Carter pushes a bag full of basketball jerseys across the gym floor. Then he pushes with a constant force of 21 newtons. If he pushes the bag 9 meters in 3 seconds, how much power does he use? (Hint: 1 watt = 1 .)
A.
3 watts
B.
7 watts
C.
27 watts
D.
63 watts
E.
189 watts

Answer: 0.75 L

Explanation:

First, calculate the number of moles of AgNO3 in 1.0 L of 0.20 M solution:

\(0.20 mol/L x 1.0 L = 0.20 mol\)

Since the stoichiometric ratio of AgNO3 to CaCl2 is 2:1, we need 0.10 mol of CaCl2 to completely precipitate the Ag+ in the solution.

Next, we can use the molarity and the number of moles of CaCl2 to calculate the volume of 1.5 M CaCl2 needed:

\(0.10 mol / 1.5 mol/L = 0.067 L or 67 mL\)

However, we are asked to round to two significant figures, so the final answer is 0.75 L.

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The reaction rate for a dimethyl sulfide at 20cm3 after 5 minutes is 2 cm3/min.

To calculate the reaction rate, we need to know the change in concentration of the reactant over time. In this case, we know that the initial volume of the dimethyl sulfide was 20 cm3, and after 5 minutes, it had reduced to 10 cm3. We can use this information to calculate the change in concentration over time.

Initial volume of dimethyl sulfide (V1) = 20 cm3

Final volume of dimethyl sulfide (V2) = 10 cm3

Time taken for the reaction (t) = 5 minutes

The reaction rate (r) can be calculated using the formula,

r = (V1 - V2) / t

Substituting the given values,

r = (20 cm3 - 10 cm3) / 5 min

r = 2 cm3/min

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--The complete question is, Calculate the reaction rate for a dimethyl sulfide at 20cm3 after 5 minutes and reaches till 10 cm3.--

The combination of beads should the student use for  the model :2 green, 3 blue and 12 yellow

In the chemical formula of a compound there are numbers:

1. The number indicates the number of atoms written after the element symbol

2. The number after the parentheses represents the number multiplied by the number of atoms in parentheses.

3. The number before the chemical formula shows the number of molecules behind it, which is usually used in equations

To calculate the beads needed to make a model, we must count the number of atoms of the Al₂(SO₄)₃ molecule

In the Al₂ (SO₄) ₃ molecule there are 3 atoms : Al, S, and O

So the combination of beads

2 green(for Al), 3 blue(for S) and 12 yellow(for O)

Answer:

2 blue, 3 yellow, and 12 green

Explanation:

Answer:

the answer is is C 465 grams

A 2 g sample of \(CoCl_{2} .xH_{2} O\) is dried in the oven when the anhydrous salt is removed from the oven its mass is 1.565 g then the value of x is 0.024  .

Calculation ,

mass =  2 g ( given )

molar mass = 134.45 + x × 18

After dehydration or when the anhydrous salt is removed from the oven  mass remain = 1.565 g

Molar mass = 134.45

Thus mass of \(H_{2} O\) = 2 g - 1.565 g = 0.435 g

Number of moles of water =  0.435 g / 18  = 0.024 moles

Therefore value of x = 0.024

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Answer:

it's harmful

Explanation:

it's harmful to our environment it can endanger our planet and endangered animal species it can also kill lots of plants and we have a hard time burning fossil fuels with limited factories which costs a lot of money.

An ionic compound's name and formula always place the cation before the anion.

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The molecule is polar if the configuration is asymmetrical.

A physical characteristic of compounds called polarity links other characteristics including solubility, melting and boiling points, and intermolecular interactions.

Molecules that have both positive and negative charge areas are said to be polar. A polar substance is water, for instance. Due to the sort of bonds it has and the way it is shaped, the molecule has a slight positive charge at the hydrogen end and a slight negative charge at the other end (the oxygen end).

We may tell that a bond is polar if the difference in electronegativity between its constituent atoms is between 0.5 and 2.0. If the atom is a diatomic, a polar molecule must follow.

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Answer: c

Explanation: built different

A) All of the following enforce municipal securities industry rules EXCEPT Office of the Comptroller of the Currency.

The Office of the Comptroller of the Currency (OCC) primarily regulates and supervises national banks and federal savings associations. While it plays a crucial role in overseeing the banking system, it is not directly responsible for enforcing municipal securities industry rules. On the other hand, the other options listed—MSRB (Municipal Securities Rulemaking Board), FINRA (Financial Industry Regulatory Authority), and SEC (Securities and Exchange Commission)—are all involved in regulating and enforcing rules related to municipal securities.  The MSRB is a self-regulatory organization that creates rules and regulations for broker-dealers and banks engaged in the municipal securities market. FINRA is another self-regulatory organization that oversees brokerage firms and their registered representatives, including those involved in municipal securities transactions. The SEC, as the primary regulatory body for the securities industry, has the authority to enforce rules and regulations related to municipal securities to protect investors and ensure fair and transparent markets.

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a) Melting: An example of melting that occurs in our everyday life is when we heat butter on a stovetop.

b) Freezing: Freezing is the process in which a liquid transforms into a solid upon cooling.

c) Condensation: One example of condensation that we encounter regularly is when water droplets form on the surface of a cold drink on a hot day.

d) Evaporation: Evaporation is the process by which a liquid transforms into a gas or vapor.

e) Sublimation: Sublimation refers to the transformation of a substance directly from a solid to a gas without passing through the liquid state.

a) Melting:  Butter is a solid at room temperature, but when heat is applied, it melts into a liquid. This change is a result of the increase in temperature, which provides enough energy to overcome the intermolecular forces holding the butter molecules together.

b) Freezing:Eventually, the temperature reaches the freezing point of water (0°C or 32°F), at which the water molecules slow down and arrange themselves into a regular, crystalline structure. This transformation from a liquid to a solid state is accompanied by the release of heat energy.

c) Condensation: As the temperature decreases, the air's capacity to hold moisture decreases, causing the water vapor in the air to condense into liquid water droplets. This process occurs due to the transfer of heat energy from the warm air to the cold surface, leading to the saturation of the air and the conversion of water vapor into liquid form.

d) Evaporation:  As the sun's heat energy is absorbed by the water molecules on the clothes' surface, their kinetic energy increases, causing them to break free from the liquid phase and escape into the surrounding air as water vapor. This process occurs because the molecules at the liquid surface with sufficient energy can overcome the attractive forces within the liquid and enter the gas phase.

e) Sublimation: Sublimation refers to the transformation of a substance directly from a solid to a gas without passing through the liquid state. An example of sublimation is the process of dry ice (solid carbon dioxide) converting into carbon dioxide gas.

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Answer:

The shapes and lines they hold within the rock. Rocks can simply be regenerated and melted back into a new and different form. Lines and texture usually prove how old the rocks are.

Explanation:

I hope this helps and I'm sorry if it's wrong! <3

Answer:

Chemistry has taught that ;

Unsaturated hydrocarbon molecules that contain one or more double bonds are called alkenes.

Alkynes are  unsaturated hydrocarbons due to the fact that some of the carbons are connected to fewer than four neighbouring atoms.

Note : Alkenes contain at least one double bond, while alkynes contain at least one triple bond.

Explanation:

I think the answer is A. I know it's Planet X.

Answer:

propyl

1-propylmethane or 2-methylpropane

Answer:

hey here is the answer to your question.

Explanation:

1) Write a balanced equation for the reaction occurring. (*Iron occurs in a few different oxidation states, but I will assume we're referring to Fe(II) or Fe2+)

Fe + CuSO4 -> Cu + FeSO4

2) Calculate the number of moles of each reactant.

Fe: 1.924 g * (1 mol / 55.85 g) = 0.03455 mol Fe

CuSO4: 0.1363 L * (0.0750 mol / 1 L) = 0.01022 mol CuSO4

3) Determine the limiting reactant. Because we have fewer moles of copper(II) sulfate and are reacting both reactants in a 1:1 ratio, we will run out of copper(II) sulfate first, making it the limiting reactant.

4) Convert moles of the limiting reactant to moles and grams of product of interest.

0.01022 CuSO4 (1 mol Cu / 1 mol CuSO4 ) (63.55 g Cu / 1 mol Cu) = 0.6495 g Cu

Answer:

A) 24g soluto y 376g solvente.

B) 16.8g soluto y 39.2g solvente

C) 45g soluto y 405g solvente

D) 10g soluto y 190g solvente

E) 90mL soluto y 360mL solvente

F) 245mL soluto y 735mL solvente

G) 15mL soluto y 35mL solvente

Explanation:

El porcentaje masa/masa (% m/m) se define como la masa de soluto presente en 100g de solución (Soluto + solvente).

De la misma manera, el porcentaje volumen/volumen se define como el volumen de soluto en 100mL de solución:

A) 400 gramos de disolución al 6 % m/m.

400g solución * (6g soluto / 100g solución) = 24g soluto

400g solución - 24g soluto = 376g solvente

b) 56 gramos de disolución al 30 % m/m.

56 gramos de disolución al 30% m/m.

56g solución * (30g soluto / 100g solución) = 16.8g soluto

56g solución - 16.8g soluto = 39.2g solvente

c) 450 gramos de disolución al 10 % m/m

450 gramos de disolución al 10% m/m.

450g solución * (10g soluto / 100g solución) = 45g soluto

450g solución - 45g soluto = 405g solvente

d) 200 gramos de disolución al 5 % m/m

200 gramos de disolución al 5% m/m.

200g solución * (5g soluto / 100g solución) = 10g soluto

200g solución - 10g soluto = 190g solvente

e) 450 mL de disolución al 20 % v/v

450 mL de disolución al 20% m/m.

450 mL * (20mL soluto / 100mL solución) = 90mL soluto

450mL solución - 90mL soluto = 360mL solvente

f) 980 mL de disolución al 25 % v/v

980 mL de disolución al 25% m/m.

980 mL * (25mL soluto / 100mL solución) = 245mL soluto

980mL solución - 245mL soluto = 735mL solvente

g) 50 mL de disolución al 30 % v/v

50 mL de disolución al 30% m/m.

50 mL * (30mL soluto / 100mL solución) = 15mL soluto

50mL solución - 15mL soluto = 35mL solvente

Changes in the independent variable lead to changes in the dependent variable during an experiment.

The dependent and independent variable

In experiments, two variables are necessary to derive the cause of one factor over the other. These are the independent and dependent variables.

The independent variable can be altered, manipulated and changed in an experimental study.

The effect of such manipulation is observed on another variable which is the dependent variable.

The dependent variable when changes such a change can be recorded to derive the outcome of the experiment.

Hence changes in the independent variable lead to changes in the dependent variable during an experiment.

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Explanation:

Your results would be effected because there is a possibility that the water and chemical substance added into the flask will combine, possibly creating a reaction, either making the solution stronger or weaker, or possibly just messing up your experiment in one go.

For example:

If I paint a picture, and I have a cup that I use in order to put paint in, but the cup is wet and I put my paint in it, my paint will become more liquefied due to the fact water has been added to it, messing the paint up.

The value of Ka for this unknown acid is 3.65 x 10^(-6).

To find the value of Ka for the unknown acid, we first need to understand what is meant by "one half the equivalence point" in an acid-base titration.

The equivalence point is the point at which the acid and base have reacted completely and are in stoichiometrically equivalent amounts. At this point, the pH will be equal to the pKa of the acid (for a weak acid-strong base titration) or pKb of the base (for a weak base-strong acid titration).

"One half the equivalence point" refers to the point at which exactly half of the acid has been neutralized by the base. At this point, the moles of acid remaining is equal to the moles of base added, so we can use the Henderson-Hasselbalch equation to find the pKa of the acid.

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

At one half the equivalence point, [A-] = [HA], so we can simplify the equation to:

pH = pKa + log(1)

pH = pKa

Therefore, at one half the equivalence point, the pH is equal to the pKa of the acid. In this case, the pH is 5.46.

To find the value of Ka, we can use the equation:

Ka = 10^(-pKa)

Substituting in the pH of 5.46:

Ka = 10^(-5.46)

Ka = 3.65 x 10^(-6)

Therefore, the value of Ka for this unknown acid is 3.65 x 10^(-6).

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An electron cannot have the quantum numbers n= 1, l= 1, ml =1. Hence, the correct option is (D).

Quantum numbers are the set of numbers used to express the location and energy of an electron in an atom. The four categories of quantum numbers are primary, azimuthal, magnetic, and spin quantum numbers.

Quantum numbers are quantities that represent an electron's energy or energetic state. The numbers represent the spin, energy, magnetic moment, and angular moment of an electron.

The primary energy level that the electron occupies is represented by the fundamental quantum number or n. Energy levels are predetermined distances from an atom's nucleus. They are described in increments of whole numbers.

Any two electrons cannot have all the same quantum numbers.

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The complete question is:

"An electron cannot have the quantum numbers n = ________, l = ________, ml = ________.

A) 2,0,0

B) 2,1,-1

C) 3,1,-1

D) 1,1,1

E) 3,2,1

Answer:

False

Explanation:

Ionic bonds are actually strong, but unfortunately can be broken easily

Answer:

The post-transition metals cluster to the lower left of this line. Metalloids: The metalloids are boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te) and polonium (Po). They form the staircase that represents the gradual transition from metals to nonmetals.

Explanation: i googled it

The metal that is grouped with metalloids are

A metalloid is a type of element which possesses the characteristics of both the metals and the non-metals.

Metals are those elements that are good conductors of heat and electricity while non-metals are those elements that neither conducts heat nor electricity.

The characteristics of the metalloids listed above are:

Therefore, since these elements share both the properties of metals and non-metals, they are called the metalloids.

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The solubility of BaF₂ will be significantly affected by a change in pH. Option A is correct.

BaF₂ is an ionic compound that is sparingly soluble in water. When it dissolves in water, it undergoes hydrolysis to form hydrofluoric acid (HF) and a basic salt (Ba(OH)₂). The pH of the solution will therefore be determined by the relative concentrations of HF and Ba(OH)₂. As the pH of the solution changes, the equilibrium between BaF₂, HF, and Ba(OH)₂ will shift, leading to a change in the solubility of BaF₂.

In contrast, BaCl₂, BaBr₂, and BaI₂ are also ionic compounds that are soluble in water but do not undergo hydrolysis to any significant extent. Therefore, their solubilities are not significantly affected by changes in pH.

Hence, A. BaF₂ is the correct option.

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Answer: Science and Mathematics- Anthropologist, Meteorologist

Engineering and technology- Fuel Cell Technician, Computer programmer, electrical Drafter, Civil Drafter

Answer:

i have the same question  

Explanation:math and science is the meteorologs and the  anthropologist

The pH of a solution is a measure of the acidity or basicity of the solution. It is defined as the negative logarithm of the hydrogen ion (H+) concentration in the solution. Therefore, the pH of the solution is 3.91.  

To determine the pH of a solution containing potassium acetate and acetic acid, we need to know the concentrations of the two solutes and the ratio of acetic acid to potassium acetate in the solution.

We are given the concentration of the potassium acetate and the ratio of acetic acid to potassium acetate in the solution. To calculate the pH of the solution, we can use the following equation:

pH = -log[H+]

where [H+] is the concentration of hydrogen ions in the solution.

To find the concentration of hydrogen ions in the solution, we can use the following equation:

[H+] = [acetic acid] + [potassium acetate] * ([acetic acid]/[potassium acetate])

Substituting the values we have, we get:

[H+] = (6.84 x \(10^{-2\)) + (0.434 x 6.84 x  \(10^{-2\)) * (0.00072)

[H+] = 6.84 x  \(10^{-2\) + 2.69 x  \(10^{-2\)

[H+] = 9.53 x  \(10^{-2\) mol/L

The pH of the solution can be calculated using the equation:

pH = -log[H+]

Substituting the value of [H+] in the equation, we get:

pH = -log[9.53 x \(10^{-2\)]

pH = 3.91

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There is no element that is exclusively found only in the human body. Elements found in the human body are also present in various forms throughout the Earth's crust, atmosphere, and other living organisms. However, there are elements that are essential for human life and play crucial roles in our body's biological processes.

Some key elements found in the human body include oxygen (O), carbon (C), hydrogen (H), and nitrogen (N). These elements make up a large percentage of our body's composition and are the building blocks for molecules like proteins, carbohydrates, and lipids. Other essential elements, such as calcium (Ca), phosphorus (P), potassium (K), sulfur (S), sodium (Na), chlorine (Cl), and magnesium (Mg) also play vital roles in maintaining our health and ensuring proper functioning of our cells.

In summary, while there isn't an element that is solely found in the human body, there are several elements that are crucial for our body's proper functioning and overall health. These elements can be found in various forms and quantities throughout the Earth and other living organisms as well.

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The empirical formula of the compound is CH₂

Mass of C = (12 / 44) × 3.14

Mass of C = 0.86 g

Mass of H = (2 / 18) × 1.29

Mass of H = 0.14 g

Divide by their molar mass

C = 0.86 / 12 = 0.07

H = 0.14 / 1 = 0.14

Divide by the smallest

C = 0.07 / 0.07 = 1

H = 0.14 / 0.07 = 2

Thus, the empirical formula of the compound is CH₂

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