Chromium can help you build bigger muscles and stay lean when you are lifting weights.

True or False?

The effect of changing the temperature of the nitric acid on the rate of reaction. (Include measuring the volume of carbon dioxide gas produced) is Rate of reaction increases.

When we increase the temperature of the reaction the rate of reaction also increases. With the increase of the temperature of the nitric acid HNO₃, the rate of the reaction also increases as the molecule moves faster. Arrhenius equation given as :'

k = Ae^(Ea / RT)

or, ln k = -Ea /RT + ln A

where,

k = rate constant

A = Arrhenius constant

Ea = activation energy

R = gas constant

T = temperature

Thus, The effect of changing the temperature of the nitric acid on the rate of reaction. (Include measuring the volume of carbon dioxide gas produced) is Rate of reaction increases.

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The first and last dissociation reactions of phosphoric acid are of no significance to pH buffering in cells because they occur at extreme pH values that are outside the physiological pH range.

Phosphoric acid (\(H_{3}PO_{4}\)) has three dissociation reactions:

1. \(H_{3}PO_{4}\) → \(H_{2}PO_{4}^{-}\) + H+
2. \(H_{2}PO_{4}^{-}\) → \(HPO_{4}^{-}\) + H+
3. \(HPO_{4}^{-}\)  → \(PO_{4}^{3-}\)  + H+

The first reaction occurs at a very low pH (pKa1 ≈ 2.15), and the last reaction occurs at a high pH (pKa3 ≈ 12.3). Cellular pH is maintained within a narrow physiological range (approximately 7.2-7.4). The second dissociation reaction (pKa2 ≈ 7.2) is the most relevant for cellular pH buffering since it occurs within this physiological pH range. Therefore, the first and last dissociation reactions of phosphoric acid are of no significance to pH buffering in cells as they do not contribute to maintaining the cellular pH within the required range.

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In scientific investigations, the effect of fertilizer on plant growth can be studied by examining various variables. Two key variables in this context are the presence or absence of fertilizer (independent variable) and the size or growth of the plant (dependent variable).

When investigating the effect of fertilizer on plant growth, the independent variable is the presence or absence of fertilizer. This variable is controlled by having two groups of plants: one group receiving fertilizer (experimental group) and another group without fertilizer (control group). By comparing the growth of these two groups, we can determine the impact of fertilizer on plant size.

The dependent variable, on the other hand, is the size or growth of the plant. This variable is measured or observed as the outcome of interest. In this case, it would be the height, weight, or overall size of the plants.

By systematically changing the independent variable (presence or absence of fertilizer), we can observe how it affects the dependent variable (plant growth). The experimental group receiving fertilizer is expected to show greater plant growth compared to the control group without fertilizer. This allows us to draw conclusions about the effect of fertilizer on plant growth.

However, it is important to note that the specific outcome may vary depending on other factors such as plant species, soil conditions, and environmental factors. Conducting a controlled experiment while considering these factors helps in obtaining more reliable results.

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Answer:

8.24 mL

Explanation:

Density can be defined as mass per unit volume, according to the relationship shown in the attached image. Moles (a unit of measurement for small entities) can also be related to mass. Let's look at two formulas which would be useful for answering this question.

\(\boxed{\text{Density}=\frac{\text{Mass}}{\text{Volume}} }\)

\(\boxed{\text{Mole}\times\text{Mr}=\text{Mass (in grams)}}\) , where Mr stands for relative molecular mass

From the periodic table the Mr of nickel is 58.7.

Multiply the number of moles by the Mr:

Mass of Ni

= 1.25(58.7)

= 73.375 g

Calculate the volume of Ni:

Volume

= mass ÷density

= 73.375 ÷8.90

= 8.24 ml (3 s.f.)

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Answer:

Chemical Change

Explanation:

chemical bonds within the substance have been altered because a new substance has been produced. It cannot be a mixture because they do not involve changes in matter, it cannot be a physical change because they do not result in new substances, it is not a solution because those do not involve changes in matter.

Answer: Copper and Zinc --> Copper Sulphate is possible

Explanation:

Zn, Sn, Si, Al, and Ni serve as the primary alloying elements in copper alloys, which are alloys based on copper. Brasses (Cu-Zn) and bronzes (Cu-Sn), two copper-based alloys, are widely used in a variety of industrial and societal purposes.

Unless they have already claimed it, this person is not registered with ResearchGate. The normal copper content of aluminum-copper alloys ranges from 9 to 12%, with lesser additions of other components.

The copper significantly boosts strength and speeds up precipitation hardening. Aluminium's ductility and corrosion resistance may be affected by copper.

Therefore, It provides a weight percentage of the elements found in the produced oxides. Convert this weight percentage to a mole percentage to confirm the ratio in which the initial precursors were used to create the sample.

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The difference between Argon-38 and Argon - 45 is the number of neurons in their nuclei.

Isotopes are two or more types of atoms of the same element that have the same atomic number but differs in mass numbers due to different numbers of neutrons in their nuclei.

Argon atom with a mass number of 38 (Ar-38) - number of neutrons = 20

Argon atom with a mass number of 45 (Ar-45) - number of neutrons = 27

Thus, the difference between Argon-38 and Argon - 45 is the number of neurons in their nuclei.

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The element lithium has two naturally occurring isotopes. Lithium i.e. (Li) have a atomic mass of value 6.94 amu.

To calculate the atomic mass of lithium, we need to find the weighted average of the masses of its two isotopes based on their natural abundance. The formula for this calculation is:

\(Atomic mass = (mass of isotope 1 * abundance of isotope 1) + (mass of isotope 2 * abundance of isotope 2)\)

Putting values for two isotopes of lithium:-

\(Atomic mass = (6.0151 amu * 0.0749) + (7.0160 amu * 0.9251)\)

\(Atomic mass = 0.4497595 + 6.487676\)

\(Atomic mass = 6.937435 amu\)

Hence, the atomic mass of lithium is approx. 6.94 amu.

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Answer:

petroleum

Explanation:

usually found sedimentary rock.

definition: a liquid mixture of hydrocarbons that is present in certain rock strata and can be extracted and refined to produce fuels including gasoline, kerosene, and diesel oil, oil

Answer:

The order and arrangement of the planets and other bodies in our solar system is due to the way the solar system formed. Nearest the Sun, only rocky material could withstand the heat when the solar system was young. For this reason, the first four planets—Mercury, Venus, Earth and Mars—are terrestrial planets.

Explanation:

Answer:lonic

Explanation:A neutral atom has an equal number of electrons and protons. When an electron is lost, the atom becomes positively charged and is called a cation. On the other hand, when an electron is gained by an atom, it becomes negatively charged and is called an anion. The distance of the nucleus of an ion and the valence electron is referred to as the ionic radius.

Answer:

36C

Explanation:

jahdhfjjfbxndnskajdbdb

Waves have energy that causes particles in matter to vibrate, which is why they can transfer energy and heat through matter.

The frequency of a wave is a degree of what number of oscillations or cycles of the wave arise in a given time period. It is measured in hertz (Hz). The electricity of a wave is associated with its frequency in that the higher the frequency of the wave, the extra electricity it contains. This is due to the fact greater oscillations according to 2nd manner that extra electricity is being transferred in a given amount of time. So, waves with better frequency have more power than waves with decrease frequency. That is why waves with high frequency like X-rays and Gamma rays are considered dangerous as they create more energy and may reason ionization, even as waves with low frequency like Radio waves are less dangerous as they bring less energy.

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The two equivalents of benzaldehyde were used, and the desired product was dibenzalacetone  has the proton NMR signal is 5 signals.

The reaction of the  two equivalents of benzaldehyde with the acetone show the aldol condensation and form the product is dibenzalacetone.

the dibenzalacetone shows the following proton NMR signals:

proton a : 7.1 ppm , doublet = 1 proton

proton b : 7.8 ppm doublet = 1 proton

proton c : 7.5 ppm doublet = 2 protons

proton d : 7.4 ppm is the multiplet = 2 protons

proton e : 7.3 ppm multiplet

The chemical shifts are based on the protons chemical environment. the coupling constant is 12 Hz for the  olefinic hydrogens.

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The first step in the separation is to heat the ground up tablets to increase the solubility of caffeine in water. Heating the ground up tablets increases the solubility of caffeine in water because solubility is dependent on temperature.

As the temperature of the water increases, more solute can be dissolved in the solvent. Therefore, by heating the ground up tablets, the caffeine will dissolve more easily in the water, allowing for separation from other compounds present in the tablet.The solubility of caffeine in water at 25°C is only 2.2 mg/mL, which means that a large amount of water would be required to dissolve caffeine from the tablets. By heating the tablets to a higher temperature, such as 80°C or 100°C, the solubility of caffeine increases dramatically, making it easier to dissolve the caffeine in a smaller amount of water. This makes separation of the caffeine from other compounds more efficient.

Step 1: Heat the mixture
As the temperature of the water increases, the solubility of caffeine also increases. This means that more caffeine can dissolve in water at higher temperatures.

Step 2: Dissolve the caffeine
By heating the ground-up tablets, you are increasing the temperature of the water, allowing more caffeine to dissolve. This ensures that a larger amount of caffeine is separated from the other components in the tablet.

Step 3: Separate the caffeine
Once the caffeine is dissolved in the heated water, it can be more easily separated from the other components in the tablet, leading to a more efficient and effective separation process.

In conclusion, the first step in separating caffeine from ground-up tablets is to heat the mixture because it increases the solubility of caffeine in water, allowing for a more efficient separation process.

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Answer:

The oxidation number for sulfur in SO2 is +4.

Explanation:

To find the oxidation number of sulfur, it is simply a matter of using the formula SO2 and writing the oxidation numbers as S = (x) and O2 = 2(-2) = -4. Using the rule and adding the oxidation numbers in the compound, the equation becomes x +(-4 ) = 0. Solving for x, it is evident that the oxidation number for sulfur is +4.

Chemical reaction is the term which describes the conversion of substances into different substances.

Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.

There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

There are three types of chemical reactions:

1) inorganic reactions

2)organic reactions

3) biochemical reactions

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Temperature and pH can potentially affect the speed of Alka-Seltzer dissolving, with higher temperatures and lower pH levels likely increasing the dissolution rate. Salinity, on the other hand, generally has minimal impact.

The speed of Alka-Seltzer dissolving can be affected by temperature, pH, and salinity. Here's a brief explanation of their potential effects:

1. Temperature: Increasing the temperature typically enhances the rate of dissolution. Higher temperatures provide more thermal energy, leading to faster molecular movement and collisions, thereby increasing the dissolution rate of Alka-Seltzer.

2. pH: Alka-Seltzer contains citric acid and sodium bicarbonate, which react to produce carbon dioxide gas. pH can influence the rate of this chemical reaction. Lower pH levels (more acidic conditions) may accelerate the reaction, resulting in faster dissolution. However, extreme pH levels, particularly highly acidic or highly alkaline conditions, might have an adverse effect on the dissolution process.

3. Salinity: Salinity refers to the salt content in the surrounding solution. Salinity generally does not have a significant impact on the dissolution of Alka-Seltzer tablets. As long as the water used for dissolving Alka-Seltzer is not excessively saline, the presence of salts should not noticeably affect the dissolution rate.

It's important to note that these factors may interact with each other, and the specific composition and formulation of Alka-Seltzer can also influence the dissolution behavior. Experimental testing under different conditions would provide more accurate and detailed insights into how temperature, pH, and salinity affect the speed of Alka-Seltzer dissolving.

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Answer:

\(\sf\large\underline\purple{Fractional\: Distillation:-}\)

\(\rightarrow\)The process involves repeated distillations and condensations and the mixture is usually separated into component parts. The separation happens when the mixture is heated at a certain temperature where fractions of the mixture start to vaporize.

\(\rightarrow\)The basic principle of this type of distillation is that different liquids boil and evaporate at different temperatures. So when the mixture is heated, the substance with lower boiling point starts to boil first and convert into vapours.

\(\sf\underline\green{Applications\: Of\:Fractional\: Distillation:-}\)

________________________________

Hope it helps you:)

-4 for C in \(\rm (CH_{4})\) +4 for C in \(\rm CO_{2}\) +1 for H in both \(\rm CH_{4}\) and \(\rm H_{2}O\) are the oxidation numbers.

Oxidation numbers are the digits that indicate the number of electrons lost, gained, or shared so that a chemical bond is created with atom or atoms.

In methane, \(\rm (CH_{4})\) carbon donates four electrons as it is more electronegative than hydrogen and hence will have an oxidation state of -4.

The oxidation state of the carbon in \(\rm CO_{2}\) will be +4 as oxygen is more electronegative than the carbon and will donate an electron.

The oxidation state of the hydrogen will be +1 in both methane and water as the electronegativity of the hydrogen is smaller than both oxygen and carbon.

Therefore, options 1, 2 and 4 are correct.

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the molecular formula of the compound is (CH₂)₈, which simplifies to C₈H₁₆.

the molecular formula of a compound given its molar mass and empirical formula, we need to determine the factor by which the empirical formula must be multiplied to get the molecular formula.

The empirical formula CH₂ has a molar mass of approximately 14 (12 from C + 2 from H).

The factor by which we need to multiply the empirical formula to get the molar mass of 112 is 8 (112 /14 = 8).

The most straightforward whole-number ratio of the atoms in a compound is its empirical formula. In order to arrive at the smallest ratio possible, the subscripts in the chemical formula are divided by their greatest common factor.

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am not sure

Explanation:

1T

2T

3T

4F

5F

6F

7F

8T

9T

10T

Answer:

hope it helps

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Explanation:

An ion is a charged atom or molecule. It is charged because the number of electrons do not equal the number of protons in the atom or molecule. An atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

Answer:

In this reaction, 38.1 grams of copper will be produced.