A sample of gas is placed in a rigid container. If the original conditions were 320 torr and 400 K, what will be the pressure in the container at 200 K?
a. 160 torr
b. 640 torr
c. 250 torr
d. 760 torr

Explanation:

the sulfur ato is in group 6 of the periodic table. In order to become an ion the ato needs to gain 2 electrons so it has a full outer shell of electron and is stable. so the atom S goes to S2+ + 2e

Answer:

47.596008

Explanation:

Answer:

option c

Explanation:

as catalyst increases the reaction while activation energy is inversely proportional to rate of reaction, so option c is correct

The purpose of a catalyst to lower the activation energy of a reaction.

A type of chemical that, without becoming consumed by the process, speeding a chemical reaction or reduce the temperature as well as the pressure required to initiate one. The addition of a catalyst to speed up a reaction is known as catalysis.

The bare minimum additional energy needed by a reactive molecule to transform into a product is considered as activation energy.

The purpose of a catalyst is to lower the activation energy of a reaction.

Therefore, the correct answer will be an option (C).

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Interaction occurs when light goes into an object as heat energy is Absorbed light.

Absorbed light makes an object dark. Absorption of light is when the light is absorbed by the object and converts it into heat energy. The objects converts the wavelength of light into the larger wavelength of heat.  this makes the object warmer and produced energy. Absorption depends on the frequency of light that is transmitted. The wavelength of light defined as the distance between the the two successive troughs of the the light wave.

Therefore, Interaction occurs when light goes into an object as heat energy is Absorbed light.

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Answer:

Equal parts are needed to make glucose and oxygen. The excess oxygen is released into the air

Explanation:

This equation explains why having plants in your house is good.

Substances that heat up quickly normally have low specific heat capacities.

The specific heat capacity of a substance is the amount of energy required to raise the temperature of a given mass of the substance by one degree Celsius.

It is usually measured in joules per kilogram per degree Celsius (J/kgK).it is an important physical property of a material, as it determines the amount of energy required to change its temperature.

It is also useful for calculating the amount of energy required to heat or cool a given mass of the material. The specific heat capacity of a substance is related to its molecular structure and composition, as well as its phase.

For example, the specific heat capacity of liquids is generally higher than that of solids, and the specific heat capacity of gases is higher than that of liquids.

Additionally, the specific heat capacity of a substance can vary with temperature, pressure, and other environmental factors.

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Accommodating involves one party sacrificing their own interests to satisfy the other party's needs while collaborating involves both parties working together to find a mutually beneficial solution.

Conflicts can be quickly resolved and positive relationships between the parties involved by being accommodating. For instance, one student might decide to abandon their idea in favor of the other student's idea if two students in a group project have opposing opinions on how to approach a task. This can help the group get along better and avoid conflicts.

On the other hand, working together can result in creative answers that benefit both parties. When two people work together, they combine their distinctive perspectives and ideas, which can result in innovative solutions that neither party would have thought of on their own. For instance, if two students disagree on how to complete a group assignment, they can work together and combine their ideas to come up with a more thorough and workable solution.

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To draw the structure of compound 2, the given structure needs to be modified using the bicyclo and the single bond tool to interconvert between double and single bonds.

The final structure of compound 2 can be drawn by following these steps:

Step 1: First, we need to identify the given structure, which is shown below:

Given structure:

Step 2: Modify the given structure by following these steps:a. Remove the double bond between carbon 1 and 2b. Add a bicyclo between carbon 1 and 2c. Add a double bond between carbon 2 and 3, and also between carbon 4 and 5d.

Add two methyl groups on carbon 4e. Add a double bond between carbon 6 and 7, and also between carbon 8 and 9.f. Add two methyl groups on carbon 9 Modified structure:

Step 3: Now, use the single bond tool to interconvert between double and single bonds wherever required to get the final structure of compound 2.

Final structure of compound 2:Thus, the final structure of compound 2 can be drawn by modifying the given structure using bicyclo and the single bond tool to interconvert between double and single bonds.

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Answer:

of the Sun 4, 2, 6, 1, 5 and 3. Starting with the heat from the sun (4), the process of evaporation takes place (2). In this process, heat from the Sun evaporates water from the rivers, oceans, lakes, ice, and soil into water vapor.

Explanation:

True. Both magnesium and chromium have been studied for their potential role in reducing the risk of developing type 2 diabetes.

Magnesium may improve insulin sensitivity and glucose regulation, while chromium may enhance insulin activity and help regulate blood sugar levels. However, more research is needed to fully understand the impact of these minerals on diabetes risk.

Magnesium is involved in the regulation of glucose and insulin, while chromium improves insulin sensitivity.

Ensuring adequate intake of these minerals may help reduce the risk of developing type 2 diabetes.

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Answer:

Chlorophyll.

Explanation:

Chlorophyll is also why plants are green.

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Chloroplasts are the food producers of the cell. The organelles are only found in plant cells and some protists such as algae. Animal cells do not have chloroplasts. Chloroplasts work to convert light energy of the Sun into sugars that can be used by cells.

:)

The concentration of chloride ions in the solution is 0.012 mM.

To determine the concentration of chloride ions (Cl-) in the solution, we need to first calculate the number of moles of calcium chloride (CaCl2) that were dissolved in the solution. We can use the formula weight of calcium chloride, which is 110.98 g/mol:

=> 23.7 g CaCl2 / 110.98 g/mol

=> 0.214 moles CaCl2

Next, we need to determine the number of moles of chloride ions produced when the calcium chloride dissolves. Since calcium chloride is an ionic compound, it dissociates into its constituent ions when dissolved in water. For every mole of calcium chloride that dissolves, one mole of calcium ions (Ca2+) and two moles of chloride ions (Cl-) are produced.

So, the number of moles of chloride ions produced is twice the number of moles of calcium chloride that were dissolved:

0.214 moles CaCl2 * 2 moles Cl- / 1 mole CaCl2

=> 0.428 moles Cl-

Finally, to determine the concentration of chloride ions in the solution, we need to divide the number of moles of chloride ions by the volume of the solution. The volume of the solution can be calculated from its mass and density:

=> 375 g solution / 1.05 g/mL

=> 358.33 mL

Now we can calculate the concentration of chloride ions in moles per milliliter (mM):

=> 0.428 moles Cl- / 358.33 mL

=> 0.012 mM Cl-

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Option B. I and IV. ii. the stationary phase is non-polar and iv. the mobile phase is solventless and more polar than silica-gel.

The stationary phase is made up of silica-gel and it is polar and the mobile phase is less polar than this. Due to this difference in polarity, the organic compounds get separated with mobility with the mobile phase.

The desk-bound segment in chromatography is the one which does no longer circulate with the sample while the mobile section in chromatography is one that moves with the sample.​ ​ instance: ​ In Paper Chromatography:​ The paper strip acts as a desk-bound phase at the same time as the solvent act as a "mobile section" in paper chromatography. ​

Skinny layer chromatography is accomplished precisely as it says - the use of a skinny, uniform layer of silica gel or alumina covered onto a chunk of glass, metallic or rigid plastic. The silica gel (or the alumina) is the stationary segment.

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Disclaimer:- your question is incomplete, please see below for the complete question.

Which of the following statements about the stationary and mobile phases in thin-layer chromatography is (are) true? i. the stationary phase is made of silica gel. ii. the stationary phase is a non-polar solvent. iii. the mobile phase is water. iv. the mobile phase is solventless and more polar than silica-gel.

A. I and II

B. I and IV.

C. II and IV.

D. II and III.

The activities of chromatography adsorbents (stationary phases) such as silica and alumina are greatly affected by their water content. The most active adsorbents are those that contain the least amount of moisture.                       The reason why this is the case is given below:

Chromatography adsorbents: Chromatography adsorbents or stationary phases are the materials in a chromatography column that play a significant role in separating the components of a mixture. The stationary phase interacts with the analyte molecules to bind them selectively and separate them based on the different affinities for the stationary phase.

The importance of water content: Water content is essential for the activity of chromatography adsorbents. The water molecules participate in hydrogen bonding with the surface groups of the adsorbent, allowing for enhanced selectivity of adsorption.

However, a large amount of water reduces the activity of the adsorbent due to the following reasons:

1. The presence of too much water can cause the polar and nonpolar properties of the adsorbent surface to be weakened, making it less active .

2.The polar groups on the adsorbent surface become saturated with water, making it more difficult to interact with the solute molecules and limiting the capacity of the adsorbent for adsorption.

3. The polar properties of the solute molecules are also reduced by the presence of excess water, reducing their affinity for the adsorbent.

Therefore, the most active adsorbents are those that contain the least amount of moisture.

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The elements with the highest density are found in the metals group of the periodic table, specifically in the late transition metals and the rare earth elements.

These elements have a high atomic number in periodic table, which means that they have a large number of protons in their nuclei, and therefore a high number of neutrons as well. As a result, they have a high atomic mass and a high density.

Some examples of elements with high density include:

Platinum (Pt)

Gold (Au)

Mercury (Hg)

Tantalum (Ta)

Tungsten (W)

Germanium (Ge)

Cerium (Ce)

It's worth noting that the density of an element can also be affected by its crystal structure, as different crystal structures can have different densities.  

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Correct Question:

in what area of the periodic table would the elements with the highest density be found?

The amount of NH4Cl that will precipitate out when the solution is cooled from 70°C to 50°C cannot be determined without information about the solubility of NH4Cl at those temperatures. Generally, as the solution cools, some NH4Cl is expected to precipitate due to its decreasing solubility.

To determine the amount of NH4Cl that will precipitate out when the solution is cooled, we need to compare the solubility of NH4Cl at the initial temperature (70°C) and the final temperature (50°C).

The solubility of NH4Cl generally decreases as the temperature decreases, which means that more NH4Cl will precipitate out as the solution cools.

However, to accurately determine the exact amount of NH4Cl that will precipitate, we need to know the solubility data for NH4Cl at different temperatures. Without this information, it is not possible to provide a specific value for the amount of NH4Cl that will precipitate.

In general, when a saturated solution of NH4Cl is cooled, some NH4Cl will likely precipitate out of the solution. The exact amount will depend on the solubility of NH4Cl at the given temperatures.

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Answer:

e.pressure increases

Explanation:

Recall that we define temperature as a measure of the average kinetic energy of the molecules in a body.

For a given mass of gas defined by pressure, volume and temperature, adjustments in volume and temperature will affect the pressure of the gas.

When the volume is decreased, more gas molecules are enclosed in a small place, they tend to collide more frequently with the walls of the container thereby increasing the pressure of the gas.

Increasing the temperature of the gas increases the kinetic energy of the gas molecules hence they collide even faster with the walls of the container thereby increasing the pressure of the given mass of gas.

Answer:

Sodium chloride in MSA acts as an electrolyte to conduct electricity and facilitate the movement of ions in the solution.

Explanation:

Sodium chloride, or NaCl, is often used in MSA (Methanol-Sulfuric Acid) as a reaction promoter or catalyst. MSA is a strong acid that can protonate molecules, allowing for reactions that may not occur under normal conditions. However, MSA can be slow to initiate certain reactions, so NaCl is added to help speed up the process.

When NaCl is added to MSA, it forms a complex with the sulfuric acid, making it a more effective protonating agent. This allows for more efficient protonation of the reactant molecules and can accelerate the reaction rate. Additionally, NaCl can help to minimize side reactions that can occur during the reaction process.

Overall, the addition of NaCl in MSA reactions can improve the reaction rate and selectivity, leading to more efficient and effective chemical transformations.

Answer:

The sodium chloride in MSA ensures that only Staphylococci species survive due to the high salt concentration. This eliminates all other gram-positive microbes. Further, we can confidently identify Staphylococcus aureus in MSA because it is the only type of Staphylococci species that can ferment mannitol in MSA.

Answer:

hydroxide and hydrogen

Explanation:

When a metal reacts with water, a metal hydroxide and hydrogen are formed. Sodium reacts vigorously with water.

Answer: Hydrogen Gas ( H2)

Explanation: When metals react with water they form hydrogen gas which actually react and start to burn and make squeaky pop noises.

Answer:

A. force is the ability to change an objects motion

Explanation:

sana po makatulong

Answer:

In a laboratory, a solution of sulfuric acid (H2SO4) was reacted with another of sodium hydroxide (NaOH), both aqueous. To form sodium sulfate (Na2SO4) and 2 molecules of liquid water (H2O). Complete in relation to the chemical equation that represents the reaction:

Explanation:

The balanced chemical equation of the reaction is:

\(H_2SO_4(aq)+2NaOH(aq)-> Na_2SO_4(aq)+2H_2O(l)\)

Thus, one mole of sulfuric acid reacts with two moles of sodium hydroxide.

Atmospheric oxygen is closely linked to the carbon cycle through the process of photosynthesis and respiration.

During photosynthesis, plants and other photosynthetic organisms use carbon dioxide (CO₂) from the atmosphere, along with sunlight and water, to produce glucose (C₆H₁₂O₆) and oxygen (O₂) as a byproduct. This process removes carbon dioxide from the atmosphere and releases oxygen, contributing to the oxygen content in the atmosphere.

On the other hand, during respiration, organisms, including plants, animals, and microorganisms, use oxygen from the atmosphere to break down glucose and release carbon dioxide as a waste product. This process releases carbon dioxide into the atmosphere and consumes oxygen.

Hence, the atmospheric oxygen is linked to the carbon cycle.

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Answer:

True

Explanation:

In general, metals are located on the left of the periodic table. Nonmetals are on the right. This means that they are on opposite sides.  So the answer is True.

The molecular geometry of C₂H₂ is linear and trigonal planar. The correct answer is D.

C₂H₂ has two carbon atoms with a triple bond between them. Each carbon atom also has one hydrogen atom attached to it. According to VSEPR theory, the electronic geometry of C₂H₂ is linear and trigonal planar because the two carbon atoms are bonded together by a triple bond, and the two hydrogen atoms are at the ends of the linear structure.

The linear and trigonal planar geometry arises due to the sp hybridization of the carbon atoms in C₂H₂. Each carbon atom uses one of its 2s orbitals and one of its 2p orbitals to form two sp hybrid orbitals that point in opposite directions. These two hybrid orbitals then overlap to form the triple bond between the carbon atoms.

The remaining two sp hybrid orbitals on each carbon atom form single bonds with one hydrogen atom each, giving a linear and trigonal planar structure. Hence, D is the correct option.

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The pairs of atoms that would be expected to make covalent bonds are: Carbon and chlorine,  Hydrogen and oxygen. Option b and Option c are correct.

Covalent bonds are formed when atoms share electrons to achieve a stable electron configuration. In the given pairs of atoms: Calcium and nitrogen: Calcium (Ca) is a metal, while nitrogen (N) is a nonmetal. Metal and nonmetal combinations typically form ionic bonds rather than covalent bonds.

Carbon and chlorine: Both carbon (C) and chlorine (Cl) are nonmetals. Nonmetals often form covalent bonds by sharing electrons to complete their valence electron shells. Therefore, carbon and chlorine are expected to form covalent bonds.

Hydrogen and oxygen: Hydrogen (H) and oxygen (O) are both nonmetals. They can form covalent bonds, as hydrogen can share its electron with oxygen to achieve a stable electron configuration.

Sodium and bromine: Sodium (Na) is a metal, while bromine (Br) is a nonmetal. Metal and nonmetal combinations typically form ionic bonds rather than covalent bonds. Thus, Option b and c are correct.

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Answer:

d

Explanation:

it is the smallest

Okay, let's solve this step-by-step without using quadratics:

1) The equilibrium constant Kc = 0.36 means the equilibrium lies to the left. So there will be more N2O4 than NO2 at equilibrium.

2) The initial concentration of N2O4 is 0.1 mol dm^-3. Let's call this [N2O4]initial.

3) At equilibrium, the concentrations of N2O4 and NO2 will be [N2O4]equil and [NO2]equil respectively.

4) We know the equilibrium constant expression for this reaction is:

Kc = ([NO2]equil)^2 / [N2O4]equil

5) Setting this equal to 0.36 and plugging in 0.1 for [N2O4]initial, we get:

0.36 = ([NO2]equil)^2 / (0.1 - [NO2]equil)

6) Simplifying, we get:

0.036 = [NO2]equil^2

7) Taking the square root of both sides, we get:

[NO2]equil = 0.06 mol dm^-3

So the equilibrium concentration of NO2 is 0.06 mol dm^-3.

Let me know if you have any other questions! I can also provide a more step-by-step explanation if needed.

To determine the mass percent of chloride in the original sample, we need to first calculate the amount of chloride present in the sample. We can do this by using the balanced equation for the reaction between chloride and silver nitrate:

AgNO3 + Cl- → AgCl + NO3-

First, we need to calculate the number of moles of silver nitrate used in the titration:

moles of AgNO3 = volume (L) x molarity (M) = 0.03083 L x 0.7890 M = 0.02439 moles

Next, we can use the balanced equation to find the number of moles of chloride:

moles of Cl- = moles of AgNO3 = 0.02439 moles

Finally, we can use the number of moles of chloride to calculate the mass of chloride in the sample:

mass of Cl- = moles of Cl- x molar mass of Cl- = 0.02439 moles x 35.5 g/mol = 0.868 g

To find the mass percent of chloride in the original sample, we divide the mass of chloride by the total mass of the sample and multiply by 100%.

mass percent of Cl- = (mass of Cl- / total mass of sample) x 100%

Since we don't know the total mass of the sample, we can use the mass of chloride we just calculated and the formula above to find the mass percent of chloride in the original sample.

mass percent of Cl- = (0.868 g / 0.1599 g) x 100% = 54.3%

So, the mass percent of chloride in the original sample is 54.3%.

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