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Among the given elements, S and Sr forms ionic compound. Sr metal donate electron to sulfur forming ionic compound.

Ionic compounds are formed between metals and non metals. The metals are electropositive elements. They easily loss electrons in chemical bonding.

Strontium is an alkaline earth metal with two valence electrons. Strontium forms ionic compounds with non-metals by donating its two valence electrons.

Sulfur needs two more electrons to achieve octet. Hence, it easily gain two electrons from strontium metal forming the ionic compound SrS.

Hence, option c is correct.

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Answer:

a chemical change

Explanation:

a physical change is mostly identified even without indicators i.e candle wax about forming a new acid or base I guess we have to include a ph scale to ascertain since the salt can be acidic but not necessarily an acid

Answer: The answer is A, a chemical change has occurred

Explanation:

I’m just a jenious

Answer:

Silver (Ag)

Explanation:

The electronic configuration of copper is shown below;

[Kr]4d10 5s1

We can see that there is only one 5s1 electron. Hence Ag^+ tends to display a pseudo noble gas configuration. This pseudo noble gas configuration explains why silver is prevalent in the +1 oxidation state.

The other transition metals have many stable oxidation states found in nature. Chromium is observed both in +3 and +6 oxidation states. Iron is found in +2 and +3 oxidation states and copper is mostly stable in the +2 oxidation state since the +1 oxidation state readily disproportionate.

Hence silver tends to have only a single ionic charge for reasons aptly stated above.

The partial pressure of carbon dioxide gas in the collected sample is 709 mmHg, and the fraction of the mixture that is CO2 is 0.974 or about 97.4%.

The method used to find the density of carbon dioxide gas is by collecting the gas by displacing water in a bottle.

To find the partial pressure of carbon dioxide gas in the collected sample, we need to subtract the partial pressure of water vapor from the total pressure of the mixture:

Partial pressure of CO2 = Total pressure - Partial pressure of water vapor

Partial pressure of CO2 = 730 mmHg - 21 mmHg

Partial pressure of CO2 = 709 mmHg

To find the fraction of the mixture that is CO2, we need to use the ideal gas law, which states:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.

Assuming that the volume of the sample is constant and that the temperature is constant at room temperature (around 298 K), we can simplify the ideal gas law to:

P = nRT/V

Since the pressure of the mixture is equal to the sum of the partial pressures of the gases, we can write:

P(total) = P(CO2) + P(H2O)

Solving for n/V for carbon dioxide, we get:

n/V(CO2) = P(CO2)/RT

Substituting the values we have

n/V(CO2) = (709 mmHg)/(0.0821 L atm/K mol x 298 K)

n/V(CO2) = 0.0285 mol/L

Now, we need to find the total number of moles in the sample. We can do this by using the ideal gas law again, this time for water vapor:

P(H2O) = n(H2O)RT/V

Solving for n/V(H2O), we get:

n/V(H2O) = P(H2O)/(RT)

Substituting the values we have:

n/V(H2O) = (21 mmHg)/(0.0821 L atm/K mol x 298 K)

n/V(H2O) = 0.00083 mol/L

Since the volume of the sample is constant, the total number of moles is equal to the sum of the number of moles of CO2 and water vapor:

n(total) = n(CO2) + n(H2O)

Substituting the values we have:

n(total) = (0.0285 mol/L)(V) + (0.00083 mol/L)(V)

n(total) = (0.0293 mol/L)(V)

The fraction of the mixture that is CO2 is:

Fraction CO2 = n(CO2)/n(total)

Fraction CO2 = (0.0285 mol/L)(V)/(0.0293 mol/L)(V)

Fraction CO2 = 0.974

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Answer:

Cholesterol is a waxy substance found in your blood. Your body needs cholesterol to build healthy cells, but high levels of cholesterol can increase your risk of heart disease. With high cholesterol, you can develop fatty deposits in your blood vessels.

Explanation:

Answer:

Cholesterol is a waxy substance found in your blood. It can affect our bodies in many ways. If you have high levels of cholesterol it can increase your risk of heart disease. Your body needs it to help build healthy cells.

Explanation:

Hope this helps:)...if not then sorry for wasting your time and may God bless you:)

The volume of the gas is 1.27 L at a temperature is 47°C and the pressure is 5.0 atm. Therefore, option (B) is correct.

The ideal gas equation is described as the equation of the state of a perfect gas. The ideal gas equation is the product of the pressure and volume of one-mole gas is equal to the multiplication of the absolute temperature and gas constant.

The mathematical equation for a perfect gas is as follows:

PV = nRT

where n is the moles of an ideal gas, P is the pressure of the gas,  V is the volume, and R is the universal gas constant.

Given, the initial volume of the gas, V₁ = 2.0 L

The initial temperature of the gas, T₁ =  27° C = 300.15 K

The initial pressure of the gas, P₁ = 3.0 atm

The final temperature of the gas, T₂ =  47° C = 320.15 K

The initial pressure of the gas, P₂ = 5.0 atm

We know that for an ideal gas:

\(\frac{P_1V_1}{T_1} =\frac{P_2V_2}{T_2}\)

\(V_2=\frac{P_1V_1T_2}{T_1P_2}\)

\(V_2= \frac{3.0\times2.0\times320.15}{5.0\times 300.15}\)

\(V_2= 1.27 L\)

Therefore, the volume of the gas in its final state is equal to 1.27 L when the gas is heated to 47ºC and compressed to 5.0 atm.

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Answer:

Explanation:

The reactant with the higher mass in grams is the limiting reactant. NO. [What counts is the numbers of molecules, not their mass.  For example In the reaction of oxygen and hydrogen to form water:

2H2 + O2 = 2H2O

We need twice as many H2 molecules than O2 molecules.  We need two moles of H2 and 1 mole of O2 (or anything with that 2:1 ratio).  But a mole of H2 only has a mass of 2 grams, so 2 moles is 4 grams.  A balanced reaction in thias case would consist of 2 grams of H2 for every 32 grams of O2.  If there were only 31 grams of O2, it would be the limiting reagent, despite the fact it's mass is still greater than that of H2O]

Calculate the amount of product that can be made with each reactant, then choose the reactant that produces the least amount of product.  YES  [Once the reactant is consumed in producing the least amount of product, no more product will be produced, desoppite the fact that the other reactant reamins.]

Calculate the amount of product that can be made with each reactant, then choose the reactant that produces the most amount of product. NO

[This ignores the fact that the reaction stops when the other reactant is depleted.]

The reactant with the lower mass in grams is the limiting reactant.  NO, for the same reasons as in 1).

Answer:

Mountains

Explanation:

Mountains are colder than the lower elevations.  When humid air enters a cooler region, the saturated air begins to cool  and this reduces the ability of the air to maintain the evaporated water is the gas state.  Molecules of water have reduced enerfy at the cooler temperatures.  They will slow down and coalesce with other water molecules to form small droplets of water.  The atmoshere cannot hold these heaevier droplets and they begin to fall  (i.e., rain).

One migh ask why does the air temperature drop at higher altitudes?  Heat rises, so why shouldn't it be warmer on top a mountain, compared to the valley.  The reason is that the atmosphere becomes less dense the further from Earth's center on gets.  This less dense air has a lower water saturation point, so it rains.

The type of light bulb that is usually filled with a mixture of inert gases (such as argon and krypton) and mercury is a fluorescent light bulb.

Fluorescent bulbs contain a glass tube coated with phosphor on the inside. The tube is filled with a mixture of inert gases, primarily argon and krypton, at low pressure. These inert gases help create a stable environment inside the bulb.

When an electric current flows through the tube, it excites the mercury vapor present in the bulb. The excited mercury emits ultraviolet (UV) light, which then interacts with the phosphor coating, causing it to fluoresce and emit visible light. This process produces the characteristic glow of fluorescent bulbs. The inert gases help facilitate the efficient transfer of energy and maintain the stability of the bulb during operation.

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Answer:

a. 53.3°C.

b.  Percent error for both students is 53.3°C

c. Both students are equal in accuracy.

2nd student is most precise

Explanation:

The percent error is defined as:

|M - T| / T * 100

Where M is measurement,

and T is theoretical value

a. To obtain the average of both measurements we need to sum the measurements and divide these in the number of measurements:

51.5°C+53.5°C+55.0°C+52.3°C+54.2°C+52.3°C+53.2°C+54.0°C+53.5°C / 9

= 53.3°C

b. Percent error for 1st student:

51.5°C+53.5°C+55.0°C+52.3°C+54.2°C / 5 = 53.3°C

|53.3°C - 53.0°C| / 53°C * 100

0.57%

Percent error for 2nd student:

52.3°C+53.2°C+54.0°C+53.5°C / 4 = 53.3°C

|53.3°C - 53.0°C| / 53°C * 100

0.57%

c. Now, precision is how close are the measurements to each other and the accuracy how close are the measurements to the theoretical value:

The accuracy is obtained with percent error, the lower percent error the most accurate measurement. That means:

both students are equal in accuracy.

And precision is obtained with relative standard desviation.

Desviation standard / Average * 100

(We can solve the standard desviation in a scientific calculator):

1st student:

2.65%

2nd student:

1.34%

The lower RSD the most precise measurements.

Answer:

answer is B

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Answer:

1.476 mol molecules

Explanation:

The steam power plant operates based on the Rankine cycle, which is a thermodynamic cycle commonly used in power generation. The steam turbine in the power plant receives superheated steam at 395 psi and 572 °F and discharges steam at 2 psi and 250 °F.

To analyze the operation of the steam power plant, we can use the Rankine cycle, which consists of four main components: the boiler, turbine, condenser, and pump.

Boiler: The boiler is where water is heated to generate steam. In this case, the steam enters the turbine as superheated steam at 395 psi and 572 °F. This information provides the initial conditions for the steam.

Turbine: The steam turbine converts the thermal energy of the steam into mechanical work. The steam expands through the turbine, and its pressure and temperature decrease. The given information does not provide specific details about the turbine operation, so further calculations or analysis specific to the turbine are not possible.

Condenser: The condenser is where the exhaust steam from the turbine is condensed back into liquid form. The given information states that the steam is discharged from the turbine at 2 psi and 250 °F. This indicates the conditions at the outlet of the turbine and provides information about the steam exiting the turbine.

Pump: The pump is responsible for supplying high-pressure liquid to the boiler. The specific details about the pump operation are not provided in the given information.

Based on the given information, we know the initial conditions of the steam entering the turbine and the conditions of the steam discharged from the turbine. However, further calculations and analysis specific to the Rankine cycle and the steam power plant operation are not possible without additional information, such as the specific design and parameters of the components (e.g., turbine efficiency, condenser performance, pump characteristics).

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Q.  Consider a steam power plant operated according to the concept of a Rankine cycle is within reach of the process. The steam turbine receives superheated steam at 395 psi and 572 F and discharges steam at 69psi. The turbine has a power generation isentropic efficiency of 85%. The flow rate of steam is 88,176lb/h.

a)  What is the power generated by the steam turbine?

b) Place the heat delivered by the steam turbine in the cascade diagram

c) What is the maximum heating utility requirement after integrating the steam turbine with the process?

d) Draw the GCC for the process and show the heat loads placement.

The Meaning :-

1. Rearing Is The Process Of Keeping, Feeding, Breeding, And Medical Care Of Useful Animals.

2. Shearing Is The Process Of Removing The Fleece Of Sheep, Along With A Layer Of Skin By A Large Razor, Clipper Or A Shearing Machine.

3. Sericulture Is The Rearing Of Silkworms On A Commercial Scale.

Cyclic bromonium ion is the reactive intermediate that is formed in the reaction of an alkene with br2 and water. the correct answer is option(d).

A reactive intermediate is a highly reactive, high-energy, brief-lived molecule that, when produced in a chemical reaction, will swiftly transform into a stable molecule. They may occasionally be divided and stored. For instance, low temperatures and Matrix Isolation. Carbocations, carbanions, free radicals, carbenes, nitrenes, and benzyne are six different categories of reaction intermediates. These intermediaries are frequently produced when a chemical substance is chemically broken down.

Reactive intermediates can be used to explain the process of a chemical reaction. Reactive intermediates are high-energy, stable products that are present only in one of the intermediate phases of most chemical reactions, which typically involve more than one elementary step.

The complete question is:

What type of reactive intermediate is formed in the reaction of an alkene with Br2 and water to give a bromohydrin?

a.carbocation

b.carbanion

c.radical

d.cyclic bromonium ion

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Dehydrogenation reactions except for succinyl-CoA.isocitratesuccinyl-CoAα-ketoglutaratemalatesuccinyl-CoA.

By using co-enzymes like NAD+, pyruvate dehydrogenase converts pyruvate to acetyl CoA during the process of oxidative pyruvate decarboxylation.This method does not use ATP.

The Krebs cycle enzyme alpha-ketoglutarate dehydrogenase (-KGDH) catalyzes the non-equilibrium reaction that changes alpha-ketoglutarate, coenzyme A, and NAD+ into succinyl-CoA, NADH, and carbon dioxide, and it needs thiamine pyrophosphate as just a cofactor.

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Answer:

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \\ \)

From the question we have

\(density = \frac{38.6}{2} \\ \)

We have the final answer as

Hope this helps you

Answer:

0,11,7,8

Explanation: hope this helps!

Taking into account the reaction stoichiometry, 0.2066 grams of CO₂ are formed from 0.500 grams of iron oxide and an excess of carbon.

In first place, the balanced reaction is:

2 Fe₂O₃ + 3 C → 4 Fe + 3 CO₂

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: if by reaction stoichiometry 319.4 grams of Fe₂O₃ form 132 grams of CO₂, 0.500 grams of Fe₂O₃ form how much mass of CO₂?

\(mass of CO_{2} =\frac{0.500 grams of Fe_{2}O_{3}x132 grams of CO_{2} }{319.4 grams of Fe_{2}O_{3}}\)

mass of CO₂= 0.2066 grams

Then, 0.2066 grams of CO₂ are formed from 0.500 grams of iron oxide and an excess of carbon.

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Answer: 89.0 nanometers

Explanation:  0.000000089 is 8.9x10^-8 m.  I don't think there is a metric prefix for 10^-8.  The term for 10^-9 is nano-  .  If we rewrite 8.9x10^-8 m as 89.ox10^-9 m,, it would be 89.0 nanometers.

The units would be best suited for a measurement of 0.000000089 meters is nanometers.

There are many units used to measure length or distance of substance are given below as.

Picometer = 10∧-12 meters

Nanometer = 10∧-9 meters

micrometer = 10∧-6 meters

milimeter = 10∧-3 meters

centimeter = 10∧-2 meters

decimeter = 10∧-1 meters

decameter = 10 meters

Kilometer = 10∧3 meters

Calculation,

0.000000089 meters = 89/10∧9 = 89 × 10∧-9 = 89 nanometers.

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Answer:

In one shot of expresso, there are:

4.12 x 10^-3 moles of C atoms

5.15 x 10^-3 moles of H atoms

2.06 x 10^-3 moles of N atoms

1.03 x 10^-3 moles of O atoms

The moles of carbon and hydrogen present in the caffeine in one shot of espresso are 4.11×  10⁻³moles and 5.14×  10⁻³moles respectively.

A mole is just a measuring scale. In reality, it is one of the International System for Units' seven foundation units (SI). When already-existing units are insufficient, new ones are created. The levels at which chemical reactions frequently occur exclude the use of grams, yet utilizing actual numbers of atoms, molecules, or ions would also be unclear.

6.02 x 1023 chemistry instructors make up a mole. Anytime we want to make a reference to a lot of different things, it is much simpler to type the word "mole" rather than the number "6.02x1023." In essence, it is the reason this specific unit was created.

caffeine in a shot of espresso = 1.00 × 10² mg/1000=0.1g

mole of caffeine =0.1g÷ 194.19g/mol

                           =5.149× 10⁻⁴mole

moles of carbon =8×5.149× 10⁻⁴

                           = 4.11×  10⁻³moles

moles of carbon = 10× 5.149× 10⁻⁴

                           =5.14×  10⁻³moles

Therefore, the moles of carbon and hydrogen present in the caffeine in one shot of espresso are 4.11×  10⁻³moles and 5.14×  10⁻³moles respectively.

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Answer:

The HAVING clause is used to restrict the groups that will be included in a query result.

Explanation:

The HAVING clause is used in SQL to filter groups based on aggregate functions. It is typically used in conjunction with the GROUP BY clause, which is used to group rows in a table based on one or more columns. The HAVING clause allows you to further filter the groups based on a condition that is evaluated using aggregate functions such as COUNT, SUM, AVG, etc.

The HAVING clause is executed after the GROUP BY clause and before the SELECT clause. It allows you to filter groups based on aggregate functions, and is used in combination with GROUP BY to filter out groups that do not meet certain criteria, or when you want to compare the values of different aggregate functions within the same query.

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The names of ionic compounds and molecular compounds differ is ionic compound naming at end depend upon the ion. covalent compounds name depends on subscript of individual element.

Ionic compound are form by the ionic bonds , ionic bonds involved the cations and anions.  electrons are take by the more electronegative element , means the complete transfer of electron form ionic compound.

example : NaCl , sodium chloride = ending of second ion as ide

Covalent compounds are form by the sharing of electrons between the atoms. Example : H₂O , water or chemical name is Dihydrogen monoxide.

Thus, The names of ionic compounds and molecular compounds differ is ionic compound naming at end depend upon the ion. covalent compounds name depends on subscript of individual element.

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One student found that 25.0cm³of sodium hydroxide solution was neutralized by exactly 22.30cm³ of 0.100mol/dm³sulfuric acid solution then number of moles of sulfuric acid that this student used in the titration is 4.39 mole

Titration is the process in which determining the quantity of substances by adding increment of another substances and sulfuric acid is the highly acidic therefore it is used to cleaning metals and removal of impurities from oil and it is called king of chemicals because of its direct and indirect applications in manufacture of many chemicals including fertilizers

Here given data is

Sodium hydroxide solution = 25.0cm³

Sulfuric acid solution = 22.30cm³ of 0.100mol/dm³

We have to find  number of moles of sulfuric acid that this student used in the titration =?

Number of moles = mass of substances/mass of one mole

Number of moles = 98.079 g/mol/22.30cm³

Number of moles = 4.39 mole

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The central atom in but-2-ene is carbon (C). Hybridization refers to the mixing of atomic orbitals in an atom to form a new set of hybrid orbitals used in bonding. Here are the steps to determine the hybridization of the central atom in but-2-ene:1. the hybridization of the carbon atom is sp2.

Count the number of valence electrons of all atoms in the molecule.  Carbon has 4 valence electrons while hydrogen has 1 valence electron.2. Determine the total number of valence electrons. In but-2-ene, there are four valence electrons from the carbon atom and four from the two hydrogen atoms.

So, the total valence electrons are 6.3. Draw the Lewis structure of but-2-ene:  Image credit: chem.libretexts.org4. Identify the central atom in the Lewis structure. In but-2-ene, carbon is the central atom.5. Determine the number of sigma bonds around the carbon atom. In but-2-ene, there are three sigma bonds around the carbon atom.6. Determine the number of lone pairs on the carbon atom. In but-2-ene, there are no lone pairs on the carbon atom.7. Use the following formula to determine the hybridization of the carbon atom: Hybridization = (number of sigma bonds + number of lone pairs)The carbon atom in but-2-ene has three sigma bonds and no lone pairs. Therefore, the hybridization of the carbon atom is sp2.

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