What is the volume, in mL , of 6.56 g of acetone?

The total activity of the sample two hours after removal from the reactor core is 0.7552 MBq. The sample can be given to the researcher 11 hours and 42 minutes after removal from the reactor core.

Question 1The total activity of the NaCl sample two hours after removal from the reactor core can be calculated using the equation of radioactive decay.

Activity = Initial activity × (1/2)t/h

where

Activity = activity at time t

Initial activity = activity at time zero

h = half-life

t = time

For Na-24, t = 2 hours, h = 15 hours, and initial activity = 1 MBq.

Activity of Na-24 after 2 hours= 1 × (1/2)2/15= 0.7552 MBq

Therefore, the total activity of the sample two hours after removal from the reactor core is 0.7552 MBq.

Question 2The activity of the Cl-38 after time t can be calculated using the equation below:

Activity of Cl-38 = Initial activity of Cl-38 × (1/2)t/h

where

Activity = activity at time tInitial activity = activity at time zeroh = half-life

t = time

For Na-24, t = 2 hours, h = 15 hours, and initial activity = 1 MBq.

For Cl-38, t = ?, h = 37.2 minutes (0.62 hours), and initial activity = 2.7 MBq.

The researcher wants the Cl-38 activity to be 1% of the Na-24 activity.

Activity of Cl-38 = 0.01 × activity of Na-24= 0.01 × 1= 0.01 MBq

Activity of Cl-38 = Initial activity of Cl-38 × (1/2)t/h0.01 = 2.7 × (1/2)t/0.62(1/2)t/0.62 = 0.01/2.7(1/2)t/0.62 = 0.0037037(1/2)t = log 0.0037037/ log 0.50.5t = 5.8546t = 11.7092 hours (to the nearest minute)= 11 hours 42 minutes

Therefore, the sample can be given to the researcher 11 hours and 42 minutes after removal from the reactor core.

To know more about reactor core, visit:

https://brainly.com/question/1188553

#SPJ11

Answer:

C & D

Explanation:

The attractive force between particles of a liquid determines the temperature at which the liquid changes state: the stronger the attraction, the larger amount of energy is required to break the bonds to boil; i.e. at a higher temperature. So C. Strong attractions mean the liquid boils at a higher temperature is correct.

By the same reasoning, the stronger attractive force between particles also means that it takes more energy to change state from solid to liquid; i.e. a higher melting point.  So D. Strong attractions mean the liquid melts at a higher temperature is also correct.

Answer:

45 °C.

Explanation:

From the question given above, the following data were obtained:

Heat (Q) = 1125 J

Mass (M) = 250 g

Final temperature (T₂) = 55 °C

Specific heat capacity (C) = 0.45 J/gºC

Initial temperature (T₁) =?

The initial temperature of the iron can be obtained as illustrated below:

Q = MC(T₂ – T₁)

1125 = 250 × 0.45 (55 – T₁)

1125 = 112.5 (55 – T₁)

Divide both side by 112.5

1125/112.5 = 55 – T₁

10 = 55 – T₁

Collect like terms

10 – 55 = –T₁

–45 = –T₁

Multiply through by –1

45 = T₁

T₁ = 45 °C

Therefore, the initial temperature of the iron is 45 °C

To make 1 liter of a 10% NaCl solution from a solid stock, you will require the following materials and containers.MaterialsSolid NaClDistilled water1-Liter volumetric flask250-mL volumetric flask 2-beakersProcedureTo prepare 1 liter of a 10% NaCl solution, the following procedure should be followed:Measure out 100g of NaCl using a balance.

Measure the weight of an empty 250-mL volumetric flask.Add the NaCl to a 250-mL beaker and add a small amount of distilled water to it to dissolve the NaCl.Carefully pour the dissolved NaCl solution into the 250-mL volumetric flask. Add distilled water to the mark on the flask to make up the volume. Stopper the flask and invert it several times to mix the solution.Measure the weight of the 1-Liter volumetric flask.Add the 250-mL volumetric flask solution to a 1-Liter volumetric flask.Add distilled water to the mark on the flask to make up the volume.

Stopper the flask and invert it several times to mix the solution.The final volume of the solution will be 1 liter of a 10% NaCl solution.PrecautionsEnsure the NaCl has completely dissolved before adding more water to avoid making a less concentrated solution.Measure the weight of the volumetric flask before and after adding the solution to calculate the volume of solution that was added.Use distilled water to prepare the solution.

To know more about volumetric flask  visit:-

https://brainly.com/question/28997155

#SPJ11

Answer:

A big load of icecream/ loaded cake.

Explanation:

Al2O3, also known as aluminum oxide, is a chemical compound composed of aluminum and oxygen. It is a white crystalline substance that is commonly used in a variety of industrial and commercial applications, including as a abrasive material, a refractory material, and as a high-temperature insulator.

In chemistry, the term "element" refers to a pure substance made up of only one type of atom. A "compound" is a substance made up of two or more elements combined in a fixed ratio. Al2O3 is a compound because it is made up of two different elements, aluminum and oxygen, that are chemically bonded together.

The chemical formula for aluminum oxide, Al2O3, represents the ratio of atoms in the compound. The "2" in the formula represents the number of aluminum atoms, while the "3" represents the number of oxygen atoms. This means that for every two aluminum atoms, there are three oxygen atoms in the compound.

In conclusion, Al2O3 is a chemical compound and not an element because it is made up of two different elements combined in a fixed ratio.

Here you can learn more about aluminum oxide

https://brainly.com/question/19761029#

#SPJ11

Option A). The salts that will be substantially more soluble in an acidic solution than in pure water are PbCl₂, Al(OH)₃, and FeS.

1. Look for salts containing anions that can react with H+ ions from acidic solutions, making them more soluble. These anions include Cl-, OH-, S₂-, and PO₄₃-.
2. From the given choices, identify the salts containing these anions:
  - PbCl₂ (contains Cl-)
  - Al(OH)₃ (contains OH-)
  - Ba₃(PO₄)₂ (contains PO₄₃-)
  - FeS (contains S₂-)
3. Consider the cations' ability to form soluble complexes with the anions. Al₃+ and Fe₂+ can form soluble complexes with OH- and S₂-, respectively, while Pb₂+ can form soluble complexes with Cl-.
4. Based on this analysis, the salts that will be more soluble in acidic solutions are:
  - PbCl₂
  - Al(OH)₃
  - FeS

For more such questions on salts

brainly.com/question/13818836

#SPJ11

The interactions that hold hair strands together and are pH-sensitive are (iii) a disulfide linkage. The correct answer is "iii only".

Disulfide linkages are formed between sulfur atoms in the amino acid cysteine, which is present in the protein structure of hair. These linkages are responsible for the structural stability and strength of hair. When the pH of the hair is altered, such as through the use of chemical treatments or hair products, the disulfide linkages can be disrupted. This can lead to changes in the shape and texture of the hair. Therefore, the presence and integrity of disulfide linkages in hair are pH-sensitive. On the other hand, salt bridges and hydrogen bonds, mentioned in options (i) and (ii) respectively, are not directly pH-sensitive. Salt bridges are ionic interactions that can be influenced by pH indirectly through changes in ionization states of charged amino acids. Hydrogen bonds, while important for the structure of hair, are not directly affected by pH changes.

Learn more about Salt bridges here: brainly.com/question/2861410

#SPJ11

Using the data you acquired from the tube in the dish containing 0.05 M NaOH, predict it would take for glucose absorbed in the gut to diffuse to muscles in your foot is I: 8,000 minutes (about 133 hours).

Diffusion is a process resulting from the movement of molecules where the flow moves from an area of high concentration to an area of low concentration.

In this definition, the difference in concentration of two solutions is also known as a concentration gradient. Even though there is no difference in concentration, movement of molecules can still occur to reach equilibrium.

The process of diffusion also occurs in the human body. diffusion is the process of moving particles of a substance from a high concentration solution to a low concentration solution to achieve equilibrium.

An example of diffusion in the human body is when we inhale, the alveoli expand and oxygen enters the lungs. Then, when you exhale, the alveoli collapse and carbon dioxide leaves the body. Well, this process occurs because molecules move from high to low concentrations.

Learn more about diffusion at https://brainly.com/question/30029692.

#SPJ4

The substance that contains elements chemically combined in a fixed proportion is called a compound.

In a compound, the elements are bonded together through chemical bonds such as ionic bonds, covalent bonds, or metallic bonds. The atoms in a compound are arranged in a specific and predictable manner, forming a unique chemical formula that represents the elemental composition of the compound.

For example, water (H2O) is a compound composed of two hydrogen atoms (H) and one oxygen atom (O). The ratio of hydrogen to oxygen in water is always 2:1. Regardless of the source or method of production, the ratio of hydrogen to oxygen atoms in water remains constant.

Similarly, sodium chloride (NaCl) is a compound made up of one sodium atom (Na) and one chlorine atom (Cl). The ratio of sodium to chlorine in sodium chloride is always 1:1.

The fixed proportion of elements in a compound is a fundamental characteristic of chemical compounds and is a result of the specific arrangement and bonding of the atoms within the compound. This fixed proportion allows compounds to have unique properties and behaviors that differ from those of the individual elements composing them.

For more such questions on compound visit:

https://brainly.com/question/29108029

#SPJ11

Answer:

Neutrons and protons

Explanation:

There are three fundamental subatomic particles, these are;neutrons protons and electrons.

Ernest Rutherford successfully showed that every atom does possess a central core that contain positively charged particles (protons) called the nucleus. Chadwick later discovered the existence of neutrons.

Both protons and neutrons are found in the nucleus. Z represents the nucleus of the boron atom and houses the neutrons and protons of the boron atom.

Answer:

A not

B yes

C yes

D yes

Explanation:

A 2C 6H but 10O and 7O so no

B 3C 6O 2Fe on each side  so yes

C 4H 1S 6O 2Na so yes

D 2Ag 2Cl 1Ca 2N 6O so yes

Nowadays, it is very important to reduce one's carbon "footprint" (how much carbon we produce in our daily lifestyles). By limiting the use of fossil fuels and instead turning to renewable sources of energy, we can significantly reduce our carbon emissions and mitigate the impacts of climate change.

One way to reduce our carbon footprint is by transitioning to renewable energy sources such as solar, wind, and hydropower. These sources of energy produce minimal greenhouse gas emissions compared to fossil fuels like coal, oil, and natural gas. Installing solar panels on rooftops, utilizing wind turbines, and supporting hydroelectric power can help generate clean and sustainable energy.

Another important aspect is adopting energy-efficient practices and technologies. This includes using energy-efficient appliances, LED lighting, and improving insulation in buildings to reduce energy consumption. Conserving energy in transportation by opting for public transportation, carpooling, biking, or walking can also make a significant difference.

Additionally, reducing waste and promoting recycling and composting can help minimize greenhouse gas emissions. Waste decomposition in landfills produces methane, a potent greenhouse gas. By reducing, reusing, and recycling materials, we can lower our carbon emissions and conserve resources.

Furthermore, making conscious choices in our daily lives can contribute to reducing our carbon footprint. This includes minimizing water usage, eating a plant-based diet or reducing meat consumption, and supporting sustainable and local products.

To know more about sustainable energy

https://brainly.com/question/21498934

#SPJ11

Answer:

D

Explanation:

The reduction potential of Cu²⁺ is 0.34 volts and the reduction potential of Ag⁺ is 0.8 volts

The reduction potentials of Ag⁺ and Cu²⁺ relative to the silver and copper electrodes, respectively, can be found by using a vertical ruler to shift the zero point of the reference hydrogen half-reaction.

Relative to the silver electrode, the reduction potential of Ag⁺  is 0.8 volts and

The reduction potential of Cu²⁺ is 0.0 volts.

Relative to the copper electrode, the reduction potential of Ag⁺  is 0.0 volts and

The reduction potential of Cu²⁺ is 0.34 volts.

The reduction potentials of the other half-reactions (Fe²⁺, Zn²⁺) cannot be measured relative to the silver and copper electrodes, as they are not included in the vertical ruler.

Learn more about Standard reduction potentials here:

https://brainly.com/question/2731940

#SPJ11

In a 1 molar solution of N2H4(aq), the species present in the solution are N2H4 and H2O.

To arrange them by their relative molar amounts in solution, we need to consider their stoichiometry.

The balanced chemical equation for the dissolution of N2H4 in water is:

N2H4(aq) + H2O(l) -> NH3(aq) + NH4OH(aq)

From the equation, we can see that 1 mole of N2H4 produces 1 mole of NH3 and 1 mole of NH4OH.

Therefore, the molar amounts of N2H4, NH3, and NH4OH in the solution are equal.

So, in a 1 molar solution of N2H4(aq), the relative molar amounts of species present in solution are:

- N2H4: greatest amount
- NH3: least amount
- NH4OH: least amount

Please note that the given question does not mention any other species, so we consider only N2H4, NH3, and NH4OH in our answer.

Learn more about stoichiometry from the given link

https://brainly.com/question/14935523

#SPJ11

Answer:

Moving the balls closer together. The distance decreases and force increases.

The half-life of the reaction at 36°C is 19.2 seconds.

We can use the following equation to determine the  half-life of the reaction at 36°C;

\(t_{1/2}\) = ln(2) / k

where \(t_{1/2}\) is the half-life of the reaction and k is the reaction rate constant at the given temperature.

First, we need to find the reaction rate constant at 36°C. We can use the two rate constants given for 30°C and 42°C and the Arrhenius equation;

ln(k₂/k₁) = (-Ea/R) × (1/T₂ - 1/T₁)

where k₁ and k₂ are the rate constants at temperatures T₁ and T₂, Ea will be the activation energy, R is gas constant, and T is temperature in Kelvin.

We can choose 30°C (303 K) as T₁ and 42°C (315 K) as T₂, and solve for ln(k₂/k₁) to get;

ln(k₂/k₁) = (-Ea/R) × (1/T₂ - 1/T₁)

ln(0.0608/0.0202) = (-Ea/8.314 J/(mol×K)) × (1/315 K - 1/303 K)

Ea ≈ 52.7 kJ/mol

Next, we can use the Arrhenius equation to find the rate constant at 36°C (309 K);

k = A × exp(-Ea/RT)

k = 0.0202 s⁻¹ × exp(-52.7 kJ/mol / (8.314 J/(mol×K) × 309 K))

k ≈ 0.036 s⁻¹

Finally, we can use the half-life equation with this rate constant to find the half-life at 36°C;

\(t_{1/2}\)= ln(2) / k

\(t_{1/2}\) = ln(2) / 0.036 s⁻¹

\(t_{1/2}\) ≈ 19.2 s

To know more about half-life here

https://brainly.com/question/24710827

#SPJ4

Answer:

A, B, D, E

Explanation:

did it on edg

Answer:

A. Making laundry detergent

B. Making dish detergent

D. De-hairing hides

E. Making paper

Explanation:

Explanation:

u can put them in order crossed are spectator ions. hope this helps:)

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.

Learn more about mixture at: https://brainly.com/question/12160179

#SPJ1

The dosage of 26mg can be prepared using approximately 1.625 mL of the 40mg in 2.5 mL solution.

The dosage of 22mg can be prepared using approximately 1.222 mL of the 36mg per 2 mL strength solution.

To calculate the dosage using ratio and proportion, we can set up a proportion based on the strength of the solution.

40mg in 2.5 mL solution will be used to prepare a 26mg dosage.

Let X represent the mL of the solution needed to prepare the 26mg dosage.

We can set up the proportion as follows:

40mg/2.5mL = 26mg/X mL

Cross-multiplying and solving for X, we have:

40mg * X mL = 2.5mL * 26mg

40X = 65

X = 65/40

X ≈ 1.625 mL

For the second question:

36mg per 2 mL strength solution is used to prepare 22mg.

Let Y represent the mL of the solution needed to prepare the 22mg dosage.

We can set up the proportion as follows:

36mg/2mL = 22mg/Y mL

Cross-multiplying and solving for Y, we have:

36mg * Y mL = 2mL * 22mg

36Y = 44

Y = 44/36

Y ≈ 1.222 mL

To know more about solution

https://brainly.com/question/1616939

#SPJ11

Answer:

a new model of the atom that describe electrons as being in a cloud

Explanation:

The complete question is as follows: Barium chloride (BaCl2) emits a green color when flame tested. What can be said about the wavelength of light it emits? Select all that apply.

A) The thermal energy is transferred to the outer electrons of the barium ions.

B) The electrons gain enough energy to excite them to a higher energy level.

C) The electrons drop back down to their ground state, gaining energy.

D) The electrons release energy emitting a wavelength of 500-560 nm, corresponding to a green light, when going back to their ground state.

Answer: The following can be said about the wavelength of light that Barium chloride emits:

Explanation:

As barium chloride is emitting green color when flame tested. This means that thermal energy is being transferred to the outer electrons of barium ions.

A visible light is emitted by a substance when its electrons move from a region of higher energy level to lower energy level. This is because energy is given off by the electrons when they move in a lower region.

This is only possible when the electrons gain enough energy to excite them to a higher energy level.

Also, the electrons release energy emitting a wavelength of 500-560 nm, corresponding to a green light, when going back to their ground state.

Thus, we can conclude that following can be said about the wavelength of light that Barium chloride emits:

The angular momentum of an electron is the product of its mass, velocity and radius of orbit mvr. This is equivalent to nh/2π.

Angular momentum is  the rotational analogue of linear momentum. The momentum of a moving object is the ability to bring the force acting on it make the maximum displacement.

Momentum is the product of mass and velocity. According to Bohr theory of atom, the angular momentum , that is the momentum associated with an object moving through a circular path is the product of radius of the path and linear momentum.

Linear momentum = mv

angular momentum  = mv r.

Hence, the angular momentum of an electron is mvr.

Find more on angular momentum:

https://brainly.com/question/29897173

#SPJ1

Answer:

Perpendicular to its orbit

Explanation:

The angular momentum of an object in circular motion, whether an electron or a macroscopic object, will be perpendicular to the plane of circular motion.

A. iron

B. iodine

C. Helium

D. calcium

E. lead

F. hydrogen

check your periodic table to see if they are correct

atomic number, proton number and electron are the same

to find neutron = mass number - atomic number

Cyclopentene is industrially produced in large quantities. It is used as a monomer for the synthesis of plastics, in addition to other chemical syntheses.

Reaction 1 - Preparation of keto-aldehyde

Reaction 2 - Preparation of cyclopentene carbaldehyde

Reaction 3 -Preparation of α,β-epoxy-carbaldehyde cyclopentane

Reaction 4 - Preparation of cyclopentene alcohol

Reaction 5 -Preparation of α,β-epoxy-cyclopentane alcohol

Reaction 6 -Preparation of α,β-epoxy-carbaldehyde cyclopentane

With this information we can conclude that cyclopentene is used as a monomer for the synthesis of plastics.

Learn more about synthesis of plastics in brainly.com/question/13833034

The mass (in grams) of KHP required to react completely with the NaOH in 35 ml of 0.10 M NaOH is:0.71 g.

Firstly Calculate the number of moles of KPH required and convert to grams.

First, we need to determine how many moles of NaOH we have. We have 35 mL of a 0.10 M NaOH solution.

M = moles/liter, so we have a 0.10 mole/liter solution in 35 mL.

We get 35 mL x 1 L/1000 mL = 0.035 L when we convert mL to liters.

To calculate the number of moles, multiply the number of liters by the moles/liter: 0.035 L x 0.10 moles/L = 0.0035 moles NaOH

We know we need 0.0035 moles KPH because our reaction equation above says we need 1 mole of KPH for every mole of NaOH.

We must now convert moles of KPH to grams of KPH. According to the problem, the molecular mass of KPH is 204 g/mol.

To calculate the number of grams, multiply the number of moles by the molecular mass:

0.0035 moles KPH * 204g/mol = 0.71 g KPH

To learn more about mass and calculation, here

https://brainly.com/question/15743584

#SPJ4