arrange these alkyl iodides according to decreasing rates of their sn1 reactions.

Answer:

Sodium

Explanation:

Explanation: The element with electron configuration 1s22s22p63s1 belong I A group in the periodic table and it is sodium because it loses one electron. We have periodic table in attachments. Sodium is a chemical element with the symbol Na and atomic number 11

Answer:

Explanation:

a)  When the iron rod is heated, it expands (gets larger). That's the key to this whole procedure. It doesn't expand much -- depending on what temperature the iron rod is heated up to.

When the rod looks like it has expanded as much as it can, the rod is tightened as much as it can be tightened before damage is done. When the rod cools, it contracts (gets smaller). That brings the walls closer together or it stops the walls from bulging.

Very interesting question. I've never seen this. Thanks for asking.

Answer:

c) two different elements

Explanation:

A periodic table can be defined as the standard arrangement of chemical elements by atomic number, electronic configuration and chemical properties in a tabular form.

Generally, a proper representation of the mass number and atomic number of chemical elements is key and very important in chemistry.

Furthermore, as a rule, it should be noted that the mass number (nucleon number) is always larger than the atomic number(number of proton).

In the periodic table, all chemical elements are identified based on number of protons because it represents the atomic number.

This ultimately implies that, numbers of protons (atomic numbers) is used to differentiate an atom of one chemical element from the atom of another chemical element.

Hence, two atoms with different numbers of protons are two different elements.

For example, Hydrogen has one proton while Oxygen has 8 protons.

The two ways in which the physical state of matter can be changed are melting and freezing.

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Answer:

its accurate

Explanation:

it says organic produce which means that no chemicals or pesticides or fertiliser were used in growing or harvesting the plant

Answer:

Atomic number and

mass number

Isotopes are atoms of the same element that have different numbers of neutrons. Based on this definition, the pair of isotopes among the given options is C) ²⁸Si and ²⁹Si. Isotope ²⁸Si has 14 protons and 14 neutrons, while isotope ²⁹Si has 14 protons and 15 neutrons.

These isotopes have the same number of protons, indicating that they belong to the same element, silicon (Si), but they differ in the number of neutrons.

Option A) ²⁸Si and ²⁸Si⁴⁺ represents an ion of silicon, not an isotope. The presence of a positive charge indicates the loss of electrons.

Option B) ²⁸Si and ²⁸Al represent different elements, silicon and aluminum, respectively, so they are not isotopes.

Option D) ²⁸Si and ²⁸Si⁴⁻ represents an anion of silicon, not an isotope. The presence of a negative charge indicates the gain of electrons.

Option E) ²⁸Si⁴⁺ and ²⁸Al³⁺ represent different elements, silicon and aluminum, respectively, so they are not isotopes.

Therefore, the correct answer is C) ²⁸Si and ²⁹Si, which represent isotopes of silicon.

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The millimolar concentration of ethanol in the bloodstream of a person with a blood alcohol content of 0.08% w/v is 17.4 mM.

What is the blood alcohol content?

Blood alcohol content (BAC) is a measure of the concentration of alcohol in a person's bloodstream. It is typically expressed as a percentage, either as weight/volume (w/v) or as volume/volume (v/v).

BAC is affected by various factors such as the amount of alcohol consumed, the rate of alcohol metabolism, body weight, gender, and other individual characteristics.

To calculate the millimolar concentration of ethanol in the bloodstream, we first need to convert the blood alcohol content (BAC) from weight/volume percentage to molarity.

Convert the blood alcohol content (BAC) from weight/volume percentage to grams of ethanol per liter of blood:

BAC = 0.08%

w/v =\(\frac{ 0.08 g}{100 mL}\)

= 0.8 g/L

Calculate the molarity (M) of ethanol:

Molarity (M) = \(\frac{mass\ of \solute\ in\ grams}{molar&mass of solute\ in\ g/mol \ or\ volume\ of solution\ in \liters}\)

We know the molar mass (Mw) of ethanol is 46 g/mol, and the BAC is 0.8 g/L:

Molarity (M) = \(\frac{0.8 g/L}{46 g/mol}\)

= 0.0174 mol/L

Convert molarity to millimolar concentration:

Millimolar concentration = Molarity (M) × 1000 Millimolar concentration

= 0.0174 mol/L × 1000

= 17.4 mM

Therefore, the millimolar concentration of ethanol in the bloodstream of a person with a blood alcohol content of 0.08% w/v is 17.4 mM.

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The triple point can be seen from the graph that has been attached here.

The triple point is a special combination of temperature and pressure where the equilibrium of a substance's three phases—solid, liquid, and gas—occurs. The transition between phases happens with no discernible net change in the substance because the solid, liquid, and gas phases are in perfect equilibrium at the triple point.

A crucial reference point in thermodynamics, the triple point is frequently used to specify temperature scales and calibrate thermometers. Each substance has a specified value for temperature and pressure.

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Answer:

It appears to be

Explanation:

I did that question.

The 1000 kg ball would have 62500 J of kinetic energy; The 10 kg ball would have 125 J of kinetic energy; The 100 kg person would also have 1250 J of kinetic energy.

Kinetic energy is the energy an object possesses due to its motion. It is defined as the energy that an object has as a result of its motion, and is dependent on the mass and velocity of the object.

To calculate the kinetic energy of an object, we use the formula:

KE = \(1/2 * m * v^{2}\)

where m is the mass of the object and v is its velocity.

Given that a 100 kg ball is traveling at 5 m/s, we can calculate its kinetic energy:

KE = \(1/2 * 100 kg * (5 m/s)^2\) = 1250 J

Using the same formula, we can calculate the kinetic energy for the following scenarios:

A 1000 kg ball traveling at 5 m/s:

KE =\(1/2 * 1000 kg * (5 m/s)^2\)= 62500 J

The 1000 kg ball would have 62500 J of kinetic energy, which is 50 times greater than the kinetic energy of the 100 kg ball.

A 10 kg ball traveling at 5 m/s:

KE = \(1/2 * 10 kg * (5 m/s)^2\)= 125 J

The 10 kg ball would have 125 J of kinetic energy, which is 10 times smaller than the kinetic energy of the 100 kg ball.

A 100 kg person traveling at 5 m/s:

KE = \(1/2 * 100 kg * (5 m/s)^2\) = 1250 J

The 100 kg person would also have 1250 J of kinetic energy, which is the same as the kinetic energy of the 100 kg ball.

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The mass of each gas is needed to produce the pressure of 135 atm in the respective tank at 24 °C is mass of helium  = 4426.92 g and the mass of hydrogen gas = 2213.46 g

The Pressure = 135 atm

The Temperature = 24 °C = 297.15 K  

The Volume = 200 L

The Number of moles = ?

The ideal gas equation is expressed as:

PV = nRT

where,  

P is the pressure

V is the volume

n is the number of moles

T is the temperature  

R is Gas constant having value = 0.082 L.atm/K.mol

135 atm × 200 L = n × 0.082 L.atm/K.mol × 297.15 K  

n = 1106.73 moles

The molar mass of  helium gas =  4 g/mol

The molar mass of hydrogen gas =  2 g/mol

The mass of hydrogen = moles × molar mass

                                      = 1106.73 × 2

                                      = 2213.46 g

The mass of helium = moles × molar mass

                                  = 1106.73 × 4

                                  = 4426.92 g

This question is incomplete, the complete question is :

Suppose two 200.0-L tanks are to be filled separately with the gases helium and hydrogen. What mass of each gas is needed to produce a pressure of 135 atm in its respective tank at 24 °C?

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To solve this question we need to use the combined gas law:

sufix 1 reffears to the initial state and sufix 2 reffears to the final state. P is pressure, V volume and T temperature (in Kelvin). They are asking for the pressure at the final state (P2) and they give the initial conditions: P1= 1atm, V1=1L T1=25°C=298K and the final temperature T2=1000°C= 1273 K. They alse say that the Volume is fixed so V2=V1=1L. then we just have to substitute the values into the eqaution:

Then solve P2. P2 = 4.272 atm

Given: Volume of solution, V = 10 mLConcentration of solution, C = 0.5 mol/L.

With this, we can convert the volume from mL to L by dividing it by 1000. Therefore,V = 10 mL = 10/1000 L = 0.01L. Now, we can use the formula: n = C x V where,n = number of moles C = concentration of solutionV = volume of solution. Plugging in the values, we get,n = 0.5 mol/L x 0.01 L= 0.005 mol. In chemistry, mole is defined as a unit for measuring amount of substance. The symbol used for mole is 'mol'. This unit helps to express the number of particles in a sample of substance. For instance, one mole of a substance contains 6.022 x 10²³ particles of that substance.A solution is a homogeneous mixture of two or more substances. The concentration of a solution refers to the amount of solute present per unit volume of the solution. It is usually expressed in moles per litre (mol/L) or molarity.

Molarity is defined as the number of moles of solute present in one litre of solution. It is given by the formula:M = n/Vwhere,M = molarity of the solutionn = number of moles of solute presentV = volume of the solution in litresIn the given question, we are given the volume of solution and its concentration. Therefore, we can use the formula:M = n/Vto find the number of moles of HCl present in 10 mL of a solution with a concentration of 0.5 mol/L. There are 0.005 moles of HCl present in 10 mL of a solution with a concentration of 0.5 mol/L.

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Answer:

Zinc (Zn) will safely react with dilute sulphuric acid.

Explanation:

If correct please give brainliest

Stay safe and healthy

Thank You

Answer:

kindly check the attach file for the drawing of the chemical structures.

Explanation:

So, we are going to start from the compound D, which is stated in the question to be optically active. Therefore, we will have that:

STEP ONE: THE OXIDATION OF COMPOUND A, C6H12O2 TO GIVE COMPOUND C.

The oxidation of compound A,C6H12O2 gives another chemical compound that is chemical compound C which is a optical inactive di-carboxylic acid. The chemical equation is given below:

C6H12O2 + H2Cr2O4 --------------------------------------------> HOOCCH2CHCH3CH2COOH.

STEP TWO: THE OXIDATION OF COMPOUND A, C6H12O2 TO GIVE COMPOUND B.

The oxidation of compound A,C6H12O2 gives another chemical compound that is chemical compound C which is a optically active acid. The chemical equation is given below:

C6H12O2 + Ag(NH3)2^+ -----------------------------> C6H12O3.

Since the question asked us to give the structures of Compound A,B and C there is no need to to show the chemical reaction for compound D.

Kindly check the picture below for the chemical structures.

When the gas is heated from -50°C to 28°C, the new volume is approximately 17.24 L.

To calculate the new volume of a gas when it is heated from -50°C to 28°C, we can use the combined gas law, which relates the initial and final conditions of temperature and volume.

The combined gas law is expressed as:

(P1 * V1) / T1 = (P2 * V2) / T2

Where:

P1 = Initial pressure

V1 = Initial volume

T1 = Initial temperature in Kelvin

P2 = Final pressure (assumed constant in this case)

V2 = Final volume (to be calculated)

T2 = Final temperature in Kelvin

First, we need to convert the initial and final temperatures from Celsius to Kelvin:

Initial temperature in Kelvin (T1) = -50°C + 273.15 = 223.15 K

Final temperature in Kelvin (T2) = 28°C + 273.15 = 301.15 K

Since the pressure is assumed to be constant, we can simplify the equation:

(V1 / T1) = (V2 / T2)

Now we can substitute the given values into the equation:

(12.78 L / 223.15 K) = (V2 / 301.15 K)

Cross-multiplying and solving for V2:

V2 = (12.78 L * 301.15 K) / 223.15 K

V2 ≈ 17.24 L

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We can see that when the solvent evaporates away from a solution, the evaporating molecules will draw heat in from their surroundings. The flask and the solution will start to get colder.

A solvent is a substance capable of dissolving other substances to form a solution. It is the component of a solution that is present in the largest quantity and serves as the medium for dissolving solutes. Solvents can exist in various states, including liquids, gases, or even solids in some cases.

In a solution, the solvent is responsible for dispersing, dissolving, or suspending the solute particles. It surrounds the solute particles and interacts with them through various intermolecular forces.

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The complete question is:

When the solvent evaporates away from a solution, the ________.

Answer:

2

Explanation:

The only metal with a known primordial crystal structure is polonium. A polonium atom has an atomic radius of 167 pm and a density of 9.32 g/cm3.

A polonium atom's density and atomic weight may be used to determine its atomic radius. Since polonium has an atomic weight of 209 u, it has a molecular weight of 209 g/mol. This is comparable to 6.022 x 1023 atoms/mol using Avogadro's number. In terms of mass per unit volume, polonium has a density of 9.32 g/cm3, or 9.32 x 103 kg/m3. The atoms are organised in a straightforward cubic lattice due to the polonium's fundamental crystal structure. The volume of a cube formula (4/3)r3 = V, where V is the molar volume (atomic weight/density) divided by Avogadro's number, may be used to determine the radius of a polonium atom. An estimate of 167 pm for the radius is obtained by solving for r.

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The mass percent of glycerol in the solution is approximately 2.55%.

Explanation:

The mass percent of glycerol in the solution can be calculated as shown below:

First, the mass of the solution can be calculated using the following formula:

Mass of the solution = Density of the solution x Volume of the solution

The volume of the solution is not given, so let us assume a volume of 1 liter (1000 ml) of the solution, which is a common assumption.

Therefore, Mass of the solution = 1.1663 g/ml x 1000 ml= 1166.3 g

Next, the mass of glycerol in the solution can be calculated using the mole fraction and molecular weight of glycerol. The molecular weight of glycerol (C3H8O3) can be calculated as follows:

Molecular weight of glycerol (mm of C3H8O3) = 3 x atomic weight of C + 8 x atomic weight of H + 3 x Atomic weight of O= 3(12.01) + 8(1.008) + 3(16.00) = 92.09 g/mol

Now, the mass of glycerol in the solution can be calculated using the following formula:

Mass of glycerol = Mole fraction of glycerol x Mass of the solution x Molecular weight of glycerol Mass of glycerol = 0.258 x 1166.3 g x 92.09 g/mol= 29.70 g

Finally, the mass percent of glycerol in the solution can be calculated using the following formula:

Mass percent of glycerol = Mass of glycerol / Mass of the solution x 100%Mass percent of glycerol = 29.70 g / 1166.3 g x 100%≈ 2.55%

Therefore, the mass percent of glycerol in the solution is approximately 2.55%.

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The element that is most likely to pair with beryllium in a 1:1 relationship based on valence electron trends would be Se ( 6 valence electrons ). That is option A.

Valence electron is defined as the electron of an atom that is located at the outermost shell which takes part in formation of chemical bonding during a chemical reaction.

The number of Valence electron of the element beryllium = 2

The number of Valence electron of the selenium = 6

Therefore, both beryllium and selenium can form a chemical bond in a 1:1 relationship based on valence electron trends as both will complete their outer most shell into 8 electrons.

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7.296 x 102 in scientific notation 23x1011 is obtained by dividing by 3.6 x 109.

Very big or very low numbers can be written using scientific notation. Once a number within 1 and 10 has been multiplied by such a power of 10, it is then expressed in scientific notation. For instance, the scientific notation for 650,000,000 is 6.5 108.

A system of symbols and signs is used in notation to represent words, numbers, sentences, etc. The efficient communication of words, figures, and other objects is greatly aided by notation, which is frequently created for a specific purpose. Music notation is a prime example of notation.

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Answer:

Industrial activity increases the emission of greenhouse gases in the atmosphere, especially carbon dioxide (CO2), and it negatively affects climate by increasing global warming.

Two actions to face the global warming:

1- To substitute the use of fossil fuels by alternative clean energy sources such as, for example, hydroelectric, geothermal, solar and wind energy resources.  

2- The government's policies decided to develop electric cars and to stimulate healthy habits such as walking instead of the use of conventional fossil-fueled transport modes.

Answer:

a) 29.0 years

b) 0.89 g

Explanation:

Using the formula

t1/2= t×ln2/ln(No/Nt)

Where

Nt= mass of radioactive isotope at time= t =0.953g

No= initial mass of radioactive isotope present= 1.000g

t= time taken for N mass of radioactive isotope to remain = 2 years

t1/2 = half-life of radioactive isotope= ???

Substituting the values

t1/2= 2 × ln2/ln(1.000/0.953)

t1/2= 2× 0.693/0.048

t1/2= 29 hours

b)

N= No(1/2)^t/t1/2

Where t= 5 years

N= 1.000(1/2)^5/29

N= 1.000(1/2)^0.17

N= 0.89g

Answer:

A and C represent elements while B and D represent Compounds

Explanation:

chemical elements cannot be broken down into simpler substances by any chemical reaction. While A chemical compound is a chemical substance composed of many identical molecules composed of atoms from more than one element held together by chemical bonds