\({ }^{59} \mathrm{Co}^{3+}\)

Mass number:

Number of protons:

Number of neutrons:

Number of electrons:

Answer:

Pseudoscience

Explanation:

Predicting the future based solely on the position of the planets is an example of pseudoscience.

Pseudoscience is a body of knowledge that is not based on the scientific method but on some unverifiable/unprovable claims.

Predictions about the future can only be valid if it is based on the scientific method, not just about the position of the planet. The scientific method involves observation, hypothesis formulation, testing of the hypothesis through repeatable experiments, and arriving at conclusion.

Any other statement or belief that is not based on these procedures is said to be pseudoscientific.

Answer:

The answer to your question is pseudoscience.

Explanation:

I took the module 1 exam and got it right, yesterday.

The percentage of a strontium-90 sample that remains after 60.0 years is 3.14%.

It is given that strontium-90 is a byproduct in nuclear reactors fueled by the radioisotope uranium-235. The half-life of strontium-90 is 28.8 years.

To calculate the percentage of a strontium-90 sample that remains after 60.0 years, we can use the formula for half-life:

Amount remaining = Initial amount x (0.5)^(time/half-life)Let us assume that the initial amount of strontium-90 is 100 grams. Then, after one half-life, the amount remaining would be:

Amount remaining = 100 x (0.5)^(28.8/28.8) = 50 gAfter two half-lives (i.e. 57.6 years), the amount remaining would be:Amount remaining = 100 x (0.5)^(57.6/28.8) = 25 gAfter three half-lives (i.e. 86.4 years), the amount remaining would be:Amount remaining = 100 x (0.5)^(86.4/28.8) = 12.5 gAfter four half-lives (i.e. 115.2 years), the amount remaining would be:Amount remaining = 100 x (0.5)^(115.2/28.8) = 6.25 gAfter five half-lives (i.e. 144 years), the amount remaining would be:Amount remaining = 100 x (0.5)^(144/28.8) = 3.13 g

Therefore, the percentage of a strontium-90 sample that remains after 60.0 years is approximately 3.14%.

Summary: After calculating using the formula for half-life, we get the answer that the percentage of a strontium-90 sample that remains after 60.0 years is approximately 3.14%.

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To successfully adjust the pH, as there was no equipment to measure and transfer the correct volume of acid, then A. Use a less concentrated acid to adjust the pH so the required volume would be larger.

This is a substance that changes the taste in water solution and changes blue litmus paper to red, reacts with some metals to liberate hydrogen, reacts with bases to form salts, and promotes chemical reactions (acid catalysis).

Hence because there was no equipment available to measure and transfer the correct volume of acid, the best and safest and most successful thing to be done is to use a less concentrated acid to adjust the pH so the required volume would be larger.

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The molar concentration of a 12% sodium chloride solution is approximately 2.05 M.

To determine the molar concentration of a 12% sodium chloride solution, we need to convert the given percentage concentration into molarity.

First, we need to understand that the percentage concentration refers to the mass of the solute (sodium chloride) relative to the total mass of the solution.

In this case, a 12% sodium chloride solution means that there are 12 grams of sodium chloride in 100 grams of the solution.

To convert this into molar concentration, we need to consider the molar mass of sodium chloride, which is 58.5 g/mol.

We can start by calculating the number of moles of sodium chloride in 12 grams:

Moles of sodium chloride = mass of sodium chloride / molar mass of sodium chloride

Moles of sodium chloride = 12 g / 58.5 g/mol = 0.205 moles

Next, we calculate the volume of the solution in liters using the density of the solution. Since the density is not provided, we assume a density of 1 g/mL for simplicity:

Volume of solution = mass of solution / density

Volume of solution = 100 g / 1 g/mL = 100 mL = 0.1 L

Finally, we calculate the molar concentration (Molarity) by dividing the number of moles by the volume in liters:

Molar concentration = moles of solute / volume of solution

Molar concentration = 0.205 moles / 0.1 L = 2.05 M

Therefore, the molar concentration of a 12% sodium chloride solution is approximately 2.05 M.


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Answer:

Action given and reaction taken

Also known as

Newton's third law of motion

Explanation:

An action will be done such as bouncing a ball on the wall

- You throw the ball (Action)

- The ball bounces back (Reaction)

Hope this Helps

Answer:

C

Explanation:

For electromagnetic waves frequency X wavelength = speed of light

                                                f * 2.2 x 10^-11  = 3 x 10^8  m/s

                                         f = 3 x 10^8 / 2.2 x 10^-11

                                            = 1.36 x 10 ^19

                                             = 1.4 x 10^19   with two significant digits

Answer: it's not C, it is A.

(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:

a )

Fe(NO₃)₂(aq) + AgNO₃(aq)   =   Fe(NO₃)₃(aq) + Ag(s)

Fe⁺² + 3NO₃⁻ + Ag⁺  = Fe⁺³ + Ag + 3NO₃⁻

b )

Reaction is an oxidation - reduction reaction .

oxidation :--

Fe⁺² = Fe⁺³ + e⁻

Reduction : ---

Ag⁺ + e = Ag

c )

Q =  [ Fe( NO₃)₃ ]  /  [ Fe(NO₂) ] [ AgNO₃ ]

Answer:

As

Explanation:

because of ionic bond

Answer: Decreases

Explanation: Hope this helps :)

Answer:

B

Explanation:

it's the second one it's actually easy for me

If a sample of gas has a volume of 2.50 L at 236 kPa and 75.0 °C, the pressure 1.18 atm is required.

Only ideal gas is subject to the ideal gas law; vanderwaal gas is not. Here, Boyle's and Charles' gas laws are combined. As a result, the new gas pressure is 1.18 atm.

The relation between Pressure, volume, and temperature can be given as:

PV = nRT

In which:

P = pressure of  gas

V= volume of gas

n =number of moles of gas

T =temperature of gas

R = Gas constant

= 0.0821 L.atm/K.mol

Combining Boyle's and Charles' gas law

P₁V₁/T₁ = P₂V₂/T₂

{ (5.28atm) (2.50 L)} ÷348 K ={ (P2) (3.75 L)} ÷298 K

P₂ =1.18 atm

Thus, the new pressure of gas is 1.18 atm when the temperature is changed to 348K and volume is increased to 3.75 L.

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Answer:

mannn i told that little brat to stop taking the goldfish outta the box because i want them so he better hope he dies cuz if he dosent imma shove these goldfish down his throat ~respectfully~

Explanation:

The part of neuron which consist the nucleus is the cell body and nucleus is present at the center of cell body.

Neurons are the essential part of the nervous system also known as nerve cell, as they help in the information transportation process.

Neuron have distinct body parts as our human body have like cell body, axon, dendrites, schwann cell, axon, myelin sheath, neural impulse, node of ranvier, axon terminal and synaptic nob.

Among the following parts, cell body is the main and first part of the neuron and in this part dendrites at the outer part and nucleus at the central part is present.

So, nucleus is present at the cell body.

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The functional groups can be identified via IR Spectroscopy, which monitors atom vibrations.

It is feasible to identify the functional groups using IR Spectroscopy, which monitors the atoms' vibrations. 5 Typically, lighter atoms and stronger connections will vibrate with a higher stretching frequency (wavenumber).

IR spectra of solids and liquids are often produced using straightforward liquid cells after the sample has been dissolved in a solvent that is moderately IR transparent, like CCl4. Another method for studying a solid directly involves grinding it into a fine paste using NUJOLTM, a blend of highly pure hydrocarbons.

The process involves passing infrared light through the organic compound we wish to identify; some of the frequencies are absorbed by the compound, and if we keep track of the light that passes through, the precise frequencies of the absorptions may be determined.

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Answer:

well for me it's

Explanation:

The reflection of the seas

Answer:

This question lacks options; the options are:

A) They moved more freely

B) They moved closer together.

C) The average speed increased.

D) The average kinetic energy increased

The answer is B

Explanation:

The water in the beaker is described to be in a liquid state of matter. Its temperature decreases from 50°C to 10°C when placed in a freezer by Kiley. This means that heat is gradually being lost as the liquid water undergoes freezing into a solid state.

When water in a liquid state is freezed, it's molecules, which were moving more freely begin to move closer together because the speed at which the particles in the liquid state moved has been reduced.

The empirical formula of the compound is CH₃N

Mass of C = (12 / 44) × 53

Mass of C = 14.45 mg

Mass of H = (2 / 18) × 32.6

Mass of H = 3.62 mg

Mass of N = (mass of compound) – (mass of C + mass of H)

Mass of N = 35 – (14.45 + 3.62)

Mass of N = 16.93 mg

Divide by their molar mass

C = 14.45 / 12 = 1.204

H = 3.62 / 1 = 3.62

N = 16.93 / 14 = 1.209

Divide by the smallest

C = 1.204 / 1.204 = 1

H = 3.62 / 1.204 = 3

N = 1.209 / 1.204 = 1

Thus, the empirical formula of the compound is CH₃N

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Answer:

It decreases down the group

Explanation:

In group 2 of the periodic table, the value of the electronegativity decreases as we go down the group.

Electronegativity of an element is a property that combines the ability of its atom to lose and gain electrons.

It is a measure of the relative tendency with which atoms of the element attracts valence electrons.

In group 2, the electronegativity decreases downward.

Electronegativity is the ability of an atom to attract the electrons to form a covalent.

The general trend of electronegativity increases across the periods and groups.

The trend of electronegativity of Group 2 can be explained as:

1. In group 2, the electronegativity varies with the increase in the atomic number of the elements. The electronegativity decreases as the atomic number increases.

2. The electronegativity increases because the outer electrons are shielded due to the strong attraction of the nucleus.

3. The highest electronegative element of Group 2 is Be, and the least is Barium.

Thus, the electronegativity decreases down the group with an increase in the atomic number.

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Answer:

Any change that increases the number of particles in a system increases entropy because it increases the randomness and disorder of the system.

Explanation:

Imagine dropping a glass pitcher on a hard surface. The pitcher breaks into numerous shards. If the shards were collected and dropped again, they would tend to break into smaller shards; they would not reassemble themselves into a pitcher. In the universe, there is a tendency for order to be replaced with disorder. This tendency is related to a concept called entropy. The formal definition of entropy is a measure of the degree of randomness and disorder in a system.

Answer:

true!

Explanation:

(alt + F4) might be the answer you are looking

Explanation:

I'm not exactly sure how I came up with this answer but it is for sure the answer

Explanation:

mg2+ would be the smaller ion this is because each ion has the same number of electrons however mg2+ has a greater number of protons and therefore is more charge dense and the outer electrons feel a greater pull from the nucleus.

I hope it's helpful!!

Explanation:

n=,4.5 moles C2H6

the ratio 2:7

4.5:x

x=15.75 moles

Answer:

- Water from beaker will move to the tube

Explanation:

Total percentage of water in the beaker;

\( = { \tt{100\% - 5\%}} \\ = { \tt{95\%}}\)

Total percentage of water in dialysis tube;

\({ \tt{ = 100\% - 15\%}} \\ = { \tt{85\%}}\)

So, there is much water concentration in the beaker than the dialysis tubing, this causes a determined percentage of water to diffuse to the tubing, and determined percentage of salt to move from tubing to the beaker.

Percentage of water moving to tubing;

\({ \tt{ = 95\% - 85\%}} \\ = { \tt{10\%}}\)

Percentage of salt moving from tubing to beaker

\({ \tt{ = 15\% - 5\%}} \\ { \tt{ = 10\%}}\)

Answer:

B no. is the answer because

Explanation:

So this can probably be the the answer

Hope my answer helps