which of the following pairs of aqueous solutions will form a precipitate when mixed? a) nh4no3 k2co3 b) hg2(no3)2 nabr c) kcl li3po4 d) agc2h3o2 cu(no3)2 e) none of the above solution pairs will produce a precipitate.

A coyote is a species considered as a consumer in the food chain because they need to eat other live organisms to survive (Option 2).

The role of consumers in the food chain is to eat other organisms such as plants (in the case of herbivore consumers) or meat (in the case of carnivore consumers). Coyote is a carnivore consumer.

Therefore, with this data, we can see that the role of a consumer in the food chain is to consume (eat) other organisms.

Complete question:

Choose the correct option. A coyote is a ____ producer, consumer, decomposer.

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Formula units are there in 212 grams of MgCl₂ are 830.56

Formula is the empirical of any ionic or covalent network solid compound used as an independent entity for stoichiometric calculations and it is the lowest whole number ratio of ions represented in an ionic compound

Here given data is

MgCl₂ = 212 grams

1 mole of magnesium chloride has mass = 95.211 gram and contains 6.022×10²³formula units of magnesium chloride

Here 212 grams×6.022×10²³form unit of MgCl₂/95.211 gram = 830.56

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The presence of partial charges in a liquid enables the liquid to split the bonds of the salt when dissolved in it. On the other hand, in the absence of partial charges, the liquid won't be able to break bonds apart and dissolve salts in it.

How a liquid dissolves things?

In a liquid such as water the charges are arranged in a such a way that generates partial positive and negative sides on hydrogen and oxygen atoms giving rise to polarity.

So when a substance such as salt is dissolved in water, the partial positive charge attracts the negative side of the salt with a definite force while partial negative charge of liquid pulls the positive charges apart.

In general, the partial charges of the liquid pull apart the charges of the added substance which results in breaking their chemical bonds and dissolving them.

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Radium have a lower ionization energy than Barium because electrons are closer to the nucleus

What is ionization energy?

Ionization energy can be simply stated as a measurement of an atom's or ion's inclination to give up an electron or of how challenging it is to remove an electron from them. An electron is often lost when a chemical species is in its ground state.

The atom displays a smaller radius than anticipated and the s electrons are more challenging to expel because these electrons are located nearer the nucleus. The first ionization enthalpy of Radium is higher than that of Barium.

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The total pressure on Everest would be 34 kPa (or one-third of 102 kPa), and the partial pressure of oxygen would be 34 0.208 = 7.07 kPa.

Atmospheric pressure is the amount of force a given atmospheric column exerts relative to its size. At Mount Everest's summit (8848 m above sea level), the atmospheric pressure is 253 mmHg. The risk to a climber's life at high altitudes may come from the altitude itself. Since atmospheric pressure decreases with altitude, it is 33% lower at the summit of Everest than it is at sea level. Air pressure increases as air density decreases and air thickness increases. The density of air is influenced by a variety of factors. Most significantly, air becomes less dense as altitude rises, lowering atmospheric pressure.

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(a) The work done when the gas expands isothermally against a constant external pressure is 87.992 kJ

(b) The work that would be done if the same expansion occurred reversibly is 167.4 J

Given that the mass of methane m is = 4.5 gram = 0.0045 kg

Volume occupies [tex]V_{1}[/tex] = [tex]12.7dm^{3}[/tex]

And volume is increased by [tex]3.3dm^{3}[/tex]

So, the increased volume [tex]V_{2}[/tex] is

12.7 + 3.3 = 16 litres

Given temperature T is 310K

Pressure is given as 210 Torr = 26664.5 Pa

(a) Now, at the given pressure the work done is given by

W = P( [tex]V_{2}[/tex] - [tex]V_{1}[/tex])

W = 26664.5 (16 - 12.7)

W = 87992.85 J

W = 87.992 kJ

(b) At reversible process work done is given by

W = nRT㏑[tex]\frac{V2}{V1}[/tex]

We have the given mass = 4.5 gram

Molar mass of methane = 16

So number of moles is

n = Mass in gram / Molar Mass

n = 4.5 / 16

n = 0.28125

So, work done is

W = 0.28125 × 8.314 × nRT㏑[tex]\frac{16}{12.7}[/tex]

W = 167.4 J

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The percent ionization in the nitrous acid solution is 1.97% before, and 0.0999% after the addition of sodium nitrate, which lowered the ionization 19.7 times.

To calculate percent ionization, we need to use the expression for the acidity constant of nitrous acid:

[tex]Ka = \frac{[H^{+} ][NO_{2} ^{-} ]}{[HNO_{2} ]}[/tex]

Ka - acidity constant (for nitrous acid, 7.1 * 10⁻⁴)

[H⁺] - concentration of H⁺ ions

[NO₂⁻] - concentration of nitrite ions

[HNO₂] - concentration of unionized nitrous acid

[H⁺] = [NO₂⁻]

[HNO₂] = 1.80 M - X

[tex]7.1 * 10^{-4} = \frac{X^{2} }{1.80 - X}[/tex]

When we transform the equation above, we get a quadratic equation:

X² + 7.1 * 10⁻⁴X - 12.78 * 10⁻⁴ = 0

Once we solve for X, we get:

X = 0.0354 M

Because the concentration of H⁺ ions (X) is equal to the concentration of the ionized nitrous acid, the percent ionization will be:

%ion = 100% * X / 1.80 M

%ion = 100% * 0.0354 M / 1.80 M

%ion = 1.97%

The second calculation is actually easier because we can safely assume that, with added sodium nitrite, all nitrite ions come from the salt, and the amount coming from the acid is negligible. With that in mind, the expression for the acidity constant will look like this:

[tex]7.1 * 10^{-4} = \frac{X * 0.71 }{1.80 M - X}[/tex]

When rearranged, we get this equation:

0.71 * X = 12.78 * 10⁻⁴ M - 7.1 * 10⁻⁴X

0.71071 X = 12.78 * 10⁻⁴ M

X = 12.78 * 10⁻⁴ M / 0.71071

X = 0.001798 M

%ion = 100% * 0.001798 M / 1.80 M

%ion = 0.0999%

So the addition of sodium nitrite resulted in 1.97 / 0.0999 = 19.7 times lower ionization of the nitrous acid.

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Experimental pH indicates the pH obtained by directly measuring a specific sample with a pH meter.

The main difference between calculated and experimental pH is that calculated pH gives the pH obtained by solving the pH equation whereas experimental pH is measured directly with a pH meter. It is to indicate the value of a particular sample obtained.

Because microorganisms such as bacteria are sensitive to the concentration of hydrogen ions present in the environment, pH results will change over the course of an experiment. pH is affected by larger proteins, including enzymes. pH is a quantitative measure of the acidity or basicity of a solution while acidity is a qualitative measure of the acidic properties of a solution.

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The two isotopes that can be used for the process of dating are Potassium-41, Potassium-39.

The term radiometric dating has to do with the process by which the age of a rock can be discovered. We know that rocks that are around us have been around for very many years. As a matter of fact, there are some of the rocks that could be regarded as being as old as the earth could be in itself.

We have to note that one of things that could be regarded as important in the use of any isotope for dating is that isotope must have a long half life. The fact that the isotope has a long half life means that it is able to remain long enough for it to be used in the study of a substance.

We know that most of the rocks are composed of potassium as part of the components of the rock. In that case, if a dating technique would involve the potassium atom then it is likely to be a successful one as it were.

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Beryllium exists in Group 2 (Column 2) with the atomic number 4.

The atomic number of the next element in the group would be right below it, Magnesium (Mg). Magnesium contains the atomic number 12.

The charge number of an atomic nucleus is the chemical element's atomic number, also known as nuclear charge number. This is the number of protons present in the nucleus of each atom of that element, or the proton number, for conventional nuclei. Ordinary chemical elements can be uniquely identified by their atomic number.

The number of protons in an atom determines its atomic number, and isotopes have the same atomic number but different numbers of neutrons.

Beryllium exists in Group 2 (Column 2) with the atomic number 4.

The atomic number of the next element in the group would be right below it, Magnesium (Mg). Magnesium contains the atomic number 12.

The atomic number is the small number on the top left corner of the square of the element.

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0.50 mol of H₂ and 1.0 mol of O₂ have the same average molecular kinetic energy at standard temperature and pressure

Mass of H₂ and O₂ can be found by the formula given below;

m=n × M

mass of H₂= 0.50 × 2= 1g

mass of O₂=1.0 ×16= 16g

The formula to find average kinetic energy is as follows

K=[tex]\frac{3}{2}[/tex]K[tex]B}[/tex]T where K[tex]{B}[/tex]= Boltzmann constant

According to the conditions given above i.e standard temperature and pressure.

K∝T

So it is independent of the quantity of the sample i.e how much the amount of sample is present.  

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The partial pressure of Oxygen in the mixture is 280 mmHg.

The Sum of the partial pressure of elements in a solution equals the total pressure of the mixture as stated by Dalton's Law.

Total pressure = Partial pressure of Nitrogen + Partial pressure of Oxygen

P' = P₁ + P₂

The partial pressure is the pressure that each gas would exert if it alone occupied the volume of the mixture at the same temperature.

The system responds to changes in pressure, temperature, and chemical composition, phases may be created, eliminated, or altered in composition.

∴ 490 = 210 + P ₂

P₂ = 280 mm of Hg

Hence, the partial pressure of oxygen gas is 280 mm Hg.

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Answer: 0.01175

Explanation:

4Al + 2Pb(No3)2 → 4Al(No3) + Pb2

Hope this helps!

Solar energy is converted into chemical energy i.e. glucose with the help of photosynthesis.

Photosynthesis is the process in which light energy is converted to chemical energy in plant cells. In cellular respiration, plants use the chemical energy that is stored during the process of photosynthesis. Photosynthesis is a process in which plants convert energy from the sun into usable energy that is used by the cells in different activities. Plants use the light energy of the sun, carbon dioxide, and water to make glucose and oxygen. The glucose is stored in different parts of the plant while on the other hand, the oxygen is released in the atmosphere.

So we can conclude that with the help of the photosynthesis process, Solar energy is converted into chemical energy.

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The percent by mass concentration of calcium chloride is 0.20%

What is mass concentration?

Mass concentration, which is a quantity to measure this same concentration of a solute in the solution, is similar to molar concentration, molality, and mass fraction. It reveals how much of a solute there is in a certain volume of solution. Let's use coffee as an example to try to understand it. By combining coffee, sugar, and hot water, a straightforward instant coffee can be made. 10 g of coffee and 5 g of sugar are required to make a typical cup (250 mL) of coffee. Depending on individual preferences, the sum may change. We will need twice as much of the ingredients—20 g of caffeine and 10 g of sugar—to make two cups (500 mL).

When the mass of a solute as well as the mass of a solution are given, the mass percent is employed to express this same concentration of a solution:

Mass Percent=Mass of Solute/Mass of Solution×100%

% by mass = mass of substance/ mass of solution * 100 %

                   = 1.54/750*100 % = 0.20%

The percent by mass concentration of calcium chloride is 0.20%

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0.00925 moles OR 9.25103 moles of OH remain unreacted in the solution after the neutralization process is finished.

In a neutralization reaction, an acid and a base mix chemically to yield salt and water as the final products. During a neutralization process, H+ and OH- ions interact to produce water.

The balanced chemical equation is

H₂SO₄ + 2KOH → K₂SO₄ + 2H₂O

Now determine the number of moles

For H₂SO₄

Volume = 23.61 mL = 0.02361L

Concentration = 0.120M

From the formula,

Number of moles = Concentration × Volume

∴ Number of moles of H₂SO₄ = 0.120 × 0.02361

Number of moles of H₂SO₄ = 0.0028332 moles

For KOH

Volume =mL = 48.16ml = 0.04816 L

Concentration = 0.309 M

∴ Number of moles of KOH = 0.309 × 0.04816

Number of moles of KOH = 0.01488144 moles

From the equation of reaction,

0.0028332 moles of H₂SO₄ will neutralize 2× 0.0028332moles KOH

2× 0.0028332 = 0.0056664 moles

This means only 0.0056664 moles of KOH reacted

The amount of unreacted OH moles will now be discussed.

Number of unreacted OH moles equals the total number of OH moles at the start of the reaction. Quantity of OH that reacted in moles

∴ Number of moles of unreacted OH⁻ = 0.01488144 moles - 0.0056664 moles

Number of moles of unreacted OH⁻ ≅ 0.00925 moles OR 9.25×10⁻³ moles

Hence, the number of moles of OH⁻ that are unreacted in the solution after the neutralization is complete is 0.00925 moles OR moles 9.25×10⁻³.

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Answer:

yes, they are ph sensitive

Explanation:

Plants and animals are known to show growth sensitive to pH. pH is known as the hydrogen ion concentration of a solution. For example, plants are known to be growth sensitive to the pH of the soil. Plants need an optimum pH of soil for their growth, hence, showing growth dependence on soil pH.

Answer

a. C₂H₂O + 2O₂ → 2CO₂ + H₂O

b. 8 moles of O₂

c. 64 g of O₂

d. The grams of CO₂ produced is 262 g and the mass of H₂O produced is 53.6 g.

Explanation

a. The balanced chemical equation gasohol is a fuel containing liquid ethanol (C₂H₂O) that burns in oxygen gas to give carbon dioxide and water gases is:

b. The moles of O₂ needed to completely react with 4.0 moles of C₂H₂O?.

The mole ratio of O₂ to C₂H₂O in the balanced equation is 2:1.

Therefore, 4.0 moles of C₂H₂O will completely react with (2 x 4) = 8 moles of O₂.

c. The mass in grams of O₂ that is used up in the reaction if a car produces 88 g of CO₂.

The molar mass of CO₂ = 44.01 g/mol

The molar mass of O₂ = 31.999 g/mol

The mole ratio of O₂ to CO₂ is 2:2

This implies (2 mol x 31.999 g/mol) = 63.998 g of O₂ is used up to produce (2 mol x 44.01 g/mol) = 88.02 g of CO₂

Therefore x g of O₂ will be used up to produce 88 g of CO₂

That is;

Hence, the mass in grams of O₂ that is used up in the reaction if a car produces 88 g of CO₂ is 64 g.

d. The grams of CO₂ and H₂O that can be produced if 125 g of C₂H₂O were burnt.

1 mole of C₂H₂O = 42.04 g

1 mole of CO₂ = 44.01 g

1 mole of H₂O = 18.01 g

Mass of CO₂ produced:

From the balanced, the mole ratio of C₂H₂O to CO₂ is 1:2

The grams of CO₂ produced is 262 g.

Mass of H₂O produced:

From the balanced, the mole ratio of C₂H₂O to H₂O is 1:1

The mass of H₂O produced is 53.6 g

Two solutions are made by mixing sugar and enough water to make a 1 liter solution. 10% sugar has more solvent.

In chemistry, a solution is a homogeneous mixture of two or more compounds in their relative proportions that can be continually altered up to what is referred to as the limit of solubility. Although the word "solution" is frequently used to refer to the liquid state of matter, solutions of gases and solids are also possible. A solute is dissolved by a solvent (s), which is a substance (from the Latin solv, "loosen, untie, solve,") to produce a solution. The most common form of a solvent is a liquid, although other forms include solids, gases, and supercritical fluids. Depending on the temperature, a different amount of solute can dissolve in a given volume of solvent. Solvents are extensively utilized in paints, paint removers, inks, and dry cleaning.

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Answer:

the answer is C.Distilled or deionized water.

The student with the correct statement is Arlo.

First, we shall determine the mole of sulphur in the jar. This can be obtained as follow:

Mole = mass / molar

Mole of sulphur = 16 / 32

Mole of sulphur = 1/2 mole

Finally, we shall determine the number of atoms in the jar. This can be obotained as follow:

From Avogadro's hypothesis,

1 mole of sulphur = 6.02×10²³ atoms

Therefore,

1/2 mole of sulphur = 1/2 × 6.02×10²³ atoms

1/2 mole of sulphur = 1/2 × Avogadro's number

Thus, the number of sulphur atom is 1/2 times Avogadro's number

Therefore, Arlo is correct.

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When 20 grams of a salt is dissolved in 95 grams of water, the temperature of the solution decreases from 40oc to 0oc. 880 calories heat is absorbed, the Specific Heat of the solution is 1.1 Cal/goc.

delta t = T f - T i

          = 0 - 40

          = -40 degrees Celsius

c = 1.1 Cal/g degrees Celsius

m = 20 grams

heat absorbed (q) = mc(delta)t

                          q = 20 * 1.1 * -40 degrees Celsius

                           q = 880 Cal

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When GPR resin is setting, it gets hot. The type of reaction is this (exothermic or endothermic) is endothermic reaction. In terms of energy transfer energy is absorbed from its surrounding in form of heat.

Endothermic reaction occurs when heat is  absorbed by the system from surrounding. while Exothermic reaction occurs when heat is released by the system in surrounding. In endothermic reaction , the system absorbed the energy from its surrounding in the form of heat.

Thus, When GPR resin is setting, it gets hot. The type of reaction is this (exothermic or endothermic) is endothermic reaction. In terms of energy transfer energy is absorbed from its surrounding in form of heat.

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The energy that is going to release in Zn-sulfur reaction is 3168.92 kJ.

The chemical equation of the given Zn-sulfur reaction is :

Zn + S →Zn + 205.98 kJ

The molar mass of the zinc is 65 g.

1 mole is equivalent to 65 g of zinc which means the amount of energy released by 1.00 kg zinc is :

1 kg = 1000 g

Now,

205.98/65 g × 1000g

= 3168.92 kJ

The total energy released is 3168.92 kJ.

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Answer:

Explantion

Here, we want to get the number of moles in 60 g sample of NaCl

Mathematically, to get this, we have to divide the mass given by the molar mass of NaCl

Thenmolar mass of NaCl is 58.44 g/mol

Thus, we have the number of moles as:

The fusion of hydrogen nuclei into helium nuclei in the solar core is how the Sun obtains its energy. The proton-proton chain, a series of nuclear fusion processes, describes this hydrogen burning.

Protons, which are just single hydrogen atoms, are the starting point of this process inside the sun. Through a series of stages, these protons fuse together to form helium. This fusion process takes place in the sun's core, and the energy released as a result of transmutation maintains the sun's hot.

A deuterium (2H) nucleus is created from two protons in the first step of the hydrogen fusion process, along with an antielectron and a neutrino.

Four hydrogen protons and two electrons are used in the basic hydrogen fusion cycle, which results in the creation of a helium nucleus, two neutrinos, and six photons.

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