the combustion of g benzoic acid increases the temperature of a bomb calorimeter by . calculate the heat capacity of this calorimeter.

Answer:

basic

Explanation:

because H is hydrogen

Answer:

1. Draw a pencil line across the filter paper, 1 - 2 cm from the bottom.

2. Use a pipette or capillary tube to add small spots of each ink to the line on the paper.

3. Place the paper into a container with a suitable solvent in the bottom. For example, water. Make sure the water level is below the pencil line.

4. Allow the solvent to move through the paper, but remove the chromatogram before it reaches the top.

5. Allow the chromatogram to dry.

Extras : preferably use a lid to prevent evaporation and use a pencil or any suitable device to prop the paper in place, make sure the sides of the paper doesn't touch the sides of the beaker.

The frequency : a) 7.5 x 10¹⁴ /s

Radiation energy is absorbed by photons

The energy in one photon can be formulated as

\(\large{\boxed{\bold{E\:=\:h\:.\:f}}}\)

Where

h = Planck's constant (6,626.10⁻³⁴ Js)

f = Frequency of electromagnetic waves  (/s or Hz)

f = c / λ

c = speed of light

= 3.10⁸  m/s

λ = wavelength

The wavelength(λ) of purple light is 400 x 10⁻⁹ m, so the frequency :

\(\tt f=\dfrac{c}{\lambda}\\\\f=\dfrac{3.10^8~m/s}{4.10^{-7}m}\\\\f=\boxed{\bold{7.5.10^{14}}/s}\)

Answer:

31

Explanation:

Given parameters:

Mass number  = 66

 Number of electrons  = 35

Unknown:

Number of electrons

Solution:

In an atom, the number of protons and electrons are the same. In ions, there is a difference between the two numbers.

For this problem, once we can find the number of protons, it is therefore the number of electrons.

 Mass number = number of protons + number of neutrons

  Insert the parameters and solve;

     66  = number of protons + 35

    Number of protons  = 66  - 35  = 31

So the number of electrons is 31

When it comes to separating atoms in a compound, chromatography, distillation, and filtration are not suitable methods.

This is because these methods are designed to separate mixtures based on their physical properties, such as boiling point or particle size, rather than breaking down compounds into their individual atoms. To separate atoms within a compound, more complex processes like chemical reactions or nuclear reactions are required.

These processes involve breaking the chemical bonds between atoms, resulting in the formation of new compounds or elements. So, in short, chromatography, distillation, and filtration cannot be used to separate atoms in a compound. Let me know if you have any more questions!

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Answer:

C Hope This Helped!

Answer:

Solutions with low pH have a sour taste.

Explanation:

Answer:

O begins to boil

Explanation:

When the vapor pressure of a liquid is equal to the atmospheric pressure, the liquid suddenly begins to boil.

Answer:

has no observable changes

Explanation:

The balanced version of the half-reaction that occurs in acidic solution for the reduction of NO3 to NO2 is:

NO3^-(aq) + 2H^+(aq) + 2e^- → NO2(g) + H2O(l)

In this reaction, NO3^- is reduced to NO2, and electrons (e^-) are gained. To balance the equation, we need to ensure that the number of atoms and charges are equal on both sides.

To balance the oxygen atoms, we add water (H2O) on the right side:

NO3^-(aq) + 2H^+(aq) + 2e^- → NO2(g) + H2O(l)

Next, we balance the hydrogen atoms by adding protons (H^+) to the left side:

NO3^-(aq) + 2H^+(aq) + 2e^- → NO2(g) + H2O(l)

Finally, we balance the charges by adding electrons (e^-) to the left side:

NO3^-(aq) + 2H^+(aq) + 2e^- → NO2(g) + H2O(l)

Now, the equation is balanced, with an equal number of atoms and charges on both sides. Therefore, the balanced version of the half-reaction for the reduction of NO3 to NO2 in acidic solution is given by the equation above.

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Answer:

C: Ability to react. Sorry if its wrong!

Explanation:

pH of a 6.5 × 10^-2 M solution of butyric acid is 6.07 and the calculation part is below.

The pH of a 6.5 × 10^-2 M solution of butyric acid can be calculated as follows:

Calculate the concentration of hydronium ions (H3O+) in the solution:

Butyric acid (HC4H7O2) is a weak acid, which means that only a small fraction of it dissociates into its ions in solution. The dissociation reaction can be represented as follows:

HC4H7O2 + H2O ⇌ H3O+ + C4H7O2-

The concentration of hydronium ions can be calculated using the acid dissociation constant (Ka) for butyric acid and the initial concentration of butyric acid:

Ka = [H3O+][C4H7O2-] / [HC4H7O2]

[H3O+] = Ka * [HC4H7O2] = 1.3 × 10^-5 * 6.5 × 10^-2 = 8.45 × 10^-7

Calculate the pH:

The pH of a solution is defined as the negative logarithm of the hydronium ion concentration:

pH = -log[H3O+] = -log(8.45 × 10^-7) = 6.07

So, the pH of a 6.5 × 10^-2 M solution of butyric acid is 6.07.

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The atomic mass of an element is not solely determined by the most abundant isotope but rather takes into account the relative abundance of all naturally occurring isotopes. Although the relative abundance of the 180 isotope of hafnium (Hf) may be the highest, it does not necessarily mean that the atomic mass will be close to 180.

Isotopes are variants of an element that have different numbers of neutrons in their atomic nuclei. The atomic mass of an element is calculated as the weighted average of the masses of its isotopes, taking into account their relative abundances. So, even if the 180 isotope is the most abundant, if other isotopes with lower masses are also present, they will contribute to lowering the overall atomic mass.

In the case of hafnium, it has multiple isotopes, including 174Hf, 176Hf, 177Hf, 178Hf, 179Hf, and 180Hf, with varying abundances. The atomic mass of hafnium is calculated by considering the masses and relative abundances of all these isotopes, resulting in an atomic mass that may differ from the mass of any single isotope. Therefore, the atomic mass of hafnium is not close to 180, despite the high relative abundance of the 180 isotope.

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Since you will want to keep the three small vials of vaccine cold ( between 2 and 8 degree Celsius) for up to 24 hours you will need an exothermic reaction.

An exothermic reaction can be defined as the reaction in which the energy is released in the form of heat. when we kept water in the freezer , water molecules releases the heat to the surroundings and tend to freeze to ice form.

Thus, Since you will want to keep the three small vials of vaccine cold ( between 2 and 8 degree Celsius) for up to 24 hours you will need an exothermic reaction.

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The four mole ratios are: 6 KOH / 2 K₃PO₄, 2 KOH / 1 Co₃(PO₄)₂,

1 K₃PO₄ / 1 Co₃(PO₄)₂, 1 Co(OH)₂ / 2 KOH.

Mole ratio refers to the ratio between the number of moles of two substances in a chemical reaction.

The given chemical equation is:

2 KOH + Co₃(PO₄)₂ → K₃PO₄ + Co(OH)₂

And the first mole ratio given is:

6 KOH / 2 K₃PO₄

To find the other mole ratios, we need to first balance the chemical equation. It is already balanced, so we can proceed to find the other mole ratios:

(2) 2 KOH / 1 Co₃(PO₄)₂

This ratio indicates that two moles of potassium hydroxide react with one mole of cobalt(II) phosphate.

(3) 1 K₃PO₄ / 1 Co₃(PO₄)₂

This ratio indicates that one mole of potassium phosphate is produced for every mole of cobalt(II) phosphate that reacts.

(4) 1 Co(OH)₂ / 2 KOH

This ratio indicates that one mole of cobalt(II) hydroxide is produced for every two moles of potassium hydroxide that react.

Therefore, the four mole ratios are:

(1) 6 KOH / 2 K₃PO₄

(2) 2 KOH / 1 Co₃(PO₄)₂

(3) 1 K₃PO4 / 1 Co₃(PO₄)₂

(4) 1 Co(OH)₂ / 2 KOH

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Correct question is:

KOH + Co₃(PO₄)₂ →

With the above balanced equation, make atleast four mole ratios ( one is done for you ):

\(\frac{6KOH}{2K3PO4}\)    -      -        -

Answer:

The person is Dmitri Mendeleev

Answer: 652.8 g of iron (III) oxide produced.

Explanation:

To calculate the amount of iron (III) oxide produced, we use the enthalpy change of the reaction to determine the amount of energy released and convert it to moles of Fe2O3 produced. Then, we multiply by the molar mass of Fe2O3 to obtain the mass of Fe2O3 produced. Using these calculations, we get 652.8 g of iron (III) oxide produced.

580.84 grams of iron (III) oxide will be produced when 4300 kJ of heat energy is released.

Given:

Enthalpy change (∆H) value: ∆H = -1652 kJ

Amount of heat energy released: 4300 kJ

From the balanced equation:

4Fe + 3O₂ → 2 Fe₂O₃

The molar ratio between Fe₂O₃ and ∆H is 2:1652 kJ.

To find the molar amount of Fe₂O₃ produced, the following calculation:

\(4300 \times \frac{2}{1652}\) = 5.20 mol Fe₂O₃

To convert this into grams, it is required to multiply the molar amount by the molar mass of Fe₂O₃:

5.20  × 2  × 55.85 = 580.84 g

Therefore, 580.84 grams of iron (III) oxide will be produced when 4300 kJ of heat energy is released.

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neon the answer as the electron arrangement is 2,8

Answer:

Released into the atmosphere

Explanation:

The carbon that the plant had been storing when it was alive, would be released upon death into the soil

Answer:

Plants add water to the atmosphere

Explanation:

Answer:

a. Mathematics

Explanation:

There are various scientific studies and their complexity is different from each other. The one study might be difficult for one student but the other student who has interest in the particular subject might find it easy and interesting. Mathematics is the study which involves lot of variables which increase its level of complexity. The scientist may stuck in solution for years due the complexity of the multiple variables.

The pH of a saturated solution of Zn(OH)2 is approximately 9. When Zn(OH)2 dissolves in water, it undergoes hydrolysis, releasing hydroxide ions (OH-) into the solution.

The hydroxide ions increase the concentration of OH- ions in the solution, making it basic. The pH scale ranges from 0 to 14, with 7 being neutral. Since the solution is basic, the pH will be greater than 7. Zn(OH)2 is a weak base, and its hydrolysis is not complete, resulting in a pH of around 9. In more detail, when Zn(OH)2 dissolves in water, it forms Zn2+ and OH- ions. The OH- ions, being a strong base, react with water to form more OH- ions, increasing the concentration of OH- in the solution. This leads to a basic pH. However, the hydrolysis of Zn(OH)2 is not complete, meaning not all of the Zn(OH)2 molecules dissociate into Zn2+ and OH- ions. Some Zn(OH)2 remains undissociated, contributing to the solution's slight acidity.

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More than 40 compounds in tobacco and tobacco smoke are option D: carcinogens.

The U.S. Food and Drug Administration created a list of dangerous and possibly toxic components in tobacco smoke and unburned tobacco in 2012; 79 of these substances are regarded as carcinogens. All tobacco products contain nicotine, a highly addictive substance that may be found in the tobacco plant itself.

While nicotine makes people addicted and keeps them using tobacco products, it is not the cause of the extreme danger associated with tobacco use. Numerous compounds are found in tobacco and tobacco smoke. It is this concoction of chemicals, not nicotine, that renders tobacco smokers susceptible to fatal illnesses.

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Answer:

As this sheet of water moves on and off the beach, it can “capture” and transport beach sediment back out to sea. This process, known as “longshore drift,” can cause significant beach erosion.

Answer: A Temperature of the solute

Explanation:

Answer:

It is a synonym for "life form". Organisms are classified by taxonomy into groups such as multicellular animals, plants, and fungi; or unicellular microorganisms such as protists, bacteria, and archaea. ... Fungi, animals and plants are examples of kingdoms of organisms within the eukaryotes.

So yes, it should

Explanation:

If a person's breathing passage were filled with helium instead of air, the frequency of their voice would increase.

The frequency of a person's voice is determined by the vibration of their vocal cords. When air passes through the vocal cords, they vibrate at a certain frequency, which produces sound. The speed of sound waves traveling through a medium depends on the properties of that medium. Helium is a gas that is less dense than air, and sound travels faster through helium compared to air. As a result, if a person breathes in helium, the increased speed of sound waves in their vocal tract would cause the vocal cords to vibrate at a higher frequency, resulting in a higher-pitched voice. This is the reason why inhaling helium is known to produce a temporary change in voice pitch, often described as a high-pitched or squeaky voice

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