a scientist begins this experiment with 3 m a(g) and 3 m b(g). after running the experiment, she notices the concentration of a(g) is 0.75 m. what are the concentrations of the other two components?

Answer:4.5 ×10^22)

Explanation:

no. of particles =no. of mole×avogadro's number of particles no. of particles =0.75×6.02×10^23 no. of particles =4.5 ×10^22

Answer:

LOL ked e e. E e s e

Explanation:

This is my account

A fuel rich flame in atomic absorption spectroscopy would be preferred for refractory elements.

In atomic absorption spectroscopy, a fuel-rich flame refers to a flame that contains an excess amount of fuel compared to the stoichiometric ratio. This excess fuel creates a reducing environment where the concentration of metal oxides is decreased. Therefore, option (a) is not correct as a fuel-rich flame does not increase the concentration of metal oxides.

When it comes to the temperature of the flame, a fuel-rich flame tends to be cooler compared to a lean flame. The excess fuel acts as a heat sink, absorbing a portion of the heat energy from the flame. Consequently, option (b) is incorrect as a fuel-rich flame is not hotter than a lean flame.

Refractory elements are those that have high melting points and are difficult to vaporize. These elements require a higher temperature to reach their vaporization temperature and be detected in atomic absorption spectroscopy. A fuel-rich flame, despite being cooler overall, provides a localized hotter zone near the burner head due to incomplete combustion. This region of higher temperature is more favorable for vaporizing and atomizing refractory elements, making option (c) the correct answer.

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Answer:first one is chemical change and the second one is chemical reaction that sh be right.

Explanation:

Assuming no other unlisted ions are present in the water, the estimated concentration of  \(Na^+\) (in mg/L as  \(Na^+\)) is 21.2 mg/L.

Using an anion-cation balance, we may estimate the concentration of Na+ (in mg/L as Na+) by ensuring that the total positive charge from cations matches the total negative charge from anions.

The total positive charge from cations = (\(Ca^{+2} + M^g{+2} + Na^+ + K^+\))

The total negative charge from anions = (\(HCO^{3-} + SO_4^{2-} + Cl^-\))

Total positive charge = (40.0 + 10.0 + Na+ + 7.0)

Total negative charge = (67.2 + 11.0)

Total positive charge = Total negative charge

(40.0 + 10.0 + \(Na^+\) + 7.0) = (67.2 + 11.0)

Simplifying the equation:

57.0 + Na+ = 78.2

Subtracting 57.0 from both sides:

Na+ = 78.2 - 57.0

Na+ = 21.2 mg/L

Therefore, the estimated concentration of  \(Na^+\) (in mg/L as  \(Na^+\)) is 21.2 mg/L.

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Your question seems incomplete, the probable complete question is:

2. A sample of water has the following concentrations of ions (and pH = 7.0):

cations mg/L

anions mg/L

Ca+2

40.0

Mg+2

10.0

Na+

?

K+

7.0

HCO3 110.0

SO42-

67.2

Cl-

11.0

Assuming no other constituents are missing, use an anion-cation balance to estimate the concentration of Na* (in mg/L as Na*)? Remember that the balance cannot be in mg/L.

heterogeneous, because it does not have a uniform texture

hope That helps

Answer:

Heterogenous, I just took the quiz

Explanation:

Answer:

It's used to make paper.

Explanation:

Plato answer.

Answer:

Negative, because the potential energy of the reactants is higher than the potential energy of the products

Explanation:

Exothermic reaction is a reaction in which heat is released to surrounding. This is due to the fact that the heat content of the reactant is higher than the heat content of product thus producing a negative enthalpy change (ΔH) i.e

Enthalpy change = Heat of product – Heat of reactant

ΔH = Hp – Hr = negative

Considering the options given in the question above, the correct answer is:

Negative, because the potential energy of the reactants is higher than the potential energy of the products

When you get into a car that has been sitting in the sun for a while, there are several noticeable things that may occur. Here are some of the common observations:

1. Heat: One of the first things you'll notice is the intense heat inside the car. This is because the sun's rays have been absorbed by the car's exterior and trapped inside, creating a greenhouse effect. The temperature inside the car can become significantly higher than the temperature outside.

2. Hot Surfaces: The surfaces inside the car, such as the seats, dashboard, steering wheel, and metal parts, can become extremely hot to the touch. This is due to the absorption of heat from the sun. It's important to be cautious and avoid direct contact with these hot surfaces to prevent burns or discomfort.

3. Odor: The interior of the car may have a distinct smell when it has been sitting in the sun for a while. This is often referred to as the "hot car smell." It is caused by the combination of materials, such as upholstery, plastic, and carpet, heating up and emitting a specific odor.

4. Fading or Discoloration: Prolonged exposure to sunlight can cause fading or discoloration of materials inside the car. For example, the upholstery, dashboard, and other surfaces may gradually lose their original color and become faded or discolored over time.

5. Glare: When you first enter a car that has been sitting in the sun, you may notice a strong glare from the sunlight reflecting off the windshield and other glass surfaces. This glare can make it difficult to see clearly and may require the use of sunglasses or adjusting the sun visors to minimize the brightness.

It's important to note that these observations may vary depending on factors such as the intensity of the sunlight, the duration the car has been in the sun, and the materials used in the car's interior. Regular maintenance and taking precautions, such as using sunshades or parking in shaded areas, can help minimize some of these effects.

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Human activities that disrupt the carbon cycle include the burning of fossil fuels. The statement that best summarizes the disruption of the carbon cycle due to the burning of fossil fuels is: b) Burning fossil fuels adds carbon compounds to all Earth systems.

When fossil fuels, such as coal, oil, and natural gas, are burned, carbon that has been stored in these fuels for millions of years is released into the atmosphere as carbon dioxide and other greenhouse gases. This process significantly increases the amount of carbon compounds in Earth’s systems, including the atmosphere.

The burning of fossil fuels contributes to the increase in atmospheric CO2 levels, which is a major driver of anthropogenic climate change. The additional carbon compounds released from burning fossil fuels disrupt the natural balance of the carbon cycle by adding more carbon to the atmosphere than can be naturally absorbed by Earth’s systems. This leads to an accumulation of greenhouse gases and contributes to global warming and associated climate impacts. While other statements may partially describe the effects of burning fossil fuels on the carbon cycle, option b provides the most accurate and comprehensive summary of the disruption caused by this activity.

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Answer:

The ability of chlorophyl to convert light energy to chemical energy through photosynthesis supports that energy can not be created by the plant (which needed an energy input) and cannot be destroyed (because the plant created glucose which is converted again by consumers to ATP, a different type of chemical energy.)

If 0. 700 moles Ag is reacted with 10. 0 g S. The limiting reactant is Sulphur.

To know the limiting reactant first we should calculate the moles of each reactant.

Moles = Mass/ Mass molar

Moles S = 10 gram / 32 g/ mole

Moles S = 0.3125 moles

the balance reaction will be

2 Ag + s ⇒ Ag₂S

According to the stoichiometry from the reaction 1 moles of sulphur need to react with 2 moles of Ag to produce Ag₂S

Thus 0.3125 moles of S will require= 2/1 x0.3125 = 0.625 moles Ag

so, the Ag excess and the limiting reactant will be Sulphur.

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Mixture: A combination of two or more substances that are physically intermingled. Can be separated by physical methods.

Compound: A substance composed of two or more elements chemically bonded together. Can only be separated by chemical means.

Classification:

(i) Limestone - Mixture

(ix) Clay - Mixture

(ii) Diamond - Element

(x) Urea - Compound

(iii) Sand - Mixture

(xi) Antimony - Element

(iv) Soil - Mixture

(xii) Soap - Compound

(v) Urine - Mixture

(xiii) Milk - Mixture

(vi) Bronze - Mixture

(xiv) Air - Mixture

(vii) Sugar - Compound

(xv) Neon - Element

(viii) Gold - Element

(xvi) Iron - Element

Differences between mixtures and compounds:

Composition: Mixtures have variable compositions, meaning the ratio of substances can vary. Compounds have a fixed composition with a specific ratio of elements.

Separation: Mixtures can be separated into their components using physical methods. Compounds can only be separated into elements through chemical reactions.

Properties: Mixtures exhibit the properties of their individual components and can have varying physical properties throughout. Compounds have unique properties different from the elements they are composed of.

Classification of substances:

(i) Limestone: Mixture (contains minerals and impurities)

(ii) Diamond: Element (composed of carbon atoms)

(iii) Sand: Mixture (combination of mineral particles)

(iv) Soil: Mixture (combination of organic matter, minerals, water, and air)

(v) Urine: Mixture (contains various dissolved substances)

(vi) Bronze: Mixture (alloy of copper and tin)

(vii) Sugar: Compound (composed of carbon, hydrogen, and oxygen)

(viii) Gold: Element

(ix) Clay: Mixture (combination of minerals and organic matter)

(x) Urea: Compound (composed of carbon, hydrogen, nitrogen, and oxygen)

(xi) Antimony: Element

(xii) Soap: Compound (formed by the reaction of fatty acids with an alkali)

(xiii) Milk: Mixture (contains water, proteins, fats, sugars, and minerals)

(xiv) Air: Mixture (combination of gases like nitrogen, oxygen, carbon dioxide, etc.)

(xv) Neon: Element

(xvi) Iron: Element

It's important to note that some substances listed may have impurities or variations in composition, which can affect their classification.

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• given that volume = 230ml ,therefore mass of water = 230g

• ∆T = Tfinal-Tinitial =30.5-22.9 = 7.6°C

• Specific heat capacity of water , C= 4.184J/°C*g

• Therefore , q = mass* C * ∆T

= 230 * 4.184 * 7.6

=7313.6 J /1000

q= 7.314KJ

• given : mass of methanol burned = Mass F-Mass initial

=(2.51-1.65) = 0.86 g

• So ,moles of methanol , n = mass methanol/Mol. mass methanol

= 0.86g/32.04g/mol

=0.027 moles

• Finally , ∆H = q/n

= 7.314KJ / 0.027mol

=270.85KJ/mol

• However, this is an exorthemic reaction, heat is lost through combustion, our molar enthalpy should be negative.

Answer:

This is a mixture.

Explanation:

While you can no longer see the salt when it's dissolved, it's still there! It's just in tiny, tiny, invisible to the eye molecules. It's now a mixture of H20 molecules and NaCl molecules in a solution :)

The water doesn't bond to the salt, so it's not a compound.

It's not just one element, it's a mixture of many!

It's not a pure substance since it's NaCl AND H2O.

Answer:  Sufficient volume of air is present in lump of cotton wool. then dipped in water, this air goes out due to which the cotton lump shrunk.

yes

Answer:

I think 1.3 moles correct me if I'm wrong

Explanation:

Answer:

wavelength

Explanation:

Answer: 2,090J

The equation to find the specific heat is determined by the equation q = mcΔT, where q = total heat, m=mass, c = specific heat, and ∆T change in temperature.

Recall that the specific heat capacity for water is 4.18J/gºC

So, plug this along with your specific values into the equation.

q = 100g * (4.18J/gºC) * (20.0ºC-15.0ºC)
q = 2090J

By using the ideal gas law to get volume we have"

Where v is volume, T is temperatute, n is number of moles, R is the molar gas constant and P is pressure. At STP P= 101,325 Pa, T= 273.15 K and R= 8.314 J/mol K

We must first convert mass to moles:

By substituting this value into the ideal gas law we have:

1.9502e-6L of H2 gas reacted at STP

We can use the relationship between the pH, pOH, and Kb of a weak base:

Kb = (1.0 x 10^-14) / (OH^-)^2

First, we need to find the pOH of the solution, which is:

pOH = 14.00 - pH = 14.00 - 9.42 = 4.58

Next, we can find the concentration of hydroxide ions in the solution using the equation for the dissociation of water:

Kw = [H+][OH-] = 1.0 x 10^-14

[OH-] = Kw / [H+] = 1.0 x 10^-14 / 10^-9.42 = 3.98 x 10^-6 M

Now we can substitute these values into the Kb equation to solve for Kb:

Kb = (1.0 x 10^-14) / (3.98 x 10^-6)^2 = 6.29 x 10^-10

Therefore, the Kb of the unknown weak base is 6.29 x 10^-10.

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True. An alloy is a solid solution consisting of two or more metallic elements, or a metallic element and a non-metallic element.

The properties of an alloy are usually different from those of its constituent elements. The reason for this is that the atoms of different elements in an alloy interact with each other differently than they would if they were in their pure elemental form. This interaction can lead to changes in the electronic and crystal structure of the alloy, which in turn can affect its physical and chemical properties. Some common examples of alloys include brass (copper and zinc), stainless steel (iron, chromium, and nickel), and bronze (copper and tin).

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Complete question:

An alloy is a mixture of elements that has metallic properties. True or False

58.5 grams of NaCl is dissolved in 0.5 liters of water, then the molarity of the solution is 2M.

Molarity of any solution is define as the number of moles of solute present in per liter of solution and it is represented as:

M = n/V, where

V = volume of solution = 0.5 L

n is moles and will be calculated as:

n = W/M, where

W = given mass of NaCl = 58.5g

M = molar mass of NaCl = 58.44 g/mol

n = 58.5/58.44 = 1 mole

Molarity will be represented as:

M = 1/0.5 = 2 M

Hence required molarity of NaCl is 2M.

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Since the water increased by 7 degrees for the peanut and 3 degrees for the chip, the conclusion would be that the peanut has more energy than the chip.

Calorimetry is the science of measuring the quantity of energy, usually in the form of heat, that is released during a reaction.

In this case, the energy released by the peanut and the chip were measured using calorimetry. The energy released was captured by the water and helps raise the temperature of the water.

The more energy released by the substances, the more the temperature of the water is raised.

Thus, since the peanut raised the temperature of the water by 7 degrees while the chip was only able to raise it by just 3 degrees, one can effectively conclude that the peanut has more energy than the chip.

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answer:

the reason is to ensure more solute is dissolving as it cools down. it is important to do it slowly because water will be sucked into buchner flask by a partial vaccum through the rubber tubing and be able to arrange molecules.

Answer: The correct answer is:

a. stays the same.

Explanation:

When a chlorine atom is reduced, it gains one or more electrons, resulting in the formation of a chloride ion (Cl⁻). The reduction process does not involve any changes in the number of protons in the nucleus of the chlorine atom. Protons are positively charged subatomic particles that determine the identity of an element, and they remain unchanged during a reduction reaction. Therefore, the number of protons in the nucleus of a chlorine atom stays the same during reduction.

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The correct answer is:

a. stays the same.

When a chlorine atom is reduced, it gains one or more electrons, resulting in the formation of a chloride ion (Cl⁻). The reduction process does not involve any changes in the number of protons in the nucleus of the chlorine atom. Protons are positively charged subatomic particles that determine the identity of an element, and they remain unchanged during a reduction reaction. Therefore, the number of protons in the nucleus of a chlorine atom stays the same during reduction.

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Rank from highest to lowest boiling point:

Hydrocarbons can be classified into several categories based on their molecular structure, including alkanes, alkenes, alkynes, and aromatic compounds. Alkanes are simple hydrocarbons with single bonds between all carbon atoms, alkenes contain at least one carbon-carbon double bond, alkynes contain at least one carbon-carbon triple bond, and aromatic compounds contain a ring of alternating single and double bonds known as an aromatic ring.

Rank from highest to lowest boiling point:

Paraffin, C25H52

Hexadecane, C16H34

2,2,4-trimethylpentane, C8H18

Octane, C8H18

Propane, C2H8

They form the building blocks of many other organic compounds and play a crucial role in many natural and industrial processes.

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95 marks in 100 means you scored 95 % in homework.  Similarly 83% in labs and 77% in exams. Thus the weighted average will be 85 %.

Average of a set of values is their sum divided by their number. The average of a set with even number of values, will be their sum divided by number where the average comes in a range of the set of values.

Average of odd number of values will be the exact middle value of the set.

Given that marks in homework out of 100 = 95

labs = 83

exams = 77.

Thus, average of your marks percentage = (77 + 83 + 95)/3

                                                                     = 85%.

Therefore, the average percentage of the marks is 85%.

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Answer:

Yes

Explanation: