Choose the isotope in each pair that can be used in radiometric dating. Then, explain how you made your selection. (Hint: you'll need a version of the periodic table of elements that includes each element's atomic weight.)
Potassium-41, Potassium-39

Chlorine-35, Chlorine-36

Iodine-129, Iodine-127

The minimum mass of octane that could be left over is 0.468 grams.

Step 1: Data given

Mass of octane = 3.4 grams

Mass of oxygen = 20.5 grams

Molar mass octane = 114.23 g/mol

Molar mass oxygen = 32.0 g/mol

Step 2: The balanced equation

2C₈H₁₈ + 25O₂ → 16CO₂ + 18H₂O

Step 3: Calculate the number of moles

Moles = mass / molar mass

Moles octane = 3.4 grams / 114.23 g/mol

Moles octane = 0.0297 moles

Moles O₂ = 20.5 grams / 32.0 g/mol

Moles O₂ = 0.640 moles

Step 4: Calculate the limiting reactant

For 2 moles octane we need 25 moles O₂ to produce 16 moles CO₂ and 18 moles H₂O

O₂ is the limiting reactant. It will completely be consumed (0.640 moles). There will react 0.0320/ 12.5 = 0.0256 moles.

There will remain 0.0297 - 0.0256  = 0.0041 moles octane.

Step 5: Calculate mass octane remaining

Mass octane = moles * molar mass

Mass octane = 0.0041 moles * 114.23 g/mol

Mass octane = 0.468 grams

The minimum mass of octane that could be left over is 0.468 grams.

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The heat of reaction is  1.8 KJ. A calorimeter is a device used in calorimetry, a procedure for calculating heat capacity and measuring the heat of chemical processes or other physical changes.

Volume of water = 67.9 mL

Since the density of water is 1.00 g/mL

Density = mass/volume

Mass of water = Density × volume

Mass of water =  1 g/mL × 67.9 mL

Mass of water = 67.9g or 0.0679 Kg

Temperature change =  6.5 oC

Specific heat capacity of water= 4.184 J/Kg

From;

H = mcθ

m = mass of water

c = heat capacity of water

θ = temperature rise

Substituting values;

H = 0.0679 Kg × 4.184 J/Kg × 6.5 oC

H = 1.8 KJ

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Answer:

Its 1s22s22p63s23p1 ik it looks a lil goofy but i think its right

Explanation:

The Conduction and Convection Gizmo shows two flasks of colored water, one blue and one yellow. Select Copper and Solid chunk from the dropdown lists his means the two flasks are separated by a solid piece of copper, and the two liquids cannot touch each other then temprature tries to become the even/leveled

Conduction is the process to transfer heat from one substances to another by direct contact and convention means a rise and sink due to temprature and density differences this is called convention and when  two flasks are separated by a solid piece of copper, and the two liquids cannot touch each other then to use the sliders to make one flask hotter than other and the temprature tries to become the even/leveled

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Answer:

I don't know why 27.6 g is not the correct answer.  I believe that it is correct.

27.6 grams of [tex]H_{2}[/tex].

Explanation:

The balanced equation tells us that 17 moles of hydrogen will react completely with 8 moles of carbon monoxide.  That is a molar ratio of 17/8 moles H2/molesCO.

If we start with 6.5 moles of CO, we need:

(6.5 moles CO)*(17/8 moles H2/moles CO) = 13.8 moles of H2 (3 sig figs)

Convert 13.8 moles of H2 into grams H2 by multiplying by the molar mass iof H2 (2g/mole):

(13.8 moles H2)*(2 g H2/mole H2) = 27.6 grams of [tex]H_{2}[/tex].

The student used an acid-base extraction method to isolate three compounds. In this lab, students will use solvents of different polarity (mobile phases) to determine the optimal separation of the pigments found in spinach extracts.

Mixtures are physical mixtures or additional materials that retain their inherent properties and come together in the form of a reaction, suspension, or colloid. Combinations are materials made from materials or other uniquely styled materials. It can be separated using physical methods. Examples include solutions of salt and water, mixtures of sugar and water, various gases, and air.

The mixture consists of one or more pure materials with different compositions. There are heterogeneous and homogeneous types of mixtures. Dissimilar combinations have visually distinguishable additives, while homogeneous combinations appear uniform throughout. Agglomerates are created by the mixing of two or more distinct substances in the body and can be separated from below into their original substances. A chemical reaction occurs when additional substances combine to form a completely new substance and cannot be separated back into the original substance.

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The concentration of the dilute solution is 0.3592 M.

Concentration, or the amount of solute in a solution, can either be expressed in molarity, M, moles of solute per liter of solution, or molality, m, moles of solute per kilogram of solution.

If the concentrated nitric acid solution is 12.0 M, then there are 12.0 moles nitric acid per liter of solution.

For a 4.49 ml of a concentrated 12.0 M nitric acid solution, the number of moles is 0.05388.

M = moles of solute / volume of solution

moles = 12.0 M(4.49 ml)(1 L / 1000 ml)

moles = 0.05388 moles nitric acid

If the total volume is 150 ml, then the concentration of the diluted solution is

M = moles of solute / volume of solution

M = 0.05388 moles nitric acid / 150 mL (1 L / 1000 ml)

M = 0.3592

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Answer:

COCl2 Phosgene

Explanation:

When a mycelium infiltrates an unexploited source of dead organic matter, Fungal digestive enzymes are most likely to appear within the food source soon thereafter.

A network of hyphae with fungal filaments is called mycelium. Although they can thrive in various habitats, such as rotting tree trunks, mycelia frequently grow underground. Mycelium can be produced by a single spore. Many fungi, including mushrooms, grow their fruiting bodies from mycelium. Mycelia are crucial to the health of the soil. They decompose organic matter, returning essential elements to the ecosystem as a result.

Fungal enzymes are active in an acidic environment that mimics the physiology of the human stomach. In vitro, fungi enzymes enhance the digestion of dietary fat, protein, and carbohydrates. The research of digestive deterioration with aging has been established using an adapted in vitro technique.

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The release of O₂( oxygen) from the process of photosynthesis is what made them to be able to float.

This is referred to as the process in which green plants manufacture their food in the presence of sunlight which is trapped by chlorophyll.They are known as primary producers and they use compounds such as water and carbondioxide.

The reactants mentioned above undergo series of reactions which leads to the production of glucose and oxygen is given off as a result which is the element responsible for the floating of the aspirated spinach leaf disks in this scenario.

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The concentration on diluting the solution by student is 1 M.

The concentration and volume are related to each other as - [tex] M_{1}[/tex] [tex] V_{1}[/tex] = [tex] M_{2}[/tex] [tex] V_{2}[/tex], where [tex] M_{1}[/tex] and [tex] M_{2}[/tex] are initial and final molarity and [tex] V_{1}[/tex] and [tex] V_{2}[/tex] are initial and final volume.

[tex] M_{1}[/tex] is 10.1 M, [tex] V_{1}[/tex] is 12.4 milliliters, [tex] M_{2}[/tex] is to be calculated and [tex] V_{2}[/tex] is 125 milliliters.

Keep the values in formula to find the value of [tex] M_{2}[/tex].

10.1×12.4 = [tex] M_{2}[/tex]×125

[tex] M_{2}[/tex] = 125.24 ÷ 125

Performing division on Right Hand Side of the equation

[tex] M_{2}[/tex] = 1.00192 M or 1 M.

Thus, the concentration of diluted solution is 1 M.

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a.) 5.34102 Zn(cu)2 molecules are formed.

b.) The mass of Zn(cu)2 formed is 10.41 g at 117.44 g/mol

The entire numbers next to each component of the reaction should be noted because they will be necessary for the stoichiometric calculations that follow:

K[ag(CN)2] has a molar mass of 199 g/mol.

Zn(Cn)2 has a molar mass of 117.44 g/mol.

6.022 x 1023 molecules per mole is Avogadro's number.

a.)

35.27 g* (199 g/1 mol) x (1 mol Zn(Cn)2/ 2 mol K[Ag(CN)2]) x

(6.0221023 molecules/mol) = 5.341022 Zn(Cn)2 molecules.

b.)

35.27 g x (199 g/1 mol) x (1 mol Zn(Cn)2/ 2 mol K[Ag(CN)2]) x

Zn(Cn)2 equals 10.41 g at (117.44 g/mol).

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From ores like k[ag(CN)2], silver is frequently removed before being recovered by reaction and 5.34102 Zn(Cu)2 molecules are formed and the masses of Zn(Cu)2 formed is 10.41 g at 117.44 g/mol.

It is important to take notice of the whole numbers next to each reaction component because the following stoichiometric calculations will require them:

The molar mass of K[ag(CN)2] is 199 g/mol.

The molar mass of Zn(Cn)2 is 117.44 g/mol

Avogadro's number is 6.022 x 1023 molecules per mole.

a.) 35.27 g* (1 mol Zn(Cn)2/ 2 mol K[Ag(CN)2]) x (199 g/1 mol) x

5.341022 Zn(Cn)2 molecules =

6.0221023 molecules/mol.

b.) 35.27 g x (1 mol Zn(Cn)2/ 2 mol K[Ag(CN)2]) x (199 g/1 mol) x

10.41 g of Zn(Cn)2 are,

= 117.44 g/mol.

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Density of water is 1g/cc whereas ethanol is 0.79g/cc

So density of ethanol is less than water hence ethanol will float on water

What is density ?

density is the mass of a material substance per unit volume. d = M/V, where d is density, M is mass, and V is volume, is the formula for density. Grams per cubic centimeter are a typical unit of measurement for density. For instance, while Earth has a density of 5.51 grammes per cubic centimeter, water has a density of 1 grammes per cubic centimeter. Another way to state density is in kilograms per cubic meter (in meter-kilogram-second or SI units)

Density of water is 1g/cc whereas ethanol is 0.79g/cc

So density of ethanol is less than water hence ethanol will float on water

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The final volume of the ideal gas in a flexible container will be 9.0 L.

Let:

Ideal-gas Equation establishes a relation between pressures, volumes, and temperatures of different conditions.

Using the Ideal-Gas Equation:

                              PV = nRT

Ideal-Gas Equation for initial conditions will be:

                              PV = nRT.....................................................(i)

Ideal-Gas Equation for final conditions will be:

                              (P/3)X = nR(T/2)........................................(ii)

On dividing equations (i) and (ii):

                             PV = nRT / (P/3)X = nR(T/2)

                             3V/X = 2

                             X = 3V/2

Putting the value of V = 6L:

                             X = 3(6L)/2 = 9L

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Flammable liquids and solids, such as lighter refills, lighter fuel, matches, paints, thinners, fire-lighters, lighters that must be inverted before ignition, matches (these may be carried on the person), radioactive material, briefcases, and attach cases with alarm devices installed.

Food items larger than 3.4 oz are not permitted in carry-on bags and should be stored in checked bags if possible. Food, powders, and other materials that can clog bags and obstruct clear images on the X-ray machine may be instructed to be separated from carry-on bags by TSA officers. Most passengers are permitted to bring one full-size carry-on bag and one personal item for free on their flight. There are some exceptions, such as customers traveling on Basic Economy tickets.

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Answer:

Explanation:

Boyle's law was used when a traveller on a plane packed a bag of potato chips in his checked luggage and put it in the unventilated baggage hold. When the passenger opened the bag after landing, the bag exploded, and there were chips all over his luggage.

Why is Boyle’s law applicable to the airplane passenger?

Let's have a look at the link between pressure and height to better understand how the answer was arrived at.

Altitude increases cause a drop in pressure.

A particular surface has fewer air molecules above it at higher elevations than it does at lower elevations.

This indicates that the pressure is high at ground level and low at the airspace through which an airplane passes.

The gas in the sealed bag of potato chips had expanded, causing the bag to explode.

Given that it demonstrates the relationship between volume and pressure, this circumstance serves as an illustration of Boyle's law.

Basically, Boyle's law states that when pressure lowers, volume rises and vice versa.

What does Boyle’s law state?

If the temperature and amount of gas remain constant in a closed system, the absolute pressure exerted by a given mass of an ideal gas is inversely proportional to the volume it occupies.

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The N=(tR/σ)2 the number of theoretical plates, the distillation the separation of a mixture of two liquids.

The effectiveness of a column is frequently determined using the number of theoretical plates. The range of plate numbers is 100 to 106. The quality of the separation improves with the number of theoretical plates present in a column because more equilibrations between the stationary and mobile phases are possible.

The effectiveness of a column's column is closely tied to theoretical plates in column chromatography. It can therefore help to increase resolution, which, when all other factors are held constant, is directly proportional to the square root of the number of theoretical plates.

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Factors influence bond lengths are smaller atoms have shorter bond lengths. double bonds are shorter and stronger than single bonds.

Bond order, or the number of chemical bonds between a pair of atoms, is a measure of a bond's stability. For instance, the bond order in diatomic nitrogen, NN, is 3, while in acetylene, HCCH, the carbon-carbon bond order is also 3, while the CH bond order is 1. Bond type and bond strength are determined by bond order and length between atoms. The relationship between bond order and length is inverse: as bond order rises, bond length falls.

When two atoms come together to form a molecule, their electrons join forces by fusing into gaps in one another's orbital shells.

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Answer: I think it’s C

Explanation:

I think it’s C because animal cells do not have a cell wall and the cell wall is unique to plant cells

1. The longer distance for each choice is:

2. The complete statements are as follows;

3. The basic unit of length in the metric system is the meter and is represented by a lowercase m.

4. The meter is defined as the distance traveled by light in absolute vacuum in 1⁄299,792,458 of a second.

5. The values that complete each statement is given below:

6. The larger value for each option is:

7. The number of millimeters in 1 centimeter is 10 mm

8. Using the ruler and line, the answers are:

The unit for measuring distance in the metric system is the meter. Smaller and larger values of the meter are also used such as millimeters, centimeters, kilometers, etc.

Other units for measuring distance include yards, miles, and inches.

The various units for measuring distance can also be interconverted using their conversion factors.

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The mass of soap formed to satisfy the law of conservation of mass is 918g.

According to the rule of conservation of mass, in a chemical process, mass neither creates nor destroys itself. When coal is burned, for instance, the carbon atom in it transforms into carbon dioxide. Although the carbon atom's shape changes from solid to gas, its mass remains constant.

The mass of the reactants and products in a chemical reaction must equal each other according to the law of conservation of mass.

Fat + sodium hydroxide  = soap + glycerin

890+ 120  = soap  + 92

1010 = soap + 92

soap = 1010 - 92

soap = 918g.

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The mass number of an atom that has 53 protons, 78 neutrons, and 54 electrons would be 131.

A mass number can be described as the sum total of the number of protons and neutrons that are contained within the nucleus of an atom.

If we want to calculate the mass number of an atom, we need to add the number of neutrons present inside the atoms with the number of protons present inside the atom.

As mentioned in the question, the number of protons inside the said atom is 53 whereas the number of neutrons is 78. Hence,

53+78= 131

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The factor that will increase the rate of the function of the enzyme A is increasing the temperature to 70°C (option A).

Enzymes are biological catalysts meaning that they regulate the rate of biochemical reactions in living cells.

Enzymes lower the activation energy of a reaction, which is the required amount of energy needed for a reaction to occur. Enzymes do this by binding to a substrate and holding it in a way that allows the reaction to happen more efficiently.

The factors that affect the rate of function of na enzyme are as follows:

Each enzyme has an optimum pH range. This means that changing the pH outside of this range will slow enzyme activity, however, raising temperature generally speeds up a reaction, and lowering temperature slows down a reaction.

Therefore, the increase of temperature will increase the rate of function of the enzyme A.

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The dimensions of the twelve smaller portions of the rectangular piece of fabric will be:

The dimensions of the twelve smaller portions of the rectangular piece of fabric will be determined below as follows:

Dimension of the original piece of fabric is given as;

length = 1.20 meters and

width = 0.85 meters

The number of divisions of the fabric will be 12 equal parts

The multiples of 12 are 1, 2, 3, 4, 6, 12

Using the multiples to determine the  dimensions of the twelve smaller portions:

12 and 1

Length = 1.2 / 12 = 0.1 m

width = 0.85 / 1 = 0.85 m

6 and 2

Length = 1.2 / 6 = 0.2 m

width = 0.85 / 2 = 0.425 m

4 and 3

Length = 1.2 / 4 = 0.3 m

width = 0.85 / 3 = 0.283 m

Therefore, the multiples 12 and 1 are the best match.

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Once chewed and swallowed, the food will be digested and absorbed nutrients, while the rest of the food will be excreted through the body's feces. This digestion process can take about 24-72 hours.

The process of digestion of food in humans can be divided into two types, namely mechanical digestion and chemical (enzymatic) digestion. Mechanical digestion is the process of changing food from a large or coarse form to a smaller or finer form. The process takes place in the mouth with the help of teeth and tongue. The mechanical digestion process also occurs in the stomach with the help of peristaltic motion of the stomach wall, so that food is like being stirred. While the chemical digestion process is the process of converting food substances from complex forms into simpler forms with the help of digestive enzymes.

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10 N

Buoyant force is equal to the weight of the displaced fluid; acting in the upward direction.

Answer:We know that when a body is fully or partially submerged in a fluid,its weight is decreased and that amount of decrease is equals to the weight of the fluid displaced by it.

So,this apparent reduction of weight is due to the buoyancy force acting,which is equals to the weight of the fluid displaced by the body.

So,here the buoyancy force acting on the object is

10

N

Explanation:

Answer:

Explanation:

In which step of the four-stroke engine cycle does the car release CO₂, H₂O, and CO?

O C. Exhaust

        A chemical reaction's rate and the concentrations of the reactants involved are correlated by an expression known as the rate law, commonly referred to as the rate equation.

       The rate equation's "orders," the exponents a and b, must be established empirically. The exponents are added to determine the reaction's overall order. In other words, the reaction is third order overall if a=1 and b=2.

       By adding together the different orders, the reaction's overall order can be determined. For instance, the overall order is 2 if the reaction is first order with regard to both A and B (a = 1 and b = 1). This is referred to as a global second order response.

Finding a Rate Law's Exponents from Initial Rates (Experimental Data)

          The molar concentrations of the reactants are used by the rate law to calculate the reaction rate. Because there are more molecules colliding and reacting with one another, reactions often proceed more quickly at higher reactant concentrations.

       The exponents of a rate law's concentration terms are added to determine its order. The rate law of a reaction can be utilized to better understand the makeup of the reaction mixture once it has been established.

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Method: Filtration

Sodium chloride is your everyday common table salt! So it's just separating salt fro. Water!

Procedure: The mixture of salt and sand can be separated by filtration followed by an evaporation process. Filtration can separate sand from a combination of sand and salt solution (salt dissolved in water). Sand stays on the filter paper as a residue after filtering. By boiling the filtrate, common salt may now be produced. Boiling causes all of the water to evaporate, leaving just salt remaining. This is known as evaporation. Thus, this is how salt and sand are separated.

Answer: This may seem unlikely for whereever you're living but say if a drought happened in your country and water is very limited, then we'd have to import water from other countries but if their water is unclean then we also have a problem of no water. Most bottled water sold in stores comes from other countries aswell.