What is recycling?

A
to use materials again and again to make something new.
b
produce new brand products and sell them.
c
living in the developed world but taking care of nature.

The appropriate symbol for an isotope of potassium-39 using isotope notation would be written as "39K".

The isotope notation, also known as nuclear notation, is used to represent different isotopes of an element. It consists of the element's atomic number (Z), the element's symbol (A), and the mass number (X). The atomic number represents the number of protons in the nucleus of an atom and is used to determine the element to which an atom belongs. The mass number represents the total number of protons and neutrons in the nucleus of an atom. The symbol represents the element to which the isotope belongs.

In this case, 39 is the mass number (X) and K is the symbol of the element Potassium (A).

So, in isotope notation for Potassium-39 it would be represented as 39K.

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Dispersion forces are very weak electrostatic attractions that occur due to the random electronic motion within all substances, including - those that are nonpolar.

Dispersion force is also called an induced dipole-induced dipole attraction.

The London dispersion force is the weakest intermolecular force.

The London dispersion force (intermolecular force) is a temporary attractive force between molecules.

Dispersion forces make nonpolar substances (for example oxygen, nitrogen) to condense to liquids and freeze into solids in low temperatures.

In nonpolar bonds the arrangement of electrons are in the middle between two atoms.

For example, nitrogen molecule (N₂) has strong nonpolar triple covalent bond (:N:::N:), that is why it is very stable and have low reactivity.

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In the above intermediate chemical equation, oxygen will appear as follows: O₂(g) as a reactant (option B).

A chemical equation in chemistry is a symbolic representation of a chemical reaction where reactants are represented on the left, and products on the right.

According to this question, an intermediate chemical equation is presented as follows:

As observed in the above chemical equation, oxygen will react in its gaseous form i.e. as a reactant.

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The total enthalpy being released if 7.0 mol of H2 is combusted is: ∆Hc = -2.002 kJ/mol. Hence, this is an exothermic reaction.

The combustion of 7 mol of H2 can be stated as the chemical equation below:

7H2(g) + 7/2O2(g) --> 7H2O(g)

We can calculate the total enthalpy by using the standard enthalpy of formation (∆H0f) of each compound.

∆Hc = ∑∆Hf product - ∑∆H reactant

∆Hc = (7 x ∆Hf H2O) – (7 x ∆Hf H2 + 7/2 x ∆Hf O2)

∆Hc = 7(-286 kJ/mol) – (7(0) + 7/2(0))

∆Hc = -2.002 kJ/mol

So, the enthalpy of combustion of 7 mol of H2 is -2.002 kJ/mol. This is an exothermic reaction because its ∆Hc value is negative, which that indicates energy flows from the system to the surroundings.

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12.0 milliliters of 3.0 M NaOH is required to react with 4.0 mL of 16.0 M HNO3.

The given reaction is HNO₃ + NaOH → NaNO₃ + H₂O. Here, we need to find the volume of NaOH required to react with HNO₃. We can use the formula of the molarity equation: Number of moles = Molarity × Volume. We need to find the number of moles of HNO₃ in 4 mL of 16 M HNO₃. Number of moles of HNO₃ = Molarity × Volume= 16 mol/L × 4 mL/1000 mL/L= 0.064 moles.

Now, we need to use the balanced chemical equation to find the number of moles of NaOH required to react with HNO₃. HNO₃ + NaOH → NaNO₃ + H2O. 1 mole of HNO₃ reacts with 1 mole of NaOH0.064 moles of HNO₃ reacts with x moles of NaOH x = 0.064 moles. So, the number of moles of NaOH required is 0.064 moles. Now, we can use the molarity equation to find the volume of NaOH required. Volume = Number of moles/Molarity= 0.064 moles/3.0 mol/L= 0.02133 L or 21.33 mL.

Therefore, the volume of 3.0 M NaOH required to react with 4.0 mL of 16.0 M HNO₃ is 12.0 mL.

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Television technology has evolved from the process of analogue to the process of digital signal transmission.

We know that technology has to do with the correct application of the scientific knowledge so as to solve practical problems. The chemical engineer is ultimately involved in the process of problem solving the society.

The television technology has evolved from the analogue transmission of the signals when I was a child to the digital transmission of signals thus most of the television stations now do digital transmission.

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Answer:

The enthalpy of reaction is -185 kJ

Explanation:

To get the reaction:

 H₂(g) + Cl₂(g) → 2 HCl(g)

you must follow the following steps:

1)  Reactive molecules must break their bonds to obtain their atoms.

H₂(g) → 2 H(g)

Cl₂(g) → 2 Cl(g)

Bond energy (or enthalpy) is the energy required to break one mole of bonds of a gaseous substance. In the case of diatomic molecules with a single bond, it corresponds to the energy necessary to dissociate 1 mole of said substance in the atoms that form it.

Whenever you want to break links you must supply energy, so the link enthalpy will have positive values; while when a mole of bonds is formed energy is released and the bond enthalpy of this process will be negative.

In this case you will then have:

H₂(g) → 2 H(g)           ΔH=436 kJ/mol

Cl₂(g) → 2 Cl(g)         ΔH=243 kJ/mol

So the total energy needed to break all the bonds is:

ΔH=1 mol*436 kJ/mol +1 mol* 243 kJ/mol= 679 kJ

2) The atoms that were obtained in the break of the bonds must be combined to obtain the product.

2 H (g) + 2 Cl (g) → 2 HCl (g)

Being the single bond energy for one mole of 431 kJ H-Cl bonds and considering that two moles of H-Cl bonds are formed, the ΔH is:

ΔH = -2 moles* (432 kJ/mol) = -864 kJ

As mentioned, when a mole of bonds is formed energy is released, the bond enthalpy of this process will be negative.  So the formation of HCl is negative.

Hess's law states that the energy change in an overall chemical reaction is equal to the sum of the energy changes in the individual reactions comprising it. So:

ΔHtotal= -864 kJ + 679 kJ

ΔHtotal= -185 kJ

The enthalpy of reaction is -185 kJ

Answer:

their made of co2 ice as well as water ice

The number of moles of water that would be produced will be 4 moles

From the balanced equation of the reaction:

2H2 + O2 ---------> 2H2O

Mole ratio of H2 and H2O = 2:1

Mole of H2 = 8 moles

Equivalent mole of H2O = 8/2

                                         = 4 moles

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Answer:

I gotthe answer

Explanation:

The explanation is This

Now writing the value in sentific term

It would look like

\(4.76 \times {10}^{2} \times {10}^{ - 9} \)

\(4.76 \times {10}^{2 - 9} \)

4.76

\(4.76 \times {10}^{ - 7} \)

Now in centimeter

\(4.76 \times {10}^{ - 5} \)

PLEASE MARK ME BRAINLIEST IF MY ANSWER IS CORRECT PLEASE

Answer: Potassium is 39.10 g/mol

Explanation: The numbers below the element are the molar mass.

Answer: Potassium(K): 39.10 g/mol

Explanation:

The amount of maximum mass of ethyl alcohol that could we boil with 1000 J of heat, starting from 20°C is 7.08 grams.

Mass of the ethyl alcohol will be calculated by using the below equation as:

Q = mcΔT, where

On putting all these values, we get

m = 1000 / (2.42)(58.37) = 7.079 = 7.08g

Hence required mass of ethyl alcohol is 7.08grams.

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Answer:

A volcanic "hotspot" is an area in the mantle from which heat rises as a thermal plume from deep in the Earth. High heat and lower pressure at the base of the lithosphere (tectonic plate) facilitates melting of the rock. This melt, called magma, rises through cracks and erupts to form volcanoes.

Answer:

0.158 moles KMnO4

Explanation:

According to the Periodic Table,

K = 39.10 g/mol

Mn = 54.94 g/mol

O = 16.00 g/mol

KMnO4 = 39.10 g/mol + 54.94 g/mol + 4(16.00 g/mol) = 158.04 g/mol

25.0 grams KMnO4              1 mole

-----------------------------  x --------------------------  = 0.158 moles KMnO4

                                          158.04 grams

Answer:

Towards the products, or to the right

Explanation:

There are no provided answer choices, but the answer should be to the right.

By Le Chatelier's principle, which basically can be summarized as "if you mess with chemistry, chemistry messes back", if more reactants are added, the equilibrium will shift to the right towards the products in order to make more products and counteract the increase in I₂.

Answer:

Below in bold.

Explanation:

The equation is:

K2CO3 + 2HCl ---->  2KCl + CO2 + H2O

So 1 mole of K2CO3 produces 1 mole of CO2.

Number of moles of K2CO3 in the solution

= 0.25 * 26.10 / 1000

= 0.00625 moles

This produces 0.00625 moles of CO2

which is 0.00625*44

= 0.2871 grams.

Answer:

identify the atoms on each side.

Count the atoms on each side.

Use coefficients to increase the atoms on each side.

Check to make sure you have the same number of each type of atom on each side.

Explanation:

The concept behind balancing chemical equations is to ensure that they comply with the law of conservation of matter. This helps to make chemical equations quantitatively meaningful.

The subscript of the formula must not be changed in an attempt to balance a chemical equation.

The number of moles of sugar C₆H₁₂O₆ needed to make 4L of saturated solution having a concentration of 0.6M is 2.4 moles.

To find the number of moles of sugar C₆H₁₂O₆ needed to make 4 L of a saturated solution having a concentration of 0.6 M, we can use the formula for molarity, which is given by;

Molarity = Number of moles of solute / Volume of solution in liters (L)

Rearranging the formula to solve for the number of moles of solute gives:

Number of moles of solute = Molarity × Volume of solution in liters (L)

Now we can substitute the values given in the question:

Number of moles of C₆H₁₂O₆ = 0.6 M × 4 L = 2.4 moles

Therefore, 2.4 moles of C₆H₁₂O₆ are needed to make 4 L of a saturated solution having a concentration of 0.6 M.

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The atomic number of of an element is the number of electrons of its neutral atom. The number of electrons and protons in a neutral atom is equal. Thus the number of protons and neutrons in of an element with atomic number 80 is 80.

Atoms are the basic units  of every substances. All elements are made of their atoms. Atoms are composed of subatomic particles called electrons, protons and neutrons.

The protons and neutrons are located inside the nucleus and the electrons are revolving around the nucleus through circular paths of fixed energies. Electrons are negatively charged particles and protons are positively charged. Whereas neutrons are neutral.

All the positive charges in the nucleus is neutralized by equal number of negative charges. The atomic number of an element is the number of its electrons in the atomic state where the number of protons equals the number of electrons.

Therefore, the number of electrons and protons are 80 for the element with atomic number 80 and it is named as mercury (Hg).

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The pieces of equipment used in the distillation setup utilized in the procedure include: a thermometer adapter, a round-bottomed flask, a distillation head, and a reflux condenser.


All these components play essential roles in the distillation process. The round-bottomed flask holds the liquid mixture, the distillation head separates vapor components, the thermometer adapter monitors the temperature, and the reflux condenser cools and condenses the vapors back into liquid form.

Thermometer adapter: This adapter allows for a thermometer to be inserted into the distillation apparatus to monitor the temperature of the distillate. Round-bottomed flask: This flask is used to hold the liquid mixture that is being distilled. It has a rounded shape that allows for more efficient heating and mixing.

Distillation head: This is the main part of the distillation apparatus, which connects the round-bottomed flask to the condenser. It is designed to ensure that the vapor produced during the distillation process is condensed and collected.

Reflux condenser: This is a type of condenser that is used in distillation to condense the vapor back into liquid form. It works by circulating a coolant through a coiled tube, which is surrounded by the vapor.

In summary, the distillation setup typically includes a thermometer adapter, a round-bottomed flask, a distillation head, and a reflux condenser. These pieces of equipment work together to separate a liquid mixture into its individual components through the process of distillation.

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Answer:

It lets people prepare for future weather hazards:

- If, in certain months and on certain dates, the past data shows that there's a history of rain or heat stroke on those days, people can prepare in the future for those events.

- They can also expect wind speeds, temperatures and stuff like that!

Answer:

20.05  ×10²³ molecules

Explanation:

Given data:

Mass of hydrogen = 10 g

Number of molecules of ammonia = ?

Solution:

Chemical equation:

3H₂ + N₂       →      2NH₃

Number of moles of hydrogen:

Number of moles = mass / molar mass

Number of moles =  10 g /  2 g/mol

Number of moles =  5 mol

now we will compare the moles of hydrogen and ammonia.

                 H₂            :           NH₃

                  3             :            2

                   5            :           2/3×5 = 3.33 mol

Number of molecules of ammonia:

1 mole contain 6.022 ×10²³ molecules

3.33 mol × 6.022 ×10²³ molecules / 1 mol

20.05  ×10²³ molecules

The pressure changes from 1.00 atm to approximately 1.033 atm when the gas is heated from 30.0 °C to 40.0 °C at a constant volume.

To determine the pressure change when a constant volume of gas is heated, we can use the Ideal gas law:

PV = nRT

Where:

P = Pressure

V = Volume (constant in this case)

n = Number of moles of gas (constant in this case)

R = Ideal gas constant (0.0821 L·atm/(mol·K))

T = Temperature in Kelvin

We need to convert the temperatures from Celsius to Kelvin:

T1 = 30.0 °C + 273.15 = 303.15 K

T2 = 40.0 °C + 273.15 = 313.15 K

Since the volume and number of moles of gas are constant, we can rewrite the ideal gas law equation as:

P1/T1 = P2/T2

Now we can plug in the given values and solve for P2, which represents the pressure at the new temperature:

P1 = 1.00 atm

T1 = 303.15 K

T2 = 313.15 K

(1.00 atm) / (303.15 K) = P2 / (313.15 K)

Cross-multiplying and solving for P2:

P2 = (1.00 atm) × (313.15 K) / (303.15 K)

P2 ≈ 1.033 atm

Therefore, the pressure changes from 1.00 atm to approximately 1.033 atm when the gas is heated from 30.0 °C to 40.0 °C at a constant volume.

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If an alkaline developer is used in dye penetrant inspections, it can cause the dye to wash out, making it difficult or impossible to detect any flaws or defects in the surface being inspected.

The alkaline developer can also react with the dye, altering its chemical properties and making it ineffective for future inspections.

This can lead to inaccurate or incomplete inspections, which can have serious consequences if the surface being inspected is critical for safety or performance.

It is important to always use the correct type of developer for the specific dye penetrant being used to ensure accurate and reliable results.

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Answer:

put it in your graphing calculator

(i) The vehicle outputs approximately 11.58 kg of CO₂ per week. (ii) The Biofuel Obligation Scheme in Ireland is implemented by requiring fuel suppliers.

To calculate the amount of CO₂ output per week, we need to determine the amount of fuel used and then use the given combustion equation to find the ratio of CO₂ produced per unit of fuel.

Given;

Average fuel efficiency: 7.5 km per litre

Distance traveled per week: 300 km

Mass of fuel per litre: 0.75 kg

First, we calculate the total fuel used per week;

Fuel used = Distance traveled / Fuel efficiency

= 300 km / 7.5 km per litre

= 40 litres

Next, we find the mass of fuel used per week:

Mass of fuel used = Fuel used × Mass of fuel per litre

= 40 litres × 0.75 kg per litre

= 30 kg

Using the combustion equation, we know that 2 moles of C₈H₁₈ produce 16 moles of CO₂. Therefore, we can calculate the moles of CO₂ produced from the given mass of fuel;

Moles of CO₂ produced = Moles of C8H18 × (16 moles of CO₂ / 2 moles of C₈H₁₈)

= (30 kg / (114 g/mole)) × (16 moles of CO₂ / 2 moles of C₈H₁₈)

= (30,000 g / 114 g/mole) × (16 moles of CO₂ / 2 moles of C₈H₁₈)

= 263.16 moles of CO₂

Finally, we convert the moles of CO₂ to kilograms;

Mass of CO₂ produced = Moles of CO₂ produced × Molar mass of CO₂

= 263.16 moles × (44 g/mole)

= 11,579.04 g

= 11.58 kg (rounded to two decimal places)

Therefore, the vehicle outputs approximately 11.58 kg of CO₂ per week.

The Biofuel Obligation Scheme in Ireland is implemented by requiring fuel suppliers to include a certain percentage of biofuels in their overall fuel sales, thereby reducing the carbon footprint by promoting the use of renewable and lower-carbon-emitting fuels.

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Answer:

Explanation:

Go to a craft store and buy so me material that are biodegradable

A coffee cup temperature  with a heat capacity of 6. 70 J/∘ C was used to measure the change in enthalpy of a precipitation reaction.The value of ΔHrxn was found to be 61.9 kJ/mol.

Calculate the enthalpy of reaction, ΔHrxn, per mole of precipitate formed (AgSCN). Assume the specific heat of the product solution is 4. 11 J / (g⋅∘C) and that the density of both the reactant solutions is 1. 00 g/mL.1. Calculation of Moles of precipitate formed from AgNO3:To find the value of ΔHrxn, we used the formula ΔHrxn = Qsolution/n, where Qsolution is the heat change produced by the solution process and n is the number of moles of AgSCN formed.

To find the value of n, we first calculated the number of moles of AgNO3 and KSCN used in the reaction using the formula n = M × V.To find the heat change produced by the solution process, we used the formula

Q = m × c × ∆T,

where Q is the heat change, m is the mass of the product solution, c is the specific heat capacity of the product solution, and ∆T is the change in temperature of the solution.The value of ΔHrxn was found to be 61.9 kJ/mol.

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