Question

A watershed is the area of land where all of the water drains off and eventually combines at a central point. As water runs off it picks up different types of surface pollution leftover from agricultural, industrial, commercial, and other types of human activity. Why does the pollution in a watershed have such a heavy impact on its inhabitants?

Responses

A the water combines and the pollutants become more concentratedthe water combines and the pollutants become more concentrated

B the water combines and the pollutants become less concentratedthe water combines and the pollutants become less concentrated

C the species that inhabit the watershed must have the pollution in order to survivethe species that inhabit the watershed must have the pollution in order to survive

D pollution does not affect the inhabitants of a watershed

Piloerection is the reaction most likely to happen if Argus fell into waters around Labrador.

Piloerection is a phenomenon or a reaction causing erection of hairs or papillae of the skin due to the contraction of the tiny arrectores pilorum muscles (tiny muscles located at the origin of each body hair) that elevate the hair follicles above the rest of the skin and moves hair vertically, so hair seems to stand o the end.

When Argus fell into the water of temperature 1°C, or 34°F around Labrador, piloerection happens because Argus might be scared and cold, which makes his hair stand up or cause goosebumps.

Piloerection is a primary physical elicitor kind of response to cold or shock. In Argus and other animals, erection of coat hairs or feathers serves to increase the isolation layer of air around the body.

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Homolysis is the process of breaking a covalent single bond when, as in the first example, one of the shared pair's electrons is still present with each fragment. Heterolysis is the term for when a bond breaks while still having one fragment and both of the sharing pair's electrons, as in the second and third examples.

How can this result be explained based on bond breaking in bond making that is occurring?

Due to electrical charges and the fact that both water and salt molecules are polar, with positive and negative charges on opposite sides of the molecule, salt dissolves in water at the molecular level.

The chloride ion is negatively charged, while the sodium ion is positively charged, which is why the bonds in salt compounds are referred to as ionic. A water molecule is also ionic in nature, but the link is covalent because two hydrogen atoms place their positive charges on opposite sides of the oxygen atom, which has a negative charge. Water's covalent bonds are more powerful than salt molecules' ionic bonds, so when salt is combined with water, the salt dissolves.

The negatively charged side of the water molecules is drawn to the positively charged sodium ions, whereas the positively charged side is drawn to the negatively charged chloride ions. In essence, a tug-of-war takes place, with the water molecules coming out on top. The ionic link that held sodium and chloride ions together is broken when water molecules force the ions apart. As seen in this picture, the sodium and chloride atoms are encircled by water molecules after the salt compounds are separated. After that, the salt dissolves and forms a homogenous solution.

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Chemical energy is a form of potential energy because the energy stored in the chemical bonds can be used to generate work when they are broken down in exothermic reactions.

Chemical energy is a form of potential energy because the bonds of compounds (e.g. foods) may release energy when they are break down during enzymatic reactions, thereby storing potential energy that is transformed into kinetic energy.

In conclusion, chemical energy is a form of potential energy because the energy stored in the chemical bonds can be used to generate work when they are broken down in exothermic reactions.

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The answer is catalysts.

What is the function of enzymes within living systems? Catalysts.

Because Enzymes work as CATALYSTS within living system.

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When 28.5 g of iron shot is added to a graduated cyclinder containing 45.5 ml of water, the water level rises to 49.9 ml. The density of iron would be 7.92 g/ml approax 8 g/ml.

As we already know that density is defined as the mass divided by volume (Mass/ volume).

It is denoted by ρ.

The unit of density is g/ml

Now the Question is

Mass of iron shot = 28.5 g

Density of water at normal = 45.5 ml

Density of water when rises = 49.1 ml

ρ, density = Mass / Volume

= 28.5 g / (49.10 −45.50)mL

= 7.92 g / mL

Approximately 8 g/ml

Hence, the density of iron is 7.92 g/ml approax 8 g/ml.

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The density of the glycerol is 1250g/l.

Density refer to the mass of an object or particles with ratio to its volume.

Density =mass÷volume.

Mass of the object is 3.10^3

volume is 2.50l

Density = 3.10^3÷2.50

Density of the glycerol is 1250g/l

Therefore, The density of the glycerol is 1250g/l

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Ionic equation is

[tex]Na^{+} _{3} }[/tex](aq) + 2[tex]PO_{4} ^{-3}[/tex](aq) + 3[tex]Mg^{2+}[/tex](aq) + 3[tex]Cl_{2} ^{-}[/tex]-----> [tex]Mg_{3}(PO_{4} )_{2}[/tex]((s) + 3[tex]Na^{+}[/tex](aq) + 3[tex]Cl^{-} _{2}[/tex](aq)

Here the reaction of aqueous magnesium chloride is mixed with aqueous sodium phosphate.

i.e., Mg[tex]Cl_{2}[/tex] react with [tex]Na_{3}PO_{4}[/tex]

Here the reaction is the replacement reaction, so when both magnesium chloride reacts with sodium phosphate it forms magnesium phosphate and sodium chloride.

3Mg[tex]Cl_{2}[/tex] (aq) + 2[tex]Na_{3} PO_{4}[/tex] (aq) ------->  [tex]Mg_{3} (PO_{4} )_{2}[/tex](s) + 6NaCl (aq)

And the ionic equation is:

[tex]Na^{+}_{3} }[/tex] (aq) + 2[tex]PO^{3-} _{4}[/tex] (aq) + 3[tex]Mg^{2+}[/tex](aq) + 3[tex]Cl^{-} _{2}[/tex] (aq)-------> [tex]Mg_{3} (POx_{4} )_{2}[/tex](s) + 3[tex]Na^{+}[/tex](aq) + 3[tex]Cl^{-} _{2}[/tex] (aq)

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In a muscle without lactate dehydrogenase, the availability of NAD+ is what limits the amount of ATP that can be produced by glycolysis.

An organic substance called adenosine triphosphate powers a variety of biological functions in living cells, including muscular contraction, nerve impulse transmission, condensate dissolving, and chemical production.

A vital "energy molecule" present in all living things is adenosine 5′-triphosphate, also known as ATP and typically written without the 5′-. In particular, it is a coenzyme that transfers energy to cells by releasing its phosphate groups when it interacts with enzymes like ATP triphosphatase.

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The empirical formula for the compound containing 42.88% carbon and 57.1% oxygen by mass is Carbon Monoxide (CO).

To find the empirical formula for 42.8% carbon (C) and 57.1% oxygen (O)

First, find the molar mass of each component-

    C = 12.010, O = 15.999

Converting to the moles :

    C = 3.563, O = 3.568

Finding smallest mole value :

    C = 3.563

Dividing all components by smallest value :

    C = 1, O = 1.001

By rounding off -

    C = 1, O = 1

Combining to get empirical formula : CO

Now, multiplying all by 1 ( molar mass of empirical formula/molar mass of sample = 28.01 / 28.034 ) to get molecular formula : CO

Since multiplied by 1, Therefore, the empirical formula and molecular formula are same.

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The balanced equation can be written as follows,

[tex]Mn(s)+Cd ^ {2+} (aq)[/tex]→[tex]Mn^{2+} (aq)+Cd(s)[/tex]

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Sum of squares for the group that didn't get treatment is 228.333. Reporting the answer to two decimal is 228.33.

A decimal is a number that consists of a whole and fractional part. Decimal numbers lie between the integers and represent the numerical value for quantities that are whole plus some part of a whole.

We get the decimals when we break a whole into smaller parts. A decimal number then has the two components: a whole number part and fractional part. The decimal place value system for whole part of a decimal number is the same as the whole number value system. However, we get fractional part of the decimal number as we move toward the right after the decimal point.

Decimals are a set of numbers lying between the integers on a number line. They are just the another way to represent fractions in mathematics. With the help of the decimals, we can write more precise values of measurable quantities like length, weight, distance, money, etc.

The numbers to the left of decimal point are the integers or whole numbers and the numbers to the right of the decimal point are decimal fractions. If we go right from the ones place, the next place will be (1/10) times smaller, which will be (1/10)th or tenth place value.

Sum of squares for the non-treated group = 13700 seconds

                                                                        =[tex]\frac{13700}{60}[/tex]

                                                                        = 228.333 minutes

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The complete question is:

"Assume you are interested in evaluating the effectiveness of a training program designed to decrease the time required to complete a skilled motor task. Seventeen subjects are randomly assigned to one condition or another: Ten subjects are randomly assigned to receive the training program. A second group of 7 subjects receives no training. All subjects then perform the motor task. Test whether training had any effect on the time (in seconds) required to complete the task using a two-tailed t-test (α = .05). Descriptive statistics for the time required to complete the task (in seconds) are presented below for each group.

Trained group                             Non trained group

  X         [tex]X^{2}[/tex]                                         X         [tex]X^{2}[/tex]

  33       1089                                   50         2500

  41         1681                                    46         2116

  38         1444                                   47          2116

   26        676                                    48         2209

  28         784                                    37         1369

   34         1156                                   39          1521

   32         1024                                  41           1681

   30         900

   31           961

   37          1369"

The Concentration of NaOH solution when NaOH solution was titrated with 25cm3 of a 0.75mol/dm3 HNO3 is 26.4 g/dm3.

Given,

Volume of HNO3 is 25cm³ = 0.025 dm³

Amount of solute in mol = concentration in mol/dm3 × volume in dm3

Amount of HNO3 = 0.75 × 0.025 = 0.018 mol

The balanced equation is: NaOH(aq) + HNO3(aq) → NaNO3(aq) + H2O(l)

So the mole ratio NaOH:HNO3 is 1:1

Therefore 0.018 mol of NaOH reacts with 0.018 mol of HNO3.

Volume of sodium hydroxide solution 27.20cm³ =

0.027 dm³.

Concentration = 0.018 / 0.027 = 0.66 mol/ dm³

Relative formula mass of NaOH= 40

Mass = relative formula mass × amount

Mass of HCl = 40 × 0.66

= 26.4

So concentration = 26.4 g/dm3

Therefore, concentration of NaOH is 26.4 g/dm3

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A sulfide of gold is composed of 6.31g sulfur and 25.93g of gold. Determine the percent of both elements in the compound. 7. Peaches are 8.6% sugar by mass.

A chemical compound is a substance made of numerous similar molecules (or molecular entities), each of which contains atoms from different chemical elements and is bound together by chemical bonds. Since only one element's atoms make up a molecule, it is not a compound. A chemical reaction, which could involve interactions with other molecules, can change one component into another. It's possible for atom-to-atom bonds to break or develop throughout this process.

Depending on how the atoms in the molecule are bound together, there are four main types of compounds. Covalent bonds hold together molecular molecules, while ionic bonds, metallic bonds, ionic bonds, ionic bonds, ionic bonds, ionic bonds, ionic bonds, ionic bonds, ionic bonds, ionic bonds, ionic bonds, ionic bonds, ionic bonds, ionic bonds,

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As the concentration of carbonate ions is increased, the speed of calcification increases.

Why is carbonate important for ocean life?

Calcium carbonate minerals are the life  blocks for the skeletons and shells of several marine organisms. In areas where most life now congregates within the ocean, the seawater is supersaturated with regard to calcium carbonate minerals.

How do organisms use carbonate?

the most way is via photosynthesis by phytoplankton, where CO2 and sunlight are wont to produce sugars and a waste product of oxygen. carbon are often utilized in the calcium carbonate shells of animals including corals, clams, mussels, oysters.

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The Periodic Table of Elements has 118 different elements, including aluminum. It is natural as a result.

13 protons and 13 electrons make up an aluminum atom. The outer shell has three valence electrons. Aluminum is a relatively soft, robust, and light metal under normal circumstances. Rarely is pure aluminum found on Earth in its free form since it is a particularly reactive element.

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If a 125 ml erlenmeyer flask weighs 88.5 g, then the volume of erlenmeyer flask in litre is 0.125 litre

Here given data is 125 ml erlenmeyer flask and weighs of erlenmeyer flask  that is 88.5g  

So, in that 125 ml erlenmeyer flask are seen only not the weighs are seen here the weighs of the erlenmeyer flask should not matter here

So, 125ml= 0.125 liters

Here correct answer choices is 0.125 liters

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Try 35% ethyl acetate to see the results, this is because adding more ethyl acetate will increase the polarity and the compounds get easily separated.

In TLC, the polarity between the stationary phase and mobile phase is the basis for mixture separation. In accordance with the "like dissolves like" principle, polar substances can only dissolve in other polar substances, while non-polar substances may only dissolve in other non-polar substances. Consequently, when two compounds with different levels of polarity are present, the more polar molecule interacts with silica more strongly and is therefore better able to displace the mobile phase from the accessible binding sites. The less polar compound thus travels higher up the plate (resulting in a higher Rf value).

However, changing the mobile phase to a more polar solvent or mixture of solvents improves binding to the polar plate and thereby displacing solutes from it, causing all compounds on the TLC plate to rise higher up the plate. It is a prevalent belief that although "weak" eluents hardly move the examined compounds, "strong" eluents drive them up the plate.

Therefore, all compounds move longer and have a larger Rf when a mobile phase is made more polar than it was originally.

Since hexane has a non-polar property while ethyl acetate has a polar property. As a result, adding 35% ethyl acetate will enhance the polarity, making it easier to separate the compounds.

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Answer:

Hydrogen

Explanation:

The atom only has one proton and one electron making it the first element in the periodic table.

Answer

Provide the body with the calories, or energy, to grow as well.

The third test tube has the largest amount of precipitate. The correct ratio for this reaction is 1:1.

Test tubes intended for the general chemical work are usually made of glass, and for its relative resistance to heat. Tubes made from the expansion-resistant glasses, mostly borosilicate glass or fused quartz, can withstand high temperatures up to several hundred degrees Celsius.

Chemistry tubes are available in a multitude of the lengths and widths, typically from 10 to 20 mm wide and 50 to 200 mm long. The top often features a flared lip to aid pouring out contents.

A chemistry test tube typically has flat bottom, a round bottom, or a conical bottom. Some test tubes are made to accept a ground glass stopper or  screw cap. They are often provided with small ground glass or white glaze area near the top for labelling with a pencil.

Test tubes are widely used by the chemists to handle chemicals, especially for qualitative experiments and assays. Their spherical bottom and vertical sides reduce mass loss when pouring, make them easier to wash out, and allow convenient monitoring of contents. The long, narrow neck of the test tube slows down the spreading of gases to the environment.

Test tubes are convenient containers for heating the small amounts of liquids or solids with a Bunsen burner or alcohol burner. The tube is usually held by its neck with clamp or tongs. By tilting tube, the bottom can be heated to hundreds of degrees in the flame, while the neck remains relatively cool, possibly allowing vapors to condense on its walls. A boiling tube is large test tube intended specifically for boiling liquids.

In reaction:

CuSO4 + Na2S ⇒ CuS + Na2SO4

Third test tube had largest amount of precipitate.

In third test tube all Cu2+ ion converted into CuS precipitate.

Test Tube         Ratio

1                          5:1

2                          2:1

3                           1:1

4                           1:2

5                          1:5

so, the correct ratio is 1:1.

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the IUPAC nomenclature  name for ch₃ch₂con(ch₃)ch₂ch₃  for five carbon atoms is 2- METH- BUTANE

The International Union of Pure and Applied Chemistry :

The International Union of Pure and Applied Chemistry (IUPAC) is that the world authority on chemical nomenclature, terminology (including the naming of latest elements in the periodic table), standardized methods for measurement, atomic weights and lots of other critically-evaluated data.

What is the IUPAC naming system?

IUPAC nomenclature is predicated on naming a molecule's longest chain of carbons connected by single bonds, whether during a continuous chain or in a ring. All deviations, either multiple bonds or atoms aside from carbon and hydrogen, are indicated by prefixes or suffixes consistent with a specific set of priorities

What is IUPAC and its function?

The International Union of Pure and Applied Chemistry (IUPAC) is that the world authority on chemical nomenclature and terminology, including the naming of latest elements in the periodic table; on standardized methods for measurement; and on atomic weights, and lots of other critically-evaluated data.

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Answer:

A 65 + |−5| = 70°, 65° is the farthest from 0°

Explanation:

Answer:

A

Explanation:

This question involves absolute value which makes negative positive

which is farther from 0, 5 or 65?

The amino acid structure of histidine and classification.

What is histidine ?

An important amino acid that is crucial to the production of proteins is histidine. It is classified as a positively charged amino acid in terms of physiological pH since it contains a carboxylic acid group, a -amino group, and an imidazole side chain.

Arginine (Arg), lysine (Lys), and histidine are the three amino acids with basic side chains at neutral pH. (His)

Because the basic nitrogen atom in imidazole of histidine has a single electron pair, metallic cations like Zn 2+ and Ca 2+ can bind to it as a coordinate ligand [26, 27]. Interaction of hydrogen bonds [28–31].

The H bond formation are possible at 7.4pH since it is the pH of our blood.

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In a process known as nucleosynthesis, fusion powers stars and creates nearly all elements. As a main-sequence star, the Sun generates its energy through the nuclear fusion of hydrogen nuclei into helium. Each second, the Sun's core fuses 620 million metric tons of hydrogen and produces 616 million metric tons of helium. The fusion of lighter elements in stars has energy and mass that is always present.

Nuclear fusion reactions power the Sun and other stars. A fusion reaction occurs when two light nuclei combine to form a single heavier nucleus. Because the total mass of the resulting single nucleus is less than the mass of the two original nuclei, the process releases energy. The remaining mass is converted into energy.

The occurrence of nuclear fusion in stars causes energy to be released from the core in the form of heat or light, or sometimes another nucleus. According to this, nuclear fission in stars virtually releases all elements.

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A white precipitate is formed which is soluble in excess of sodium hydroxide.

Sodium hydroxide is primary in nature. It reacts with steel chlorides and forms metal hydroxides as goods. we can stumble on the formed steel hydroxide within the form of a precipitate. by way of including an excess quantity of sodium hydroxide the shaped steel hydroxide precipitate goes too soluble. when an excess of sodium hydroxide is introduced to guide nitrate, sodium plumbite is shaped which gives a colourless solution.

Sodium hydroxide solution seems like a drab liquid. extra dense than water. touch may also severely worsen skin, eyes, and mucous membranes. while lead nitrate solution is reacted with excess sodium hydroxide solution it offers a clean solution via forming lead hydroxide which is colourless in nature. while sodium hydroxide is brought drop sensible till in extra to a solution of zinc sulphate it's far found that white precipitate is shaped that's soluble in excess of sodium hydroxide.

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Activation energy is defined as the least quantity of extra energy needed by a reacting molecule to get transformed into product.

Activation energy is nearly pertained to its rate.

According to question,

Sodium is might be a generous elements in the earth’s crust layer. It is also a extremely reactive metal, so it doesn’t sway in every direction for very long as free atoms. Since it has a single electron in its outer most shell, which it contributes willingly, Na relate with other reactive elements for the formations of compounds like NaCl and NaOH etc.

Sodium doesn't required any heating to react.

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Answer:

The amount of zinc for a given amount are 0.0082 moles.

Explanation:

Answer:

No. of moles = 0.0082

Explanation:

To calculate the number of moles of a substance given its mass, we can use the following formula:

[tex]\boxed{\mathrm{No. \ of \ moles = \frac{Mass}{Molar \ mass}}}[/tex]

The molar mass of zinc is 65 g/mol. The given mass of Zn in this question is 0.535 g. Using this information and the formula above, we can calculate the number of moles of Zn:

No. of moles = [tex]\mathrm{\frac{0.535 \ g}{65 \ g/mol}}[/tex]

                     = 0.0082 mol

Therefore, there are 0.0082 mol Zn in 0.535 g of Zn.