You have twenty ml of a 90 mmol/liter solution of glucose. if you add forty ml of water, the concentration of glucose in the new solution will be:_____.

Answer:

4510 J

Explanation:

To calculate the energy of the water, you need to use the following equation:

Q = mcΔT

In this equation,

-----> Q = energy/heat (J)

-----> m = mass (g)

-----> c = specific heat capacity (J/g°C)

-----> ΔT = change in temperature (°C)

First, you need to determine the mass of the water. To do this, you need to multiply the given volume by the density of water (1.00 g/mL).

 100.0 mL H₂O          1.00 g
------------------------  x  ------------  =  100.0 g H₂O
                                    1 mL

Now, you can plug the given values into the equation and solve for "Q" (Q = [tex]q_H_2_O[/tex]). The final answer should have 3 significant figures to match the given values with the lowest number of sig figs.

Q = ? J                           c = 4.18 J/g°C

m = 100.0 g                  ΔT = 32.0 °C - 21.2 °C = 10.8 °C

Q = mcΔT

Q = (100.0 g)(4.18 J/g°C)(10.8 °C)

Q = 4510 J

4510Answer:

Explanation:

Answer:

4 M

Explanation:

Molarity can be represented by the following ratio:

Molarity = moles / volume (L)

Since you have been given both the mass and volume, you can plug the values into the equation and solve for molarity.

Molarity = moles / volumes

Molarity = 2.0 moles / 0.50 L

Molarity = 4 M

Answer:

can u show the answer it give you for the question

The float property allows the positioning of an element to the right or left of other elements.

In the context of web development and CSS, the "float" property is used to control the positioning of elements within a container. It allows you to move an element to the left or right of its containing element, enabling other elements to flow around it.

When an element is floated, it is taken out of the normal flow of the document, allowing other elements to wrap around it. This can be particularly useful for creating layouts where you want elements to appear side by side or to create text flow around images.

The "float" property can take one of two values: "left" or "right". When an element is set to "float: left", it will move to the left of its containing element, and any subsequent elements will wrap around it on the right side. Conversely, when set to "float: right", the element will move to the right, and subsequent elements will wrap around it on the left side.

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An overpack containing four one-liter metal cans of NA1993, Compounds, cleaning liquid, a Class 3 (Flammable liquid), PG III, being offered for transportation by highway, may qualify for specification packaging. This is further explained below.

Generally, The term "specification packaging" refers to a package that meets one of the packaging specifications or standards listed in this subchapter's parts 178 or 179.

In conclusion, It's possible that an overpack that contains four metal cans of one liter each filled with NA1993, Compounds, cleaning liquid, a Class 3 (Flammable liquid), PG III, and that's being provided for transportation on the highway might qualify as specified packing.

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Answer:

0.348 moles Ar

Explanation:

You can determine the moles of argon (Ar) by multiplying the given mass by the atomic mass of argon. This number gives the mass in grams per 1 mole. It is important to arrange the conversion in a way that allows for the cancellation of units. The final answer should have 3 significant figures to match the sig figs of the given value (13.9 = 3 sig figs).

Atomic Mass (Ar): 39.948 g/mol

 13.9 g Ar              1 mole
-----------------  x  ------------------  =  0.348 moles Ar
                            39.948 g

The balanced chemical equation for the standard formation reaction of liquid acetic acid is given as ,

[tex]2C(gr) +2H_{2} (g) +O_{2} (g)[/tex]  → [tex]CH_{3} COOH(l)[/tex]

The reaction that form the products from their elements in their standard state is called formation of reaction .The acetic acid consist C , H , and O , So, determine their standard state . Carbon is graphite at 25°C and 1 atm , whereas hydrogen and oxygen are diatomic gases . Hence , we start with unbalanced reaction.

[tex]C(gr) +H_{2} (g) +O_{2} (g)[/tex] → [tex]CH_{3} COOH(l)[/tex]

The balanced chemical equation for the standard formation reaction of liquid acetic acid as,

[tex]2C(gr) +2H_{2} (g) +O_{2} (g)[/tex]  → [tex]CH_{3} COOH(l)[/tex]

The combustion of liquid acetic acid is given as,

[tex]CH_{3} COOH(l) + 2O(g)[/tex] → [tex]2CO_{2}((g) +2H_{2} O(l)[/tex]                    ΔH =-873

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The observation is the evolution of carbon dioxide gas.

Sodium hydrogen carbonate is a base while lemon juice contains an acid known as citric acid.

Thus, the reaction in the illustration is involving an acid and a base.

Sodium hydrogen carbonate goes by the formula: NaHCO₃

Citric acid goes by the formula: C₆H₈O₇

The reaction between the two goes thus:

[tex]3 NaHCO_3 + C_6H_8O_7 --- > 3 H_2O + 3 CO_2 + Na_3C_6H_5O_7[/tex]

The carbon dioxide gas is evolved from the reaction vessel in the form of bubbles.

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It should be remembered that the mole fraction of any component making up a system is 1.

the proportion of the moles of one component to the total moles of all the components in a solution or other mixture.

The ratio of molecules of one component in a mixture is known as a mole fraction. For instance, if the methane mole fraction in a gas is 0.90, then this implies that 90% of the molecules are methane. The mixture also contains 90% methane since the amount fractions resemble mole fractions.

By dividing the moles of the solute by the total moles of the substances in the solution, you may determine the mole fraction of the solute.

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The boiling point of water would increase by 1°C if 1 mol of NaCl added 1 kg of water.

The addition of solute substances to solvent such as water results in a change in the boiling points and freezing points of the solvents.

The formula to calculate the change in temperature is given below:

ΔT = Kbmi

Where;

m is molality of the solution

Kb and i are constants.

Solving for change in temperature:

m = 1 mol/kg

ΔT = 0.51 * 1 * 2

ΔT = 1°C

The normal boiling point of water is 100°C

The new boiling point of the solution = (100 + 1) = 101 °C

In conclusion, addition of solute to solvent will result in change in the boiling point of the solvent.

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An acute effect is an immediate or rapid harmful reaction to a exposure.

A chronic effect is a permanent/ long-lasting consequence from exposure to a single dose or to repeated lower doses of a harmful substance.

What is an acute effect?

Acute (short-term) effects show up immediately or soon after exposure to the chemical. They may be minor, like nose or throat irritation, or they could be serious, like eye damage or passing out from chemical vapors. It is an adverse effect on a human or animal body, with severe symptoms developing rapidly and coming quickly to a crisis.

What is a acute effect example?

Examples of acute health effects include dizziness, skin irritation, and throat irritation. Keep in mind that a chemical may cause both acute and chronic effects.

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Toluene compound reacts third fastest with fuming sulfuric acid.

The reaction is attached in figure -

What is toluene?

What is a toluene used for?

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The molarity of the solution is 0.528 mol/l.

What is molarity?

The molarity of any solution is the number of moles per liter of the solution.

Given,

The molality of the solution is 0.0480 m Lif

The density of the solution is 1.10 g/ml

Step 1: 0.0480 moles of LiF were present in 1 kg solvent.

Mass of 0.0480 moles of LiF = 0.0480 mol × 26 g/mol = 1.248 g

Mass of the solution (m)=  1 kg (solvent) + 1.248 g(solute)

m = 1000 g + 1.248 g = 1001.248 g

Step 2: Find the volume of the solution

Step 3: Calculating the molarity

Thus, the molarity of the solution is 0.528 mol/l.

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3M

3M is the molarity of a koh solution if 200 ml of the solution contains 0. 6 moles KOH.

Molarity : Molarity is defined as the number of moles of solute present in one liter of solution.

We know that,

Molarity = [tex]\frac{n*1000}{v}[/tex]

where,

n = moles of solute of KOH = 0.6

V= volume of solution in ml= 200 ml

Now on substituting the values in the molarity formula,

molarity = [tex]\frac{0.6*1000}{200}[/tex] = 3M/L

Therefore, molarity = 3M

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6 gram of sodium hydroxide (NaOH) needed to make 500ml if  0.3  NaOH solution.

Molarity (M) is the amount of a substance in a certain volume of solution.

Molarity is defined as the moles of a solute per liters of a solution.

The unit of molarity is mol/L.

Volume of NaOH = 500 mL

Molarity of the aqueous solution = 0.3 M

Molar mass of NaOH= (23+16+1) g = 40g

Let the mass of NaOH be X.

Now , according to formula number of moles of a given substance = given mass / molar mass

Therefore, no. of moles of NaOH =  X/40

Since, molarity = number of moles of solute/ volume of solution in liter.

Hence,  0.3 = ( X /40) / (500 / 1000)

Solving this we get X= 6g

6 gram of sodium hydroxide (NaOH) needed to make 500ml if  0.3  NaOH solution.

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The mass (g) of a piece of magnesium wire that produces 41. 8 ml of hydrogen gas collected over water at 21. 0 °c and at a pressure of 752 torr is  0.041 gm.

Calculation,

According to ideal gas equation,

PV = nRT

Where, P is the pressure = 752 torr = 752 mmHg/760 mmHg/atm

P is the pressure in atm = 0.989atm

V is the volume = 41. 8 ml = 0.0418 L

R is the universal gas constant = 0.0821 Latm/mol K

T is the temperature =  21. 0 °C = 21. 0 + 273 = 294 K

n is the number of moles = ?

By putting value of P , V , T , and  R in equation (i) we get,

0.989atm × 0.0418 L = n ×0.0821 Latm/mol K ×294 K

n = 0.989atm × 0.0418 L/0.0821 Latm/mol K×294 K = 0.00171 mol

Number of moles (n) = given mass/ molar mass =  given mass/24.305

Mass = Number of moles×molar mass =  0.00171 mol×24.305 g/mol

Mass of the magnesium wire = 0.041 gm

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Chemical symbols that will complete the equation are 2NaCl + Br2

The balanced Chemical reaction is -

                                    [tex]2NaBr[/tex] + [tex]Cl_{2}[/tex] → [tex]2NaCl[/tex]  + [tex]Br_{2}[/tex]

Chlorine ([tex]Cl_{2}[/tex]) is more reactive than bromine([tex]Br_{2}[/tex]). So, chlorine  displaces  bromine  from its  compound.

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The number of  electrons present in the nonbonding π molecular orbital of the allyl anion is 4 electrons . 2 in the pi bond of the allyl ion and the other two will be present as a lone pair on the carbon atom.

It is a type of orbital that does not affect the bond order or bond length and the bond order of the molecule and does not affect its energy too.

In allyl anion  allyl anion occupies 4 pi electrons and ψ2 is the Highest Occupied Molecular Orbital whereas ψ3* is the Lowest Unoccupied Molecular Orbital

Therefore, the number of  electrons present in the nonbonding π molecular orbital of the allyl anion is 4 electrons . 2 in the pi bond of the allyl ion and the other two will be present as a lone pair in on the carbon atom.

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Answer:

Explanation:

The energy of a particle in the box increases proportionally to n-squared. This means that the energy spacings increase at high values of n.

The energy levels of a quantum particle-in-a-box decreases as the quantum number increases.

Quantum numbers can be used to describe the trajectory and the movement of an electron in an atom.

The set of numbers used to describe the position and energy of an electron in an atom is called quantum numbers.

These are the four quantum numbers, i.e., principal quantum number (n), magnetic quantum number (m), azimuthal quantum number (l), and spin quantum number (s).

As the energy levels of a quantum particle-in-a-box decreases as the quantum number increases.

Therefore, The energy levels of a quantum particle-in-a-box decreases as the quantum number increases.

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The balanced overall reaction from these unbalanced half-reactions is given  in following steps ,

Step 1 : [tex]Sn[/tex] → [tex]Sn^{+2}+ 2e^{-}[/tex]  

Step 2 : [tex]Ag^{+}[/tex] + [tex]e^{-}[/tex] →  [tex]Ag[/tex]

 [tex]2Ag^{+} + 2e^{-}[/tex] → [tex]2Ag[/tex]

Overall reaction : [tex]Sn[/tex] + [tex]2Ag^{+}[/tex] → [tex]Sn^{+2}[/tex] + [tex]2Ag[/tex]

The equation in which number of atoms of elements in reactant side is equal to the number of atoms of elements in product side is called balanced chemical equation .

This step is oxidation half-reaction in which loss of electron is takes place .

Second steps is reduction reaction in which fain of electrons is takes place. We multiple second  half-reaction by two to make equal number of electrons in both steps to cancel out the electrons from the equation.

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The stock solution should have a molarity of 8.24M.

Proportional sets. C₁V₁=C₂V₂ is used to calculate an unknown quantity where two solutions/mixtures are proportional.

It follows that the initial concentration times the initial volume will equal the final concentration times the final volume because the sum does not vary.

Using the formula as follows;

                       C₁V₁ = C₂V₂

Where;

C₁ = initial concentration of the stock solution

C₂ = final concentration of the stock solution

V₁ = initial volume of the stock solution

V₂ = final volume of the stock solution

According to the information given in this question,

V₁ = 25mL = 25/1000 = 0.025L

V₂ = 2L

C₁ =?

C₂ = 0.103M

Using the formula; C₁V₁ = C₂V₂

C₁ = C₂V₂/V₁

C₁ = (0.103 × 2) / 0.025

C₁ = 0.206 / 0.025

C₁ = 8.24 M

Therefore, the stock solution should have a molarity of 8.24M.

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As a gaseous element condenses, the atoms become closer together and they have more attraction for one another.

The transformation of water vapour into liquid is known as condensation. The process is the opposite of evaporation, in which liquid water turns into a vapour. Either the air is chilled to its dew point or it gets too saturated with water vapour to retain any more water, causing condensation to occur.

Attraction - Gas Particles move continuously in a straight path in a gas. They are significantly further apart and move independently of one another because the kinetic energy of the molecule is larger than the attraction force between them. There are often almost no attractive forces between particles.

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We do not perform the titration while the sample is at its original temperature because reaction is too slow at original temperature and requires high activation energy.

A titration is a method where the concentration of an unknown solution is ascertained by comparing it to a solution of known concentration. The analyte (the unknown solution) is typically added in a known amount to the titrant (the known solution) from a buret until the reaction is finished.

The slow energy step in the reaction process may require a high activation energy, and the proportion of activated molecules needed to reach this reaction at room temperature or original temperature is too low, so most molecules cannot cross this peak. As a result, the reaction at room temperature proceeds very slowly (the final product is not reached). Heat can enhance the proportion of active molecules and catalyse a larger-scale reaction.

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The mechanism for the interconversion of α-d-glucose and β-d-glucose in dilute HCl include the proton transfer in first step and nucleophilic attack in second step.

In the first step oxygen donates its lone pair of electron to hydrogen of HCl. There is removal of water molecule from the substance α-d-glucose.

The organic reaction where one nucleophile replaces another is called nucleophilic substitution reaction. These reaction takes place in aromatic compounds, acyl compounds and aliphatic compounds. SN¹ reactions are nucleophilic substitution reaction.

Thus from the above conclusion we can say that The mechanism for the interconversion of α-d-glucose and β-d-glucose in dilute HCl include the proton transfer in first step and nucleophilic attack in second step.

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When atoms of beryllium-9 are bombarded with alpha particles, neutrons are produced, the new isotope will be C-6.

In research, the physicist James Chadwick attacked Beryllium using alpha particles produced by the nuclear reactions of polonium naturally. High radiation penetration through some kind of lead shield was seen, which the then-current particle theories were unable to account for.

There was indeed the production of a carbon-12 nucleus as well as the production of a neutron whenever one blasted beryllium with alpha particles.

The reaction of alpha decay can be written as:

[tex]Be^{9} _{4} + He^{4} _{2}[/tex] → [tex]C^{12} _{6} + n^{1} _{0}[/tex]

Therefore, when atoms of beryllium-9 are bombarded with alpha particles, neutrons are produced, the new isotope will be C-6.

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Answer:

D.) magnesium and sulphur​

Explanation:

Generally, ionic bonds form between a metal and a nonmetal.

Generally, covalent bonds form between two nonmetals.

Generally, metallic bonds form between two metals.

Nonmetals are located on the right side of the periodic table (apart from the noble gases in the final column). Hydrogen is also a nonmetal. Metals are every other element in the periodic table.

A.) Hydrogen (nonmetal) and carbon (nonmetal) = covalent

B.) Aluminum (metal) and magnesium (metal) = metallic

C.) Silicon (nonmetal) and chlorine (nonmetal) = covalent

D.) Magnesium (metal) and sulphur (nonmetal) = ionic

Answer is although the question should have 3 significant figures.

Fe + CuSO4 --> Cu + FeSO4

It is already balanced

1 mol Fe : 1 mol CuSO4 : 1 mol Cu : 1 mol FeSO4

Fe: 55.8 g/mol

Cu: 63.5 g/mol

number of moles = mass in grams / atomic mass = 93.7 g / 55.8 g/mol = 1.679 mol

1 mol Fe / 1 mol Cu => 1.679 mol Fe / 1.679 mole Cu

mass = atomic mass * number of atoms = 63.5 g/mol * 1.679 moles = 106.6 g = 107 rounded to 3 significant figures.

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Answer:

four

Explanation:

i said so

Covalent hydrogen bond is joining the two hydrogen atoms.

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The temperature of the chemistry book decreasing as the chemistry book slides across it is the difference when motion is slower.

What is Temperature?

Temperature is a unit used to convey hotness or coolness. It can be stated in terms of any number of arbitrary scales and indicates the direction in which heat energy will naturally flow, i.e., from a hotter body to a cooler body (one at a lower temperature). Temperature is not the same as the energy of a thermodynamic system; for instance, an iceberg has a significantly larger total heat energy than a match, despite the fact that a match is burning at a much higher temperature.

What is relation between motion and temperature ?

When motion is slow , there is an decrease in friction and decrease in thermal(heat) energy which leads to decrease in temperature.

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Answer:

The speed of the particles of the chemistry book increases when the chemistry book slides across the physics book.

Explanation:

edmentum

(A)  Color changes from reactant to products.

The rate of a chemical reaction is calculated by dividing the rate of change in a reactant or product's concentration by the coefficient from the equation's balanced state.

2N2O5(g)    →  4NO2(G) + O2(g)

A change in color and the appearance of bubbles are two indications of a chemical shift.In a chemical process, the makeup of the components changes; in a physical change, the appearance, smell, or straightforward exhibition of a sample of matter changes without changing its composition.

Despite the fact that we refer to them as physical "reactions," nothing is actually changing. A change in the substance in question's elemental composition is necessary for a reaction to occur. Therefore, from now on, we will simply refer to bodily "reactions" as physical changes.

Physical modifications must only cause a variation in display without altering the composition. Typical modifications include, but are not limited to:

Texture\Color\Temperature\Shape

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