7. Although carbon's three isotopes are carbon-12, carbon-13, and carbon-14, its
average atomic mass is 12.01 because

A. carbon-12 is the heaviest isotope.

B. carbon-12 is most useful to humans.

C. carbon-12 is the most common isotope.

For every mole of NaN3 that is broken down, one mole of N2(g) is produced. Using the molar mass of NaN3, which is 68.99 g/mol, we can determine how many moles of NaN3 are present given that we have 50.0 g of the substance.

We get 0.724 mol of NaN3 by dividing 50.0 g by 68.99 g/mol. We can determine that 0.724 mol of NaN3 will result in 0.724 mol of N2(g) since 1 mole of NaN3 yields 1 mole of N2(g). We may use the molar mass of N2(g), which is 28.02 g/mol, to determine the mass of N2(g) produced.

0.724 mol is multiplied by 28.02 g/mol to yield 20.3 g of N2(g). Therefore, 20.3 g of N2(g) will be created from 50.0 g of NaN3.

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Answer:

6. physical

Explanation:

The calorimeter constant of the given system is 140.8 J/°C

The temperature of warm water = 76°C

The volume of the warm water = 75 ml

The temperature of the cold water = 21°C

The volume of the cool water = 50 ml

The final temperature of the water = 47°C

The warm water lost is given by

              q = m Δt Cₚ

where q is the heat loss/gain

           m is the mass of the water

           Δt is the temperature difference

           Cₚ is the Specific heat

             q = 75 x (76 - 47) x 4.184

                = 75 x 29 x 4.184

                = 9,100.2 J

The Coldwater gain is given by

                q =  m Δt Cₚ

                   = 50 x (47 - 21) x 4.184

                   = 50 x 26 x 4.184

                   = 5,439.2 J

The calorimeter got the rest at

                    9,100.2 - 5,439.2 = 3,661 J

Therefore, the calorimeter constant is                    

                      = Calorimeter gain/temperature rise

                      = 3,661 / 26

                      = 140.8 J/°C

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Answer:

Repetition

Explanation:

In the world of science, experiments are regularly conducted to test out hypotheses. These experiments are however, not conducted by scientist once to derive a result. They are rather conducted multiple times (repeated) to ascertain the accuracy i.e not as a result of random occurrence. The experiments that undergo multiple trials are said to undergo REPETITION.

This is the case of the scientist in this question, who is conducting an experiment to test what temperature causes the fastest growth rate in sunflower plants. He conducted the experiment multiple times, making it an example of REPETITION.

N.B: Replication is when the experiment is re-conducted by another scientist to see if same result is derived.

Answer:

Explanation:

the arrow indicates a chemical reaction has occurred mean that

The amount of sodium consumed by a person who eats two grams of salt depends on the sodium content of the salt.

Table salt is typically about 40% sodium, so 2 grams of salt contains approximately 0.8 grams of sodium (2 x 0.4 = 0.8).

Since 1 gram of sodium is equal to 2300 milligrams, then 0.8 grams of sodium is equal to 1844 milligrams (0.8 x 2300 = 1844).

So, a person who eats 2 grams of salt would consume approximately 1844 milligrams of sodium.

It is worth noting that the recommended daily intake of sodium is around 2300 milligrams, so this amount would be close to the recommended daily limit and it's important to monitor the sodium intake in your diet.

Sodium is an essential nutrient that is required for many important bodily functions, including fluid balance, nerve and muscle function, and maintaining healthy blood pressure levels. However, consuming too much sodium can have negative health effects, such as increased risk of heart disease, stroke, and high blood pressure.

That's why it's important to monitor the amount of sodium in your diet. The World Health Organization recommends that adults consume no more than 2,000 milligrams of sodium per day, which is equivalent to about 5 grams of salt. This is a moderate amount that can help maintain healthy blood pressure and reduce the risk of heart disease and stroke.

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Battery refers to intentional infliction of emotional distress is true of battery.

Thus, An object that stores energy and releases it by transforming chemical energy into electricity is a battery. Typical batteries typically employ one or more electrochemical cells to chemically generate electricity.

Alkaline, lithium-ion, lithium-polymer, and nickel-metal hydride batteries are the most typical battery types, while many other materials can and have been used in batteries. Batteries can be linked to one another in a parallel or series circuit.

There are many different sorts of batteries that can be purchased, and these various battery types are employed in various gadgets. Cars are started by large batteries, whereas hearing aids are powered by much smaller batteries.

Thus, Battery refers to intentional infliction of emotional distress is true of battery.

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The true statement about battery is that it refers to the intentional harmful or offensive contact with another person without their consent.

In tort law, battery refers to the intentional harmful or offensive contact with another person without their consent. It is a legal term used to describe the act of intentionally touching or making physical contact with another person in a harmful or offensive manner. It is important to note that battery does not require actual physical injury to occur, but rather focuses on the intentional act of touching or making physical contact with another person without their consent.

Battery can occur even if there is no direct physical contact between the victim and the perpetrator. This means that indirect physical contact, such as through an object or substance, can still be considered battery if it is intentional and causes harm or offense to the victim.

Assault and battery are often mentioned together, but they are distinct legal concepts. Assault refers to the threat of physical harm, while battery refers to the actual physical contact. It is possible for assault and battery to occur together, but they can also occur separately.

It is important to understand that battery can result in civil liability. This means that if someone commits battery, they may be held legally responsible for any harm or damages caused to the victim. The victim may be entitled to compensation for their injuries, medical expenses, and any other damages suffered as a result of the battery.

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Answer:

I ordered the tiles from left to right and top to bottom as the numbers kept increasing. The tiles were also organized based on the color and shape that they were. The tiles with the same color and shape were arranged in the same column.

Explanation:

In the modern periodic table, the elements are listed in order of increasing atomic number and elements having similar chemical properties naturally line up in the same column (group).

Based on the quantity as well as shape of each tile, arrange them in the table.

The majority of the time, tiles are thin, square usually rectangular coverings made of durable materials like ceramic, stone, metals, baked clay, or perhaps even glass. They are typically put in place inside an arrangement to cover surfaces including tabletops, borders, floors, walls, and roofs.

In another definition, a tile is indeed a building material or a comparable object, such the rectangular game counters. The word comes taken from the Latin phrase tegula, which means a roof tile made of heated clay. Based on the quantity as well as shape of each tile, arrange them in the table.

Therefore, based on the quantity as well as shape of each tile, arrange them in the table.

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The **neutral starting materials** needed to generate the described acid anhydride are **4-methylbenzoic acid** and **isobutyric acid**.

To produce the acid anhydride, you will need to perform a condensation reaction between these two carboxylic acids. The 4-methylbenzoic acid contains a benzene ring with a methyl substituent in the 4-position, while the isobutyric acid has an isopropyl group bonded to the carbonyl. When these two acids react in the presence of a dehydrating agent (e.g., P2O5 or SOCl2), a molecule of HCl will be eliminated, and the remaining oxygen will bond to both carbonyl groups, forming the desired acid anhydride. This type of reaction is known as an **acyl substitution** and results in the formation of an oxygen atom flanked by two carbonyl groups with the specified substituents.

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The part of Thomson's model that was not supported by direct evidence is "electrons circled the nucleus like planets around the sun."

This model, is generally known as the planetary model, proposed that electrons moved in fixed orbits around the nucleus of an atom. However, subsequent experiments and discoveries, particularly the results of the Rutherford gold foil experiment, showed that electrons do not move in predictable orbits but rather exist in electron clouds or energy levels surrounding the nucleus.

Therefore, the part of Thomson's model that was not supported by direct evidence is "electrons circled the nucleus like planets around the sun."

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Answer:

True

Explanation:

If you see distilled water, it's a pure substance. That means that there are only water molecules in the liquid. A mixture would be a glass of water with other things dissolved inside, like one of those powders you take if you get sick or Kool-Aid.

4. Hexane would not provide the necessary conditions for a successful NMR experiment. 5. DMSO-d6 is a highly polar solvent as it can dissolve a wide range of compounds.

Yes, there is a solvent listed in the materials section that is inappropriate for NMR. The solvent is hexane. Hexane is a non-polar solvent, which means that it does not dissolve polar molecules very well. Since NMR is a technique that relies on the interaction between magnetic fields and the electrons in a molecule, a polar solvent is needed to ensure that the sample is in solution and that the electrons are properly oriented. Hexane would not provide the necessary conditions for a successful NMR experiment.
If a sample required a more polar solvent than what is available above, the solvent that could be ordered is DMSO-d6. DMSO-d6 is a highly polar solvent and is often used for NMR experiments because it can dissolve a wide range of compounds, including polar molecules. Additionally, it has a low proton signal, which makes it useful for proton NMR experiments. DMSO-d6 can be ordered as a deuterated solvent, which means that it contains no protons and will not interfere with the sample being analyzed.

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4. Hexane would not provide the necessary conditions for a successful NMR experiment. 5. DMSO-d6 is a highly polar solvent as it can dissolve a wide range of compounds.

Yes, there is a solvent listed in the materials section that is inappropriate for NMR. The solvent is hexane. Hexane is a non-polar solvent, which means that it does not dissolve polar molecules very well. Since NMR is a technique that relies on the interaction between magnetic fields and the electrons in a molecule, a polar solvent is needed to ensure that the sample is in solution and that the electrons are properly oriented. Hexane would not provide the necessary conditions for a successful NMR experiment.
If a sample required a more polar solvent than what is available above, the solvent that could be ordered is DMSO-d6. DMSO-d6 is a highly polar solvent and is often used for NMR experiments because it can dissolve a wide range of compounds, including polar molecules. Additionally, it has a low proton signal, which makes it useful for proton NMR experiments. DMSO-d6 can be ordered as a deuterated solvent, which means that it contains no protons and will not interfere with the sample being analyzed.

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(a)The parameters of the binomial distribution are the number of trials (n = 8) and the probability of success (p = 0.8). (b) The exact value of P(X ≤ 5) is approximately 0.04101368. (c)If the p-value is very small (below a predetermined significance level), we may reject the null hypothesis and question the claim. If the p-value is not small, we may fail to reject the null hypothesis and consider the claim plausible.

a) The probability distribution that can be used to model the random variable X is the binomial distribution, as we have a fixed number of trials (8 patients) and each patient has a binary outcome (symptoms relieved or not relieved). The parameters of the binomial distribution are the number of trials (n = 8) and the probability of success (p = 0.8).

b) To find P(X ≤ 5), we need to calculate the cumulative probability of X up to 5 using the binomial distribution. We can use the binomial cumulative distribution function (CDF) or calculate it manually by summing the individual probabilities.

Using the binomial CDF:

P(X ≤ 5) = Σ(i = 0 to 5) [8C(i) × (0.8i)  (0.2(8-i))]

Calculating it manually:

P(X ≤ 5) = P(X = 0) + P(X = 1) + P(X = 2) + P(X = 3) + P(X = 4) + P(X = 5)

Using the binomial probability formula:

P(X = k) = 8C(k) × (0.8k) × (0.2(8-k))

Therefore, the exact value of P(X ≤ 5) is approximately 0.04101368.

c) To assess whether we should believe the claim of United Medicine, Inc., we can perform a hypothesis test using statistical methods. The claim states that 80% of all patients experience symptom relief. In our sample of 8 patients, if we observed 3 patients with symptom relief, we can compare this to the expected proportion of success (p = 0.8) using hypothesis testing.

We can set up a null hypothesis (H0) that the true proportion of patients experiencing symptom relief is equal to 80% (p = 0.8) and an alternative hypothesis (H1) that the true proportion is different from 80% (p ≠ 0.8). We can then perform a statistical test, such as a chi-square test or a z-test for proportions, to determine the likelihood of observing 3 out of 8 patients with symptom relief if the true proportion is indeed 80%.

Based on the results of the statistical test, we can assess the evidence against the null hypothesis and make an informed decision about whether to believe the claim of United Medicine, Inc. If the p-value is very small (below a predetermined significance level), we may reject the null hypothesis and question the claim. If the p-value is not small, we may fail to reject the null hypothesis and consider the claim plausible.

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The volume of the balloon after he heats it to a temperature of 250.0°C is 0.718L.

The volume of a balloon at a particular temperature can be calculated by using the Charles law formula as follows:

V1/T1 = V2/T2

Where;

According to this question, a man heats a balloon in the oven. The balloon initially measures 0.402L with a temperature of 20.0°C. However, the volume of the balloon after he heats it to a temperature of 250.0°C can be calculated as follows:

0.402/293 = V2/523

523 × 0.402 = 293V2

210.25 = 293V2

V2 = 210.25/293

V2 = 0.718L

Therefore, the volume of the balloon after he heats it to a temperature of 250.0°C is 0.718L.

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Answer:

Nope unless u like the ex it’s super wrong but if u like their friend ur good

Explanation:

Answer:

Option D

Explanation:

it has the same types of atoms on both sides of the reaction

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D) It has the same types of atoms on both sides of the reaction arrow.

Explanation:

This law was made by the Antoine Lavoisier in 1789. He want to confirm that the mass of reactant is equal to the mass of product and he was successful to carry out the test.

The cell potential E at 25°C for the given reaction is 1.183 V.

To find the cell potential E at 25°C for the given reaction, we can use the Nernst equation; E = E°cell - (RT/nF) ln(Q)

where; E°cell is the standard cell potential, which is given as +1.100 V

R is the gas constant, which is 8.314 J/(mol×K)

T is the temperature in Kelvin, which is 25°C + 273.15 = 298.15 K

n is the number of electrons transferred in the reaction, which is 2

F will be a Faraday's constant, which is 96,485 C/mol

Q is the reaction quotient, which can be calculated using the concentrations of the species involved in the reaction.

The balanced half-reactions for the cell reaction are:

Zn(s) → Zn²⁺ + 2e⁻

Cu²⁺ + 2e⁻ → Cu(s)

The overall reaction can be obtained by adding the two half-reactions and canceling out the electrons;

Zn(s) + Cu²⁺ → Zn²⁺ + Cu(s)

The reaction quotient Q for this reaction will be;

Q = ([Zn²⁺]/[Cu²⁺]) = 0.10/1.0 = 0.1

Now we can substitute the given values into the Nernst equation;

E = 1.100 V - (8.314 J/(molK) / (296,485 C/mol)) ln(0.1)

E = 1.100 V - (0.0000432 V) ln(0.1)

E = 1.100 V - (-0.08328 V)

E = 1.183 V

Therefore, the cell potential E is 1.183 V.

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Answer:

When aluminum is added to cold dilute hydrochloric acid, there is no reaction because aluminum is a highly reactive metal, but it is protected by a thin oxide layer on its surface. This oxide layer is not easily dissolved by dilute hydrochloric acid, so the aluminum does not react with the acid. In order to react with the acid, a stronger acid such as sulfuric acid or nitric acid is needed to dissolve the oxide layer. Additionally, a higher concentration of hydrochloric acid is also needed to react with aluminum.

Another possible reason is that Aluminium metal react with hydrochloric acid to produce hydrogen gas and aluminum chloride salt, but the reaction is relatively slow and requires heat to speed it up. In cold dilute hydrochloric acid, the reaction rate is too slow to observe any visible change.

Answer:

There is a leyer of aluminium that prevents nothing from happening

Explanation:

Keep in mind that this reaction will not take place as soon as you add the piece of aluminium to the hydrochloric acid solution. That happens because the piece of aluminium is protected by a layer of aluminium oxide, Al2O3 , the same layer that protects aluminium from reacting with water

Answer:

practise, because it helps you get comfortable in speaking english

and there is also a quote that says "practise makes perfect"

Explanation:

HOPE IT HELPS

Answer:

Sorry I am not good at chemistry.

Explanation:

Answer:

steel

Explanation:

Answer:

B. STEEL

Explanation:

The chirality or handedness character of most standard amino acids causes solutions of amino acids to rotate the plane of polarized light.


The chirality of an amino acid refers to the fact that it has a central carbon atom (alpha carbon) bonded to four different groups: an amino group (-NH2), a carboxyl group (-COOH), a hydrogen atom (-H), and a side chain (R group). This asymmetric arrangement creates a mirror image of the molecule, resulting in two possible configurations called enantiomers: L and D forms.  

When a beam of polarized light passes through a solution of amino acids, the molecules interact with the light and rotate the plane of polarization. This phenomenon is known as optical activity. The direction and degree of rotation depend on the specific amino acid and its concentration in the solution.  

In summary, the chirality or handedness character of most standard amino acids causes solutions of amino acids to rotate the plane of polarized light due to their asymmetric structure.

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Answer:

A. 7

(assuming the water is neutral)

Answer:

C

Explanation:

C) an atom with an atomic number of 18

Taking into account the definition of Avogadro's Number, 3.704×10²³ atoms are in a sample of 0.615 mol Ne.

Avogadro's number indicates the amount of elementary entities (molecules, atoms, ions or other similar particles) that a mole of any substance contains. It applies to molecular and atomic substances.

Its value is 6.023×10²³ particles per mole.

You can apply the following rule of three: If 1 mole of Ne contains 6.023×10²³ atoms, 0.615 mole of Ne contains how many atoms?

amount of atoms= (0.615 moles ×6.023×10²³ atoms)÷ 1 mole

amount of atoms= 3.704×10²³ atoms

Finally, 3.704×10²³ atoms of Ne are present.

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Explanation:

2Fe+3Br---> 2FeBr3

it is balanced this way

Answer:

read the them 2 more times

Explanation:

Answer:

Answer:

29%

Explanation:

1.99 / ( 1.99 + 4.88)  x 100% = ~ 29%

Answer:

Explanation:

If a rock is 5 half-lives old, it means that the fraction of the original radioactive material remaining is (1/2)^5 = 1/32. This also means that the fraction of stable product in the rock is 1 - 1/32 = 31/32.

If the total mass of the rock is 16 grams, we can calculate the mass of the stable product as follows:

mass of stable product = (31/32) * 16 grams

= 15.5 grams

Therefore, the mass of stable product in the rock is 15.5 grams.