Rubidium and bromine atoms are depicted at right.
(b) What electronic feature characterizes this pair of ions, and which noble gas are they related to?

Answer:

It's used to make paper.

Explanation:

Plato answer.

Answer:

can you show me a picture of the two spheres thanks!!

Water is unique in that way because of its hydrogen bonds. Unlike most materials, water molecules form an orderly lattice when they freeze. Ice is less dense than water, which means that a given volume of ice has fewer molecules than the same volume of water. As a result, ice floats on water.

When water molecules lose heat, they move more slowly and are more likely to form hydrogen bonds with neighboring molecules. In a liquid, hydrogen bonds are constantly breaking and reforming as molecules move around. However, when water is cooled to 4°C, the hydrogen bonds become more stable and start to arrange themselves into a crystalline structure. The hydrogen bonds lock molecules into place, forming a lattice-like network of hexagonal rings.This crystal lattice has more empty space than liquid water, making ice less dense than water. This makes ice float, which is why ponds and lakes freeze from the top down. If ice were denser than water, it would sink, and the bottom of the pond or lake would freeze first, making it difficult for plants and animals to survive.

Water is unique in that way because of its hydrogen bonds. Unlike most materials, water molecules form an orderly lattice when they freeze. Ice is less dense than water, which means that a given volume of ice has fewer molecules than the same volume of water. As a result, ice floats on water.

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The number indicates neutral on a pH scale is 7. Therefore the correct option is option E.

The acidity or basicity (alkalinity) of a solution is gauged using the pH scale. With 0 being the most acidic and 14 being the most basic, it has a range of 0 to 14.

Since a solution's pH is 7 or higher, it is regarded as neutral because it is neither acidic nor basic. The pH of pure water at normal temperature is 7, which is regarded as neutral.

While bases have a pH above 7, acids have a pH below 7, with lower numbers suggesting greater acidity and higher numbers indicating greater basicity. Therefore the correct option is option E.

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The voltage of the cell is -0.40 V.

A voltaic cell is a device that generates electrical energy from chemical reactions. The cell has two half-cells, one containing an oxidizing agent and the other containing a reducing agent.

The two half-cells are separated by a salt bridge or a porous membrane. The oxidizing agent and the reducing agent react with each other, releasing energy in the form of electrical energy, which is used to power an electrical device.

In this case, we built a voltaic cell using these two half-cells : Cu2+(aq)|Cu(s) and Cr3+(aq)|Cr(s).

The concentration of both ions is 1.0 M.

To find the voltage of the cell, we first need to identify the half-reactions occurring at the two electrodes.

We have the following half-reactions :

Cu2+(aq) + 2e- → Cu(s) E°red = 0.34 V

Cr3+(aq) + 3e- → Cr(s) E°red = -0.74 V

To calculate the voltage of the cell, we use the equation :

E°cell = E°reduction at cathode - E°reduction at anode

E°cell = E°Cu2+(aq)/Cu(s) - E°Cr3+(aq)/Cr(s)

E°cell = (0.00 V - 0.34 V) - (-0.74 V - 0.00 V)

E°cell = -0.40 V

Therefore, the voltage of the cell is -0.40 V.

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(a) Magnesium sulfide (MgS) is expected to have a tetrahedral crystal structure.

(b) Lithium chloride (LiCl) is expected to have an octahedral crystal structure.

(c) Potassium bromide (KBr) is expected to have a cubic crystal structure.

To predict the kind of crystal structure expected for magnesium sulfide (MgS), lithium chloride (LiCl), and potassium bromide (KBr) using the radius-ratio rule, we need to compare the ratio of the radii of the cation and anion with the critical values for different crystal structures.

The radius-ratio rule states that the ratio of the radii of the cation to the anion in an ionic compound determines the type of crystal structure it adopts.

We can find the critical radius ratio values for different crystal structures. Here are the values for some common crystal structures:

Coordination number 6 (octahedral): 0.414 - 0.732

Coordination number 8 (cubic): 0.732 - 1.0

Coordination number 4 (tetrahedral): 0.225 - 0.414

Now let's analyze each compound:

(a) Magnesium sulfide (MgS):

Mg²⁺ ion radius: 0.072 nm

S²⁻ ion radius: 0.184 nm

Radius ratio = (cation radius) / (anion radius) = 0.072 / 0.184 ≈ 0.391

Based on the radius ratio, which is less than 0.414, we can predict that magnesium sulfide (MgS) adopts a coordination number 4 (tetrahedral) crystal structure.

(b) Lithium chloride (LiCl):

Li⁺ ion radius: 0.076 nm

Cl⁻ ion radius: 0.181 nm

Radius ratio = (cation radius) / (anion radius) = 0.076 / 0.181 ≈ 0.420

The radius ratio for lithium chloride is between 0.414 and 0.732. This suggests that lithium chloride (LiCl) adopts a coordination number 6 (octahedral) crystal structure.

(c) Potassium bromide (KBr):

K⁺ ion radius: 0.138 nm

Br⁻ ion radius: 0.196 nm

Radius ratio = (cation radius) / (anion radius) = 0.138 / 0.196 ≈ 0.704

The radius ratio for potassium bromide is within the range of 0.732 - 1.0. This indicates that potassium bromide (KBr) adopts a coordination number 8 (cubic) crystal structure.

In summary:

(a) Magnesium sulfide (MgS) is expected to have a tetrahedral crystal structure.

(b) Lithium chloride (LiCl) is expected to have an octahedral crystal structure.

(c) Potassium bromide (KBr) is expected to have a cubic crystal structure.

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The average atomic mass of a sample of enriched uranium is calculated by multiplying the mass of each isotope by its percent abundance and then adding the products together.

The mass of U-235 is 235.04393 amu and its percent abundance is 78.72%.

The mass of U-238 is 238.05078 amu and its percent abundance is 21.28%.

The average atomic mass of the enriched uranium sample is:

(235.04393 amu * 78.72%) + (238.05078 amu * 21.28%) = 238.0287 amu

Therefore, the average atomic mass of the enriched uranium sample is 238.0287 amu.

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Answer:

C. Glass

Explanation:

Amorphous solids have a non-crystalline structure and no order. In that case, Diamonds, Graphite, and Iron all have a crystalline structure and order. You are left with C as your answer.

9.14moles

According to the Avogadro's constant,

We are to determine the moles of 5.50 x 10^24 molecules of butane. This is expressed as:

Therefore the required mole of butane is 9.14moles

Answer:

Gap 1, S-Phase, Gap 2, Prophase, Metaphase, Anaphase, Telophase, Cytokinesis

Hope this helps.

Answer

1.25M

Explanation

to calculate the molality we use the following equation

Molality = moles of solute / Kg of solvent

step 1: to find the moles of glucose we divide the mass by the Molar mass of glucose

moles = mass (g)/ Molar mass (g/mol)

= 18.0 g / 180,156 g/mol

= 0.0999 moles of glucose

now that we have moles of glucose, the next step is to convert 80.0g of water to Kg of water

1 kg = 1000g

Kg of water = 80g/1000g /kg

= 0.08Kg

Molality = 0.0999 mols / 0.08 kg

= 1.25M

Answer:

a-b and e-f

Explanation:

No change in distance during these periods as there is change in time.

Answer:

\(\huge\boxed{\sf\: e \: -\: f \:\: and \:\: a \: -\: b}\)

Explanation:

The car is not moving / is at rest from section(s) e to f & a to b.

Here, from e to f & a to b, we can see in the distance-time graph that the car shows no motion & is present in the same direction even though the time changes. Hence, we can infer that the car is at rest.

If the line goes up then the speed increases, if it's moving down then the speed decreases & if the line is the same then the car is at rest.

\(\rule{150}{2}\)

Answer:

these are two atoms which have the same number of protons but different number of neutrons

Set of quantum numbers (n,l,m,s) for the outer most shell of aluminum atom is (3,1,-1,+1/2)

Given outermost electron of aluminium,

The electronic configuration of aluminium is 1s², 2s², 2p⁶,3s², 3p¹

The outermost electron will have the configuration 3p¹;

3p¹ ⇒ n = 3, l = 1 (p), ml = -1 (px orbital), s = +1/2;

Therefore we know that the,

⇒ Set of quantum numbers = (3, 1, -1, +1/2)

and as we know the value of m lies between -l and +l

As we know, therefore we get the values of,

n = 3,

l = 1,

m = -1 and

s = +1/2

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Answer:

Explanation:

Cause of conductivity: The delocalised electrons are free to move through the structure, so graphite can conduct electricity.

Cause of being soft: The carbon atoms in graphite are linked in a hexagonal network which forms sheets that are one atom thick. These sheets are poorly connected and easily cleave or slide over one another if subjected to a small amount of force. This gives graphite its very low hardness, its perfect cleavage, and its slippery feel.

:)

The allotropes of carbon are diamond and graphite. The allotropes can have same or different physical or chemical properties. Therefore delocalized electrons and hexagonal sheets are the reason for graphite's electrical conductivity and softness.

Allotropy is a property by which an element exist in more than one form. The different forms of element are called allotropes.

The features of graphite are :

1.Graphite form strong covalent bonds.

2. Graphite has delocalized electrons but they don't have metallic bonding.

3. There are total four electrons per carbon but only three electrons are available for covalent bond. One electron per carbon is responsible for delocalization.

4. Graphite forms a giant structures.

Graphite has delocalized electrons, this is the reason for electrical conductivity. The structure of graphite contains hexagonal shaped sheets which glides over one another, this is the reason for their softness.

Therefore delocalized electrons and hexagonal sheets are the reason for graphite's electrical conductivity and softness.

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The equation which represents an acid-base or a buffer solution is represented below-

pH = pKₐ + log([A⁻]/[HA])

One way to determine the pH of a buffer is by using the Henderson–Hasselbalch equation, which is

pH = pKₐ + log([A⁻]/[HA])

In the above equation, [HA] and [A⁻] refer to the equilibrium concentrations of the conjugate acid–base pair used to create the buffer solution. For the titration of a weak acid with a strong base, the pH curve is initially acidic and has a basic equivalence point (pH > 7). The section of curve between the initial point and the equivalence point is known as the buffer region.

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Chromatography is a method of separating out materials from a mixture.

Aim:  To separate the dye present in ink by the process of evaporation.

Materials required:  Beaker, watch glass, water, ink and stove.

Procedure: Take a beaker and fill it to half its volume with water.  Keep 3, glass on the mouth of a beaker.  Put few drops of ink on the watch glass. Heat the beaker and observe the watch glass.  

Observations:   We observe some fumes coming from the watch glass.   Continue heating till you do not observe any further change on the watch glass.   A small residue will be remained on the watch glass.  

Inference:   We know that ink is a mixture of a dye in water.   The residue remained on the watch glass is the dye present in the ink.

Chromatography is a method of separating out materials from a mixture. Ink is a mixture of several dyes and therefore we can separate those colors from one another using chromatography.

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Answer:

Explanation:

Al(ClO2)3

The toothpick found in a pizza is an example of Physical contamination.

Physical contamination is any physical object, such as hair, wood, glass, plastic, or other foreign objects, that contaminates a food item. These contaminants may be brought in by the individuals preparing the food, by machinery, by packaging, or by the food itself. Physical contamination refers to the presence of unwanted or harmful substances or objects in a material or environment. It can occur in various contexts, including food and beverages, manufacturing processes, laboratory settings, and everyday objects. Physical contaminants can pose health risks, compromise product quality, or affect the safety of a particular environment.

Examples of physical contaminants include Hair, Fingernails, Bandages, Jewelry or jewelry parts (such as beads), Broken glass, staples, etc.

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Answer:

Proteins

Explanation:

Their Function Formation Encoded in mRNA into polypeptide chains of amino acids that produces protein

The ribosome of plant cells are sites for the synthesis of proteins. The correct option is (d).

Ribosomes are organelles that take part in the synthesis of proteins. The prokaryotic cell's ribosomes are smaller than the eukaryotic cell's ribosomes.

Currently, ribosomal RNA is a component of the cell's ribosome or protein-building machinery. The process of making proteins, or translation, is carried out by ribosomes.

The ribosome, which translates the genetic code generated in mRNA into an amino acid sequence, is universally responsible for protein synthesis. The two ribosomal subunits, small and big, come together to form the full ribosome, which is used to produce proteins.

Therefore, the correct option is (d) proteins.

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Answer:

True

Explanation:

Atomic radius can be defined as a measure of the size (distance) of the atom of a chemical element such as hydrogen, oxygen, carbon, nitrogen etc, typically from the nucleus to the valence electrons. The atomic radius of a chemical element decreases across the periodic table, typically from alkali metals (group one elements such as hydrogen, lithium and sodium) to noble gases (group eight elements such as argon, helium and neon). Also, the atomic radius of a chemical element increases down each group of the periodic table, typically from top to bottom (column).

Hence, the atomic radius of phosphorus is smaller than the atomic radius of magnesium. Basically, the atomic radius of phosphorus is 98 pm while the atomic radius of magnesium is 145 pm.

The correct structure that shows two amino acids combine to form a dipeptide when the amino group of one reacts with the acid group of the other is structure A.

When two amino acids combine to form a dipeptide, a peptide bond is formed between the amino group of one amino acid and the carboxyl group of the other amino acid. This forms a long chain of amino acids, which is the basis for proteins.

The resulting structure can be represented as:

H₂N-CHR-CO-NH-CHR-COOH

Where R represents the side chain of the amino acid.

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Complete question:

Two amino acids combine to form a dipeptide when the amino group of one reacts with the acid group of the other. Which structure is correct

The concentration of lead in a saturated solution is 2625.96 g/l.

Saturated Solution:

A saturated solution or vapor contains the highest concentration of a solute or vaporized substance obtainable under specific conditions of pressure and temperature. Although supersaturation (concentration reaches its equilibrium value) can occur under certain circumstances, these solutions or vapors are unstable and spontaneously return to saturation.

A common example of a saturated solution is a state of solution that remains in contact with an undissolved pure solvent until the concentration of the solution no longer changes, and a substance in pure solid or liquid form.

Given : Solubility product of Pb Cl₂ =1.6×10⁻⁵

Now, PbCl₂ dissociates in water as under

Pb Cl₂ ​⇌ Pb 2⁺ +2Cl⁻

∴K(sp) = [S][2S]²

⇒ 1.6×10⁻⁵ = 4S³

S =  \(\sqrt[3]{\frac{1.6 * 10^{-5} }{4} }\)

Or,

S = 9.48moles/ l

   = 9.48 × 277

   = 2625.96 g/l

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Answer:

To test if a lipid is saturated or unsaturated iodine is added. If the iodine changes from brown to clear the lipid is unsaturated. If the iodine does not change colors the lipid is saturated. To test for the degree of lipid saturation iodine is added to the unsaturated lipid.

Explanation:

Using Boyle's law, As pressure is decreased, the volume will increase.

Boyle's Law describes how pressure and volume relate when the temperature is constant.

P1V1 = P2V2

When temperature is kept constant in this equation, pressure and volume have an inverse relationship.

When the volume is reduced, molecules have less room to move and collide more frequently, which raises the pressure. If the volume is increased, the molecules have more room to move, collisions occur less frequently, and the pressure is reduced.

The combined gas law, however, governs the connection between the three quantities when temperature is included.

As the gas volume decreases, the molecules hit the walls more frequently, raising the pressure; conversely, as the volume grows, the molecules must travel farther to contact the walls, reducing the frequency with which they do so and raising the pressure.

According to Boyle's law, a gas's pressure tends to decrease as its volume rises.

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Atomic mass of Sulfur = 32g

32g of Sulfur is one mole.

1g of Sulfur is \( \frac{1}{32} moles \)

96.21g of Sulfur is \( \frac{96.21}{32} moles=> 3moles(appx) \)

Answer:

\(\boxed {\boxed {\sf 3 \ moles \ sulfur}}\)

Explanation:

To convert from grams to moles, the molar mass is used. This value is the number of grams in 1 mole of a substance and it can be found on the Periodic Table. Look for Sulfur or S.

We use this as a ratio.

\(\frac {32.07 \ g \ S}{1 \ mo;\l\ S }\)

Multiply by the given number of grams.

\(96.21 \ g \ S*\frac {32.07 \ g \ S}{1 \ mo\l\ S }\)

Flip the fraction so the grams of sulfur cancel out.

\(96.21 \ g \ S*\frac {1 \ mol \ S}{32.07 \ g \ S }\)

\(96.21*\frac {1 \ mol \ S}{32.07 }\)

\(\frac {96.21 \ mol \ S}{32.07 }= 3 \ mol \ S\)

96.21 grams of sulfur is equal to 3 moles of sulfur.

The complete, balanced chemical reaction for the reaction between gold (Au) and selenic acid (H2SeO4) is: 4Au + 3H2SeO4 → 2Au2(SeO4)3 + H2SO3 + H2O. The coefficients for the reactants and products are as follows: 4 for Au, 3 for H2SeO4, 2 for Au2(SeO4)3, 1 for H2SO3, and 1 for H2O. The type of chemical reaction is a single displacement reaction.

The balanced chemical equation for the reaction between gold (Au) and selenic acid (H2SeO4) is:

4Au + 3H2SeO4 → 2Au2(SeO4)3 + H2SO3 + H2O

In this equation, the coefficient in front of Au is 4, indicating that 4 moles of gold are involved in the reaction. The coefficient in front of H2SeO4 is 3, indicating that 3 moles of selenic acid are present.

On the product side, the coefficient in front of Au2(SeO4)3 is 2, indicating the formation of 2 moles of gold selenate. The coefficient in front of H2SO3 is 1, representing the formation of 1 mole of sulfurous acid. The coefficient in front of H2O is also 1, indicating the production of 1 mole of water.

Based on the reactants and products involved, the type of chemical reaction is a single displacement reaction, as gold displaces hydrogen in selenic acid to form gold selenate.

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