What is the number of lone pairs on the central atom in the lewis structure of icl2- ?

In addition to mass, physicists' two commonly used dimensions to derive additional measurements are length and time.

The SI system's fundamental units are those of the basic physical quantities that are not created from other units. There are seven fundamental units, including the meter, kilogram, ampere, and second. Derived units are those which are calculated and expressed with the help of above mentioned fundamental quantities.

The dimensional formula of any quantity is the expression that specifies the powers to which the fundamental units should be raised in order to obtain one unit of a derived quantity. It is written as [M^aL^bT^x] where a, b, and x are the power to which the fundamental quantity is raised.

Therefore the additional two dimensions used by the physicists to derive additional measurements are length and time.

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Answer:

Noble gases are the least reactive of all elements. That's because they have eight valence electrons, which fill their outer energy level. This is the most stable arrangement of electrons, so noble gases rarely react with other elements and form compounds.

Answer:

y= .31120332x

Answer:

the oil won't disolve in water because the oils resistance keeps it from not deforming

Answer:

Water and oil are incompatible. They are said to be inseparable. This is because water is a polar molecule, which means it has a positive charge on one end and a negative charge on the other.

Explanation:

Assuming that the atom has a neutral charge:

The number of protons is equal to the number of electrons.

The number of neutrons is the mass subtracted by the number of protons.

The atomic number is the same as the number of protons.

Answer:

Protons = 21

Neutrons = 23

Atomic # = 21

The volume of 12-ounce fluid in an aluminum beverage is equal to 0.3552 liters.

We know that a fluid ounce is equal to 29.6 m and 1000 ml is equal to 1 liter in the metric system of units.

Converting 12 fluid ounces into milliliter(ml) by the unitary method:

1 fl ounce = 29.6 ml

1×12 fl ounce = 29.6×12 ml

12 fl ounce= 355.2 ml

Now converting 355.2 milliliters (ml) into Liter by the unitary method:

1000 ml= 1 L

1 ml= 0.001 L

1×355.2 ml= 0.001×355.2 L

355.2 ml= 0.3552 L

Therefore 12 fluid ounces of beverage is equal to 0.3552 Liters in volume.

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A weak acid and its conjugate base are typically present in a buffer solution. When H+ is added to a buffer, the conjugate base of the weak acid accepts a proton (H+), “absorbing” the H+ before the pH of the solution drops significantly. The buffering region is approximately 1 pH unit on either side of the conjugate acid’s pKa. The buffering region’s midpoint occurs when one-half of the acid reacts to dissociation

A titration curve graphically depicts buffer capacity. The middle of the curve is flat because the addition of base or acid has little effect on the pH of the solution. This is known as the buffer zone. When a small amount of acid or base is added to the buffer system.

This portion of the titration curve corresponds to the buffer region: it exhibits the smallest change in pH per increment of an added strong base.

The acid-base properties of the solution are dominated by the equilibrium for dissociation of the weak acid, corresponding to Ka, in the region of the titration curve at the lower left, before the midpoint. The acid-base properties of the solution are dominated by the equilibrium for the reaction of the conjugate base of the weak acid with water, corresponding to Kb, in the region of the titration curve at the upper right, after the midpoint. However, because Ka and Kb are related by Kw, we can calculate one from the other.

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Ounces does an 8 - ton elephant in weight is 256000 ounces.

In the question the values are given as :

number of elephant = 8 ton

ton is measure of weight, and ounce is also a unit of weight.

1 ton = 2000 pounds

1 pound = 16 ounces

1 ton = 32000 ounces

the question is to convert 8 ton into ounces,

to convert 8 ton into ounces , we have

1 ton = 32000 ounces

so , in 8 ton ,we have :

8 ton = 8 × 32000 ounces

          = 256000 ounces.

therefore, 8 ton = 256000 ounces.

Thus , Ounces does an 8 - ton elephant in weight is 256000 ounces.

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1.52 tanks of gas will be used to drive 1600 km.

A certain fuel-efficient hybrid car gets gasoline mileage of 55.0 mpg (miles per gallon).

A gallon is a unit of volume in both the US customary and imperial systems of measurement. The US gallon is defined as 231 cubic inches (3.785 liters).

1 mpg = 0.425143707 km/l; to convert miles per gallon to kilometers per liter .

mileage = 23.38 km/l

volume = 1600 km ÷ 23.38 km/l

volume = 68.43 liters; the amount of gasoline needed the trip

tanks = 68.43 l ÷ 45 l

tanks = 1.52

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manganese(ii) sulfate and chromium(ii) nitrate precipitation reaction takes place.

Manganese(II) sulfate MnSO₄ and chromium nitrate Cr(NO₃)₂ are both water-soluble ionic compounds. When mixed in solution, the following constituent ions are formed:

Mn2+, Cr2+ NO

Possessing relatively good water solubility, manganese(II) nitrate remains dissolved in solution. . However, calcium sulfate is insoluble and common to most ionic compounds that bind Group 2A metal cations and sulfate anions. Therefore, a precipitation reaction takes place. The balanced molecular reaction equation is:

MnSO₄(aq) + Cr(NO₃)₂(aq) → CrSO₄

The ionic formula describes all strong electrolyte species in terms of fully dissociated ionic components.

Mn2+(aq) + SO2(aq) + Cr₂+(aq) + 2N

The net ion equation excludes manganese (II) and nitrate spectator ions.

Dissolution completely dissociates both reactant compounds into their constituent ions, allowing these ions to pair to form two new ionic compound products. A key feature is that one of these products is relatively insoluble in water, which can usually be predicted without calculation. The net ion equation for the precipitation reaction system focuses on the formation of this solid insoluble product so that all spectator ions are removed.

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Answer:Diagram of the nuclear composition and electron configuration of an atom of yttrium-89 (atomic number: 39), the most common isotope of this element. The nucleus consists of 39 protons (red) and 50 neutrons (blue). 39 electrons (green) bind to the nucleus, successively occupying available electron shells (rings).

Explanation:Need brainliest award

Answer:

Explanation:

39

Aluminum is a metal whose temperature rises by 52.0 °C when it absorbs 4680 J of heat in a 100 g sample. It has low density, non-toxicity, high thermal conductivity, good corrosion resistance.

The unknown metal has a mass (m) of 100.g and absorbs 4680 J of heat (Q) resulting in a temperature rise of 52.0 °C (ΔT).

It has low density, non-toxicity, high thermal conductivity, good corrosion resistance, and can be quickly cast, machined, and formed. Non-magnetic and non-flammable. It is the second most malleable metal and the sixth most malleable metal.

Aluminum is a metal with a specific heat capacity of 0.900 J/g.°C.

Specific heat, the amount of heat required to raise 1 gram of a substance by 1 degree Celsius. The units for specific heat are usually calories or joules/grams/Celsius.

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The ion with a mass number of 65, with 36 neutrons and a charge of +1 is Copper (Cu). It has 29 protons and 28 electrons.

An ion is a charged particle formed when an atom loses or gains electrons. When electrons are lost, a negatively charged anion is formed, electrons are gained. a positively charged cation is formed.

The ion in the question has a mass number of 65. This means that the total number of protons and neutrons is 65. To get the number of protons, we subtract the number of neutrons from the mass number. That will give us 29 protons.

From the number of protons, we can identify the element symbol. The number of protons equal to the atomic number. Hence, the ion has an atomic number of 29. On the periodic table, the element with an atomic number of 29 is Copper (Cu). It also has a charge of +1, meaning that it has given out one electron. Therefore, it will have 28 electrons instead of 29.

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Option D) is the correct option. The role of the catalyst is to provide a new pathway for the reaction to take place which has lower activation energy.

The function of the catalyst is to change the rate of reaction without interfering with the reaction itself or without getting consumed in the reaction itself.

Catalyst only affects the activation energy of the reaction and does not change the enthalpy difference of the reaction. In other words, the final and initial energy of the product and reactant respectively remains the same even in presence of the catalyst.

In options C) and B) the final and initial energy of the reaction is different for both pathways, hence these are incorrect.

In option A) the activation energy of the uncatalyzed reaction is less than the catalyzed one which is not possible.

Therefore Option D) is the correct reaction pathway showing the effect of catalyst on an uncatalyzed reaction.

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Your question was incomplete. Please check below the full content

The element iodine appears in Period 5 of the Periodic Table. This means that an iodine atom has five orbitals in its electron cloud. so the correct option is (b).

As a member of group 7, iodine possesses seven outer electrons. Since it is in the fifth period, its electrons will be in orbitals 5s and 5p. The chemical formula for iodine is 5s25px25py25pz1.

total amount of electrons that could occupy each orbital

Again using iodine as an example, we can observe on the periodic table that it has an atomic number of 53. ( In neutral state it contains 53 electrons). The configuration of the entire electron cloud is 1s22s22p63s23p64s23d104p65s24d105p5.

Iodine is a trace element that can be found as a dietary supplement, as well as naturally in some foods and some forms of salt. Iodine is a necessary component of the thyroid hormones triiodothyronine (T3) and thyroxine (T4) (T3).

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Three samples of sodium chloride are analyzed and found to contain differing percent by mass of chlorine this indicates that only one solution has actual content of chlorine.

There may be differential volume of chlorine in sodium chloride solution in Nacl the mass percent of chlorine should be 60.8%.

With respect to 1 mole sodium chloride,

Mass of sodium in sodium chloride =23 g

Mass of chloride in sodium chloride =35.5 g

Total mass of sodium chloride =58.5 g

% of chlorine in NaCl =

58.5/35.5×100 = 60.85

​

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The chemical energy contained in gas changed into energy to run the car. The plants store chemical energy produced during photosynthesis. Mr. Tracy had the energy to pick up the plants and carry them to the car because of the chemical energy stored in foods.

Mr. Tracy drove to the nursery to buy plants for his garden. While driving, the chemical energy stored in the gas present in the gas tank in his car is burned to produce energy that drives the engine of the car.

The plants that Mr. Tracy was going to buy store chemical energy through the production of carbohydrates via the process of photosynthesis. Mr. Tracy had the energy to pick up the plants and carry them to the car because of the energy stored in foods.

The foods are oxidized during respiration to unlock the energy and convert them to usable energy by the body, usally in the form of ATP. Respiration involves series of steps, including the conversion of glucose to pyruvate molecules and the conversion of the pyruvates to carbon dioxide and water.

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Answer:

Reactants are starting materials and are written on the left-hand side of the equation. Products are the end result of the reaction and are written on the right-hand side of the equation.

The layer of ethyl alcohol forms on the surface if some ethyl alcohol is poured into the container after the ice cube has melted.

The density of a substance is its mass per unit volume.

The SI derived unit for density is the kilogram/cubic meter, but chemist usually use gram per cubic centimeter.

Ethyl alcohol has lower density of water, so it would form on the surface.

The density of the water is an around 1000 kg/m³.

Mass is a fundamental measure of the amount of matter in the object.

Volume is the amount of space that a substance occupies.

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The approximate age of the boat by radiocarbon dating is 2660 years.

Radiocarbon dating, often known as carbon-14 dating, is a technique for determining an age that relies on radiocarbon's reduction to nitrogen. Neutrons combine with nitrogen-14 in the Earth's atmosphere to form carbon-14, which is a process that occurs frequently in nature. The neutrons needed for this reaction are created when cosmic rays impact the atmosphere.

The radiocarbon found in atmospheric carbon dioxide molecules enters the biological carbon cycle when green plants take it in from the air and then pass it on to animals through the food chain. A living thing's radiocarbon steadily deteriorates, and as long as it consumes food or air, the lost radiocarbon is constantly replaced. However, as an organism passes away, it can no longer take in carbon-14, therefore the amount of radiocarbon in its tissues steadily decreases.

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Biochemical sequences that are similar to one another are found via BLAST. The application calculates the statistical significance by comparing nucleotide or protein sequences to sequence databases.

Advantages

1) Creating phylogeny

2) DNA analysis

Disadvantages

1) You require repeatable, unbiased outcomes.

2) Finding small sequences can be challenging

In addition to assisting in the identification of gene family members, BLAST can be used to infer functional and evolutionary links between sequences.

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If 1 mL of diamond has a mass of 3.51 g and 1 carat = 0.200 g, cullinan diamond is of 2795.7 carats.

Given,

Volume of uncut diamond is 177mL

1mL = 3.51 gram

and 1 carat = 0.200 gram

then we have to find out weight of cullinan diamond in carats.

Cullinan diamond is of 177mL volume that means

177 × 3.51 = 621.27 grams

If 1 carat = 0.200grams

then 1 gram = 4.5 carats

621.27 grams = 621.27 × 4.5 = 2795.7 carats

Hence, cullinan diamond is of 2795.7 carats.

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The density of the liquid is 0.79.

Density can be determined by the ratio of mass and volume of a particular substance. It can be denoted by the symbol d. The concept of density is crucial because it enables us to predict which compounds will float and which ones will sink in a liquid. As long as an object's density is lower than that of the liquid's density, it will often float.

Density can be determined by the formula:

Density = mass / volume.

Given data:

Volume = 35.20mL

Mass = 28.54 g

Put the values of given data in above formula:

Density = 28.20 / 35.54

Density = 0.79 m³

Therefore, the density of the liquid will be 0.79.

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The density of a liquid if a 35.2 mL sample has a mass of 28.548 g is 0.811 g/mL.

What is density?

Density is defined as the mass of the substance per unit of volume. It can be understood by the mass of a substance divided by its volume. Density is denoted using symbol ρ. Density of a liquid can be calculated by -

                                      ρ = m

                                             v

where,

ρ = density

m = mass

v = volume

Density is a physical property of a matter. Higher the density of a substance, higher will be its mass and volume. As long as an object's density is lower than that of the liquid's density, it will often float.

To calculate density of given liquid -

we have,

mass = 28.548 g

volume = 35.2 mL

Using the formula,

         Density =   mass  

                           volume

                    ρ = 28.548

                            35.2

                    ρ = 0.811 g/mL

Therefore, density of liquid is 0.811 g/mL or m³

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Answer:

57

Explanation:

When compounding a sterile product, you should keep all supplies and manipulations at least  6 inches within the hood from all walls (including the filter) and the front edge of the hood.

What does a sterile compounding room mean?

A well-lit buffer space, an ante area, a storage area for sterile supplies and products, and both are secondary engineering controls are all included in the sterile compounding area. An space where a PEC is situated and where operations like preparation, compounding, and staging of CSPs take place is referred to as a buffer area (or "cleanroom").

When preparing a sterile product, you must keep all materials and operations at least 6 inches away from the hood's front edge, all walls (including the filter), and all manipulations.

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The pH of a mixture of 0.25 m acetic acid (CH3COOH) and 0.1 m sodium acetate (CH3COO- Na ) in a total volume of 1 l is 4.37.

The above situation represents a case of buffer solution.

Buffer solutions are those solutions that can resist change in their pH if any acid or base is added to them.

To calculate the pH of a buffer solution, the Henderson-Hasselbalch equation is used

pH = pKa + log [Salt]/[Acid]

Putting

pKa = 4.76

[Salt] = Concentration of sodium acetate = 0.1 M

[Acid] = Concentration of acetic acid = 0.25 M

pH = 4.76 + log [0.1]/[0.25]

pH = 4.76 + log[0.4]

pH = 4.76 - 0.39

pH = 4.37

Hence, the pH of a mixture of 0.25 m acetic acid (ch3cooh) and 0.1 m sodium acetate (ch3coo- na ) in a total volume of 1 l is 4.37.

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The empirical formula of the original compound given the combustion analysis data is CH₂O

Mass of C = (12 / 44) × 51.29

Mass of C = 13.99 g

Mass of H = (2 / 18) × 20.99

Mass of H = 2.33 g

Mass of O = (mass of compound) – (mass of C + mass of H)

Mass of O = 35 – (13.99 + 2.33)

Mass of O = 18.68 g

Divide by their molar mass

C = 13.99 / 12 = 1.1658

H = 2.33 / 1 = 2.33

O = 18.68 / 16 = 1.1675

Divide by the smallest

C = 1.1658 / 1.1658 = 1

H = 2.33 / 1.1658 = 2

O = 1.1675 / 1.1658 = 1

Thus, the empirical formula of the compound is CH₂O

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The reaction that occurs is:

2K (s)+H2O (l)→2KOH (aq)+H2 (g)

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The acceleration of the object is 12 m/s².

Given:

Force = 72N

Mass = 6 kg

To calculate acceleration apply the formula,

Acceleration = Force/mass

                     = 72N / 6kg

                     = 12 m/s²

Therefore, the acceleration of the object is 12 m/s².

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