Shown in the table below are solubility data for different salts in water at 60oC.
Which salt is most soluble at 60o C?

A, B, C, or D.

(Chart Below:)

The half-life of a radioactive sample that has an initial activity of 880 decays per second and whose activity 40 hours later is 280 decays per second is approximately 88 hours.

The half-life of a radioactive sample is the amount of time it takes for the radioactivity of the sample to decrease to half its initial value.

In other words, if A is the initial activity of a radioactive sample and A/2 is its activity after one half-life, then the time it takes for the activity to decrease to A/2 is called the half-life of the sample.

Now, let t be the half-life of the sample whose initial activity is A and whose activity after time t is A/2.

Then, we have the following formula : A/2 = A * (1/2)^(t/h) where

h is the half-life of the sample and t is the time elapsed.

Let's apply this formula to the given data :

A = 880 decays/s (initial activity)t = 40 hours = 40*60*60 seconds (time elapsed)

A/2 = 280 decays/s (activity after time elapsed)

Substituting these values into the formula, we get :

280 = 880 * (1/2)^(40/h)

Dividing both sides by 880, we get :

1/2^(40/h) = 280/880

Simplifying the right-hand side, we get : 1/2^(40/h) = 0.3182

Taking the logarithm of both sides, we get :

-40/h * log(2) = log(0.3182)

Solving for h, we get :

h = -40/(log(0.3182)/log(2))

h = 87.83 hours

Therefore, the half-life of the radioactive sample is approximately 88 hours.

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Answer:

cation - electron loss hence positive charge

anion - electron gain hence negative charge

The given terms are correctly paired thus: anion is to electron gain while cation is to electron loss.

Ionic bond formation is defined as the formation of an ionic bond during a chemical reaction whereby an atom losses electrons while another gains electrons through transfer of these electrons.

For example in the formation of the compound NaCl. Sodium is the element that donates an electron from its outermost shell to chloride. Therefore, the sodium atom is the cation.

Also the chloride element would accept electron from the sodium, therefore, it is called the anion.

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The chemical formula for aluminum oxide based on ionic bonding from valence electrons is Al₂O₃.

The chemical formula of a compound is a symbolic representation of its chemical composition.

Chemical formulae gives information about the elements that constitute the molecules of a compound and also about the ratio in which the atoms of these elements combine to form such molecules.

In this compound, aluminum (Al) donates three electrons to oxygen (O), resulting in the formation of Al³⁺ cations and O²⁻ anions. The ionic bond is formed between these oppositely charged ions, resulting in the formula Al₂O₃.

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Answer:

1 kg of lead occupies the smallest amount of space of the four substances

Explanation:

The densities of lead, iron, gold, and copper are 11.34 g/cm^3, 7.87 g/cm^3, 19.32 g/cm^3, and 8.96 g/cm^3, respectively. Therefore, the volumes of 1 kg of lead, iron, gold, and copper are:

Volume of 1 kg lead = 1000 g / 11.34 g/cm^3 = 87.94 cm^3

Volume of 1 kg iron = 1000 g / 7.87 g/cm^3 = 126.98 cm^3

Volume of 1 kg gold = 1000 g / 19.32 g/cm^3 = 51.93 cm^3

Volume of 1 kg copper = 1000 g / 8.96 g/cm^3 = 111.84 cm^3

As we can see, a kilogram of lead has the lowest volume of the four substances, with a volume of 87.94 cm^3. This is because lead is the densest of the four substances, which means that it has the highest mass per unit of volume. Therefore, 1 kg of lead occupies the smallest amount of space of the four substances

If some water splashed out of the coffee cup during the transfer of metal washers, it would lead to a decrease in the mass of water in the coffee cup. This would result in a decrease in the total heat capacity of the system, which would affect the final specific heat capacity of the metal.

Specific heat capacity is defined as the amount of heat energy required to raise the temperature of one unit mass of a substance by one degree Celsius. Thus, a decrease in the mass of water in the system would affect the calculation of the heat energy transferred to the metal, which would affect the specific heat capacity calculation of the metal.

Therefore, it is important to ensure that all the water and metal are transferred accurately and completely to obtain precise and accurate results for the specific heat capacity of the metal.

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Answer:

a is true

Explanation:

homogeneous mixtures are mixtures of 2 or more substances that are even throughout ,heterogeneous are mixtures that aren't uniform and can be put back to different parts

Answer:

The protons are located in the nucleus and have a positive charge

Explanation:

The number of the p-orbitals are occupied in a K atom is six p orbitals.

Potassium belongs to an alkali metal with the atomic number is 19 and the atomic mass of 39. The potassium is placed in the first group and the fourth period. The electronic configuration of the potassium is as :

Electronic configuration of potassium = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹

The region or the space around the nucleus in which the probability of the finding of the electron is called as the orbitals. From the electronic configuration, it is clear that 2p and 3p sublevels are the entirely occupied because the each of them has the six electrons.

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Answer:

b

Explanation:

Answer:

6

Explanation:

If there are 6 electrons and it has a balanced charge, there also must be six protons.

The hydrocarbons in the petroleum that are separated into the fractions is by the fractional distillation method.

The Petroleum will be separated into the fractions through the  process called as the fractional distillation. The  Petroleum is heated in  the distillation tower, and making the hydrocarbons will vaporize. The highest temperature is present at the bottom in the distillation tower, and  the lowest temperature is present at the top of the distillation tower.

Therefore at the different heights in the distillation tower, the different temperatures will be present. The vaporized hydrocarbons will rise through the tower and will condense as  the temperature will be decreases.

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The total mass of products, including 10 grams of CO and 90 grams of H2O, is 100 grams.

The total mass of products from burning 100 grams of methane and producing 10 grams of carbon monoxide is 110 grams. To answer question, we'll use the law of conservation of mass, which states that the total mass of reactants equals the total mass of products in a chemical reaction. In this case, 100 grams of methane (CH4) are burned, producing 10 grams of carbon monoxide (CO). We must find the mass of the other product, which is water (H2O). Since we know that 10 grams of CO are produced, the mass of H2O can be calculated as follows: 100 grams (initial mass of CH4) - 10 grams (mass of CO produced) = 90 grams of H2O. Therefore, the total mass of products, including 10 grams of CO and 90 grams of H2O, is 100 grams.

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The point group of 1,2-diiododisilane is \(\(C_{2v}\)\), and it has \(\(B_1\) Si-H\) vibrations that are IR active.

To determine the point group of a molecule, we need to consider its symmetry elements, such as rotation axes, mirror planes, and inversion centres. By analyzing the given diagram of 1,2-diiododisilane, we can identify its point group as follows:

(a) Point Group:

Looking at the diagram, we observe that the molecule possesses the following symmetry elements:

1. A C2 rotation axis passes through the middle of the molecule, bisecting the two iodine atoms.

2. A perpendicular mirror plane that bisects the molecule and passes through the iodine atoms.

Considering these symmetry elements, the point group of 1,2-diiododisilane is \(\(C_{2v}\).\)

(b) IR-Active Si-H Vibrations:

To determine the IR activity of Si-H vibrations, we need to consider the irreducible representations of the vibrational modes under the \(\(C_{2v}\)\) point group.

In the \(\(C_{2v}\).\) point group, the vibrational modes can be classified into three irreducible representations: \(\(A_1\), \(A_2\), and \(B_1\)\). The symmetry labels for the Si-H stretching vibrations can be found by inspecting the reducible representation resulting from the direct product of the vibrational mode with the irreducible representation of the \(\(C_{2v}\).\) point group.

After analyzing the reducible representation, we find that the Si-H stretching vibrations belong to the \(\(A_1\)\) and \(\(B_1\)\) irreducible representations.

Since the \(\(A_1\)\) representation contains symmetric vibrations, which do not change the dipole moment of the molecule, these vibrations are IR inactive. On the other hand, the \(\(B_1\)\) representation contains asymmetric vibrations, which can change the dipole moment of the molecule, making them IR active.

Therefore, in 1,2-diiododisilane, there are \(\(B_1\) Si-H\) vibrations that are IR active.

Therefore,

(a) The point group of 1,2-diiododisilane is \(\(C_{2v}\).\)

(b) There are \(\(B_1\) Si-H\) vibrations that are IR active in 1,2-diiododisilane.

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Note: The correct question would be as

5. (7 points) The following diagram shows one conformation of 1,2-diiododisilane. HASI $14 н (a) What is the point group? (b) How many Si-H vibrations are IR active?

Answer:

Insulator

Explanation:

An eraser can't conduct electricity, which makes it an insulator.

When hydrochloric acid reacts with barium hydroxide, barium chloride and water are produced. The balanced equation for this reaction is: `HCl + Ba(OH)₂ ⟶ BaCl₂ + H₂O `.

This is a neutralization reaction in which an acid and a base react to form salt and water. The acid in this case is hydrochloric acid and the base is barium hydroxide.

Hydrochloric acid (HCl) is a strong acid, which means that it ionizes completely in water. This means that it dissociates into hydrogen ions (H+) and chloride ions (Cl-) when dissolved in water.

The balanced equation for the ionization of hydrochloric acid is: `HCl + H₂O ⟶ H₃O⁺ + Cl⁻ `Barium hydroxide (Ba(OH)₂) is a strong base, which means that it ionizes completely in water.

This means that it dissociates into barium ions (Ba2+) and hydroxide ions (OH-) when dissolved in water. The balanced equation for the ionization of barium hydroxide is:` Ba(OH)₂ ⟶ Ba²⁺ + 2OH⁻`

When hydrochloric acid and barium hydroxide are mixed together, they react to form barium chloride (BaCl₂) and water (H₂O). The balanced equation for this reaction is:` HCl + Ba(OH)₂ ⟶ BaCl₂ + H₂O`

In this reaction, the hydrogen ion (H+) from the hydrochloric acid combines with the hydroxide ion (OH-) from the barium hydroxide to form water.  

The barium ion (Ba2+) from the barium hydroxide combines with the chloride ion (Cl-) from the hydrochloric acid to form barium chloride.

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The man who shifted medical thinking towards chemistry is Paracelsus, a Swiss physician, and alchemist who lived during the Renaissance period. He believed that diseases were caused by chemical imbalances in the body, rather than the traditional theory of humor.

Paracelsus also introduced the concept that "the dose makes the poison," which means that any substance can be toxic if consumed in excessive amounts. This idea revolutionized the field of toxicology and helped scientists better understand the effects of different chemicals on the body. Paracelsus's contributions to medicine and chemistry are widely credited, and his legacy continues to influence modern science today.

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The volume of the bleach solution for 1:10 that should be used is 1,750 mL.

The volume of bleach solution required is calculated using concentration formula as follows;

C1V1 = C2V2

where;

Make the initial volume of the bleach solution the subject of the formula as shown below;

V1 = C2V2/C1

Substitute the given parameters and solve for the initial volume of the bleach solution.

V1 = (35 x 500)/(10)

V1 = 1,750 mL

Thus, the volume of the bleach solution for 1:10 that should be used is 1,750 mL.

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Answer:

gonna check them rn :) youre not d u mb dont worry (:

The osmolarity of the solution is \(0.6 Osm/L.\)

To calculate the osmolarity of a solution, we need to know the total number of particles (ions or molecules) in the solution, expressed in moles, and divide it by the volume of the solution in liters.

In this case, we dissolved 300 mmol of NaCl into 1 liter of water. NaCl dissociates in water to form two ions: Na+ and Cl-. Therefore, the total number of particles in the solution is 2 x 300 mmol = 600 mmol.

To convert mmol to moles, we divide by 1000:

600 mmol = 0.6 moles

Now we can calculate the osmolarity \((Osm)\)of the solution:

\(Osm\) = moles of particles / volume of solution

\(Osm = 0.6 moles / 1 liter = 0.6 Osm/L\)

Therefore, the osmolarity of the solution is\(0.6 Osm/L.\)

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A sample of gas has an initial volume of 5.6 l at a pressure of 735 mmHg. if the volume of the gas is increased to 9.4 l,  its pressure (in atm) is 0.5 atm.

given that :

The initial volume V1 = 5.6 L

The pressure P1 = 735 mmHg = 0.9 atm

The volume V2 = 9.4 L

the pressure P2 = ?

according to the Boyles law :

P1 V1 = P2 V2

P2 = (0.9 × 5.6 )/ 9.4

     =  0.5 atm

Thus, A sample of gas has an initial volume of 5.6 l at a pressure of 735 mmHg. if the volume of the gas is increased to 9.4 l,  its pressure (in atm) is 0.5 atm

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Answer:

The mass of gas is 30.02 g.

Explanation:

Given data:

Volume of gas = 22.4 L

Density of gas = 1.34 g/L

Mass of gas = ?

Solution:

The given problem will be solved through density formula.

Density is equal to the mass of substance divided by its volume.

Units:

SI unit of density is Kg/m3.

Other units are given below,

g/cm3, g/mL , kg/L

Formula:

D=m/v

Now we will put the values in formula.

1.34 g/L = m /22.4 L

m = 1.34 g/L × 22.4 L

m = 30.02 g

The mass of gas is 30.02 g.

The temperature : 263.016 K

Combined with Boyle's law and Gay Lussac's law  

\(\tt \dfrac{P_1.V_1}{T_1}=\dfrac{P_2.V_2}{T_2}\)

P1 = initial gas pressure (N/m² or Pa)  

V1 = initial gas volume (m³)  

P2 = gas end pressure  

V2 = the final volume of gas  

T1 = initial gas temperature (K)  

T2 = gas end temperature  

P1=760 mmHg

V1= 4 L

T1 = 275 K

P2=704 mmHg

V1=4.13 L

\(\tt \dfrac{760\times 4}{275}=\dfrac{704\times 4.13}{T_2}\\\\T_2=263.016~K\)

When mixing and storing materials, volumetric flasks are utilized to determine volumes.

A volumetric flask is a piece of plastic or glass lab equipment used to make solutions. It is applied to prepare a solution with a specific volume. Compared to beakers or Erlenmeyer flasks, volumetric flasks can be used to measure volumes significantly more precisely.

When it's important to know the volume of the mixture being made exactly and properly, a volumetric flask is utilized. Similar to volumetric pipets, the size of a volumetric flask varies according to the solution volume that is being made.

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Answer:

Hey mate.....

Explanation:

This is ur answer.....

Condensation happens when molecules in a gas cool down. As the molecules lose heat, they lose energy and slow down. They move closer to other gas molecules. Finally these molecules collect together to form a liquid.

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Answer: 1,480m/s

Explanation:

Answer:

Electrons

Explanation:

The resulting element after an element with atomic number 104 undergoes alpha decay will have 102 protons.

Alpha decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle, which consists of 2 protons and 2 neutrons (4He). In the given example, the element with atomic number 104 undergoes alpha decay, which means it loses 2 protons and 2 neutrons during this process.

The number of protons determines the atomic number of an element. Therefore, after losing 2 protons due to alpha decay, the resulting element will have an atomic number of 104 - 2 = 102. Thus, the resulting element will have 102 protons.

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