The resulting pressure of nitrogen is 50 kPa.
Use Boyle's Law (the pressure volume law).
According to this law - volume of a given amount of gas held varies inversely with the applied pressure when the temperature and mass are constant.
p₁V₁ = p₂V₂
V₁ = 10 m³; initial volume of nitrogen gas
p₁ = 125 kPa; initial pressure of nitrogen gas
V₂ = 25 m³; final volume of nitrogen gas
p₂ = ?; final pressure of nitrogen gas
125 kPa × 10 m³ = p₂ × 25 m³
p₂ = (125 kPa × 10 m³) ÷ 25 m³
p₂ = 50 kPa
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Which kind of change is NOT an indicator of a chemical reaction?
Color. A substance's changing color does not always mean that something has changed chemically. For instance, altering a metal's color does not alter its physical characteristics.
What is not a chemical reaction?A substance's shape is a physical attribute, and any modification of a physical property cannot be interpreted as a sign of a chemical modification.
In essence, a physical change does not result in the creation of a new material, whereas a chemical change does.
While undergoing a physical change, a material may change shape or form, but no chemical processes take place, and no new compounds are created.
Therefore, a change in color is not a sign of a chemical reaction.
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A current of 3.95 a is passed through a ni(no3)2 solution. how long, in hours, would this current have to be applied to plate out 8.90 g of nickel?
1.64 hours will be taken to plate out 8.90g of nickel.
Nickel (Ni), is a chemical element and Group 10 ferromagnetic metal with high resistance to oxidation and corrosion. Although nickel is more important either as a pure metal or in the form of alloys for its various home and industrial applications, it is also known for being silvery white, robust, and tougher than iron.
Iron and the element nickel extremely seldom co-occur in terrestrial and meteoric deposits. Baron Axel Fredrik Cronstedt, a Swedish chemist and mineralogist, separated the metal in 1751 after preparing an impure sample from an ore containing niccolite. Earlier, a similar ore of this kind was given the nickname Kupfernickel in honor of "Old Nick" and his naughty gnomes because, while looking like copper ore, it produced a brittle, foreign metal.
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Which is not evidence of a chemical change?
New odor present
Gas forming
boiling water
Bright light emitted
Answer:
Boiling Water
Explanation:
Boiling water is a physical change because the gaseous water produced is chemically identical to the liquid water i.e both of them have the same molecular structure of the water
SI CONVERSIONS CHEMQUIZ (please help i tried on my own and got 4/10 teacher did not explain conversions well)
The following are the results of the unit conversions as shown in the question;
1) 43900 Pa
2) 71.3 Pa
3) 5.36 * 10^-3 L
4) 0.586 g
5) 9.37 * 10^-7 L
How do you carry out conversions?We know that conversion from one unit to another is performed by the use of conversion factor. We know that we could carry out these conversions from one unit to another in order to improve the ease at which we are able to perform a calculation.
We know that dimensions are very important when we are trying to effect the conversion. Let us now try to effect each of the conversions as shown;
1) 4390000 * 1 Pa/100c Pa = 43900 Pa
2) 0.0713 kPa * 1000 Pa/1 KPa = 71.3 Pa
3) 53.6 dL * 1 L/10000 dL = 5.36 * 10^-3 L
4) 586 mg * 1 g/1 * 10^3 = 0.586 g
5) 0.937 μL * 1 L/1 * 10^6 μL = 9.37 * 10^-7 L
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A block of lead has dimensions of 5.50 cm by 6.20 cm by 8.00 cm. The block weighs 1587.g.
From this information, calculate the density of lead.
A block of lead has dimensions of 5.50 cm by 6.20 cm by 8.00 cm. The block weighs 1587g. The density of lead is 11.30 g/cm³.
What is density?Density is a scalar quantity. It is calculated by dividing mass by volume.
Given, Length = 4.50 cm
Width = 5.20 cm
Height = 6.00 cm
Mass of lead = 1587 g
First, calculate the volume
Volume = l x b x h
Volume = 4.50 x 5.20 x 6.00
Volume = 140.4 cm³
we calculate the density of lead
1587 / 140.4 =
Density = 11.30 g/cm³
Therefore, the density of lead is 11.30 g/cm³.
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What sets noble gases apart from other groups on the periodic table?
Answer:
Noble gases are the least reactive of all elements. That's because they have eight valence electrons, which fill their outer energy level. This is the most stable arrangement of electrons, so noble gases rarely react with other elements and form compounds.
5
A yo-yo have the most potential energy at
Its:
A Highest point
B Lowest point
C Midpoint
D Top speed
Answer:
a. highest point
Tom adds solid sodium hydroxide to a flask of water at room temperature. After he stirs the water, some of the
sodium hydroxide dissolves, however, a small amount of sodium hydroxide still remains at the bottom of the flask.
He heats the flask of sodium hydroxide and water for 10 minutes, and the sodium hydroxide on the bottom of the
flask disappears. How does heating the water cause the remaining sodium hydroxide to disappear?
Answer: It has a lower boiling/melting point than the water
In+an+industrial+process,+nitrogen+is+reacted+with+hydrogen+to+produce+ammonia.+the+percent+yield+of+this+particular+process+is+22.4%.+how+much+hydrogen+is+needed+to+produce+3.3+kg+ammonia?
Hydrogen of mass of 2.625kg is required to produce 3.3kg of ammonia.
The mass of a physical body is a measure of its entire makeup. Inertia, or the body's opposition to acceleration when a cumulative force is applied, is also measured by this term. The strength of a body's gravitational pull on other bodies is also influenced by its mass. In an ionic crystal, formula mass is the total atomic mass of all the atoms that make up the formula unit. The amount of a material that is equivalent to its molecular mass in grams is referred to as its molar mass. Usually, It is measured in grams (g) or kilograms (kg).
Given:
Mass, m of [tex]NH_3[/tex] = 3.3kg
Molar mass, mm of [tex]NH_3[/tex] = 17g/mol
To find:
Mass of [tex]H_2[/tex] = ?
Reaction:
[tex]N_2 (g) + 3H_2 (g) \rightarrow 2NH_3 (g)[/tex]
Formula:
[tex]nNH_3[/tex] = mass/molar mass
moles of N, [tex]nN = \frac{nNH_3}{\% yield}[/tex]
moles of H = [tex]\frac{3}{2} nN[/tex]
mass of H = moles of H x molar mass of H
Calculations:
n = 3300 / 17
n = 194.12 mol
moles of N, nN = 194.12 / 0.224
nN = 866.61 mol
1 mol required [tex]\frac{3}{2}[/tex] mol [tex]NH_3[/tex]
moles of H, nH = [tex]\frac{3}{2} * 866.61[/tex]
nH = 1299.92 mol
mass of hydrogen, m = 1299.92 x 2.02
m = 2625.84g
m = 2.625kg
Result:
The mass of hydrogen required is 2.625kg.
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Azt, used in the treatment of aids, has the following structure. what is the molecular formula for azt? c9h14n5o4 c9h9n5o4 c9h12n5o4 c10h13n5o4 c11h12n5o4
Hence , the molecular formula for azt is C₁₀H₁₃N₅o₄ which is option (d) .
The full type of nucleoside reverse transcriptase inhibitor may be azidothymidine that is additionally known as as AZT is a sort of drug that is employed to delay the event of AIDS within the patients that area unit laid low with HIV(human immunological disorder virus). The cluster of medicine from wherever nucleoside reverse transcriptase inhibitor belongs is thought as glycoside polymerase inhibitors.The formula is associate in nursing expression that defines the amount of atoms of every component in one molecule of a compound.It shows the particular variety of every atom in a very molecule.The molecular formula for azt is C₁₀H₁₃N₅o₄
In this formula, there area unit 10 carbon atoms and 13 H atoms and 5 nitrogen atoms and 4 oxygen atoms within the given compound.
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What is the most abundant isotope of Iridium (Ir)?
Question 1 options:
Iridium-77
Iriduium-192
Iridium192.22
The most abundant isotope of iridium is Iriduium-192.
What is the most abundant isotope?An element is composed of isotopes. The isotopes of an elements have different mass numbers but the same atomic number. These difference in the mass number is caused by differences in the number of neutrons.
Hence, we can see that all elements do have isotopes. The chemical and physical properties of isotopes may be the same save that the rate of reaction of the individual isotopes may slightly differ. The most abundant isotope has the highest length in the mass spectrum.
We can see that there are three isotopes of Iridium that are common. The most abundant isotope of iridium is Iriduium-192.
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What are the key factors that determine the stability of a nucleus? select all that apply.
The key factors that determine the stability of a nucleus are neutron /proton ratio and total number of nucleons in the nucleus.
How to determine nuclear stability?Nuclear stability is determined by neutron/proton ratio and the total number of nucleons.Stable nuclei with atomic numbers up to 20 have neutron/proton ratio of about 1/1.
For elements above atomic number 20 the number of neutrons is always greater than the number of protons which are present along with neutrons in the nucleus of an atom.Such atoms are called stable isotopes.
No nucleus having number of nucleons greater than 208 is stable. This arises due to the fact when the nuclear force becomes 100 times , it operates only on very short distances .
When the nucleus attains a certain size,the strong force of attraction is no longer capable of holding the nucleus together.
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Question 6 (5 points)
Assume that Element Q has the following three isotopes: 248Q,
252Q, and 259Q. If the atomic mass of Q is 258.63, which of its
isotopes is most abundant?
Complete the following:
4
. Make a claim that answers the question
Support your answer with evidence from the information
given
• Explain your reasoning
●
The most abundant isotope here is 259Q.
What are isotopes?We know that isotopes refers to those atoms of elements that have the same atomic number but different mass numbers. The reason for the difference in the mass number is because they do not have the same number of neutrons. Recall that the mass number is the sum of the number of protons and neutrons in the nucleus of an atom.
The existence of isotopy is the reason why the relative atomic masses of elements are not whole numbers.
Note that the isotopes are not abundant to the same extent. The isotopes that are are more abundant tend to affect the value of the relative atomic mass. The relative atomic mass is nearest in value to the mass of the most abundant individual isotope.
As such, the most abundant isotope here is 259Q.
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What is the major organic product that results when hept-1-yne is treated with 2 equivlents of hbr
The major organic compound is 2,2-dibromoheptane.
Any of a vast group of chemical compounds known as organic compounds contain one or more carbon atoms that are covalently connected to atoms of other elements, most frequently hydrogen, oxygen, or nitrogen. Carbides, carbonates, and cyanides are among the few carbon-containing substances that aren't categorized as organic.
Organic compounds make up about one-third of all industrially manufactured substances. Organic compounds make up the majority of foods, medications, clothing fibers, and plastics, as well as all living things. Many different fields can benefit from the identification of organic molecules. Scientists have just created a new technique dubbed "material degradomics" to track the deterioration of antiquated books and historical artifacts. Paper develops the well-known "old book smell" when it ages due to the emission of organic chemicals in gaseous form.
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Using standard reduction potentials from the aleks data tab, calculate the standard reaction free energy for the following redox reaction. 3fe2 cro42- 4h20
The standard Gibbs free energy for the given redox reaction is -106kJ/mol.
What is the standard Gibbs free energy?
The standard Gibbs free energy (ΔG°) is a thermodynamic potential that can be used to calculate the maximum reversible work that may be performed by a thermodynamic system under standard conditions.
To find the Gibbs free energy, first we have to know about the redox reaction,
10 Cl⁻(aq) + 2 MnO₄⁻(aq) + 16 H⁺(aq) ⇒ 5 Cl₂(g) + 2 Mn²⁺(aq) + 8 H₂O(l)
As we have to analyze the standard reduction potentials (E°red).
Cathode: 2 MnO₄⁻ + 16 H⁺ + 10 e⁻ ⇒ 2 Mn²⁺ + 8 H₂O
E°red = 1.51 V
Anode: 10 Cl⁻ ⇒ 5 Cl₂ + 10 e⁻
E°red = 1.40 V
Then, the potential difference between the cathode and anode is called the standard cell potential.
E°cell = E°red, cathode - E°red, anode
= 1.51 V - 1.40 V
= 0.11 V
The standard cell potential is 0.11 V.
The Gibbs free energy can be calculated as,
ΔG° = - n × F × E°cell
ΔG° = - 10 mol × (96,485 J/V.mol) × 0.11 V × (1 kJ/1000 J)
= -106 kJ/mol
where,
n - moles of electrons exchanged.
F -Faraday's constant.
The standard Gibbs free energy for the given redox reaction is -106kJ/mol.
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How can electrical conductivity be used to determine bond type? (In your CER make sure to also explain why different bonds behave differently) 1 claim 3 reasoning and 3 evidence
Electrical conductivity can be used to determine the bond type because there are valence electrons that are not able to conduct electricity while free electrons can conduct electricity.
What are valence electrons and free electrons?The valence electrons can be defined as those having a negative charge that are linked to atomic particles, while the free electrons do not form atomic particles in the sense they are unbound to atomic particles.
In conclusion, electrical conductivity can be used to determine the bond type because there are valence electrons that are not able to conduct electricity and while free electrons can conduct electricity.
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Apply the law of conservation of energy to explain how energy is conserved when water evaporates.
"Energy can be neither created nor destroyed but can only be converted from one form to another" In the above case liquid is converted to gas keeping the mass of the molecules the same. The energy lost while evaporating is conserved.
Explain the law of conservation of energy.The water evaporates into water vapor, where the total water molecules remain the same, the molecules are just spread out over a greater volume but the mass remains the same.
Evaporation occurs when a molecule gains or loses energy, and it exists in the form of heat. This is how the energy is conserved during evaporation.
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&
What correctly describes the molecules in very dilute sugar solution at
room temperature?
Widely separated, moving at random describes the molecules in very dilute sugar solution at room temperature.
Sugar dissolve in room temperature water :This is attributable to the fact that sugar is soluble in liquid water under all conditions of pressure and temperature. From about 180g of sugar in 100ml of water at 0 degrees to about 490g in 100ml of water at 100 degrees, the solubility of sugar does increase with temperature. As the saturated concentration rises, the solution will become unsaturated. Temperature increases the solubility.
Do sugar dissolve in cold liquid?In general, sugar dissolves more readily at higher temperatures than it does at lower ones. Because the molecules in hot water (or coffee) move more quickly and are spaced farther apart, the sugar can mix with them more easily. In fact, sugar is very soluble; it just isn't at lower temperatures.
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After an animal takes in nutrients to make needed materials what is the best explanation for what the cell will do next in order to maintain homeostasis
There are three primary ways that the animal cell membrane keeps things in balance: enabling the membrane to flow fluidly, controlling the process by which water moves from a high concentration to a low concentration, and maintaining particular ion concentrations.
Negative feedback loops keep homeostasis in check. Positive feedback loops may be necessary for life to exist even when they actually push the organism further away from homeostasis. The neural and endocrine systems of mammals regulate homeostasis.
For instance, an animal must use the thermoregulation mechanism to control body temperature. Cold-adapted organisms, like the polar bear, have physical characteristics that enable them to survive extreme cold and retain body heat. Fur, feathers, blubber, and fat have structures that help with this kind of insulation.
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Which statement best describes the difference between dissolution and melting? (1 point)
O Dissolution involves the formation of a new substance, while melting involves a state change.
O lonic compounds dissolve, while polar compounds melt.
O Polar compounds dissolve, while ionic compounds melt.
O Dissolution involves a state change, while melting involves the formation of a new substance.
The statement which best describes the difference between dissolution and melting is that dissolution involves the formation of a new substance, while melting involves a state change and is denoted as option A.
What is Dissolution?This is the process in which a solute dissolves in a solvent such as water to form a solution thereby resulting in a new substance being created.
Melting on the other hand is the process in which a solid phase is changed into a liquid phase with the application of heat which makes the atoms move more freely.
This is therefore the reason why option A was chosen as the most appropriate choice.
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Please help, this is due tomorrow and I don’t understand.
The accepted value for the
density of iron is 7.874
g/cm^3. Give two examples
of a measurement for density
that would be accurate?
it can change everything
The Cullinan diamond, the largest diamond ever found, had an uncut volume of 177 mL. If 1 mL
of diamond has a mass of 3.51 g and 1 carat= 0.200 g, how many carats was the Cullinan
diamond?
If 1 mL of diamond has a mass of 3.51 g and 1 carat = 0.200 g, cullinan diamond is of 2795.7 carats.
The atoms of diamond are grouped in a crystal structure known as diamond cubic, and it is a solid form of the element carbon.The Imperial State Crown, which is used at British monarchs' coronations, was set with Cullinan II, the 2nd biggest stone and the 317-carat Second Star of Africa.The weight of diamonds and other valuable stones is measured in carats. There are 0.2 grams in it.Given,
Volume of uncut diamond is 177mL
1mL = 3.51 gram
and 1 carat = 0.200 gram
then we have to find out weight of cullinan diamond in carats.
Cullinan diamond is of 177mL volume that means
177 × 3.51 = 621.27 grams
If 1 carat = 0.200grams
then 1 gram = 4.5 carats
621.27 grams = 621.27 × 4.5 = 2795.7 carats
Hence, cullinan diamond is of 2795.7 carats.
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How many electrons are in mystery atom Y?
Answer:Diagram of the nuclear composition and electron configuration of an atom of yttrium-89 (atomic number: 39), the most common isotope of this element. The nucleus consists of 39 protons (red) and 50 neutrons (blue). 39 electrons (green) bind to the nucleus, successively occupying available electron shells (rings).
Explanation:Need brainliest award
Answer:
Explanation:
39
A neutral atom has a mass number of 119 and has 69 neutrons. write its isotopic symbol.
The Isotopic symbol of the element that has a mass number of 119 and has 69 neutrons is ₅₀¹¹⁹Sn.
What is atomic number and mass number?Atomic number is the number of protons present in the nucleus of the atom of an element.
The mass number is the sum of the protons and neutrons present in the nucleus of the atom of the element.
The mass number of the element = 119
The neutron number = 69
The atomic number = 119 - 69
Atomic number = 50
The element with atomic number 50 is Tin with symbol Sn.
The Isotopic symbol of the element is ₅₀¹¹⁹Sn.
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What is the angle between the sulfur-bromine bonds? (if there is more than one angle, pick the smallest.
The angle between sulfur-bromine bonds in SBr6 is 90°.
Sulfur hexabromide(SBr6), is a chemical compound with the hybridization of one s orbital, three p orbitals, and two d orbitals.
Hence, the hybridization of the central atom i.e, Sulfur in this compound is sp3d2.
As the compound has a hybridization of sp3d2, its shape is octahedral, as shown in the adjoining image.
As it is visible from the structure of SBr6, all angles between Sulfur and bromine are equal and their value is 90°.
Thus, the angle between sulfur-bromine bonds in SBr6 is 90°.
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Differentiate between element, compound and mixture
A+wooden+boat+discovered+just+south+of+the+great+pyramid+in+egypt+has+a+carbon-14/carbon-12+ratio+that+is+72.0++%++of+that+found+in+living+organisms.+how+old+is+the+boat?++++++++
The approximate age of the boat by radiocarbon dating is 2660 years.
Radiocarbon dating, often known as carbon-14 dating, is a technique for determining an age that relies on radiocarbon's reduction to nitrogen. Neutrons combine with nitrogen-14 in the Earth's atmosphere to form carbon-14, which is a process that occurs frequently in nature. The neutrons needed for this reaction are created when cosmic rays impact the atmosphere.
The radiocarbon found in atmospheric carbon dioxide molecules enters the biological carbon cycle when green plants take it in from the air and then pass it on to animals through the food chain. A living thing's radiocarbon steadily deteriorates, and as long as it consumes food or air, the lost radiocarbon is constantly replaced. However, as an organism passes away, it can no longer take in carbon-14, therefore the amount of radiocarbon in its tissues steadily decreases.
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A 35.00 gram sample of a substance containing only Carbon, Hydrogen and Oxygen was combusted. The products of this combustion reaction were shown to be 51.29 grams of CO2 and 20.99 grams of H2O. Determine the empirical formula of the original compound given this combustion analysis data.
The empirical formula of the original compound given the combustion analysis data is CH₂O
How to determine the mass of Carbon Mass of CO₂ = 51.29 gMolar mass of CO₂ = 44 g/mol Molar of C = 12 g/mol Mass of C =?Mass of C = (12 / 44) × 51.29
Mass of C = 13.99 g
How to determine the mass of HMass of H₂O = 20.99 gMolar mass of H₂O = 18 g/mol Molar of H = 2 × 1 = 2 g/mol Mass of H =?Mass of H = (2 / 18) × 20.99
Mass of H = 2.33 g
How to determine the mass of OMass of compound = 35 gMass of C = 13.99 gMass of H = 2.33 gMass of O =?Mass of O = (mass of compound) – (mass of C + mass of H)
Mass of O = 35 – (13.99 + 2.33)
Mass of O = 18.68 g
How to determine the empirical formula C = 13.99 gH = 2.33 gO = 18.68 gEmpirical formula =?Divide by their molar mass
C = 13.99 / 12 = 1.1658
H = 2.33 / 1 = 2.33
O = 18.68 / 16 = 1.1675
Divide by the smallest
C = 1.1658 / 1.1658 = 1
H = 2.33 / 1.1658 = 2
O = 1.1675 / 1.1658 = 1
Thus, the empirical formula of the compound is CH₂O
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Carbon is essential to the structure of every organic compound.
a. true
b. false
answer:
a. true
explanation:
carbon is found in all organic compounds; it's the main compound. it's essential to life and without it earth would be nonexistent.
Choose the terms that correctly complete the paragraph.
Mr. Tracy drove to the nursery to buy plants for his garden. His trip involved several examples of chemical energy. The chemical energy contained in {Blank} changed into energy to run the car. The plants store chemical energy produced during {Blank} . Mr. Tracy had the energy to pick up the plants and carry them to the car because of the chemical energy stored in {Blank} .
The chemical energy contained in gas changed into energy to run the car. The plants store chemical energy produced during photosynthesis. Mr. Tracy had the energy to pick up the plants and carry them to the car because of the chemical energy stored in foods.
Energy conversion in systemsMr. Tracy drove to the nursery to buy plants for his garden. While driving, the chemical energy stored in the gas present in the gas tank in his car is burned to produce energy that drives the engine of the car.
The plants that Mr. Tracy was going to buy store chemical energy through the production of carbohydrates via the process of photosynthesis. Mr. Tracy had the energy to pick up the plants and carry them to the car because of the energy stored in foods.
The foods are oxidized during respiration to unlock the energy and convert them to usable energy by the body, usally in the form of ATP. Respiration involves series of steps, including the conversion of glucose to pyruvate molecules and the conversion of the pyruvates to carbon dioxide and water.
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