A 1.4 L flask contains 0.95 g O2 at a temperature of 18.3oC. The the pressure inside the flask is _____atm (round your answer to the thousandths place

First nations people along the west coast of British Columbia used smelting technology to create copper plaques is false.

Smelting process is the form of extractive metallurgy to produce a metal from its ore. it is the process of melting and separation of charges .  it is extensive energy process. Plaques are made by pouring molten metal in to a mold. and when it gets cools , it solidified into a copper solid plaque. first nation people use copper as hunting weapons, spear tools etc. copper is metal.

Thus, First nations people along the west coast of British Columbia used smelting technology to create copper plaques is false.

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Answer:

Accuracy and precision are both important concepts in measurement, but they refer to different aspects of the measurement process.Accuracy refers to how close a measured value is to the true or expected value. In other words, accuracy is a measure of how well a measurement reflects reality. A measurement can be accurate even if it is not precise, as long as it is close to the true value.Precision, on the other hand, refers to the level of consistency or reproducibility of a set of measurements. In other words, precision is a measure of how well a measurement can be replicated. A measurement can be precise even if it is not accurate, as long as the values are consistent and repeatable.To illustrate the difference between accuracy and precision, consider the example of a dartboard. If a person throws several darts and they all land in the same spot, that person has high precision. However, if the darts all land far away from the bullseye, they have low accuracy. If a person throws several darts and they are spread out across the board, that person has low precision. However, if the darts are all clustered around the bullseye, they have high accuracy.In summary, accuracy is a measure of how close a measurement is to the true value, while precision is a measure of how consistent or reproducible a set of measurements is.

Answer:

Chlorine is a chemical element with atomic number 17 which means there are 17 protons and 17 electrons in the atomic structure. The chemical symbol for Chlorine is Cl. Neutron Number and Mass Number of Chlorine Mass numbers of typical isotopes of Chlorine are 35; 37.

Explanation:

Answer:

The calculated mass of one atom of oxygen-18  is approximately  2.99×10⁻²³ grams

Explanation:

The given mass of an oxygen-18 atom = 18.0042 amu

The definition of the atomic mass unit is the mass equivalent to the mass of one twelfth the atomic mass of one atom of carbon-12. The atomic mass unit is used to express the mass of an isotope of an element

1 amu = 1.66 × 10⁻²⁴ grams

Therefore;

18.0042 amu = 18.0042 ×  1.66 × 10⁻²⁴ grams ≈ 2.99×10⁻²³ grams

The calculated mass of one atom of oxygen-18 ≈ 2.99×10⁻²³ grams

The atomic mass unit can be taken as the mass in grams of one mole of the substance

Therefore, the mass of one mole of the oxygen 18 atom = 18.0042 g

The correct answer is (D) Bohr. In 1913, Niels Bohr proposed the Bohr model of the atom, which introduced the idea that electrons occupy certain energy levels are located at specific distances from the nucleus of the atom.

Niels Bohr proposed the Bohr model of the atom, which introduced the idea that electrons occupy certain energy levels, or shells, that are located at specific distances from the nucleus of the atom. He proposed that electrons can only exist in these specific energy levels, and that they can transition between levels by absorbing or emitting energy in the form of photons. The Bohr model of the atom was significant because it provided a theoretical explanation for the atomic spectra that were observed in experiments, and it represented a significant advancement in our understanding of the structure of the atom. However, it was later refined with the development of quantum mechanics, which provided a more accurate description of atomic structure.

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Answer:

Bulb C

Explanation:

Bulb C because it is closes to the battery and because it's closest to the battery it means that, that specific bulb will be powered more defiantly and carry more electricity.

Answer:

C

Explanation

Bulb C because it is closes to the battery

Answer:

See Explanation

Explanation:

The formula of sodium sulphate is Na2SO4. The component atoms in the compound are; sodium, sulphur and oxygen.

The compound is ionic. it is composed of sodium ions and sulphate ions.

The molar mass of sodium sulphate = 142 g/mol

percentage by mass of sodium =  2* 23/142 * 100 = 32.39 %

percentage by mass of sulphur = 32/142 * 100 = 22.5%

percentage by mass of oxygen = 4 * 16/142 * 100 = 45.1 %

Answer:

A co-transported molecule travels down an electrochemical gradient in either direction.

The coupled transport allows a molecule to be transported against the electrochemical gradient as Co-transported molecules can move in either direction along an electrochemical gradient. This is further explained below.

Generally, coupled transport is simply defined as the simultaneous passage of two substances over a biological membrane.

In conclusion, Because molecules that are co-carried can travel in either way along an electrochemical gradient, linked transport enables molecules to be transported in the opposite direction of the electrochemical gradient.

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Answer: the place that i put the letters is how it should look also 75% of your peas are green

Explanation:

Answer:

A nuclear reaction releases more energy per gram and appears to violate the law of conservation of mass.

Explanation:

Answer:

A

Explanation:

Edge 2021

Answer:

Period

Explanation:

I believe your answer should be period.

I hope it helps! Sorry if it didn’t… Have a great day!

Layla~

Answer:

the year of cellphone users increases every year

Explanation:

i did the test

Answer:

Heat travels faster in solids.

Heat travels slower in gases.

Explanation:

The state of matter in which heat travels in fastest way is solid and in gaseous state heat travels in slowest way.

Heat transfer is a process in which heat can travel from one body to another body or from high temperature to low temperature.

In solid state heat will travel in the fastest way because molecules are arranged very close to each other and heat will travel through conduction process. And in gaseous state heat will travel with slowest way as molecules are arranged in very distance.

Hence in solid, heat travels in fastest way and in gases heat travels in slowest way.

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Answer:

The atomic mass number does not change because a beta particle has a much smaller mass than an atom. The atomic number goes up because a neutron has turned into an extra proton, however in beta decay a fast-moving electron is fired out of the nucleolus

Hope this helped!

Answer:

My best guess is c

Explanation:

Answer:

C for plato

Explanation:

The heat transferred when 4.5 grams of Carbon reacts with H2O is approximately 42.38 kJ. Therefore, the correct option is 42 kJ absorbed.

Option B.

Given reaction is as follows: C(s) + H2O(g) + 113 kJ → CO(g) + H2(g)To find the amount of heat transferred when 4.5 grams of Carbon reacts with H2O, we have to first find the amount of moles of Carbon present. The molar mass of Carbon is 12 g/mol. Therefore, the amount of moles of Carbon can be calculated as follows:mass of carbon/molar mass of carbon=4.5 g/12 g/mol=0.375 molNow, to find the amount of heat transferred, we use the equation, q = n∆Hwhere q is the heat transferred, n is the amount of moles of Carbon present, and ∆H is the enthalpy change for the given reaction. ∆H is given in the equation as 113 kJ.To find the sign of ∆H, we look at the reactants and products. In the given reaction, Carbon reacts with H2O to form CO and H2. Since Carbon and H2O are reactants and CO and H2 are products, this reaction is an endothermic reaction. Hence, the value of ∆H is positive.∆H = 113 kJ/molNow, substituting the values in the equation, q = n∆Hq = 0.375 mol × 113 kJ/molq = 42.38 kJ (approx)

Option B.

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The equation can be balanced using suitable integers multiplied either side and can be written as follows:

\(\rm Ca_{3} (PO_{4})_{2} + 4 H_{3}PO_{4} \rightarrow 3 Ca (H_{2}PO_{4})_{2}\)

Thus the coefficient of H₃PO₄ is 4.

A balanced chemical equation of a reaction represents all the reactants and products in the perfect stoichiometric ratios where, the number of each element have to be equal in both sides.

The given reaction is an example of combination reaction. The equation can be balanced by equating the number of calcium in the product side by multiplying with 3 and then making the phosphate group also balanced by multiplying by 4 with  H₃PO₄.

Thus, the balanced chemical equation written above contains 3 calcium on both side and equal number of phosphate group (6) as well as hydrogens on both side where, the coefficient of  H₃PO₄ is 4

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During the electrolysis of a Na2SO4 solution with a few drops of phenolphthalein, the solution turns pink around an electrode. This observation indicates that water is being oxidized at that electrode.

The pink color around the electrode indicates the presence of hydroxide ions (\(OH^-\)) produced by the reaction of water molecules with the electrons generated at the electrode. In this case, water is being oxidized, which means it loses electrons, at the anode (positive electrode) to form oxygen gas (\(O_2\)), hydrogen ions (\(H^+\)), and electrons (\(e^-\)).

The overall chemical reaction at the anode can be written as:

\(2H_2O(l) -> O_2(g) + 4H^+(aq) + 4e^-\)

However, The \(H^+\) ions produced in the reaction will react with the \(SO_4^2^-\) ions present in the solution to form sulfuric acid (\(H_2SO_4\)), which makes the solution acidic and turns the phenolphthalein pink. This observation indicates that water is being oxidized at that electrode.

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The ksp of caf2 if its molar solubility is 2.04 x 10-4 m is 3.40 x 10⁻¹¹.

Solubility is described because the maximum quantity of a substance with the purpose to dissolve in a given quantity of solvent at a distinct temperature. Solubility is a function property of a selected solute-solvent combination, and exclusive substances have greatly differing solubilities.

calculation:-

Caf₂ ----> Ca²⁺   + 2f⁻

                  s          2s

Ksp = [Ca²⁺] [f⁻]

ksp = [s][2s]²

      = 4s³

Given

S = 2.04 x 10⁻⁴

⇒ Ksp = 4( 2.04 x 10⁻⁴)²

⇒ Ksp = 4 ( 8.49 x 10⁻¹²

⇒ Ksp = 3.40 x 10⁻¹¹

Solubility is the capability of a substance, the solute, to form an answer with some other substance, the solvent. Insolubility is the other belonging, the inability of the solute to shape this kind of solution.

Solubility refers to the best quantity of solute that may dissolve in a regarded amount of solvent at a given temperature. In a solvent, an answer is a homogeneous aggregate of one or greater solutes.

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Answer:

Explanation:

V1/T1 =V2/T2    at constnant pressure

Answer:

c

Explanation:

The first two chemical equations are reversible while the other two are irreversible.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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Answer:

As water is boiled, kinetic energy causes the hydrogen bonds to break completely and allows water molecules to escape into the air as gas (steam or water vapor). When water freezes, water molecules form a crystalline structure maintained by hydrogen bonding.

Explanation:

The set of quantum numbers for an electron in a 7d {x²-y²} orbital would be:

n = 7, l = 2, m_l = ±2, m_s = ±1/2

The principal quantum number, n, describes the energy level of the electron, which in this case is 7 since the electron is in the seventh energy level. The angular momentum quantum number, l, describes the shape of the orbital, which for a d orbital can range from 0 to 2. The magnetic quantum number, m_l, describes the orientation of the orbital in space, which for a d orbital can range from -l to +l. Since the orbital in question is {x²-y²}, it has two lobes that lie along the x- and y-axes and two lobes that lie along the z-axis, which corresponds to m_l = ±2. Finally, the spin quantum number, m_s, describes the direction of the electron's spin, which can be either +1/2 or -1/2.

It's worth noting that electrons in the same orbital must have different spin quantum numbers, according to the Pauli exclusion principle. Therefore, the two electrons in the 7d {x²-y²} orbital would have opposite spin quantum numbers, i.e. one would have m_s = +1/2 and the other would have m_s = -1/2.

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During electrolysis, the product that we get at the cathode is the metal, for Ag, Ag is deposited at the cathode.

Changing a substance's chemical composition by passing an electric current through it is called electrolysis. When a substance loses or gains an electron, a chemical change has occurred (oxidation or reduction).

The procedure is performed in an electrolytic cell, a device made up of positive and negative electrodes that are held apart and submerged in a solution containing ions with opposite charges.

The substance that needs to be transformed can either be dissolved in the solution, form the electrode, or form the electrode itself.

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Main answer:ln(T2/T1) +ΔS°mix The change in entropy of the reaction (ΔS°) can be calculated by using the formula, ΔS°= ΔS°(products) - ΔS°(reactants).

Given; moles of hydrogen (H2)=72 moles of oxygen (O2)=44 moles of the mixture=n(H2) + n(O2)=72+44=116The initial temperature= 40°C = 313 KThe final temperature= 60°C = 333 KThe initial pressure= 2 barThe process is isobaric process where pressure is constant and therefore work done is zero.

From the ideal gas equation PV = nRT we can rearrange it to V = nRT/PThe volume of the mixture can be calculated as follows;V= nRT/P= (72 + 44) * 8.31 * 313 / (2 * 10^5)= 6.28 LThe final volume, V2 = 6.28LThe change in temperature is ΔT = 333 - 313 = 20 KThe change in entropy of the mixing process (ΔSmix) can be calculated using the formula;ΔSmix= -nR(xlnx + (1-x)ln(1-x))= -116*8.31[(72/116)ln(72/116)+(44/116)ln(44/116)]= 47.01 J/K.

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Methanol's combustion enthalpy can be calculated at -540 (kJ mol-1).

Methanol, the most basic form of alcohol (CH3OH), serves as the chemical basis for countless items used in daily life, such as paints, plastics, auto parts, and building supplies. Additionally, methanol is a renewable resource that powers fuel cells, boilers, cook stoves, ships, automobiles, trucks, and buses.

Energy required to dissociate the bonds connecting reactants

3 × 413 + 358 + 464 + 1.5 × 498 (kJ mol-1) / 2808 (kJ mol-1);

Total energy released when products form bonds

4 × 464 + 2 × 746 (kJ mol-1) / 3348 (kJ mol-1);

∆H = -540 (kJ mol-1).

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The complete question is -

Methanol is made in large quantities as it is used in the production of polymers and in fuels.

The enthalpy of combustion of methanol can be determined theoretically or experimentally.

CH₃OH(l) + 1 O₂(g) → CO₂(g) + 2H₂O(g)

Using the information from Table 10 of the Data Booklet, determine the theoretical enthalpy of combustion of methanol.

Chrysoberyl is Faceted to produce "cyclic twins" which is the correct option E.

Chrysoberyl is a beryllium aluminate mineral or gemstone with the chemical formula BeAl₂O₄. Chrysoberyl and beryl are two very distinct gemstones, despite the fact that their names are similar and they both contain beryllium. On the Mohs scale of mineral hardness, chrysoberyl, which ranks between corundum and topaz at 8.5, is the third-hardest naturally occurring gemstone that is often found.

Pegmatitic mechanisms result in the formation of chrysoberyl. Relatively low-density molten lava is created during melting in the Earth's crust and has the ability to ascend higher and reach the surface. Because water could not be integrated into the crystallisation of solid minerals, it grew increasingly concentrated in the molten rock as the primary magma body cooled.

As a result, the remaining magma is more abundant in water and uncommon elements that also do not fit into the crystal structures of the main minerals that form rocks. By lowering the temperature range before the magma solidifies fully, water allows the concentration of rare elements to advance to the point where they can create their own unique minerals.

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Complete question:

Chrysoberyl is

A light green-yellow form of Beryl

very common throughout the world

only formed in beryllium-poor environments

the 3rd hardest natural gemstone

Faceted to produce "cyclic twins"

Answer:

I would say B but you don't have to take my word for it

Answer:

D

Explanation:

Answer:

experiment can show the movement of pollutants through the groundwater!

Explanation:

Answer:

I see that the water is starting to get darker and darker which means it is getting dirtier the higher is goes up.  So that means that the soil and gravel will pollute the water with dirt, gravel, etc.

Explanation: Please give brainliest have a good day:)