Why did the toads disappear

Answer:

Answers explained below in detail.

Explanation:

In general, notice how they show you how to find the current state of matter (phase) for CO2. That line shows that at the intersection of the temperature and pressure (think of it as a coordinate of (T, P)), it is resting on the line between solid and gas.

For question 1, it asks us to first examine what phase the CO2 would be at a certain pressure and temperature. Basically, just plot the coordinate. It is at -100 C, and 1 atm pressure. A file is attached for what this looks like. Where those two data points intersect is the current phase. That would be the solid phase at -100 C and 1 atm pressure. That's actually what dry ice is, solid CO2 :). Then, we go to room temperature. We now find the coordinate at the same pressure,  but at room temperature, which is about 68 F, or 20 C. That point is also shown in the file. Notice that the intersection point is in the gas phase now. Going from a solid to a gas directly is called sublimation. That is what that smoke is that dry ice produces, essentially.

Unfortunately, since you didn't provide a phase diagram for water, you'll have to try the rest yourself.

For 5, though, the critical point is the point that ends the graph, shown in the file as well. Hope this helps.

A. To calculate the number of moles of hydrogen produced from 11.5g of sodium, we will use the balanced chemical equation: 2Na + 2H2O = 2NaOH + H2.

First, find the moles of sodium used:
1. Calculate the molar mass of sodium (Na): 22.99 g/mol
2. Divide the mass of sodium by its molar mass: 11.5g / 22.99 g/mol = 0.5 mol
Next, use the stoichiometry of the balanced equation:
3. For every 2 moles of sodium, 1 mole of hydrogen is produced.
4. Calculate the moles of hydrogen: 0.5 mol Na * (1 mol H2 / 2 mol Na) = 0.25 mol H2

B. To calculate the number of grams of hydrogen produced from 0.25 moles of hydrogen, we will use the molar mass of hydrogen.

1. Calculate the molar mass of hydrogen (H2): 2 * 1.008 g/mol = 2.016 g/mol
2. Multiply the moles of hydrogen by its molar mass: 0.25 mol H2 * 2.016 g/mol = 0.504 g H2

In summary, 0.25 moles of hydrogen will be produced from 11.5g of sodium, and this corresponds to 0.504 grams of hydrogen.

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a) Mg is oxidized and O2 is reduced

b) Zn is oxidized while Pb(NO3)2 is reduced.

Oxidation is defined as:

Reduction is defined as:

Looking at the first reaction, the Mg atom gains oxygen to become MgO. This means that Mg is oxidized. The oxidizing agent is O2. At the same time, O2 is being reduced and the reducing agent is Mg.

For the second reaction, the oxidation number of Pb is reduced from +2 to 0. Thus, Pb has been reduced by Zn while Zn itself has been oxidized. The reducing agent here is Zn while the oxidizing agent is Pb(NO3)2.

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A down arrow (↓) or (s) are symbols that are used to represent the precipitation product produce in the reaction.

AgNO3 (aq) + KCl (aq) → AgCl (s) + KNO3(aq)

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Answer:

Explanation:

As organisms release energy during cellular respiration, carbon dioxide is produced from the carbon in energy storage molecules. ... Carbon dioxide in the biodome decreased because decomposers decreased which means there was a decrease in cellular respiration overall.

Therefore, the mass of 9.03 x 10^23 atoms of S is approximately 48.11 g.

So, the answer is (B) 48.1 g S.

What is Molar Mass?

Molar mass is the mass of one mole of a substance, usually expressed in grams per mole (g/mol). It is calculated by adding up the atomic masses of all the atoms in a molecule. Molar mass is a useful concept in chemistry because it allows chemists to convert between mass, moles, and number of particles.

To find the mass of 9.03 x 10^23 atoms of S, we first need to find the number of moles of S in 9.03 x 10^23 atoms:

1 mole of S contains 6.022 x 10^23 atoms of S (Avogadro's number).

So, the number of moles of S in 9.03 x 10^23 atoms of S is:

9.03 x 10^23 atoms / 6.022 x 10^23 atoms/mol = 1.50 mol

Next, we can use the molar mass of S to convert moles to grams:

1.50 mol x 32.07 g/mol = 48.11 g

Therefore, the mass of 9.03 x 10^23 atoms of S is approximately 48.11 g.

So, the answer is (B) 48.1 g S.

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A and B are the reactants and the potiential energy is 40kj

just read from the graph

Explanation:

least= Li,F,N,He,Ca,O

medium=N,Br,K,Ne,Zn,Fr

most= F,I,K,Kr,Br,Ga

Hi there, here's your answer:

The equilibrium constant of a reaction, is the ratio of the molar concentration of products to the reactants raised to the power of their stoichiometric coefficients. In a balanced chemical equation, it is constant at a given temperature.

It is denoted as \(k_{c}\)

Example:

For a reaction Aa + Bb -> Cc + Dd
Where a and b are the reactants, c and d are the products and A, B, C and D are their respective stoichiometric coefficients, the equilibrium constant for the following reaction would be:

\(\frac{[a]^{A}[b]^{B} }{[c]^{C}[d]^{D} }\)

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The ph must be close to neutral for phospholipids to spontaneously form bilayers in an aquatic environment.

What is phospholipid bilayer?

Important elements of cell membranes are phospholipid bilayers. A barrier preventing molecules and ions from entering and leaving the cell is the lipid bilayer. The ability to selectively permit the passage of specific molecules into and out of cells, however, is a crucial function of the cell membrane.

A polar membrane that has two layers of lipid molecules makes up the lipid bilayer. All cells are surrounded by these membranes, which are flat sheets.

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Answer:

Pb (Lead) = 1 atom

N (Nitrogen) = 2 atoms

O (Oxygen) = 6 atoms

Explanation:

Here, we want to get the number of moles of each element present in the given compound

Firstly, we list out the elements

Pb -Lead

N-Nitrogen

O-oxygen

We have 1 mole of lead clearly

For nitrogen, we multiply the subscript outside with the subscript inside. If the inner subscript is missing, we replace by 1

Thus, nitrogen has a total 2 * 1= 2 atoms

Oxygen follows same pattern as nitrogen and we have 2 * 3 = 6 atoms

We can make use of the fact that the total pressure of the mixture is the same as the sum of the partial pressure of all the gases in the container. As a result, 400 kPa is the third gas' partial pressure.

The overall pressure exerted by a mixture of gases is equal to the sum of the partial pressures of each of the constituent gases, according to Dalton's law of partial pressures. The partial pressure is the pressure that each gas would have if it occupied the same volume of the mixture at the same temperature on its own.

Mathematically, this can be stated as:

P_total = P_1 + P_2 + P_3

When we plug these figures into the formula, we get:

800 kPa = 100 kPa + 300 kPa + P_3

When we simplify this equation, we obtain:

800 kPa = 400 kPa + P_3

By taking away 400 kPa from both sides, we arrive at:

P_3 = 400 kPa

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Temperature and molecular motion is a)directly proportional to each other. On increasing temperature,molecular motion also increases. So, correct option is a.

Molecular motion is characterized as the development of constituent particles or particles in a specific heading. The Molecular motion are impacted by intensity and temperature. This is on the grounds that temperature is the estimation of the typical dynamic energy of the atoms and addresses the movement of particles.

Essentially, heat moves energy among constituent particles that increment the motor energy of atoms. The numerical connection between active energy and temperature can be displayed underneath;

E = kT

where, E=Energy, k=boltzmann steady, T=temperature

The various kinds of molecular motion are

Translational movement: In such sort of movement, particles can move starting with one spot then onto the next in the equivalent or different bearing yet consistently stays on a similar hub.

Rotational movement: In this sort of movement, the particle can turn in and around the pivot.

Vibrational movement: In this kind of movement, particles can vibrate at their mean position. These movements are extremely normal in strong state.

Electronic movement: In this kind of movement, electrons can move from one spot to another and orbital to orbital. Electronic movements cause an adjustment of the shade of substances.

Hence,correct option is a.

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(Complete question) is:

what is the relationship between temperature and molecular motion?

a)directly proportional to each other

b)inversely proportional to each other

c)both directly and indirectly to each other

d)exponential proportional to each other

Answer: 2 moles

Explanation:

AM of Al 27

If an individual performed 5,000 foot-pounds of work in 1 minute, the amount of work accomplished would be 6.78 kilojoules (kJ).

This can be calculated by dividing the foot-pounds by 737.56, which is the number of foot-pounds in 1 kilojoule.

When it comes to calculating the amount of work done, it is important to use the equation W = Fd, which stands for work equals force multiplied by distance.

This equation can be used to calculate the amount of work done, and then the amount of energy transferred, when a force is applied over a certain distance. In the case of the individual performing 5,000 foot-pounds of work in one minute, the amount of work done can be calculated by multiplying 5,000 foot-pounds by the number of feet in one minute, which is 60. This will give a result of 300,000 foot-pounds of work done in one minute. To convert this to kilojoules (kJ), the result is then divided by 737.56, which is the number of foot-pounds in one kilojoule. This will give the result of 6.78 kilojoules (kJ) of work done in one minute.

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Answer:

3790 mL

Explanation:

3.79 L is equal to 3.79 × 1000mL = 3790 mL

According to the balanced chemical equation, it takes 1 mole of Ba(OH)₂ to neutralize 2 moles of HBr.

2 HBr + Ba(OH)₂ → BaBr₂ + 2 H₂O

From the balanced equation, we can see that the stoichiometric ratio between HBr and Ba(OH)₂ is 2:1.

Let's calculate the volume of Ba(OH)₂:

Molarity of HBr = 2.709 M

Volume of HBr = 98.8 ml = 0.0988 L

Molarity of Ba(OH)₂ = 0.7 M

Volume of Ba(OH)₂ = ?

Using the stoichiometric ratio, we have:

(2.709 M) × (0.0988 L) = (0.7 M) × (Volume of Ba(OH)₂) × 2

Volume of Ba(OH)₂ = (2.709 M × 0.0988 L) / (0.7 M × 2)

Volume of Ba(OH)₂ ≈ 0.1959 L

≈ 195.9 ml (rounded to 1 decimal place)

Therefore, approximately 195.9 ml of 0.7 M barium hydroxide would be required to neutralize 98.8 ml of 2.709 M hydrobromic acid.

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Answer:

Lithium chloride react with sulfuric acid to produce lithium hydrosulfate and hydrogen chloride. ... Lithium chloride - solid. This reaction takes place at a temperature near 50°C.

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Answer:

it changes in hydrogen chloride and sodium sulfate

Answer:

The balanced reaction for the decomposition of baking soda is

2 NaHCO3(s) → Na2CO3(s) + CO2(g) + H2O(g)

We can find the heat of reaction by using the Hess' Law. This is done by using this formula:

∑(Hf,products) -∑(Hf,reactants) = Heat of reaction

where Hf is the heat of formation. According to literature, these are the heats of formation for each of the compounds in the reaction:

NaHCO3: -947.68 kJ/mol

Na2CO3: -1130.94 kJ/mol

CO2: -393.51 kJ/mol

H2O: -241.8 kJ/mol

Applying Hess' Law:

[1(-1130.94) + 1(-241.82)] + 1(-393.51)] - [2(-947.68)] = 129.09 kJ

Thus, the heat of reaction is 129.09 kJ/mol NaHCO3. Since there is 1.96 mol of NaHCO3, the total heat of reaction is 253.02 kJ

Explanation:

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Answer:

d but I may be wrong

Explanation:

Answer: C. The electrode where reduction occurs.

Answer:

A substance that tends to bring about oxidation by being reduced and gaining electrons

Explanation:

Answer:

An oxidizing agent is a substance that takes negatively charged electrons "away" from a substance or object; usually taking these electrons for itself it can also transport the electrons from an object and "give" them to another substance or object. The object that has been oxidized will then have a positive charge after losing the negative electrons and the substance receiving the electrons will become negative.

Explanation:

Examples include halogens, potassium nitrate, and nitric acid.

An emulsion is a mixture of two immiscible liquids, meaning they do not mix easily, such as oil and water. Brine, can help with the formation and stabilization of an emulsion.

In an emulsion, one liquid, called the dispersed phase, is distributed as small droplets throughout the other liquid, called the continuous phase. This distribution is usually achieved by the use of an emulsifying agent, which helps stabilize the emulsion by reducing the surface tension between the two immiscible liquids. Brine, is a highly concentrated salt solution. When added to the mixture, brine can influence the properties of the continuous phase by increasing its density and viscosity.

This results in a more stable emulsion as the droplets of the dispersed phase are less likely to coalesce or separate. Moreover, the presence of salt in the brine can also act as an electrolyte, modifying the interfacial tension between the two immiscible liquids. This change in interfacial tension can help to stabilize the emulsion, preventing the dispersed phase droplets from merging and the emulsion from breaking.

In summary, an emulsion is a mixture of two immiscible liquids, such as oil and water, where one is dispersed as small droplets throughout the other. Brine can assist in emulsion formation and stabilization by altering the density, viscosity, and interfacial tension of the mixture, resulting in a more stable emulsion.

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Answer:

Explanation:

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Answer:

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AnswerDo you have a picture of the chart

Explanation: