why does the atomic radius decrease going from left to right across a period?

The heat absorbed by the water is 351.96 joules.

The heat required to raise the temperature of the unit mass of a given substance by a given amount (usually one degree) is called specific heat capacity.

Given is to find the heat absorbed by the water, in joules.

We can write the heat absorbed as -

Q = mCΔT

Q = 10 x 4.186 x 8.4

Q = 41.9 x 8.4

Q = 351.96 joules

Therefore, the heat absorbed by the water is 351.96 joules.

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Molality is term used for the amount of solute in moles per kilogram of solvent.

Generally, molality (m) is defined as the number of moles of solute per kilogram of solvent.

The formula for molality is given as:

Molality (m) = moles of solute / kilograms of solvent.

Students must remember that molality is used to measure the moles in relation to the mass of the solvent and not the mass of the solution.

Molality can also be defined as the “total moles of a solute contained in a kilogram of a solvent.” The other name of molality is also known as molal concentration which is a measure of solute concentration in a solution.

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An alloy of a transition metal is manganese (III) oxide. The chemical formula of this molecule is Mn2O3, and the oxidation state of the manganese in it is +3.  

Because manganese is a transition metal, as it chemically reacts with oxygen, the electrons will be taken up as it loses valence electrons to achieve stability. It will consequently result in the creation of an ionic compound. Mn in this molecule has an oxidation state of +3 and oxygen has an oxidation state of -2. As a result, manganese (III) oxide can be classified as a transition metal complex. The chemical formula of the compound is, and the oxidation state of the manganese in it is +3.

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Complete question:

Manganese (III) oxide is a transition metal compound. The oxidation state of manganese in this compound is _______ , and the chemical formula of the compound is __ __ __ __.

The molarity of the solution is 1.6687 M. This show that every liter of solutions containing 1.6687 mol of sodium sulfate.

Given data:

Formula:

[tex]\bf M = \dfrac{n}{V}[/tex]

Therefore:

First, calculate the molecular mass (Mr) of Na₂SO₄.

Second, calculate the mole of Na₂SO₄.

[tex]\begin{array}{ll}\sf n &\sf = \dfrac{g}{Mr}\\\\&\sf = \dfrac{545}{142}\\\\&\sf = 3.84~mol.\end{array}[/tex]

Last step, calculate the molarity.

[tex]\begin{array}{ll}\sf M~Na_2SO_4 &\sf = \dfrac{n}{V}\\\\&\sf = \dfrac{3.84}{2.30}\\\\&\sf = 1.6687~M.\end{array}[/tex]

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Answer: B

Explanation: Took the test

The crystallization step of recrystallization removes the impurities present within the crystal lattice.

The washing step of recrystallization removes the impurities present on the surface of solid.

The solute crystallizes out when the solvent cools and the solution gets saturated with the solute (reforms a solid). Impurities are eliminated from the crystal lattice as the crystal grows, concluding the purification procedure. After that, the crystals can be gathered, cleaned, and dried.

Because the impurities won't crystallize quite yet and instead remain in the solution, the impure substance will crystallize in a purer form. The more pure crystals must now be separated using a filtration procedure. It is possible to repeat the process.

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The mass of the steel cylinder is 1.939 kilograms. The mass of an object can be calculated by multiplying its volume by its density.

The volume of the steel cylinder is 246 cm3 and its density is 7.93 g/cm3, so its mass can be calculated as follows:

Since 1 kilogram is equal to 1000 grams, we can divide the mass in grams by 1000 to get the mass in kilograms:

So, the mass of the steel cylinder is 1.939 kilograms.

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The formula for Nitrate ion is [tex]NO^{3-}[/tex]. This is a polyatomic ion containing nitrate ion. It is called Nitrate oxo-anion.

[tex]NO3^{-}[/tex] is a nitrogen oxo-anion, a member of reactive nitrogen species and a monovalent inorganic anion. This ion is a polyatomic anion with the empirical formula NO3- and a molecular mass of 62.01 Daltons. The ion consists of one central nitrogen atom surrounded by three identical oxygen atoms in a trigonal planar arrangement. It carries a negative one formal charge. It carries negative charge because the single bound oxygen atoms have nine electrons linked with them moreover they have a negative charge overall. That means the nitrate ion has an overall charge of -1. The bond order of nitrate ion can be calculated using its Lewis dot structure. Bond order is the total number of bonds number of bonds group. In NO3- ion there are four N - O bonds and three bond groups.

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The object's displacement for the given time period exists 8i - 6j.

A circuit's opposition to current flow is measured by its resistance. The Greek letter omega  (Ω) stands for ohms, which are used to measure resistance.

The given parameter be

[tex]$$\begin{aligned}& r=t^2 i-(3 t+3) j \\& \mathrm{t}_1=1 \mathrm{~s} \\& \mathrm{t}_2=3 \mathrm{~s}\end{aligned}$$[/tex]

When the time is 1 s, the object's position is determined as follows:

[tex]$$\begin{aligned}& r_1=(1)^2 i-(3 \times 1+3) j \\& r_1=i-(6) j \\& r_1=i-6 j\end{aligned}$$[/tex]

When the time is 3 s, the object's position is determined as follows:

[tex]$$\begin{aligned}& r_2=(3)^2 i-(3 \times 3+3) j \\& r_2=9 i-(9+3) j \\& r_2=9 i-12 j\end{aligned}$$[/tex]

The displacement of the object exists estimated as;

Δr = [tex]$$r_2-r_1[/tex]

substitute the values in the above equation, we get

Δr = 4i - 9j - (i - 6j)

simplifying the equation, we get

Δr = 9i - 12j - i + 6j

Δr = (9i - i) + (-12j + 6j)

Δr = 8i - 6j

Therefore, the object's displacement for the given time period is 8i - 6j.

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The gas that would deviate the least from ideal gas behavior is Ne (Neon).

Neon is a noble gas and has no permanent dipole-dipole interactions, making it behave most like an ideal gas.Neon is a diatomic molecule, meaning it is composed of two atoms, and its molecules are not very polar or reactive.Neon is a noble gas element with the atomic number 10 and symbol Ne. It is odorless, colorless, and gas at room temperature and pressure. It is used in a variety of applications, including electric signs, fluorescent lamps, high-voltage indicators, lightning arresters, welding, and lasers. It is also used in cryogenics and in some medical treatments.

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Answer:

Opposite charges attract both within the same atom and between atoms.

Explanation:

Hope this helps :)

Answer:

.

Explanation:

Diffusion is the net movement of anything from a region of higher concentration to a region of lower concentration.

Osmosis is the movement of water molecules from a solution with a high concentration of water molecules to a solution with a lower concentration of water molecules,

Similarly : Both diffusion and osmosis occur to stabilize the concentration of molecules.

Difference : Osmosis can only function in a liquid medium, but diffusion can occur in all three mediums (solid, liquid and gas).

Hope it helps..

The amount of effort required to pump the oil from the spout is [tex]4*10^{6} J.[/tex]

Using Pythagoras theorem gives:-

[tex]r^{2} +y^{2} =3^{2}[/tex]

⇒ [tex]\\r^{2} = 9-y^{2}[/tex]

⇒ [tex]\\r= \sqrt{9-y^{2} }[/tex]

The volume (v) is :- [tex]v= \pi r^{2}[/tex]Δy

v= [tex]\pi (9-y^{2} )[/tex]Δy.

mass(m)= density ×volume,

m= [tex]\pi (9-y^{2} )[/tex]Δy×900

Force = mass × acceleration due to gravity(g),

force=  [tex]900\pi *(9-y^{2} )[/tex]Δy × 9.8,

As a result, a distance of 4-y is moved.

work= force ×distance,

work(W)= [tex]8820\pi (9-y^{2} )[/tex]Δy × (4-y),

W= [tex]\int\limits^3_-3 {8820\pi(9-y^{2})(4-y)} \, dyW= 4*10^{6} joules.[/tex]

The work required to pump the oil out of the spout is [tex]4*10^{6} .[/tex]

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Orange = Blue, Green = Red, Blue = Orange, and Red = Green in a solution that takes on the appearance of the hue provided. Orange Green Blue Red

The wavelengths that are reflected or transmitted create the colors we perceive. For instance, a red garment appears red because the fabric's dye molecules have absorbed light waves from the violet/blue end of the spectrum.

Since light is energy, the more light the thing takes in, the more heat is taken in. Black is the color that absorbs the greatest heat, if color is a thing. All light's wavelengths are absorbed and none are reflected by a dark object. White objects, on the other hand, reflect all light wavelengths and hence absorb the least heat.

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The magnitude of the electric field is 2.4 X 10^21 N/C.

Large atoms' nuclei, like that of uranium, which has 92 protons, can be represented as spherically symmetric spheres of charge. Around 7.4 10 15 meters, or 7.4 10 15 meters, is the uranium nucleus' radius.

The physical field that surrounds electrically charged particles and exerts a force on all other charged particles in the field, either attracting or repelling them, is known as an electric field (or E-field). It can also refer to a system of charged particles' physical field.

The magnitude of the electric field is 2.4 X 10^21 N/C.

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During one cycle, the sodium potassium pump binds and moves 3 Na⁺ out of and 2K⁺ into the cell. Option B is correct.

The sodium-potassium pump is an essential membrane protein that helps to maintain the electrochemical gradient across the cell membrane of all animal cells. In each cycle of the pump, three sodium ions (Na+) are pumped out of the cell, while two potassium ions (K+) are pumped into the cell.

This movement of the ions will requires energy in the form of ATP hydrolysis. The resulting electrochemical gradient is important for various cellular processes, including nerve impulse transmission, muscle contraction, and osmoregulation.

Hence, B. 3 Na⁺ out of and 2K⁺ into the cell is the correct option.

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--The given question is incomplete, the complete question is

"During one cycle, the sodium potassium pump binds and moves; a) 2 Na⁺ into and 2 K⁺ out of the cell b)3 Na⁺ out of and 2K⁺ into the cell c)2 Na⁺ out of and 3 K⁺ into the cell d) 1 Na⁺ into and 2 K⁺ out of the cell e) 3 Na⁺ into and 3 K⁺ out of the cell"--

The color absorbed by a solution that appears the color given Green is Red.

The many colors we can see are caused by the various wavelengths that are present in the visible spectrum. We can recall the colors red, orange, yellow, green, blue, indigo, and violet by using the abbreviation "ROYGBIV." The figure below shows these in reverse order. Red is the least vibrant color, whereas violet is the strongest.

According to the graph, 550 nm light would appear green to us if it were shone upon us. White is made up of all the light wavelengths, hence it is not included in our visible spectrum. A nice illustration is a light bulb. Because it emits at least some of all the visible wavelengths, it appears white.

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The molality of the solution is 0.162 m. Molality is a measure of the concentration of a solute in a solution and is defined as the number of moles of solute per kilogram of solvent.

To calculate the molality, we first need to find the number of moles of solute in the solution and then divide that by the mass of the solvent. The number of moles of solute in the solution is 0.18 moles.

The volume of the solution is 100.0 mL, or 0.100 L, and its density is 1.08 g/mL, so the mass of the solvent can be calculated as:

So, the molality of the solution is 0.18 moles / 0.108 kg = 0.162 m (moles per kilogram). The unit of molality is moles per kilogram of solvent and is often used when the amount of solvent is large relative to the amount of solute.

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Scientist study determines air bubbles trapped in ice and tree rings air temperature at the time it was formed.

Option B and C are correct.

Climate climatology is the study of how climate changes over time. The atmospheric factors that influence weather patterns and temperature variations over time are better understood thanks to this research.

They make it possible to connect rocks from different places, which is important when making geological maps, looking for oil or gas, and building big civil engineering projects. The fossils' ages revealed when the ocean was extremely cold. By finding cold-water foraminifera of the same age in other seas, scientists can create maps that show where cold water was at various points in Earth's history.

Incomplete question :

Which do scientists study to determine air temperature at the time it was formed? Select the two correct answers.

A.Fossilized pollen

B.air bubbles trapped in ice

C.tree rings

D.chemical isotopes in foraminifera shells

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3452 J/mol is the average kinetic energy of 1 mole of so at 300 K. So, option C. 3452 J/mol is correct choice.

One mole of gas has an average kinetic energy of, which can be calculated using the formula below:

[tex]KE_{avg} = (3/2) \times R \times T[/tex]

where

[tex]KE_{avg}[/tex] is the average kinetic energy,

R is the gas constant,

T is the temperature in Kelvin.

We must convert from mass-based units to mole-based units for SO gas (sulfur monoxide) using the molar mass of SO. SO has a molar mass of around 64 g/mol.

Therefore, 1 mole of SO gas has a mass of nearly 64 grams.

When we enter the values into the formula, we obtain:

[tex]KE_{avg} = (3/2) \times R \times T[/tex]

[tex]= (3/2) \times 8.314 J/(mol \:K) \times 300 K[/tex]

= 3742 J/mol

Hence, 1 mole of SO gas has an average kinetic energy of around 3742 J/mol at 300 K.

The closest solution from the offered possibilities is 3452 J/mol.

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The increase in the percentage of oxygen in the early atmosphere was a result of the evolution of photosynthetic organisms, and it played a crucial role in the development of life on Earth.

What is Atmosphere?

The atmosphere is the layer of gases that surrounds a planet and is held in place by the planet's gravity. On Earth, the atmosphere is composed of a mixture of gases that include nitrogen (78%), oxygen (21%), argon (0.9%), and carbon dioxide (0.04%), as well as trace amounts of other gases. The atmosphere plays a vital role in supporting life on Earth, providing the air that we breathe and protecting us from harmful radiation from the sun.

The early atmosphere of the Earth was mostly composed of nitrogen, carbon dioxide, water vapor, and small amounts of methane, ammonia, and other gases. The percentage of oxygen in the early atmosphere was very low, estimated to be less than 0.1%.

The increase in the percentage of oxygen in the Earth's atmosphere is believed to be due to the emergence and evolution of photosynthetic organisms, such as cyanobacteria and algae. These organisms are capable of using sunlight to convert carbon dioxide and water into organic matter and oxygen through the process of photosynthesis. This process began around 3.5 billion years ago and over time, oxygen began to accumulate in the atmosphere, as it was released as a waste product of photosynthesis.

As oxygen levels increased, it became possible for more complex organisms to evolve, including those that use oxygen for respiration. The accumulation of oxygen also had a significant impact on the Earth's climate and environment, leading to the development of the ozone layer and the reduction of carbon dioxide levels in the atmosphere.

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The Lewis symbol consists of two dots representing electrons surrounding the chemical symbol for oxygen (O). This represents the distribution of electrons in the O2- ion, where oxygen has gained two electrons to form a negative ion.

The Lewis symbol for O2- would be:

O

. .

Lewis symbol is a simple representation of the electron configuration of an atom. It is named after the chemist Gilbert N. Lewis who first introduced this notation in 1916.

Lewis symbol consists of the chemical symbol for the element surrounded by dots representing the valence electrons of the atom. The number of dots is equal to the number of valence electrons in the neutral atom.

These dots are arranged in pairs to represent the electrons in the chemical bonds between atoms. By convention, the dots are placed on the side of the symbol that corresponds to the side of the bond that the electron is approaching.

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Since it is created in the first step and used up in the second, Clo (g) is the reaction intermediate. O 3 (g)+O (g)2O 2 is the overall reaction (g)

What is reaction intermediate?

A reaction intermediate, also known as an intermediate, is a molecular entity that is created from the reactants (or previous intermediates) in chemical reactions that take place in steps and have several elementary steps. Although they represent the end result of one elementary step's reaction, intermediates do not appear in the chemical equation for the whole chemical equation. According to the IUPAC Gold Book, an intermediate is a substance that is generated (directly or indirectly) from the reactants and undergoes additional reactions to give rise to (either directly or indirectly) the products of a chemical process. Its lifetime exceeds that of a molecular vibration.

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Answer: 95.8 I hope this helps U :)

Explanation: Therefore 0.552 moles will have 0.552 moles X 6.022 X10 23 atoms/mole... are present in 1.52 mol of sulfur dioxide a) 2.29 x 10^23 b) 1.83 x 10^24 c) ... Mass of 1 H atom: 1.008 amu x 1.661 x10-24 g/amu = 1.674 x10-24 g. Mass of 1 mole of H ... many iron atoms are present in a piece of iron weighing 95.8 g?

The bond line structure, also known as the skeletal formula or stick diagram, is a type of molecular structure representation used in Chemistry.

It is a simplified way to show the bonding between atoms in a molecule without explicitly drawing each atom or bond. Instead, the bond line structure uses lines to represent the bonds between atoms, with the atoms themselves implied at the end or intersection of the lines.

For example, in the bond line structure of ethane (C₂H₆), the two carbon atoms are represented by the ends of a line and the six hydrogen atoms are implied at the ends and intersections of the lines.

This makes the bond line structure a more compact and efficient way to represent molecules compared to other methods, such as the Lewis structure.

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The answer is 20.00 moles

Mole is a very important unit of measurement that chemists use.

To calculate the number of moles in 1.204 x 10^24 atoms of zinc, we need to use Avogadro's number, which is 6.022 x 10^23 atoms/mole.

First, we can calculate the number of moles by dividing the number of atoms by Avogadro's number:

1.204 x 10^24 atoms / 6.022 x 10^23 atoms/mole = 20 moles

Therefore, there are 20 moles in 1.204 x 10^24 atoms of zinc.

Since the given value has four significant figures, we should report our answer with four significant figures as well. Therefore, the answer is:

20.00 moles

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The basic sugar glucose has the chemical formula C6H12O6. In terms of an empirical formula, CH2O represents glucose.

The empirical formula for a compound represents the simplest whole-number ratio of atoms in the compound.

As per the details provided in the above given question,

To determine the empirical formula of glucose, we need to divide the subscripts in the molecular formula by the greatest common factor (GCF) of those subscripts.

The subscripts of C6H12O6 can be divided by 6 to get the simplest whole-number ratio:

C6H12O6 ÷ 6

Further we get,

= CH2O

Therefore, the empirical formula for glucose is CH2O.

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The charge of aluminum ion is +3. This is determined by the number of electrons that are lost or gained by an atom to form an ion.

In the case of aluminum, it has an atomic number of 13, which means it has 13 protons and 13 electrons in its neutral state. To form an ion, aluminum will lose 3 electrons, leaving it with 10 electrons and 13 protons.

Since protons have a positive charge and electrons have a negative charge, the difference between the two will give us the overall charge of the ion. In this case, 13 protons - 10 electrons = +3, so the charge of the aluminum ion is +3.

The charge of aluminum ion is +3 and it is determined by the difference between the number of protons and electrons in the ion.

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Answer:
Cloud computing (English: cloud computing) is the general name of internet-based computing services for computers and other devices that provide computing resources that can be used at any time and shared among users. In this respect, cloud computing is not a product, but a service; By providing the sharing of software and information in the basic source, the existing information service; computers and other devices, similar to electrical distributors, over a computer network (typically the Internet).

Explanation: