For a comparative or experimental investigation, scientists often make a testable ___ about a scientific question, and then they test it in the investigation. A. Control B. Hypothesis C. Procedure D. System

The original amount of a radioactive sample should be multiplied by (one half) superscript n to calculate the amount remaining.

This is the time taken for half a substance to decay.

The number of half-lives a substance has undergone is related to its original amount as and amount remaining according to the following equation:

N = N₀ × (½)ⁿ

Where

From the above equation, we can conclude that the original amount of a radioactive sample should be multiplied by (one half) superscript n

to calculate the amount remaining.

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Answer:

c. (1/2)^n

Explanation:

Answer:

noc

Explanation:

xd

Answer:

It is possible to fill a balloon with a mixture of hydrogen and oxygen and find that ... the following equation is balanced because the total mass of the reactants is ... of hydrogen and one mole of oxygen is equal to the mass of two moles of water.

Explanation:

ig this can be Explanation:

and the answer:)

Answer:

Si tú puedes 1-2-3-4-5-6-7-8-9-10 eso debes de ser más bien dicho sacaran Club Ojalá que te ayude Chau

Explanation:

de Ojalá que te ayude No te olvides de sacar todas las preguntas esas lo que tú dijiste y si tú promoción 123 saquen globo que quieras tú

Answer:

1 mole of car

Explanation:

One mole of a substance is said to be equal to 6.02 × 10^23 atoms, which is Avagadro's number or constant. In other words, 1mole of every substance = 6.02 × 10^23 atoms. Hence, the number of moles in a substance can be calculated by dividing the number of atoms contained in that substance (nA) by 6.02 × 10^23.

According to this question, If I have 6.02 x 10^23 cars, this means that I have:

6.02 x 10^23 cars ÷ 6.02 x 10^23

= 6.02 ÷ 6.02 × 10^(23-23)

= 1 × 1^0

= 1mole of car

The IUPAC name for the compound H₃C-CH₂-CH-CH₂ is 3-methylbutane.

Let's break down the naming process step by step :

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The natural abundance of 79Br is 98.89% and the natural abundance of 81Br is 101.11%.

Atomic masses are the weights of individual atoms in atomic mass units (amu). Bromine is a chemical element with two stable isotopes: 79Br and 81Br.

The average atomic mass of bromine is calculated as the weighted average of the atomic masses of its isotopes, taking into account their natural abundances.

The natural abundance of an isotope can be calculated using the formula:

Abundance = (Atomic mass of isotope / Average atomic mass) * 100%

For 79Br:

Abundance = (78.918336 amu / 79.904 amu) * 100% = 98.89%

For 81Br:

Abundance = (80.916290 amu / 79.904 amu) * 100% = 101.11%

So, the natural abundance of 79Br is 98.89% and the natural abundance of 81Br is 101.11%.

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Exergonic reactions release energy during product formation.

Exergonic reactions are chemical reactions that release energy as they occur. In an exergonic reaction, the reactants contain more potential energy than the products, and the excess energy is released into the environment.

Exergonic reactions are important in many biological processes, such as cellular respiration, where energy is released from the breakdown of glucose to power the cell's activities.

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The pH at the equivalence point is 7.0, as the reaction between the acid and puradine produces a neutral solution. To calculate the pH at each volume of added acid, you can use the equation pH = -log[H+].

At the start of the titration, before any acid is added, the pH can be calculated using the initial concentration of the puradine solution, which is 0.125 M.

pH = -log(0.125) = 0.903

As acid is added, the concentration of H+ ions increases, leading to a decrease in pH. The volume of acid required to reach the equivalence point can be calculated using the formula:

Macid x Vacid = Mpura x Vpura

Where Macid and Mpura are the molarities of the acid and puradine solutions, respectively, and Vacid and Vpura are the volumes of acid and puradine solutions used.

Once the equivalence point is reached, any additional acid added will lead to a sharp decrease in pH. The pH at the equivalence point is 7.0, as the reaction between the acid and puradine produces a neutral solution.

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Cytochrome c is a small protein molecule located in the mitochondrial membrane and serves as an electron carrier in the electron transport chain.

Cytochrome c is a protein that plays an important role in the electron transport chain. It transfers electrons between Complex III and Complex IV in the electron transport chain, helping to create a proton gradient across the inner mitochondrial membrane.

This proton gradient is used to produce ATP, the energy currency of the cell. Without cytochrome c, the electron transport chain would not be able to function efficiently and produce the energy needed for cellular processes.

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Answer:

integral of 17 tan*(x) x dx = uv - integral of v du

= (17 tan*(x))(1/2)x^2 - integral of (1/2)x^2 (17 sec^2(x) dx)

= (17/2) tan*(x) x^2 - (17/4) integral of sec^2(x) dx

= (17/2) tan*(x) x^2 - (17/4) tan(x) + C

where C is the constant of integration.

For the second integral, the integral of (64 + e^x)dx, we can integrate each term separately. The integral of 64 dx is simply 64x, and the integral of e^x dx is e^x. Therefore,

integral of (64 + e^x) dx = 64x

Explanation:

Answer has the explaination.

To evaluate the integral of 17 tan(x) x dx, we can use integration by substitution.

Let u = tan(x), then du/dx = sec^2(x) and dx = du/sec^2(x). Substituting these into the integral gives 17∫u du. Integrating u with respect to itself gives (17/2)u^2 + C. Substituting u = tan(x) back in gives the final answer of (17/2)tan^2(x) + C. Don't forget to include the absolute value of tan(x) when necessary. To evaluate the integral, first note the given function: 17tan(x) x^2 dx. We can apply integration by parts, using the formula ∫u dv = uv - ∫v du. Let u = x^2, so du = 2x dx, and let dv = 17tan(x) dx, so v = 17∫tan(x) dx = -17ln|cos(x)|.
Now, uv - ∫v du = -17x^2ln|cos(x)| - ∫(-17ln|cos(x)|)(2x dx). Next, apply integration by parts again on ∫(-17ln|cos(x)|)(2x dx), with u = 2x and dv = -17ln|cos(x)| dx.
Simplify and combine terms, then add C for the constant of integration to obtain the final answer.

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▪︎ Assuming temperature constant!

P1V1=P2V2(Temp. constant)

So,

0.75×13.35 = 2.00×V2

V2 = (0.75×13.35)/2.00

V2 = 10.0125/2.00

V2 = 5.00625L

Thank you!:)

Answer:

Africa

Explanation:

Ang Africa ay ang kontinente na mayroong pinakamataas na bilang ng mga bansa sa lahat ng mga kontinente.

Kasalukuyan, ang bilang ng mga bansa sa kontinente ay 54, ito ay 53 bago ang South Sudan ang pinakabagong sumali.

Ang bilang na ito ay pinaniniwalaang tataas sa mga darating na taon dahil sa kaguluhan ng iba't ibang mga segment sa ilang mga bansa para sa kalayaan

Answer:

no. of protons = atomic number of the elements

The correct order of ranking according to  Cahn-Ingold-Prelog rules is as follows: NH₂, CH₂OH, D, H.

Cahn, Ingold, and Prelog formulated a rule to specify the arrangement of the atoms or groups that are present in an asymmetric molecule. This rule is called a Cahn-Ingold-Prelog system. This system is generally used in the R, S system of nomenclature.

According to this rule, such an atom that is directly linked to the asymmetric carbon atom is given the highest priority that has the highest atomic number. So here  Nitrogen atom of  NH₂ molecule is given the highest priority because Nitrogen has 7 atomic numbers. Carbon atom of  CH₂OH molecule  has 6 atomic number. So it is given 2nd position. Deuterium and Hydrogen have 2 and 1 atomic numbers respectively so the are given 3rd and 4th order respectively.                                    

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The complete question should be

Rank the following groups in terms of their priority according to the Cahn-Ingold-Prelog system of priorities. Give the highest ranking group a priority of 1 and the lowest ranking group a priority of 4.

a. D

b. H

c. NH₂

d. CH₂OH        

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To calculate the following for test tube 1 and test tube 2:

1. The number of moles of copper(II) sulfate used:

Test tube 1: 0.2 g of copper(II) sulfate was used, which is equivalent to 0.001255 moles (0.2 g / 159.60 g/mol).
Test tube 2: 0.4 g of copper(II) sulfate was used, which is equivalent to 0.002510 moles (0.4 g / 159.60 g/mol).

2. The heat absorbed by the water, in joules:

Test tube 1: Q = (10.0 g) x (4.186 J/g°C) x (20.0°C) = 837.2 J

Test tube 2: Q = (10.0 g) x (4.186 J/g°C) x (30.0°C) = 1257.9 J

3. The change in internal energy of the copper(II) sulfate:
Since the energy released by the copper(II) sulfate is absorbed by the water, the change in internal energy of the copper(II) sulfate is equal to the negative of the heat absorbed by the water.
Test tube 1: ΔU = -837.2 J
Test tube 2: ΔU = -1257.9 J
4. The reaction enthalpy, in joules/mole:
The reaction enthalpy can be calculated using the formula ΔH = ΔU + PΔV, where PΔV represents the work done by the system. Assuming that the reaction was carried out at constant pressure (i.e., atmospheric pressure), PΔV can be approximated to zero, and thus the reaction enthalpy is equal to the change in internal energy.
Test tube 1: ΔH = -837.2 J / 0.001255 mol = -666,876 J/mol
Test tube 2: ΔH = -1257.9 J / 0.002510 mol = -500,357 J/mol
Therefore, the results can be recorded in the following table:

|           | Moles of CuSO4 used | Heat absorbed by water (J) | Change in internal energy (J) | Reaction enthalpy (J/mol) |
|-----------|---------------------|-----------------------------|---------------------------------|---------------------------|
| Test tube 1 | 0.001255            | 837.2                       | -837.2                          | -666,876                 |
| Test tube 2 | 0.002510            | 1257.9                      | -1257.9                         | -500,357                 |

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Increasing the temperature in the exothermic production of ammonia from its elements, known as the Haber-Bosch process, affects both the reaction rate and yield. Reaction rate typically increases with an increase in temperature. This is due to the fact that higher temperatures provide more thermal energy to the reactant molecules, enabling them to overcome the activation energy barrier more easily. As a result, more productive collisions occur between the reacting species, leading to a faster reaction rate.

However, the yield of the ammonia production is influenced by temperature in a slightly different manner. While the reaction rate may increase, a higher temperature can also cause a decrease in the equilibrium yield of ammonia. This is because the Haber-Bosch process is an equilibrium reaction, and according to Le Chatelier's principle, increasing the temperature will favor the endothermic direction of the reaction. In this case, it means that the equilibrium will shift towards the reactant side, resulting in a lower yield of ammonia. Therefore, there is a trade-off between reaction rate and yield when adjusting the temperature in the Haber-Bosch process. The optimal temperature is usually chosen to maximize the yield while maintaining a reasonable reaction rate for efficient production.

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Answer:

arsenous acid

Explanation:

Answer:

3H2 + N2 ---> 2NH3

Explanation:

Answer:

The answer is

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

\(volume = \frac{mass}{density} \\ \)

From the question

mass of rock = 16 g

density = 4 g/mL

The volume of the rock is

\(volume = \frac{16}{4} \\ \)

We have the final answer as

Hope this helps you

To shed light on the process by which titanium dioxide (TiO2) nanoparticles are formed, titanium tetrachloride (TiCl4) hydrolysis has been investigated.

Hydrogen chloride (HCl) gas, which is extremely caustic and hazardous, is known to be released violently when TiCl4 reacts with water. The estimate of the scope and gravity of the effects of large accidents that have been identified, such as an unintentional spill of TiCl4, is, however, not shared by the industry.

An alternative strategy (which is the opposite of the solution above) would be to assert that since metal chlorides are often ionic, titanium chloride must be a tiny (covalent) molecule with weak molecular interactions if it is a liquid at room temperature.

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Answer: 0.0016 moles of copper are present in copper gluconate

Explanation:

The number of moles is defined as the ratio of the mass of a substance to its molar mass.

The equation used is:

\(\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}\) ......(1)

Given mass of copper = 0.1 g

Molar mass of copper = 63.55 g/mol

Plugging values in equation 1:

\(\text{Moles of copper}=\frac{0.1g}{63.55g/mol}=0.0016 mol\)

Hence, 0.0016 moles of copper are present in copper gluconate

Answer:

Outermost zone

Explanation:

Because the outermost zone is the hottest part of the flame.

Answer:

outer most zone

Explanation:

The outermost zone is used by a goldsmith for melting gold and silver. This is because it is the hottest zone of the flame where complete combustion takes place.

INFORMATION:

We have:

- 66 grams of NaCl

- 255 grams of water

If the NaCl is dissolved into the water, we must find the mass percent

STEP BY STEP EXPLANATION:

To find the mass percent we must must use the next formula

In our case,

- the solute is NaCl

- the solution would be the sum of masses from NaCl and water

Then,

- mass of solute = 66 g

- mass of solution = 66 g + 255 g = 321 g

Finally, replacing in the formula,

ANSWER:

The mass percent when 66 grams of NaCl is dissolved in 255 grams of water is 20.60%

Answer:a mouse

Explanation:

Answer: a mouse

Explanation:

Free radicals are highly reactive molecules or atoms that have unpaired electrons in their outer shells.
Negative health consequences of a high amount of free radicals in the system include, Oxidative Stress, Inflammation, Cellular Damage.
Antioxidants are substances that can neutralize or counteract the damaging effects of free radicals.


Free radicals are highly reactive molecules or atoms that have unpaired electrons in their outer shells. They are formed as natural byproducts of various biological processes in the body, such as metabolism, immune response, and environmental factors like pollution, radiation, or smoking. Free radicals are unstable and seek to stabilize themselves by oxidizing other molecules in the body, leading to a chain reaction of damage to cells, proteins, and DNA.

Negative health consequences of a high amount of free radicals in the system include:

Oxidative Stress: Excessive free radicals can cause oxidative stress, which is an imbalance between the production of free radicals and the body's antioxidant defenses. This can result in damage to cellular components and contribute to the development of chronic diseases, including cancer, cardiovascular diseases, neurodegenerative disorders, and aging.

Inflammation: Free radicals can trigger and perpetuate inflammation in the body. Chronic inflammation is associated with various health conditions, including arthritis, asthma, diabetes, and autoimmune disorders.

Cellular Damage: Free radicals can damage cell membranes, proteins, and DNA, leading to mutations, cell dysfunction, and impaired cellular processes. This can disrupt normal cell function and contribute to the development of diseases.

Antioxidants are substances that can neutralize or counteract the damaging effects of free radicals. They help inhibit or reduce the oxidation of other molecules by donating an electron to stabilize the free radicals without becoming free radicals themselves. Antioxidants can be naturally occurring compounds found in fruits, vegetables, whole grains, nuts, and seeds, as well as synthetic substances. Some common antioxidants include vitamins C and E, beta-carotene, selenium, and various phytochemicals. Consuming a diet rich in antioxidants or supplementing with antioxidants can help protect against oxidative stress and mitigate the negative health consequences associated with high levels of free radicals.


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Answer:

A.A gas exerts pressure on the walls of the container. Reason: They have high kinetic energy and negligible force of attraction to move constantly moving with high speed in all directions. ... These collisions of the gas particles with the container walls exert pressure on the walls of the container.

B A gas exerts pressure on the walls of the container due to imapact of its gas molecules with hight velocity .

C.A wooden table should be called a solid. Reason: It has a definite shape and volume. It is very rigid and cannot be compressed, i.e., it has a solid characteristic.

D.We can easily move our hand in air but to do the same through a solid block of wood we need a karate expert. It is because the molecules of air has less force of attraction between them and a very small external force can separate them and pass through it.

Explanation:

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In a 60g sample of tetraethyl-lead, a gasoline is addictive, is found to contain 38.43g lead, 17.83g carbon and 3.74g hydrogen, its empirical formula is PbC₆H₂₀.

The term Empirical formula is defined as the chemical formula of a compound that gives the ratios of the elements present in the compound but not the actual numbers or arrangement of atoms.

The percentage mass of Pb = 38.43/60 × 100

= 64.05 %

The percentage mass of C = 17.83/60 × 100

= 29.71%

The percentage mass of H = 3.74/60 × 100

= 6.23%

Now,

Pb → 64.05/207

= 0.3094

C ⇾ 29.71/12

= 2.475

H ⇾ 6.23/1

= 6.23

Therefore, the ratio is as follows:

Pb : C : H = 1 : 8 : 20

Thus, empirical formula is PbC₆H₂₀.

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