How many moles of O2 are dissolved n 10.0 L of a 0.001 mol dm-3 solution?

Answer:

An atomic number of 94

Explanation:

Just took the practice

Answer:

approximately 251.55 grams of AuCl3 would contain 5.0 x 10^23 molecules.

A. They have performed an experiment once and reported their findings.

The net ionic equation for the reaction between potassium sulfide and magnesium iodide is S2- + Mg2+ -> MgS, as the potassium and iodide ions are spectator ions and do not participate in the reaction.

To determine the net ionic equation for the reaction between potassium sulfide (K2S) and magnesium iodide (MgI2), we first need to identify the ions present in each compound and then determine the products formed when they react.

Potassium sulfide (K2S) dissociates into two potassium ions (K+) and one sulfide ion (S2-):

K2S -> 2K+ + S2-

Magnesium iodide (MgI2) dissociates into one magnesium ion (Mg2+) and two iodide ions (I-):

MgI2 -> Mg2+ + 2I-

Now, we need to determine the possible products when these ions combine. Since potassium (K+) has a +1 charge and iodide (I-) has a -1 charge, they can combine to form potassium iodide (KI):

K+ + I- -> KI

Similarly, magnesium (Mg2+) and sulfide (S2-) can combine to form magnesium sulfide (MgS):

Mg2+ + S2- -> MgS

Now, we can write the complete ionic equation by representing all the ions present before and after the reaction:

2K+ + S2- + Mg2+ + 2I- -> 2KI + MgS

To obtain the net ionic equation, we remove the spectator ions, which are the ions that appear on both sides of the equation and do not participate in the actual reaction. In this case, the spectator ions are the potassium ions (K+) and the iodide ions (I-).

Thus, the net ionic equation for the reaction between potassium sulfide and magnesium iodide is:

S2- + Mg2+ -> MgS

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The amount of the F–20 that will remain after 44 s given the data from the question is 0.3125 g

n = t / t½

n = 44 / 11

n = 4

N = N₀ / 2ⁿ

N = 5 / 2⁴

N = 5 / 16

N = 0.3125 g

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The amount of energy that is required to change 20.0 g of an unknown substance from -15.0 °C to 7.0 °C is q = +49.65 kJ.

Energy is the ability to do tasks. It can exist in various forms, including potential, kinetic, thermal, electrical, chemical, and nuclear.

At -15°c, it will be solid, to increase the amount of heat to raise

temp from -15°C to 40°C.

(20.0) (3.3J/g°c) x 15°C) = 330 J.

At -10°C, it is in which phase transformation takes place from sold to wound.

ΔHfue = 0.945 J/gx 20g = 18.93.

After that, it will be in want and it will be in liquid form 40°C.

To 7°C, then.

922 m Cgas 47

=(20g) (1455/g°c) (17)

493005.

Total Energy = q1 + ΔHfus  + q2

47 = 7.0°C - 10°C) = 14°C -

2 330J18.95 + 49300J

q = 49648.9 3. 9

q = +49.65 KJ

Therefore, the amount of energy is q = +49.65 KJ.

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Answer:

To determine the change in mass of A over the given time period, we need to find the difference between the initial mass of A and the final mass of A.

From the given table, we can see that the initial mass of A at t = 0 (start time) is 12.4 g and the final mass of A at t = 60 minutes (end time) is 6.2 g.

Therefore, the change in mass of A over 60 minutes is:

Final mass of A - Initial mass of A

= 6.2 g - 12.4 g

= -6.2 g

The negative sign indicates that the mass of A decreased over time, which means that A underwent some kind of reaction or process that caused it to lose mass.

The change in mass of A over 60 minutes is -6.2 grams.

To determine the change in mass of A over 60 minutes, we need to compare the initial mass to the final mass.

From the given information, we can see that the mass of A decreases over time.

Let's calculate the change in mass.

Initial Mass of A: 12.4 g

Final Mass of A: 6.2 g

Change in Mass of A = Final Mass of A - Initial Mass of A

= 6.2 g - 12.4 g

= -6.2 g

The change in mass of A over 60 minutes is -6.2 grams.

Note that the negative sign indicates a decrease in mass.

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molar mass of empirical formula = (20 x 12.01 g/mol) + (24 x 1.01 g/mol) + (1 x 14.01 g/mol) = 324.44 g/mol ratio = 324.44 g/mol / 324 g/mol = 1.001. The molecular formula of quinine is C20H24N.

The active component of cinchona extracts, which have been used for this purpose since before 1633, is utilized as an antimalarial medication. Quinine has been utilized in conventional cold remedies for its use as a mild antipyretic and analgesic.

Plasmodium falciparum malaria is treated with quinine. Malaria is brought on by the parasite Plasmodium falciparum, which enters the body through the red blood cells. Quinine functions by either eliminating the parasite or halting its growth.

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No, alloy and gemstone are not the same type of solution.

An alloy is a mixture of two or more metals or a metal and another element. It is formed by combining different metallic elements to create a material with desired properties such as strength, durability, or resistance to corrosion. Examples of alloys include bronze (copper and tin), stainless steel (iron, chromium, and nickel), and brass (copper and zinc).

On the other hand, a gemstone is a mineral or a naturally occurring material that is cut and polished to be used in jewelry or decorative items. Gemstones are prized for their beauty, rarity, and often have unique optical properties such as color, clarity, and brilliance. Examples of gemstones include diamonds, rubies, emeralds, and sapphires.

While both alloys and gemstones can be materials used in various applications, they are fundamentally different in terms of their composition, formation, and purpose.

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Answer: No, alloy and gemstone are not the same type of solution. They are two different concepts related to materials.

Explanation:

Alloy: An alloy is a mixture of two or more elements, at least one of which is a metal. Alloys are created to enhance the properties of the constituent elements. By combining different metals, engineers can produce materials with specific characteristics such as increased strength, improved corrosion resistance, or better conductivity. Common examples of alloys include steel (a mixture of iron and carbon), brass (a combination of copper and zinc), and bronze (a blend of copper and tin).

Gemstone: A gemstone is a precious or semi-precious mineral, rock, or organic material that is cut and polished to be used in jewelry or ornamental objects. Gemstones are valued for their beauty, rarity, and sometimes metaphysical properties. Examples of gemstones include diamonds, rubies, emeralds, sapphires, amethysts, and many others. All are available on cabochonsforsale

While both alloys and gemstones involve mixing different materials, they serve very different purposes and have distinct characteristics. Alloys are primarily used to improve the properties of materials, while gemstones are valued for their aesthetic and decorative qualities.

The number of moles of cesium chloride produced 0.183 moles.

The number of moles of a substance can be calculated by dividing the mass of the substance by its molar mass.

According to this question, the chemical formula for cesium chloride is CsCl. A chemist measured the amount of cesium chloride produced during an experiment. She finds that 30.8 g of cesium chloride is produced.

The molar mass of Cesium chloride is 168.36 g/mol

Moles = 30.8g ÷ 168.36g/lol

moles = 0.183 moles

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The molecular formula for tripeptide Gly-Gly-His is C10H15N5O4. The structure is attached below in the picture. It has a role as a metabolite.

A tripeptide is created by combining three amino acids, and it is then joined by two or even three peptide bonds. The order of the individual amino acids that make up a peptide dictates how it functions, just like with proteins. The simplest tripeptide is glycine. The most significant tripeptide, according to scientific studies, is glutathione (-L-Glutamyl-L-cysteinylglycine), which has a number of functions in a wide range of life forms.

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Answer:

Weight

Explanation:

WHen talking about weight you’re referring to the force exerted to lift if, but when you’re talking about mass it’s just how much it weighs but not how much it takes to lift it.

Answer:

Br-CH2-CH(CH3)2-C(Cl)H-CH(CH3)2-CHO

Explanation:

The molecule has a total of 14 carbon atoms, 13 hydrogen atoms, and 1 bromine atom. The carbon atoms are arranged in a chain with a methyl group attached to the second carbon atom, a chlorine atom attached to the third carbon atom, and two methyl groups attached to the fourth carbon atom. The fifth carbon atom has a carbonyl group attached to it.

The molecule is an aldehyde, which means that it has a carbonyl group (C=O) at the end of the chain. The carbonyl group is polar, and the oxygen atom has a partial negative charge. The hydrogen atom has a partial positive charge. This polarity makes the aldehyde group susceptible to nucleophilic attack.

The bromine and chlorine atoms are both electrophilic, which means that they have a partial positive charge. This makes them susceptible to nucleophilic attack.

The methyl groups are non-polar and do not have any significant reactivity.

The molecule is a chiral molecule, which means that it has a mirror image that is not superimposable on itself. This is because the carbon atom with the carbonyl group is attached to four different groups.

The molecule is a liquid at room temperature and has a strong odor. It is used in a variety of products, including perfumes, flavorings, and plastics.

Explanation:

Then there is no net charge separation. a BH3 b CHCl3 c C2H2 d NH3. Optionally the ... Oxygen O2 c. ... BH3 2. Com Bh3 Polar Or Nonpolar In the case of non polar molecules dispersion forces or London forces are present between them.

The polar molecules is NO.

A polar molecule is one that has one end that is slightly positive and the other end that is slightly negative. Ionic or polar covalent bonds can form in polar molecule. A dipole is a molecule that has two poles. The dipole moment is the outcome of measuring the amount of polarity in a molecule.

NO molecule, In the periodic table, nitrogen is to the right of oxygen. Nitrogen has a lower electronegative potential than oxygen. All N-O bonds are polar, with the oxygen atom having a higher electron density. The uneven distribution of electrons in the NO molecule is quite minor. When a molecule is non-polar, the electrons are shared evenly, resulting in a non-polar bond, or the polar bonds are symmetric. So, oxygen, nitrogen and boron trihydride molecules are non-polar molecule.

Hence the correct option is D.

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Answer:

true

Explanation:

Fossil fuels are essential part of the power generation in the world. They are easily combustible and more reliable and cheaper. However, the burning of fossil fuels releases toxic gases  to the environment.

Fossil fuels are fuel generated from the decomposition materials. Petroleum, coal, natural gas  etc. are fossil fuels which are excavating from the earth.

Fossil fuels are non-renewable sources of energy. Hence, as the existing fossil sources are exhausted no more fossil fuel can be made. It is cheaper, reliable and easy to use.

However, the toxic hydrocarbon gases released from the burning of fossil fuels make the environment polluted. Therefore, overuse of fossil fuel definitely rise the atmospheric pollution.

Its use over the next 50 years, will increase the global warming and more of it will be exhausted.

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The distance from base to another is 127 feet or 3 3/8 inches.

Base paths/distance

The dimensions of infield shall be a 90-foot square. When the location of home base is determined, with a steel tape the dimensions are found to be  of 127 feet, 3 3/8 inches in desired direction to establish second base. The distance between first base and third base of the home is 127 feet, 3 3/8 inches.

An intentional walk occurs when the defending team chooses to walk a batter on purpose, putting him on first base instead of letting him try to hit.

Hence, distance from one base to another is 127 feet or 3 3/8 inches.

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Answer:

d.All of the above

Explanation:

They can do all of the above

The correct Lewis structure for the K+ ion is shown below:

Lewis structures are described diagrams that show the bonding between atoms of a molecule, as well as the lone pairs of electrons that may exist in the molecule.

The Lewis dot structure of an element is the structure that shows the number of valence electrons. As an example, in the case of  lithium ion, there will be no dots in its structure because the electron in its valence shell is removed from its system.

We know that potassium has only 1 electron in its valence shell and if it is ionized, only 1 electron will be removed which is why there is no dot in its structure.

There are a number of steps to write the Lewis structure and they include:

Step 1: Determine the total number of valence electrons in the element.

Step 2: Write the skeleton structure of the molecule.

Step 3: Use two valence electrons to form each bond in the skeleton structure.

Step 4: Try to satisfy the octets of the atoms by distributing the remaining valence electrons as nonbonding electrons.

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The sum of the coefficients for all reactants and products is: 12.

Here, we first need to balance the equation of the reaction between Fe2S3(s) and H+.

The sum of the coefficients for all reactants and products is therefore;

Sum = 1 + 6 + 3 + 2.

Sum of coefficients = 12

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Answer:

CnH2n

Explanation:

Alkenes are either branched or unbranched hydrocarbons with at least one carbon–carbon double bond (CC) and have a general formula of CnH2n.

Answer:

The volume of the gas sample at standard pressure is 819.5ml

Explanation:

Solution Given:

let volume be V and temperature be T and pressure be P.

\( V_1=250ml\)

\( V_2=?\)

\( P_{total}=735 mmhg\)

1 torr= 1 mmhg

42.2 torr=42.2 mmhg

so,

\( P_{water}=42.2mmhg\)

\( T_1=35°C=35+273=308 K\)

Now

firstly we need to find the pressure due to gas along by subtracting the vapor pressure of water.

\( P_{gas}=P_{total}-P_{water} \)

=735-42.2=692.8 mmhg

Now

By using combined gas law equation:

\(\frac{P_1*V_1}{T_1} =\frac{P_2*V_2}{T_2}\)

\(V_2=\frac{P_1*}{P_2}*\frac{T_2}{T_1} *V_1\)

\(V_2=\frac{P_gas}{P_2}*\frac{T_2}{T_1} *V_1\)

Here \(P_2 \:and\: T_2\) are standard pressure and temperature respectively.

we have

\(P_2=750mmhg \:and\: T_2=273K\)

Substituting value, we get

\(V_2=\frac{692.8}{750}*\frac{273}{308} *250\)

\(V_2= 819.51 ml\)

Answer:

If they all had the same eye color it would probably be hazel, but If they did not then it would either be blue or brown.

Explanation:

Hope this helps

Answer:

Red

Explanation:

Lime Juice is acidic which means it would turn the blue litmus paper red

Answer:

red, Lime juice is acidic in nature so it can turn blue litmus paper to red while the alkaline solution can turn the red litmus paper blue.

Explanation:

hope this helps

Answer:

Volume = 3.4 L

Explanation:

In order to calculate the volume of CO₂ produced when 15.2 g of CaCO₃ is heated, we need to first write out the balanced equation of the thermal decomposition of CaCO₃:

CaCO₃ (s) + [Heat] ⇒ CaO (s) + CO₂ (g)

Now, let's calculate the number of moles in 15.2 g CaCO₃:

mole no. = \(\mathrm{\frac{mass}{molar \ mass}}\)

                 = \(\frac{15.2}{40.1 + 12 + (16 \times 3)}\)

                 = 0.1518 moles

From the balanced equation above, we can see that the stoichiometric molar ratios of CaCO₃ and CO₂ are equal. Therefore, the number of moles of CO₂ produced is also 0.1518 moles.

Hence, from the formula for the number of moles of a gas, we can calculate the volume of  CO₂:

mole no. = \(\mathrm{\frac{Volume \ in \ L}{22.4}}\)

⇒ \(0.1518 = \mathrm{\frac{Volume}{22.4}}\)

⇒ Volume = 0.1518 × 22.4

                 = 3.4 L

Therefore, if 15.2 g of CaCO₃ is heated, 3.4 L of CO₂ is produced at STP.

Answer:

Valence Electrons

Explanation: