Answer:
Faster hydrogen burning means the star will grow larger and more luminous to allow the extra energy created to escape
it starts fusing hydrogen in a shell around a helium core.
What is the major different between the particles in a liquid and a gas of the same substance at the same temperature?
a. The particles in the gas are moving faster than the particles in the liquid
b. The particles in a liquid are still connected, but the particles in a gas have separated from each other and now fly around to fill the container
c. The particles in the liquid have higher masses than the particles in the gas
d. The particles the gas are separated, so they absorb less heat than normal, which is why gases are typically cooler than liquids
Answer: a. The particles in the gas are moving faster than the particles in the liquid
How many individual carbon atoms are contained in one mole of carbon? (Input your answer with scientific notation using "e-notation". (For example, the speed of light in m/s is 3.0 x 108; in "e-notation" this is 3.0e8.) Report your answer to two places past the decimal point. Moodle is looking for a number only, no units.)
6.023 ×[tex]10^{23}[/tex] individual carbon atoms are there in one mole of carbon.
Mass of a 1 [tex]C_{12}[/tex] atom= 12 amu
1 amu = 1.66 ×[tex]10^{-27}[/tex] gm
∴ 12 amu =1.99 ×[tex]10^{-21}[/tex] gm
∴Mass of a 1 [tex]C_{12}[/tex] atom=1.99 ×[tex]10^{-21}[/tex] gm
Mass of C in 1 mole = 12 gm
∴Total number of atoms of carbons in 1 mole = 12 ÷ 1.99 ×[tex]10^{-21}[/tex]
∴Total number of atoms of carbons in 1 mole= 6.023 ×[tex]10^{23}[/tex] atoms
6.023 ×[tex]10^{23}[/tex] individual carbon atoms are there in one mole of carbon.
The number 6.023 ×[tex]10^{23}[/tex] is known as Avogadro's number, which represents the number of individual atoms present in a one mole of substance with respect to [tex]C_{12}[/tex] atoms.
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A 1. 07 g sample of a noble gas occupies a volume of 363 ml at 35°c and 678 mmhg. Identify the noble gas in this sample. (r = 0. 08206 l×atm/k×mol)
The identity of the noble gas is the sample is Krypton
Ideal Gas lawFrom the question, we are to determine the identity of the noble gas in the sample
From the ideal gas equation, we have that
PV = nRT
∴ n = PV / RT
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
From the given information,
P = 678 mmHg = 0.892105 atm
V = 363 mL = 0.363 L
R = 0.08206 L.atm/mol.K
T = 35 °C = 35 + 273.15 K = 308.15 K
Putting the parameters into the equation, we get
n = (0.892105 × 0.363)/ (0.08206 × 308.15)
n = 0.0128 moles
Now, we will determine the Atomic mass of the sample
Using the formula,
Atomic = Mass / Number of moles
Atomic mass of the substance = 1.07 / 0.0128
Atomic mass of the substance = 83.6 amu
The noble gas with the closest atomic mass to this value is Krypton.
Molar mass of Krypton = 83.798 amu
Hence, the identity of the noble gas is the sample is Krypton
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2. Metals react with water and release hydrogen gas. Explain why non-metals do not release hydrogen gas when reacted with water.
Answer:
Its because non-metals are unable to break the bond between the H and O ion and cannot reduce hydrogen by donating electrons
How many miles of silver will be generated if 1.30 miles of zinc is placed into silver nitrate solution
2.60 moles.
Zn (s) + 2 Ag+ (aq) --> 2 Ag (s) + Zn2+ (aq), each mole of zinc gives out two moles of silver. Therefore, 1.30 moles of zinc will displace 2.60 moles of silver. ( 1.30 × 2)
More about silver nitrate:
An inorganic substance with the chemical formula AgNO3 is silver nitrate. This salt serves as a flexible base for numerous different silver compounds, including those employed in photography. Compared to halides, it is far less light-sensitive. Lunar caustic was previously the name given to it since early alchemists referred to silver as luna and connected it to the moon.
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A syringe containing 35.0 mL of Xe gas at 298 K has a pressure of 0.980 atm. How many grams of Xe are in the syringe? Report your answer to the nearest 0.001 g
The mass of Xe present in the syringe given the data is 0.183 g
How to determine the mole of Xe Volume (V) = 35 mL = 35 / 1000 = 0.035 L Pressure (P) = 0.980 atm Temperature (T) = 298 KGas constant (R) = 0.0821 atm.L/Kmol Number of mole (n) =?Using the ideal gas equation, we can obtain the mole of Xe as follow:
n = PV / RT
n = (0.98 × 0.035) / (0.0821 × 298)
n = 0.0014 mole
How to determine the mass of XeMole = 0.0014 moleMolar mass of Xe = 131 g/moleMass of Xe = ?Mass = mole × molar mass
Mass of Xe = 0.0014 × 131
Mass of Xe = 0.183 g
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the volume of a 300 L sample of CO2(g) at 2.30 atm is compressed to 29.6 L, what
is the new pressure at constant temperature and moles?
Answer:
23,31 atm
Explanation:
p1v1 = p2v2
2.3 * 300 = p2 *29.6
p2=23.31 atm
Which of the following is the best definition of nuclear fusion?
A. Nuclear fusion is the release of high-energy photons from a
nucleus.
B. Nuclear fusion is the joining of two or more nuclei into one
nucleus.
C. Nuclear fusion is the formation of new isotopes through a gain of
electrons.
D. Nuclear fusion is the splitting of a nucleus into two or more nuclei.
Answer:
B. Nuclear fusion is the joining of two or more nuclei into one nucleus.
The best definition of nuclear fusion : Nuclear fusion is the joining of two or more nuclei into one nucleus.
What is Nuclear reaction ?Nuclear reaction, change in the identity or characteristics of an atomic nucleus, induced by bombarding it with an energetic particle.
The bombarding particle may be an alpha particle, a gamma-ray photon, a neutron, a proton, or a heavy ion.
Nuclear Fusion reactions power the Sun and other stars.
In a fusion reaction, two light nuclei merge to form a single heavier nucleus.
The process releases energy because the total mass of the resulting single nucleus is less than the mass of the two original nuclei. The leftover mass becomes energy.
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the plastic region of the stress-strain curve for a metal is characterized by
The plastic region of the stress-strain curve for a metal is characterized by a proportional relationship between stress and strain.
What is the usefulness of stress-strain curve?Stress-strain curve serves as the curve that help to show the relationship between stress and strain of a particular material especially in engineering.
With these curve the reaction of a material when a load is applied can be known before using the material for construction work.
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Can someone help me please
Answer:D
Explanation:
Use the vertex form, y=a(x−h)2+ky=a(x-h)2+k, to determine the values of aa, hh, and kk.a=14a=14h=6h=6k=1k=1Find the vertex (h,k)(h,k).(6,1)(6,1)Find pp, the distance from the vertex to the focus.Find the distance from the vertex to a focus of the parabola by using the following formula.14a14aSubstitute the value of aa into the formula.14⋅1414⋅14Simplify.Combine 4 and 1/4 .1 /4/4Simplify by dividing numbersDivide 4 by 44.1/1Divide 1 by 1/1.Y=0 The Answer is DWhat is an example of climate?
Answer:
Tropical.Dry.Temperate.Continental.Polar.Explanation:
The tropical climate in the Köppen system is defined as having an average temperature in every month of above 18°C. There is no winter season, and annual rainfall is large and exceeds the annual evaporation. The dry climate regions are characterized by evaporation surpassing the humidity of precipitation. It is represented with the letter "B" in the Köppen climate classification. Precipitation is infrequent and vegetation is scarce in these areas. Temperate climates are generally defined as environments with moderate rainfall spread across the year or portion of the year with sporadic drought, mild to warm summers and cool to cold winters.A relatively dry climate with very hot summers and very cold winters, characteristic of the central parts of Asia and North America. A polar climate consists of cool summers and very cold winters, which results in treeless tundra, glaciers, or a permanent or semi-permanent layer of ice. It is identified with the letter E in the Köppen climate classification.#Let's Study
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[tex]\\ \blue{MaggieEve}[/tex]
The table compares the number of electrons in two unknown neutral atoms.
Comparison of Electrons
Atom Number of Electrons
A9
D11
Use this information to determine the number of valence electrons in the atoms. Which of the following correctly compares the stability of the two atoms?
O Both are unreactive.
O Both are highly reactive.
OA is unreactive and D is reactive.
OA is reactive and D is unreactive.
Answer: Both are highly reactive.
Explanation:
A is fluorine, which only needs to gain one more electron to have a full valence shell. Thus, it is reactive.
D is sodium, which only needs to lose one electron to have a full valence shell. Thus, it is also reactive.
q5:- Some green food colouring was carefully added to the bottom of a beaker of water using a syringe. The beaker was then covered and left untouched for several days.
Describe what would you observe after:-
a)
i) a few hours
ii) several days
b) explain your answer to question 5a using ideas of the kinetic particle theory.
c) state the physical process that takes place in this experiment.
The molecules of the green food coloring would disperse throughout the water.
Diffusioni) In a few hours, the molecules of the green food coloring would have started dispersing throughout the water from the region of higher concentration to the region of lower concentration.
ii) In several days, the molecules would have uniformly dispersed through the water.
b) According to the kinetic theory of particles, matters, irrespective of their nature, are made up of small molecules that are in constant random motion. The direction and pace of movement depend on the energy they possess as well as the kind of relationship that exists between the small molecules.
c)The process that takes place in the experiment is known as diffusion.
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Explain why the Group 1 metals react vigorously with water.
The metals want to have a full outer electron shell, which involves them losing their one outer electron. Therefore, they react vigorously since they have a large desire to remove the electron.
Which term describes this reaction?
Answer:
addition polymerization
Explanation:
Which characteristic of money explains why an old dollar is worth as much as a crisp, new dollar?
The characteristic is uniformity.
Uniformity of moneyMoney is said to be uniform because irrespective of the nature it exists, the same amount must have the same purchasing power.
For example, a dollar in paper form and a dollar in coin form must be able to buy the same 1 dollar worth of goods.
Thus, a dollar bill, irrespective of its age, has the same purchasing power as a new, crisp dollar bill.
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0. 820 mole of hydrogen gas has a volume of 2. 00 l at a certain temperature and pressure. What is the volume of 0. 125 mol of this gas at the same temperature and pressure?
The volume of 0.125 mole of the gas at the same temperature and pressure 0.30 L
Data obtained from the question Initial mole (n₁) = 0.82 moleInitial volume (V₁) = 2 LNew mole (n₂) = 0.125 molePressure = ConstantTemperature = ConstantNew Volume (V₂) =? How to determine the new volumeThe new volume can be obtained as illustrated below
PV = nRT
Divide both side by P
V = nRT / P
Divide both side by n
V / n = RT / P = Constant
Thus,
V₁ / n₁ = V₂ / n₂
2 / 0.82 = V₂ / 0.125
Cross multiply
0.82 × V₂ = 2 × 0.125
Divide both side by 0.82
V₂ = (2 × 0.125) / 0.82
V₂ = 0.30 L
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How many calories are in a
banana containing 410 kJ of
energy?
[? ] cal
Number of calories that are in a banana containing 410 kJ of energy are 97619.04 Calories.
What is Energy?The ability to do work is called as energy. Work done is product of force and displacement. Energy is of different types as sound energy, kinetic energy, potential energy, electrical energy, light energy etc.
Law of conservation of energy states that energy can neither be created nor destroyed, but it can be transferred from one form to another.
Molecules can move so they show kinetic energy, molecules can be there at many positions so they can show potential energy, molecules can vibrate so they can show sound energy but molecules can only absorb light hence they can't have light energy.
1 calorie of energy has 0.0042 Kilo Joules.
97619.04 Calories of energy will be present in 410 KJ.
Therefore, Number of calories that are in a banana containing 410 kJ of energy are 97619.04 Calories.
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Se prepara 0,150dm3 de solucion poh=11,20 a partir de 10,00cm3 de una solucion acuosa de hno3 (( m=63,0g/mol). la concentracion de la solucion concentrada expresada en %m/v es?
Answer:
Translate your language to English ok
a sample of helium gas has a volume of 1.00 l. what is the final volume if both the pressure and kelvin temperature each double?
Since the helium gas has a volume of 1.00 L, the final volume of the helium gas is 1.00 L
To find the volume, we need to know the general gas law.
What is the general gas law?The general gas law is given by P₁V₁/T₁ = P₂V₂/T₂ where
P₁ = initial pressure of gas, V₁ = initial volume of gas, T₁ = initial temperature of gas in Kelvin, P₂ = final pressure of gas, V₁ = final volume of gas, andT₁ = final temperature of gas in KelvinFinal volume of helium gasSo, making V₂ subject of the formula, we have
V₂ = P₁V₁T₂/T₁P₂
Since the sample of helium gas has a volume of 1.00 L and both the pressure and kelvin temperature each double, we need to find its final volume.
So,
P₂ = 2P₁, T₂ = 2T₁ and V₁ = 1.00 LSo, substituting the values of the variables into the equation, we have
V₂ = P₁V₁T₂/T₁P₂
V₂ = P₁V₁ × 2T₁/T₁ × 2P₁
V₂ = V₁
V₂ = 1.00 L
So, the final volume of the helium gas is 1.00 L
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Beverly and Carl are in a race. Their graphs show the data.
A graph with horizontal axis time (seconds) and vertical axis velocity (meters per second). An orange line labeled Beverly starts at 0 seconds 0 meters and goes straight to 10 seconds 15 meters and then to 50 seconds 35 meters. A blue line labeled starts at 0 seconds 0 meters and goes straight to 10 seconds 10 meters and then to 50 seconds 30 meters.
Which best describes the race?
Given the data, the correct statement is
Even though for a majority of the race they accelerated at the same rate, Beverly won because her initial acceleration was greater than Carl’s
What is acceleration?This is defined as the rate of change of velocity which time. It is expressed as
a = (v – u) / t
Where
a is the acceleration v is the final velocity u is the initial velocity t is the time How to determine the initial acceleration of BeverlyInitial velocity (u) = 0 m/sFinal velocity (v) = 15 m/sTime (t) = 10 sInitial acceleration (a₁) =?a₁ = (v – u) / t
a₁ = (15 – 0) / 10
a₁ = 1.5 m/s²
How to determine the final acceleration of BeverlyInitial velocity (u) = 15 m/sFinal velocity (v) = 35 m/sTime (t) = 50 - 10 = 40 sFinal acceleration (a₂) =?a₂ = (v – u) / t
a₂ = (35 – 15) / 40
a₂ = 0.5 m/s²
How to determine the initial acceleration of CarlInitial velocity (u) = 0 m/sFinal velocity (v) = 10 m/sTime (t) = 10 sInitial acceleration (a₁) =?a₁ = (v – u) / t
a₁ = (10 – 0) / 10
a₁ = 1 m/s²
How to determine the final acceleration of CarlInitial velocity (u) = 10 m/sFinal velocity (v) = 30 m/sTime (t) = 50 - 10 = 40 sFinal acceleration (a₂) =?a₂ = (v – u) / t
a₂ = (30 – 10) / 40
a₂ = 0.5 m/s²
SUMMARY
Initial acceleration of Beverly = 1.5 m/s²Final acceleration of Beverly = 0.5 m/s²Initial acceleration of Carl = 1 m/s²Final acceleration of Carl = 0.5 m/s²From the above calculations, we can see that Beverly's initial acceleration is higher than that of Carl's and their final acceleration is the same.
Therefore, the correct answer to the question is:
Even though for a majority of the race they accelerated at the same rate, Beverly won because her initial acceleration was greater than Carl’s
Complete question
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Answer:
B) hope this helped.
-----------------------------
on edgy 2022
Explanation:
The expression caco3 → cao co2 is an example of a reactant. product. chemical equation. chemical progression.
Chemical equation
What is a chemical equation?The reactants and products of a chemical reaction are represented symbolically in a chemical equation by the appropriate chemical formulas.A chemical equation that illustrates how Calcium oxide (quicklime) and carbon dioxide are produced during the breakdown of limestone.CaCo3 → CaO+ CO2 (Decomposition reaction)
The portion of the chemical equation on the reactant side is to the left of the symbol "→," and the portion on the product side is to the right of the arrow symbol.Decomposition reaction:-A chemical reaction that results in the breakdown of one reactant into two or more products is known as a decomposition reaction.
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Answer:
chemical equation
Explanation:
Recall all the models you described in task 1.(Bohr, Rutherford, Thomson, and Dalton) Think about the results each model would predict for Thomson’s experiment. Which atomic models does Thomson’s experimental evidence support? Explain why these models are compatible with the experimental results.
Thomson's experimental data does support the Rutherford model.
What is an atom?The atom consists of matter that may be split without releasing electrical charges.
It's also the smallest unit of matter with chemical element features. As a result, the atom is the fundamental unit of science.
Rutherford was the one who first published the nuclear model of the atom. According to his atomic model, an atom's volume is largely empty,
The center of the atom houses the nucleus, which is made up of protons and neutrons, and its electrons follow certain pathways as they orbit it.
When compared to Rutherford's discoveries, the study of certain other scientists, like Dalton, Neil Bohr, and JJ Thomson, is mostly consistent.
For instance, Dalton's atomic theory assumed that atoms interact to create compounds and are nearly the same size.
Rutherford's theory states that atoms have a finite amount of electrons that may be shared to form compounds.
Rutherford's discoveries, which gave rise to the concept of shells, are also consistent with the Bohr model, which holds that electrons orbit the nucleus in certain shells.
Despite the fact that Rutherford's model was the best atomic model, it nevertheless drew from a number of prior studies and was compatible with their findings.
Hence Thomson's experimental data does support the Rutherford model.
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functions of intercalary meristems
What causes ionic bonding between two atoms?
Answer:
Ionic bonding happens when an atom of an element gives one or more of its electrons to the other element's atom..it usually takes place between metal and non metal atoms...like in NaCl, Na gives its valence electron to chlorine and completes its own octet. Chlorine accepts the electron and completes its own octet too...but now both the atoms have an opposing charge and hence they attract each other to form an IONIC bond.
Ionic bonds are the strongest of the bonds...here complete transfer of electrons takes place unlike covalent bonds.
HOPE IT HELPED..
:)
Answer:
The electrostatic interaction between an anion and cation
What is the difference between glucose and fructose.
Answer:
glucose is in large sugar molecules, while fructose is in simple fruits and vegetables
glucose breaks down disaccharides or polysaccharides with large sugar molecules and fructose is found in fruits and veggies like corn, mangos, and apples. they are both carbs.
how many electrons do noble gases have
Noble gases have 8 electrons in the outermost shells.
What are noble gases?They are the chemical elements that belong to group 8A of the periodic table.
They belong to group 8 because they have 8 electrons in their outermost shells. Their electron configuration is an octet. In other words, they do not need to donate or accept electrons to be stable.
Noble gases include helium, neon, argon, etc.
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Neither n2 nor o2 are greenhouse gases because
Neither N₂ or O₂ are greenhouses gases because they do not cause the greenhouse effect.
What are greenhouses gases?Greenhouse gases trap heat in the atmosphere causing the temperature of the planet to rise.
Greenhouse gases cause the greenhouse effect.
What is the greenhouse effect?
The greenhouse effect is the warming up of the planet due to greenhouse gases.
Greenhouse gases include
carbondioxidemethanenitrous oxide and water vapourSo, neither N₂ or O₂ are greenhouses gases because they do not cause the greenhouse effect.
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Please help me solve this questionn as fast as possible oofff
Answer:
sorry I don't know it I'm only 7 th grade
0.467 mol NaCl are needed to
create a 0.875 m solution using 534
g of water. How many grams of
sodium chloride are required to
make the solution?
The mass, in grams, of sodium chloride needed would be 27.29 grams.
Number of molesThe number of moles of a substance is mathematically given as:
Mole = mass/molar mass.
Thus, mass = mole x molar mass.
In this case, 0.467 moles of NaCl is needed. The mass of 0.467 moles of NaCl can then be calculated as:
Mass = 0.467 x 58.44 = 27.29 grams.
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