The number of molecules in 10 grams of oxygen is 1.88 x 10²³ Molecules.
The number of molecules in 10. 0 g of O₂ can be found by using the formula,
We know,
Mole = given mass/molar mass
Molar mass of oxygen gas is 32 g/mol.
Now, the number of moles in 10 grams oxygen is,
Moles = 10/32
Also,
Moles = Number of molecules/avogadro number.
Now, putting values,
10/32 = Number of molecule/avogadro number.
Number of molecules = 1.88 x 10²³ Molecules.
So, the number of molecules is 10. 0 g of O₂ is 1.88 x 10²³ Molecules.
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What does an atomic number represent in an atom? question 3 options: a. number of protons b. number of electrons c. number of neutrons d. number of protons and neutrons
The building block of all elements and the smallest component into which an element can be divided called?
The building block of all the elements and the smallest component into which an element can be divided is called as an atom.
An atom is the smallest part or the component into which the elements can be divided. Atom is the building block of the matter. The basic particles that an atom made up of are electrons, protons, and the neutrons.
The example is : An electron of a hydrogen atom will behave similar as the electron of an oxygen atom. Electron is the sub atomic particle of an atom and it cannot retain its chemical properties.
Thus , atom is the building block of all the elements.
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What percentage of energy do data centers use?.
According to the U.S. Department of Energy, data centers use roughly 2% of the world’s energy.
Data centers are responsible for a significant portion of the world’s energy consumption.
According to the U.S. Department of Energy, data centers use roughly 2% of the world’s energy, with that number estimated to grow as more businesses and organizations move their operations to digital and cloud-based systems.
That may not seem like a lot, but when you consider the amount of energy used to power, cool, and maintain data centers, the overall cost to the environment can be quite significant.
Data centers use energy for various purposes, from powering hardware such as servers and storage systems, to cooling the centers with air conditioning.
Data centers also require energy for their backup systems, such as generators and UPSs.
In addition, data centers need energy for their networking systems and for running other applications and services, such as data analytics and machine learning.
All of these factors contribute to the overall energy consumption of data centers.
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Which of the following is reduction reduction reaction? A. 2Mg(s)+O2→2Mg(s)B. S(s)+O2(g)→SO2(g)C. 2HgO(s)→2Hg(l)+O2(g)D. Mg(s)+S(s)→MgS(s)
The reduction reaction is given as :
2Mg + O₂ ---> 2MgO2HgO ----> 2Hg + O₂Mg + S ---> MgSThe reduction reaction is the reaction in which the addition of the hydrogen takes place and the addition of the electropositive element and the removal of the oxygen or any of the electronegative atom.
The reduction reaction is given below as :
2Mg + O₂ ---> 2MgO2HgO ----> 2Hg + O₂Mg + S ---> MgSThe gain of the electron is also called as the reduction reaction. The one which is reduce will acts as a oxidizing agent.
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5xy=9
15x3y=27 Determine if the following ytem of equation ha no olution, infinitely many olution, or exactly one olution
The equations will have only one solution.
The y-coefficients are opposites, so you can eliminate the y-variable by adding the equations:
(2x -y) + (3x +y) = (2) + (-6)
5x = -4
x = -4/5 = -0.8
Substituting this into the second equation, we have ...
3(-0.8) +y = -6
y = -3.6 . . . . . . . add 2.4 to both sides
The solution is (x, y) = (-0.8, -3.6).
What is an equation?
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one mole of magnesium has the same number of atoms as one mole of lithium. True/False ?
The positively charged center of the atom consisting of protons and neutrons is called
How would I balance this?
The balanced chemical equation is as follows:
4KClO₃ ₍s₎ ⇒ 3KClO₄ ₍s₎ + 3KCl
What is balance chemical equation ?The term balanced chemical equation is defined an equation where the number of atoms of each type in the reaction is the equal on both reactants and product sides.
The chemical equation must be balanced in order to obey the law of conservation of mass. When the number of different atoms of elements in the reactants side equals the number of atoms in the products side, the chemical equation is balanced.
Thus, The balanced chemical equation is as follows:
4KClO₃ ₍s₎ ⇒ 3KClO₄ ₍s₎ + 3KCl
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The pathway to release of neurohormones follows a series of steps. Arrange the phrases from left to right to create the correct pathway for the neurohormone ADH from synthesis to release.1) ADH synthesis in supraoptic neurons2) Transport in tract in infundibulum3) Storage in axon termini in posterior pituitary4) Action potentials arrive at the axon terminals
The regular practise of driving a car to school would be the daily action that would pollute the environment.
This phrase is used to describe all human activities that harm the environment we live in by making it unsafe for the living things that inhabit it. The smoke from exhaust, which is brought on by the burning of gasoline, would be the main source of pollution. It has an adverse impact on the ecosystem because it taints the air, making it hazardous for humans to breathe. It can cause respiratory illnesses in people and other types of poisoning, which has an effect on our health By choosing another mode of transportation or by walking to school, this issue could be lessened.
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Substances X,Y and Z can all act as oxidizing agents. In Colution X is Violet Y is Yello and Z is green. In the reactions they undergo thay are reduced to X- Y- and Z-, all of which are colorless. When a solution of Y is mixed with one containg X- ions the color changes from yellow to violet.
What Species Is oxidized? (X-)
Which Species is reduced(Y).
When a soulton of Y is mixed with one containing Z- ions, the solution remains yellow.
Is Y a better oxidizing agent than Z?
Is Y a better oxidizing agent than X?
Arrange X, Y, and Z in order of oxidizing strength from weakes to strongest.
1) X is reduced and Y is oxidized
2) Y is a better oxidizing agent than Z
3) X is a better oxidizing agents than Y
4) The order of the oxidizing abilities are;
X > Y > Z
What is an oxidizing agent?An oxidizing agent is a chemical substance that accepts electrons from other substances, thereby oxidizing them. In this process, the oxidizing agent becomes reduced itself. Oxidation and reduction occur simultaneously and are known as redox reactions.
An oxidizing agent has the ability to transfer electrons to another substance, resulting in an increase in oxidation state (the number of electrons an atom has lost or gained) of the oxidized substance and a decrease in oxidation state of the oxidizing agent.
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what is the limiting reagent when 16 grams of ch4 is reacted with 64 grams of o2? what remains after the reaction?
CH4 is limiting reagent and H20 remains after the reaction.
What is limiting reagent?A limiting reagent is a reactant that entirely consumes itself before any other reactants are used up in a chemical reaction, hence restricting the amount of product that may be created. It can be found by comparing the proportions of each component in the reaction and its stoichiometry. Once the limiting reagent has been determined, the amount of product that can be generated can be computed using the reaction's stoichiometry.
[tex]CH_4+2O_2- > CO_2+2H_2O[/tex]
number of moles of CH4= given mass/atomic mass
=> 16/16
so the number of moles of CH4 is 1
number of moles of O2 = 64/32
=2
so CH4 1 mole get vanished after the reaction and the gases like CO2 and O2 fly away so the limiting reagent is CH4
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What is the coefficient of the hypochlorite ion when the following equation is balanced?
ClO- + S2O3 2- —> Cl - + SO4 2-
(basic solution)
How many grams are in 23 moles of Fe
There are 23 atoms of Fe in a 55.845 gram. As a result, after dividing our mass of 239 grams by the iron formula mass of 55.84 grams per bole, formol equals after calculation.
How do I translate grams to moles?Use the millimeters to mole formula to calculate the molecular weight n, of a substance with a given mass, m, (in grams) accurately. n = m / M, where M is the substance's molar mass also known as gram-molecular weight. a substance's molecular weight expressed as a mass in grams. Example: NaCl salt weighs 58.44 grams per gram-mole. American Meteorological Society, copyright 2022.
What is moles and how is it made?Number of Avogadro = 6.023 × 10²³. The products of every chemical reaction are measured using the Avogadro number. 1 mole of atoms, molecules, or particles is equal to 6.023 x 1023. Calculating the number of molecules is as follows: mole number = quantity of material / mass of one mole.
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There are 23 atoms of Fe in a 55.845 gram. As a result, after dividing our mass of 239 grams by the iron formula mass of 55.84 grams per bole, formol equals after calculation.
How do I translate grams to moles?Use the millimeters to mole formula to calculate the molecular weight n, of a substance with a given mass, m, (in grams) accurately. n = m / M, where M is the substance's molar mass also known as gram-molecular weight. a substance's molecular weight expressed as a mass in grams. Example: NaCl salt weighs 58.44 grams per gram-mole. American Meteorological Society, copyright 2022.
What is moles and how is it made?Number of Avogadro = 6.023 × 10²³. The products of every chemical reaction are measured using the Avogadro number. 1 mole of atoms, molecules, or particles is equal to 6.023 x 1023. Calculating the number of molecules is as follows: mole number = quantity of material / mass of one mole.
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A football player runs in a straight line down the field, crossing the 20-yard line when the stopwatch reads 12 seconds and crossing the 70-yard line when the stopwatch reads 17 seconds. What is his speed in yards per second?
Answer: 10y/s
Explanation:
on the ph scale, which number has the highest concentration of hydrogen ions?
___used to express the mass of atomic and subatomic particles
An Atomic Mass Unit (AMU or amu) is a measure of mass and is used to express the mass of atomic and subatomic particles.
The Atomic Mass Unit (AMU or amu) of an element/particle constituent is a measure of its atomic mas. The AMUis also known as the dalton (Da) or a unified atomic mass unit (u). The measure of AMU expresses both atomic masses and molecular masses.
AMU is defined as one-twelfth (1/12th) of the mass of an atom of carbon-12 (12C). Carbon-12 (12C) is the most abundant naturally existing carbon isotope, accounting for over 98% of the carbon found in nature. It has an AMU of 12.
The atomic mass of an element/particle constituent measured in amu, is the same as the mass in grams of a single(one) mole of that element.
The atomic mass units of first 20 elements of periodic table are mentioned below:
Hydrogen - 1.007Helium - 4.002Lithium - 6.941Beryllium - 9.012Boron - 10.81Carbon - 12.011Nitrogen - 14.006Oxygen - 15.999Fluorine - 18.998Neon - 20.179Learn more about Atomic Mass Unit here:
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A sample of gas has a volume of 2.0 L at a temperature of 0°C. When the volume is
increased to 4.0 L at constant pressure, what is the new temperature?
This is an illustration of Boyle's law, which states that when mass and temperatures are held constant, a gas's volume changes inversely with pressure at 0.05 atm.
What is the fundamental idea behind Boyle's law?According to Boyle's law, pressure and volume of a gas are always inverse proportion at a specific temperature. It states that the pressure inside the lung will drop as the size of the lungs expands during inhalation.
Which scenario best illustrates Boyle's Law?When you inflate your bicycle tires, you can see how Boyle's Law is used in practice. The gasses inside a tire are squeezed and crammed closer together when air is pumped into it. This raises the gas's pressure, and It starts to press up against the tire walls.
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Are cricket ball of 0. 5 kg is moving with a velocity of hundred Metre per second the wavelength associated with its motion is?.
Its motion's corresponding wavelength is λ = [tex]1.32 \times 10 ^{-35}[/tex]
The wavelength, which will also apply to troughs, is the separation between two wave crests. The frequency is measured in cycles per second (Hz), which is the quantity of vibrations that cross a specific area in a second (Hertz). In this article, the relationship between wavelength and frequency is covered.
The ball (m) has a mass of 0.5 kg.
The ball is moving at a speed of 100 metres per second.
The de Broglie matter-wave equation reveals the following
[tex]\lambda = \frac{h}{mv}[/tex]
where m is mass of the body and v is the velocity and h is height of the body.
[tex]\lambda = \frac{ 6.62\times10^{-34}}{0.5 \times 100 }[/tex]
λ = [tex]1.32 \times 10 ^{-35}[/tex].
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Is C2H6 a non-polar molecule?.
A molecule which have atoms of significantly different electronegetivities exhibits polarity. In case of carbon and hydrogen there are no such significant differences. So ethane is non-polar.
Ethane is formed by covalent bond between carbon and hydrogen atoms. One carbon bonds with one another carbon atom and 3 hydrogen atoms. For exhibiting polarity, there must be significant differences in electronegativity.
While considering the C-H bond, electronegativity of carbon is 2.5 and hydrogen is 2.1. The difference is only 0.4, and such a difference does not contribute to polarity.
So, Ethane is a non-polar molecule.
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Soil erosion is a problem that is caused by many different factors. What can humans do to prevent soil erosion? To address this question, first think locally. What industries and businesses in your area may contribute to the erosion problem? What could be done to reduce these contributions? What happens in your state? What happens in your country? Once you have ideas about what can be done, who should be responsible for carrying out these actions? Should the government regulate these activities? Should individual companies take responsibility?
humans can prevent soil erosion by planting shrubs and grass, adding rocks to the ground and Constructing retaining walls.
What is soil erosion?Erosion is a surface process that involves the removal of soil, rock, or dissolved material from one area on the Earth's crust and the subsequent transport and depositing of the material at a different location. Weathering doesn't involve movement, unlike erosion, which does.
The two main drivers of erosion, wind and water, can easily carry bare soil away. While their leaves deflect rain and prevent it from tearing the earth apart, plant roots retain the soil together. this is why planting shrubs and cover crops is very important in preventing soil erosion.
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what effect does the coriolis effect have on global winds?
The Earth's rotation means that we experience an apparent force known as the Coriolis force. This deflects the direction of the wind to the right in the northern hemisphere and to the left in the southern hemisphere.
What is coriolis force?
The Coriolis effect describes the deflection pattern of objects that are not firmly attached to the ground as they travel long distances around the Earth. This effect is responsible for many large-scale weather patterns.The key to this effect lies in the Earth's rotation. Specifically, the Earth rotates faster at the equator than at the poles.To know more about ccoriolis force, click the link given below:
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What is temperature?
A. Electromagnetic waves
B. The measure of an object's "hotness"
OC. A type of heat transfer
D. The energy transferred between objects
Answer:
the measure of an object s hotness
Which qualities of the ocean help it to absorb heat?
The qualities of the ocean help it to absorb heat is its surface area.
The ocean temperature in each area is different, this is because each region has a different amount of light intensity. Apart from light, geographical location, wind gusts, and cloud conditions can affect the ocean surface temperature which can change. while the deep ocean tends to have a stable temperature.
Water has the property of absorbing heat more easily than air because of the hydrogen bonds between water molecules. When heat is absorbed it will cause the hydrogen bonds to break and water molecules can move freely so that the surface temperature of the water rises. The more surface area of ocean, the more heat absorbed by ocean. This causes the surface area of ocean to become one of the ocean qualities that helps absorb heat.
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3. Write the balanced nuclear equation showing the decay of protactinium-238 to uranium-238
The chemical element protoactinium, often known as protoactinium, has the atomic number 91 and the symbol Pa. The balanced nuclear equation for the decay of protactinium-238 to uranium-238 is;
²³⁴Pa₉₁ --> ⁰e₋₁ + ²³⁴U₉₁
It is an actinide metal that is thick, silvery-gray, and easily interacts with oxygen, water vapor, and inorganic acids. Protactinium normally exists in the oxidation state +5, however, it can also adopt +4, +3, or even +2 states when it forms different chemical combinations.
Protactinium concentrations in the Earth's crust typically range from a few parts per trillion to a few parts per million in certain uraninite ore occurrences. There are currently no uses for protactinium other than scientific research due to its rarity, high radioactivity, and severe toxicity. For this reason, protactinium is primarily collected from spent nuclear fuel.
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A 5.25 g sample of metal at 49.5 °C gives off 10.4 J of energy until it is at 40.5 °C. What is the specific heat of the metal?
The heat energy needed to change the 5.25 gram sample from a temperature of 49.5 to 40.5 °C is given 10.4 J. Then, the specific heat of the metal is 0.22 J/°C g.
What is calorimetry ?Calorimetry is an analytical technique used to determine the heat energy absorbed or released by a system. The calorimetric equation relating the heat energy q with the mass of the substance, m, specific heat, c and temperature difference, ΔT is given as:
q = m c ΔT.
Given that the mass of the sample of iron = 5.25 g
temperature difference ΔT = 49.5 - 40.5 = 9 °C
specific heat c = 0.450 J/ g °C.
The heat energy absorbed by the sample is calculated as follows:
10.4 J = 5.25 g × c J/ g °C × 9 °C.
Then,
c = 10.4 J / (5.25 g ×9 °C )
= 0.22 J/ g °C
Therefore, the specific heat of the metal is 0.22 J/ g °C.
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29. Identify which is a property of nonmetals *
good insulator
good conductor of electricity
have luster
Omalleable
(2 Points)
Answer:
Omalleable
Explanation:
Non-metals are very brittle, and cannot be rolled into wires or pounded into sheets. Conduction: They are poor conductors of heat and electricity. Luster: These have no metallic luster and do not reflect light.
Calculate the volume in mL of a 1.420 M NaOH solution required to titrate the following solutions:
(a) 25.00 mL of a 2.430 M HCI solution
(b) 25.00 mL of a 4.500 M H2SO4 solution
(c) 25.00 mL of a 1.500 M H3PO4 solution
The NaOH solution has a 159.75 mL capacity.1.500 M H3PO4 solution in 25.00 mL.
How much NaOH was used for the titration?
In a titration of the two chemicals, 26.60 mL of sulfuric acid is neutralized by 32.20 mL of sodium hydroxide that has a concentration of 0.250 mM.
In a titration of the two chemicals, 26.60 mL of sulfuric acid is neutralized by 32.20 mL of sodium hydroxide that has a concentration of 0.250 mM.
The percent volume/volume of a solution can be calculated using the following formula, which bases its results on the milliliter as the unit of volume (v):
As mL of solute per 100 mL of solution, % v/v is expressed.
X% = 5.0 mL HCl/100 mL of solution is a good illustration.
X/100 = 5.0/100. 100X = 500. \sX = 5.0%%
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According to the law of conservation of mass, which statement about chemical reactions is always true?(1 point)
Responses
The number of molecules in the reactants is the same as the number of molecules in the products.
The number of molecules in the reactants is the same as the number of molecules in the products.
The number of substances in the reactants is the same as the number substances in the products.
The number of substances in the reactants is the same as the number substances in the products.
The number of atoms of each element in the reactants is the same as the number of atoms of each element in the products.
The number of atoms of each element in the reactants is the same as the number of atoms of each element in the products.
The states of the substances in the reactants is the same as the states of the substances in the products.
According to the law of conservation of mass, Statement A. The number of atoms of each element in the reactants is the same as the number of atoms of each element in the products is true about chemical reactions.
What is the law of conservation of mass?The law of conservation of mass is a model indicating that matter cannot be created or destroyed, but it can be changed from one form to another.
Therefore, with this data, we can see that the law of conservation of mass indicates that the total mass of the system or number of atoms remains constant over time.
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Strontium-90 has a half-life of 29 years. If a site held 2000 kg of this isotope, approximately what mass of strontium-90 would be left after 116 years?.
After 116 years, 125 g of strontium-90 would still be present.
Describe half-life.
A substance's half-life is the amount of time needed for half of a radioactive substance's original quantity to degrade. It is a phrase that is used in nuclear chemistry to describe how quickly unstable atoms radioactively decay into other nuclear species by emitting particles or the amount of time needed for the rate of radioactive material disintegrations per second to drop to half of what it was initially.
The number of half-lives needed to compute the mass of strontium-90 after 116 years is calculated as follows: 116/20=4 half-lives.
The mass of Sr-90 during the first half life is 2000/2=1000 g.
Sr-90's mass is 1000/2, or 500 g, during its second half life.
Sr-90 mass at its third half-life is 500/2, or 250 g.
Sr-90 mass equals 250/2=125 g at the fourth half-life.
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After a recrystallization, a pure substance will ideally appear as a network of?
When observed under a microscope, an impure substance is a non-homogeneous mixture in which some components have various colours or textures.
A process called recrystallization is used to clean an impure chemical in a solvent. The idea put forward here is that as temperature rises, most solids become more soluble. The process of fractional crystallisation is also known as recrystallization. A pure substance should ideally show up as a network of big crystals after recrystallization. If not, it might be beneficial to reheat the flask and let the contents cool more gradually. The appearance of the pure substances is homogenous A homogeneous combination (a pure substance) manifests as regularity. For example, a pure substance will have the same colour or texture on all sides, regardless of its size, when viewed. Steel and pure water are two examples of pure things.
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