Identify the steps you would take to determine the percent by mass of water that makes up a sample of hydrated copper (II) sulfate (CuSO, 5H20).​

Answer:

90 Thymine bases

Explanation:

Chargaff's rules states that in the DNA of any organism, the amount of purine and pyrimidine bases must be in a 1:1 ratio. This means that the amount of Adenine and Guanine bases (purines) should be equal with their complementary pairs of Thymine and Cytosine bases respectively (pyrimidines). (A = T) + (G = C) = 100

Hence, according to this question, if there are 60 cytosine bases, this means that there will be 60 Guanine bases. 60 C + 60 G = 120 pyrimidines

300 total bases - 120 pyrimidine bases = 180 purine bases.

180/2 = 90 equal bases of Adenine and Thymine. Hence, Thymine bases will be 90.

Answer: c

Explanation:

An unexpected color change is not a sign that a chemical change has occur. Thus option c is correct.

A chemical change is defined as the transformation of one material into another, the formation of new materials with different properties, and the formation of one or more new substances.

There are basically five types of chemical reaction.

Thus, an unexpected color change is not a sign that a chemical change has occur. Thus option c is correct.

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The average speed is approximately 19.0 kilometers per hour.

When we say the average speed is approximately 19.0 kilometers per hour, it means that over a given time period, the object or person in question traveled a total distance of 19.0 kilometers divided by the total time it took to cover that distance. In this case, the given speed is 19 kilometers per hour.

To calculate the average speed, we use the formula:

Average Speed = Total Distance / Total Time

In the given question, the speed is already mentioned as 19 kilometers per hour. So, we can conclude that the total distance covered is 19 kilometers.

However, to find the total time taken, we need more information. The question only provides the speed but not the duration of the journey. Without knowing the total time, we cannot determine the average speed accurately. Therefore, in the absence of further information about the time, we can only state that the average speed is approximately 19.0 kilometers per hour based on the given speed.

Average speed and how it is calculated by considering the total distance and total time traveled.

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Answer: The answer is D,

The result table indicate that A. The solute is a SOLID because it has a DECREASE in the amount dissolved as temperature decreases.

The solubility of a solid solute in a liquid solvent generally decreases as the temperature decreases. This is because the kinetic energy of the solute molecules decreases as the temperature decreases. As the kinetic energy of the solute molecules decreases, they are less likely to have enough energy to escape from the solution and enter the gas phase.

In the table, as the temperature decreases, the concentration of the solute in the solution decreases. This indicates that the solute is a solid and that the solubility of the solute decreases as the temperature decreases.

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Answer:

Es so es na formula pero te balto la convinasiones de la formula

Taking into account the reaction stoichiometry, P₄ will be the limiting reagent.

In first place, the balanced reaction is:

8 P₄ + 3 S₈ → 8 P₄S₃

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 limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.

To determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 3 moles of S₈ reacts with 8 moles of P₄, 4 moles of S₈ reacts with how many moles of P₄?

\(moles of P_{4} =\frac{4 moles of S_{8} x8 moles of P_{4} }{3 moles of S_{8}}\)

moles of P₄= 10.667 moles

But 10.667 moles of P₄ are not available, 4 moles are available. Since you have less amount of moles than you need to react with 4 moles of S₈, P₄ will be the limiting reagent.

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Answer:

0.5 N

Explanation:

The ball pushes back with the same force as Alice applies to it

Answer:

0.5 Newtons

Explanation:

did it on edge and got it right

Answer:

35.453g/mol is the average atomic mass of the element

Explanation:

The average atomic mass of an element is defined as the sum of the mass of its isotopes multiplied by its natural abundance.

The element of the problem has 2 isotopes:

The first with a mass of 34.969g/mol and its abundance is 75.77%

The second has a mass of 36.966g/mol and its abundance is 24.23%

Its natural abundance is:

34.969g/mol * 75.77% + 36.966g/mol * 24.23%

The loss of the sixth e- will be followed by the biggest ionization jump. Because you are now attempting to remove the 2s2 electrons from a full valence shell, the 7th IE has the largest number.

The amount of energy needed to remove an electron from an isolated atom or molecule is known as ionization energy, also known as ionization potential, in chemistry and physics. The first (most loosely held) electron's associated ionization energy is the one that is most frequently used, though there is an ionization energy for each subsequent electron removed.

An electric discharge tube is typically used to measure the ionization  energy of chemical elements, which is expressed in joules or electron volts. In this device, a fast-moving electron produced by an electric current collides with an element's gaseous atom, causing it to eject one of its electrons.

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The IUPAC name  of the oxyacid formed from chlorite is chlorous acid.

All oxyacids have the acidic hydrogen bound to an oxygen atom, so bond strength (length) is not a factor, as it is with binary nonmetal hydrides. Rather, the electronegativity of the central atom and the number of oxygen atoms determine oxyacid acidity. For oxyacids with the same central atom, acid strength increases with the number of oxygen atoms attached to it. With the same number of oxygen atoms attached to it, acid strength increases with increasing electronegativity of the central atom.

Compared to the salts of their deprotonated forms (a class of compounds known as the oxyanions), oxyacids are generally less stable, and many of them only exist formally as hypothetical species, or only exist in solution and cannot be isolated in pure form.

Thus, the IUPAC name  of the oxyacid formed from chlorite is chlorous acid.

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Answer:

are a result of hydrogen bonding.

Explanation:

The surface tension is the amount of energy required to stretch or increase the surface of a liquid by a unit area. Liquids that have strong intermolecular forces also have high surface tensions. Thus, because of hydrogen bonding, water has a considerably greater surface tension than most other liquids.

Another example of surface tension is capillary action. A thin film of water adheres to the wall of the glass tube. The surface tension of water causes this film to contract, and as it does, it pulls the water up the tube. Two types of forces bring about capillary action.

One is cohesion, which is the intermolecular attraction between like molecules (in this case, the water molecules). The second force, called adhesion, is an attraction between unlike molecules, such as those in water and in the sides of a glass tube. If adhesion is stronger than cohesion, the contents of the tube will be pulled upward. This process continues until the adhesive force is balanced by the weight of the water in the tube.

This characteristics of water are a consequence of a particularly strong type of intermolecular attraction, called the hydrogen bond, which is a special type of dipole-dipole interaction between the hydrogen atom in a polar bond, such as N-H, O-H, or F-H, and an electronegative O, N, or F atom.

Answer:element x

Explanation:because element x is shiny and hard and that's a property of metals and metals are good conductors of heat and electricity

Explanation:

bro this question looks like Astrophysics

By using the universal gravitational law, the gravitational force between the lander and the planet is 688.4 × 10³ N. The acceleration due to gravity of the lander is 6.25 m/s² . The slight changes in gravity may be due to the change with different latitudes of the planet.

Gravitational force is the force by which an object attracts other objects into its center of mass. According to universal gravitational law, the gravitational force can be calculated for two masses m1 and m2 at a distance of r with gravitational constant G as follows:

g = G m1m2/r²

Apply the given values of mass and orbital radius to the equation as follows:

g = (6.647 × 10⁻¹¹ N m² Kg⁻²) (1.1 × 10⁵ Kg × 7.6×10²⁴ Kg ) / (9 × 10⁶ m)²

  =  688.4 × 10³ N.

The acceleration due to gravity of the lander = force /mass

                                                                           =   688.4 × 10³ N /1.1 × 10⁵Kg

                                                                           = 6.25 m/s²

The actual force of gravity may change from the may slightly change from the calculated value because different latitudes will experience different gravity.

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We can use the formula for Boyle's Law to solve this problem, which states that the product of the pressure and volume of a gas is constant when the temperature is held constant:

P1V1 = P2V2

where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume.

Plugging in the given values, we get:

P1 = 142 kPa

V1 = 0.86 L

V2 = 0.11 L

Solving for P2, we get:

P2 = (P1V1)/V2

= (142 kPa x 0.86 L)/0.11 L

= 1103.27 kPa

Therefore, the pressure of the gas will be 1103.27 kPa when compressed to a volume of 0.11 L at a constant temperature of 25°C.

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Answer and Explanation for the First Question:

For the first question, when a 3.0 M aqueous NaOH solution is added to a neutral solution containing litmus, the color change in the solution would be from purple to blue. Thus, the answer would be C.

Litmus exists in solution in equilibrium form as H-Lit(aq) (red) ⇌ H⁺(aq) + Lit⁻(aq) (blue). At around pH 7, or neutral, the solution contains an equal amount of both forms of litmus, resulting in a purple color. This is because there are always some H⁺ ions present in the solution, even in neutral solutions, and the red and blue forms of litmus are present in equal amounts, which make the solution purple.

When a strong base like NaOH is added to the litmus solution, the OH⁻ ions from NaOH fully dissociate and react with the H⁺ ions in the litmus solution, forming water. This reaction causes the equilibrium position to shift in the direction of replacing the lost H⁺ ions. As more H-Lit(aq) molecules dissociate to form H⁺(aq) and Lit⁻(aq), the litmus becomes more ionized.

Since ionized litmus in solution is blue, the color of the solution will change from a neutral purple to a basic blue.

Answer and Explanation for the Second Question:

For the second question, according to the information given, the most likely pH of the solution is 6.0. Thus, the answer would be B.

The pH of the solution can be determined by looking at the color change of the three indicators added. Bromocresol green is yellow at the acidic end of its range, blue at the basic end of its range, and its pH range is 3.8 to 5.4. Chlorophenol red is yellow at the acidic end of its range, red at the basic end of its range, and its pH range is 5.2 to 6.8. Thymol blue is yellow at the acidic end of its range, blue at the basic end of its range, and its pH range is 8.0 to 9.6. Since the solution is blue when bromocresol green is added and orange when chlorophenol red is added, the pH of the solution must be between 5.4 and 6.8. The only possible value in this range is 6.0, which is why it is the most likely pH of the solution.

The molar masses of the compounds are as follows:

Sodium hydroxide (NaOH): 39.99 g/mol. Water (H₂O): 18.

To calculate the molar mass of each compound, we need to determine the atomic masses of the elements in the compound and sum them up according to their respective stoichiometric coefficients.

Sodium hydroxide (NaOH):

The atomic mass of sodium (Na) is 22.99 g/mol, the atomic mass of oxygen (O) is 16.00 g/mol, and the atomic mass of hydrogen (H) is 1.01 g/mol. The stoichiometric coefficients for Na and O are 1, while for H it is also 1.

Molar mass of NaOH = (1 * Na) + (1 * O) + (1 * H) = (1 * 22.99) + (1 * 16.00) + (1 * 1.01) = 39.99 g/mol.

Water (H₂O):

The atomic mass of oxygen (O) is 16.00 g/mol, and the atomic mass of hydrogen (H) is 1.01 g/mol. The stoichiometric coefficient for O is 1, while for H it is 2.

Molar mass of H₂O = (2 * H) + (1 * O) = (2 * 1.01) + (1 * 16.00) = 18.02 g/mol.

Glucose (C₆H₁₂O₆):

The atomic mass of carbon (C) is 12.01 g/mol, the atomic mass of hydrogen (H) is 1.01 g/mol, and the atomic mass of oxygen (O) is 16.00 g/mol. The stoichiometric coefficients for C, H, and O are 6, 12, and 6, respectively.

Molar mass of C₆H₁₂O₆= (6 * C) + (12 * H) + (6 * O) = (6 * 12.01) + (12 * 1.01) + (6 * 16.00) = 180.18 g/mol.

Calcium sulfate (CaSO₄):

The atomic mass of calcium (Ca) is 40.08 g/mol, the atomic mass of sulfur (S) is 32.07 g/mol, and the atomic mass of oxygen (O) is 16.00 g/mol. The stoichiometric coefficients for Ca, S, and O are 1, 1, and 4, respectively.

Molar mass of CaSO4 = (1 * Ca) + (1 * S) + (4 * O) = (1 * 40.08) + (1 * 32.07) + (4 * 16.00) = 136.14 g/mol.

Magnesium phosphate (Mg₃3PO₄)₂):

The atomic mass of magnesium (Mg) is 24.31 g/mol, the atomic mass of phosphorus (P) is 30.97 g/mol, and the atomic mass of oxygen (O) is 16.00 g/mol. The stoichiometric coefficients for Mg, P, and O are 3, 2, and 8, respectively.

Molar mass of Mg₃(PO₄)₂ = (3 * Mg) + (2 * P) + (8 * O) = (3 * 24.31) + (2 * 30.97) + (8 * 16.00) = 262.86 g/mol.

Therefore, the molar masses of the compounds are as follows:

Sodium hydroxide (NaOH): 39.99 g/mol

Water (H₂O): 18.

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Answer: Spontaneous combustion of a person is an instant ignition of the body without any external influence, that is, there are no signs of fire or fire at all.

Spontaneous human combustion (SHC) is a phenomenon in which a human body is said to suddenly and inexplicably catch fire, burning to ashes without any external source of ignition.

Phenomenon is a broad term that can be used to describe any observable occurrence. It is usually used to describe events that are extraordinary or beyond the norm of what is usually seen. The phenomenon can be natural or man-made, and can range from the spectacular to the mundane. Phenomenon can also refer to a concept or idea that is widely accepted or believed. Phenomenon can also be used to describe any event or occurrence that is remarkable or noteworthy, regardless of whether it is natural or man-made.

It has been a subject of interest and speculation for centuries, and has been cited as a phenomenon in various works of literature. However, there is no scientific consensus on the subject and the cause of SHC remains unknown. Many skeptics argue that it is likely that SHC is caused by external factors, such as a nearby flame, rather than an internal combustion.

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Answer:  the resulting compound to be neutral, two bromine anions must combine with one magnesium cation to form magnesium bromide (MgBr2).

Explanation: Because the reaction between the two is

Bromine reacts with magnesium to form magnesium brom and

how is magnesium bromide formed? Magnesium bromide can be synthesized by reacting hydrobromic acid with magnesium oxide and crystallizing the product. It can also be made by reacting magnesium carbonate and hydrobromic acids, and collecting the solid left after evaporation.

The complete sentences are:

Page 3:

The effect of energy in phase transitions of matter is that it is required to break the intermolecular forces that hold the particles of a substance together. When energy is added to a substance, the particles move faster and the intermolecular forces are broken. This can cause the substance to change phase.

The interactive demonstration on the sample of water shows that energy is required to melt ice and boil water. When the ice is heated, the particles start to move faster and the ice melts. The temperature of the water stays constant at 0°C until all of the ice has melted. This is because the energy is being used to break the intermolecular forces in the ice. Once all of the ice has melted, the temperature of the water starts to rise again. When the water is boiled, the particles move so fast that they escape from the liquid state and become a gas. The temperature of the water stays constant at 100°C until all of the water has boiled. This is because the energy is being used to break the intermolecular forces in the water. Once all of the water has boiled, the temperature of the steam starts to rise again.

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Page 4:

Heating curves show the temperature of a substance as it is heated. The curve has a horizontal line at the melting and boiling points, which indicates that the temperature does not change during these phase changes.

Cooling curves show the temperature of a substance as it is cooled. The curve has a horizontal line at the melting and boiling points, which indicates that the temperature does not change during these phase changes.

Both curves show that the temperature of a substance increases as it is heated and decreases as it is cooled.

A heating curve is more choppy than a cooling curve because there are more phase changes during heating than during cooling.

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Answer:

Plastics are synthetic material that is made by natural material.

(I) is correct option.

Explanation:

Given that,

The statements are,

(I). It is a synthetic material that comes from natural resources.

(II). It is a synthetic material that does not come from natural resources.

(III). It is a natural material that is made from synthetic resources.

(IV). It is a natural material made from natural resources.

We know that,

Plastic :

Plastics are organic polymers of high molecular mass and often contain other material.

They are usually synthetic which is get from petrochemicals.

Through the polymerisation process, we get plastics from natural materials like, coal, natural gas, salt and crude oil.

So, We can say that, plastics are synthetic material that is made by natural material.

Hence, Plastics are synthetic material that is made by natural material.

(I) is correct option.

Answer:

a chain of repeating compounds found in both natural and synthetic materials

Explanation:

Not all polymers are natural materials.

Answer:

b  is constant

Explanation:

The half-life of a radioisotope is constant throughout its life cycle.

Half-life is the time taken for half of the radioactive nuclei to disintegrate.

Every radionuclide has its characteristic half-life and it is independent of the number of radioactive atoms.

Therefore, the most ideal statement about half-life is that it is constant.

The null hypothesis (H0) states that the average time it takes smokers to quit smoking is greater than or equal to 16 years, while the alternative hypothesis (Ha) suggests that the average time is less than 16 years.

In the given scenario, the null and alternative hypotheses are as follows:

a) H0: 16 (The average time it takes smokers to quit smoking is greater than or equal to 16 years)

b) Ha: 16 (The average time it takes smokers to quit smoking is less than 16 years)

c) This is a left-tailed test because the alternative hypothesis (Ha) suggests a decrease in the average time to quit smoking.

d) To find the p-value, we need to conduct a statistical test. The test statistic (t-value) can be calculated using the sample mean, population standard deviation, sample size, and the hypothesized population mean (16 years). Using the t-distribution and degrees of freedom (n-1 = 24), the p-value can be determined.

e) Based on the p-value obtained from the test, we compare it to the significance level (α = 0.05). If the p-value is less than α, we reject the null hypothesis. Otherwise, we fail to reject the null hypothesis.

f) In the conclusion, we state whether there is sufficient evidence to reject the claim. If the p-value is less than the significance level (α = 0.01), we can conclude that there is sufficient evidence to reject the claim. However, if the p-value is greater than α, we fail to reject the claim.

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The amount of caffeine that can be extracted from the aqueous solution into the three portions of methylene chloride is \(0.070g.\).

Caffeine is a stimulant drug that is found naturally in tea, coffee, chocolate, and some other plants. It is a molecular compound composed of 8 carbon atoms (C8), 10 hydrogen atoms (H10), 4 nitrogen atoms (N4), and 2 oxygen atoms (O2).

This can be calculated using the following equation:

Caffeine Extracted = (Amount of caffeine dissolved in water) / (Volume of water) x (Volume of methylene chloride)

\(Caffeine Extracted =\frac{ (Amount of caffeine dissolved in water) }{ (Volume of water) * (Volume of methylene chloride)}\\\\\\Caffeine Extracted = \frac{(0.070 g) }{(4.0 mL) * (2.0mL)}\\ \\ = 0.035 g\)

Therefore, the total amount of caffeine that can be extracted into the three portions of methylene chloride is \(0.070g\)

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When any chemical equation is not balanced then that is known as skeletal chemical equation. We need to balance it because as we know that mass can neither be created nor be distroyed and also the number of atoms on the reactant side should always be equal to the compounds on the product side .