How could the student increase the effect on the stream of water and create a greater deflection? (please look at both photos) (this is not a multiple choice question just 1)
- Decrease the distance between the charged rod and the water.
- Increase the distance between the charged rod and the water.
- Increase the flow of water.
- None of the above would increase the effect on the stream of water.

The calculated ΔH reaction will be unaffected because ΔH reaction is independent of the value of the heat capacity of the solution.

Heat of reaction is also known as enthalpy of reaction and is defined as the amount of heat energy released or absorbed during a chemical reaction that occurs at constant pressure.

It is the difference between the total enthalpy of the products and the total enthalpy of the reactants, and is usually expressed in units of joules (J) or kilojoules (kJ).

The heat capacity of the solution refers to the amount of heat required to raise the temperature of the solution by a certain amount, whereas ΔH reaction refers to the heat of the chemical reaction itself and is independent of the heat capacity of the solution.

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The water in this experiment absorbs 20,920 J of energy.

What is Energy?  

Energy is the capacity of a physical system to perform work. It can exist in many forms, such as kinetic energy (the energy of motion), potential energy (energy that is stored), thermal energy (energy in the form of heat), electrical energy, and more. Energy can be transformed from one form to another, but it cannot be created or destroyed, only transferred or converted.

To calculate the energy absorbed by the water, we can use the formula:

Q = m * c * ΔT

Where Q is the energy absorbed, m is the mass of the water, c is the specific heat of water, and ΔT is the change in temperature.

Given:

Mass of water (m) = 200.0 g

Specific heat of water (c) = 4.18 J/g°C

ΔT = T₂ - T₁ = 45.1°C - 20.1°C = 25.0°C

Using the formula:

Q = 200.0 g * 4.18 J/g°C * 25.0°C = 20,920 J

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The flashbulb contains approximately 0.00291 grams of O₂(g).

The ideal gas law relates the pressure (P), volume (V), temperature (T), and amount of gas (n) through the equation PV = nRT, where R is the universal gas constant. Rearranging this equation to solve for n gives n = PV/RT.

To find the amount of O₂(g) in the flashbulb, we first need to convert the volume to liters and the temperature to Kelvin:

V = 1.70 mL = 0.00170 L

T = 29.0 °C + 273.15 = 302.15 K

We can then use the ideal gas law to calculate the amount of O₂(g):

n = PV/RT

n = (2.30 atm)(0.00170 L)/(0.0821 L·atm/mol·K)(302.15 K)

n = 9.10 × 10⁻⁵ mol O₂

Finally, we can convert from moles to grams using the molar mass of O₂:

m = n × M

m = (9.10 × 10⁻⁵ mol)(32.00 g/mol)

m = 0.00291 g O₂

As a result, the flashbulb contains around 0.00291 grams of O₂(g).

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Answer: Magnesium

Magnesium, in its elemental form, has 12 protons and 12 electrons. The neutrons are a different matter. Magesium's average atomic mass is 24.305 atomic mass units, but no magnesium atom has exactly this mass.

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The osmotic pressure of the solution is 25.48atm

Data;

The osmotic pressure of the solution is calculated as

\(\pi = iMRT\)

The Vant hoff factor of the factor = 4

Let's calculate the molarity of the solution;

\(M = \frac{number of moles}{volume}\)

Number of moles = mass / molar mass

\(n = \frac{mass}{molar mass} \\\)

substitute the values into the formula and solve for it

\(n = \frac{69.5}{162.20} \\n = 0.428 moles\)

The molarity of the solution is calculated as

\(M = \frac{number of moles}{volume} \\M = \frac{0.428}{2.35} = 0.182 mol/L\)

The osmotic pressure of the solution is calculated as

\(\pi = iMRT\\\pi = 4 * 0.182 * 35\\\pi = 25.48 atm\)

The osmotic pressure of the solution is 25.48atm

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Answer:

The element X is sulfur.

Sulfur will gain 2 electrons to become an ion.

The charge of sulfide ion is (2-).

Explanation:

To prepare 12 capsules each containing 80 mg of morphine sulfate and 3.2 mg of naltrexone hydrochloride, the following calculations can be used:

Calculate the total weight of the morphine sulfate and naltrexone hydrochloride: 80 mg + 3.2 mg = 83.2 mg

Calculate the weight of the diluent required: 12 capsules * 83.2 mg/capsule = 999.6 mg

Calculate the volume of the diluent required based on its density (assume a density of 0.9 g/mL for lactose): 999.6 mg / (0.9 g/mL) = 1.11 mL

Calculate the weight of the diluent required based on its volume: 1.11 mL * 0.9 g/mL = 1 g

Calculate the amount of the diluent required based on the sensitivity of the prescription balance: 1 g / (6 mg/g) = 166.7 mg

The amount of the diluent required according to this calculation is 166.7 mg. This amount should be rounded up to the nearest whole number (167 mg) to account for the 4% error tolerance. The final aliquot would therefore contain 167 mg of lactose, 80 mg of morphine sulfate, and 3.2 mg of naltrexone hydrochloride.

Answer:

\(m_{K_2O}^{by\ K} =3.01gK_2O\)

Explanation:

Hello!

In this case, since 2.50 g of both potassium (molar mass = 39.1 g/mol) and gaseous oxygen (molar mass = 32.0 g/mol) react in a 4:1 and 1:2 mole ratio respectively, to produce potassium oxide (molar mass = 94.2 g/mol), we evaluate the mass of potassium oxide yielded by each reactant in order to identify the limiting one via stoichiometry:

\(m_{K_2O}^{by\ K}=2.50gK*\frac{1molK}{39.1gK}*\frac{2molK_2O}{4molK}*\frac{94.2gK_2O}{1molK_2O} =3.01gK_2O\\\\m_{K_2O}^{by\ O_2}=2.50gO_2*\frac{1molO_2}{32.0gO_2}*\frac{2molK_2O}{1molO_2}*\frac{94.2gK_2O}{1molK_2O} =14.7gK_2O\)

Thus, since the 2.50 g of potassium yields 3.01 g of potassium oxide, we infer it is the limiting reactant and that is the mass of produced product by the reaction.

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Answer: Calculating mass quick check

1. The mass of the reactants must be equal to the mass of the products. The total number of moles of the reactants can be more or less than the total number of moles of the products.

2. Divide the mass of the reactant by its molar mass to find the number of moles of the reactant. Use the chemical equation to find the number of moles of the product. Multiply the number of moles of the product by its molar mass to find the mass of the product.

3. 2(108 g/mol)+32 g/mol=248 g/mol; (248 g/mol)(0.02 mol)=4.96 g

4. 19.5 g

5. 853.5 g

You're welcome

Sodium carbonate, often referred to as Na2CO3, is a chemical compound composed of atoms of sodium (Na), carbon (C) and oxygen (O).

It is also sometimes called washing soda or soda ash. At room temperature, sodium carbonate is a white, crystalline solid that is very soluble in water. According to the chemical formula of the sodium carbonate molecule, Na2CO3, each molecule consists of two sodium atoms (Na), one carbon atom (C) and three oxygen atoms (O). The atomic configuration in sodium carbonate is shown in the given diagram.

A trigonal planar arrangement is formed when the central carbon atom is bonded to three oxygen atoms. The structure of sodium carbonate is completed by two sodium atoms joined to oxygen atoms.

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Sally is wrong because copper is less electropositive than hydrogen, thus, can not displace hydrogen from dilute acids.

The reactions to prepare copper (ii) chloride are:

the chlo­ri­na­tion of cop­per sul­fide at a high tem­per­a­ture

reaction of copper (ii) oxide with dilute hydrochloric acid

The equations of the given reactions are as follows:CuS + Cl₂ ---> CuCl₂ + SCuO + 2HCl ----> CuCl₂ + H₂O

Reactive metals are metals that readily give up their electrons to form positive ions.

Reactive metals displace hydrogen from dilute acids. They are found in group 1A and 2A of the periodic table. Copper is not a reactive metal and will not displace hydrogen from acids.

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Sally is wrong because copper chloride is not made from the reaction of copper and dilute hydrochloric acid.

2. Copper (ii) chloride can be prepared as follows:

3. the equations of the reaction are:

Single replacement reactions are reactions in which a more reactive atom replaces another atom in a compound.

An example of a single replacement reaction is the reaction of chlorine gas with copper sulfide at high temperatures to form copper chloride.

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Answer:

Orbiter

Explanation:

Space shuttles are made out of three main parts: rocket boosters, a fuel tank, and orbiter (the part that resembles an airplane

Based on the balance given, the statements that are true if you were to use this balance to measure the mass of a sample are option B and G.

A scale or balance is an instrument which is used to measure weight or mass of an object. These are also known as mass scales, weight scales, mass balances, and weight balances. The traditional scale consists of two plates or bowls suspended at equal distances from a fulcrum. There are several varieties of balances, with various limits on their accuracy. Two common kinds of balances are the centigram (0.00) and the analytical (0.0000). The uncertainty of a centigram balance is one hundredth of a gram (± 0.01 g). A mass that falls between 1 gram and 9 grams measured on this balance will always have 3 significant figures as it will read 1.00 or 9.00 on the scale.

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The maximum distance between the two white balls is 2R, and the maximum angle between them is 180 degrees (or π radians).

Maximum distance between the balls:

The maximum distance between the two white balls will be achieved when they are placed at opposite ends of a diameter of the circular region.

In this case, the distance between them will be equal to the diameter of the circle, which is 2R.

Maximum angle between the balls:

To find the maximum angle between the two balls, imagine the center of the circle as the vertex of the angle, and the positions of the two balls as the endpoints of the angle's two sides.

Since the balls are located at opposite ends of a diameter, the angle formed will be a straight angle, which is 180 degrees (or π radians).

So, the maximum distance between the two white balls is 2R, and the maximum angle between them is 180 degrees (or π radians).

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Two white balls, A and B, are placed on a flat surface inside a circular region of radius R. What is the maximum distance and maximum angle between the balls that can be achieved

Answer:

the electrical attraction between large numbers of cations and anions. Results from the sharing of electron pairs between two atoms. ... A covalent bond in which the bonded atoms have an unequal attraction for the shared electrons.

Explanation:

agriculture. The largest source of pollution to the Bay comes from agricultural runoff, which contributes roughly 40 percent of the nitrogen and 50 percent of the phosphorus entering the Chesapeake Bay.

Airborne nitrogen is one of the most significant polluters of the Chesapeake Bay and its tributaries. Excess nitrogen may drive the growth of algae blooms, preventing sunlight from reaching underwater grasses and creating low-oxygen "dead zones" that smother marine life. Nitrogen and phosphorus occur naturally in aquatic habitats, but human activities such as fertilizer usage, wastewater management, fossil fuel combustion, and soap and detergent discharge inject excess nutrient pollution into ecosystems quicker than ecosystems can respond. 1At Home and Around the Neighborhood: Fertilizers, yard and pet waste, and some soaps and detergents contain nitrogen and phosphorus and, if not utilized or disposed of appropriately, can contribute to nutrient contamination.

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Answer:

It is KEPLER

Explanation:

Kepler defined the sun's orbit.

okay.

Answer:

Lower the pH slightly

Explanation:

The mixture of HF, hydrofluoric acid and KF, potassium fluoride produce a buffer that is defined for the equilibrium:

HF(aq) → H⁺(aq) + F⁻(aq)

The buffer can maintain the pH of a solution despite the addition of strong bases or acids.

The reaction of HF with Ca(OH)2 is:

2HF + Ca(OH)2 → 2H2O + CaF2

That means the calcium hydroxide is decreasing the concentration of HF. Based on the equilibrium, the H+ and F- ions will decrease in order to produce more HF. As H+ is decreasing due the equilibrium and not for the addition of a strong base, the pH is decreasing slightly.

Concentration of A after 50 hours = 0.1013 M.

Given that initial concentration of A = 1.621 M

After  first half life is after 12.5 hours, concentration is reduced to 0.8105 M.

Concentration of A after 12.5 hours is 0.8105 M

After second half life ( ie 25 hours = 2*12.5 h), concentration of A is reduced to 0.4053 M

After 3rd half life (ie 37.5 hours =  3*12.5 hours) , concentration of A is reduced to 0.2026 M ( Half of 0.4053 M)

Therefore Concentration of A after 50 hours = 0.2026 M

After 4th half life (ie 50 hours = 4*12.5 hours), concentration of A is reduced to 0.1013 M ( Half of 0.2026 M)

Therefore concentration of A after 50 hours = 0.1013 M.

Concentration is the ratio of a constituent's abundance to the mixture's overall volume. The concentration can refer to any form of chemical mixture, but is most usually used to describe the solutes and solvents in solutions. There are several different types of mathematical descriptions: mass concentration, molar concentration, number concentration, and volume concentration.

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Answer:  

A. unexpected change in odor

Explanation: Common physical changes include melting, change of size, volume, color, density, and crystal form. Example the classic baking soda and vinegar reaction provides evidence of a chemical change due to the formation of a gas and a temperature change.

The cobalt with a half life of 5.3  years have the decay constant of 0.13 yrs⁻¹ . After 10.46  years 25.7 % of cobalt -60 will be there.

Heavy unstable radioactive isotopes undergo nuclear decay by the emission of charged particles. Nuclear decay is a first order reaction.

Thus, the decay constant k  = 1/t ln W0/Wt

where t is the time of decay, W0 be the initial amount and Wt be the amount after time t.

The half life of the element =  5.3 years

k = 0.693/5.3yrs =  0.13 yrs⁻¹.

The time of decay is given 10.6 years.

Then,

t = 1/k  ln Wo/(Wt )

10.6 = ln(100/wt)/ 0.13 yrs⁻¹

(100/wt) = ln (10.6×0.13)

      Wt  = 25.7 %.  

Therefore, 25.7 % cobalt -60 sample will remain after 10.6 years.

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Answer:

All of the water on earth

Answer:

Nuclear fusion is a kind of nuclear reaction in which two lighter nuclei combine under suitable conditions to form heavier nuclei under suitable conditions

Explanation:

Let us define what Nuclear fusion is

Nuclear fusion occur as a result of two or more atoms coming together to form a more complex or a different atom entirely, and after the process, energy is released or absorbed.

From the given options, the correct answer is

The process by which small nuclei combine into a larger nucleus

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Answer: The balanced reaction equation is:

4

F

e

(

s

)

+

3

O

2

(

g

)

→

2

F

e

2

O

3

(

s

)

Initial moles of oxygen reactant (given) =  

12.0

m

o

l

According to the balanced equation the iron and oxygen reactants combine in a 4:3 molar ratio. Therefore for complete consumption of both reactants we require:

Initial moles of iron reactant =  

4

3

×

12.0

m

o

l

=

16.0

m

o

l

The number of mole of Fe needed to react with 12 moles of O₂ is 16 moles

We'll begin by writing the balanced equation for the reaction. This is given below:

3O₂ + 4Fe —> 2Fe₂O₃

From the balanced equation above,

3 moles of O₂ reacted with 4 moles of Fe.

With the above information, we can obtain the number of mole of Fe required to react with 12 moles of O₂. This can be obtained as follow:

From the balanced equation above,

3 moles of O₂ reacted with 4 moles of Fe.

Therefore,

12 moles of O₂ will react with = \(\frac{12 * 4 }{3}\\\\\) = 16 moles of Fe

Thus, 16 moles of Fe are needed to react with 12 moles of O₂

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It will take 1200 minutes for the concentration of reactant to drop to 0.025 mol/liter.

The rate of reaction is given by the following equation:

\(-r_{A} = \frac{200C_{A} C_{EO}}{2+C_{A}} \frac{mol}{liter . min}\)

where

\(-r_{A}\) = is the rate of reaction (mol/liter/min)

\(C_{A}\) = is the concentration of reactant A (mol/liter)

\(C_{EO}\) =  is the concentration of enzyme E (mol/liter)

Given that \(C_{EO}\) = 0.001 mol/liter and \(C_{AO}\) = 10 mol/liter. Find the time needed for the concentration of reactant to drop to 0.025 mol/liter.

Set up the following equation and solve for t:

\(C_{AO} - C_A = -r_A t\)

Substituting the given values:

10 - 0.025 = -(200)(0.025)(0.001)t

Solving for t:

t = 1200 min

Therefore, it will take 1200 minutes for the concentration of reactant to drop to 0.025 mol/liter.

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Answer:

15 mL of O₂.

Explanation:

The balanced equation for the reaction is given below:

2H₂O —> 2H₂ + O₂

From the balanced equation above,

2 mL of H₂O reacted to produce 2 mL of H₂ and 1 mL of O₂.

Next, we shall determine the volume of H₂O needed to produce 30 mL of H₂. This can be obtained as follow:

From the balanced equation above,

2 mL of H₂O reacted to produce 2 mL of H₂.

Therefore, 30 mL of H₂O will also react to produce 30 mL of H₂.

Thus, 30 mL of H₂O is needed for the reaction.

Finally, we shall determine the volume of O₂ produced from the reaction. This can be obtained as follow:

From the balanced equation above,

2 mL of H₂O reacted to produce 1 mL of O₂.

Therefore, 30 mL of H₂O will react to produce = (30 × 1)/2 = 30/2 = 15 mL of O₂.

Thus, 15 mL of O₂ were produced from the reaction.

Answer:

Ray

Explanation:

Rays of the sun is used by plants to make their own food

Answer:

+284.9 kJ

Explanation:

So in this equation you get the heat absorption which is +40.7 kJ.

We can see that H2O (l) to H2O (g) is a 1:1 ratio, meaning forever 1 mole of H2O (l), 1 mole of H2O (g) is produced.

All we have to do now is find how much heat absorption there in 7 moles of water so all we have to do is:

7(40.7 kJ) = 284.9 kJ

Answer:

Oxygen is the main element of life.

Explanation:

Because Oxygen allows us to breathe..

I hope this helps you!

XoXo Makayla

Therefore, in a chemical reaction, the two requirements necessary for equilibrium are that no resultant force and torque must act on the substance.

When the rates of the forward and reverse reactions are identical, equilibrium has occurred. At equilibrium, the concentrations of each reactant and product are both constant. A solid substance subjected to three forces with divergent lines of action is in equilibrium if all three of the following three circumstances hold true: Coplanar action lines are present (in the same plane) The paths of action have come together (they cross at the same point) These forces add up to a vector with a total of zero. First, there must be no net force acting on the item. Second, there must be no net torque pulling on the object.

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