A 25. 0 g sample of warm water at 40. 0⁰c was added to a 25. 0 g sample of water in a styrofoam coffee cup calorimeter initially at 20. 0⁰c. The final temperature of the mixed water and calorimeter was 29. 5⁰c. Calculate the heat capacity of the coffee cup calorimeter. The specific heat of water is 4. 184 j/g∙⁰c.

Answer:

covalent bond- a chemical bond that is the sharing of electron pairs between atoms

The reaction given is a redox reaction, and based on the given equilibrium constant, the standard voltage (E°) is positive, while the standard free energy change (∆G°) is negative.

The standard voltage (E°) of a redox reaction represents the tendency of the reaction to proceed in the forward direction. A positive E° indicates that the reaction is spontaneous in the forward direction, meaning that the reduction half-reaction is favored. In the given reaction, copper (Cu) is being oxidized to Cu2+, while silver ions (Ag+) are being reduced to form solid silver (Ag). Since the reaction is spontaneous in the forward direction, E° must be positive.

The standard free energy change (∆G°) of a reaction determines the spontaneity of the reaction. A negative ∆G° indicates that the reaction is thermodynamically favorable and will proceed spontaneously in the forward direction. Based on the relationship between ∆G° and the equilibrium constant (K), which is given as 3.7 x 10^15, we can determine that ∆G° is negative. The equation relating ∆G° and K is ∆G° = -RT ln(K), where R is the gas constant and T is the temperature in Kelvin. Since ln(K) is positive, ∆G° must be negative for a large equilibrium constant like \(3.7 \times 10^{15\).

Therefore, the correct description for this reaction is: (A) E° is positive and ∆G° is negative.

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Answer:

Botched surgery, inhaling harmful toxins and smoking.

Explanation:

Smoking is a death wish.

Nicole can access global markets through distributors while avoiding logistical problems and several trade-related concerns. Specialty shops tend to be more expensive and have less choice. at last, Nicole will pay more for the mattress if she gets it at the specialty store.

The simplicity of employing a distributor is its key benefit. Typically, the distributor is in charge of the packaging, shipping, and associated paperwork for customs. The concentrate on a specific class of products that a specialty store has is one of its main advantages. This offers business owners and staff the ability to gain knowledge and a reputation for selection and competence within the store's designated specialization.

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The pressure of the gas would now be 2/3 of its initial value.

We know that we can be able to use the ideal gas equation to be able to obtain the parameters that concern gases. In this case, we are dealing with the volume, temperature and volume all at once hence we need to use the general gas equation.

Initial pressure of the gas P1 = P

Final pressure of the gas P2 = ??

Initial volume of the gas V1 = V

Final volume of the gas V2 = 3V

Initial temperature of the gas T1 = T

Final temperature of the gas = 2T

P1V1/T1 = P2V2/T2

P1V1T2 = P2V2T1

P2 = P1V1T2/V2T1

P2 = P * V * 2T/3V * T

P2 = 2/3P

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Answer:

The answer is "Comet".

Explanation:

The comets were interstellar frozen gas of snowballs, stone, and debris orbiting the sun, which are also the size of average towns while frozen. As even the orbit of the comet passes near the sun, it warms up and spreads dust and gas into a big floating head greater than most stars.  

Answer: A Planet

Explanation:

The International Astronomical Union defines a planet as a spherical object that orbits a star. Planets clear the neighborhood around their orbits (i.e., no other bodies share their orbits).

Answer:

the other stars are much farther away from Earth than our sun

When Solid sodium fluoride is dissolved in distilled water the equation will be ; NaF(s) + H2O(l) → Na+(aq) + F-(aq) + H2O(l) . Then the final solution will only be slightly basic  due to fluoride ion (F-)  been conjugate base of a weak acid.

A chemical equation is a symbolic representation of a chemical reaction. It uses chemical symbols and formulas to describe the reactants and products of a chemical reaction. The reactants are the substances that are used up in the reaction, while the products are the substances that are produced by the reaction.

A chemical equation includes the chemical formulas of the reactants and products, as well as coefficients that indicate the relative amounts of each substance involved in the reaction. These coefficients are used to balance the equation, ensuring that the number of atoms of each element is the same on both sides of the equation.

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Answer:

a proton turns into an atom that goes kabloey into fission products and other neutrons.

Explanation:

The  mass percentage of silver in the salt is 63.58 %

Electrolysis refers to the decomposition of a substance by an electric current.

It is a technique that uses direct electric current (DC) to drive an otherwise non-spontaneous chemical reaction.

Electrolysis is commercially important as a stage in the separation of elements from naturally occurring sources such as ores using an electrolytic cell.    

Ag⁺ + e⁻  --> Ag

\(\rm W_{Ag} = Z \times I\times t\\\\\\\rm W_{Ag} = \dfrac{Z \times I\times t\\}{96500}\\\\\\W_{Ag} = Mass \; of\; Ag \; plate\\\\\\\rm W_{Ag} = \dfrac{108 \times 2.82\times 695\\}{96500}\\\\\\W_{Ag} = 2.193 g \\\\\\Mass \;percentage\; of \;silver\; in\; salt = \dfrac{mass \;of\;Ag}{Total \;mass\;of\;salt}\times 100\\\\\\\\=\dfrac{2.193}{3.45} \times 100\\\\\\=63.58 \%\\\)

Z = Electrochemical Equivalent.

Z = atomic weight/nF      

n = no. of electron, F = 96500 , Faraday's Constant

Chemical formula of the salt will be determined as

moles of Ag = moles of AgX

\(\rm Molecular \; weight \; of \; Ag = 108\\\\\\\rm\dfrac{2.193}{108}= \dfrac{3.45}{M_{AgX}}\\\\\\\\M_{AgX} =170 \;g/mol\\\\\\\\M_{AgX} = M_{Ag} + M_{X}\\\\\\\\170= 108 + M_{X}\\\\\\\\M_{X}= 170-108 = 62\\\\\)

and therefore the salt is AgNO₃ .

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Answer: There are \(3.011 \times 10^{23}\) atoms present in 0.500 mol of \(CO_{2}\).

Explanation:

According to the mole concept, there are \(6.022 \times 10^{23}\) atoms present in 1 mole of a substance.

In a molecule of \(CO_{2}\) there is only one carbon atom present. Therefore, number of carbon atoms present in 0.500 mol of \(CO_{2}\) are as follows.

\(1 \times 0.500 \times 6.022 \times 10^{23}\\= 3.011 \times 10^{23}\)

Thus, we can conclude that there are \(3.011 \times 10^{23}\) atoms present in 0.500 mol of \(CO_{2}\).

Answer:

6.31x10^-10

Explanation:

Answer: 6.31 x 10^-10

Explanation:

Answer: The total pressure of given mixture that contains 3 gases is 7.68 atm.

Explanation:

Given: Partial pressure of gases is:

Gas A = 4.2 atm

Gas B = 780 mm Hg

Convert mm Hg into atm is as follows.

\(1 mm Hg = 0.00131579 atm\\780 mm Hg = 780 mm Hg \times \frac{0.00131579 atm}{1 mm Hg}\\= 1.02 atm\)

Gas C = 250 kPa

Convert kPa into atm as follows.

\(1 kPa = 0.00986923 atm\\250 kPa = 250 kPa \times \frac{0.00986923 atm}{1 kPa}\\= 2.46 atm\)

Total pressure is the sum of partial pressures of gases present in the mixture.

Therefore, total pressure of given mixture is calculated as follows.

\(P_{total} = P_{A} + P_{B} + P_{C}\\= 4.2 atm + 1.02 atm + 2.46 atm\\= 7.68 atm\)

Thus, we can conclude that the total pressure of given mixture that contains 3 gases is 7.68 atm.

7.2 g progesterone 22.32 g dimethyl-β-cyclodextrinad 360 mL, purified water

To calculate the quantity of each ingredient needed to prepare twenty-four 15-mL containers of the progesterone nasal spray, the following steps will be used.

Firstly, it is important to note the given values;

they are as follows:

Progestrone = 0.30 g

Dimethyl-β-cyclodextrin = 0.93 g

Water = ad 15 mL

Next, convert the number of containers to liters;

24 x 15mL = 360 mL or 0.36L

Therefore, to calculate the quantity of each ingredient, the formula below will be used:

Quantity of each ingredient = (Amount required per 1L) x 0.36L

Now, let's calculate the quantity of each ingredient.

1. Progesterone

Quantity of progesterone = (0.30 g/L) x 0.36L

Quantity of progesterone = 0.108 g

Therefore, the quantity of progesterone needed to prepare twenty-four 15-mL containers of the progesterone nasal spray is 0.108 g.

2. Dimethyl-β-cyclodextrin

Quantity of dimethyl-β-cyclodextrin = (0.93 g/L) x 0.36L

Quantity of dimethyl-β-cyclodextrin = 0.335 g

Therefore, the quantity of dimethyl-β-cyclodextrin needed to prepare twenty-four 15-mL containers of the progesterone nasal spray is 0.335 g.

3. Water

Water is added to make up the remaining volume required, which is 360 mL.

Therefore, the quantity of water needed is:

Quantity of water = 360 mL - (0.30 g + 0.93 g)

Quantity of water = 359.77 mL

Therefore, the quantity of water needed to prepare twenty-four 15-mL containers of the progesterone nasal spray is 359.77 mL.

Answer: 7.2 g progesterone22.32 g dimethyl-β-cyclodextrinad 360 mL, purified water

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Boyle's Law, which states that at constant temperature, a gas's pressure and volume are inversely related, can be used to address this issue.

Boyle's Law says that P1V1 = P2V2.

Where: P1 = The gas's initial pressure (in torr)

V1 is the container's initial volume (in millilitres).

P2 stands for the gas's post-volume change pressure (unknown).

V2 is the revised volume of the container (in millilitres).

Let's solve for P2 by entering the provided values into the equation:

P₁ = 757.2 torr

V2 = 132.5 mL V1 = 81.4 mL

P2 = ambiguous

P₁V₁ = P₂V₂

P2 equals 757.2 torr x 81.4 mL x 132.5 mL.

P2 times 132.5 mL = 61702.08 torr * mL

61702.08 torr = P₂ * 132.5

P2 = 132.5 mL / 61702.08 torr

P₂ ≈ 465.69 torr

as a result, the gas's pressure

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Answer:

n (moles) = m (mass) / M (molar mass)

Explanation:

divide the mass by the molar mass, and you have your answer

Claim: The genotype of the mother (Lily) is Bb, and the genotype of the father is BB.

Evidence:

1. Two of Lily's children have blonde hair, which is a recessive trait. This indicates that Lily carries the recessive allele for blonde hair (b).

2. Dark hair is the dominant trait, and Lily's husband is the biological father of all three children. Therefore, the father must carry at least one dominant allele (B) for dark hair.

3. All of Lily's children share the same father, so the father must have passed on the dominant allele for dark hair to each child.

4. Since Lily and her husband have three children, and two of them have blonde hair (recessive phenotype), it is likely that Lily is heterozygous for the hair color gene (Bb), while her husband is homozygous dominant (BB).

Reasoning:

Inherited traits are determined by alleles, or alternative forms of a gene. In this case, the gene for hair color has two alleles: B (dominant for dark hair) and b (recessive for blonde hair). The presence of blonde-haired children indicates that Lily carries the recessive allele (b) for hair color, as blonde hair is a recessive trait. Since all of Lily's children share the same father and two of them have blonde hair, it suggests that the father must have passed on the dominant allele (B) for dark hair to each child. This indicates that Lily's husband is homozygous dominant (BB) for the hair color gene. Therefore, the genotype of Lily is Bb, and the genotype of her husband is BB.

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To arrange the following elements in order of decreasing atomic radius (1 being the largest and 6 being the smallest), we need to consider their positions on the periodic table. Here's the order:

1. Sr (Strontium) - It is in Group 2 and Period 5, so it has the largest atomic radius.
2. Ca (Calcium) - It is in Group 2 and Period 4, having a smaller atomic radius than Sr.
3. Ge (Germanium) - It is in Group 14 and Period 4, so its atomic radius is smaller than Ca but larger than Si.
4. Si (Silicon) - It is in Group 14 and Period 3, with an atomic radius smaller than Ge.
5. S (Sulfur) - It is in Group 16 and Period 3, so it has a smaller atomic radius than Si.
6. Ne (Neon) - It is in Group 18 and Period 2, with the smallest atomic radius among the given elements.

So, the order of decreasing atomic radius is Sr (1) > Ca (2) > Ge (3) > Si (4) > S (5) > Ne (6).

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The coefficients needed to balance the redox reaction are: 2Fe(s) + 3Cl2(g) + 6H+(aq) -> 2Fe3+(aq) + 6Cl-(aq) + 3H2O(l)

The balanced redox reaction requires two molecules of chlorine gas to react with one atom of iron, producing one Fe3+ ion and two chloride ions. We need to balance both the mass and charge on each side of the equation.

Step 1: Balance the atoms other than oxygen and hydrogen.

Fe(s) + Cl2(g) -> Fe3+(aq) + 2Cl-(aq)

Step 2: Balance the oxygen atoms by adding water (H2O) molecules.

Fe(s) + Cl2(g) -> Fe3+(aq) + 2Cl-(aq) + H2O(l)

Step 3: Balance the hydrogen atoms by adding hydrogen ions (H+).

Fe(s) + Cl2(g) + 6H+(aq) -> Fe3+(aq) + 2Cl-(aq) + H2O(l)

Step 4: Balance the charges by adding electrons (e-).

Fe(s) + Cl2(g) + 6H+(aq) -> Fe3+(aq) + 2Cl-(aq) + H2O(l) + 6e-

The balanced equation for the redox reaction is:

2Fe(s) + 3Cl2(g) + 6H+(aq) -> 2Fe3+(aq) + 6Cl-(aq) + 3H2O(l)

The balanced redox reaction is 2 Fe(s) + 3 Cl2(g) -> 2 Fe3+(aq) + 6 Cl-(aq) with coefficients 2, 3, 2, and 6 respectively.

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Answer:

2HNO3 + Ba(OH)2 => Ba(NO3)2 + 2H2O

Explanation:

The liters of ethylene glycol antifreeze would you add to 15 liters of water to protect your engine to -17.8 c the density of ethylene glycol is 1.1g/mol is 8.10 L.

The  density of ethylene glycol = 1.1g/mol

The expression for the molality is as :

m = ΔT / i Kf

Where

ΔT = 17.8 °C

i = 1

Kf = 1.86 c/m

m = 17.8 / ( 1 ×1.86  )

m = 9.57 m

The number of moles = 9.57 / 15

                                     =  143.5 mol

The mass = moles × molar mass

                 = 143.5 × 62.07

                  = 8910 g

The volume of the ethyl glycol = mass / density

                                                   = 8910 / 1.1

                                                   = 8100 mL
The volumes in liters = 8100 / 1000

                                   = 8.10 L

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Answer:

b

Explanation: because i took the test and got a 100

Answer:

Rate cup 1: 36.00 tsp/h.

Rate cup 2: 59.50 tsp/h.

Rate cup 3: 70.13 tsp/h.

Explanation:

Based on the given example, the units must be in tsp/hour. To do this we just have to divide tsp by seconds and then convert it to hours remembering that 1 hour equals 3600 seconds.

Let's calculate each case:

- Cup 1: 1 tsp, 1 minute 40 seconds. Remember that 1 minute equals 60 seconds, so 1 minute and 40 seconds equals 100 seconds. The calculation of the rate will look like this:

The rate of cup 1 is 36.00 tsp/h.

- Cup 2: 2 tsp, 2 minutes 1 second. As we saw before 1 minute equals 60 seconds, so 2 minutes equals 120 seconds. 2 minutes and 1 second equals 121 seconds. The rate of cup 2 will be calculated as:

The rate of cup 2 is 59.50 tsp/h.

- Cup 3: 3 tsp, 2 minutes 34 seconds. 2 minutes are the same that 120 seconds, so 2 minutes 34 seconds equals 154 seconds. The rate of cup 3 is calculated as follows:

The rate of cup 3 is 70.13 tsp/h.

The egg white has 13.6 calories

Explanation:

no of moles = mass / molar mass

mr of Al ( OH)3 = 27+ (16 × 3) + (1 ×3)

= 78

n = 384.3 / 78

n = 4.92692...

n = 4.93

therefore, no of moles = 4.93

Answer:

The substance occupy 961.54 cm³ space.

Explanation:

Given data:

Mass of substance = 750.00 g

Density of substance = 0.78 g/mL

How much space it occupy = ?

Solution:

The space occupy by the substance is equal to its volume. Thus we will calculate the volume by applying density formula. Which is actually the space cover by substance.

d = m/v

d = density

m = mass

v = volume

0.78 g/mL = 750.00 g/ v

v = 750.00 g/ 0.78 g/mL

v = 961.54 mL

1 mL = 1 cm³

v = 961.54 cm³

Thus substance occupy 961.54 cm³ space.

In order to determine how much more acid Cameron used in the second experiment:

If you have the amounts of acid used in both experiments, you can subtract the amount used in the first experiment from the amount used in the second experiment to find the difference.

For example, if Cameron used 100 ml of acid in the first experiment and 200 ml of acid in the second experiment, the difference would be 200 ml - 100 ml = 100 ml.

To calculate the difference, use the formula:

Difference = Amount in the second experiment - Amount in the first experiment.

Replace the "Amount in the second experiment" and "Amount in the first experiment" with the actual values you have.

Remember to provide the specific values of acid used in both experiments to determine the exact difference.

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The postulates in John Dalton's atomic theory later became robust knowledge is various scientists found that sometimes a fraction of an atom can take part in a chemical reaction. Therefore, option D is correct.

In the first section of his thesis, he claims that all matter is composed of indivisible atoms. According to the second component of the theory, the mass and characteristics of every atom in a specific element are the same. Compounds, according to the third section, are combinations of two or more different kinds of atoms.

A chemical combination theory that was first put forth by John Dalton in 1803. The following postulates are involved: (1) Small, indivisible particles make up elements (atoms). (2) Atoms of the same element are all identical; atoms of other elements are of different types. (3) It is impossible to produce or destroy an atom.

Thus, option D is correct.

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