You have a sample of an element. At room tempera-
ture, it is a lightweight, brittle solid with a metallic
luster. It has fair conductivity that increases with
increased temperature. Do you think the material is a
metal, nonmetal, or metalloid?
Explain

Answer:

a thing that does things

Explanation:

Answer:

An atom changes from a ground state to an excited state by taking on energy from its surroundings in a process called absorption. The electron absorbs the energy and jumps to a higher energy level. In the reverse process, emission, the electron returns to the ground state by releasing the extra energy it absorbed.

Aspirin is the sector's most regularly used medicinal drug. The chemical analysis of aspirin indicates that the molecule is 60.00% carbon, 4.44% hydrogen, and 35.56%.

Empirical records.relying on revel in or commentary by myself regularly with out due regard for system and theory. an empirical basis for the idea. Empirical research is primarily based on found and measured phenomena and derives information from actual revel in in place of from principle or perception.

An instance of empirical evaluation might be if a researcher changed into inquisitive about locating out whether or not paying attention to satisfied music promotes prosocial behaviour. An experiment might be carried out where one organization of the target audience is uncovered to happy song and the other isn't always uncovered to track at all.

A element is proof for a proposition if it epistemically supports this proposition or suggests that the supported proposition is authentic. evidence is empirical if it's miles constituted by or available to sensory revel in.

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So an atom with a radius of 50 kilometers would be required for a nucleus that was 1 meter in size.

The nucleus is the center of the cell and contains the DNA and other structures that contain the genetic material (such as growth and metabolism). Inside the nucleus, tiny structures known as nucleoli are frequently seen. The gel-like structure within which nuclear components are hung is known as the cell nucleus.

When one look at a photograph of a cell, one of the parts that stands out the most is the nucleus. The nucleus, located at the center of the cell, is home to all of the chromosome, which are responsible for encoding the genetic material. The nuclear envelope, nucleolus, nuclear matrix, nucleosome, and nucleolus are some of the several structures that make up the nucleus.

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The maximum amount of energy produced in this reaction is -1381.58J

What is mole?

It is defined as amount of a substance that contains exactly 6.02 × 10²³ ‘elementary entities’ of the given substance.

b) mole ratio = moles / balanced coefficient

mole ratio of Al = 3.25 mol/2 mol= 1.62

mole ratio of Fe2O3 = 1.92 mol/1 mole = 1.92

here , Al is the limiting reactant because of lower nole ratio, therefore it produces maximum amount of heat

Since 2 mole Al produces ∆H° rxn = -850.2J

1 mole Al produces ∆H° rxn = -850.2J/ 2

3.25 mole Al produce ∆H° rxn = (-850.2J/ 2) × 3.25

= -1381.58J

Hence energy ∆H = -1381.58J

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Here are 3 alkali metals with physical and chemical similarity.

What is alkali metals?

Alkali metals are come from the fact that when these metals or their oxides dissolved in water.a basic solution results.

Three alkali metals -

1- hydrogen(H)

2-lithium(Li)

3-potassium(K)

physical and chemical similarity of hydrogen -

-it is colourless and tasteless in nature.

-it is a combustible gas but not a supporter of combustion.

physical and chemical similarity of lithium -

-it have a melting point of 180.54

-it is the lightest of all metals,with a density approximately half that of water.

physical and chemical similarity of pottasium -

- this metal is soft and white with a silver lustre.

-it imparts a lavender colour to a flame, and it's vapour is green.

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The equation which represents sublimation in the given option is,

H2O(s) → H2O(g).

What is sublimation?

Sublimation is the process of the conversion of substance in solid state directly to gaseous state without going to the liquid state. An example for sublimation is dry ice which is also called as solid carbon dioxide. At ordinary temperature, dry ice gets converted from solid to gaseous form without going through the liquid state.

In sublimation process, the water is in the solid state which is getting converted into the gaseous state which is water vapor. In water, the snow or ice change directly to vapour from solid form.

Hence, water getting converted from solid state to gaseous state is the  sublimation process. Here H2O (s) is getting converted into H2O (g). Therefore, option 2 is the correct answer.

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The number of protons, electrons, and neutrons are 55 p+ 55 e- 55 n. They are subatomic particles in the element. They can be calculated from the atomic number and the mass number.

Every element has a mass number and an atomic number. The number of protons, electrons, and neutrons can be calculated from the mass number and the atomic number.

If given

How many protons, electrons, and neutrons?

Number of protons

= atomic number

= 55

Number of electrons

= atomic number - ion

= 55 - 0

= 55

Number of neutron

= mass number - atomic number

= 110 - 55

= 55

Hence, the number of protons, electrons, and neutrons are 55 p+ 55 e- 55 n.

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The molecule cis-1,2-dibromocyclopentane comes under Stereoisomers.

Stereoisomers are molecules that have the same molecular formula, the same atom connectivity, but they differ in the relative spatial orientation of the atoms.

In cis-1,2-dibromocyclopentane, both bromine atoms are on the same "face" of the cyclopentane ring.

The concentration of the cu2+ in the braker will be 0.068 molar.

Concentration is known as the measure of the relative proportions of two or more quantities in a mixture of solution. Concentration determines the number of molecules are present in the solution. Concentration also determines the acidity and basicity of the solution.

       In the given condition we have 0.068 molar of copper in the solution.

Therefore,

[Cu2+] = 1 molCu(NH3)/ l x 1 mol Cu2+/ 1 moleCu(NH3)

1 molCu(NH3) gets cancelled on both the sides.

as we know, from the given condition [Cu2+] = 0.068 molar

Therefore, 0.068 = 1 mol Cu2+ / l

   Therefore, the concentration in the beaker of the copper will be 0.068molar.

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Daily compounding beats monthly compounding. The shorter the compounding period, the higher your effective yield is going to be.

When interest from the previous day is added, the interest earned each day on your savings account balance is known as daily compound interest. Any frequency plan, ranging from daily to yearly, can be used to compound interest. Interest is accrued daily and paid out monthly on all bank accounts from Marcus by Goldman Sachs. The formula for calculating monthly compounding is the principle amount multiplied by one plus the interest rate divided by a number of periods, which is raised to the power of the number of periods. Lenders frequently prefer to present interest rates compounded monthly instead of annually. The interest amount is obtained by deducting that sum from the principal amount.

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The pH of the solution is 13.16.

We know that the pH has to do with the concertation of  the hydrogen ions that we have in the solution. We have to first obtain the concentration of the hydroxide ions and then use that to obtain the pH of the solution accordingly.

Number of moles of NaOH = 5.80 g/40 g/mol = 0.145 moles

Concentration of the solution =  0.145 moles/1 L =  0.145 M

pOH = - log( 0.145 M)

= 0.84

pH = 14 - 0.84

= 13.16

We can get the pH of the solution as 13.16.

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Two characteristics of liquid oxygen contradict predictions from the valence bond theory that are explained by the molecular orbital theory are:

1) Pale blue color

2) Para-magnetism

The valence bond theory is not able to explain the para magnetic behavior of the oxygen that give pale blue color. This is explained by molecular orbital theory.

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Two reasons for dropwise addition of HCl:

Sodium benzoate, the sodium salt of benzoic acid is widely used as a food preservative and pickling agent. It is a white crystalline chemical with the formula  C₆H₅COONa. Although used as a food preservative, it is generally recognized as safe and can be used as an antibacterial agent and flavoring agent in food at a maximum usage of 0.1%. It is also generally recognized as safe (GRAS) when used as a preservative in animal feed.

For the specific case of your question:

Addition of concentrated hydrochloric acid protonates the sodium salt of the organic acid to produce the organic acid. Organic acids are not soluble in aqueous solutions, they precipitate in solution and can be collected by filtration.

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solid(particles are appropriately packed)  in solids there is no distance between the constituent particles

liquid(particles are closely packed).

gas(particles move freely) .

In a gas, the particles are evenly spaced out and not in any particular order. There is no regular arrangement of liquid next to one another. solids are regularly arranged and closely packed.

We can infer from the diagram that there is no space between the individual particles that make up solids. Without any intermolecular voids between the individual molecules, it is a completely packed structure.

In contrast, the particles in liquids are more closely packed than those in gaseous fluids, albeit they are more loosely packed than those in solids. We can now observe that there is a significant intermolecular gap between the constituent particles of gases. They are packed more flimsily than

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Answer:

4Fe(s) + 3O₂(g) = 2Fe₂O₃(s)

Answer:

4834.20 ml or 4.8342 L

Explanation:

Gold has density of 19.30 g/ml

so according to d = m/V

V = m/d = 93,300/19.30 = 4834.19689119 = 4834.20 ml or 4.8342 L

The volume of nuggets of gold that has a mass of 93,300g is 4834.20 ml or 4.8342 L.

Volume is the space occupied by a three-dimensional object.

Density is the mass per unit volume. Density is a scalar quantity. It is denoted by d and the symbol for density is given as rho, a Greek symbol. Density is calculated as mass divided by volume.

Density is directly proportional to mass and inversely proportional to volume. Thus, with an increase in density, mass increases and volume decreases, and vice-versa

Gold has a density of 19.30 g/ml

so according to density = mass/ volume

V = m/d = 93,300 / 19.30 = 4834.19

4834.20 ml or 4.8342 L

Therefore, the volume of nuggets of gold that has a mass of 93,300g is 4834.20 ml or 4.8342 L.

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The Debye model is a model used to estimate the heat capacity of a solid. The model is based on the assumption that the solid consists of a collection of harmonic oscillators.

The Debye frequency is the frequency at which an oscillator oscillates when it is subjected to a force. The Debye temperature is the temperature at which the Debye frequency is equal to the thermal energy. The Debye model can be used to estimate the heat capacity of a metal, semiconductor, or dielectric.

The heat capacity of a metal is typically higher than the heat capacity of a semiconductor or dielectric. The heat capacity of a metal is also typically higher than the heat capacity of a dielectric. The heat capacity of a semiconductor is typically lower than the heat capacity of a dielectric.

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Nucleus 2: ¹⁸₈F

Nucleus 4: ¹⁹₈F

(Isotopic notation are similar as nuclear notation, or the atomic mass, symbol, and atomic number.)

There is a difference in the rate of mass change because eggs gain mass when kept in hypotonic solution, whereas they lose mass when kept in hypertonic solution.

Hypertonic solutions contain high concentrations of solutes compared to other solutions. The opposite solution with a lower concentration is called a hypotonic solution. Cells are considered hypotonic when placed in a hypertonic solution.

Hypotonic solution refers to a solution that contains a lesser amount of solute than the solute concentration of another solution through a semipermeable membrane.

Thus, eggs placed in high concentrations of sucrose lost the most weight. So the higher the sucrose concentration, the more water the egg will lose.

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Gay-Law Lussac's states that, for a gas with a fixed volume and number of moles, pressure is directly proportional to temperature.

The pressure exerted by the argon gas  at 60c is 0.46atm

Define pressure?

Pressure is defined as the force applied perpendicular to an object's surface per unit area across which that force is dispersed. Gauge pressure (sometimes written gauge pressure) is the pressure in relation to the surrounding atmosphere.

p is proportional to t.

p1xt1=p2xt2

where,

p1 = 0.85 atm

p2 = ?

t1 = 20c

t2 = 60c

t1=20c= (200 +275=475k)

t2=60c =(600+275=875k)

p2 =0.85x473/873

=0.4605atm

Therefore, the pressure of the gas at 60c will be 0.46atm.

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Based on the given specific heat capacity of iron, the molar heat capacity of iron =is 25.18 J/mol/°C.

The molar heat capacity of a substance is the amount of heat required to raise the temperature of a unit mole of that substance by one degree.

The molar heat capacity is given by the formula below:

Given the specific heat capacity of a substance, the molar heat capacity is obtained as follows

Molar heat capacity = specific heat capacity * molar mass

specific heat capacity of iron = 0.4498 J/g/°C

the molar mass of iron = 56 g/mol

Molar heat capacity of iron = 0.4498 J/g/°C * 56 g/mol

Molar heat capacity of iron = 25.18 J/mol/°C

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The list of ionic bonds in order of increasing ionic character is as follows:

Ionic bonds are bonds that are formed between two oppositely-charged ions held together by electrostatic forces of attraction.

The ions that are involved are the positive ions called cations and the negative ions called anions.

The strength of an ionic bond increases with an increase in the ionic character of the ions as well as an increase in the difference in the electronegativity of the ions.

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Ductility is the physical property of matter which indicates ability to be stretched into a wire without breaking.

Due to its physical attribute of ductility, metal will stretch as opposed to breaking when pulled. In other words, a material's ductile qualities are its capacity to experience significant plastic deformation under tensile stress prior to rapture. Nickel, copper, steel, and other ductile materials are examples.

Brittleness is the property of metals that accounts for their breaking under tensile stress without producing stretch. Another name for it is abrupt failure. Glass, iron, and other fragile materials are examples.

The ability of a material to absorb mechanical overload is determined by its ductility, which is a crucial factor in engineering and manufacturing.

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Answer:

Explanation:

As alkali is a base and it produce OH- when disolved in water. So we can say that they are called "alkaline" earth metals because they form "alkaline" solutions, hydroxides, when they react with water . "Earth" was the alchemists term for the oxides of alkaline earth metals.

The molarity of the dilution is 0.01 M.

Parameter

When we fill the flask with the first solution and water until its full, we make a dilution.

The concentration changed when we added water, but the number of moles stay the same.

[tex]M = \frac{n}{V}[/tex]

n₁=n₂

V₁×M₁ = V₂×M₂

5.00×0,100=50×M₂

0.500=50×M₂

[tex]M_2 = \frac{0.500}{50}[/tex]

M₂ = 0,01 M

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During secondary active transport the movement of one substances down it's electrochemical gradient provides the force to move another substance up. both substances move in the same direction the mechanism is referred to as symport.

The secondary active transport the movement of one substances . the movement depends on the two types : symport and the antiport. An antiport is the substance move in opposite direction  in symport the substance move in same direction

Thus, During secondary active transport the movement of one substances down it's electrochemical gradient provides the force to move another substance up. both substances move in the same direction the mechanism is referred to as symport.

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When the mineral grains flatten and align in parallel bands, a type of metamorphic rock called gneiss is created. It is a rock with  mineral grains made up of a variety of minerals.

such as graphite and quartz. High pressure and heat are used to form it. One popular and often found category of metamorphic rock is gneiss. It is created by igneous or sedimentary rock formations that have undergone metamorphic processes at high temperatures and pressure. In contrast to schist, gneiss forms at higher temperatures and pressures.

Compounds found only in living things are typically not considered minerals according to geological definitions. But other mineral grains, like calcite, are frequently biogenic is classified as organic molecules (such as mellite ).

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An oxygen containing compound shows strong, broad ir absorption at 3200 - 3500 cm⁻¹  the functional group present is carboxylic acid

A carboxylic acid is the functional group combine the feature of alcohol and ketones because it has both the OH bond and C=O bond and therefore carboxylic acid show a very strong and broad band covering a wide range between 2800 to 3500 cm⁻¹ for the OH strech and the range 2850 to 3000cm⁻¹ belong to saturated system while peak 3000 to 3100 indicate an unsaturated system and ir absorption is caused by the interaction between the IR electric field vector and the molecular dipole transition moments related to the molecular vibration

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The mass of nitric oxide produced by the reaction of 2.81 grams of ammonia is 1.59 grams.

The equation for the reaction of ammonia and oxygen to produce Nitric oxide and water is,

4NH₃ + 5O₂ → 4NO + 6H₂O

From the reaction we can see,

4 moles of ammonia = 4 moles of nitrix oxide.

Mole of ammonia = moles of nitric oxide.

Moles = reacted/formed mass/ molar mass

Molar mass of ammonia = 17 g/mol.

Molar mass of nitric oxide = 30 g/mol.

Mass of ammonia reacted = 2.81 grams.

Putting values,

2.81 x 17 = Formed mass of nitric oxide x 30

Formed mass of nitric oxide  = 1.59grams.

The mass of nitric oxide formed is 1.59 grams.

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