why must the cu(io3)2 solution be saturated in this experiment

Answer:

Because the opposite charge between them

Explanation:

Answer:

PV=nRT

0.20×v = 0.070×8.00

0.20V= 0.56

0.20v÷0.20v = 0.56÷0.20v

= 2.8

Answer:

Decompositon

Explanation:

Sodium chlorate → Sodium Chloride + Oxygen

Sodium chlorate is reactant.

Sodium chloride + Oxygen is the product.

Definition : -

Decomposition reaction is a chemical reaction in which a single reactant breaks down to simpler products.

Answer:

See attached image.

Explanation:

To determine the amount of water and methane needed, we can set up a system of equations based on the desired composition of the mixture. you should use 36 gallons of water and 54 gallons of methane to obtain a mixture of 90 gallons with a methane concentration of 60%.

Let's assume x represents the number of gallons of water and y represents the number of gallons of methane. We have the following information: The total volume of the mixture is 90 gallons: x + y = 90. The mixture should be 60% methane: (y / (x + y)) * 100 = 60. Simplifying the second equation: y / (x + y) = 0.6. Now we can solve the system of equations: From equation 1, we can express x in terms of y: x = 90 - y. Substituting this into equation 2: y / ((90 - y) + y) = 0.6. Simplifying further: y / 90 = 0.6. Solving for y: y = 0.6 * 90. y = 54. Now we can find x using equation 1: x = 90 - y. x = 90 - 54. x = 36. Therefore, you should use 36 gallons of water and 54 gallons of methane to obtain a mixture of 90 gallons with a methane concentration of 60%.

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Answer:

Explanation:a

Scientific predictions are best described as consistent data that are presented in the form of if and then. It is a solution to the problem that may be identified. Thus, option a is correct.

Scientific prediction is a statement that describes the events of the future that are not always correct or incorrect. In scientific research, the experiment is conducted based on the hypothesis to draw conclusions and results that are expected.

The expected results are said to be scientific predictions when they are represented in the form of "if and then" before the analysis of the experimental method and its result are done. It is an account of the events that may possibly take place under specific conditions.

Therefore, option A. scientific prediction is an expected problem.

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To determine the terminal velocity of materials falling through water, we need to calculate the Reynolds number for each material and compare them. The material with the lower Reynolds number will have a lower terminal velocity and will arrive first. Given the particle sizes of 0.15 mm and 30 mm, and the properties of water, we can calculate the Reynolds numbers and determine which material will arrive first.

The terminal velocity of a particle falling through a fluid depends on the balance between the gravitational force acting on the particle and the drag force experienced due to the fluid resistance. The drag force is determined by the properties of the fluid and the shape, size, and velocity of the particle.

In this case, we have two materials of different sizes falling through water. We can calculate the Reynolds number for each material using the formula Re = (ρvd)/μ, where ρ is the density of water, v is the velocity, d is the diameter of the particle, and μ is the viscosity of water.

For material 1 with a diameter of 0.15 mm, we can calculate its Reynolds number. Since we don't have the velocity, we cannot directly determine the terminal velocity. However, we can compare it to material 2.

For material 2 with a diameter of 30 mm, we can calculate its Reynolds number and compare it to material 1. Since material 2 has a larger diameter, it will likely have a higher Reynolds number and a higher terminal velocity compared to material 1.

Therefore, material 2 with a diameter of 30 mm will arrive first because it has a higher terminal velocity due to its larger size, as determined by its higher Reynolds number.

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The dot structure that can be shown to be incorrect is the dot structure that has been shown by option A

The Lewis structure is based on the concept that atoms tend to gain, lose, or share electrons in order to achieve a stable electron configuration similar to that of a noble gas. In the Lewis structure, the valence electrons of the atoms are represented as dots around the symbol of the atom.

We can see that in the dot structure that is in option A the both atoms are coming from the hydrogen atoms and shoud not be differently marked.

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Answer:

magnesium and oxygen

Explanation:

Answer : The initial concentration of HI and concentration of HI at equilibrium is, 0.27 M and 0.386 M  respectively.

Solution :  Given,

Initial concentration of H_2 and I_2 = 0.11 M

Concentration of H_2 and I_2 at equilibrium = 0.052 M

Let the initial concentration of HI be, C

The given equilibrium reaction is,

    H_2(g)+I_2(g)\rightleftharpoons 2HI(g)

Initially               0.11   0.11            C

At equilibrium  (0.11-x) (0.11-x)   (C+2x)

As we are given that:

Concentration of H_2 and I_2 at equilibrium = 0.052 M  = (0.11-x)

The expression of K_c will be,

K_c=\frac{[HI]^2}{[H_2][I_2]}

54.3=\frac{(C+2(0.058))^2}{(0.052)\times (0.052)}

By solving the terms, we get:

C = 0.27 M

Thus, initial concentration of HI = C = 0.27 M

Thus, the concentration of HI at equilibrium = (C+2x) = 0.27 + 2(0.058) = 0.386 M

Answer:

90.71 KJ

Explanation:

From the reaction equation, lead is the cathode while copper was the anode.

Hence;

E°anode = +0.34V

E°cathode = -0.13 V

E°cell =E°cathode - E°anode

E°cell = -0.13 V - 0.34V

E°cell = -0.47 V

But;

ΔG° = -nFE°cell

n= number of electrons transferred = 2

F = Faraday's constant = 96500 C

E°cell = -0.47 V

ΔG° = -(2 * 96500 * (-0.47))

ΔG° = 90,710 J or 90.71 KJ

The standard Gibbs free energy for the reaction

Pb²⁺(aq) + Cu(s) → Pb(s) + Cu²⁺(aq) is 89.3 kJ/mol.

Let's consider the following redox reaction.

Pb²⁺(aq) + Cu(s) → Pb(s) + Cu²⁺(aq)

We can identify both half-reactions.

Reduction (Cathode): Pb²⁺(aq) + 2 e⁻ → Pb(s)    E°red = -0.126 V

Oxidation (Anode): Cu(s) → Cu²⁺(aq) + 2 e⁻       E°red = +0.337 V

We can calculate the standard potential of the cell (E°cell) using the following expression.

E°cell = E°red,cathode - E°red,anode = -0.126 V - 0.337 V = -0.463 V

The standard Gibbs free energy (ΔG°) is a way to measure the spontaneity of a reaction. We can calculate it using the following expression.

ΔG° = − n × F × E°cell =

ΔG° = − 2 mol × (96,485 J/V.mol) × (-0.463 V) × (1 kJ/1000 J) = 89.3 kJ/mol

where,

Since ΔG° > 0, the reaction is not spontaneous.

The standard Gibbs free energy for the reaction

Pb²⁺(aq) + Cu(s) → Pb(s) + Cu²⁺(aq) is 89.3 kJ/mol.

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Km, also known as the Michaelis constant, is a measure of the affinity between an enzyme and its substrate. The correct answer is: a. Km is the concentration of substrate where the enzyme achieves 1/2 vmax.

It represents the concentration of substrate at which the enzyme achieves half of its maximum reaction velocity (vmax). In other words, Km indicates the substrate concentration required for the enzyme to be half-saturated.

b. Ks, or substrate dissociation constant, is a term used in the context of enzyme-substrate binding. It represents the equilibrium constant for the dissociation of the enzyme-substrate complex into the enzyme and substrate. Ks is different from Km, which specifically measures the substrate concentration needed for the enzyme to achieve 1/2 vmax.

c. Km does not measure the stability of the product. Km is not related to the stability of the product. It is solely focused on the relationship between the enzyme and substrate, specifically the affinity of the enzyme for the substrate.

d. This statement is incorrect. In fact, Km is low if the enzyme has a high affinity for the substrate. A low Km value indicates that the enzyme requires a low concentration of the substrate to achieve 1/2 vmax, meaning it has a high affinity for the substrate. Conversely, a high Km value indicates that the enzyme has a low affinity for the substrate and requires a higher concentration of the substrate to achieve 1/2 vmax.

Hence, e is the correct option.

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The protein's specific volume (0.73 mL g-1 for -lactoglobulin).

Enzyme-containing proteins help speed up the metabolism, or chemical changes, in our bodies. While some compounds are decomposed, others have been produced. Everything that is alive contains enzymes. Naturally, our bodies produce enzymes.

For instance, the enzyme pepsin is a vital component of gastric fluids and aids in the breakdown of food particles in the belly. Similar to how amylase, an enzyme found in saliva, turns starch into glucose to aid in the first stages of digestion. The thrombin enzymes is employed in medicine to speed up the healing of wounds.

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The leaves of plants primarily serve to photosynthesize and require water conducted by the root to do so.

As a leaf of a plant running low on supplies that the root is responsible for, what I will be needing is water.

Thus, I will have to send a text message to the root to supply me with water. The root will respond by asking its foot soldiers (the root hairs) to conduct water into the root.

Once water gets into the root, it enters special cells that are responsible for conducting water inside plants - the xylems. The root sends the water through the xylem and water travels from there to me - the leaf.

Once the water gets to me, I will use it in combination with inorganic carbon (carbon dioxide) to synthesize carbohydrates.

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Answer:

S Atomic mass:  32.06 AMU

Al Atomic mass:  26.98 AMU

S Molar mass:    32.06 g/mole

Al Molar mass:​    26.98 g/mole

Explanation:

The Periodic Table has the unique property that the atomic masses are numerically the same as the molar masses. Thus, g/mole may be subastituted for AMU:  they are equivalent.  Just change AMU to g/mole.

The effect of changing the temperature of the nitric acid on the rate of reaction. (Include measuring the volume of carbon dioxide gas produced) is Rate of reaction increases.

When we increase the temperature of the reaction the rate of reaction also increases. With the increase of the temperature of the nitric acid HNO₃, the rate of the reaction also increases as the molecule moves faster. Arrhenius equation given as :'

k = Ae^(Ea / RT)

or, ln k = -Ea /RT + ln A

where,

k = rate constant

A = Arrhenius constant

Ea = activation energy

R = gas constant

T = temperature

Thus, The effect of changing the temperature of the nitric acid on the rate of reaction. (Include measuring the volume of carbon dioxide gas produced) is Rate of reaction increases.

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Explanation:

hope this helps you.

The best beaker to represent a solution containing the weak electrolyte H2SO3 (a weak acid) is Beaker A.

This is because the solution will contain hydrogen (H+) and sulfate (SO3-) ions, and the hydrogen ions will be attracted to the partially-filled oxygen atoms in the water molecules, forming hydrogen bonds.

The hydrogen bonds will be weaker than the covalent bonds between the hydrogen and oxygen atoms, making Beaker A the best representation of the solution.

Hydrogen bonds are interactions between molecules that are formed when a hydrogen atom, which is slightly positively charged, is attracted to a slightly negatively charged atom, such as an oxygen or nitrogen atom.

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Answer:

The chemical formula for rust is Fe2O3. Rust is formed when iron reacts with oxygen in moist air. The following chemical equation represents the reaction: 4Fe + 3O2 → 2Fe2O3.

Explanation:

Answer:

8.24 mL

Explanation:

Density can be defined as mass per unit volume, according to the relationship shown in the attached image. Moles (a unit of measurement for small entities) can also be related to mass. Let's look at two formulas which would be useful for answering this question.

\(\boxed{\text{Density}=\frac{\text{Mass}}{\text{Volume}} }\)

\(\boxed{\text{Mole}\times\text{Mr}=\text{Mass (in grams)}}\) , where Mr stands for relative molecular mass

From the periodic table the Mr of nickel is 58.7.

Multiply the number of moles by the Mr:

Mass of Ni

= 1.25(58.7)

= 73.375 g

Calculate the volume of Ni:

Volume

= mass ÷density

= 73.375 ÷8.90

= 8.24 ml (3 s.f.)

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Answer:

1.) Answer: of atoms (molecules)÷ avogadro no. Since one mole is defined as 6.022 x 10^23, and there are two hydrogen per molecule, that would mean that there are exactly 12.044 x 10^23 molecules of hydrogen in one mole of water.

2.)How many moles are in 8.30 X 1023 molecules of H2O? 1.38 moles H2O

3.)1 mol of water contains 6.022 × 1023 H2O molecules Therefore 0.500 mol contains 0.500 × (6.022 × 1023) = 3.01 × 1023 H2O molecules.

4.)6.02x1023 atoms

5.) 9.03x1023 atoms Hg 9.03x1024 atoms Hg 903 atoms of Hg

6.)6.022×1023

7.)1.51x1023 atoms Rb

8.)0.048 moles

9.)2.04

10.)How many moles are in 5.25 X 1025 atoms of Au? 87.2 moles Au

Explanation:

[Fe(CN)₆]⁴⁻ ion has one unpaired electron with d₆ electronic configuration.

We must take into account the electronic structure of the Fe3+ ion, which has five 3d electrons and no 4s electrons, in order to calculate the number of unpaired electrons in the [Fe(CN)₆]⁴⁻ ion. CN- ligands donate two electrons to form a coordinate covalent bond with Fe³⁺ when they coordinate with the metal ion. Each CN- ligand consequently takes up one of the six coordination sites surrounding Fe³⁺.

The [Fe(CN)₆]⁴⁻ ion has a d₆ electronic configuration, meaning that electrons occupy each of its six d orbitals. When degenerate orbitals are available, electrons first occupy them alone before pairing up, according to Hund's rule. As a result, given that there are six electrons in the d orbitals, we can anticipate that at least one of them will be unoccupied, leading to one unpaired electron.

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The rate of the reaction is 0.0036 mol/(L·s).

The rate of a reaction can be calculated using the formula:

rate = Δ[HCl]/Δt

where Δ[HCl] is the change in concentration of HCl over a period of time Δt.

In this case, the initial concentration of HCl ([HCl]₀) is not given, so we need to calculate it using the given concentration at 19 seconds:

[HCl]₀ = [HCl]ₙ = 0.049 mol/l

Using the concentration at 146 seconds ([HCl]ₙ), we can calculate the change in concentration:

Δ[HCl] = [HCl]ₙ - [HCl]₀ = 0.298 mol/l - 0.049 mol/l = 0.249 mol/l

Δt = 146 s - 19 s = 127 s

Substituting the values in the formula, we get:

rate = Δ[HCl]/Δt = 0.249 mol/l ÷ 127 s = 0.0036 mol/(L·s)

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According to MO theory, when two atomic orbitals overlap, they combine to form an antibonding molecular orbitals that is lower energy and a bonding orbital that is higher energy. The electrons in a molecule are viewed as moving under the influence of the atomic nuclei throughout the entire molecule in molecular orbital theory rather than being allocated to specific chemical bonds between atoms.

The molecular orbitals that encircle and contain valence electrons between atoms in molecules are how quantum mechanics characterizes the spatial and energetic characteristics of electrons. By roughly representing the states of bound electrons—the molecular orbitals—as linear combinations of atomic orbitals, the molecular orbital theory revolutionized the study of chemical bonding (LCAO).

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Answer:

The air pressure in tires increases as the temperature goes up. Scientists have figured out that for every 10 degrees (Fahrenheit) that the temperature rises the tire pressure will increase by one pound per square inch

Explanation:

Answer:

decrease

Explanation:

Answer:

Its l and ll

Explanation:

it doesn't mix with moisture that would be sulfurous smog

Answer: 1 and 3

qwq rawr

Talc is one of the softest minerals. That's the what it is best known for.

Talc is a soft mineral that is composed of magnesium, silicon, and oxygen. It is a type of clay mineral that is known for its softness, smoothness, and ability to absorb moisture. Talc has a chemical formula of Mg3Si4O10(OH)2 and is often found in metamorphic rocks, particularly in regions where there is a lot of magnesium and silica.

Talc is commonly used in various industries, such as in the production of ceramics, paint, paper, and plastics. It is also used as a filler in products such as cosmetics, talcum powder, and pharmaceuticals.

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