A chemist has 200 ml of a 10% sucrose solution. If she adds x milliliters of a 40% sucrose solution, what is the percent concentration of the final mixture? which expression represents the total mass, in grams, of sucrose in the final mixture? which expression represents the total volume, in milliliters, of the final mixture?.

Successful organisms must be able to do three things: obtain the energy they need to live, produce offspring, and maintain their Homeostasis.

Homeostasis refers to the maintenance of a constant internal environment within the body. This is achieved by regulating the levels of various substances in the blood, such as water, salts, and glucose.  The body achieves homeostasis through negative feedback loops. These loops work to maintain a stable internal environment by detecting changes and then correcting them.  

For example, the body regulates its temperature using a negative feedback loop. When the body temperature rises, sensors in the brain detect this change and send signals to the body to begin cooling itself down. This may happen by sweating or by increasing blood flow to the skin.  Once the body temperature has returned to normal, the negative feedback loop is complete and the body stops cooling itself down.  

The body also regulates its blood sugar levels using a negative feedback loop. When blood sugar levels rise, sensors in the pancreas detect this change and release insulin. Insulin then helps to transport sugar into cells, where it can be used for energy.  

Once blood sugar levels have returned to normal, the negative feedback loop is complete and the pancreas stops releasing insulin.  Negative feedback loops are vital for maintaining homeostasis and keeping the body functioning properly.

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Answer:

Henry Moseley

Explanation:

Dmitry Mendeleef and Lothar Meyer proposed a periodic table based on the atomic mass.

They stated a periodic law expressed as "chemical properties of elements are a periodic function of their atomic weights".

But, Henry Moseley in 1900s re-stated periodic law by changing the basis of the law from atomic weight to atomic number.

The present periodic law is stated as "the properties of elements are a periodic function of their atomic number".

Answer:

yellow

if not sorry that's though the best answer

Explanation:

Answer:

m= 6780mg = 6.78g = 6.8g

d= 6.8g/ml

V= m/d

V= 1ml

The concept of nonpolar aggregation to avoid interactions with water is more commonly known as the hydrophobic effect.

When proteins fold, the hydrophobic (nonpolar) regions of the protein tend to cluster together to minimize their contact with water molecules.

This clustering reduces the disruption of water molecules and increases the entropy of water, which is favorable from an energetic perspective. The hydrophobic effect plays a crucial role in protein folding as it drives the proper folding of the protein's three-dimensional structure.

The hydrophobic regions of the protein aggregate and bury themselves within the protein's interior, while the hydrophilic (polar) regions remain exposed to the surrounding water.

This arrangement maximizes the favorable interactions between water molecules and polar regions while minimizing the unfavorable interactions between water and nonpolar regions.

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Answer:

#1 is C, #2 is D, #3 is A

Explanation:

If The Excellence Cοrpοratiοn fοr Servicing Excellence sells the οffice furniture fοr $6,000, they wοuld recοgnize a lοss οf $1,000 οn the sale.

The recοgnitiοn οf the sale οf the οffice furniture by The Excellence Cοrpοratiοn fοr Servicing Excellence wοuld invοlve the fοllοwing:

The calculatiοn οf the gain οr lοss οn the sale:

Prοceeds frοm the sale: $6,000

Cοst οf the furniture: $10,000

Accumulated amοrtizatiοn: $5,000

Calculatiοn:

Gain/Lοss οn sale = Prοceeds frοm sale - (Cοst οf furniture - Accumulated amοrtizatiοn)

Gain/Lοss οn sale = $6,000 - ($10,000 - $5,000)

Gain/Lοss οn sale = $6,000 - $5,000

Gain/Lοss οn sale = $1,000

Determining the nature οf the gain οr lοss:

Since the prοceeds frοm the sale ($6,000) are less than the carrying value οf the asset ($10,000 - $5,000 = $5,000), a lοss will be recοgnized οn the sale.

Therefοre, if The Excellence Cοrpοratiοn fοr Servicing Excellence sells the οffice furniture fοr $6,000, they wοuld recοgnize a lοss οf $1,000 οn the sale.

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By combined gas law equation, the volume of the toy blimp at the new location will be approximately 9.18 L.

To determine the volume of the toy blimp at the new location, we can use the combined gas law equation, which relates the initial and final conditions of pressure, volume, and temperature:

(P₁ x V₁) / T₁ = (P₂ x V₂) / T₂

Where:

P₁ = initial pressure = 3.2 atm

V₁ = initial volume = 3.4 L

T₁ = initial temperature = 25 °C + 273.15 K (converted to Kelvin)

P₂ = final pressure = 3.5 atm

V₂ = final volume (unknown)

T₂ = final temperature = 44 °C + 273.15 K (converted to Kelvin)

Plugging in the given values:

(3.2 atm x 3.4 L) / (25 °C + 273.15 K) = (3.5 atm x V₂) / (44 °C + 273.15 K)

Now, solve for V₂:

V₂ = (3.2 atm x 3.4 L x (44 °C + 273.15 K)) / (3.5 atm x (25 °C + 273.15 K))

V₂ = 9.18 L

Therefore, the volume of the toy blimp at the new location will be approximately 9.18 L.

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The rate of consumption of Ca is 0.0833 g/s.

The rate of consumption of Ca can be determined by dividing the mass of Ca consumed (2.50 g) by the time taken for the reaction to occur (30.0 seconds). This gives us a rate of 0.0833 g/s, indicating that 0.0833 grams of Ca are consumed every second during the reaction at the given temperature.

In chemical reactions, the rate of consumption or production of a substance is typically expressed in terms of the change in concentration over time. In this case, since the mass of Ca consumed is given, we can directly calculate the rate of consumption.

It's important to note that the rate of consumption of Ca may vary with temperature and other reaction conditions. The given rate applies specifically to the given temperature and the specific reaction conditions mentioned in the problem.

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90 percent condensing furnaces are unique because they have a higher efficiency rate compared to traditional furnaces. They can extract more heat from the fuel source, resulting in a lower energy cost for the homeowner.

The unique feature of these furnaces is that they have a secondary heat exchanger that extracts additional heat from the combustion gases, which are then condensed and drained away. This process allows the furnace to utilize more of the energy produced, resulting in a higher efficiency rating. In addition to being more energy-efficient, 90 percent condensing furnaces are also better for the environment. They produce fewer greenhouse gas emissions, making them a more eco-friendly option. This is because the condensation process allows the furnace to capture and utilize more of the fuel's heat, reducing the amount of waste heat that is released into the atmosphere. Overall, 90 percent of condensing furnaces are unique in their ability to provide homeowners with an energy-efficient and environmentally-friendly heating option. By utilizing a secondary heat exchanger and condensing process, they are able to extract more heat from the fuel source, resulting in lower energy costs and reduced greenhouse gas emissions.

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A 3.4 × 10⁶ L swimming pool must have a mass of 1.0 × 10⁷ mg Cl₂ to maintain a concentration of 3.0 ppm.

"ppm" of "parts per million" is a unit of concentration equivalent to milligrams of solute per liters of solution.

A pool must maintain a chlorine concentration of 3.0 ppm (3.0 mg/L). The mass of chlorine in 3.4 × 10⁶ L is:

3.0 mg Cl₂/L × 3.4 × 10⁶ L = 1.0 × 10⁷ mg Cl₂

A 3.4 × 10⁶ L swimming pool must have a mass of 1.0 × 10⁷ mg Cl₂ to maintain a concentration of 3.0 ppm.

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In scientific investigations, the effect of fertilizer on plant growth can be studied by examining various variables. Two key variables in this context are the presence or absence of fertilizer (independent variable) and the size or growth of the plant (dependent variable).

When investigating the effect of fertilizer on plant growth, the independent variable is the presence or absence of fertilizer. This variable is controlled by having two groups of plants: one group receiving fertilizer (experimental group) and another group without fertilizer (control group). By comparing the growth of these two groups, we can determine the impact of fertilizer on plant size.

The dependent variable, on the other hand, is the size or growth of the plant. This variable is measured or observed as the outcome of interest. In this case, it would be the height, weight, or overall size of the plants.

By systematically changing the independent variable (presence or absence of fertilizer), we can observe how it affects the dependent variable (plant growth). The experimental group receiving fertilizer is expected to show greater plant growth compared to the control group without fertilizer. This allows us to draw conclusions about the effect of fertilizer on plant growth.

However, it is important to note that the specific outcome may vary depending on other factors such as plant species, soil conditions, and environmental factors. Conducting a controlled experiment while considering these factors helps in obtaining more reliable results.

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193 grams of NaCl are needed to make 1.50 L of a 2.20-M NaCl solution.

Calculation of the mass of NaCl required:

The only thing we need to know is that a solution's molarity informs us of the exact amount of moles of solute that are contained in 1 L of a solution.

In this situation, a NaCl (sodium chloride) solution with a 2.20-M concentration will have 2.20 moles of the solute (sodium chloride) in every 1 L of the solution.

The solution's molarity of 2.20 M requires that every 1 L of this solution include 2.20 moles of sodium chloride, which implies that every 1.50 L of this solution needs to contain

\(1.5 L solution .\frac{2.20 moles NaCl}{1L solution} = 3.30 moles NaCl\)

Utilize the compound's molar mass to translate the amount of NaCl (sodium chloride) in moles to grams.

\(3.30 moles NaCl . \frac{58.4 gm}{1 mole NaCl} = 192.7 gm\) ≈ 193 gm

Therefore it is concluded that the final answer is 193 gm.

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Answer:

58.8C of heat

Explanation:

76.9C is the current heat temperature, to decrease it to 18.1C we have to subtract the both and later find our answer

Answer:

Sorry I really don't know but can you help with one of my question I posted please thanks.

To produce 1000 kg of fishmeal (M = 1000 kg), you would need 3000 kg of pasta. To determine the amount of pasta required to produce 1000 kg of fishmeal, we need to consider the mass balance of the process. Let's break down the steps involved:

A. Extraction of fish oil:

The pasta obtained from the extraction stage contains 20% flour and 80% water. To calculate the amount of pasta, we need to determine the mass of flour and water in the pasta. Let's assume the total mass of the pasta is P kg.

Mass of flour = 20% of P = 0.2P kg

Mass of water = 80% of P = 0.8P kg

b. Drying of pasta:

During the drying stage, the pasta is dried in a rotary drum, resulting in fishmeal with 40% humidity. This means that the final fishmeal will contain 60% dry matter.

Let's assume the mass of the dried fishmeal is M kg.

Mass of dry matter = 60% of M = 0.6M kg

Since the dry matter in the fishmeal comes from the flour in the pasta, we can equate the mass of dry matter to the mass of flour:

0.6M kg = 0.2P kg

To produce 1000 kg of fishmeal, we want to find the corresponding value of P:

0.6M = 0.2P

P = (0.6M) / 0.2

P = 3M

Therefore, to produce 1000 kg of fishmeal (M = 1000 kg), you would need 3000 kg of pasta.

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Answer:

Spongy mesophyll tissue is packed loosely for efficient gas exchange. The spongy mesophyll cells are covered by a thin layer of water. ... When the plant is photosynthesising during the day, these features allow carbon dioxide to diffuse into the spongy mesophyll cells, and oxygen to diffuse out of them.

Answer:

6.005109 x 10⁸

Explanation:

Given expression:

      (0.003999 x 10⁸) + (6.00111 x 10⁸)

Now, to solve for this sum,

   take the coefficient and sum:

     =  (0.003999 + 6.00111) x 10⁸

     = 6.005109 x 10⁸

In this kind of problem, just make sure the exponent parts are the same then add the coefficient together.

Answer: It has to be stratosphere because This region of the atmosphere is called the stratosphere. It is present in stratosphere According to NASA earth have 6 atmospheric layers..the layer just above the earth is troposphere and above this layer is the stratosphere.

Explanation:

An aqueous solution of methyl alcohol is made by transferring 22.7 ml of liquid methyl alcohol to a 300  ml volumetric flask, and then adding enough water to fill the flask to the mark.  the volume/volume percentage of methyl alcohol in the solution is 7.56 %

The volume of methyl alcohol = 22.7 mL

the volume of the solution = methyl alcohol + water = 300 mL

the volume / volume percentage = (volume of methyl alcohol / total volume

 of methyl alcohol                                                               of  solution)× 100%

                                                        = (22.7 / 300) × 100

                                                        = 7.56 %  

Thus, An aqueous solution of methyl alcohol is made by transferring 22.7 ml of liquid methyl alcohol to a 300 . ml volumetric flask, and then adding enough water to fill the flask to the mark.  the volume/volume percentage of methyl alcohol in the solution is 7.56 %

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Answer:

Explanation:

A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms. These electrons are simultaneously attracted by the two atomic nuclei. A covalent bond forms when the difference between the electronegativities of two atoms is too small for an electron transfer to occur to form ions.

Answer:

EtOH stands for ethyl alcohol, which is the type of alcohol found in alcoholic beverages such as beer, wine, and spirits. It is a central nervous system depressant that can cause a range of effects, from mild relaxation to severe impairment of cognitive and motor functions. EtOH is often used in the medical and research fields as a short notation for Ethanol.

EtOH is the chemical label or acronym for ethyl alcohol (ethanol). EtOH refers to the kind of alcohol that can be found in alcoholic beverages like wine, beer, and spirits.

It is a depressant of the central nervous system that can have a variety of effects, ranging from mild relaxation to severe cognitive and motor impairment. In the medical and research industries, EtOH is frequently used as a short notation for ethanol.

It is used in the production of other chemicals, as a solvent, and in alcoholic beverages. Ethanol is a colorless, somewhat toxic substance. Solutions of ethanol and water that contain more than 50% ethanol are extremely flammable. The most well-known use of ethanol is as alcohol in alcoholic beverages.

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The energy of an electron in a hydrogen atom with an orbit of n=3 is -5.45×10⁻¹⁹ J.

In the Bohr model of the hydrogen atom, electrons are assumed to orbit the nucleus in specific energy levels or shells. These energy levels are represented by the principal quantum number, denoted as "n." Each energy level has a specific energy associated with it, and the energy of an electron in a hydrogen atom can be calculated using the formula:

E = -(k * Z²) / n²

where E is the energy, k is the constant (2.18×10⁻¹⁸ J), Z is the atomic number (1 for hydrogen), and n is the principal quantum number.

In this case, the given value of n is 3. Plugging this value into the formula, we have:

E = -(2.18×10⁻¹⁸ J * 1²) / 3²

= -(2.18×10⁻¹⁸ J) / 9

= -2.42×10⁻¹⁹ J

So, the energy of an electron in a hydrogen atom with an orbit of n=3 is -2.42×10⁻¹⁹ J. The negative sign indicates that the electron is in a bound state, as it has less energy than a free electron.

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The main answer to your question is that the ion-product expression for lead(ii) iodide is as follows:
Ksp = [Pb2+][I-]2

To give an explanation, the ion-product expression is a mathematical representation of the solubility product constant (Ksp) for a given compound.

For lead(ii) iodide, the Ksp represents the equilibrium constant for the dissociation of lead(ii) iodide into its component ions, lead(II) cations (Pb2+) and iodide anions (I-), in a saturated solution.
The Ksp expression shows that the concentration of the ions present in solution at equilibrium are directly proportional to the solubility of the compound, and as the solubility of the compound increases, so does the concentration of the ions in solution.

In summary, the ion-product expression for lead(ii) iodide is a representation of the solubility product constant and shows the equilibrium constant for the dissociation of the compound into its component ions.

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The theoretical weight of sodium borohydride is  1900 g

Now we know that the theoretical weight is the weight that is obtained from the stoichiometry of the reaction. Now we are given that the number of moles of the benzil is 50 moles and the reaction is 1:1.

1 mole of benzil reacts with 1 mole of sodium borohydride

50 moles of benzil reacts with 50 moles of sodium borohydride

Thus;

Mass of sodium borohydride = 50 moles * 38 g/mol

= 1900 g of sodium borohydride

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Answer:

C

Explanation:

Calcium is an element with a total of 20 electrons.

 It has 4 shells with a configuration of:

          2, 8, 8, 2

Option C is the most similar to calcium but the number of shells is not complete.

It still requires two more shells with 8 and two electrons respectively.

Answer:

The answer would be sugar.

Explanation:

Hope this helps :)

If only an element’s atomic number and weight are provided, the number of protons, electrons and neutrons can also be determined.

The atomic number of an element is the number of protons in an atom while the mass number is the sum of the atomic number and the number of neutrons.

An atom has three subatomic particles namely;

The number of protons of an element is the atomic number of that element.

This means that if only an element’s atomic number and weight are provided, the number of protons, electrons and neutrons can also be determined.

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Answer:

(Question) If only an element’s atomic number and weight are provided, what other atomic information can be determined for a neutral atom?

(Answer) the number of protons, electrons and neutrons

(Question) What quality differentiates hydrogen (H) from the other elements in group 1, the alkali metals?

(Answer) It is a non-metal.

(Question) On which atomic property proposed by Henry Moseley is the current periodic table of the elements based?

(Answer) atomic number

(Question) You plan to pass alpha particles through a field that contains a consistent type of particle. Which configuration will result in the largest deflection of alpha particles?

(Answer) low-energy alpha particles passing through a field of high mass-number-particles

(Question) Which statement about metals and nonmetals is correct?

(Answer) Metals can be hammered into thin sheets, and nonmetals are brittle.

(Question) Based on properties of elements in the periodic table, which element is the best conductor of thermal energy?

(Answer) vanadium (V)

(Question) Which element has four valence electrons?

(Answer) silicon (Si)

(Question) Which statement best explains why hydrogen’s atomic number is equal to its mass?

(Answer) Hydrogen does not have any neutrons.

(Question) Which statement correctly compares the valence electrons for atoms of francium (Fr) and barium (Ba)?

(Answer) Francium has fewer valence electrons, but they are in a higher energy level.

(Question) Why are the noble gases the least reactive elements?

(Answer) They have a full valence electron shell.

(Question) Group 2 elements have two valence electrons. Which kind of bond will they most likely form, and why?

(Answer) An ionic bond is likely because they will want to give away two valence electrons in order to become stable.

(Question) How many electrons can carbon accept from other atoms while bonding?

(Answer) four

(Question) An element has six valence electrons. Which ionic charge will its ion carry?

(Answer) 2-

Questions 14, 15, & 16 are written responses good luck.

Explanation:

Answer:

17.46× 10²³ molecules

Explanation:

Given data:

Mass of acetic acid = 172.90 g

Number of molecules = ?

Solution:

First of all we will calculate the number of moles of acetic acid :

Number of moles = mass / molar mass

Number of moles = 172.90 g/ 60.1 g/ol

Number of moles = 2.9 mol

Now the given problem will solve by using Avogadro number.

The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ molecules

2.9 mol × 6.022 × 10²³ molecules  / 1 mol

17.46× 10²³ molecules

Avogadro number:

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.