plugging in the given values, we get:
n = (PV) / (RT) = (1.7 atm × 82.35 ml) / (0.0821 L atm/mol K ×318 K) = 0.839 mol
Therefore, the number of moles of the gaseous organic compound is 0.839 mol
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40 points pls help me
Answers
Answer:
H2O 2
Explanation:
H2O because 2 H2 + O2--- 2 H2O. 17.14 g of H2 and 1.14 g of O2= H2O
Which of the following is NOT a part of adenosine diphosphate?
glucose, ribose, adenine, two phosphate groups
Answers
Answer:
a. glucose c. ribose b. adenine d. two phosphate groups user: all organisms need energy to perform different functions. cells are able to ...
Identify reagents that can be used to convert acetylene into 2-pentyne. A 1) NaNHz; 2) CH3l; 3) NaNH2; 4) CH3! B 1) NaNHz; 2) CH3l; 3) NaNH2; 4) CH3CH2! C 1) NaNH2; 2) CH3l; 3) CH3CH2! D 1) excess NaNH2; 2) excess CH3!
Answers
Reagents to convert acetylene into 2-pentyne are found in 1) NaNH₂; 2) CH₃I; 3) NaNH₂; 4) CH₃CH₂I.
So, the correct answer is B.
To synthesize 2-pentyne from acetylene, you need to perform two nucleophilic substitution reactions. First, acetylene is treated with NaNH₂ (sodium amide), a strong base, which removes a hydrogen atom from acetylene, generating an acetylide anion. This anion acts as a nucleophile and reacts with CH₃I (methyl iodide), forming 1-butyne. Then, 1-butyne is treated again with NaNH₂, generating another acetylide anion. Finally, this anion reacts with CH₃CH₂I (ethyl iodide), yielding the desired product, 2-pentyne.
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In the body, ______________ are chemical messengers that travel short distances (e.g., brain); whereas _____ are chemical messengers that travel long distances.
Answers
In the body, neurotransmitters are chemical messengers that travel short distances (e.g., brain); whereas hormones are chemical messengers that travel long distances.
In the body, neurotransmitters are chemical messengers that travel short distances, such as within the brain, to transmit signals between nerve cells (neurons). Neurotransmitters are released from the synaptic vesicles of a neuron into the synaptic cleft, where they bind to receptors on the neighboring cell, transmitting the signal across the synapse.
Hormones, on the other hand, are chemical messengers that travel long distances throughout the body via the bloodstream. They are produced by endocrine glands and are released into the bloodstream, which carries them to target cells or organs located at a distance from the site of hormone secretion. Hormones regulate various physiological processes, including growth, metabolism, reproduction, and response to stress.
In summary, neurotransmitters act as chemical messengers for short-distance communication within the nervous system, while hormones serve as chemical messengers for long-distance communication throughout the body via the bloodstream.
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Which equation correctly shows how you could calculate [OH–] from [H+]? StartBracket upper O upper H superscript minus EndBracket equals StartFraction 1.0 times 10 to the negative 14 power over StartBracket upper H superscript plus EndBracket EndFraction. StartBracket upper H superscript plus EndBracket equals StartFraction 1.0 x 10 to the negative 14 power over StartBracket upper O upper H superscript negative EndBracket EndFraction.
Answers
The StartBracket upper O upper H superscript minus EndBracket equals StartFraction equation [OH-] = 1.0 x \(10^_-14\)/ [H+] is used to calculate [OH-] from [H+]. It is derived from the ion product constant for water.
The condition that accurately demonstrates the way that you could work out [OH-] from [H+] is:
[Goodness ] = 1.0 x \(10^_-14\)/[H+]
This condition is gotten from the particle item consistent for water, which is:
Kw = [H+][OH-] = 1.0 x \(10^_-14\)
At 25°C, the convergence of H+ and Gracious in unadulterated water are equivalent and each is equivalent to 1.0 x\(10^_-7\) mol/L. In this way, the pH of unadulterated water is 7.
On the off chance that the grouping of H+ in an answer is known, the centralization of Goodness can be determined involving the particle item consistent for water and reworking the condition to settle for [OH-]. This is on the grounds that the convergence of H+ and Goodness are conversely relative to one another.
Assuming the pH of the arrangement is known, the grouping of H+ can be determined utilizing the condition:
pH = - log[H+]
and afterward subbed into the situation to ascertain [OH-].
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Bromobenzene is converted to a compound with the molecular formula c7h7br in the reaction scheme. Identify the reagents in each step and the products formed in each step.
Answers
Bromobenzene is converted to a compound with the molecular formula c7h7br in the following reaction scheme.
Bromobenzene is an organic compound with the chemical formula C6H5Br. It is a colorless liquid with a sweet, pungent odor. It is used in the production of dyes, pharmaceuticals, and other organic compounds.
Bromobenzene + NaNH2 --> 1-Phenyl-2-bromoethanamine + NaBr
Reagents: Bromobenzene, NaNH2
Products: 1-Phenyl-2-bromoethanamine, NaBr
1-Phenyl-2-bromoethanamine + KOH --> 1-Phenyl-2-hydroxyethanamine + HBr
Reagents: 1-Phenyl-2-bromoethanamine, KOH
Products: 1-Phenyl-2-hydroxyethanamine, HBr
1-Phenyl-2-hydroxyethanamine + HBr --> 2-Bromo-1-phenylethanone + NaBr
Reagents: 1-Phenyl-2-hydroxyethanamine, HBr
Products: 2-Bromo-1-phenylethanone, NaBr
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What kind of rocks might you expect to find on the Moon? Why do you think that?
Answers
Answer:
The Moon's surface is dominated by igneous rocks. The lunar highlands are formed of anorthosite, an igneous rock predominantly of calcium-rich plagioclase feldspar
Explanation:
What is an alkyne?
A. A hydrocarbon containing all single bonds
B. A hydrocarbon containing a carbon-carbon double bond
C. A hydrocarbon containing a carbon-carbon triple bond
D. A hydrocarbon containing an aromatic ring
Answers
Alkynes are called the hydrocarbons. Ethyne is an important alkyne which is used in oxyacetylene gas cutting. A hydrocarbon containing a carbon-carbon triple bond is the alkyne. The correct option is C.
What is an alkyne?In organic chemistry, an alkyne is defined as the unsaturated hydrocarbon containing at least one carbon-carbon triple bond. The alkynes are unsaturated hydrocarbons and their general formula is CₙH₂ₙ₋₂ and the triple bond is known as the acetylene bond.
Many alkynes are found in nature. Ethyne is the first member of the alkyne family in which two carbon atoms are connected by a triple bond. Almost all alkynes are also found to be hydrophobic in nature.
Alkynes show three types of isomerism like chain isomerism, position isomerism and functional isomerism. The triple bond present in the alkynes is its functional group.
Thus the correct option is C.
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when an inflated Balloon in rubbed against the wall ,it sticks to the wall for a while why give reason
Answers
Answer:
the reason is because of friction
Find the empirical formula for a compound made with 41.4% carbon, 3.45% hydrogen, and 55.2% oxygen
Answers
Answer:
CHO 1:1:1
Explanation:
so to simplify just multiply each substance by 100g
carbon 0.414*100 = 41.4g
hydrogen 0.354*100 = 3.45g
oxygen 0.552*100= 55.2g
Now just divide each by its atomic mass
carbon 41.4g/12.0107 = 3.44692649
hydrogen 3.45g/1.00784 = 3.42316241
oxygen 55.2g/16.00= 3.45
They are all approximately 1:1:1 So empirical formula is
C3.4H3.4O3.4 ~ CHO
Calculate the amount of heat energy is needed to raise the temperature of 5.00 grams of lead from 25.0 to 35.0 degrees Celsius, if the specific heat capacity of lead is 0.129 J/g/C.
Answers
Answer: 6.45 Joules
Explanation: I just did it
At what rate does magma deep below Earth's surface cool? What size of crystal results from magma cooling deep below Earth's surface?
O A. Slowly, large crystals form
B Quickly, large crystals form
C. Slowly, small crystals form
D. Quickly, small crystals form
Answers
Answer:
i think it is A
Explanation:
i got this answer from a good friend
The magma deep below Earth's surface cool slowly.Large crystals form results from magma cooling deep below Earth's surface. Therefore, option A is correct.
What is magma ?Magma is the molten or semi-molten natural material that gives rise to all igneous rocks. Magma can be found beneath the Earth's surface, and evidence of magmatism has been discovered on other terrestrial planets and natural satellites.
When magma slowly cools deep within the crust, the resulting rock is known as intrusive or plutonic. Because of the slow cooling, crystals can grow large, giving intrusive igneous rock a coarse-grained or phaneritic texture. Individual crystals in phaneritic texture can be seen with the eye.
Intrusive igneous rocks form when magma slowly cools and solidifies beneath the Earth's surface. Large, well-formed crystals are found in intrusive igneous rocks such as granite, gabbro, diorite, and dunite.
Thus, option A is correct.
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How many significant figures are in each underlined measurement?
Answers
Answer:
Give the number of significant figures in each measurement. By rule 1, all nonzero digits are significant, so this measurement has three significant figures.
Question 11
Which formula represents a hydrocarbon?
C₂H6
C₂H5OH
C₂H5Cl
C₂H6O
Answers
Answer:
C₂H6
Explanation:
Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). Option A
A hydrocarbon is a compound that consists of only carbon and hydrogen atoms. It is important to identify the formula that represents a hydrocarbon among the given options:
A) C₂H6: This formula represents ethane, which is a hydrocarbon. Ethane consists of two carbon atoms bonded together with single bonds and six hydrogen atoms.
B) C₂H5OH: This formula represents ethanol, which is not a hydrocarbon. Ethanol contains a hydroxyl group (-OH), indicating the presence of oxygen in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.
C) C₂H5Cl: This formula represents ethyl chloride, which is not a hydrocarbon. Ethyl chloride contains a chlorine atom (Cl) in addition to carbon and hydrogen atoms. It is a haloalkane, not a hydrocarbon.
D) C₂H6O: This formula represents ethanol, which, as mentioned before, is not a hydrocarbon. Ethanol contains an oxygen atom (O) in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.
Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). It consists only of carbon and hydrogen atoms, making it a suitable representation of a hydrocarbon.
In summary, the formula C₂H6 (option A) represents a hydrocarbon, while the other options contain additional elements (oxygen or chlorine) that make them non-hydrocarbon compounds. Option A
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Which property of matter is conserved in chemical reactions and shown by balanced equations?
Answers
The property of matter that is conserved in chemical reactions and shown by balanced equations is known as the Law of Conservation of Mass. According to this law, mass can neither be created nor destroyed in a chemical reaction; it can only be transformed from one form to another.For instance, when two substances are combined, they react and form a new substance.
The products that are formed contain the same number of atoms as the reactants, but in different configurations. To keep track of the number of atoms on either side of the equation, we use coefficients, which indicate the number of molecules or atoms of each substance in the reaction. However, when a chemical equation is written, it must adhere to the law of conservation of mass.The law of conservation of mass is critical in chemical reactions because it ensures that the amount of reactants that go into a reaction equals the amount of products that come out of it. This means that the total mass of reactants must equal the total mass of the products. As a result, the balanced chemical equation must reflect this law.For example, consider the reaction between hydrogen gas and oxygen gas, which forms water. The balanced chemical equation is as follows:2H2 + O2 → 2H2OIn this reaction, two molecules of hydrogen gas react with one molecule of oxygen gas to produce two molecules of water. The coefficients in the balanced chemical equation indicate that two molecules of hydrogen and one molecule of oxygen combine to form two molecules of water, obeying the law of conservation of mass.In conclusion, the Law of Conservation of Mass is a fundamental principle in chemistry that is used to balance chemical equations. It is critical in chemical reactions because it ensures that the total mass of reactants equals the total mass of products, allowing scientists to accurately predict the outcome of a chemical reaction.For such more question on chemical reaction
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list one long term benefit of exercise
Answers
Answer:
Control your weight. Reduce the risk of disease. Stay in shape etc.
Explanation:
why does a new flu shot need to be made each year ?
Answers
because we could be sick if don't get the shot there is a higher chance to have the flu
i hope this helps you!