at the beginning of an experiment, a scientist has 236 grams of radioactive goo. after 210 minutes, her sample has decayed to 14.75 grams. what is the half-life of the goo in minutes? find a formula for , the amount of goo remaining at time . how many grams of goo will remain after 5 minutes?

The change in pressure or difference here is  due to the changes in air density  since air density is related to temperature, the Warm air is less dense  compare to cooler air, in getting  wind there needs to be a pressure gradient,  so that there will be higher pressure than the other. Wind will then start blowing from the high pressure to the low pressure.

One side will have a higher pressure compare to the other  ans this can be attributed to how the wind requires a pressure gradient then wind will begin to blow from the area of high pressure to that of low pressure.

It should be noted that the density and temperature of air masses are two factors that affect changes in air pressure.

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Making both reactants in excess and the concentration of Fe(SCN)* can be determined, Making FeSt in excess and SCN as the limiting reactant and the concentration of Fe(SCN)* will be equal to the concenation of SCN.

A reagent, sometimes known as an analytical reagent, in chemistry is a substance or compound supplied to a system to either initiate a chemical reaction or test whether one happens. Although the terms "reactant" and "reagent" are not frequently used interchangeably, "reactant" refers to a material that is consumed during a chemical reaction. The anion [SCN] is thiocyanate. Thiocyanic acid's conjugate base is it. The colorless compounds potassium thiocyanate and sodium thiocyanate are examples of common derivatives. In the past, pyrotechnics employed mercury(II) thiocyanate. Thiocyanic acid is a hydracid, which is cyanic acid in which the oxygen is substituted by a sulfur atom. SCN is a tiny, very acidic [1] pseudohalide thiolate.

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Answer:

c

Explanation:

its the only one with a downside to solar and wind.

Answer:

1/2 or 50%

Explanation:

The probability would be 1/2 or 50%.

Color blindness is generally an X-linked recessive traits. Since males only have one X chromosome, they are either affected or not affected but females with two X chromosomes can be a carrier in addition to being affected or unaffected.

Also, males usually get their X chromosomes from their mothers while the two X chromosomes in females are contributed by each parents.

Let the allele for colour blindness be b.

Genotype of Steve would be \(X^bY\)

Since, they produced a male child with color blindness, Mary is a carrier with the genotype: \(X^BX^b\)

\(X^bY\)   x   \(X^BX^b\)

progeny: X^BX^b (carrier female), X^bX^b (affected female), X^BY (unaffected male), and X^bY (affected male)

Probability of producing color blind children = 2/4 = 1/2

Hence, the probability of their new born baby being color blind remains 1/2 or 50%

Answer:A

Explanation:

Answer:

pretty sure that would physical

The graph shows the distribution of energy in the particles of two gas samples at different temperatures, T1 and T2. A, B, and C represent individual particles.

Most of the gas particles have either very high or very low kinetic energies.Explanation:Here is the graph that describes the energy in particles of two gas samples at different temperatures, T1 and T2:Description of the graph: The x-axis of the graph shows the title Kinetic Energy. The y-axis of the graph shows the title Number of Particles. Two inverted graph curves run close to each other. One of the curves labeled T1 is slightly more spread out than the other labeled T2. A vertical line perpendicular to the x-axis is shown, which is labeled Activation Energy. A point labeled B is shown on the right side of the vertical line. A point labeled A is shown in the lower left side of the vertical line. A particle labeled C is shown in the upper left side of the vertical line.

According to the graph, the activation energy required for the reaction is quite high, and most of the gas particles have either very high or very low kinetic energies. In option A, it is not sure whether Particle B will participate in the reaction or not. Hence, option A is not correct. In option B, it is not sure whether Particle C will participate in the reaction or not. Hence, option B is not correct. In option D, it is not given that at which temperature (T1 or T2) more gas particles participate in the reaction.  Option C is correct because it is given in the graph that most of the gas particles have either very high or very low kinetic energies.

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36.2 grammes of Cl₂ can be produced at maximum yield from the specified reactants.

To determine the maximum yield of Cl₂, we need to first write a balanced chemical equation for the reaction between KMnO₄ and HCl. The balanced equation is:

2 KMnO₄ + 16 HCl → 2 MnCl₂ + 5 Cl₂ + 8 H₂O + 2 KCl

From the balanced equation, we can see that 2 moles of KMnO₄ react with 16 moles of HCl to produce 5 moles of Cl₂. We can use this information to calculate the theoretical yield of Cl₂.

Step 1: Convert the given masses of KMnO₄ and HCl into moles using their respective molar masses.

70.0 g KMnO₄ × (1 mol KMnO₄/158.03 g KMnO₄) = 0.443 mol KMnO₄

75.0 g HCl × (1 mol HCl/36.46 g HCl) = 2.06 mol HCl

Step 2: Determine the limiting reactant. The reactant that produces the least amount of product is the limiting reactant. To do this, we need to find the mole ratio between KMnO₄ and HCl.

From the balanced equation, 2 moles of KMnO₄ react with 16 moles of HCl.

So, the mole ratio of KMnO₄ to HCl is:

0.443 mol KMnO₄ × (16 mol HCl/2 mol KMnO₄) = 7.14 mol HCl

Since we have 2.06 mol of HCl and 7.14 mol of HCl are required to react with 0.443 mol of KMnO₄, we can see that HCl is the limiting reactant.

Step 3: Calculate the theoretical yield of Cl₂ using the mole ratio from the balanced equation.

From the balanced equation, 2 moles of KMnO₄ react to produce 5 moles of Cl₂.

So, the theoretical yield of Cl₂ is:

2.06 mol HCl × (5 mol Cl₂/16 mol HCl) × (70.9 g Cl₂/1 mol Cl2) = 36.2 g Cl₂

Therefore, the maximum yield of Cl₂ that can be produced from the given reactants is 36.2 grams.

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The balanced chemical equation for the reaction between nitrogen monoxide and oxygen gas is:

2NO(g) + O2(g) → 2NO2(g)

LR: NO

Excess: O2

Grams of target product produced: 30.7 g NO2

The balanced chemical equation for the reaction between nitrogen monoxide and oxygen gas is:

2NO(g) + O2(g) → 2NO2(g)

To determine the theoretical yield of nitrogen dioxide gas, we need to first identify the limiting reactant (LR) and the excess reactant. To do this, we can calculate the amount of product that would be produced from each reactant, assuming that they completely react:

From 22.0 g of NO: (22.0 g NO) / (30.01 g/mol NO) x (2 mol NO2 / 2 mol NO) x (46.01 g/mol NO2) = 30.7 g NO2

From 22.0 g of O2: (22.0 g O2) / (32.00 g/mol O2) x (2 mol NO2 / 1 mol O2) x (46.01 g/mol NO2) = 64.4 g NO2

Since NO is the limiting reactant, we can expect that 30.7 g of NO2 would be the theoretical yield of the reaction.

LR: NO

Excess: O2

Grams of target product produced: 30.7 g NO2

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Harley Davidson, Vespa, Benelli, Aprilla, and Bimota

Answer:

The large relative distances between particles in a gas means that there is considerable empty space between the particles.

The assumption that particles in a gas are relatively far apart explains gas compressibility.

Compressibility is a measure of how much the volume of matter decreases under pressure.

Energy is released by a gas when it is compressed

Explanation:

The kinetic molecular theory establishes that gases are composed of molecules. These molecules of gas are far apart from each other hence there is a considerable empty space between the gas molecules. As a result of these empty spaces between gas molecules, it is possible to compress a gas.

Compressibility is defined as a measure of how much the volume of matter decreases under pressure. When a gas is compressed, work is done on the gas and energy is evolved hence the gas heats up.

If a drain cleaner solution is a strong electrolyte then drain cleaner is highly ionized. The correct option is C).

A strong electrolyte is a substance that completely dissociates into ions in a solution. This means that when a strong electrolyte such as a drain cleaner is dissolved in water, it forms a high concentration of ions in the solution. The high ion concentration makes the solution highly conductive of electricity.

In the case of a drain cleaner, the high concentration of ions allows it to react more effectively with clogs and blockages in drains. Therefore, option A and B can be ruled out as they do not accurately describe the behavior of a strong electrolyte.

Option D is also incorrect as a strong electrolyte is highly ionized, not slightly ionized. Option E is incorrect as one of the options must be true. This leaves us with option C, which correctly describes the behavior of a strong electrolyte. Therefore, the correct option is C.

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Answer:

b, and d

Explanation:

because it makes the most sense I might be wrong

Moles of helium gas is 3.498 mol. and all the answer is given below.

Mole is a unit of measure used in chemistry to represent the amount of a substance. It is defined as the amount of a substance that contains as many elementary entities (atoms, molecules, ions, etc.) as there are atoms in 12 grams of carbon-12. This number is known as Avogadro’s number, and is equal to 6.022 x 10e23. The mole allows chemists to work with the mass of a substance in relation to the number of particles present.

a. Moles of helium gas = 14.0 g / 4.003 g/mol = 3.498 mol
b. Moles of nitrogen gas = 10.0 g / 28.014 g/mol = 0.357 mol
c. Partial pressure of helium gas = 3.498 mol * 0.0821 atm/mol = 0.288 atm
d. Partial pressure of nitrogen gas = 0.357 mol * 0.0821 atm/mol = 0.029 atm
e. Total pressure = 0.288 atm + 0.029 atm = 0.317 atm

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Answer:

1) faster

2) slower

Explanation:

Answer:

faster

Explanation:

Answer:

community

Explanation:

Answer:

The correct answer is population. I took the test and got it right.

Answer:

poluição atmosférica

Explanation:

O que eles estão tentando falar na pergunta é que a que termo nos referimos como a introdução de partículas estranhas na forma de suspensão etc. na atmosfera.

Este termo é conhecido como poluição do ar. É chamado assim porque, adulteramos a constituição original do ar, introduzindo esses novos componentes.

Esses componentes introduzidos muitas vezes têm um efeito adverso na composição da qualidade do ar.

Answer:

The answer is option A

Colorful feathers

Hope this helps you

Answer:

10. D

9. A

8. A or B

Explanation:

10. Calcium has 20 electrons, but the Calcium ion has 18 electrons.

9. The mass of electrons are negligible.

8. Electrons have a very small mass where some consider it to have no mass.

The refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

To calculate the kilowatt-hours (kWh) of electric energy used by the refrigerator in 30 days, we need to multiply the power rating by the total running time.

Given:

Power rating of the refrigerator = 500 W

Running time per day = 12 hours

Number of days = 30

First, we need to convert the power rating from watts to kilowatts:

Power rating = 500 W / 1000 = 0.5 kW

Next, we calculate the total energy used in kilowatt-hours (kWh) over the 30-day period:

Energy used = Power rating × Running time × Number of days

Energy used = 0.5 kW × 12 hours/day × 30 days

Energy used = 180 kWh

Therefore, the refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

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The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

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The boiling point of n-heptane is 98.42°C. And it has 7 Carbon atoms. Therefore, option (B) is correct. It has the highest boiling point among all the given compound.

When carbon chain gets longer, there are more and more electrons in a molecule. Which means that there are more stronger intermolecular forces between the molecules as alkali chain increases. As a result, it will take more energy to break these forces. Therefore, the melting or boiling points increase as we go from lower to higher straight alkali chain. Thus the chain with more number of carbon atom will have highest boiling point. n-heptane will be the answer.

The boiling point of n-butane is -1°C.

The boiling point of n-pentane is 36.1 °C.

The boiling point of n-hexane is 69°C.

The boiling point of n-heptane is 98.42°C.

So, the boiling point of n-heptane is highest among all the given compound. It has 7 Carbon atoms.

Hence, option (B) is correct.

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Answer:

19.6Watts

Explanation:

Given parameters:

Force applied  = 49N

Distance  = 2m

Time  = 5s

Unknown:

Power  = ?

Solution:

Power is the rate at which work is being done;

   Power  = \(\frac{Work done }{time}\)

Work done  = force x distance  = 49 x 2 = 98J

So;

      Power  = \(\frac{98}{5}\)  = 19.6Watts

Answer: left Mg 6, right Mg 1

Left P 4, right P 4

Balanced no

Explanation:

The molarity of the base used in the experiment, which was determined based on the recovered NaCl and the volumes of hydrochloric acid and sodium hydroxide, was approximately 1.15 M.

To determine the molarity of the base used in the experiment, we need to use the stoichiometry of the balanced chemical equation and the given data.

The balanced chemical equation for the reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH) is:

HCl + NaOH → NaCl + H2O

First, we need to find the number of moles of NaCl produced. We can do this by using the given mass of NaCl (2.22 g) and its molar mass (58.44 g/mol):

moles of NaCl = mass of NaCl / molar mass of NaCl

moles of NaCl = 2.22 g / 58.44 g/mol

moles of NaCl = 0.038 moles

Next, we can use the stoichiometry of the balanced equation to determine the number of moles of NaOH that reacted. Since the mole ratio between NaCl and NaOH is 1:1, the number of moles of NaOH is also 0.038 moles.

Now, we can calculate the molarity of the base (sodium hydroxide) using the given volume of sodium hydroxide solution (0.033 L):

Molarity of NaOH = moles of NaOH / volume of NaOH solution

Molarity of NaOH = 0.038 moles / 0.033 L

Molarity of NaOH ≈ 1.15 M

Therefore, the molarity of the base used in the experiment is approximately 1.15 M.

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the aldol condensation of menthone and anisaldehyde can be monitored by tlc and each starting material and product gave a distinct spot on the plate.

if the Rf value is low the concentration is higher if the Rf value is high its highly soluble and will move faster.

Aldol condensation is a term used to describe a chemical reaction in which an enolate ion combines with a carbonyl compound to produce either a hydroxy ketone or an aldehyde, which is then dehydrated to produce a conjugated enone.

After running a TLC, scientists frequently cannot simply see where compounds are situated since organic compounds typically appear colorless on the white background of a TLC plate. After elution, the chemicals must be momentarily transformed into something visible, or "visualized."

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