A sample of polystyrene, which has a specific heat capacity of 1.880 J.g .°C , is put into a calorimeter (see sketch at right) that contains 300.0 g of water. The polystyrene sample starts off at 94.9 °C and the temperature of the water starts off at 22.0 When the temperature of the water stops changing it's 27.7 °C. The pressure remains constant at 1 atm. Calculate the mass of the polystyrene sample.

The molarity of a solution containing 8.00 grams of magnesium nitrate in 500.00mL of water is 0.108M.

Molarity is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution.

The molarity of a solution is determined by dividing the number of moles in the solution by the volume as follows:

Molarity = no of moles ÷ volume

According to this question, 8 grams of magnesium nitrate solution is dissolved in 500mL of water. The number of moles of the magnesium nitrate is as follows;

no of moles = 8g ÷ 148.3 g/mol

moles = 0.054 mol

molarity = 0.054mol ÷ 0.5 = 0.108M

Therefore, 0.108M is the molarity of the solution.

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The hypothesis is that these values are the fraction of atoms that are still radioactive after n half-life cycles. A= 0.5, B = 0.25 , C = 0.125, D = 0.015625 and E = 0.00390625.

The term half life of a substance is defined as the interval of time required for one-half of the atomic nuclei of a radioactive sample to decay.

"n" represents the number of half lives.

The amount of substance that remains after n half lives can be calculated using the given formula as follows:

So when we have n = 1,

Fraction of substance that remains = 0.5¹ = 0.5.

That means after first half life over, the amount of substance that remains is 0.5 times that of original.

Then, we have A = 0.5

When n = 2, we have 0.5² = 0.25

So, when 2 half lives are over, the amount of substance that remains is 0.25 times that of the original.

Then, B = 0.25

When n = 3, we have 0.5³ = 0.125

So when 3 half lives are over, the amount of substance that remains is 0.125 times that of the original.

Therefore, we have

C = 0.125

When n = 6 , we have

0.5⁶ = 0.015625

So D = 0.015625

When n = 8, we have 0.5⁸ = 0.00390625

Therefore, E = 0.00390625

Thus, the values for A, B, C, D and E are 0.5, 0.25, 0.125, 0.015625 and 0.00390625 respectively.

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Answer: Oxidation is gain of electrons so charge goes down. Ni2+ goes to Ni0 so Ni2+ is answer

Explanation:

O₂ and N₂ molecules will contain a node, or nodal plane, along the inter-nuclear axis.

Node is a place where there is no chance of detecting an electron, also known as a zero probability node. The terms "node" and "radial node" refer to two different sorts of nodes.

Angular nodes and nodal planes are synonyms. Nodal planes are those travelling through the nucleus where there is no chance of encountering an electron. An orbital's azimuthal quantum number equals the number of nodal planes in the orbital.

As, in O₂ and N₂ (2p -2p) overlap is there, so there is chance of forming a node or nodal plane in the inter-nuclear axis.

Thus, O₂ and N₂ molecules will contain a node, or nodal plane, along the inter-nuclear axis.

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The link between the reactant concentration and the reaction rate is known as the rate law in chemistry. Rate = K X, where K is the constant variable known as RATE CONSTANT, is the expression for the rate law.

How do you define reaction?

Resistance or disagreement to a source, influence, of movement is referred to as reaction, pronounced re-ak-shn. especially: a reaction to a particular treatment, circumstance, or stimulus; leaning toward a past and typically antiquated political or social system or policy.

Chemical Response: Chemical reactions are the processes by which a substance of substances change chemically to create a new substance or things with entirely new attributes. Different in terms of both product nature and identity.

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To determine how many mL of 1.5 M HCl solution should be used to provide 19.1 grams of HCl, we can use the following formula:

Molarity = moles of solute / liters of solution

We know the molarity of the solution (1.5 M) and the number of moles of HCl needed (19.1 grams / molar mass of HCl). Therefore, we can solve for the number of liters of solution needed:

19.1 grams HCl / (1.5 M) x (1 mole HCl / 36.5 g) = 0.5205 liters of solution

To convert liters to milliliters, we multiply by 1000:

0.5205 liters x 1000 mL/liter = 520.5 mL

Therefore, you should use 520.5 mL of 1.5 M HCl solution to provide the 19.1 grams of HCl required for the reaction.

Explanation: The rate law for a chemical reaction is an equation that relates the rate of the reaction to the concentrations of the reactants. To determine the rate law for a reaction, experiments are typically conducted with different initial concentrations of the reactants and the initial rate of the reaction is measured.

From the data provided, it appears that the reaction is of the form X + Y → C. And the concentration of X and Y are varied in three trials and the corresponding Initial rate is measured.

In the first trial, [X] = 0.01 M and [Y] = 0.015 M, and the initial rate of the reaction is 7.83x10-5 M/s.

In the second trial, [X] = 0.01 M and [Y] = 0.03 M, and the initial rate of the reaction is 3.13x104 M/s.

In the third trial, [X] = 0.02 M and [Y] = 0.015 M, and the initial rate of the reaction is 1.57x10 M/s.

Given the data, the rate law for this reaction is OR = KX²M. This is because when the concentration of X is doubled, the rate of the reaction is quadrupled, which is consistent with a rate law of the form OR = k[X]^2.

The pH of an aqueous solution is 8.2, or pH You must be aware of the hydronium ion concentration in moles per liter (molarity).

a way to measure how basic or acidic a substance or solution is. The pH scale has numbers 0 through 14. On this scale, a pH value of 7 is regarded as neutral, indicating it is neither acidic nor basic. If the pH is less than 7, it is more acidic, and if the pH is greater than 7, it is more basic.

The pH of a solution is a key marker of its chemical make-up. The pH may have an impact on nutritional availability, biological function, bacterial behavior, and chemical behavior.

[F-]=0.180M

kb=(1*10^-14 )/(6.6*10^-4)=1.515*10^-11

kb=[OH-][HF]/[F]

kb=1.515*10^-11=x^2/(0.180-x)

kb is very small, so x<<<0.180

1.515*10^-11=x^2/(0.180-x)

Solving for x,

1.515*10^-11=x^2/(0.180)

x=1.651*10^-6 M=[OH-]

[H+][OH-]=1*10^-14 (ionic product of water)

So, [H+]=(1*10^-14 )/(1.651*10^-6 )=6.056*10^-9M

pH=-log[H+]=-log (6.056*10^-9M)=8.2

pH=8.2

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Answer:

sure what is the question

Answer:

In a solid, the atoms and molecules are closely bonded that they vibrate in place but don't move around. liquids: Definite volume but able to change shape by flowing. In a liquid, the atoms and molecules are loosely bonded. They move around but stay close together.

How about liquid Neon or Argon versus gas Neon or Argon? The gas takes up quite a bit more space than the liquid and has molecules bouncing all over the container. The liquid molecules stay towards the bottom but one or two do make it all the way to the top.

The arrangement of particles in a gas is why gases will expand to fill whatever space they occupy. Compared to solids and liquids, gases have the most kinetic energy and the weakest intermolecular interactions. If you continue adding heat, the particles will ionize.

Liquids have a bit more space in-between each molecule than solids. Liquid molecules also move a bit faster than solids, and they will simply flow past other molecules within the container.

hope that helps sorry about the mistake

Explanation:

Butanoic acid and ethanol are the compounds formed when it undergoes hydrolysis in acid

Butyric acid, also recognised as butanoic acid in the science establishment, is a plain alkyl acid with the chemical symbol CH3CH2CH2CO2H. It's an oily, colourless liquid with a foul smell. An isomer is known for producing acid. In the presence of concentrated H2SO4 acid, ethanol reacts with butanoic acid to produce ethyl butanoate as ester and water as products. When an acid interacts with the a base, the product lines are a water and a salt. However, ester is not a salt. As a result, the ethanol + butanoic acid reaction is not an acid-base reaction.

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The complete question is :

When this compound undergoes hydrolysis in acid, what product(s) are obtained? O butanoic acid and ethanol O butanoic acid and butanol O ethanol O butanoic acid

The fuel value of ethane, c2h6, in kilojoules per gram of ethane is calculated as  51.8789 KJ / gm.

The amount of energy generated by complete combustion of a particular mass of the fuel is known as fuel values.

As we know the fuel value of ethane = 1560 KJ / mole

Molar mass of ethane is 30.07 g mole-1

Fuel value kilojoules per gram of ethane is as;

Now, 30.07 gm of ethane have fuel value = 1560 KJ, then 1 gm have fuel value = 1560 KJ / mol  / 30.07 g / mole  = 51.8789 KJ/ g  

Thus, the fuel value of ethane in kilojoules per gram is   51.8789 KJ / gm

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The percent of the SCN- present initially that have been converted to FeSCN2+ = (z/y)*100.

The percent of the SCN- present initially that have been converted to FeSCN2+ at equilibrium can be determined using the equilibrium constant (Kc) for the reaction.

Fe3+ + SCN- <=> FeSCN2+

The equilibrium constant (Kc) for the reaction is defined as:

Kc = [FeSCN2+]/[Fe3+][SCN-]

The value of Kc can be determined from the initial concentrations of reactants and products and the equilibrium concentrations of reactants and products.

Let's say that the initial concentration of Fe3+ is x, the initial concentration of SCN- is y and the equilibrium concentration of FeSCN2+ is z.

For the reaction to be at equilibrium, the rate of the forward reaction must be equal to the rate of the reverse reaction. So the [Fe3+][SCN-] = [FeSCN2+].

At equilibrium, the percent of the SCN- present initially that have been converted to FeSCN2+ is equal to the ratio of the equilibrium concentration of FeSCN2+ to the initial concentration of SCN- multiplied by 100.

The percent of the SCN- present initially that have been converted to FeSCN2+ = (z/y)*100

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In the question, we require a liquid that can be heated & cooled quickly. Therefore, for this purpose, we need a liquid whose value of specific heat capacity is low, it will absorb less amount of heat to get the required change. Hence, option (B)- Low specific heat, is correct.

A heat engine is a system which converts heat into work by taking heat from the reservoir to carry out some work. There is a discharge of some heat to the sink. In this system, there will also be some waste in the form of heat. There are different types of heat engines and a Carnot engine has the maximum efficiency.

The specific heat capacity of any substance is defined as the amount of heat required by one gram of a substance to raise the temperature of that substance by 1 degree Celsius. In the question, we require a liquid that can be heated & cooled quickly, so for this purpose, we need a liquid whose value of specific heat capacity is low, As it will absorb less amount of heat to get the required change.

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Lewis structure of OCS (Carbon Disulfide):
The Lewis structure of OCS follows the octet rule and is drawn as follows:

                                                                                                                     
Atom           Formal Charges
C                    0
O                    +1
S                   -1

In the Lewis structure of OCS, the central atom (carbon) is surrounded by two oxygen atoms and two sulfur atoms, forming a tetrahedral shape. A single double bond is formed between the central atom and the two oxygen atoms, and a single single bond is formed between the central atom and the two sulfur atoms. All the atoms now have a total of 8 electrons each, which is the octet rule. The formal charges of all the atoms in the Lewis structure of OCS are shown above.

The molecule of OCS is drawn by placing the atoms on a grid and connecting them with bonds. The lone pairs of electrons are also shown in the diagram. The formal charges of all the atoms in the correct structure are also given in the diagram.

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When aniline reacts with 3-pentanone, it forms corresponding imine (C=N) .

Because of its electrophilic behaviour, the carbonyl group is more responsive to nucleophilic additions. Because of the carbonyl groups on ketones and aldehydes, these compounds are easily subjected to various sorts of reactions.

Two portions, a and b, are provided to us. In one of the sections, we are Ketone and aniline react, and an aldehyde and hydrogen cyanide react in the b portion. We requested that you provide the key products. An imine (C=N) is produced when aniline and 3-pentanone react.

There are two steps in this reaction. An aniline nucleophilic attack on the carbonyl group of 3-pentanone's carbon occurs in the first step. A loss of water follows this.

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Answer: 22.4 L at STP to figure out the volume of the oxygen in this question at STP. The answer is 0.338 L (338 mL)

Explanation:but you will have to show the calculations to receive credit on your lab report. What is the density of air at STP? 1.225 kg/m^3 In Metric units: 1.225 kg/m^3.

when the sum of financing sources for education expenses is different than the sum of expenses for education expenses.

Education is a deliberate process with certain goals in mind, such as the transmission of knowledge or the development of abilities and moral qualities. The growth of comprehension, reason, kindness, and honesty are a few examples of these objectives. In order to discern between education and indoctrination, various researchers emphasize the importance of critical thinking. Some theorists demand that education leads to the improvement of the learner, while others favor a definition of the term that is value-neutral. Education can also refer to the mental states and dispositions that educated people possess, rather than the process itself, in a somewhat different sense. Transmission of cultural heritage from one generation to the next was the original purpose of education. Today's educational objectives increasingly take new concepts, including the liberation of learners, into account.

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Enantiomers are a form of stereoisomer in which each molecule in the pair of isomers has a carbon atom bonded to four different groups and the isomers are mirror images.

Enantiomers are a type of stereoisomer in which each molecule in a pair of isomers has a carbon atom that is linked to four distinct groups and the isomers are mirror copies of one another. The two optically active forms of tartaric acid, denoted as d-tartaric acid and l-tartaric acid, are an example of an enantiomer pair. Enantiomers are molecules that exist in two mirror copies of one another but cannot be overlaid on top of one another. Enantiomers are chemically similar in every other way.

Here,

Enantiomers are a type of stereoisomer in which each molecule in a pair of isomers has a carbon atom that is linked to four distinct groups and the isomers are mirror copies of one another.

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The lone pair on the indicated N atom resides in a type of sp2 hybridized orbital.

In sp2 hybridization, three orbitals of an atom (typically s, px, and py) are mixed together to form three hybridized orbitals that are oriented in a trigonal planar arrangement. The fourth unhybridized orbital (pz) remains unchanged and can hold a lone pair of electrons.In sp3 hybridization, four orbitals of an atom (typically s, px, py, and pz) are mixed together to form four hybridized orbitals that are oriented in a tetrahedral arrangement. In sp hybridization, two orbitals of an atom (typically s, and p) are mixed together to form two hybridized orbitals that are oriented in a linear arrangement.

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The complete question is:

In what type of orbital does the lone pair on the indicated N atom reside? O p

O sp O sp2

O sp3

Protozoa have eukaryotic cells which have cell wall, nucleus and cell membrane.

Eukaryotic cells are the cells which show presence of nucleus and possess membrane bound organelles.They may be unicellular or multicellular depending on the number of cells present in them.

In eukaryotes , the genetic material is is stored within an organelle which is called as nucleus wherein it is organized in to long molecules which are called as chromosomes.They possess other organelles like mitochondria which are responsible for generation of energy . Endoplasmic reticulum which helps in transport of proteins .

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Relative to the mass of the nucleus of an atom, the mass of the electron is 1/1840 the mass of a hydrogen atom.

All elements' atoms contain electrons, which are negatively charged particles. An electron has 1/1840 u of relative mass. One electron has a charge of -1.

Since an electron's mass is so small compared to that of a proton or neutron (about 1/2000 of each), it is almost impossible for electrons to make up any significant portion of an atom's total mass.

One is a proton's relative mass. One is a neutron's relative mass. An electron weighs 1/1840 of its relative mass (accept 0).

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Answer: A) Volume of a gas B) Number of molecules C) temperature &pressure

Explanation: The law also states that the Kelvin temperature and the volume will be in direct proportion when the pressure exerted on a sample of a dry gas is held constant.

The Grignard reaction is crucial to the creation of a carbon-carbon bond and is one of the reactions that results in this bond.

Grignard compounds, also known as Grignard reagents, are chemical compounds with the general equation RMgX, where X is a halogen and R is a natural group, usually an alkyl or aryl. Examples of typical compounds are methylmagnesium chloride (CH 3), phenylmagnesium bromide (C 6H 5)-MgBr, and others.

Grignard reagents react rapidly with acidic hydrogen atoms found in compounds such as alcohols and water. A Grignard reagent reacts with water to form an alkane when a proton replaces the halogen in the reaction. Thus, a two-step process for converting a haloalkane into an alkane is provided by the Grignard reagent.

In the procedure, Grignard reagents, also known as alkyl or aryl magnesium bromides, are employed.

2-Methyl-2-Butanol is created in reaction to the event.

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The buffer can neutralize 0.0875 g of HCl before the pH falls below 9.00.

A chemical reaction in which an acid and a base react quantitatively with each other is known as neutralization. In a water reaction, neutralization means that there is no excess of hydrogen or hydroxide ions in the solution. Neutralisation is a chemical process in which an acid and a base react quantitatively with each other. It is also spelled Neutralisation. The pH of the neutralised solution is determined by the acid strength of the reactant. Neutralization is the reaction that occurs when acids and bases of equal strength react to generate salt and water. Because acid and bases cancel each other out, the salt generated in the reaction is neutral. I NaOH(aq) + HCl(aq) + NaCl(aq) + H2O (l)

Here,

The buffer can neutralize 0.0875 g of HCl before the pH drops below 9.00.

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The number of moles of heptane that is required to prepare 1M solution in 250ml is 0.250 moles.

The number of moles of a solution can be calculated by multiplying the molarity of the solution by the volume as follows;

Molarity = no of moles ÷ volume

According to this question, a solution of heptane is to be prepared by 1M solution in 250ml. The number of moles involved is as follows:

no of moles = 0.250 × 1

no of moles = 0.250moles

Therefore, 0.250 moles is the number of moles required to produce the heptane solution.

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Two soluble ionic chemicals interact in a twofold replacement reaction to produce an insoluble solid that separates from the aqueous solution.

 [tex]2 \mathrm{OH}_{\mathrm{aq}}^{-}+\mathrm{Cu}_{\mathrm{aq}}^{2+} \rightarrow \mathrm{Cu}(\mathrm{OH})_2 \downarrow[/tex]

Some medications have an effect even though they don't change cellular processes or bind to receptors. For instance, most antacids work by interacting chemically with acids to form neutral salts, which reduce gastrointestinal acidity.

Two soluble ionic chemicals interact in a twofold replacement reaction to produce an insoluble solid that separates from the aqueous solution.

In your situation, copper (II) nitrate, Cu(NO3)2, and sodium hydroxide, NaOH, will totally dissociate in aqueous solution to create cation and anions.

[tex]\mathrm{NaOH}_{\mathrm{aq}} \rightarrow \mathrm{Na}_{\mathrm{aq}}^{+}+\mathrm{OH}_{\mathrm{aq}}^{-}[/tex]

[tex]\mathrm{Cu}\left(\mathrm{NO}_3\right)_2(\mathrm{aq}) \rightarrow \mathrm{Cu}_{\mathrm{aq}}^{2+}[/tex]

Cu(OH)2s, an insoluble ionic compound that precipitates out of solution, and aqueous nitrate, NaNO3, another soluble ionic molecule, are the products of the process.

This is the balanced chemical equation for this reaction.

[tex]2 \mathrm{NaOH}_{\mathrm{aq}}+\mathrm{Cu}\left(\mathrm{NO}_3\right)_{2(\mathrm{aq})} \rightarrow \mathrm{Cu}(\mathrm{OH})_{2(\mathrm{~s})} \downarrow 2 \mathrm{NaNO}_{3(\mathrm{aq})}[/tex]

Now note that the reaction requires 2 moles of sodium hydroxide for every 1 mole of copper (II) nitrate.

Rewrite the soluble ionic compounds as cations and anions to obtain the entire ionic equation.

[tex]& 2 \times \overbrace{\left(\mathrm{Na}_{\mathrm{aq}}^{+}+\mathrm{OH}_{\mathrm{aq}}^{-}\right)}^{\mathrm{NaOH}}+\overbrace{\mathrm{Cu}\left(\mathrm{NO}_3\right)_2}^{\left(\mathrm{Cu}_{\mathrm{aq}}^{+}+2 \mathrm{NO}_{\mathrm{aq}}^{-}\right)} \rightarrow \mathrm{Cu}(\mathrm{OH})_{2(\mathrm{~s})} \downarrow \\[/tex]

[tex]& +2 \times \underbrace{\left(\mathrm{Na}_{\mathrm{aq}}^{+}+\mathrm{NO}_{3 \mathrm{aq}}^{-}\right)}_{\mathrm{NaNO}_3}[/tex]

This is equivalent to

[tex]2 \mathrm{Na}_{\mathrm{aq}}^{+}+2 \mathrm{OH}_{\mathrm{aq}}^{-}+\mathrm{Cu}_{\mathrm{aq}}^{2+}+2 \mathrm{NO}_3^{-} \rightarrow \mathrm{Cu}(\mathrm{OH})_2 \downarrow+2 \mathrm{Na}_{\mathrm{aq}}^{+}[/tex]

Eliminating Spector ions is now necessary to obtain the net ionic equation; in this instance, you would have

[tex]2 \mathrm{Na}_{\mathrm{aq}}^{+}+2 \mathrm{OH}_{\mathrm{aq}}^{-}+\mathrm{Cu}_{\mathrm{aq}}^{2+}+2 \mathrm{NO}_3^{-} \rightarrow \mathrm{Cu}(\mathrm{OH})_2 \downarrow+2 \mathrm{Na}_{\mathrm{aq}}^{+}[/tex]

Which is equivalent

[tex]2 \mathrm{OH}_{\mathrm{aq}}^{-}+\mathrm{Cu}_{\mathrm{aq}}^{2+} \rightarrow \mathrm{Cu}(\mathrm{OH})_2 \downarrow[/tex]

A blue, insoluble substance called copper(II) hydroxide separates from the solution.

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Answer:Temperature

Explanation:

C. X and Y are the set of points lies within plane I

A plane is a two-dimensional, flat surface that extends indefinitely. A plane is a two-dimensional analogue that can incorporate three dimensions of space, a line, and a point.

In the planar equation, enter the coordinates of the provided points and record the values in P1 and P2. Verify the obtained values' signs: They are on the same side of the plane if P1 and P2 have the same parity. P1 and P2 are located on the opposing sides of the plane if their parities differ.

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Which set of points lies within plane I.

A) T and Y

B) X and V

C) X and Y

D) U and V