b. Complete the table to show the effect of each change on the gravitational
force between two objects. (2 points)
Change
Multiply one of the masses by 2.
Multiply the distance by 2.
Effect on gravitational force

Answer:

stay the same.

Explanation:  Period 3 consists of the full 1s, 2s, and 2p electron orbitals, plus the 3s and 3p valence orbitals, which are filled with a total of 8 more electrons as we move from left (Na) to the far right (Ar):

Na:  1s2 2s2 2p6 3s1

Ar:    s2 2s2 2p6 3s2 3p6

As we move from left to right, and ignoring the already-filled 1s, 2s, and 2p orbitals, the period three starting and ending elements have the following:

Na: 3s1

Ar: 3s2, 3p6

All the new electrons electrons filled the third energy level (3s and 3p).  So the energy level does not change, just the orbitals.

Two molecules of water (\(H_2O\)) are produced as the products of the reaction.  

In the chemical reaction 2\(H_2\) + \(O_2\) -> 2(\(H_2O\)), two molecules of hydrogen and one molecule of oxygen react to form two molecules of water.

The balanced equation for this reaction is:

2\(H_2\) + \(O_2\)  ----> 2(\(H_2O\))

The number of product molecules in this reaction is equal to the number of reactant molecules that are consumed in the reaction. In this case, there are two molecules of hydrogen \(H_2\) and one molecule of oxygen in the reactant list, so two molecules of hydrogen and one molecule of oxygen are consumed in the reaction.

Therefore, two molecules of water ((\(H_2O\))) are produced as the products of the reaction.  

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Both Technician A and Technician B are correct in their statements about octane ratings and the use of regular and high octane gasoline.

Technician A is correct because most modern engines are designed to use regular grade gasoline, which has an octane rating of 87. This is the most commonly used gasoline and it is suitable for most engines.

Technician B is also correct because high octane gasoline, which has an octane rating of 91 or higher, should only be used when an engine was designed to use it. High octane gasoline is more expensive and is not necessary for most engines. However, some high-performance engines require high octane gasoline to prevent engine knocking and to achieve optimal performance.

Therefore, both Technician A and Technician B are correct in their statements about octane ratings and the use of regular and high octane gasoline.

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Earth diver story type of creation story describes how earth originated from water.

A creation myth or cosmogonic myth is a symbolic narrative of how the world began and how people first came to inhabit it. earth diver is a common character in various traditional creation myths who is sent by a supreme being into the primal waters to find substance (often sand or mud) with which to build habitable land. earth diver featured character are the on who dives into water and bring up a small amount of mud and sand and that's why according to this theory supreme being is responsible for sending animals inside the water to find little bit of mud and sand.

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The pH at the beginning of the titration is 5.03, and the pH at the equivalence point is 1.66.

Volume of pyridine solution (C5H5N) = 25.0 mL

Concentration of pyridine solution (C5H5N) = 0.240 M

Concentration of HBr solution = 0.240 M

pKa of pyridine (B of pyridine) = 1.7 × 10^(-9)

Step 1: Calculation at the beginning of the titration

The initial concentration of pyridine (C5H5N) is 0.240 M, and since pyridine is a weak base, we can use the Henderson-Hasselbalch equation to calculate the pH at the beginning of the titration:

pH = pKa + log([A-]/[HA])

pH = pKa + log([C5H5N]/[HBr])

pH = -log10(1.7 × 10^(-9)) + log10(0.240/0.240)

pH ≈ 5.03

Therefore, the pH at the beginning of the titration is approximately 5.03.

Step 2: Calculation at the equivalence point

At the equivalence point, the moles of HBr added will be equal to the moles of pyridine present initially.

Moles of pyridine (C5H5N) = Volume (in liters) × Concentration

Moles of pyridine = 25.0 mL × (0.240 mol/L) = 6.0 × 10^(-3) mol

Since the moles of HBr added is equal to the moles of pyridine, the concentration of HBr at the equivalence point will be:

Concentration of HBr at equivalence point = Moles of HBr / Volume (in liters)

Concentration of HBr = (6.0 × 10^(-3) mol) / (25.0 mL) = 0.240 M

At the equivalence point, the pyridine has been completely neutralized, and the resulting solution is a strong acid (HBr). The pH of a 0.240 M HBr solution can be directly calculated

pH = -log10(0.240)

pH ≈ 1.66

Therefore, the pH at the equivalence point is approximately 1.66.

The pH at the beginning of the titration is 5.03, and the pH at the equivalence point is 1.66.

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Answer:

Chlorophyll

Explanation:

This is the green pigment that allows photosynthesis to occur

Mitochondria: cell energy

Cytoplasm: what fills the space between organelles in a cell

Chlorine: not sure but you they put it in pools

The moles of water that are produced from 373 moles of ammonia present in any chemical reaction is 746 moles.

Stoichiometry of the reaction gives idea about the amount of entities present in any chemical reaction before and after the reaction.

Given chemical reaction is:

3Al + 3NH₄ClO₄ → Al₂O₃ + AlCl₃ + 3NO + 6H₂O

From the stoichiometry of the reaction it is clear that:

3 moles of Al = produces 6 moles of H₂O

373 moles of Al = produces 6/3×373 = 746 moles of H₂O

Hence required moles of water is 746 moles.

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The % yield is approximately 62.1%.  The percent yield is an important measure of the efficiency of a chemical reaction and indicates the success of the reaction in converting reactants into products.

To calculate the percent yield, we need to compare the actual yield (0.00157 mol) with the theoretical yield and then calculate the percentage.

First, let's calculate the theoretical yield of aspirin. The molar ratio between salicylic acid and aspirin is 1:1, so the number of moles of aspirin produced should be the same as the number of moles of salicylic acid used, which is 0.00253 mol.

Next, we'll calculate the theoretical mass of aspirin:

Mass = moles × molecular weight

Mass of aspirin = 0.00253 mol × 180.16 g/mol

Mass of aspirin = 0.455 g

Now we can calculate the percent yield:

% yield = (actual yield / theoretical yield) × 100

% yield = (0.00157 mol / 0.00253 mol) × 100

% yield = 0.6195 × 100

% yield = 61.95%

Rounding to one decimal place, the percent yield is approximately 62.1%.

The percent yield of the reaction is approximately 62.1%. This means that 62.1% of the maximum possible amount of aspirin was obtained from the given amount of salicylic acid. The percent yield is an important measure of the efficiency of a chemical reaction and indicates the success of the reaction in converting reactants into products.

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The precipitate is collected, filtered, dried, and weighed.. The mass of the precipitate is 0.116 g.

Dissolved refers to a solute that is completely dissolved in a solvent, resulting in a homogeneous mixture. When a solute, such as a salt, is dissolved in a solvent, such as water, the molecules of each component are dispersed evenly throughout the mixture. This process can be reversed by evaporating the solvent, leaving the solute behind. The amount of solute that can be dissolved in a particular solvent is known as its solubility.

Mass of Al2(SO4)3= Mass of sample- Mass of precipitate
Mass of Al2(SO4)3= 1.68-0.116=1.564 g
Percent of Al2(SO4)3= (1.564/1.68)*100= 93.45 %

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Answer:

A double displacement reaction is a type of reaction in which two reactants exchange ions to form two new compounds. Double displacement reactions typically result in the formation of a product that is a precipitate

Explanation:

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Answer: The baking of a pizza should be categorized as an endothermic process because the dough absorbs heat. An endothermic process is a method that absorbs energy from its surroundings which is habitually in the form of energy

Explanation:

Answer:

endothermic; the dough absorbs heat

Explanation:

EDG2020

The action of hydrochloric acid in the stomach on protein results in denaturation.

The action of hydrochloric acid (HCl) in the stomach on protein results in denaturation. Hydrochloric acid in the stomach helps break down food by dissolving nutrients and killing bacteria. It is mainly responsible for the conversion of pepsinogen to pepsin which is responsible for the breakdown of proteins.

In the presence of HCl, the protein in food is denatured. HCl is important for the digestive process as it creates an acidic environment that is necessary for the activation of digestive enzymes. Denaturation is a process by which the structure of a protein is altered due to exposure to certain external factors like heat, acid, and alcohol.

Denaturation results in a loss of protein function as the protein loses its three-dimensional shape. Denaturation is an irreversible process that affects the protein structure and function and cannot be reversed. Hence, the action of hydrochloric acid in the stomach on protein results in denaturation. 

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The volume (ml) of HCl solution at pH 1.52 that can be neutralized with a given amount of CaCO₃ is 17.87 mL

We want to determine the volume of HCl that can be neutralized with a given amount of CaCO₃.

First we will write the chemical equation for the reaction i.e.

2HCl + CaCO₃ → CaCl2 + CO2 + H2O

This means that now 1 mole of CaCO₃, 2 moles of HCl are needed to neutralize.

Mass = 27.0 mg = 0.027 g Using the formula,

mol = mass / molar mass

∴ CaCO₃ mol present =

CaCO₃ mol present = 0.00026977 mol

Since 2 mol HCl is required, 2 mol HCl 70 mol CaCO₃ must be neutralized 20. of CaCO₃ 444 0.00053954 mol HCl

∴ CaCO₃ needs to be neutralized 0.00053954 mol HCl Now for the volume of HCl solution at pH 1.

52 required.

We will first determine the HCl concentration = 10^(-1.52)

[H⁺] = 0.

0302 M

∴ HCl concentration 0.0302 M

Now, for the volume using the formula,

Volume = mol/concentration

Required HCl Volume = 0.01787 L

Hence, the volume in milliliters (mL) of an HCl solution with a pH of 1.52 that can be neutralized by the given CaCO₃ is 17.87 mL.

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\((40.0)(7.426)=\boxed{297.0 \text{ g (to 4 sf)}}\)

The space filling model shows all the atoms that are  involved while the ball and stick model shows the inter connecting bonds in the compound.

The space filling model and the ball-and-stick model are two commonly used representations of molecules in chemistry.

The ball-and-stick model represents the atoms of a molecule as balls and the chemical bonds between them as sticks. The size of the balls and the length of the sticks are proportional to the size of the atoms and the length of the bonds, respectively. This model gives a good idea of the relative positions of the atoms in the molecule and the angles between the bonds, but it does not show the relative sizes of the atoms or the amount of empty space between them.

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Answer:

Potassium (K)

Explanation:

Out of the four options, Potassium is the only one to fill a total of 4 energy levels.

Both Cesium (Cs) and Rubidium (Rb) fill more than three energy levels, with Cesium filling 6 and Rubidium filling 5.

Sodium (Na) only fills 3 energy levels.

Thus, that leaves Potassium (K), which has 4 energy levels.

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the final volume of air in the balloon  when the balloon is taken to a depth of 10ft in a swimming pool, where the pressure is 981 torr is 10.8 L. Answer: d) 10.8 L.

We are given the initial volume of air in the balloon, Vi = 14.0 L. The initial pressure, Pi = 760 torr. The final pressure, Pf = 981 torr. The depth of the swimming pool, h = 10 ft. The temperature of the air, T is constant, which means that the gas in the balloon is an ideal gas.

We can use Boyle's law and the pressure difference to find the final volume of air.Boyle's law states that at a constant temperature, the volume of a gas is inversely proportional to its pressure. That is,V_1/P_1 = V_2/P_2where V1 and P1 are the initial volume and pressure, and V2 and P2 are the final volume and pressure.

Rearranging this equation, we getV_2 = V_1 × P_1/P_2= 14.0 L × (760 torr)/(981 torr)= 10.8 L

Therefore, the final volume of air in the balloon is 10.8 L. Answer: d) 10.8 L.

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Answer:

Answer:

\(Mn(CH_{3} CO_{2} )_{2}\) is the first one

\(Au_{2} O\) is the second one

Explanation:

The roman numeral indicates the charge on the cation (the positively charged ion in the ionic compound, almost always a metal). So manganese (II) acetate tells us there will be a charge of 2+ on the Mg. Gold (I) oxide has a charge of 1+ on the Au.

When a ionic compound is formed, the total charge of the compound (the sum of the postive and negative charges) must equal zero.

Acetate is a polyatomic ion with a charge of 1-. This means there will need to be two of them to balance out the charge on the manganese.

Oxygen, when ionized, has a charge of 2-. This means there will need to be two gold atoms to balance out the negative charges.

If more acid was added to dissolve the excess magnesium, the calculated molar mass of the unknown copper compound would go down. This is because the additional acid would react with the magnesium to form magnesium ions.

That would dilute the concentration of copper ions in solution. As a result, less copper would precipitate out, and the calculated molar mass would be lower than the actual molar mass of the copper compound. The following equation shows the reaction between magnesium and hydrochloric acid:

Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)

The reaction produces magnesium chloride and hydrogen gas. The magnesium chloride will dissolve in the solution, while the hydrogen gas will escape into the air. This will reduce the concentration of copper ions in solution, and less copper will precipitate out.

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Answer:

fluorine

Explanation:

Electronegativity varies in a predictable way across the periodic table. Electronegativity increases from bottom to top in groups, and increases from left to right across periods. Thus, fluorine is the most electronegative element, while francium is one of the least electronegative

Answer:

See the answer below

Explanation:

When silver is added to dilute sulphuric acid, no reaction would occur. However, silver reacts with hot and concentrated sulphuric acid to produce silver sulphate, sulphur dioxide, and water.

The equation of the reaction is as below:

silver + sulphuric acid --> silver sulphate + water + sulphur dioxide

\(2Ag(s) + 2 H_2SO_4(aq) -->Ag_2SO_4 (s) + 2 H_2O (l) + SO_2 (aq)\)

In the following reaction , H₂O is acting as a base . H₂0 is the base in the forward reaction , because it accepts a proton, and becomes H₃O⁺.

Option A is correct .

                    H₂O + H₂SO₄ →  H₃O +  HSO₄⁻

H₂SO₄/HSO₄⁻ is an acid/conjugate base pair. . H₂0/H₃O⁺ is a base/conjugate acid pair. The acid and base are the reactants in the forward reaction.

When compared to the acid that gave rise to it, a conjugate base has one fewer H atom and one more charge. After acid loses its hydrogen ion, it is a residue. The more grounded a corrosive, the more fragile its form base, and, on the other hand, the more grounded a base, the more vulnerable its form corrosive.

The Bronsted-Lowry definition of acids and bases centers on the formation of conjugate acids and bases. The conjugate acid is the species formed when the base accepts the proton, and the conjugate base is the ion or molecule that remains after the acid has lost its proton.

Incomplete question:

according to the following reaction, which molecule is acting as a base?

    H₂O + H₂SO₄ →  H₃O +  HSO₄⁻

A. H₂O

B.  H₂SO₄

C.  H₃O

D.  HSO₄⁻

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The value of Kp for the given reaction N2O4(g) ⇌ 2NO2(g) is 1.47x10^-3 atm. To calculate Kp for the reaction N2O4(g) ⇌ 2NO2(g) using the given Kc value, we need to consider the relationship between Kp and Kc.

Kp is the equilibrium constant expressed in terms of partial pressures, while Kc is the equilibrium constant expressed in terms of concentrations. The relationship between them is Kp = Kc(RT)^Δn, where R is the gas constant, T is the temperature in Kelvin, and Δn represents the difference in the number of moles of gaseous products and reactants.

For the reaction N2O4(g) ⇌ 2NO2(g), the stoichiometric coefficients indicate that the change in the number of moles of gas is Δn = (2 - 1) = 1. Given the value of Kc as 5.9x10^-3, we can now calculate Kp. The value of R is 0.0821 L·atm/(mol·K), and let's assume the temperature is 298 K. Plugging in these values into the equation, we have Kp = (5.9x10^-3)(0.0821 L·atm/(mol·K))(298 K)^1 = 1.47x10^-3 atm.

Therefore, the value of Kp for the given reaction N2O4(g) ⇌ 2NO2(g) is 1.47x10^-3 atm.

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Fluorescein is a fluorescent dye that appears orange in acetone and nearly colorless in ether due to differences in their polarity and solvation. Acetone is a polar solvent with a high dielectric constant, whereas ether is a less polar solvent with a lower dielectric constant.

In a polar solvent like acetone, fluorescein molecules form strong intermolecular interactions, stabilizing the excited state of the dye and increasing the absorption and fluorescence intensity.

This results in the orange color observed. Conversely, in a less polar solvent like ether, there are weaker intermolecular interactions between the fluorescein molecules, leading to a lower energy excited state and a reduced absorption and fluorescence intensity.

Consequently, fluorescein appears nearly colorless in ether.

In summary, the difference in color of fluorescein in acetone and ether is due to the varying solvent polarity and resulting solvation effects on the dye's excited state, influencing absorption and fluorescence intensity.

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The pressure in the burette if the atmospheric pressure in the room at that time was 765.0 torr is 915 torr

The pressure in the burette can be obtained by using the following formula:

Pressure of gas = Atmospheric presure + pressure due to height

With the above formula, we can determine the pressure in the burette. This is illustrated below:

Pressure in burette = Atmospheric presure + pressure due to height

Pressure in burette = 765.0 + 150

Pressure in burette = 915 torr

Thus, the pressure in burette is 915 torr

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Answer:

I'm sorry, but I don't see an equation in your question to provide a specific answer. However, I can answer your general question.

Nitrogen has one more proton than Carbon because it has one more positively charged particle (proton) in its nucleus. This difference in the number of protons determines the atomic number and identity of the element.

Protons can only come from the nucleus of another atom, through a nuclear reaction. In nature, nitrogen is usually created by nuclear fusion in stars, where lighter elements combine under high pressure and temperature to form heavier elements.

Regarding the second part of your question, without the specific equation you are referring to, I cannot determine the type of reaction depicted. There are many types of chemical reactions, including synthesis, decomposition, combustion, acid-base, and redox reactions, among others.

moles of atoms in 50 atoms of barium are 301.15 × 10^23

1 mole of substance = 6.023 x 10^23

so in 50 atoms of Ba = 50 × 6.023 × 10^23

= 301.15 × 10^23

Therefore, moles in 50 atoms of Ba is 301.15 × 10^23.

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Answer:

Hydrogen and Oxygen

Explanation:

The chemical equation for water is H20, meaning Hydrogen and 2 oxygen!

c) The rates of the forward and reverse reactions are equal. When the forward and reverse processes move ahead and backward at the same pace, with no discernible change in the system, this is referred to as dynamic equilibrium for reversible processes.

Dynamic equilibrium occurs when, given a reversible process, the rate of the forward reaction equals the rate of the reverse reaction. Although it appears that nothing is happening because the two rates are equal, the reaction is actually continuing at its steady rate. The equilibrium state is one in which there is no net change in the concentrations of reactants and products. The opposite is true; at equilibrium, both forward and reverse reactions proceed at the same rate, maintaining the net concentrations of reactants and products as is.

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