Methylene Chloride (MC) is a common ingredient of paint removers. Besides being an irritant, it also may be absorbed through skin. When using this paint remover chemical protective clothing should be worn. If thick butyl rubber gloves (0.1 cm thick) are used, D in butyl rubber is 110 x 10-8 cm2/s, and surface concentrations are 0.44, and 0.02 g/cm3. If the surface of a glove is 50 cm2, the amount of MC transported through the glove in 3 hours will be: Answer in grams (g).

Answer:

A. Igneous Rocks

Explanation:

Hope i could help :)

Igneous rocks are formed from cooling molten rock.  

• One of the three main kinds of rocks along with metamorphic and sedimentary rocks are the igneous rocks, and they comprise both extrusive and intrusive rocks.  

• The formation of igneous rocks takes place when the molten rock cools and crystallizes, either when the melted rock is still within the crust, or at the volcanoes on the surface of the Earth.  

• The igneous rocks can possess several kinds of compositions, based on the magma they cool from.  

• The two prime categories of igneous rocks are intrusive and extrusive rocks.  

Thus, the correct answer is option A, that is, igneous.

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Answer:

All known vaccine molecules must be tested to find the right one.

Explanation:

I took the test

The application of force in the direction of the motion of an object. The second scenario involves applying force to a moving item that is traveling in the opposite direction.

A force is an influence that has the power to alter an object's motion. An object with mass can change its velocity, or accelerate, as a result of a force. A force has both a direction and a magnitude.

Force is used to describe a body's tendency to modify or change its state as a result of an external cause. When force is applied, the body can also alter its size, shape, and direction.

A push or pull that an object experiences as a result of interacting with another item is known as a force. Every time two items interact, a force is exerted on each of the objects. The force is no longer felt by the two objects when the interaction ends.

Thus, Force applied to an item in motion that originates in any direction constitutes the third situation where force is created.

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The temperature of a 1.7379 mole of a gas with a pressure of 1.4948 atm and volume of 92.202 L is 965.69K .

The temperature of a given gas can be calculated using the ideal gas law equation:

PV = nRT

Where;

1.4948 × 92.202 = 1.7379 × 0.0821 × T

137.82 = 0.142T

T = 137.82 ÷ 0.142

T = 965.69K

Therefore, the temperature of a 1.7379 mole of a gas with a pressure of 1.4948 atm and volume of 92.202 L is 965.69K.

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Two ways that the density can be used in a factor label method is given below:

The Factor-Label Method also known as the the Unit Factor Method is a problem-solving method that uses the fact that any number or expression can be multiplied by one without changing its value.

This process is known as Dimensional analysis.

Density is defined as the ration of mass and volume.

Density = mass/volume

Two ways that the density can be used in a factor label method is given below:

In conclusion, density of a substance is the ratio of mass and volume.

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Answer:

A. PbI2(s) ===> Pb2+(aq) + 2I-(aq)

B. Ksp = [Pb2+][I-]^2

C. 1.52 x 10^-3 M. It is equal to the moles/L of PbI2 that go into solution.

D. 2 x 1.52 x 10^-3 = 3.04 x 10^-3 M

E. Ksp = (1.52x10^-3)(2.31x10^-6) = 3.51 x 10^-9

Explanation:

In the given question, \(\rm PbI_2(s) \rightleftharpoons Pb^{2+}(aq) + 2I^-(aq)\) is the dissolution reaction of \(\rm PbI_2\) in water,   \(\rm Ksp = [Pb^{2+}][I^-]^2\) is expression for Ksp for \(\rm PbI_2\),  \(1.52\times 10^{-3 }\) mol/L is the concentration of \(\rm Pb^{2+ }\) in the equilibrium solution,  \(3.04\times 10^{-3}\) mol/L is the concentration of I- in the equilibrium solution and

\(1.40\times 10^{-8}\) is the solubility product of  \(\rm PbI_2\), respectively.

A reaction is a process that involves the transformation of one or more substances into one or more different substances.

1. The dissolution reaction of \(\rm PbI_2\) in water is:

\(\rm PbI_2(s) \rightleftharpoons Pb^{2+}(aq) + 2I^-(aq)\)

2. The expression for Ksp for \(\rm PbI_2\) is:

 \(\rm Ksp = [Pb^{2+}][I^-]^2\)

Where, \(\rm [Pb^{2+}]\) is the concentration of \(\rm Pb^{2+ }\) ions in solution and \(\rm [I^-]\) is the concentration of \(\rm I^-\) ions in solution.

3. The solubility of  \(\rm PbI_2\) is \(1.52\times 10^{-3 }\) mol/L. Since \(\rm PbI_2\) dissociates into one  \(\rm Pb^{2+ }\) ion and two \(\rm I^-\) ions, the concentration of  \(\rm Pb^{2+ }\) in solution is equal to the solubility of  \(\rm PbI_2\), which is \(1.52\times 10^{-3 }\) mol/L.

\(\rm [Pb^{2+}] = 1.52\times 10^{-3}\ mol/L\)

4. Since  \(\rm PbI_2\) dissociates into one \(\rm Pb^{2+ }\) ion and two  \(\rm I^-\) ions, the concentration of  \(\rm I^-\) ions in solution is twice the solubility of  \(\rm PbI_2\) .

\(\rm [I^-] = 2 \times 1.52\times 10^{-3 }\ mol/L\)

= \(3.04\times 10^{-3}\) mol/L

5. The solubility product of  \(\rm PbI_2\) can be calculated using the expression for Ksp and the concentrations of \(\rm Pb^{2+ }\) and  \(\rm I^-\) ions in solution.

\(\rm Ksp = [Pb^{2+}][I^-]^2\)

=  \(1.52\times 10^{-3 }\)  \(\times\) \(\rm (3.04\times 10^{-3} mol/L)^2\)

= \(1.40\times 10^{-8}\)

Therefore, the dissolution reaction of \(\rm PbI_2\) in water, expression for Ksp for \(\rm PbI_2\), the concentration of Pb2+ in the equilibrium solution, the concentration of I- in the equilibrium solution and solubility product of  \(\rm PbI_2\) is mentioned above.

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Some types of solids that are insoluble in water are:

Many solids are insoluble in water, meaning they do not dissolve in water to a significant extent. Here are some examples of common solids that are generally insoluble in water:

Metals: Most metals, such as gold, silver, platinum, and copper, are insoluble in water.

Non-Metallic Elements: Many non-metallic elements, such as carbon (in the form of graphite or diamond), sulfur, phosphorus, and iodine, are insoluble in water.

Metal Oxides: Some metal oxides, particularly those of less reactive metals, are insoluble in water. Examples include aluminum oxide (Al2O3), iron(III) oxide (Fe2O3), and lead(II) oxide (PbO).

Metal Carbonates: Most metal carbonates are insoluble in water. Examples include calcium carbonate (CaCO3), lead(II) carbonate (PbCO3), and copper(II) carbonate (CuCO3).

Metal Sulfides: Many metal sulfides are insoluble in water. Examples include lead(II) sulfide (PbS), silver sulfide (Ag2S), and mercury(II) sulfide (HgS).

Insoluble Salts: Certain salts have limited solubility in water. Examples include silver chloride (AgCl), lead(II) iodide (PbI2), and calcium sulfate (CaSO4).

It's important to note that while these solids are generally insoluble in water, they may exhibit some solubility to a small extent. The solubility of a solid in water can vary depending on factors such as temperature, pressure, and the presence of other solutes.

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The oxidation number of Ag in Ag2O is +1.

In Ag2O, there are two silver atoms (Ag) and one oxygen atom (O). Oxygen is known to have an oxidation number of -2 in most compounds. Since the compound is neutral, the sum of the oxidation numbers of all the atoms must equal zero.

Therefore, the oxidation numbers of the two silver atoms must add up to +2 to balance out the -2 oxidation number of the oxygen atom. Since there are two silver atoms, each silver atom must have an oxidation number of +1 to yield a total oxidation number of +2 for the compound.

In Ag2O, the silver atoms lose one electron each to form Ag+ ions. This results in an oxidation number of +1 for each silver atom. The oxygen atom gains two electrons from the silver atoms to achieve a stable octet configuration, resulting in an oxidation number of -2 for the oxygen atom. The compound Ag2O is formed through the transfer of electrons, with each silver atom exhibiting an oxidation number of +1.

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Answer:

weathering

Explanation:

This is typical erosion of rocks / soil etc caused by wind/rain/ice etc

Answer:

monkey see, monkey do

Explanation:

boom :)

Answer:

I think it's a game with me and I will knock out a bit and I hope you are u all the way you can get a little bit of a good time to come over here in a bit of the world

Answer:

Explanation:

Here, we want to select the process in which a solution of an acid react with a base to form salt and water

This process is called neutralization

It is the process by which solutions of an acid or a base react to form salt and water

The data the students could collect to confirm the type of reaction is the temperature before and after the reaction.

The system is the reaction vessel and the surroundings are the laboratory environment.

Chemical reactions are reactions in which new substances called products are formed from one or more substances that undergo chemical change called reactants.

During a chemical reaction, heat changes occur as the reactants form products. The heat changes that occur may involve the release of heat by the chemical system to the surroundings or the absorption of heat from the surrounding by the chemical system.

A reaction in which heat is absorbed will feel cold to touch and is called an endothermic reaction.

A reaction in which heat is released to the surroundings will feel hot to touch and is called an exothermic reaction.

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Subatomic particles include "Electrons", and those include the "heavier" building blocks of the nucleus of an atom, the electrically neutral neutrons and positively charged protons

\(\boxed{\boxed{\pink{\bf \leadsto This \ is \ an \ example \ of \ Chemical \ change .}}}\)

Reaction of sodium metal with water is a chemical change . Sodium reacts with water to form sodium hydroxide. This is also an example of exothermic reaction as heat is released in this process. Sodium reacts vigoursly with water , it even reacts with the moisture present in the air . So it is stored in kerosene oil .

The reaction of sodium with water is :-

\(\boxed{\red{ \bf \underset{\blue{Sodium}}{2Na} + \underset{\blue{Water}}{2H_2O} \longrightarrow \underset{\blue{Sodium\: Hydroxide}}{2Na(OH)}+ \underset{\blue{Hydrogen}}{H_2}}}\).

The reaction of sodium metal with water is a chemical change, as a result formation of sodium hydroxide occurs.

The following points to be noted for the reaction of sodium with water:

Therefore, the reaction of sodium with water is a chemical change.

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112g of ethene (\(C_{2}H_{4}\)) were produced in 40 seconds and the mean rate of reaction is 0.1 mol/s

To determine the mean rate of reaction, we need to calculate the change in the amount of ethene (\(C_{2}H_{4}\)) over the given time interval. We can use the stoichiometry of the reaction to relate the moles of ethene to the mass of ethene produced.

The balanced equation for the reaction of ethene (\(C_{2}H_{4}\)) can be written as:

\(C_{2}H_{4}\) -> products

From the equation, we can see that 1 mole of ethene (\(C_{2}H_{4}\)) produces 1 mole of products.

First, we need to calculate the number of moles of ethene produced:

Molar mass of \(C_{2}H_{4}\)= (2 × atomic mass of carbon) + (4 × atomic mass of hydrogen)

= (2 × 12 g/mol) + (4 × 1 g/mol)

= 24 g/mol + 4 g/mol

= 28 g/mol

Number of moles of ethene produced = mass of ethene / molar mass

= 112 g / 28 g/mol

= 4 mol

Next, we calculate the mean rate of reaction by dividing the moles of ethene produced by the time interval:

Mean rate of reaction = moles of ethene / time

= 4 mol / 40 s

= 0.1 mol/s

Therefore, the mean rate of reaction for the production of ethene is 0.1 mol/s.

This calculation involves determining the moles of ethene produced from the given mass of ethene and then dividing it by the given time interval to find the mean rate of reaction.

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Answer:

9.01 grams

Explanation:

~18.02 grams are in 1 mole of water so you'd divide that in half to get 9.01 grams.

Answer:

1. B

2. A

3. C

4. C

5. D

Explanation:

Soil is regarded as the solid unconsolidated material of the earth crust. Soil is of three different types namely: Sandy soil, clay soil and loamy soil. These three different soil types possess different properties that distinguish them. Some of them are:

- CLAY soil is characterized as having the finest particles and can hold greater amount of water i.e. have a high water holding capacity.

- LOAMY SOIL is the best soil type for planting agricultural crops because it has the highest concentration of nutrients that suited for plant growth.

- loamy, Sandy and clay differ in how we feel when touched i.e. texture, and colour.

- SANDY soils are the kind of soils that are found in Sea shores and beaches.

- Soil is important to living things as it forms part of the earth where animals live, provides the necessary nutrients needed by plants, serves as a place where people live.

Answer:

0.109 moles Al

Explanation:

To find the necessary amount of aluminum (Al), you need to (1) convert grams AlBr₃ to moles AlBr₃ (via molar mass from periodic table values) and then (2) convert moles AlBr₃ to moles Al (via coefficients from reaction). It is important to arrange the ratios in a way that allows for the cancellation of units. The final answer should have 3 sig figs because the given value (29.0) has 3 sig figs.

Molar Mass (AlBr₃): 26.982 g/mol + 3(79.904 g/mol)

Molar Mass (AlBr₃): 266.694 g/mol

2 Al(s) + 3 Br₂(l) --> 2 AlBr₃(s)

29.0 g AlBr₃           1 mole                  2 moles Al
------------------  x  ---------------------  x  -----------------------  = 0.109 moles Al
                             266.694 g            2 moles AlBr₃

The median reaction at the second end point in the HCl and NaOH titration is: HCl + NaOH → NaCl + H2O

In a titration between hydrochloric acid (HCl) and sodium hydroxide (NaOH), the reaction involved is the neutralization reaction between an acid and a base. The balanced equation for this reaction is:

HCl + NaOH → NaCl + H2O

In this reaction, one mole of HCl reacts with one mole of NaOH to form one mole of NaCl (sodium chloride) and one mole of water.

During the titration process, the reaction occurs gradually as the base is added to the acid solution.

The first end point of the titration is reached when the moles of HCl and NaOH are stoichiometrically equivalent, meaning they react in a 1:1 ratio. At this point, all the HCl has been neutralized by the NaOH, and no excess of either reagent remains.

However, if the titration is continued beyond the first end point, the reaction between HCl and NaOH can still occur, albeit in a different ratio.

The second end point refers to the point where the moles of NaOH added exceed the stoichiometrically required amount to neutralize the HCl completely. As a result, any excess NaOH added after the second end point reacts with the excess HCl in a 1:1 ratio.

Therefore, the median reaction at the second end point in the HCl and NaOH titration is:

HCl + NaOH → NaCl + H2O

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Answer:

outside nucleus

while protons and neutrons are inside.

Explanation:

The Safety Data Sheet (SDS) for regular bleach can be obtained from the manufacturer or supplier of the specific brand or product. It contains important information regarding the hazardous properties, handling, storage, and emergency procedures related to the bleach.

An SDS typically includes details such as the product's chemical composition, physical and chemical properties, potential hazards to health and the environment, precautionary measures for safe handling and storage, first-aid procedures, and information about proper disposal. It also provides guidance on personal protective equipment (PPE) to be used when handling the product and steps to take in case of accidental release or exposure.

The SDS serves as a crucial resource for understanding the potential risks associated with the use of regular bleach and helps ensure that appropriate safety measures are implemented. It is important to review and follow the information provided in the SDS to minimize the risk of accidents, injuries, or adverse health effects associated with the use of the product.

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Answer:

Meiosis

Explanation:

They just split in four.

The nucleus of an atom is positively charged and contains most of the mass if the atom.

An atom is the smallest particle of a an element that can take part in a chemical reaction.

Atoms are made up of other smaller sub-particles which are:

The protons and neutrons are found in the nucleus of an atom

The electrons are found regions around the nucleus.

Due to the positive charge of the protons, the nucleus of an atom are positively charged and is massive.

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Answer:

Tings that effect weather is basically the following:

Answer:

1.2 × 10²⁴ molecules NH₃

General Formulas and Concepts:

Chemistry

Explanation:

Step 1: Define

34 grams NH₃

Step 2: Define conversions

Avogadro's Number

Molar Mass of N - 14.01 g/mol

Molar Mass of H - 1.01 g/mol

Molar Mass of NH₃ - 14.01 + 3(1.01) = 17.04 g/mol

Step 3: Convert

\(34 \ g \ NH_3(\frac{1 \ mol \ NH_3}{17.04 \ g \ NH_3} )(\frac{6.022 \cdot 10^{23} \ molecules \ NH_3}{1 \ mol \ NH_3} )\) = 1.20157 × 10²⁴ molecules NH₃

Step 4: Check

We are given 2 sig figs. Follow sig fig rules.

1.20157 × 10²⁴ molecules NH₃ ≈ 1.2 × 10²⁴ molecules NH₃

Answer:

increasing the positive charge of the positively charged object and increasing the negative charge of the negatively charged object would make the oppositely charged objects attract each other more.

Answer:

Limiting factors of an ecosystem include disease, severe climate and weather changes, predator-prey relationships, commercial development, environmental pollution and more. An excess or depletion of any one of these limiting factors can degrade and even destroy a habitat.

Explanation:

The limiting factor of an ecosystem involve disease, weather change, climate change, environment pollution and more. An excess or depletion of any of these factor can destroy over habitat.

An ecosystem is define as a community or a group of living organisms that live together and are dependent on each other.

There are two main types of ecosystem.

Terrestrial ecosystem are land based ecosystem and interaction of biotic and abiotic component in the specific area.

Example- forest, grassland desert etc.

Aquatic ecosystem are ecosystem formed by surrounding water bodies. They are dependent on each other and their environment .

Example- lake, pond, river etc.

Thus ecosystem and their limiting factor have great impact on the level of organization.

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Answer: The shape lets you see a wide area but not blind everyone that is ahead of you though some vehicles are tall and do so anyways or are too close and the reflections make sure the light is brighter forward than to the sides so it can be more effective for seeing in the dark or even during storms.

Explanation: This is just what I know. :/

Answer: combustion

Explanation: When a compound burns in the presence of oxygen the reaction is called a combustion. Like most organic substances, hydrocarbons are combustible. The general reaction is given below. Organic Compound + O 2 (g) ! CO 2 (g) + H 2 O(g) + Heat=Energy (1)