A gas sample occupies a volume of 155 mL at a temperature of 316 K and a pressure of 0. 989 atm. How many moles of gas are there? 


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Answer:

The decrease of decomposers. The decrease of decomposers led to a change in carbon dioxide in biodome files.

Answer:

\(1212.42\ \text{mph}\)

Explanation:

We need to convert \(542\ \text{m/s}\) to \(\text{miles/hour}\)

\(1\ \text{mile}=5280\ \text{ft}\)

\(1\ \text{ft}=12\ \text{inches}\)

\(5280\ \text{ft}=5280\times 12=63360\ \text{inches}\)

\(1\ \text{inch}=2.54\ \text{cm}=0.0254\ \text{m}\)

\(63360\ \text{inches}=63360\times 0.0254=1609.344\ \text{m}\)

So

\(1\ \text{mile}=1609.344\ \text{m}\\\Rightarrow 1\ \text{m}=\dfrac{1}{1609.34}\ \text{miles}\)

\(1\ \text{hour}=60\times 60\ \text{seconds}\\\Rightarrow 1\ \text{s}=\dfrac{1}{3600}\ \text{hour}\)

\(542\ \text{m/s}=\dfrac{\dfrac{542}{1609.34}}{\dfrac{1}{3600}}=1212.42\ \text{mph}\)

The speed of the gas molecules is \(1212.42\ \text{mph}\).

(a) bromocyclopentane needs reagent HBr (hydrogen bromide) and a peroxide initiator

(b) trans-1,2-dibromocyclopentane needs reagent Br₂

(c) 3- bromocyclopentene needs reagent tN-bromosuccinimide (NBS)

To convert cyclopentene to bromocyclopentane, the reagent needed is HBr (hydrogen bromide) and a peroxide initiator such as benzoyl peroxide. This will result in the addition of a bromine atom to the carbon-carbon double bond.

To convert cyclopentene to trans-1,2-dibromocyclopentane, the reagent needed is Br₂ (bromine) in the presence of a solvent such as CH₂Cl₂ (dichloromethane) or CCl₄ (carbon tetrachloride) and a Lewis acid catalyst such as FeBr₃ (iron(III) bromide). This will result in the addition of two bromine atoms in a trans configuration across the double bond.

To convert cyclopentene to 3-bromocyclopentene, the reagent needed is N-bromosuccinimide (NBS) in the presence of light or heat. This will result in the addition of a bromine atom to the carbon-carbon double bond in a regioselective manner to give the 3-bromo product.

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Answer:

Since different isotopes of an element have different numbers of neutrons (but always the same number of protons) they have different mass numbers. Nitrogen-14 and nitrogen-15 are both stable isotopes of nitrogen. However, the other 5 isotopes are all unstable.

The equation that represents a single replacement reaction given the various options is 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) (option 2)

A single replacement reaction, also known as single displacement reaction is a reaction in which elements higher in the electro-chemical series displace or replace elements lower in the electro-chemical series displace from a solution.

The following example illustrates single replacement reaction:

A + BC -> AC + B

From the above reaction, we can see that A has replace/displace B to from AC.

With the above information, we can determine the equation that represents single replacement reaction. Details below:

Equation from the questions:

From the above, we can see that only 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) conform to single replacement reaction.

Thus, the correct answer to the question is: 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) (option 2)

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Answer:

100 g of water dissolves 204 g of sugar. Therefore, 25 g of water would dissolve 204×25÷100 =51g of sugar at 20°C.

Explanation:

Answer: 408g of sugar

Explanation: the amount of water increased by 2

so, multiply: 204 times 2= 408

The compound that exhibits only two signals in its 1H NMR spectrum, a triplet and a quintet, is (d) Ch₃Ch₂Ch₂Ch₃.

This compound has two types of hydrogen environments: one is at the CH₃ end groups (a triplet) and the other is at the CH₂ groups in the middle (a quintet).A triplet in an NMR spectrum indicates the presence of two adjacent protons, while a quintet suggests the presence of four adjacent protons. In the 1H NMR spectrum, the number of signals corresponds to the different types of hydrogen atoms (protons) present in a molecule. Each unique chemical environment around a proton gives rise to a distinct signal. The splitting pattern of a signal (such as triplet or quintet) provides information about the neighboring protons.

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First, we need to make the exponent of 10 the same for both.

So let's transform 6.5500 x 10^5 into some number x 10^3.

For this, we need to move the dot to the right, some places where it gives the number 3. In this case, 2 places.

655.00 x 10^3

now we can sum the numbers

8.6500 x 10^3 + 655.00 x 10^3 = 663.65 x 10^3

now we need to transform this number into scientific notation. For this, must have only one number before the dot(on the left side of the dot). We will move the dot to the left, 2 places:

6.6365 x 10^5

Answer: 6.6365 x 10^5

The correct answer is the heat associated with the burning of 346 g of white phosphorus in air is -8405 kJ. This indicates that the reaction is highly exothermic, and that a large amount of energy is released during the reaction.

To calculate the heat associated with the burning of 346 g of white phosphorus, we need to first determine the number of moles of P4 involved in the reaction.

The molar mass of P4 is 123.89 g/mol, so 346 g of P4 would be equal to 2.79 moles of P4.

Next, we can use the balanced chemical equation to determine the amount of heat released during the reaction.

From the equation, we can see that 1 mole of P4 reacts with 5 moles of O2 to produce 1 mole of P4O10, and that the enthalpy change (ΔH) for the reaction is -3013 kJ/mol.

Since we have 2.79 moles of P4, we can assume that we also have 5 times that amount of O2, or 13.95 moles.

This means that 2.79 moles of P4 will react with 13.95 moles of O2 to produce 2.79 moles of P4O10.

The total amount of heat released can be calculated by multiplying the moles of P4 by the enthalpy change per mole of the reaction:

-3013 kJ/mol x 2.79 mol = -8405 kJ

Therefore, the heat associated with the burning of 346 g of white phosphorus in air is -8405 kJ. This indicates that the reaction is highly exothermic, and that a large amount of energy is released during the reaction.

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About a single medium-sized navel orange, will a person need to eat to get the same amount of vitamin c in one table.

Tests reveal that the body is protected by more than simply the vitamin. According to new research, vitamin C supplements are not the best option if you're looking for an antioxidant to keep your body young and healthy. Instead, you'd be much better off eating oranges.

The fruit's peel actually has higher levels of fiber and vitamin C than the fruit's flesh "said Thornton-Wood. "Additionally, polyphenols are present.

Therefore, Oranges have long ruled as the preferred source of vitamin C when it comes to ensuring adequate intake. And one medium-sized navel orange contains 70 mg of vitamin C, so you only need roughly one serving to get your recommended daily intake (the Daily Value for vitamin C is 75 mg for women and 90 mg for men).

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Carbon NMR:Spectrum: The chemical shift of the aromatic carbons (Ph–) appears between 128 ppm and 131 ppm. The presence of the double bond (–CH=) appears in the range of 137 ppm to 142 ppm. The benzyl carbon (PhCH2–) appears between 46 ppm and 47 ppm.

The reaction of 1-phenylethylamine with Biphenyl-4-carboxaldehyde produces N-(4-phenylbenzylidene)-1-phenylethylamine. The NMR (Nuclear Magnetic Resonance) spectroscopy is a powerful tool for determining the chemical structure of organic compounds. It is used to analyze the proton and carbon environments of the compound.Here's a detailed analysis of the NMR of N-(4-phenyl benzylidene)-1-phenylethanolamine: Proton NMR:Spectrum:In the proton NMR, the presence of the hydrogen of the amine group (–NH) appears between 4.8 ppm and 5.1 ppm. The hydrogen atoms on the double bond (–CH=) appear between 7.3 ppm and 7.4 ppm. The presence of aromatic protons (Ph–) appears in the range of 7.0 ppm to 7.2 ppm and the presence of benzyl proton (PhCH2–) appears at 4.7 ppm. Carbon NMR:Spectrum:The chemical shift of the aromatic carbons (Ph–) appears between 128 ppm and 131 ppm. The presence of the double bond (–CH=) appears in the range of 137 ppm to 142 ppm. The benzyl carbon (PhCH2–) appears between 46 ppm and 47 ppm.

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This bizarre aspect of water so important because when the frozen (or nearly frozen) surface of a lake warms, the water sinks, which pushes nutrient-rich water up from the depths.

Water is an unusual liquid and has unique properties, but it doesn't behave the exact opposite of other liquids.

Water does indeed expand when warms, and it contracts when it cools, but not at all temperatures. An oddity occurs between 4 and 0 degrees Celsius (about 40 and 32 degrees Fahrenheit). As water cools from 4 to 0 degrees Celsius, it expands because it's crystallizing into ice. And as water warms from 0 to 4 degrees Celsius, it shrinks. But only within this range. Then it starts to expand again.

It is a result of Hydrogen bonds present within water molecules.

When the water is transformed to ice at 0 degree Celsius, the water molecules are in a crystal lattice in a structure that has a lot of empty space around each molecule.

Now, let’s heat the ice to transform it again in liquid water. While heating, at 0–4 degree Celsius range, the volume of the water decreases. Because at this range, some hydrogen bonds are broken because of heat and as a result, water molecules can come near to one another.

As we know density is mass per unit volume. In this case our mass remain constant but the volume is decreasing which results the increase in density.

At 4 degree Celsius all the hydrogen bonds are broken down. If you continue heating after this region, volume of water will increase normally as a result of heat and the density will be decreasing.

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Awnser

B. Metallic bonds

Explanation:

Castle Learning

Answer:

B) metallic bonds

Explanation:

Castle learning

Answer:

Physical dependence is characterized by tolerance and withdrawal. Drug or substance dependency is psychological.

Answer:

The reason why Newtons first law of motion is sometimes called the law of inertia is because it states that if the object is in motion, it will not rest unless an unbalanced force acts on the object.

Answer:

isobars

Explanation:

How?

So they are isobars

The new volume of oxygen is 17.378 L.

“If a gas is contained in a closed chamber with constant mass and pressure, then its volume is directly proportional to its absolute temperature"

The relationship between volume and absolute temperature in the Charles equation is directly proportional. That is, if the temperature increases, the volume also increases. Conversely, if the temperature decreases, the volume of gas also decreases.

Thus, the simplest Charles law equation can be expressed as:

K = V/T

With,

V = gas volume (m³)

T =  absolute temperature (K)

k : constant

So, Charles' law equation can be written as:

V₁/T₁ = V₂/T₂

Where:

V₁ = initial volume of gas = 30 L

T₁ = initial temperature of gas = 473 K

V₂ = new volume of gas = ?

T₂ = new temperature of gas = 274

On putting all these values on the above equation, we get

V₂ = (30)(274) / 473 = 17.378 L

So, the new volume of oxygen is 17.378 L.

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For getting an indication whether a chemical reaction or chemical change has taken place, if  B)Heat is given off then chemical reactions occur. So,correct option is B.

Chemical reactions are surrounding us, from the digestion of food in our body to how the light we get from the sun is the consequence of compound responses. Prior to starting with compound responses, realizing about physical and synthetic changes is significant

Option A can't be the response is dissolving is an actual change. No substance response occurred.

Option B is the response as it is an EXOTHERMIC reaction so intensity will be emitted.

Option C can't be the response as dissolving is essentially ions becoming particles, not a synthetic response by which a reactant responds with one more reactant to shape an item.

Option D can't be the response. Same explanation with respect to why An isn't the response.

Hence, correct option is B.

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(Complete question) is:

When determining whether a chemical reaction has taken place, you observe and look for several indicators. Which would be considered an indication that a chemical reaction or chemical change has taken place? A) Solid melts. B) Heat is given off. C) Substance dissolves D) Substance changes shape.

Considering the reaction stoichiometry, the quantity of moles of H₂O produced is 3.02 moles.

The balanced reaction is:

CuO + H₂ → Cu + H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:  

The molar mass of the compounds present in the reaction is:

Then, by reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of mass of each compound participate in the reaction:  

Then, it is possible to determine the moles of H₂O necessary by the following rule of three:  If by reaction stoichiometry 79.55 grams of CuO produces 1 mole of H₂O, 240 grams of CuO produces how many moles of H₂O?

\(molesofH_{2} O=\frac{240 grams of CuOx 1 mole ofH_{2} O }{79.55 grams of CuO}\)

moles of H₂O= 3.02 moles

Finally, the quantity of moles of H₂O produced is 3.02 moles.

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Answer:

103.842 g/mol

Explanation:

The molar mass of a compound can be calculated by adding the elements and their atomic masses (use a periodic table)

Fe: 55.845

O: 15.999 (there are three oxygens)

55.845 + 15.999*3 = 103.842

For the given buffers;

a) Sodium lactate and lactic acid are effective in the acidic pH region (around pH 3-4).

b) Sodium benzoate and benzoic acid are effective in the acidic pH region (around pH 4-5).

c) K₃PO₄ and K₂HPO₄ are effective in the pH range between approximately pH 2-7.

d) K₂HPO₄ and KH₂PO₄ are effective in the pH range between approximately pH 7-12.

e) Hydroxylamine and hydroxylammonium chloride are effective in the pH range of 5-7.

Buffers are solutions that can resist changes in pH when small amounts of acid or base are added to them.

Buffers are composed of a weak acid and its conjugate base or a weak base and its conjugate acid in roughly equal concentrations. The weak acid and its conjugate base are able to react with additional acid or base, respectively, to maintain the pH of the solution relatively stable.

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The smallest units of matter having the chemical properties of the element are called Atoms.

Atoms of an element usually have the same chemical properties as a result of the absence of any difference between them. They are involved in chemical reactions through various types of bonding and methods.

They are  referred to as a combination of two or more atoms. We should note that all compounds are molecules, but not all molecules are compounds.

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Considering the reaction stoichiometry and Avogadro's Number, the mass of barium chloride produced is 21.6 grams.

The balanced reaction is

2 HCl + Ba → BaCl₂ + H₂

Avogadro's Number is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.

Then you can apply the following rule of three: if 6.023×10²³ molecules are contained in 1 mole of HCl, then 1.25×10²³ molecules are contained in how many moles of HCl?

amount of moles of HCl= (1.25×10²³ molecules × 1 mole)÷ 6.023×10²³ atoms

amount of moles of HCl= 0.2075 moles

Then, 0.2075 moles of HCl react.

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

Then you can apply the following rule of three: if by stoichiometry 2 moles of HCl produce 1 mole of BaCl₂, 0.2075 moles of HCl will produce how many moles of BaCl₂?

\(amount of moles of BaCl_{2} =\frac{0.2075 moles of HCl x 1 mole of BaCl_{2} }{ 2moles of HCl}\)

amount of moles of BaCl₂= 0.10375 moles

Being the molar mass of BaCl₂ 208.24 g/mole, then the mass of barium chloride produced is calculated as:

\(0.10375 molesx\frac{208.24 grams}{1 mole} =21.6 grams\)

Finally, the mass of barium chloride produced is 21.6 grams.

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The poor specificity of the sulfur reduction test is responsible for not being able to differentiate between H ₂S produced by anaerobic respiration and H ₂S  produced by putrefaction.

What is the sulfur reduction test, The sulfur reduction test is a biochemical test that helps to determine the ability of an organism to reduce sulfur and produce H ₂S (hydrogen sulfide). The test is carried out by inoculating a sulfur-containing medium with the test organism and observing whether the medium changes colour due to the production of H ₂S.

Why is the sulfur reduction test not able to differentiate between H ₂S produced by anaerobic respiration and H ₂S produced by putrefaction, The sulfur reduction test is not able to differentiate between H ₂S produced by anaerobic respiration and H ₂S produced by putrefaction due to the poor specificity of the test.

This means that the test is not able to distinguish between the different sources of H ₂S production and can only detect the presence or absence of H ₂S without providing information on its source.

Therefore, the test has poor specificity but not poor sensitivity since it is able to detect the presence of H ₂S, but cannot distinguish between its different sources.

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