• The purpose of the lab, what you explored, what you learned • A description of how changes in concentration of reactants and products affect forward and reverse reaction rates based on your observations • A statement that describes whether your data supports or fails to support each hypothesis based on your observations

Answer:

318.749g

Explanation:

The find the mass,

We use this formula

Number of mole = mass/ molar mass

Since number of mole = 3.25mol

Let the number of mass be x

The molar mass of H2SO4

H - 1.00784 * 2= 2.01568

S - 32.065

O - 15.999 * 4 = 63.996

Note there are 2 moles of H and 4 moles of O and 1 mole of S

Molar mass of H2SO4 = 2.01568 + 32.065 + 63.996

= 98.07668g/mol

Number of mole= 3.25mol

3.25 = x / 98.07668

x = 3.25 * 98.07668

x= 318.749g

Hence, the number of mass is 318.749g

Hope it will help you.

The united stated chemical industry produces more sulfuric acid, in terms of mass, than any other chemical. The mass of 3.25 moles of sulfuric acid is 318.749g.

The term molar mass is defined as the ratio between the mass and the amount of substance of any sample of said compound. A mole of any substance is 6.022 × 10²³ molecules.

The find the mass,

We use this formula given as follows:

Number of mole = mass / molar mass

So number of mole = 3.25mol

Let the number of mass be x

The molar mass of H2SO4

H - 1.00784  × 2 = 2.01568

S - 32.065

O - 15.999 × 4 = 63.996

Molar mass of H2SO4

= 2.01568 + 32.065 + 63.996

= 98.07668g/mol

Number of mole = 3.25mol

3.25 = x / 98.07668

x = 3.25 × 98.07668

x = 318.749g

Thus, The united stated chemical industry produces more sulfuric acid, in terms of mass, than any other chemical. The mass of 3.25 moles of sulfuric acid is 318.749g.

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A voltage is generated between the two cell halves in the \(Zn/Zn^{2+}\)concentration cell. The electrode with the increased concentration of \(Zn^{2+}(1.0 M)\) will be oxidized, while \(Zn^{2+}\) the electrode with the lower concentration of \(Zn^{2+}(10^{-2} M)\) will be reduced.

In a concentration cell, the difference in ion concentration between two electrodes produces a potential difference or voltage. In this case, both electrodes are pure zinc (Zn), and the \(Zn^{2+}\) concentration differs between the two cell halves.

The cell reaction can be depicted as follows:

Zn(s) → \(Zn^{2+}\)(1.0 M) + 2e-  (oxidation at the electrode with 1.0 M \(Zn^{2+}\))

Zn(s) + 2e- → \(Zn^{2+}(10^{-2} M)\) (reduction at the electrode with 10-2 M Zn2+)

The Nernst equation can be utilized to calculate the Ecell.

Ecell = E°cell - \((\frac{RT}{nF}) ln(Q)\)

where:

E°cell=standard cell potential = 0 V

R = gas constant (8.314 J/mol·K)

T = 25°C = 298 K

n = number of electrons transferred = 2

F = Faraday constant = 96,485 C/mol

Q = reaction quotient = ratio of concentrations of \(Zn^{2+}=(\frac{1.0 M}{10^{-2} M})\)

We know that the E°cell is 0 V and the logarithm of Q will be greater than 0 as \((\frac{1.0 M}{10^{-2} M})\) is greater than 1. So, the product of (RT/nF) and ln(Q) will also be positive. Therefore, a voltage is generated between the two cell halves.

So, the electrode with the increased concentration of \(Zn^{2+}(1.0 M)\) will be oxidized, while \(Zn^{2+}\) the electrode with the lower concentration of \(Zn^{2+}(10^{-2} M)\) will be reduced.

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Answer:

37

Explanation:

( 98.6 - 32 ) × 5(100c) ÷ 9(180f) = 37

Answer: a) Gases are not at all rigid.

Explanation: Gases are composed of particles that are in constant random motion, and they do not have fixed positions. Gases do not have a definite shape or volume. They exhibit high compressibility. When we apply pressure to a gas, the molecules close in on each other, reducing the volume of the gas.

Gases can expand due to the free movement of gas molecules, which allows them to take on any shape based on the container, thus filling the container's volume. Thus, gases can expand to fill the containers.

Gases have no fixed volume or shape in the gaseous state. The gaseous pressure is caused by collision of molecules on the container walls. Therefore, gases don't have particles in fixed positions.

Gases have lower density as compared to solid and liquid. Gas particles move randomly against each other, with no fixed position due to their low density. The molecules  are separated by large distance. their collision has no effect on their movement. Thus, Gas have low density.

Therefore from all above options, a is the correct answer.

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Answer:

3 and 4

Explanation:

After Rutherford did the alpha particle scattering experiment, he realised that most of the atom must be empty space, and the positive charge needed to be concentrated in the middle of the atom (in the nucleus).

This was because most of the alpha particles went straight through the gold sheet but some were deflected to the side or straight back.

This led to the nuclear model, where Rutherford concluded that most of the mass and all of the positive charge was concentrated in the middle of the atom in the nucleus, and the electrons existed in a sort of negatively charged cloud around the nucleus.

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There is the formation of intermolecular hydrogen bonding in ethanol as shown in the model below.

Intermolecular interactions can arise when ethanol, a common alcohol, is liquid. These interactions result from the ethanol molecule's polarity and hydrogen bonding propensity.

Two carbon atoms, five hydrogen atoms, and one oxygen atom make up the compound ethanol (C2H5OH). Because the oxygen atom is more electronegative than the carbon and hydrogen atoms, they are bound together by a polar covalent bond.

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The dynamic behavior of a temperature sensor/transmitter can be modeled as a first-order transfer function (in deviation variables) that relates the measured value to the actual temperature. The time constant of this transfer function describes the response of the sensor/transmitter to a step change in temperature.

A temperature sensor is an instrument that senses temperature and converts it to an electrical signal. This electrical signal can then control a system or monitor a process. The dynamic behavior of a temperature sensor/transmitter is an important characteristic that must be understood in order to accurately control or monitor a process. The dynamic behavior of a temperature sensor/transmitter can be modeled as a first-order transfer function (in deviation variables) that relates the measured value to the actual temperature. The transfer function can be represented by the following equation:()=1+1Where: T(s) = transfer function = system gainT1 = time constantThe time constant T1 of the transfer function describes the response of the sensor/transmitter to a step change in temperature. A considerable time constant indicates a slow response, while a small-time consistent indicates a fast response. The time constant is a function of the physical properties of the sensor/transmitter and can be measured experimentally. In summary, the dynamic behavior of a temperature sensor/transmitter can be modeled using a first-order transfer function, with the time constant of the transfer function describing the response of the sensor/transmitter to a step change in temperature.

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Answer:

Explanation:

47 i took the test

Silver (Ag) has 47 protons, 60 neutrons, and 47 electrons in each atom. Based on this information, the mass number of the silver would be 107.

The total number of protons present in an atom is known as the atomic number of that atom. The atomic number has no correlation either with the number of neutrons or the number of electrons present inside an atom.

As given in the problem Silver (Ag) has 47 protons, 60 neutrons, and 47 electrons in each atom.

The atomic number of the silver =  number of protons

                                                     = 47

The mass number of the silver = number of protons + number of neutrons

                                                   =47 + 60

                                                   =107

Thus, based on the given information the mass number of the silver would be 107.

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If half life of an isotope is 12 days, then there are about 820.42 transformations in the stomach after the person ate 400 Bq of the isotope.

Using the GI track model information, the number of transformations in Stomach can be calculated as follows :

We know that the half-life of an isotope is defined as the time taken for half of the radioactive atoms to decay.

The decay of the isotope can be represented by the following formula : N(t) = N0e^(-λt)

where:

N(t) = Number of atoms at time t

N0 = Initial number of atoms

λ = Decay constant

t = Time elapsed from the initial time t = 0

For a given isotope, the decay constant is related to the half-life as follows : λ = 0.693/T1/2

where : T1/2 = Half-life time of the isotope

Given that the half-life of the isotope is 12 days, we can calculate the decay constant as follows :

λ = 0.693/12 = 0.0577 day^(-1)

The number of transformations in the stomach can be calculated by using the following formula :

Activity = A0e^(-λt)

where : A0 = Initial activity of the isotope in Bq

λ = Decay constant

t = Time elapsed from the initial time t = 0

Activity = 400 Bq (Given)

Decay constant (λ) = 0.0577 day^(-1)

Time elapsed (t) = Time taken by the isotope to reach the stomach from the time of consumption = 0.17 days (Given by GI track model)

Therefore, the number of transformations in the stomach is :

Activity = A0e^(-λt)A0 = Activity/e^(-λt)A0 = 400 Bq/e^(-0.0577 × 0.17)A0 = 400 Bq/e^(-0.009809)A0 = 447.45 Bq

The number of transformations in the stomach can be calculated as follows :

Number of transformations = Activity decayed per unit time/Disintegration constant

Activity decayed per unit time = A0 - Activity after time elapsed

Activity decayed per unit time = 447.45 - 400 = 47.45 Bq

Disintegration constant = Decay constant = 0.0577 day^(-1)

Therefore, number of transformations = (447.45 - 400) Bq/0.0577 day^(-1)

Number of transformations = 820.42

This means that there are about 820.42 transformations in the stomach after the person ate 400 Bq of the isotope.

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The correct option is C) (Endothermic, Exothermic, Endothermic).

The endothermic reaction is the one that requires energy (heat) to run the reaction or form the products. Here, the heat is absorbed by the reactant.

The exothermic reaction is the one that releases energy (heat) during the formation of products. Here, the heat is released as the by-product.

The enthalpy of solution (∆Hsoln) is defined as;

∆Hsoln = ∆Hsolute + ∆Hsolvent + ∆Hmix

Considering whether each term is endothermic or exothermic, the correct option is C) (Endothermic, Exothermic, Endothermic).

Here,

∆Hsolute - Endothermic (breaking solute-solute bonds)

∆Hsolvent - Exothermic (breaking solvent-solvent bonds)

∆Hmix - Endothermic (forming solute-solvent bonds)

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Answer: It’s the second one.

Explanation:

Digestion is breaking down food to pass down and fire is chemically changing the partials.

Answer: A squirrel eating acorns and a fire burning

Hope this helps!

Answer:

Is 40.10 ml

Explanation:

i've dome it before

According to molar concentration, 1.6 grams of solid NaOH is required to achieve this solution.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.

In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.

On substitution of values,mass= 0.10×40×0.4=1.6 g.

Thus,1.6 grams of solid NaOH is required to achieve this solution.

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Answer:

A) The pH will increase.
B)The pH will change because the solution is being neutralized via a basic solution being added to an acid.

Moles are the quantity of a substance that is found in the atom or the molecules. 0.85 moles of zinc iodide will be produced from the reaction between hydroiodic acid and zinc bromide.

What is the mole in chemistry?

The mole is the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12; its symbol is “mol”.

The balanced reaction is  -

2HI + ZnBr2 → 2HBr + ZnI2.

Moles of hydroiodic acid = 1.7 moles

Moles of zinc bromide = 3.43 moles

From the reaction, it can be said that 2 moles of hydroiodic acid need 1 mole of zinc bromide.

So, the moles of zinc bromide that will react in the reaction are:

1.7/2 = 0.85 moles

Hence, hydroiodic acid is a limiting reactant, and zinc bromide will remain in the reaction as it is an excess reagent.

Moles of zinc iodide is calculated from the limiting reagent:

1.7/2 = 0.85 moles

Therefore, 0.85 moles of zinc iodide are formed.

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Answer:

forms of mercury

Explanation:

Answer:

Explanation:

Mercury is an element and a metal that is found in air, water, and soil.Mercury rarely occurs uncombined in nature, but can be found as droplets in cinnabar (mercury sulfide) ores. China and Kyrgyzstan are the main producers of mercury. The metal is obtained by heating cinnabar in a current of air and condensing the vapour.

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2Na + 2H2O → 2NaOH + H2

The balanced equation

Answer:

ore

Explanation:

The example of a reaction to which Markovnikov's rule applies is: CH₂=CH-CH₂-CH₃ + HBr → CH₂Br-CH₂-CH₂-CH₃

In this reaction, the hydrogen atom from HBr adds to the carbon atom with the fewer alkyl substituents (less substituted carbon), while the bromine atom adds to the carbon atom with more alkyl substituents (more substituted carbon). This follows Markovnikov's rule, which states that in the addition of a protic acid (such as HBr) to an asymmetrically substituted alkene, the hydrogen atom adds to the less substituted carbon and the other atom adds to the more substituted carbon.

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Answer:

Leavening agent is a material that causes doughs and batters to expand by releasing gases from inside the mixture, resulting in porous baked goods. Air, steam, yeast, baking powder, and baking soda are examples of such agents.

Explanation:

grouping elements into s, p, d, and f blocks allows us to predict the chemical and physical properties of elements based on their electron configurations and periodic table positions.

The periodic table's s, p, d, and f blocks refer to the arrangement of electrons in the atom's outermost energy level (valence shell), and they are related to the element's type and properties in several ways.

Atomic size increases from right to left within a period and from top to bottom within a group.

Ionization Energy: The energy required to remove an electron from an atom is referred to as ionisation energy.

Electronegativity: The ability of an atom to attract electrons towards itself in a chemical bond is measured by electronegativity.

Reactivity: An element's reactivity is determined by the number of valence electrons it possesses. Because the s-block elements have one or two valence electrons, they are extremely reactive.

Chemistry: Ionic compounds are formed by s-block elements with nonmetals, whereas covalent compounds are formed by p-block elements.

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Answer:

D. Because they lose electrons

Explanation:

In neutral state the numbers of proton (+) = numbers of electrons (-)

if there are less electrons, there will be more protons than electrons => positive charge

if there are more electrons, there will be more electrons than protons => negative charge

Answer:

No.

Leftmost: Rick shouldn't be smelling any vapors; if required he should be using the wafting technique instead of putting it close to his face. Additionally, He's not wearing gloves nor a lab coat.

Middle: Sarah is not wearing any goggles nor a lab coat and she's at risk as she's pouring two different liquids into a solution at the same time which may pose a hazard of sudden irritation, exposure, heat or combustion.

Rightmost: Andrew is drinking a chemical of supposedly unknown origin putting him at risk by ingestion all the while lacking all of the requisite Personal Protective Equipment.

All of them are also at fault for leaving and not containing a chemical spill off to the side (rightmost), and by the looks of it, enter and operate the lab without their supervisor/professor present.

Explanation:

basta may sagot, sis

answer and explanation

we know that :

1 kg = 1000g

we can use this to calculate how many grams are in 3.5kg as follows

1000 g/ 1 kg x 3.5kg/1 = 3500 g/1 = 3500g

Answer:

9.90

Explanation:

Given [H+] = 1.25 x 10^-10 M, we can calculate the pH using the formula:

pH = -log10([H+])

pH = -log10(1.25 x 10^-10)

Using logarithmic properties:

pH = -log10(1.25) - log10(10^-10)

Since log10(10^-10) is equal to -10:

pH = -log10(1.25) - (-10)

pH = -log10(1.25) + 10

Now, evaluating the logarithm using a calculator:

pH = -0.0969 + 10

pH = 9.9031

Therefore, the pH of the solution with [H+] = 1.25 x 10^-10 M is approximately 9.9031. Rounding it to two decimal places, the pH is approximately 9.90.

Answer:

Ahhh! I had the same question

Explanation:

Elodea leaf was the subject of a test by Ms. Sanchez. Using a light source and oxygen gas, she conducted an experiment in which she counted the number of bubbles emitted by an elodea leaf.

Elodea plants transfer the created oxygen from leaves to stem during photosynthesis. A small amount of oxygen escapes from the leaves to generate oxygen bubbles in the water, but the majority of oxygen leaves the stem because the intracellular air spaces in the stem are greater.

The oxygen that surges up from an underwater plant's leaves. Plants create food and oxygen from carbon dioxide and water through a process known as photosynthesis.

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The student at the lab table near you spills a liquid corrosive chemical on his arm. flush the burn with water would you do first  option (C)

The first step in treating a chemical burn is to flush the affected area with water for at least 20 minutes. Therefore, the correct answer is option c) flush the burn with water. This will help to remove any remaining chemical and minimize the extent of the burn.

Option a) remove the chemical with a clean cloth may further spread the chemical and cause more harm. Option b) put a sterile dressing over the burn site may be done after flushing with water to prevent contamination but should not be done first. Option d) have the person immediately remove contaminated clothes can be done after the flushing of the affected area.

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Explanation: Ammonia has pretty strong intermolecular forces because it can form hydrogen bonds, however it can't form as many hydrogen bonds per molecule as water and so its boiling point and melting point are lower.

As ammonia has less intermolecular force of attraction, it have usually low boiling point.

Hydrogen bonding is not a covalent bond to a hydrogen atom, but rather a type of dipole-dipole attraction between molecules.

The attractive force between a hydrogen atom covalently bonded to a very electronegative atom such as an N, O, or F atom and another very electronegative atom causes it.

When a hydrogen atom bonded to an electronegative atom approaches another electronegative atom, strong intermolecular forces are created.

Simple molecules include hydrogen, ammonia, methane, and pure water. All of them have strong covalent bonds among both their atoms but much weaker intermolecular forces.

When one of these substances melts or boils, the weak intermolecular forces, not the strong covalent bonds, break.

Thus, ammonia usually have low boiling point.

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