Question 6
To what temperature must 15 L of oxygen gas at -30°C be heated at 1 atm pressure in order to occupy a
volume of 23 L, assuming that the pressure increases by 58 mm Hg?
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Question 7
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Answer:

Solid piece of ice.

Explanation:

Solid piece of ice can easily melt due to heat radiation

170.21 cm³  volume would the butane gas sample occupy at a pressure of 2.35 atm.

When the temperature and quantity of the gas are held constant, the volume of a gas is inversely proportional to its pressure. This implies that when a gas's pressure rises, so will its volume, and the opposite is also true. Boyle's law is this. To make predictions in response to a change in either pressure or volume, use the following formula:

P₁V₁ = P₂V₂

Initial pressure, P1, is equal to 760 torr at 1 atm.

400 cm3 is the initial volume (V1).

P2 = 3 atm final pressure

Final volume equals (V2 = L)

V₂ = P₁V₁/P₂

V₂ = (1 atm × 400 cm³)/2.35 atm = 170.21 cm³

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The volume of butane gas is equal to 63.83 mL if the butane gas sample is held at a pressure of 2.35 atm. N-butane or normal butane are other names for butane.

With respect to a set quantity of gas and a constant temperature, the ideal gas equation states that PV = nRT = constant.

Therefore, for two distinct states of an ideal gas, P1V1 = P2V2 = constant.

V2 = P1V1/P2 after rearranging the equation above.

Take P1 equal to 1 atm and V1 equal to 150 mL.

P2 = 2.350 atm as well

When these numbers are substituted in the equation above, V2 = (1 atm 150 mL)/2.350 atm = 63.83 mL is the result.

So, 63.83 mL is the amount of butane gas.

The manufacturing of gasoline, lighter fuel, and cigarette lighters are all common uses for butane gas. Butane has the chemical formula C4H10.

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Sulfur hexafluoride is a light yellowish-green gas with HBr. Whether Cl2 is polar or not may be a point of contention for many pupils. SF6< HBr<Cl2<CO in order of increasing root-mean-square velocity at 50.

It is a gas that is tasteless, odourless, inflammable, and non-toxic. Six fluorine atoms are joined to a central sulphur atom in Sulfur hexafluoride, which has an octahedral structure. Due to the fact that bromine is a member of the halogen family, hydrogen bromide, abbreviated as HBr, is a hydrogen halide chemical. Although quite caustic and hazardous, this chemical has a variety of uses. In both organic and inorganic bromine compounds, it is employed to produce them. Chlorine is a substance that has the chemical formula Cl2. It is regarded as being the second-lightest halogen. It is a light yellowish-green gas that exists at room temperature.

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H3BNH3(s) - NH3(g) + BH3 is the correct option

The standard enthalpy of production is the enthalpy change that occurs when 1 mole of a substance is made up of its constituent elements in their standard states. In its natural condition, a pure element has a standard enthalpy of production of zero.

The physical states of the reactants and products (gas, liquid, solid, or solution), the pressure of any gases present, and the reaction temperature all affect how much hydrogen (H) is created during a reaction.

The change in a system's enthalpy that happens when one mole of a substance burns completely in oxygen or air at a certain temperature is known as the enthalpy of combustion.

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A summary of the C4 plants is given below:

The Hatch-Slack pathway, also known as C4 carbon fixation, is one of three recognized photosynthetic carbon fixation pathways in plants.

The names are a result of Marshall Davidson Hatch and Charles Roger Slack's discovery in the 1960s that some plants, when given 14CO2, integrate the 14C label into four-carbon molecules first.

Corn, sorghum, sugarcane, millet, and switchgrass are examples of C4 plants. C3 plants are often more prolific and efficient at photosynthesizing in cooler conditions because C4 morphological and biochemical adaptations demand more energy and resources from the plant.

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Water and sodium metal react violently to form sodium hydroxide and hydrogen gas. Both hydrogen gas, solid metal itself may spontaneously ignite due to the exothermic heat produced by this reaction.

Sodium hydroxide is also known as caustic soda and lye. It is a common component of cleansers and soaps. At room temperature, sodium hydroxide is essentially a simple white, odorless solid. Hydroxide is a liquid that has no color or smell. Water can ignite explosive reactions when combined with appropriate acids.

Manufacturers use the chemical sodium hydroxide to create items including soap, rayon, newspaper, explosives, pigments, and crude oil. Hydrochloric acid is also used for cleaning and preparing metal, coating with oxide, electroplating, and electromechanical recovery.

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In the provided question, [tex]-1.383 \times 10^{-11}[/tex] Joules is the equivalent energy of the mass defect of an atom of [tex]\rm _8 ^{18}O[/tex] .

The mass defect is the difference between the mass of an atom's nucleus and the sum of the masses of its individual protons and neutrons.

The mass of an atom of [tex]\rm _8 ^{18}O[/tex] is 17.99916 u. The sum of the masses of its eight protons (1.00728 u each) and ten neutrons (1.00867 u each) is 16.99776 u. Therefore, the mass defect is:

Δm = (mass of nucleus) - (sum of masses of protons and neutrons)

Δm = 17.99916 u - 16.99776 u

Δm = 0.0014 u

The equivalent energy ([tex]\rm E_b[/tex]) of the mass defect can be calculated using Einstein's famous equation:

[tex]\rm E=mc^2[/tex], where E is energy, m is mass, and c is the speed of light.

[tex]\rm E_b[/tex] = Δm [tex]\rm \times c^2[/tex]

where c is the speed of light, which is approximately [tex]3.00 \times 10^8[/tex] m/s.

Plugging in the values, we get:

[tex]\rm E_b[/tex]= [tex]\rm (0.0014 \ u) \times (1.66 \times 10^{-27 }\ kg/u) \times (3.00 \times 10^8 \ m/s)^2[/tex]

[tex]\rm E_b = -1.383\times 10^{-11} J[/tex]

Therefore, the equivalent energy ([tex]\rm E_b[/tex]) of the mass defect of an atom of  [tex]\rm _8 ^{18}O[/tex] is [tex]-1.383 \times 10^{-11}[/tex] Joules.

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The Ka of the 2-hydroxyethylammonium ion is 3.125 x 10^-10 and the pH of 0.42 M methylammonium bromide is 4.3 x 10^-3.

(a) Given pKb of HOCH2CH2CH2NH2 = 4.49

We know that pKa + pKb = 14 and Ka x Kb = 10^-14

Here pKb = -log(Kb) then Kb = 10^-4.49 = 0.32 x 10^-4

Ka = 10^-14/0.32 x 10^-4 = 3.125 x 10^-10

(b) Given the Kb of  CH3NH2 = 4.4 x 10^-4

pKb = 3.35 then pKa = 14 -3.35 = 10.65

The concentration of methylammonium bromide, CH3NH3Br = 0.42M

CH3NH3Br  -> CH3NH2 + HBr

Kb = [HBr] [CH3NH2]/[CH3NH3Br]

4.4 x 10^-4 =  [HBr] [CH3NH2]/0.42

[HBr] [CH3NH2] = 4.4 x 10^-4 x 0.42 = 1.84 x 10^-4

We know that pH = -log([HBr])

[HBr] = 10^-1.84 x 10^-4 = 0.99M

pH = -log(0.99) = 4.3 x 10^-3

Hence the pH of methylammonium bromide is 4.3 x 10^-3.

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According to the given statement Total amount of heat absorbed = 5,922 J+15,792 J is 21,714 J.

The amount of energy absorbed or released during a chemical reaction can be expressed in terms of Calorie and joule.

The SI unit of energy is the joule (J) and is used to express energy as both heat and work.

Mass of sample m = 47.00 g

specific heat capacity of water c = 4.2Jg −1 K −1

specific latent heat of fusion of ice L = 336Jg −1

Amount of heat energy absorbed when 47.00 g of sample at 0° C changes into 30°C =

47 x 4.2 × 30 = 5,922 J.

Amount of heat energy absorbed when 47.00g of sample at 0° C changes into ice at  0° C = 47 × 336J = 15,792 J.

Total amount of heat absorbed = 5,922 J+15,792 J.

                              21,714 J.

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Answer: Here is your answer Abraham Lincoln was a basketball player for the New York Knicks in 1642 He got drafted by the washinton capitals in 1707 and now he's currently still alive living in 2030.

Explanation:

RNA stays in the nucleus whereas DNA can leave is a false.

Why DNA is stored in the nucleus but RNA can leave it?

A single-stranded mRNA created during DNA transcription exits the nucleus through nuclear pores. Nuclear pores control how molecules are transported into and out of the nucleus.

Where does RNA leave?

Messenger RNAs (mRNAs), which drive protein synthesis, must be exported to the cytoplasm because of this physical barrier, whereas proteins that take part in nuclear functions are imported into the nucleus. Additionally, certain RNA types that have been exported to the cytoplasm come back into the nucleus [1].

Hence above given is a correct answer.

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Answer: You could say carbon monoxide from incomplete combustion

Explanation:

The pressure of the car tire in December will be 259.7 kPa.

The pressure of a given mass of gas is directly proportional to the temperature of the gas.

Hence, the relationship between pressure and temperature is that the pressure increases with temperature.

The pressure of the car tire in December is determined as follows:

P₁/T₁ = P₂/T₂

where;

P₁ is the initial pressure

T₁ is the initial temperature

P₂ is the final pressure

T₂ is the final temperature

The pressure of the car tire in December = 300 * (273 - 15) / (25 + 273)

The pressure of the car tire in December = 259.7 kPa.

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The correct response is B. oxygen-hydrogen. Compared to H, O has the highest polarity.

An electric dipole moment with a negatively charged end and a positively charged end is present in polar molecules or chemical groups. Electric charge is separated by polarity. Polar compounds are those that have one or more polar bonds because the electronegativity of the bound atoms varies. Molecules with polar bonds are not polar if the bond dipoles cancel one another through symmetry. Polar molecules communicate with one another via hydrogen bonds and dipole-dipole intermolecular forces. Polarity is the basis for a number of physical properties, such as surface tension, solubility, melting and boiling points. Despite having a zero net charge, water is polar because of the way its molecules are structured. The molecule has ends that are positive for hydrogen and negative for oxygen. As a result, water molecules are attracted to other polar molecules as well as to one another.

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In order to round this up to 84 grammes correctly after solving for this, we will receive 83.9 grammes. We're finished with this final response.

PubChem's entry for gold trichloride is AuCl3.

used to create various gold compounds as the initial solution. a step before making ultra pure gold metal. Using electroplating as an anode in an electric cell as well as electroless plating. Brightfield and darkfield microscopy both require cell body stains.

Ingestion swallowed is toxic. Skin Absorption through the skin could be dangerous. makes the skin burn.

The quantity and kinds of nutrients that enter and leave the cells are controlled.

Just round this up to 84 grammes correctly once we have solved for this and arrived at 83.9 grammes. We're finished; this is the last response we have.

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One of the reactants is H2O2, therefore raising its concentration would accelerate the process.

As the reactant concentration increases, more reactant particles are moving together. The reaction rate will increase since there will be more collisions. The concentration of the reactants will affect how quickly a reaction proceeds.

A higher concentration of H2O2 would speed up the reaction because it is one of the reactants.

b. As the amount of water increases, the concentration of the reactant falls, which lowers the rate.

S2O3- is one of the reactants, hence boosting its concentration would accelerate the reaction.

d. Starch is solely utilized as an endpoint indication. On the rate, there is no difference.

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The balanced equation for the reaction is BaCl2 + 2NaOH → Ba(OH)2 + 2NaCl

Based on the given information, we can calculate the amount of Ba(OH)2 obtained.

30 g BaCl2 × (1 mol BaCl2/208.23 g BaCl2) × (1 mol Ba(OH)2/1 mol BaCl2) × (137.3 g Ba(OH)2/1 mol Ba(OH)2) = 8.42 g Ba(OH)2

20 g NaOH × (1 mol NaOH/39.997 g NaOH) × (2 mol Ba(OH)2/2 mol NaOH) × (137.3 g Ba(OH)2/1 mol Ba(OH)2) = 17.48 g Ba(OH)2

Therefore, a total of 25.9 g of Ba(OH)2 is obtained during the reaction of 30 g of BaCl2 and 20 g of NaOH.

There is a surplus of NaOH, with a total of 2.5 g of NaOH remaining (20 g NaOH - 17.48 g Ba(OH)2 = 2.52 g NaOH).

What is balanced equation?

A balanced equation is an equation in which the number of atoms of each element on either side of the equation are equal. For example, the following equation is balanced: 2H2 + O2 → 2H2O

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The IUPAC designation for the halogenated chemical with the following structural formula will be trans-1,3-Dichlorocyclohexane.

The longest chain of carbons connected by a single bond, whether in a continuous chain or a ring, serves as the foundation for IUPAC nomenclature. Any variations, whether involving numerous bonds or atoms other than carbon and hydrogen, are indicated by prefixes or suffixes in accordance with a particular set of priorities.

Thus, the IUPAC name is 2,5,5-trimethyl-2-hexene. The longest chain in example (2) that contains both carbon atoms from the double bond is five atoms long. There is a seven-carbon chain present, however there is only one double-bonded carbon atom in the chain. Consequently, this compound's root name will be

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Answer: Air

Explanation: As a metal, aluminum, gold, and copper are all bad insulators and good conductors for heat and electricity. Air in general is a good insulator.

Answer:

Explanation:

It pumps about 79*71 = 5629 ml per minute.

To convert ml to m3, we can use the conversion factor 1 m3 = 1,000,000 ml.

So, 5629 ml = 5629/1,000,000 m3

Then to find the mass of the blood that is being pumped through the heart per minute, we can use the density of the blood which is 1060 kg/m3 and multiply it with the volume of blood (5629/1,000,000 m3) that is being pumped through the heart per minute.

mass of blood = (5629/1,000,000 m3) * 1060 kg/m3 = 5.977 kg/min

The heart pumps about 5.977 kg of blood per minute for a person at rest.

Answer:i think its C

Explanation:

The balanced reactions in term of numbers of atoms and electrons is given below:

3 IO₃- + 1 Re → 3 IO- + 1 ReO₄-

The half-reactions for oxidation and reduction:

Oxidation: IO₃ → IO-

Reduction: Re → ReO₄-

Make sure that the number of electrons gained or lost in each half-reaction is the same. In this case, both reactions involve the loss or gain of one electron, so we can proceed.

Balance the number of atoms of each element on both sides of each half-reaction:

Oxidation: 3 IO₃- → 3 IO-

Reduction: 1 Re → 1 ReO₄-

Multiply one or both half-reactions by a factor so that the number of electrons gained and lost are equal. In this case, we do not need to multiply any of them.

Add the half-reactions together, making sure that any species that appear on both sides of the equation cancel out:

3 IO₃- + 1 Re → 3 IO- + 1 ReO₄-

The reaction is now balanced in terms of atoms and electrons.

Check whether the overall reaction is in basic solution, If the reaction is in basic solution, the final step is to balance the oxygen and hydrogen atoms.

The final balanced equation will be:

3 IO₃- + 1 Re + 3 H₂O → 3 IO- + 1 ReO₄- + 6OH-

The balanced reaction is in basic solution as the overall equation is balanced in terms of oxygen and hydrogen atoms.

Therefore, the correct answer is as given above

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One mole of sulphur contains 6.02 × 10²³ S atoms . Hence, 1 atom is equivalent to 1.6 × 10⁻²⁴ moles of S .

One mole of a substance is its amount containing 6.02 × 10²³  atoms or molecules. This number is called Avogadro number. One mole of every elements contains Avogadro number of atoms.

Similarly one mole of every compound contains 6.02 × 10²³  molecules. The mass of one mole of compound is called its molar mass.

S is 16th element in periodic table. S is nonmetal.  One mole of S contains 6.02 × 10²³ S atoms . Hence number of moles of one atom :

1/ 6.02 × 10²³  =  1.6 × 10⁻²⁴ moles

Hence, there will be  1.6 × 10⁻²⁴ moles  S in one atom of sulphur.

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The rate at which an enzyme-catalyzed reaction takes place is faster than that of an uncatalyzed reaction.

Structure of organisms as enzymes allow our bodies' phase changes, or combustion, to progress more quickly. Others are broken down while others are built. Enzymes exist in every living organism. Enzymes are created in our bodies by nature.

Foods that naturally contain digestive enzymes include kefir, sauerkraut, kimchi, miso, kiwifruit, mangoes, pineapples, papayas, mangoes, honey, bananas, avocados, and ginger. A diet that includes any of these foods may assist to improve gut health and digestion.

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The difference between the two compounds a saturated hydrocarbon is a compound in which all the carbon-carbon bonds are single bonds and an unsaturated hydrocarbon compound that contains at least the double or triple bond between carbon atoms.

A saturated hydrocarbon is a hydrocarbon compound in which all the carbon-carbon bonds are single bonds. An example of a saturated hydrocarbon is methane (CH4). The Lewis structure of methane would be:

H

|

H-C-H

|

H

An unsaturated hydrocarbon is a hydrocarbon compound that contains at least one double or triple bond between carbon atoms. An example of an unsaturated hydrocarbon is ethene (C2H4). The Lewis structure of ethene would be:

H H

| |

C = C

| |

H H

The main difference between saturated and unsaturated hydrocarbons is the presence of double or triple bonds. Saturated hydrocarbons only contain single bonds between carbon atoms, while unsaturated hydrocarbons contain at least one double or triple bond. This difference in bonding leads to a difference in chemical properties such as reactivity. Unsaturated hydrocarbons tend to be more reactive than saturated hydrocarbons because the double or triple bond provides a site for chemical reactions to occur. Saturated hydrocarbons are usually more stable and less reactive than unsaturated hydrocarbons. It's worth to mention that unsaturated hydrocarbons have higher boiling point than saturated hydrocarbons of similar molecular mass because the double bond creates stronger intermolecular forces of attraction between the molecules.

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The given statement stating that air quality is a measure of how clean or polluted the air  in an ecosystem is, hence the statement is  true.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .

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The value of Fx is -5.00N.  The torque or moment of force is the rotational force.

Determine Fx?

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mCPBA is widely used for chemical transformations such as the oxidation of carbonyl compounds.

mCPBA reacts with alkenes to produce epoxides. The stereochemistry is always preserved in this reaction, which is one of its essential characteristics. In other words, a trans alkene will produce a trans epoxide while a cis alkene will produce a cis-epoxide.

Meta-chloroperoxybenzoic acid, or m-CPBA, is a very helpful reagent that is typically used in the synthesis of epoxides. mCPBA, MCPBA, or m-CPBA may all be used interchangeably. It's all essentially the same.

Take note of the additional O in the molecule, which otherwise resembles a carboxylic acid. It should be similar to the distinction between hydrogen per-oxide (HOOH) and hydrogen oxide to understand what is meant by a "per-acid" (H2O). You should take note of how weak the oxygen-oxygen bond is (approximately 33 kcal/mol or 138 kJ/mol).

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Answer:

B. polishing a gemstone

Explanation:

the chemical makeup of the gemstone remains the same, whether polished or not. no reactions occured during that course of action, so it would definitely be considered a physical change.

hope this helped, good luck!

Answer:

a

Explanation:

because sodium and chlorine are in a solid form