Is each of these statements true? If not, explain why.(e) If reactant molecules collide with greater energy than the activation energy, they change into product molecules.

Bar graph is the best type of graph to use if you are trying to compare quantities for four separate options that are not related to the dependent or independent variables and that are not measured over time.

Bar graphs are the type of graph that can be used when the data measurement between different variable are not continuous or not measured over time.

The advantages of bar graphs include the following:

Therefore, Bar graph is the best type of graph to use if you are trying to compare quantities for four separate options that are not related to the dependent or independent variables and that are not measured over time.

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The atom that moves at its rms velocity at 100°C with a wavelength of 2.31 * 10 m is : SULPHUR ( s )

To determine the atom we will have to determine the molar mass of the atom

Applying De Broglie equation

λ = h / mv

Vrms = \(\sqrt{\frac{3RT}{M} }\)  ---- ( 1 )

Where : λ  = 2.31 * 10⁻¹¹,  R = 8.314 J / k.mol,  T = 373 K, h = 6.626 * 10⁻³⁴ J.s

From equation ( 1 )

M = ( h² Ua ) / 3RT*λ² --- ( 2 )

where : Ua ( mass of an atom ) = 6.022 * 10²³,  h = 6.626 * 10⁻³⁴,  R = 8.314 J / k.mol, λ  = 2.31 * 10⁻¹¹,    T = 373 K

Insert values into equation ( 2 )

M ( molar mass ) = 32 g/mol

Sulphur has a molar mass of 32 g/mol therefore the atom is sulphur.

Hence we can conclude that The atom that moves at its rms velocity at 100°C with a wavelength of 2.31 * 10 m is : SULPHUR ( s ).

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Answer:

C

Explanation:

This is the only option that gives the right option as in redox reaction electron are lost and gained by different atoms. Not shared or not needed are not right

Nuclear reactions are fundamental processes that involve changes in the nucleus of an atom. They involve the conversion of one nucleus into another by emission or absorption of particles or energy. The equations for these reactions are used to describe the reactants, products, and the particles involved in the reaction.
The balanced equations for the following nuclear reactions are

(a)Th-232 → He-4 + Ra-228

(b)Zr-86 + e- → Nb-86 + νe

(a) The naturally occurring thorium-232 undergoes alpha decay, which means it releases an alpha particle consisting of two protons and two neutrons. The balanced equation for this reaction can be written as follows:

Th-232 → He-4 + Ra-228

In this equation, the atomic number and mass number are conserved on both sides. Thorium-232 has an atomic number of 90 and a mass number of 232. The alpha particle has an atomic number of 2 and a mass number of 4, while radium-228 has an atomic number of 88 and a mass number of 228.

(b) Zirconium-86 undergoes electron capture, which means it captures an electron from its outer shell and combines it with a proton to form a neutron. The balanced equation for this reaction can be written as follows:

Zr-86 + e- → Nb-86 + νe

In this equation, the atomic number is conserved on both sides. Zirconium-86 has an atomic number of 40, and after capturing an electron, it becomes niobium-86, which has an atomic number of 41. The electron captured is represented by e-, while νe represents the neutrino emitted during the reaction.

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The bromination of substituted benzenes is defined as an electrophilic aromatic substitution reaction.

In an electrophilic aromatic substitution (EAS) reaction, an electrophile attacks an aromatic ring and substitutes one of the hydrogen atoms. In the case of bromination of substituted benzenes, a bromine atom (Br) acts as the electrophile and replaces a hydrogen atom on the benzene ring. The reaction proceeds through several steps. First, the bromine molecule is activated by a Lewis acid catalyst, such as iron or aluminum chloride, to generate an electrophilic bromonium ion. This bromonium ion then attacks the electron-rich aromatic ring, forming a sigma complex. The sigma complex is unstable and quickly rearranges, expelling a proton and regenerating the aromaticity of the benzene ring. Finally, a bromide ion (Br-) deprotonates the sigma complex, resulting in the substitution of a hydrogen atom with a bromine atom.

Overall, the bromination of substituted benzenes is a classic example of an electrophilic aromatic substitution reaction, where an electrophile (bromine) substitutes a hydrogen atom on an aromatic ring.

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Answer:

7.5g/mL

Explanation:

Density = Mass/Volume

             = 150.0g/20.0mL

             = 7.5g/mL

The density of the metal is 1800 kg/m^3.

To find the density of the metal in kg/m^3, we need to convert the volume and mass to the appropriate units.

The volume of the metal is given in cm^3, but we need to convert it to m^3:

25 cm^3 = 0.000025 m^3

The mass of the metal is given in grams, but we need to convert it to kilograms:

45 g = 0.045 kg

Now we can use the formula for density, which is:

density = mass / volume

Substituting the values we have:

density = 0.045 kg / 0.000025 m^3

density = 1800 kg/m^3

Therefore, the density of the metal is 1800 kg/m^3.

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Answer:

The fixed position that describes the position or velocity of a body is called Vector.

Explanation:

Vector tells the magnitude and direction of an object.

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The law of diminishing marginal rate of substitution indicates that the rate at which one input can be substituted for another decreases as the quantity of one input increases, leading to isoquants being bent toward the origin.

In other words, as the quantity of one good increases, the individual is willing to sacrifice fewer units of the other good to obtain an additional unit of the first good. This reflects a diminishing rate of substitution between the two goods.

The reason why the law of diminishing marginal rate of substitution suggests that isoquants must be bent toward the origin is rooted in the concept of diminishing marginal utility. As more units of a particular input (e.g., labor or capital) are added while holding other inputs constant, the additional output gained from each additional unit of the input will decrease. This diminishing marginal productivity leads to a decreasing MRS.

When isoquants (which represent different combinations of inputs that produce the same level of output) are bent toward the origin, it reflects the fact that as more of one input is used, the amount of the other input that needs to be substituted decreases. This bending signifies the diminishing MRS and captures the idea that a larger quantity of one input can be substituted for a smaller quantity of the other input to maintain the same level of output.

Overall, the law of diminishing marginal rate of substitution indicates that the rate at which one input can be substituted for another decreases as the quantity of one input increases, leading to isoquants being bent toward the origin.

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The Heisenberg Uncertainty Principle states that the sum of a particle's uncertainty in position (x) and uncertainty in momentum (p) cannot be less than a fixed number, h/4:

Δx * Δp >= h/4πh standing in for the Planck constant.By rearranging the formula above, we obtain:Δx >= (h/4π) / ΔpWhen we change the value provided for p, we obtain:x >= (1/44 kg/m/s) / (h/4).We can now substitute the Planck constant, h = 6.626 x 10-34 Js, to get the following result:x >= (1/44 kgm/s) / (6.626 x 1034 Js / 4).Δx >= 5.27 x 10^-10 mTherefore, there is 5.7 x 10-10 metres of absolute minimum uncertainty in the particle's position.

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a) To solve for the k value in the equation T(t) = 70 + 142ekt, we can use the given information that the coffee temperature at 10 minutes was 110°F.

Substituting t = 10 and T(t) = 110 into the equation, we have:110 = 70 + 142ek(10). Subtracting 70 from both sides, we get: 40 = 142ek(10). Dividing both sides by 142, we have: ek(10) = 40/142. Taking the natural logarithm (ln) of both sides, we get: ln(ek(10)) = ln(40/142). Simplifying, we have: k(10) = ln(40/142). Dividing both sides by 10, we get: k = ln(40/142) / 10. Using a calculator, we find that k ≈ -0.0131. b) To find T(t) at 19.5 minutes, we can substitute t = 19.5 into the equation T(t) = 70 + 142ekt: T(19.5) = 70 + 142e(-0.0131)(19.5) Using a calculator, we can evaluate the expression to find T(19.5) ≈ 99.6°F. a) The decay of Lidocaine can be modeled using the equation L(t) = aekt. Given that the half-life of Lidocaine is about 1.5 hours, we can use this information to solve for the k value. Using the half-life formula, we know that: t1/2 = (ln 2) / k. Substituting t1/2 = 1.5 hours, we have: 1.5 = (ln 2) / k. Solving for k, we get: k = (ln 2) / 1.5. Using a calculator, we find that k ≈ 0.4621. b) The exponential model for Lidocaine decay is given by : L(t) = aekt. c) To find how long it will take for the amount of Lidocaine to reduce to 20 mg, we can substitute L(t) = 20 and solve for t. 20 = 200e0.4621t. Dividing both sides by 200, we have: 0.1 = e0.4621t. Taking the natural logarithm (ln) of both sides, we get: ln(0.1) = 0.4621t. Simplifying, we have: t = ln(0.1) / 0.4621. Using a calculator, we find that t ≈ 2.7 hours. Rounded to the tenths, it will take approximately 2.7 hours for the amount of Lidocaine to reduce to 20 mg.

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Answer:

A comet

Explanation:

Comets  travel so fats through the solar system that they melt which give them their glowy tail

Answer:

1387j

Explanation:

i calculated

The number of molecules in 0.25 mole of \(BeCl_2\) is 1.33 x \(10^{25 }\) . Therefore, the correct option is option B.

Everything around us is made up of molecules, which are the basic units of matter. They are essentially composed of two or more atoms connected by chemical bonds. Depending on the molecule, these atoms may be of the same element or distinct elements. In several scientific disciplines, including chemistry, biology, and physics, the study of molecules is essential. Scientists can learn more about the structure and behaviour of molecules and, in turn, learn more about how different substances interact, react, and operate.

0.25 moles x (6.022 x\(10^{23}\) molecules/mol) =  1.33 x \(10^{25 }\) molecules

Therefore, the correct option is option B.

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Answer:

incomplete information data is not complete so that is why we cannot answer it

Answer:

Evaporation

Explanation:

Students are to mix the solvent to dilute completely,and get and evaporation dish,candle(heat),tripod stand...pour the solution in the evaporation dish and place it on tripod stand above the candle wait for some time the water will change into gas and to get the water they have to cover the evaporating and direct it to a different container to get the water and salt

Answer:

125 grams of HNO3

Explanation:

(8.75g N2O) x (1/44g N2O) x (10mol HNO3) x (63.02g HNO3/ 1mol HNO3) = 125g HNO3

In this exercise we have to use our knowledge of chemistry to calculate the final amount in grams for nitrogen monoxide, as:

125 grams of HNO3

Thus, to make these calculations it will be necessary to observe the given equation:

\(4Zn + 10 HNO3 \rightarrow 4Zn(NO3)2 + N2O + 5 H2O\)

So after performing the stoichiometry we can perform the calculations as follows:

\((8.75g N2O) * (1/44g N2O) *(10mol HNO3) * (63.02g HNO3/ 1mol HNO3)\\ = 125g HNO3\)

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The gold atoms in the piece of jewelry most likely originated from a supernova explosion, which occurred in a distant star many years ago.

During the supernova explosion, heavy elements such as gold are produced through a process known as nucleosynthesis. These elements are then scattered throughout space and eventually incorporated into other celestial bodies such as planets and asteroids, which can be mined for their precious metals.

Thus, the gold atoms in the gift may have come from a variety of sources, but most likely were originally made in the heart of a dying star.

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Answer:

Explanation:

Isotopes differ in the number of neutrons; in ions the number of electrons is different from the number of protons. Isotopes are atoms that have the same number of protons but different numbers of neutrons.

Answer:

Metallic character of the element

Explanation:

Answer:

19.3

Explanation:

V=4^3 a^3,  to find volume with sides

p= 1235/64, Mass/ Volume= Density

Diluting a solution does affect the pH, but not the way one might expect

Diluting a solution does affect the pH, but not the way one might expect. The pH of a solution is defined as the negative logarithm of the hydrogen ion concentration [H+], so as the concentration of hydrogen ions changes, the pH changes as well. However, when a solution is diluted, the concentration of hydrogen ions remains the same, while the concentration of all other ions and molecules in the solution decreases proportionally. This means that the pH of the diluted solution remains the same as the original solution. For example, if a solution has a pH of 3 and is diluted by a factor of 10, the [H+] concentration will remain the same, but the concentration of all other species in the solution (e.g., buffer molecules) will decrease by a factor of 10. Therefore, the pH will remain at 3.

In summary, diluting a solution does not affect the pH, but rather, it changes the concentration of all species in the solution proportionally, while the hydrogen ion concentration and thus the pH remain constant

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Answer:

The formula of the compound that forms when Cu2+ combines with bromine ions is CuBr2

Explanation:

The copper ion has a charge of +2, and the bromine ion has a charge of -1.

In order to balance the charges, we need two bromine ions for every copper ion. So the formula is CuBr2.

This compound is also known as copper(II) bromide. It is a white solid that is soluble in water. It is used in a variety of applications, including photography, medicine, and manufacturing.

A pressure of 14.4 kPa is equal to 108.007 mmHg.

The pressure of 14.4 kPa can be converted to mmHg using the conversion factor of 7.50062 mmHg/kPa.

To convert kPa to mmHg, you can multiply the given pressure by the conversion factor:

14.4 kPa * 7.50062 mmHg/kPa = 108.007 mmHg.

Therefore, the pressure of 14.4 kPa is equal to 108.007 mmHg.

In physics, pressure is a measure of the force applied per unit area. The units of pressure can vary depending on the system being used. In this case, kPa stands for kilopascals, which is a metric unit of pressure commonly used in scientific calculations. On the other hand, mmHg stands for millimeters of mercury, which is a unit of pressure often used in the field of medicine.

To convert from kPa to mmHg, we need to use the conversion factor of 7.50062 mmHg/kPa. This conversion factor represents the ratio between the two units of pressure. Multiplying the given pressure of 14.4 kPa by the conversion factor gives us the equivalent pressure in mmHg, which is 108.007 mmHg.

So, in summary, a pressure of 14.4 kPa is equal to 108.007 mmHg.

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Dalton's atomic theory upheld the idea of the indivisibility of the atom and also the idea that atoms combine in whole number ratios.

According to Dalton's theory, atoms can neither be created nor destroyed. This means that we can not split helium atoms into two oxygen atoms. Doing this will imply dividing the atom.

In his theory also, the combination of atoms occur in whole number ratios, this means that an oxygen atom can not combine with 1.5 hydrogen atoms to form water since it is not a whole number ratio.

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Answer:

Catalyst

Explaination:

Answer:1: The two oxygen atoms in a molecule of oxygen gas share their outer electrons. Which type of bond do the oxygen atoms form?(1 point)

Potential

2. What does it mean for a reaction to release energy?

The relative potential energy of the reaction is positive.

3. Heat is added to a chemical system. Which energy will increase?

the kinetic energy of the reactant molecules

4. Carbon monoxide and nitrogen monoxide react to produce carbon dioxide and nitrogen gas. If the system contains platinum, then less energy is required for the reaction to occur. Which term best describes the role of platinum in the system?

Catalyst

5. The two oxygen atoms in a molecule of oxygen gas share their outer electrons. Which type of bond do the oxygen atoms form?

Covalent

Explanation:

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The electrolysis of water involves the passage of an electric current through water, which leads to the splitting of water molecules into their constituent elements, hydrogen and oxygen. The correct answer is (a)

This process occurs through two simultaneous half-reactions at the cathode and anode of the electrolysis cell.

At the cathode, hydrogen ions (H+) are reduced to hydrogen gas (H2) as they gain electrons from the electrode: \(2H+ + 2e-\)→ \(H2\)

At the anode, water molecules (H2O) are oxidized to oxygen gas (O2) and positively charged hydrogen ions (H+):  \(2H2O\)→ \(O2 + 4H+ + 4e-\)

Therefore, the correct answer is (a) hydrogen is reduced; oxygen is oxidized. During the electrolysis of water, hydrogen is reduced at the cathode, while oxygen is oxidized at the anode.

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--The complete question is, what reactions take place during the electrolysis of water?

group of answer choices

a.  hydrogen is reduced; oxygen is oxidized

b. oxygen is reduced; hydrogen is oxidized

c. . oxygen gas is reduced; water is oxidized.

d.  water is reduced; oxygen gas is oxidized.

e. both oxygen and hydrogen are oxidized and reduced.--

Answers are below...and I have answered this question on the basis of above table.

Explanation :-

(a.) Among nonpolar liquids, those with higher molar masses tend to have normal boiling points that are (lower).

(b.) Among compounds of approximately the same molar mass, those with greater polarities tend to have enthalpies of vaporization that are (higher).

(c.) Xe (Xenon), a substance can exist only as a gas at temperatures above its critical temperature. Of the noble gases listed, only Xe has a critical temperature above O°c.

Among nonpolar liquids, those with higher molar masses tend to have normal boiling points that are lower. Among compounds of approximately the same molar mass, those with greater polarities tend to have enthalpies of vaporization that are higher.Xenon can exist only as a gas at temperatures above its critical temperature.

Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.

Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:

1)Molecular compounds where in atoms are joined by covalent bonds.

2) ionic compounds where atoms are joined by ionic bond.

3)Inter-metallic compounds where atoms are held by metallic bonds

4) co-ordination complexes where atoms are held by co-ordinate bonds.

They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.

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Answer:

False

Explanation:

They are called products