How many carbon atoms are in 0.58 g of a sample of diamond? Diamonds are composed entirely of carbon.

When 7.524 is rounded to 3 significant figures, it will be 7.52.

The process of changing a number to a nearby number with fewer significant digits is known as rounding.

Rounding can be done to the nearest integer, the nearest tenth, the nearest hundredth, and so on.

Here are some pointers on rounding numbers to a certain number of significant digits:If the digit following the last significant digit is less than 5, simply drop it and all following digits.

(round down)For example, 2.832 rounded to two significant digits is 2.8 since the 3 is followed by a 2 which is less than 5.

If the digit following the last significant digit is greater than 5, add 1 to the last significant digit, then drop all of the digits that follow it.

(round up)For example, 4.673 rounded to two significant digits is 4.7 since the 3 is followed by a 7 which is greater than 5.

If the digit following the last significant digit is exactly 5, the preceding digit is odd, and no other digits follow, increase the last significant digit by 1.

If the digit following the last significant digit is exactly 5, the preceding digit is even, and no other digits follow, simply leave the last significant digit alone.

For example, 2.875 rounded to two significant digits is 2.9 since the 5 is followed by an odd number, which means that the 8 should be rounded up, while 2.765 rounded to two significant digits is 2.8 since the 5 is followed by an even number, which means that the 6 should be left alone.

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Answer:

1) temperature,

2) plant, physical, cracks, grow

3) freeze-thaw, physical

4) rain, chemical, acid rain, fossil

Explanation:

I'm not too sure if all of these are correct, but I hope this helps

For an electron as a particle, E = \(1/2mv^2\)

For an electron as a particle, the energy E can be described using the equation:

E =  \(1/2mv^2\)

where

This equation represents the kinetic energy of the electron, which is the E is the energy

energy associated with its motion.

This equation assumes classical mechanics and does not take into account relativistic effects that become significant at high speeds close to the speed of light.

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Derivate planar density expressions for FCC(100) and (111) is 1/4R² and 4R²√3, number of  atoms are centered on the [100] in FCC is 4.

Atoms can be arranged either closely or widely together. A periodic three-dimensional pattern of atoms is packed into crystalline solids like metals. Atoms are not subject to periodic packing in non-crystalline materials like silicon oxide. A unit cell is a crystal structure's fundamental building block. The packing density of crystals is measured by planar density.

For (100) plane one atom at each of  four cube corners

,each of which is shared with four adjecent unit cells.

Centre atom lies with in the unit cell.

Thus there is the equivalence of 2 atoms associated with this FCC(100) plane.

The plannar section in the above figure is square.

Where

The side lengths are equal to unit cell edge length = 2R√2

Area of the square =( 2R√2 )2

                            =8R2

a) So plannar density of (100) plane

PD (100)plane =(number of atoms centerd at (100) plane)  / (area of plane)

                    = (2) / 8R2

                    =1 / 4R2

∴Plannar density of  FCC(100) is 1 / 4R2.

b) There are 6 atoms whose centre lie on this plane .

Total  equivalence is 2 atoms associated with this FCC(111) plane at centered.

In above diagram

 (2R)2 + h2 = 4R2

which leads to h = 2R√3

Thus Area =4(R) (h) /2

                 =4(R) (2R√3) /2

                 =4R2√3

PD (111)plane =(number of atoms centerd at (111) plane)  / (area of plane)

                    =(2) / 4R2√3

                     =1/ (2R2√3)

∴Plannar density of  FCC(111) is 1/ (2R2√3).

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The amount of heat energy absorbed when 200 grams of water are heated from 20 C to 60 C is 33,440 Joules.

To find the amount of heat energy absorbed when 200 grams of water are heated from 20 C to 60 C, we can use the equation Q = mcAT.
First, we need to find the value of m, which is the mass of the water in grams. In this case, it is given as 200 grams.
Next, we need to find the value of AT, which is the change in temperature in degrees Celsius.

This can be calculated by subtracting the initial temperature from the final temperature, which gives us 60 C - 20 C = 40 C.
The specific heat capacity of water, C, is given as 4.18 Joules per gram per degree Celsius.
Now we can plug in the values into the equation:
Q = mcAT
Q = (200 g) x (4.18 J/g°C) x (40°C)
Q = 33,440 J
Therefore, the amount of heat energy absorbed when 200 grams of water are heated from 20 C to 60 C is 33,440 Joules.

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A carbocation rearrangement with a methyl shift is the outcome of the process.

Methyl shift is the transfer of a methyl group from one charged carbon atom in a molecule to a nearby, uncharged carbon atom. If the changing chemical species is a methyl group, we refer to this as a methyl shift, albeit it might also be any other potential alkyl group.

These are the steps of reaction of 2,2-dimethyl-1-propanol with HBr

1) 2,2-dimethyl-1-propanol is protonated in the first step.

2) The removal of \(H_{2} O\) results in the formation of a carbo cationic intermediate in the second step.
3) the methyl group is shifted to produce a more stable carbo cationic intermediate.
4) Br-Br-attacks the stable carbocation to produce 2-bromo-2-methylbutane.

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21 moles of oxygen are produced from 14 moles of potassium chlorate according to the balanced chemical equation.

Using the equation from problem 2, we can determine the moles of oxygen produced from 14 moles of potassium chlorate. Assuming the decomposition of potassium chlorate (\(KClo_{3}\)) to potassium chloride (KCl) and oxygen (O2) is the equation in question:

2 \(KClo_{3}\) → 2 KCl + 3 \(O_{2}\)

To find the moles of oxygen produced, we use stoichiometry. Analyze the balanced equation and identify the mole ratio between potassium chlorate and oxygen:

2 moles of \(KClo_{3}\) → 3 moles of \(O_{2}\)

Now, apply this ratio to the given amount of potassium chlorate, which is 14 moles:

(14 moles \(KClo_{3}\)) x (3 moles \(O_{2}\) / 2 moles \(KClo_{3}\))

The moles of \(KClo_{3}\) cancel out:

(14) x (3/2) = 21 moles of \(O_{2}\)

So,21 moles of oxygen are produced from 14 moles of potassium chlorate according to the balanced chemical equation.

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Answer:

N

Explanation:

N can get the clip from 8cm away....the others are less ...so N appears to be the strongest magnet

Group 17 is located on the right side of the periodic table. The atomic radius increases from right to left. It means that group 17 elements have a small atomic radius. Also, they have only one electron in the valence shell, their ionization energy is low, and it is easy to lose that electron. This fact explains its high reactivity.

Answer: Nonmetals have a small atomic radius and can lose electrons easily.

The mass of the oxygen gas that is consumed in the process is 5491.2 g.

Stoichiometry is important in chemical reactions because it allows us to predict the amount of products that can be produced from a given amount of reactants, and to determine how much of each reactant is needed to produce a desired amount of product.

The equation of rust is;

4Fe + 3O2 → 2Fe2O3

Number of mols of iron III oxide

= 18.3 * 10^3g/160 g/mol

= 114.4 moles

Now;

3 moles of O2 produces 2 moles of iron III oxide

x moles of O2 produces 114.4 moles of Fe2O3

=171.6  moles

Mass of oxygen = 171.6 moles * 32 g/mol

= 5491.2 g

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The pOH of a solution can be calculated using the formula: pOH = -log[OH-]. To find the [OH-] concentration when the pOH is 7, we need to convert the pOH value to the OH- concentration.

Starting with pOH = 7, we can rearrange the equation to find [OH-]. Taking the antilog of both sides, we get 10^(-pOH) = 10^(-7). This simplifies to [OH-] = 10^(-7) or 0.0000001 M.

Therefore, the [OH-] concentration in the solution with a pOH of 7 is 0.0000001 M or 1 x 10^(-7) M.

It's worth noting that the pOH and pH of a solution are related by the equation: pH + pOH = 14. In this case, if the pOH is 7, the pH of the solution would be 14 - 7 = 7.

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Answer:

To determine the enthalpy and entropy of dissolving a compound, you need to measure the Ksp at multiple temperatures. Then, plot ln(Ksp) vs. 1/T. The slope of the plotted line relates to the enthalpy (ΔH) of dissolving and the intercept of the plotted line relates to the entropy (ΔS) of dissolving.

Explanation:

Hello there!

In this case, according to the given information, it turns out possible for us use the thermodynamic definition of the Gibbs free energy and its relationship with Ksp as follows:

\(\Delta G=-RTln(Ksp)\\\\\Delta G=\Delta H-T\Delta S\)

Thus, by combining them, we obtain:

\(-RTln(Ksp)=\Delta H-T\Delta S\\\\ln(Ksp)=-\frac{\Delta H}{RT} +\frac{T\Delta S}{RT} \\\\ln(Ksp)=-\frac{\Delta H}{RT} +\frac{\Delta S}{R}\)

Which is related to the general line equation:

\(y=mx+b\)

Whereas:

\(y=ln(Ksp)\\\\m=-\frac{\Delta H}{R} \\\\x=\frac{1}{T} \\\\b=\frac{\Delta S}{R}\)

It means that we answer to the blanks as follows:

To determine the enthalpy and entropy of dissolving a compound, you need to measure the Ksp at multiple temperatures. Then, plot ln(Ksp) vs. 1/T. The slope of the plotted line relates to the enthalpy (ΔH) of dissolving and the intercept of the plotted line relates to the entropy (ΔS) of dissolving.

Regards!

Answer:

38.3 g

Explanation:

8) What mass of chlorine reacts with 20.0 g of iron to form iron(III) chloride?​

first write, then balance the equation

Fe + Cl2-------------> FeCl3

2Fe + 3Cl2----------> 2FeCl3

2 moles of Fe require 3 moles of Cl2

the atomic mass of Fe is 56

20/56= 0.36 moles of Fe

this requires o.36 X 3/2 = 0.54 moles of Cl2

Cl2 has a molar mass of 35.5 X 2=71

1 mole of Cl2 is 71g

0.54 moles is 0.54 X 71 g= 38.3 g

The mass of chlorine reacts with 20.0 g of iron to form iron(III) chloride is 38.3 g.

Mass is defined as a numerical representation of the fundamental characteristic of all matter, inertia.

It can also be defined as a dimensionless number used to describe the mass of a particle or item.

\(\rm 2Fe + 3Cl_2\rightarrow2FeCl_3\)

As per the reaction 3 mole of chlorine is required for 2 mole of fluorine.

Atomic mass of fluorine = 56

Moles of Fe = 20 / 56

                    =  0.36 moles

This require 0.36 x 3/2 = 0.54 moles of Cl₂

Molar mass of Cl = 35.5

So for Cl₂ = 2 x 35.5 = 71 moles

For 1 mole of Cl₂ = 71 moles is needed

So, for 0.54 moles = 71 x 0.54

                               = 38.3 g

Thus, the mass of chlorine reacts with 20.0 g of iron to form iron(III) chloride is 38.3 g.

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This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97. The incorrect representation for a neutral atom is 36Li

To determine the correct representation for a neutral atom, we need to consider the atomic number (Z) and mass number (A) of the element. The atomic number represents the number of protons in the nucleus, while the mass number represents the sum of protons and neutrons.

Let's analyze the given representations:

36Li:

This representation suggests that the element is lithium (Li) with a mass number of 36, which is incorrect. The correct mass number for lithium is approximately 6.94.

613C:

This representation suggests that the element is carbon (C) with a mass number of 13, which is correct. Carbon has different isotopes, and 13C represents one of its stable isotopes.

3063Cu:

This representation suggests that the element is copper (Cu) with a mass number of 63, which is correct. Copper has different isotopes, and 63Cu represents one of its stable isotopes.

1530P:

This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97.

Therefore, the incorrect representation for a neutral atom is 36Li, as it does not match the known properties of lithium.

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Name of [Cu[NH3)2] please fast

1. First name the ligand (ammine-NH3) using prefix (tetra-4) to designate number of ligands.

2. Name the central atom (copper-Cu) followed by its oxidation state (ii) in roman letter using suffix ion(since it is not neutral entity).

Explanation:

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Answer:

More energy is released from the old substance than the new substance needs to form its chemical bonds

Explanation:

Chemical A and Chemical B react in an exothermic reaction. When Chemical A and Chemical B are mixed together more energy will be released from the old substance than the new substance will need to form its chemical bonds. Therefore, option B is correct.

When a chemical reaction goes on, energy is shifted to or from the surroundings. When energy is moved to the surroundings, this is called an exothermic reaction, and the temperature of the surroundings increases.

Examples of exothermic reactions are combustion reactions and many oxidation reactions.

A chemical reaction is exothermic if heat is passed by the system into the surroundings. Because the surroundings are deriving heat from the system, the temperature of the surroundings increases.

Thus, option B is correct.

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Answer:

Measure the volume of water poured into a graduated cylinder, then place the object in the water and remeasure the volume. The difference between the two volume measurements is the volume of the object. Now simply divide the mass by the volume to calculate the density of the object.

Answer:

Idon't know if this helps but I think it is a linear structure and if I am wrong I am so sorry

Answer:

When methyl violet is added to water the solution is violet in colour. When HCl is added, it turns dark yellow. Addition of NaOH turns the colour to violet again.

Explanation:

The sequence of colour changes outlined in the answer stems from Le Chaterliers principle.

The equilibrium set up in a solution of yellow violet is;

HMV (aq) ---------> H^+(aq) + MV^- (aq)

HMV is yellow in colour while MV^- is violet in colour. Addition of HMV to water leads to its dissolution and release of MV^- ion, hence the solution turns violet. Similarly, when HCl is added, H^+ concentration increases and HMV is formed again, hence the solution turns yellow. If NaOH is added, the solution becomes alkaline, the equilibrium shifts in favour of more MV^- and the solution turns violet again.

Table salt does not melt on the stove, it dissolves in water and does not conduct electricity.

There are several substances listed in the table Epsom salt is another one of these substances. It does not melt on a stove, it dissolves in water and also conducts electricity.

Finally, potassium chloride does not melt on the stove, it dissolves in water and it does conduct electricity. These are the experiences one can have with these common substances.

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The [OH⁻] concentration is  1.9 × 10⁻² M and the  [H⁺] concentration is 3.9 × 10⁻⁸ M

a) [ H⁺ ] = 4.9 × 10⁻¹³ M

pH = - log [ 4.9 × 10⁻¹³ ]

pH = 12.3

pH + pOH = 14

pOH = 14 - 12.3 = 1.7

pOH = -log [OH⁻]

[OH⁻] = 10^-1.7

         = 1.9 × 10⁻² M

b) pOH = - log [ 2.2 × 10⁻⁷]

pOH = 6.6

pOH + pH = 14

pH = 7.4

pH = -log [H⁺]

[H⁺] = 10^-7.4

[H⁺] = 3.9 × 10⁻⁸ M

Thus, The [OH⁻] concentration is  1.9 × 10⁻² M and the  [H⁺]  concentration is 3.9 × 10⁻⁸ M

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B. The study of matter and energy.

Because physical science is everything that doesn't include organic things.

The  study of matter and energy among the following  best describes physical science.

Matter in chemistry, is defined as any kind of substance that has mass and occupies space that means it possess volume .Matter is composed up of atoms which may or not be of same type.

Atoms are further made up of sub atomic particles which are the protons ,neutrons and the electrons .The matter can exist in various states  of substances such as solids, liquids and gases depending on the conditions of  the temperature and  the pressure.

The states of matter are inter convertible into each other by changing the parameters of temperature and pressure.Matter is always conserved by law of conservation of matter.The law was proposed by Antoine Lavoisier.

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Answer:

has 5, ans 3 decimals.

thats as simple as i can put it.

Answer:

There are two dots are present on the left side of calcium atom which represents the unpaired electrons present in the outermost shell. This structure is presented by Lewis in order to show the number of unpaired electrons in the atom.

Explanation:

The volume of the gold plates in cm₃ is 2.513274 cm₃

Volume is the space occupied by a three-dimensional object“”

Volume = {mass} {density}

Given that the thickness or height of medallion, h = 2 mm = 0.2 cm

Diameter of the medallion, d = 4 cm

Radius of medallion, r = d/2 = 2 cm⁻³

The thickness of the gold plating, x = 1 μm = 10⁻⁴ cm

The density of gold = 19.3 g cm

Now we know that the shape of a medallion is cylindrical.

Hence, the volume of the medallion before platting,

Vbefore = π.r2.h = π.(2)2.0.2 = 2.513274 cm₃

Therefore, the volume of the gold-plated is 2.513274 cm₃.

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Answer:

1,000s

Explanation:

i just multiply it

If a reaction takes 10s to go to completion at 0°C,then 1000s will It take to go at 100°C.

A chemical reaction is a procedure that causes one group of chemical components to change chemically into another.

Combination, decomposition, single-replacement, double-replacement, and combustion are the five fundamental types of chemical reactions. You can classify a reaction into one of these groups by looking at the reactants and products. Several categories will apply to some reactions.

When atoms establish or break chemical bonds, chemical processes take place. Reactants are the substances that begin a chemical reaction, while products are the compounds that are created as a result of the reaction.

Thus,If a reaction takes 10s to go to completion at 0°C,then 1000s will It take to go at 100°C.

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To balance a chemical equation, we have to take into account the coefficients and subscripts that indicate us the number of atoms of each element.

The first element we are going to balance is sodium, in the reactants, there is only one atom and in the products there two atoms of Na, so we have to assign 4 as the coefficient of NaOH and 2 as the coefficient of Na2HPO3.

There are 4 atoms of phosphorus in the reactants and 3 of them in the products. To balance it assign 2 as the coefficient of PH3.

Finally, balance the number of oxygens and hydrogens in the equation. There are 5 atoms of oxygen in the reactans and 6 of them in the products. Assign 2 as the coefficient of H2O, at this points, all the elements are balanced.

The balanced equation is: