a government agency recommends that the amount of arsenic in drinking water should not be above 0.01 ppm. at this concentration, how many grams of arsenic would you expect to find dissolved in 1000 ml of pure water?

Considering the definition of mass volume percentage, a mass of NaCl of 45 grams is required to prepare 60ml of a 75% solution.

A mass volume percentage is a ratio of the mass of a solute to the volume of the solution, expressed as a percentage. The mass/volume percentage is calculated as the mass of solute divided by the volume of solution:

mass volume percentage= (mass of solute÷ volume of solution)×100%

In this case, you know:

Replacing in the definition of mass volume percentage:

75% grams/mL= (mass of solute÷ 60 mL)×100%

Solving:

75% grams/mL÷100%= mass of solute÷ 60 mL

0.75 grams/mL= mass of solute÷ 60 mL

0.75 grams/mL×60 mL= mass of solute

45 grams= mass of solute

Finally, a mass of NaCl of 45 grams is required.

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Answer:

33

Explanation:

The atomic number of an element configuration 2,8, 8,2,13​ is 33.

The electron configuration is defined as the arrangement of electrons in atomic or molecular orbitals of an atom. The sum of electrons in different orbitals shown in the electron configuration represents the atomic number of the atom.

So, atomic number of the element configuration 2,8, 8,2,13​ is 33.

Answer: You have the values of P1, V1, T1, T2, and V2.  Plug in the numbers and get P2.

Explanation:

Work with the relation

P1V1 / T1 = P2V2 / T2 ⇒

P2 = (P1V1 / T1) (T2 / V2)

Aluminum displaces the iron in a redox reaction as it has its protective layer of aluminum oxide because it is more reactive than iron.

A redox reaction is a reaction in which oxidation and reduction reaction occur simultaneously and to the same extent.

An oxidation reaction occurs when atoms of elements lose electrons resulting in an increase in the oxidation number of the element.

A\ occurs when atoms of elements gain electrons resulting in a decrease in the oxidation number of the element.

The redox reaction of the displacement of iron by aluminum to form a protective layer of aluminum oxide is given below:

Fe₂O₃ (aq) +  2 Al (s) ----> 2 Fe (s) + Al₂O₃

In the given redox reaction above, aluminum metal displaces iron from its oxide to form aluminum oxide. Iron (iii) ion is reduced to metallic iron while metallic aluminum is oxidized to aluminum (iii) ion.

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To minimize the cost of the final blend, you should use 2 kg of PEST and 1 kg of BUG. This would provide 120 g of carbaryl and 80 g of Malathion, which meets the required amounts, while keeping the cost at $7.50 ($3.00 for 2 kg of PEST and $2.50 for 1 kg of BUG).

To ensure the effectiveness of the rose dust, it is important to understand the properties of both pesticides and their effects on the environment. Carbaryl is a contact insecticide, meaning it works by coming into contact with the insect and killing it.

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Answer:

Ionic

Explanation:

A transfer of electrons occurs when fluorine and calcium react to form an ionic compound. This is because calcium is in group two and so forms ions with a two positive charge. Fluorine is in group seven so forms ions with a negative charge.

Answer:

The colder an object it, the slower the atoms are. This is the rule that affects how cold something can get. There is a limit of how cold something can get though. This is called absolute zero. And, actually, we've gotten very close to it. Scientists in Finland have cooled rhodium atoms to a 10th of a billionth of a degree above absolute zero.

Answer:

that isn't a full equation but I will assume this is = to 0

that makes x 30.95

Explanation:

Answer:

B lunar eclipse

Explanation:

Answer:

Lunar Eclipse

Explanation:

I have a science book that shows.

2NaNO3(aq) + BaSO4 = Ba(NO3)2(aq) + Na2SO4(aq) (s)

Procedures involved:

The cations or anions may transfer positions in this twofold replacement/displacement reaction, which results in AB + CD AD + CB. In such a reaction, water, an insoluble gas, or an insoluble solid must be one of the byproducts (precipitate). The reaction in question has the following molecular equation:

2NaNO3(aq) + BaSO4 = Ba(NO3)2(aq) + Na2SO4(aq) (s)

Double displacement:

When two atoms or groups of atoms swap positions, a double displacement reaction occurs, creating new compounds. Typically, aqueous solutions are where it happens.

Na2SO4 + BaCl2 BaSO4 + 2NaCl is an example of a double displacement reaction.

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Let the weak acid HA be acetic acid which is the analyte. Titrant is NaOH a strong base.

1. No NaOH is added yet. So pH is low containing predominantly H3O+ weakly dissociated from the weak acid.

CH3COOH + H2O ⇌ CH3COO- + H3O+

2. As NaOH is added dropwise, H3O+ gets consumed by the OH- furnished. But still the analyte pH is acidic.

3.At the equivalence point moles of NaOH added = moles of CH3COOH in the analyte.

The ions are completely neutralised. The solution contains CH3COONa + H2O

CH3COOH + NaOH ⇌ CH3COONa + H2O

4.CH3COONa dissociate into acetate(CH3COO-) and sodium ions(Na+). So acetate ion is relatively strong base it reacts with water formed to give OH- ions.

CH3COONa ⇌ CH3COO-  + Na+ ⇌ CH3COOH + OH-

                                                    H2O

5. Beyond equivalence point the titration is identical with strong acid and strong base.

The ions present in the solution past the equivalence point is CH3COOH + OH-

A titration is a technique where an answer of regarded awareness is used to determine the attention of an unknown answer. Commonly, the titrant (the know answer) is brought from a buret to a acknowledged quantity of the analyte (the unknown answer) until the response is whole.

The motive of the titration is the detection of the equivalence factor, the factor at which chemically equivalent amounts of the reactants have been mixed. The quantity of reactants that have been combined at the equivalence point depends on the stoichiometry of the response.

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Propylene glycol and methyl stearate are both common ingredients found in hand creams. These ingredients are included in hand creams to provide a variety of benefits.

Propylene glycol, also known as 1,2-propanediol, is a colorless and odorless liquid. It is used in a wide variety of personal care products, including hand creams, to help moisturize the skin.

Propylene glycol is a humectant, which means that it helps to attract and retain moisture in the skin. It is able to do this by drawing water from the air and bringing it into the skin.

This helps to prevent dryness and flakiness, leaving the skin feeling soft and smooth. Methyl stearate, on the other hand, is a fatty acid ester. It is used in hand creams to help create a protective barrier on the skin. This barrier helps to prevent moisture loss by sealing in the natural oils and water in the skin.

This is important because dry skin is more prone to irritation, cracking, and infection. By creating a barrier on the skin, methyl stearate can help to prevent these issues from occurring.

In conclusion, propylene glycol and methyl stearate are both important ingredients in hand creams. Propylene glycol helps to moisturize the skin by attracting and retaining water, while methyl stearate helps to create a protective barrier that prevents moisture loss. Together, these ingredients work to keep the skin soft, smooth, and healthy.

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The reaction associated with the lattice energy of SrO (ΔH∘latt) is option D) Sr2+(g) + O2-(g) → SrO(s).

This reaction involves the formation of a solid SrO compound from gaseous ions. Lattice energy refers to the energy released when ions come together to form a solid lattice structure. In this case, gaseous Sr2+ and O2- ions combine to form the solid SrO compound. The lattice energy is a measure of the strength of the ionic bonds within the solid lattice, and it is typically exothermic (releasing energy) because the ions become more stable in the solid form.

Lattice energy is associated with the formation of ionic compounds and the energy involved in the formation of a crystal lattice from individual ions. It is a measure of the strength of the ionic bonds within the lattice. Option D) Sr2+(g) + O2-(g) → SrO(s) represents the formation of solid SrO from gaseous Sr2+ and O2- ions. This reaction is directly related to the lattice energy of SrO because it involves the process of ions coming together and arranging themselves in a crystal lattice structure. The release of energy in this reaction is associated with the formation of strong electrostatic attractions between the oppositely charged ions, resulting in the stability of the solid compound. Therefore, option D is the correct choice in this context.

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The solution with the highest vapor pressure is e. They all have about the same vapor pressure.

Vapor pressure is a measure of the tendency of a substance to evaporate. In a solution, the vapor pressure of the solvent is lowered due to the presence of a nonvolatile solute. However, the extent to which the vapor pressure is lowered depends on the concentration of the solute.

In this case, all the given solutions have the same concentration of 0.50 m (molality) for their respective solutes. Since the molality is the same for all solutions, it means that the amount of solute particles present in each solution is the same. As a result, the vapor pressure reduction caused by the nonvolatile solutes will be similar in all cases.

The vapor pressure reduction in a solution depends on the colligative properties, which are determined by the number of solute particles rather than their identity. Hence, irrespective of the nature of the solutes (C3H8O3, C2H6O2, C6H12O6, or C12H22O11), all the solutions will have similar vapor pressure reductions.

Therefore, the main answer is that all the given solutions (a, b, c, d) have about the same vapor pressure, making option e the correct choice.

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In a chemical reaction, there is a change in the composition of the substances in question; in a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition.

A chemical change is a change where something new can be formed and normally can not be changed back. Examples of a chemical change are precipitates being formed, gases being formed, quick temperature change rust, bubbling, foaming, burning, etc. A physical change is a change where nothing new is formed and normally can be changed back. For example you painted a wooden block red. If you want, you can always change the color again. Nothing chemically or permanantly happened to it. More examples of a physical change are; color change, change of state, luster, shape, size, hardeness, etc.      

                                                                                           :)

Answer:

System

Explanation:

I got 100 on Edge

A system is a group of related objects which interact with each other and form a complex whole.

A system can be described as a group of interacting elements that act according to a set of rules to create a unified whole. A system is surrounded by its environment and is described by its boundaries, structure, and purpose.

A system in physics can be described as a collection of objects that can be identified. A system refers to a collection that makes thinking about a problem more convenient.

The surrounding is everything else that is not included in the system. An isolated system is a system in which no energy or matter is exchanged with the surroundings.

A closed system is one in which only energy can be exchanged with the surroundings. The open system is one in which both matter and energy can be exchanged with the surroundings.

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Emerging scientific ideas are new theories or ideas that are gaining attention in the scientific community, but have not yet been fully accepted or confirmed.

Emerging ideas refer to the new and innovative ideas or theories that have yet to gain full scientific acceptance. While a scientific consensus is a view or theory that has been universally accepted and confirmed by multiple experiments or research, an emerging scientific idea is a new and unproven theory or idea that is gaining attention in the scientific community. These emerging ideas may also be referred to as scientific hypotheses. In contrast to scientific consensus, emerging scientific ideas have not yet been subjected to rigorous testing and confirmation.

They are generally proposed to explain new observations or experimental results, which have not yet been fully understood or explained by established scientific theories. Emerging scientific ideas can have the potential to challenge the current scientific consensus. If an emerging scientific idea is found to be valid, it can ultimately lead to the establishment of a new scientific consensus. For example, the emerging scientific idea of the Higgs boson particle led to the discovery of a new field in particle physics, which is now an established scientific consensus.

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The volume of dry carbon dioxide is 55mL measured at 25 degrees Celsius and 785 mm hg, will result from the combustion of 2.50 g of pentane.

Carbon dioxide may be found in solid form as dry ice. Since CO2 does not have a liquid state at normal atmospheric pressure and instead sublimates directly from the solid state to the gas state, it is frequently used for short-term refrigeration. In addition to being utilised in fog machines in theatres for dramatic effects, it is largely employed as a cooling agent.

Its benefits include being colder than water ice and leaving no traces behind (apart from accidental frost from atmospheric moisture). It is helpful for keeping frozen items (like ice cream) from spoiling in situations when mechanical chilling is not possible.

At Earth's atmospheric pressure, dry ice sublimates at 194.7 K (78.5 °C; 109.2 °F). The solid is hazardous to handle without protection against frostbite injuries because to the intense cold. While typically not very toxic, the buildup in confined spaces can make the outgassing from it hypercapnic (abnormally elevated blood carbon dioxide levels).

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Taking into account the definition of calorimetry, the total amount of heat lost by the metal is 286.88 J and  the specific heat of the unkown metal is 0.08757 J/gC.

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

In this way, between heat and temperature there is a direct proportional relationship. The constant of proportionality depends on the substance that constitutes the body and its mass, and is the product of the specific heat by the mass of the body.

So, the equation that allows to calculate heat exchanges is:

Q = c× m× ΔT

where:

In this case, you know:

Being the heat released by the metal the sum between the heat absorbed by the calorimeter and the heat absorbed by the water, you get:

Heat released by the metal= Heat absorbed by the calorimeter + Heat absorbed by the water

Heat released by the metal= Specific heat of calorimeter×ΔT + mass of water×Specific heat of water×ΔT

Heat released by the metal= Specific heat of calorimeter×(Tfinal - Tinitial) + mass of water×Specific heat of water×(Tfinal - Tinitial)

Substituting the corresponding values:

Heat released by the metal= 51.5 J/C×(23.1 - 22)C + 50 g×4.186 J/gC×(23.1 - 22)C

Heat released by the metal= 51.5 J/C×1.1 °C + 50 g×4.186 J/gC×1.1 °C

Heat released by the metal= 56.65 J + 230.23 J

Heat released by the metal= 286.88 J

Finally, the heat released by the metal is 286.88 J.

If two isolated bodies or systems exchange energy in the form of heat, the quantity received by one of them is equal to the quantity transferred by the other body. That is, the total energy exchanged remains constant, it is conserved.

Then, the heat that the metal gives up will be equal to the heat that the water receives. Therefore:

- Qmetal = Heat absorbed by the calorimeter + Heat absorbed by the water

-mass of metal×Specific heat of metal×(Tfinal - Tinitial)= 286.88 J

-42.6 g ×Specific heat of metal×(23.1 - 100)°C= 286.88 J

Solving:

Specific heat of metal×3275.94 gC= 286.88 J

Specific heat of metal=286.88 J÷ 3275.94 gC

Specific heat of metal= 0.08757 J/gC

Finally, the specific heat of the metal is 0.08757 J/gC.

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Answer:

True

Explanation:

Vacuum packing is a method of packaging that removes air from the package  before sealing. ... On a more short-term basis, vacuum packing can also be used to store fresh foods, such as vegetables, meats, and liquids, because it inhibits bacterial growth. Vacuum packing greatly reduces the bulk of non-food items.

Answer: the answer Is d

Explanation:

The question that readers should  ask to determine the effect in the sentence is that what happens when more stuff gathers?

Sentence is defined as a group of words, usually containing a subject and a verb, expressing a statement, question, instruction, or exclamation, and, when written, starting with a capital letter and ending with a period or other mark, example, Your sentences are too long and complicated.Many sentences written together form a paragraph.

In law, a punishment  is which is given by a law court to a person or organization that is guilty of a crime. It is a grammatical unit of one or more words that expresses an independent statement, question, request, command, exclamation, etc.

In print or writing, a sentence typically begins with a capital letter and ends with appropriate punctuation; in speech it displays recognizable, communicative intonation patterns and is often marked by preceding and following pauses.

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The concentration of H3O+ in Solution B is 1000 times greater than in Solution A. The correct answer is (d) 1000. The pH scale is a logarithmic scale that measures the concentration of hydrogen ions (H3O+) in a solution.

A decrease of one pH unit corresponds to a tenfold increase in the concentration of H3O+. Therefore, if Solution A has a pH of 13, it means that the concentration of H3O+ is \(10^{-13}\) M. Similarly if Solution B has a pH of 10, it means that the concentration of H3O+ is \(10^{-10}\) M.
To determine the concentration of H3O+ in Solution B relative to Solution A, we need to find the ratio of their concentrations. We can do this by dividing the concentration of H3O+ in Solution B by the concentration of H3O+ in Solution A:
[ H3O+ ]B / [ H3O+ ]A = \(10^{-10}\) M / \(10^{-13}\) M
Simplifying this expression gives:
[ H3O+ ]B / [ H3O+ ]A = \(10^3\)

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Carbon is a non metal and also has four valence electrons.

My idea about what happens to molecules in the liquid, solid, and gas

phase hasn't changed.

State of matter is the state in which particles exist in nature and there are

three main forms which include:

The phases experiences some form of inter-conversion under various

conditions which include:

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Answer:

The balanced equation for the given reaction is:

2H₂O₂ → 2H₂O + O₂

The type of reaction is a decomposition reaction, where a single compound breaks down into two or more simpler substances. In this case, hydrogen peroxide (H₂O₂) decomposes into water (H₂O) and oxygen gas (O₂). This is a chemical reaction, as the original compound is transformed into new substances with different properties.

Explanation:

According to the previous session, the equation is:

Deuterium 2/1 H + Tritium 3/1 H -> 4/2 He + 1/0 n + energy