A sample of methane collected when the temp was 30 C and 760mmHg measures 398 mL. What would be the volume of the sample at -5 C and 616 mmHg pressure
Answer:
434.32mL
Explanation:Using the combined gas law:
[tex]\frac{PV}{T}[/tex] = k
Where;
P = Pressure
V = Volume
T = Temperature
k = constant.
It can be deduced that:
[tex]\frac{P_1V_1}{T_1}[/tex] = [tex]\frac{P_2V_2}{T_2}[/tex] = k ---------------------(i)
Where:
P₁ and P₂ are the initial and final pressures of the given gas
V₁ and V₂ are the initial and final volumes of the given gas
T₁ and T₂ are the initial and final temperatures of the gas.
From the question:
the gas is methane
P₁ = 760mmHg
P₂ = 616mmHg
V₁ = 398mL
V₂ = ?
T₁ = 30°C = (30 +273)K = 303K
T₂ = -5°C = (-5 +273)K = 268K
Substitute these values into equation (i) as follows;
[tex]\frac{760*398}{303}[/tex] = [tex]\frac{616*V_2}{268}[/tex]
Solve for V₂
V₂ = [tex]\frac{760*398*268}{616*303}[/tex]
V₂ = 434.32mL
Therefore, the volume of the sample at -5C and 616mmHg pressure is 434.32mL
please help me im literally so confused
Answer:
A
Explanation:
Mark me brainliest pls
Indicate whether F3C−C≡N is linear, planar, or neither.
O linear
O planar
O neither linear nor planar
Left C would be neither linear and neither planar since, in accordance with the preceding definition, it has a tetrahedral form.
Which is better, planar or non-planar?Since no links cross one another, graph A is planar. Because so many connections overlap, graph B is not plane. Additionally, graph B's linkages cannot be rearranged in a way that makes it planar.
How does one recognize planar?A compound is said to be planar if every atom inside it is located on the same plane. - Take the organic compound, for example. When the carbon atoms of an organic molecule lay within a single plane, the complex is referred to as a planar compound.
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Which type is a metamorphic rock formed from shale
- Slate
- Sandstone
-Limestone
-Gneiss
slate is the correct answer i PROMISE
(. ^ ᴗ ^.)
The boiling point of acetone is 50.5°C, while the boiling point of water is 100°C. Bringing a solution made of water and acetone to which of the following temperatures would allow the separation of these two liquids?
The temperature must be greater than 50.5°C and less than 100°C.
What is temperature ?
Temperature is a physical property that is used to measure the average kinetic energy of particles in a system, such as a gas, liquid, or solid. It is measured in units of degrees on the Celsius, Fahrenheit, or Kelvin scales.
Temperature is related to the average kinetic energy of particles in the system, and is affected by the number of particles, their mass, and the strength of their interactions.
Which temperature range is typical?
Core temperature is 98.6 F on average (37 C). However, the average body temperature might be anywhere from 97 F (36.1 C) to 99 F (37.2 C) or higher. Depending on the period of year or how busy you are, your body temperature may change. In general, elderly people's temperature are lower than those of younger people.
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What is Gay- Lussacs law? State the definition of law in your own words.
A 325 0 g piece of gold at 427 degree C is dropped into 200.OmL of water at 22 0 degree C. Calculate the final temperature of the mixture. Specific Heat of gold
The final temperature of the mixture is 218.1°C.
The Specific Heat of gold 0.0123 J.
What is specific heat ?Specific heat is known to be the amount of energy required to raise the temperature of a unit mass of a substance by 1 degree. It is a physical property of matter, usually expressed in units of Joules/Kilograms/Kelvin (J/kgK).
Mass of gold = 325 g
Heat absorbed by water = mass of gold x specific heat x temperature change
325 x 0.128 x 405
Heat absorbed by water = 154,400 J
Heat capacity of water = mass of water x specific heat
200 x 4.184
Heat capacity of water = 836.8 J/degree Celsius
Final temperature = (heat absorbed by water ÷ heat capacity of water) + Initial temperature
Final temperature = (154400 ÷ 836.8) + 22
Final temperature = 218.1°C
Q = mcΔT
836.8 J/°C = 325 × c × (427°C - 218.1°C)
836.8 J/°C = 325 × c × 208.9
c = 836.8/(325 × 208.9)
c = 836.8/67,892.5
c = 0.0123 J
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What happens when light hits the pigment in photosystem II?
Answer:
The most common and abundant pigment is chlorophyll a. A photon strikes photosystem II to initiate photosynthesis. Energy travels through the electron transport chain, which pumps hydrogen ions into the thylakoid space. This forms an electrochemical gradient.
What is the density (using proper sig figs) of a rock with a volume of 6.7 mL and a mass of 12.34 grams?
Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property. Therefore, the density of a rock with a volume of 6.7 mL and a mass of 12.34 grams is 1.841g/ml.
What is density?Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water.
Mathematically,
Density of rock = Mass of the rock ÷volume marked on the graduated cylinder
volume of rock= 6.7 mL
mass of rock= 12.34 grams
Substituting all the values in above formula, we get
Density of rock= 12.34 grams÷6.7 mL
=1.841g/ml
Therefore, the density of a rock with a volume of 6.7 mL and a mass of 12.34 grams is 1.841g/ml.
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Thymine and adenine form a base pair in the DNA molecule. These two bases can form a connection between two strands of DNA via two hydrogen bonds. Which of the following diagrams shows the correct representation of the hydrogen bonding (denoted by dashed lines) between thymine and adenine base pairs? (In each diagram. thymine is shown at the left and adenine is shown at the right. The bases are attached to the backbone portion of the DNA strands.)
The diagram on the right shows the correct representation of the hydrogen bonding between thymine and adenine base pairs.
What is thymine?Thymine is one of the four nitrogenous bases found in DNA. It is a pyrimidine base that pairs with Adenine in DNA to form a base pair. Thymine is essential for the proper replication and expression of genetic information and is the only base that bonds with Adenine in DNA. By forming base pairs, thymine helps to maintain the structure of DNA. It also helps to prevent errors in replication and transcription. Thymine is also found in RNA, but instead of bonding with Adenine, it bonds with Uracil.
The hydrogen bonds form between the nitrogenous bases of the two complementary strands of DNA. The thymine molecule has two hydrogen atoms that bind to the nitrogen atom of the adenine molecule. The adenine molecule has two hydrogen atoms that bind to the nitrogen atom of the thymine molecule. This creates a strong link between the two strands of DNA, which is essential for the replication of the genetic material.
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like tobacco smoke, the aerosol given off by an e-cigarette can contain dangerous chemicals.
Yes, the aerosol given off by an e-cigarette can contain dangerous chemicals, such as nicotine, ultrafine particles, volatile organic compounds, and heavy metals.
Inhaling these chemicals can increase the risk of lung and heart disease.
E-cigarettes are becoming increasingly popular as an alternative to tobacco-based cigarettes. However, many people are unaware of the potential dangers associated with using e-cigarettes. The aerosol produced by e-cigarettes can contain not only nicotine, but also other chemicals and particles that can be harmful to the user’s health. These include ultrafine particles, volatile organic compounds, and heavy metals such as lead and nickel.
When these particles and chemicals are inhaled, they can cause inflammation and irritation of the lungs and airways, leading to a variety of respiratory illnesses.
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a noticeably different form or state of the substance
Phase is a a noticeably different form or state of the substance. When energy is added to or removed from a system, matter can change states.
What is state of matter?Solids, liquids, gases, but also plasma are the four states of matter that may be found in daily life. However, a number of additional states of matter have been found. Some of these additional states are created when a material transitions among 2 states of matter and doesn't actually exhibit the characteristics of either state.
When energy is added to or removed from a system, matter can change states. This energy often originates from changes in temperature or pressure. Phase transitions or phase changes occur when matter changes states. Phase is a a noticeably different form or state of the substance.
Therefore, phase is a a noticeably different form or state of the substance.
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Calculate the mass of water needed to prepare 45 g of salt solution if the salt content in the solution is 12%.
The mass of water needed to prepare 45 g of salt solution if the salt content in the solution is 12% is 330g.
The solute is the thing that needs to dissolve, and the solvent is the thing that needs to dissolve it. With a wide variety of solutes and solvents, solutions can be created. We are aware of a wide range of solutions.
Given,
Mass of the salt solution (Solute) = 45g
salt content in the solution = 12%
Let Mass of water = x
Total mass of solution = 45 + x
Concentration of solution = Mass of solute / Mass of Solution × 100
⇒ 12 = 45 / 45 + x × 100
⇒ 12/100 = 45 / 45 + x
⇒ 0.12 = 45 / 45 + x
⇒ 0.12 (45 + x) = 45
⇒ 5.4 + 0.12x = 45
⇒ 0.12x = 45 - 5.4
⇒ x = 330g
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help me, it’s pretty easy science moon stuff !
Which of thee would NOT
be conidered a biome?
A. A region that ha everal grouping of
the ame plant communitie. B. A region that ha everal grouping
of the ame animal communitie. C. A mall habitat that contain it own
ecoytem (uch a a tree tump). D. A large area of the Earth that ha a
imilar climate
A large area of the Earth that has a similar climate is not considered a biome.
Hence, option D is correct.
Scientists can identify a biome by defining the range of temperatures, the kind of soil, the amount of light, and the amount of water that are distinctive to that location. These factors create niches for particular species.A biome is a community made up of all the habitats in a given region and climate, whereas a habitat is the place where a group of one type of organism (a population) resides. Different creatures live in many types of biomes.Scientists disagree on the exact number of biomes that exist on earth, therefore we will focus on the six most significant ones: freshwater, marine, desert, forest, grassland, and tundra.
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What element was oxidized and reduced in this reaction and what is the oxidizing and the reducing agent for this reaction? Au(NO3)3 + Cu ——> Cu(NO3)2 + Au
Answer: Cu is oxidized while Au is reduced. The oxidizing agent is Au while the reducing agent is Cu
Answer:
Both blanks are "Ag"
(:
Explanation:
What is true of a chemical reaction?a. Products and reactants must be balanced.
b. Subscripts must be used with all products and reactants
c. Energy must be included in the beginning of the reaction
d. Coefficients must be used with all products and reactants
Answer: The product and reactant must be balanced
Explanation:
How many ATP does glycolysis produce 4 ATP?
Energy is released when glycolysis occurs, and this energy is utilized to create four molecules of ATP. As a result, glycolysis produces a net gain of two ATP molecules.
What is glycolysis?The metabolic mechanism that transforms glucose to pyruvate is known as glycolysis. This free energy is utilized to create the high-energy molecules adenosine triphosphate and reduced nicotinamide adenine dinucleotide. Glycolysis is a series of 10 enzyme-catalyzed processes. The initial stage in the breakdown of glucose to extract energy for cellular metabolism is glycolysis. Glycolysis is divided into two phases: energy-requiring and energy-releasing. Glycolysis is the process of breaking down glucose to create energy. It generates two pyruvate molecules, ATP, NADH, and water. The process occurs in a cell's cytoplasm and does not require oxygen. It can be found in aerobic and anaerobic organisms.
Here,
When glycolysis happens, energy is released, and this energy is used to build four molecules of ATP. As a result of this, glycolysis generates a net gain of two ATP molecules.
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What is cohesion? Water molecules sticking to other types of molecules Water molecules sticking to other water molecules
Answer:
Water molecules sticking to other water molecules
Explanation:
Each water molecule can form four hydrogen bonds with neighbor molecules. The surface tension produced by cohesion makes it possible for light objects to float on water without sinking (e.g., water striders walking on water).
Is meter stick used in sewing?
Measuring fabric is one purpose for this wooden metric and meter stick that is perfect for many different applications.
Often employed in the construction business, a meterstick, metrestick, as well as yardstick refers to a straightedge or even a foldable ruler was using to measure length. They were frequently built of plastic or wood, with metal as well as plastic joints which enable folding.
A sewing or seam gauge would be a compact but helpful instrument for gauging tiny distances. The spaces needed for buttonholes as well as buttonhole spacing can also be measured using the sewing gauge, along with hemlines, tucks, as well as pleats.
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Matter with a ___ luster reflects little light from its surface.
Fill the blank
Matter with a Dull luster reflects little light from its surface.
Minerals with dull luster reflect very little light.
What is Luster?The term "luster" refers to the light reflection from a mineral's surface. To define lustre, mineralogists use specific terminology. The mineral's metallic or non-metallic nature can be used to categorise lustre in a straightforward manner. Metallic lustre can be seen in opaque, sparkling minerals like pyrite. Quartz is one example of a mineral with a non-metallic shine.
Metallic lustre denotes a sheen akin to polished metal. Clean, polished chunks of chrome, steel, titanium, copper, and brass, as well as many other minerals, all have a metallic shine. The most prevalent nonmetallic lustre is glassy, which denotes that the mineral's surface reflects light like glass. The most typical sort of mineral, feldspars, must have a pearly shine to be recognised. Similar to how pearls reflect light, pearly lustre describes a delicate iridescence or colour play in the reflected light. To reflect light with a silky sheen is to be silky. The sheen of hardened bacon fat is comparable to that of grease.Light is reflected relatively little by minerals with a poor sheen. It takes a little practise to spot lustre. Keep in mind to separate shine from colour.What is Dull Luster?Due to their coarse granulations, which scatter light in all directions and resemble a Lambertian reflector, dull (or earthy) minerals have little to no shine. Kaolinite is one Example.
Different types of non-metallic lusterLuster Appearance
Adamantine Sparkly
Earthy Dull, clay-like
Pearly Pearl-like
Resinous Like resins, such as tree sap
Silky Soft-looking with long fibers
Vitreous Glassy
What are Minerals?Minerals are inorganic solids that exist in nature and have a distinct chemical composition and crystal lattice structure. Even though thousands of minerals in the earth have been found, only ten minerals—plagioclase, quartz, orthoclase, amphibole, pyroxene, olivine, calcite, biotite, garnet, and clay—make up the majority of the crust's volume.
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The photoelectron spectrum for the element nitrogen is represented above. Which of the following best explains how the spectrum is consistent with the electron shell model of the ato
f the atom?
A. The leftmost peak represents the valence electrons.
B. The two peaks at the right represent a total of three electrons.
C. The electrons in the ls sublevel have the smallest binding energy
D. The electrons in the 2p sublevel have the smallest binding energy
The electrons in the 2p sub level have the smallest binding energies, which is the best explanation for how the spectrum is consistent with the electron shell model of the atom. Option D is correct as a result.
Photoemission spectroscopy, often referred to as photoelectron spectroscopy, measures the amount of energy emitted by electrons from solids, gases, or liquids via the photoelectric effect. This procedure involves getting the energy for the electrons from an outside source, such as sunlight.
The photoelectric effect is a process in which electrons receive energy from an external source, such as sunlight, become excited, and transition from the ground state to the excited state. As a result of this process, there is a constant flow of electrons, which in turn causes a flow of energy.
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Please help, no link please.
Answer:
C if not A
Explanation:
3. What volume would be occupied by 3.5 mol of oxygen gas at a pressure
of 768 mm Hg and a temperature fo 25°C?
SHOWING WORK
NO FILES PLZ
Answer:
The oxygen will occupied 84.7 L.
Explanation:
Ideal gases are a simplification of real gases that is done to study them more easily. It is considered to be formed by point particles, do not interact with each other and move randomly. It is also considered that the molecules of an ideal gas, in themselves, do not occupy any volume.
The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:
P*V = n*R*T
where P is the gas pressure, V is the volume that occupies, T is its temperature, R is the ideal gas constant, and n is the number of moles of the gas. The universal constant of ideal gases R has the same value for all gaseous substances.
In this case:
P= 768 mmHgV= ?n= 3.5 molR= 62.36 [tex]\frac{mmHg*L}{mol*K}[/tex]T= 25 C= 298 K (being 0 C= 273 K)Replacing:
768 mmHg* V= 3.5 mol* 62.36 [tex]\frac{mmHg*L}{mol*K}[/tex] *298 K
Solving:
[tex]V=\frac{3.5 mol*62.36\frac{mmHg*L}{mol*K}*298 K }{768 mmHg}[/tex]
V= 84.7 L
The oxygen will occupied 84.7 L.
A 35.2-mL, 1.66 M KMnO 4 solution is mixed with 16.7 mL of 0.892 M KMnO 4 solution. Calculate the concentration of the fi nal solution.
The concentration of the final solution is 1.41[tex]\frac{mol}{L}[/tex].
Now, first calculate the number of moles of first solution:
[tex]M_{1} =\frac{no. of moles of solution}{total volume of solution}[/tex]
no. of moles we have to find
total volume is 0.0352L and molarity of solution is 1.66M
The total number of moles of solute present in a given solution per litre is known as its molarity. In contrast to mass, which varies as the system's physical circumstances vary, the volume of a solution changes as a function of changes in the system's physical qualities, such as pressure and temperature. This has an impact on the molality of the solution. The symbol M, sometimes known as a molar, denotes molarity.
[tex]1.66=\frac{n}{0.0352}[/tex]
on solving we get,
n=0.0584 mol
Now, find the number of moles of second solution by the same formula used to find the moles of first solution,
molarity of second solution is 0.892M and total volume is 0.0167L
Now, put the values in the formula,
[tex]0.892=\frac{m}{0.0167}[/tex]
On solving we get,
m=0.0149 mol
and to find the concentration of new solution number of moles is equal to the sum of moles of first solution and second solution.
x=m+n
x=0.0584+0.0149
x=0.0733 mol
Now, molar concentration is,
[tex]M=\frac{x}{V}[/tex]
[tex]M=\frac{0.0733}{0.352+0.0167}[/tex]
On solving we get,
M=1.41[tex]\frac{mol}{L}[/tex]
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What ion will Magnesium form?
We observe that 0.123 mole of the element bromine combines with 0.123 mole of the element lead to form a compound. What is the empirical formula for the compound?
The empirical formula of the compound with 0.123 moles of bromine and 0.123 moles of lead would be PbBr.
Empirical formula determinationThe empirical formula of a compound is the chemical formula of the compound where the component atoms are in their simplest, whole-number ratios.
In this case, the compound contains bromine and lead:
Br = 0.123 mole
Pb = 0.123 mole
Dividing through by the smallest mole
Br = 0.123/0.123 = 1
Pb = 0.123/0.123 = 1
Thus, bromine and lead are present in a 1:1 ratio in the chemical formula.
In other words, the empirical formula of the compound containing 0.123 moles of bromine and 0.123 moles of lead is PbBr.
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Indicate whether each of the following molecules is capable of geometrical (cis-trans) isomerism. Check all that apply. O 1,3-dichloro-2-butene O 1,4-dichlorobenzene O 1,1-dichloro-1-butene O 4,5-dimethyl-2-pentyne
1,3-dichloro-2-butene and 1,1-dichloro-1-butene.Geometrical isomerism, also known as cis-trans isomerism, occurs when a molecule has two or more structural isomers that differ in the spatial arrangement of the atoms.
Cis-trans isomerism is only possible when the molecule has at least one carbon-carbon double bond. In this type of isomerism, the two isomers differ in the orientation of the substituent groups around the double bond. 1,3-dichloro-2-butene and 1,1-dichloro-1-butene both contain a carbon-carbon double bond and are therefore capable of geometrical isomerism. 1,4-dichlorobenzene does not contain a carbon-carbon double bond and therefore is not capable of geometrical isomerism. 4,5-dimethyl-2-pentyne also does not contain a carbon-carbon double bond and is therefore not capable of geometrical isomerism.
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b. The heat of reaction for the process described in (a) can be determined by
applying Hess's law. The heats of reaction shown in the table below can be
obtained experimentally or looked up in tables of enthalpy data. Which two of
these heats of reaction would be the easiest and safest to measure in the
laboratory, and which two are better obtained through reference sources?
Why? Hint: Consider whether a reaction takes place in aqueous solution or
instead involves noxious gases.
Answer: I believe the 1st and 3rd reactions are better obtained through reference sources and the 2nd and 4th are easiest and safest to measure in the laboratory.
Explanation:
I am also working on this Pre-lab right now, and I looked back at the first question to help get my answer. In the first question (a), it is noted that ammonia gas and gaseous hydrochloric acid are both potentially dangerous in gaseous form. I saw that both the 1st and 3rd reactions contained noxious gases (I knew this because there was a (g) in both of these reactions). Using the knowledge from the first question that the noxious gases were potentially dangerous, I assumed that those reactions were the ones that are better obtained through the reference sources. The 2nd and 4th reactions did not contain any noxious gases, so I assumed those ones were easiest and safest to measure in the laboratory. Hope this helps!
Eighth grade > F.5 Compare physical and chemical changes B6V What do these two changes have in common? burning food on a stove deep-frying chicken Select all that apply. Both are only physical changes. Hoth are chemical changes. Both conserve mass. Both are caused by heating.
Answer:
both are caused by heating
Which of the following statements correctly identifies the decomposition reaction and describes a substance involved
Option C. Decomposition reaction: a substance involved is oxygen.
A decomposition reaction is a type of chemical reaction in which a single compound breaks down into two or more simpler substances.Decomposition Reaction Involving OxygenA decomposition reaction is a type of chemical reaction where a single compound is broken down into two or more simpler substances. In the reaction, energy is typically used to break down the bonds that hold the molecules of the compound together. Oxygen is often a substance involved in the reaction, as it is used to provide the energy needed to break down the compound. When oxygen is involved, the reaction is sometimes referred to as an oxidation reaction.
Since the question is not complete, here's the full task:
Which of the following statements correctly identifies the decomposition reaction and describes a substance involved?
Choose the right option:
A. Combustion reaction: a substance involved is oxygen
B. Combustion reaction: a substance involved is a hydrocarbon
C. Decomposition reaction: a substance involved is oxygen
D. Decomposition reaction: a substance involved is a hydrocarbon
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