Which of these pairs of elements have the same number of valence electrons? whoever gives an actual answer gets Brainliest!!

The amount of water that must be added to 6.55 g of nacl to make a solution that is 16.2 % by mass at 25c is 33.8grams.

Given, the mass of NaCl = 6.55grams.

given, Percentage by mass of the solution is 16.2%

By percentage by mass formula we calculate the mass of NaCl in the solution.

Percentage by mass of the solution = Weight of NaCl / mass of solution(w) ×100

                                      16.2 = 6.55/ (w) ×100

  on calculating, we get  w = 40.43grams.

Now, mass of the solution = mass of NaCl + Mass of water

                                40.43g = 6.55 + Mass of water

                    Mass of water = 33.8grams.

Thus, the mass of water which can be added to the solution which is 16.2% by mass is 33.8grams.

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The statement that describes how nuclear processes are significant is that they are the only process that can break down elements (option C).

Nuclear processes involves two notable types of nuclear reactions, which are;

Nuclear fission is a nuclear reaction in which a large nucleus splits into smaller ones with the simultaneous release of energy.

On the other hand, nuclear fusion is the combination of the nuclei of small atoms to form the nuclei of larger ones, with a resulting release of large quantities of energy.

Therefore, it can be said that the statement that describes how nuclear processes are significant is that they are the only process that can break down elements.

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The height of the Eiffel tower after increase in temperature will be 321.06548m.

Temperature increased by 17⁰C

original height of tower is 321m

∆T = 17⁰C

We know that coefficient of thermal expansion for steel 12×10-⁶C-1.

The increase in height is given by

∆h = αh∆T

Putting values in the above equation

∆h = 12×10-⁶× 321 × 17

∆h = 0.065484m

therefore, the height after temperature increase by 17⁰c will be 321.06548m

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For units of volume: 1 milliliter is about the volume of a raindrop. 1 cup is about the volume of a school milk carton.

The volume occupied by an object in three dimensions is calculated. It is often quantified mathematically using SI-derived units, such as the cubic meter and liter, or other imperial measures (such as the gallon, quart, cubic inch). The definitions of volume and length have a connection (cubed). Usually, the volume of a container is thought of as its capacity, or the amount of fluid (gas or liquid) that it could hold, rather than the amount of space the container takes up.

Ancient societies used standardized containers, which were later formed from naturally occurring containers, to compute volume. Several three-dimensional shapes have simple mathematical formulas that can be used to calculate their volumes.

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Due to its higher density than water, dichloromethane creates an organic layer below the aqueous layer as opposed to above it as other solvents do.

Which compound is dichloromethane?

Organochlorine chemical dichloromethane (DCM, often known as methylene chloride or methylene bichloride) has the formula CH2Cl2. A common solvent is this colorless, flammable liquid with a sweet, chloroform-like odor. Although it is polar and miscible with many organic solvents, it is not miscible with water.

Methylene chloride, often known as dichloromethane, is an organic halogen compound that is colorless, volatile, and essentially nonflammable. It is frequently employed as a solvent, particularly in paint-stripping formulas.

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If one or more nucleotide pairs are deleted from a DNA strand, this is known as a frameshift mutation

Insertions or deletions in the genome that are not multiples of three nucleotides are referred to as frameshift mutations. They are a particular class of insertion-deletion (indel) alterations that are present in polypeptides' coding sequences. Here, there are no multiples of three in the number of nucleotides that are added to or subtracted from the coding sequence. They may result from really basic alterations like the insertion or deletion of a single nucleotide.

One of the most harmful modifications to a protein's coding sequence is a frameshift mutation. They are quite prone to produce non-functional proteins that frequently interfere with a cell's metabolic processes and result in significant alterations to polypeptide length and chemical makeup. Frameshift mutations can cause the mRNA to stop translating too soon and create an extended polypeptide.

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The Erlenmeyer flask that weighs 88.5 g has a volume of 0.125 L

To solve this problem, we have to do the conversion of units with the given information.

Information about the problem:

By converting the volume units from milliliters (mL) to litters (L), we have:

125 mL * (1 L / 1000 mL) = 0.125 L

0.125 L is equivalent to 125 mL

It is the transformation of a value expressed in one unit of measurement into an equivalent value expressed in another unit of measurement of the same nature.

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Answer:

m³ (cubic metres)

Explanation:

m³ is the SI unit for measuring volume.

Answer:

The SI unit is m³ (cubic meters)

Explanation:

The statements that are true about covalent compounds are;

Covalent compound refer to elements that are bonded by a covalent bond and it is formed when pair valence electrons in atoms are shared among each other. The compounds with covalent bonding are either liquid or gaseous at room temperature. Examples include ammonia.

Therefore, The statements that are true about covalent compounds are;

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If a scientist wanted to compare air quality throughout the united states but was unable to test the air in every city, the scientist could compare the air quality in a sample or subset of cities.

How to check the air quality?

The Air Quality Index, or AQI, is used to gauge air quality. The AQI functions similarly to a thermometer with a range of 0 to 500 degrees. But the AQI is a technique of displaying variations in the quantity of pollution in the air, not changes in temperature.

How do you sample air quality?

Small volumes of air can be collected through air sampling for testing in laboratories. The majority of air sampling techniques use a suction mechanism to draw complete air samples into a bag or container. After that, the bag or container can be sealed before being sent to a lab for analysis.

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The specific heat capacity of the metal having 0.2kg mass is  -125.5 J/kg°C.

The formula to calculate specific heat is

     c = Q / mΔT

     c = 502 / 0.2 (-20)

    c = -125.5

What is specific heat?

The amount of heat required to increase the temperature of 1 gram of a substance by 1 degree Celsius (°C) is known as specific heat. Since water has a higher specific heat than other substances, it requires more energy to raise its temperature.

In order to distinguish between two polymeric composites, specific heat is useful in estimating the processing temperatures and the quantity of heat required for processing.

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Answer:one Proton

Explanation: Since there is only one proton in hydrogen and no neutrons, the atomic mass of the substance is 1. It is 4 for helium: 2 protons and 2 neutrons. The number of neutrons is equal to the number of protons for the majority of the 16 lightest elements (up to oxygen).

Simply transfer the cold plate/processors to the new system board; there is no need to remove the processor or disrupt the thermal material bond from the cold plate.

A cold-water conduit into your CPU is only one form of liquid cooling; there are a few others as well. Some server cabinets have chilled rear doors where cool air is pushed onto the server and cold water is piped through.

Microsoft is one of the IT corporations working with cold plate technology, which uses pipes of liquid to cool servers through metal plates. By employing it to cool the chips that record digital currency transactions, participants in the cryptocurrency business invented liquid immersion cooling for computing hardware.

The water block's coolant absorbs the heat from the CPU. To keep the processor or graphics card cold, a cooling liquid is known as coolant loops around the cooling kit. To remove air bubbles from the liquid as it circulates, the reservoir stores extra coolant.

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Answer:

The nucleus controls and regulates the activities of the cell (e.g., growth and metabolism) and carries the genes, structures that contain the hereditary information. Nucleoli are small bodies often seen within the nucleus. The gel-like matrix in which the nuclear components are suspended is the nucleoplasm.

The strong base has a pH near 14 and the pH of the strong acid is near to 1. If we diluted the solution weak base solution, then the concentration of hydroxide.

Chemistry uses a pH scale to categorize an aqueous solution's acidity or basicity. The term pH originally meant "potential of hydrogen." In comparison to basic or alkaline solutions (solutions with higher H+ ion concentrations), acidic solutions have lower pH values measured.

The p Hscale is logarithmic and inversely proportional to the amount of hydrogen ions present in the solution.

M is equal to mol dm3. At a temperature of 25 °C (77 °F), basic solutions are defined as those with a pH greater than 7, and acidic solutions as those with a pH lower than 7. Solutions having a pH of 7 are regarded as neutral at this temperature (e.g. pure water). Temperature affects the pH's neutral value, which drops to below 7 if the temperature exceeds 25 °C.

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To indicate the quotient of two integers, use fractions.

11/15 of the potato was used.

From the question, we have the following parameters:

1 bag = 15 sweet potatoes

Casserole = 2/5

Pie = 1/3

The fraction of potato used is calculated using:

Fraction =  Casserole + Pie

Take LCM

11/15

Hence, the fraction of potato used is 11/15

There are three different kinds of integers: 0 (zero), positive integers (natural numbers), and negative integers (Additive inverse of Natural Numbers)

The collection of whole numbers and their antipodes is known as the integers. The set of integers does not include fractions or decimals. Integers include, for instance, 2,5,0,12,244,15, and 8.

The number zero (0), a positive natural number (1, 2, 3, etc.), or a negative integer denoted by a minus sign (1, 2, 3, etc.) are all examples of integers.

The inverse additives of the equivalent positive numbers are the negative numbers.

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Based at the Mohs Hardness Scale, Calcite will be scratched via way of means of a penny however now no longer via way of means of a fingernail.

What is mohs hardness scale?

The Mohs scale of mineral hardness is a qualitative ordinal scale, from 1 to 10, characterizing scratch resistance of various minerals via the capacity of more difficult fabric to scratch softer fabric.

Despite its loss of precision, the Mohs scale is applicable for area geologists, who use the size to more or less discover minerals the usage of scratch kits. The Mohs scale hardness of minerals may be generally discovered in reference sheets.

Mohs hardness is beneficial in milling. It lets in evaluation of which type of mill will nice lessen a given product whose hardness is known.[8] The scale is used at digital producers for trying out the resilience of flat panel show components (inclusive of cowl glass for LCDs or encapsulation for OLEDs), in addition to to assess the hardness of contact displays in customer electronics.

Based at the Mohs Hardness Scale, Calcite will be scratched via way of means of a penny however now no longer via way of means of a fingernail.

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Answer:

The atom economy of ethane in this process is 19.72 %.

What is atom economy?

The conversion efficiency of a chemical reaction in terms of all the atoms involved and the desired products produced is known as atom economy (atom efficiency/percentage).

Explanation:

C₁₀H₂₂ → C₈H₁₈ + C₂H₄

Molecular weight of C₁₀H₂₂ = 142.28

Molecular weight of C₈H₁₈ = 114.228
Molecular weight of C₂H₄ = 28.053

% Atom economy =     [tex]\frac {Molecular weight of C2H4} {Molecular weight of C10H22}[/tex]

                             = [tex]\frac{28.053}{142.28}*100[/tex]

                             = 19.716 %

                             ≈ 19.72 %

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Answer:

protons=atomic number

electrons=atomic number-charge

proton=atomic mass-atomic number

Precipitate of SrSO₄ forms in the reaction of SrNO₃(aq) and K₂SO₄(aq) .

Possible pairs of reaction are below.

CsI(aq)+NaOH(aq) → CsOH(aq) + NaI (aq) :: No precipitate

2HCl(aq)+Ca(OH)₂(aq) → CaCl₂(aq) + 2H₂O(l) :: No precipitate

K₂SO₄(aq)+Sr(NO₃)₂(aq) → SrSO₄(s) + 2KNO₃(aq) :: Precipitate of SrSO₄ forms.

NaNO₃(aq)+NH₄Cl(aq) → NaCl (aq) + NH₄NO₃(aq) :: No precipitate

Here, the double-displacement reaction takes place between potassium sulfate and Strontium nitrate, both compounds are very soluble in water. The end products in the reaction are potassium nitrate and Strontium sulfate.

By remembering the solubility rules of nitrates, we infer that all nitrates are soluble.

Here, Potassium sulphate is also soluble, and the solubility rule for sulfates indicates that Strontium sulfate(SrSO₄) is insoluble. Hence, it will precipitate from solution.

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The Ph = 10.3 and S = 8.287 x [tex]10^{-5}[/tex]

CaCO3 → Ca^+2 + [tex]CO_{3} ^{-2}[/tex]

Ksp = [Ca^+2] [ [tex]CO_{3} ^{-2}[/tex]] = s^2

We need to take into account the hydrolysis of carbonate ion with

K2 = 4.1 x [tex]10^{-11}[/tex]

H[tex]w_{3}^{-}[/tex] ⇄ H+ + [tex]w_{3}^{-2}[/tex]

K2 = [tex]\frac{[H+][CO_{3}^{-2}] }{[HW_{3}^{-}] }[/tex]

S = [tex]\sqrt{Ksp}[/tex]

S = [tex][Ca^{+2}] = [CO_{3}^{-2}] + [HW_{3}^{-}][/tex]

On putting the values, we will get

[tex][Ca^{+2}] = [CO_{3}^{-2}] +(1+ \frac{H^{+} }{K_{2} })[/tex]

S^2 = Ksp (1 + [tex](1+ \frac{H^{+} }{K_{2} })[/tex])

S = [tex]\sqrt{ Ksp (1+ \frac{H^{+} }{K_{2} })}[/tex]

at Ph = 6.3

[H+] = 5.011 x [tex]10^{-7}[/tex]

S = [tex]\sqrt{3.36 * 10^{-9} * (1+\frac{5.011*10^{-11} }{4.8*10^{-11} }) }[/tex]

S = 5.92 x [tex]10^{-3}[/tex]

at Ph = 10.3

[H+] = 5.011 x [tex]10^{-11}[/tex]

S = [tex]\sqrt{3.36 * 10^{-9} * (1+\frac{5.011*10^{-11} }{4.8*10^{-11} }) }[/tex]

S = 8.287 x [tex]10^{-5}[/tex]

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The property of acids which would cause acid rain to damage buildings over time is:

Acids react with limestone.

The correct answer choice is option c.

This simply means that acids has this property which corrodes the surface they come in contact with especially stones.

However, this can be done by coating the surface of metals, or carbonate by coating it with other metals. By so doing, this can prevent acid rain damage to it.

That being said, by default, concentrated acids are highly corrosive.

Coating surfaces of metals can prevent acid rain damage to it

This refers to a substance which when dissolved in water, it produces hydrogen ion as the only positive ion in the solution.

So therefore, the property of acids which would cause acid rain to damage buildings over time is acids react with limestone.

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The scientific observation definition is any sensory revel about a natural phenomenon. medical observations can occur in a lab placing or inside the herbal world. as instance, watching an apple fall from a tree may be a remark. Noticing that fish handiest come to a specific part of the river in the early morning is likewise an observation.

Smelling rubbish decomposing is another example of observation. Observations can use any of the five senses and include anything that can boost a query or begin research. Extraneous variables may become confounding variables and when they are not controlled early enough in a study, they could affect the results of the experimental research.

An end is a statement based totally on experimental measurements and observations. It includes a precis of the consequences, whether or not or now not the speculation turned into support, the importance of the have a look at, and destiny research. The value of a managed test is that it yields an excessive diploma of self-assurance within the outcome.  which variable induced or did no longer purpose an exchange.

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This question probably pertains to an experiment called a double-slit interference experiment or a similar experiment. Let's say that slit 1 is closed and that we conduct the experiment with solitary electrons or photons.

Behind slit 2, we observe an incremental accumulation of hits in a non-interference pattern. Let's say we seal the slit. Behind slit 1, we can see the non-interference pattern. Let's now widen both slits. The impacts then create an interference pattern, as we can see. Note that (assuming it's a nearly flawless experiment with a very distinct interference pattern), there are specific locations termed "nodes" where NO electrons collide. The logical conclusion is that each individual electron "knows" that both slits are open when both are open, meaning that each electron effectively passes through both slits.

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Answer:

No.

Explanation:

Energy is releasing into your body via a process of chemical reactions called respiration. Without respiration, energy cannot be released from food and transfered to cells.

The balanced equation for the reaction in this experiment is 3CuSO4(aq) + 2Al(s) →→→ Al2(SO4)3 + 3Cu(s) In this experiment, you have seen that exactly 1,99 g copper sulphate is reacted aluminium. When the reaction reaches completion, 0,57 g of copper was collected. Determining the limiting reagent 2.1.1 Calculate the number of moles in 1,99g of copper sulphate.

2.1.2 Calculate the number of moles in 0,254g of aluminium.

2.1.3 Determine the limiting reagent in this reaction. Provide some calculations as well as a justification for your answer

3CuSO4(aq) + 2Al(s) → Al2(SO4)3 + 3Cu(s)

as per the reaction , we can see that in this

3 moles of copper sulphate and 2 moles of aluminium required to make 1 moles of aluminium sulphate and 3 moles of copper

so from this we concluded that copper sulphate is limiting reagent because due to high moles needed it will cause to stop reaction

as in reaction 3 moles copper sulphate requires  480g and 2 mole aluminium requires 54g so here CuSO4 is limiting reaction.

2.1.1)   number of moles in 1,99g of copper sulphate.

moles= given mass of substance/ molecular mass of substance

moles= given mass of  copper sulphate/ molecular mass of  copper sulphate

moles =  1,99g/160g

moles=1.24 moles

2.1.2) number of moles in 0,254g of aluminium.

moles= given mass of  aluminium/ molecular mass of aluminium

moles=254g/27

moles=0.40mole

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7380 J/g is the  amount of heat must be added to 75g of ethyl alcohol to heat it from -5c to 35c

What is specific heat capacity?

The quantity of heat energy needed to raise the temperature of a unit mass of any substance or matter by one degree Celsius is known as its specific heat capacity.

The formula is as follows:

Q= m c ΔT

Here, Q is the quantity of heat energy needed to raise the temperature of one kilogram of a substance by one degree Celsius, and s is the system's specific heat capacity.

Here,

m = 75g

c = 2.46J/g °C

ΔT = 40°C

Q = 75*2.46*40 = 7380 J/g

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Using a magnet and the magnetic property of iron—which attracts iron but not sand—one can separate a combination of iron filings and sand.

Physical characteristics are those that may be observed by looking at an item or substance. When the makeup of a substance changes, certain qualities remain constant.

Sand and iron can be separated using an object's magnetic characteristics, which are the ability to attract magnets and/or materials containing iron.

So, one may separate a mixture of iron filings and sand using a magnet and iron's magnetic characteristic, which attracts iron but repels sand.

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Iron filings are attracted by a magnet. This is a physical property of iron but not of most other materials, including sand. How could you use this difference in physical properties to separate a mixture of iron filings and sand?

CH3COOH is a weak acid.

Which pair of substances is capable of forming a buffer in an aqueous solution?

Acidic buffer is formed by weak acid and its conjugate base

A basic buffer is formed by a weak base and its conjugate acid

a)

H3PO4 is a weak acid

But its conjugate base H2PO4- is not present

b)

HNO3 is a strong acid.

It cant form a buffer

c)

HCl is a strong acid.

It cant form a buffer

d)

H2CO3 is a weak acid.

But its conjugate base, HCO3- is not present

E)

CH3COOH is a weak acid.

CH3COONa is its conjugate base. They form the acidic buffer.

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Yes I would verify this equation as a general homogeneous equations.

What is homogeneous equation?

An equation with a differentiation, a function, and a number of variables is called a homogeneous differential equation. For any non-zero constant, the function f(x, y) in a homogeneous differential equation is a homogeneous function such that f(x, y) = nf(x, y).

[tex]Q= 8 μ ℓπ R 4 Δp[/tex] is given.

Put primary FLT dimensions to use.

[tex]L 3 T −1 =( 8π​ ) (FL −2 T) (L)(L) 4 (FL −2[/tex]   Adding and removing each side's exponent.

[tex](L) (3) (T) (−1) =( 8π​ ) (F) (1−1) (L) (4−2+2−1) (T) (−1)[/tex]

[tex](L) 3 (T) −1 =( 8π​ ) (L) 3 (T) −1[/tex]

The right side and left side of the equation are identical.

The equation is consequently a general homogeneous equation.

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Question :

The volume rate of flow, Q, through a pipe containing a slowly moving liquid is given by the equation:

Q=\frac{\pi R^{4} \Delta p}{8 \mu \ell}Q= 8μℓπR 4 Δp

​ where R is the pipe racius, \Delta pΔp the pressure drop along the pipe, \muμ a fluid property called viscosity \left(F L^{-2} T\right)(FL

−2

T), and \ellℓ the length of pipe. What are the dimensions of the constant \pi / 8π/8? Would you classify this equation as a general homogeneous equation? Explain.