Nitrates and phosphates are examples of
a. disease-causing agents
b. oxygen-demanding wastes
c. sediment
d. organic chemicals
e. inorganic plant nutrients

Answer: D. a mixture

Explanation: When you mix different types of nuts or snacks together including raisins, hazelnuts, almonds, and peanuts to make some kind of trail mix, then you are creating a mixture, specifically a heterogeneous mixture.

Answer:

The reaction that occurs is a redox reaction. The Copper metal (Cu 0)on the copper pennies is oxidized in concentrated nitric acid to produce Cu2+ ions. Copper is easily oxidized to Cu2+, which is blue in aqueous solutions (water) so you should see the solution turn blue as the copper penny reacts.

Have a nice day ;)(^-^)

Taking into account the definition of chemical and physical change, the reaction of the copper penny with nitric acid is a chemical change.

Physical changes are those in which the substances involved are the same before and after the change. That is, a physical change is a transformation in which the nature of matter does not change.

Chemical changes are considered to be those in which the substances involved are transformed into totally different ones.

In this way, the initial substances do not exist after the phenomenon has occurred and instead, new substances are formed, different from the initial ones.

That is, a chemical change is a transformation in which the nature of matter varies.

When a penny of copper reacts with nitric acid, a redox reaction occurs where the copper metal in the copper pennies is oxidized to produce Cu²⁺ ions, whereas because the nitric acid oxidizes the copper, the nitric acid itself is reduced to nitric oxide (NO). Nitric oxide then reacts with oxygen in the air to produce nitrogen dioxide (NO₂). This can be represented by:

Cu + 4 HNO₃ → Cu²⁺(ac) + 2 NO₃⁻  + 2 NO₂ + 2 H₂O

Finally,  the reaction of the copper penny with nitric acid is a chemical change because a redox reaction occurs.

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Answer:

Chlorine is more electronegative than iodine. The electronegativity of chlorine is 3.16. The electronegativity of iodine is 2.66.

Answer:

3 different elements make up Glucose

Explanation:

C = Carbon ( *6 )

H = Hydrogen ( *12 )

O = Oxygen ( *6 )

Answer:

0.08 atm

Explanation:

The pressure change of a gas at constant volume can be determined using the ideal gas law:

PV = nRT

Where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.

Since the volume is constant, we can simplify the ideal gas law to:

P = (nRT) / V

The number of moles and the gas constant are constant for a given sample of gas, so we can further simplify to:

P1 / T1 = P2 / T2

Where P1 and T1 are the initial pressure and temperature, and P2 and T2 are the final pressure and temperature.

Plugging in the given values:

P1 = 2.50 atm

T1 = 30.0 + 273.15 = 303.15 K

T2 = 40.0 + 273.15 = 313.15 K

P2 = (P1 * T2) / T1

P2 = (2.50 atm * 313.15 K) / 303.15 K

P2 = 2.58 atm

Therefore, the pressure change when a constant volume of gas at 2.50 atm is heated from 30.0 °C to 40.0 °C is 0.08 atm (2.58 atm - 2.50 atm).

Answer:

Explanation: 0.08

The answer for the given question is 48.97g of Na

What is chemical reaction ?

A chemical reaction is a process that involves the transformation of one or more substances into one or more new substances with different properties. During a chemical reaction, bonds between atoms in the reactants are broken and new bonds are formed to produce the products

To solve this problem, we need to use stoichiometry, which is a way of calculating the amounts of reactants and products in a chemical reaction.

Step 1: Balance the equation.

The equation is already balanced.

Step 2: Convert the volume of H2 to moles.

We know that 27 L of H2 was produced, so we can use the ideal gas law to convert this volume to moles:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.

Assuming standard conditions (STP) for the gas, we have:

P = 1 atm

V = 27 L

T = 273 K

R = 0.08206 L·atm/K·mol

Substituting these values into the equation, we get:

n = PV/RT = (1 atm)(27 L)/(0.08206 L·atm/K·mol)(273 K) = 1.06 mol H2

Step 3: Use stoichiometry to find the moles of Na.

From the balanced equation, we see that 2 moles of Na react with 1 mole of H2. Therefore, the number of moles of Na that reacted is:

n(Na) = 2 × n(H2) = 2 × 1.06 mol = 2.12 mol Na

Step 4: Convert the moles of Na to grams.

To convert moles to grams, we need to use the molar mass of Na, which is 22.99 g/mol. Therefore:

mass(Na) = n(Na) × molar mass(Na) = 2.12 mol × 22.99 g/mol = 48.97 g Na

So the answer we get is 48.97g of Na, which is different from the given answer of 55.40g Na. This may be due to rounding or a different assumption of STP.

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The mass of 7,00 × 10²² NaOH molecules is 4,64 gram. 7,00 × 10²² NaOH molecules equal 0.116 moles NaOH.

To find out the mass of 7,00 × 10²² NaOH molecules you can use the following steps

Step 1: The first step is to calculate the number of moles of the compound.

mol = number of particles ÷ Avogadro's number

      = 7,00 × 10²² ÷ 6,022 × 10²³

      = 0,116 mol

Step 2: The next step is to calculate the mass of the molecules.

mass = mol × relative molecular mass

         = 0,116 mol × 40 gram/mol

          = 4,64 gram

So the mass of 7,00 × 10²² NaOH molecules is 4,64 gram.

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The pH of a 0.15 M aqueous solution of KF for hydrofluoric acid is 3.15.

Hydrofluoric acid (HF) is a weak acid and partially dissociates in water to form H+ and F⁻ ions. KF is the salt of a strong base (KOH) and a weak acid (HF), so it will undergo hydrolysis in water to form OH⁻ ions and HF molecules.

The hydrolysis reaction of KF can be represented as:

KF + H₂O ↔ K⁺ + OH⁻ + HF

Since the concentration of KF is 0.15 M, the concentration of K⁺ ions and F⁻ ions in the solution is also 0.15 M. Initially, the concentration of OH⁻ ions is zero.

Now, we need to determine the equilibrium concentration of OH⁻ ions in the solution to calculate the pH. The equilibrium constant expression for the hydrolysis reaction of KF is:

Kb = [K⁺][OH⁻]/[KF]

where Kb is the base dissociation constant for KF.

The value of Kb for KF can be calculated using the acid dissociation constant (Ka) for HF:

Kw = Ka x Kb

where Kw is the ion product constant for water.

At 25°C, Kw = 1.0 x 10⁻¹⁴ and Ka for HF = 7.2 x 10⁻⁴.

Therefore, Kb for KF can be calculated as:

Kb = Kw/Ka = (1.0 x 10⁻¹⁴)/(7.2 x 10⁻⁴) = 1.4 x 10⁻¹¹

Now, we can use the equilibrium constant expression to calculate the equilibrium concentration of OH⁻ ions:

Kb = [K⁺][OH⁻]/[KF]

1.4 x 10⁻¹¹ = (0.15 M)([OH⁻])/0.15 M

[OH⁻] = 1.4 x 10⁻¹¹ M

Finally, we can calculate the pH of the solution using the equation:

pH = 14 - pOH

pOH = -log[OH⁻] = -log(1.4 x 10⁻¹¹) = 10.85

pH = 14 - 10.85 = 3.15

Therefore, the pH of a 0.15 M aqueous solution of KF is 3.15.

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₀n¹ -----------> ₁H¹ + ₋₁e⁰ + ν + q, Beta decay converts a neutron to a proton and emits an excessive-energy electron, producing a daughter nucleus with an equal mass.

Number as the parent and an atomic number that is higher by means of 1. Positron emission is the alternative to beta decay and converts a proton to a neutron plus a positron.

Two numbers are connected to the image. The variety on the upper right is the mass range, also referred to as the 'A' range. The 'A' wide variety describes the atomic weight of the atom and identifies the number of protons and neutrons within the nucleus.

In positron emission, additionally referred to as high-quality beta decay β+-decay, a proton within the determined nucleus decays right into a neutron that remains in the daughter nucleus, and the nucleus emits a neutrino and a positron, which is an advantageous particle like a regular electron in mass but of opposite price.

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Answer:

the boiling point of HF is higher than H2 and F2

Explanation:

it is because inter molecular give is present in HF because of the Hydrogen bond present. Hydrogen bond is strong and will require much energy to break ,since no hydrogen bond is in the rest H2 and F2 has a low boiling point

The boiling point of a liquid depends upon the pressure of the surrounding. Here HF has higher boiling than the molecule of hydrogen and fluorine due to the presence of hydrogen bonding between 'H' and 'F' atoms.

The temperature at which the vapor pressure of the liquid becomes equal to the atmospheric pressure of the liquid's environment is defined as the boiling point. A t this temperature, the liquid is converted into a vapour.

The intermolecular forces can be used to predict the relative boiling points. If stronger is the intermolecular force, the lower is the vapor pressure of the substance and the higher is the boiling point.

The order of intermolecular forces are:

H - bonding > dipole-dipole > London dispersion (Van der Waals)

Here HF has intermolecular hydrogen bonding which is not present in H₂ and F₂ and has high boiling point.

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The monoprotic acid is HCl. A monoprotic acid is one that dissociates into only one hydrogen ion or ions in an aqueous solution.

How do monoprotic and diprotic acids differ?

The ability of monoprotic acids to donate one hydrogen atom or proton to their aqueous solution as opposed to diprotic acids to provide two hydrogen atoms or protons is the primary distinction between the two types of acids.

What strength of acid is monoprotic acid?

H2 SO4 and H3 PO4 are examples of polyprotic acids that contain two or three hydrogen ions. Although it is alluring to believe that polyprotic acids are more powerful than monoprotic acids since they include several hydrogen ions, this is not the case.

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5- perfume sprayed in the air

6- I'm really sorry but I'm not sure

Answer: Here u go!

Explanation:

a) Atomic radius (excluding noble gases)  (Decrease)

b) First ionization energy  (Increase )

c) Electronegativity  ( Increase)

Hope this helps!(it took me a while sry)

The atomic radius will decrease, first ionization energy will increase, and electronegativity will increase from left to right across the periodic table.

Explanation:

So, from this, we can conclude that atomic radius will decrease, first ionization energy will increase, and electronegativity will increase from left to right across the periodic table.

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At pH 0, glutamate (C5H8NO4-) exists predominantly as an anion with a negative charge.

HOOC-CH2-CH2-CH(NH3+)-COO-

The carboxyl group (-COOH) on the left side of the molecule is deprotonated, resulting in a negatively charged carboxylate group (-COO-). The amino group (-NH2) on the right side of the molecule is protonated, carrying a positive charge (+NH3+). The central carbon atom is connected to the rest of the molecule with a single bond.

It's important to note that the pH of 0 is highly acidic, and glutamate is found in this charged form due to the low pH environment. In physiological conditions or at higher pH levels, glutamate will exist in different forms depending on the pH of the solution.

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Answer:

Option A.

Explanation:

1 mol of anything contains 6.02×10²³ particles.

We know that 1 mol of oxygen gas contains 2 moles of O.

1 mol of oxygen weighs 16 g/mol, the mass for 1 molecule of O.

By the way, the mass for 1 mol of O₂ may be:

Option A  →  16 g/mol . 2 mol

32 g

Oyxgen is a dyatomic molecule, that's why we have 2 moles of O.

Another example can be:

1 mol of water (H₂O) contains 2 moles of H and 1 mol of O.

Answer:

Genome

Explanation:

The correct answer is option D.

Among the trace minerals, iron is the mineral that is found in highest concentrations in the body.

In human body, there are 21 trace minerals that are expected to be present including copper, zinc, iron cobalt, manganese, and fluoride.

The function of each trace mineral varies and they play huge role in the growth and development process.

For proper functioning of human body, only small quantities of these minerals are required. Among 21 minerals, iron is found in huge quantities.

Certain foods are rich sources of these minerals. However, deficiency or excess of these minerals can lead to serious health issues.

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Answer:

d is the answer I think .....

H₂CO₃ will be produced faster  if carbonic anhydrase acts as a catalyst and the correct option is option B.

Carbonic anhydrase enzyme helps to maintain acid-base homeostasis, fluid balance and regulate pH. Based on its location, the enzyme role changes slightly.

The inter-conversion that occurs between water, carbon dioxide, and dissociated carbonic acid ions, is catalyzed by a group of enzymes that form by carbonic anhydrase, or carbonate dehydratase.

The active site for most carbonic anhydrase is supposed to be a zinc ion, and it is as a result classified as metalloenzymes.

Therefore, H₂CO₃ will be produced faster  if carbonic anhydrase acts as a catalyst and the correct option is option B.

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The mass of \(Al_{2} S_{3}\) produced is 15.616 grams.

The reaction taking place is as follows:

\(2Al+ 3S\) →\(Al_{2} S_{3} (s)\)

Moles of Al = mass/molar mass = 10.0g/27.0g/mol

= 0.370 mol

Moles of S = mass/molar mass = 15.0g/(32.065g/mol)

= 0.468 mol

Al and S reacts in the molar ratio of 2:3.

2 moles of Al reacts with 3 moles of S

0.370 moles of Al will react with S = (3/2)*0.370mol

= 0.555 mol

Similarly, 0.468 moles of S will react with Al = 2/3 *0.468mol

= 0.312 mol

Thus, Al is in excess and S is the limiting reactant (some of Al will be left over ,S will completely react)

So, moles of \(Al_{2} S_{3}\) produced=1/3*0.312 mol of S

= 0.104 mol

Mass of \(Al_{2} S_{3}\) produced = moles*molar mass of \(Al_{2} S_{3}\)

= 0.104mol*150.158g/mol

= 15.616 grams

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The most accurate way to determine who made a more concentrated salt water mixture is to measure the salinity of each mixture.

Salinity is the measure of the amount of salt dissolved in water, and is usually measured in parts per thousand (ppt). To measure the salinity of the salt water mixtures, you can use a refractometer, which measures the refractive index of a sample and provides a numerical reading. The higher the number, the more concentrated the salt water mixture. The students can then compare their results to see who made a more concentrated salt water mixture.The person who has the higher amount of salt per liter of water has made the more concentrated salt water mixture.

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Answer:

A Physical Model might include a drawing or a three-dimensional object.

Hope this helps ^^

The pillar of sustainability broken by recycling electronics in India is environmental sustainability. Implementing a law that restricts electronics recycling to the US would not necessarily be the most effective solution, as it overlooks the complex global dynamics of electronic waste management.

Recycling electronics in India often involves improper disposal methods, such as burning or dismantling without proper safety measures. This leads to environmental pollution, including the release of hazardous substances into the air, soil, and water, thus violating the principle of environmental sustainability.

However, simply mandating that electronics can only be recycled in the US may not be the most optimal solution. Electronic waste is a global issue, and restricting recycling to a single country disregards the fact that electronic products are manufactured and consumed worldwide. A more comprehensive approach to addressing electronic waste would involve international cooperation, strict regulations, and monitoring of recycling practices to ensure they meet environmental standards.

Efforts should focus on improving recycling practices globally, including promoting responsible electronic waste management, developing sustainable recycling infrastructure in multiple countries, and encouraging the adoption of safe and environmentally friendly recycling practices. This approach would foster global sustainability and address the challenges associated with electronic waste disposal more effectively than a geographically limited restriction.

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The equivalence points of the titration curves were not in the same pH range due to differences in the acid and base strengths of the titrants used in the titration reactions.

In a titration, the equivalence point is reached when the stoichiometrically equivalent amounts of acid and base have reacted. At this point, the solution is neutral, and the pH is determined by the nature of the salt formed.

The pH range at the equivalence point depends on the acid and base used in the titration. Strong acids and strong bases have a high degree of dissociation in water, resulting in a large concentration of ions and a pH close to 7 at the equivalence point.

On the other hand, weak acids and weak bases have a lower degree of dissociation, leading to lower concentrations of ions and a pH that deviates from neutrality at the equivalence point. The pH range at the equivalence point for weak acids and weak bases can vary depending on their dissociation constants and concentrations.

Therefore, if different titrants with different acid and base strengths are used in titration reactions, the equivalence points may not occur in the same pH range. The acid-base properties of the titrants influence the pH at the equivalence point, resulting in variations in the pH range observed in the titration curves.

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Answer:

The answer is D

Explanation:

One or more new substances formed.

Answer:

D.One or more new substances formed.

Explanation:

Answer:

loses, gains

Explanation:

In the ionic compound aluminum selenide, each atom of aluminum will lose electrons while each atom of selenium will gain the electrons.

An ionic compound is an interatomic bond formed between a metal and non-metal. The metal is less electronegative compared to the non-metal. In this case, the metal will lose electrons to become positively charged whereas the non-metal, selenium will gain the electron to become negatively charged.

The electrostatic attraction between these oppositely charged ions leads to the formation of the ionic bond.

The quantity of heat required to change the temperature of an object is determined by the specific heat capacity of the material and the mass of the material. The specific heat capacity of water is 4.18 J/g·°C. Given that 50.0 grams of water are cooled from 70.0 oC to 60.0 oC,

we can determine the amount of heat energy released by using the following formula:

Q = m·C·ΔT

where Q is the heat energy released, m is the mass of the material, C is the specific heat capacity of the material, and ΔT is the change in temperature.

Substituting the values, we get:

Q = 50.0 g × 4.18 J/g·°C × (70.0 oC - 60.0 oC)
Q = 2090 J

Therefore, 2090 joules of heat energy are released when 50.0 grams of water are cooled from 70.0 oC to 60.0 oC.

The specific heat capacity of water is 4.18 J/g·°C. Therefore, the amount of heat energy required to change the temperature of water depends on the specific heat capacity of water and the mass of water. In this problem, we are given the mass of water, which is 50.0 grams, and the temperature change, which is 10 oC (from 70.0 oC to 60.0 oC). Using the formula Q = m·C·ΔT, we can calculate the amount of heat energy released. Substituting the values, we get:

Q = 50.0 g × 4.18 J/g·°C × (70.0 oC - 60.0 oC)
Q = 2090 J

Therefore, 2090 joules of heat energy are released when 50.0 grams of water are cooled from 70.0 oC to 60.0 oC. This means that the water has given off 2090 joules of heat to the surroundings as it cooled down. The result obtained is consistent with the fact that water has a high specific heat capacity. The high specific heat capacity of water makes it an excellent coolant, which is why it is used in many cooling systems.

The specific heat capacity of water is 4.18 J/g·°C. When 50.0 grams of water are cooled from 70.0 oC to 60.0 oC, 2090 joules of heat energy are released. This result is consistent with the fact that water has a high specific heat capacity.

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Answer:

1

Explanation:

one possible way its just a theory of what the answer could be

Answer:

3-a factual statement

Explanation:

A hypothesis is a factual statement to explain a set of observations.