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The statement that describes a casual relationship between two variables would be a correlation.

Correlation is a statistical term used to describe the relationship between two variables. The strength of the correlation between two variables is measured by a factor known as the correlation coefficient. The correlation coefficient is represented by r.

The value of r ranges from -1 to +1.

Thus, the casual realtionship between two variables is best described as correlation.

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Answer:

The Percentage concentration of acetic acid = 1.39 %

Explanation:

Density of acetic acid solution = 1.05 g/mL

Volume of acetic acid solution = 0.1 L = 100 mL

From the formula, Density = mass / volume; mass = density × volume

Mass of acetic acid solution = 1.05 g/mL × 100 mL = 105 g

Molar concentration of acetic acid solution = 0.243 mol/L

Molar mass of acetic acid, CH₃COOH = (12 × 2 + 1 ×4 + 16 ×2) = 60 g/mol

From the formula, mass concentration = molar concentration × molar mass

Mass concentration of acetic acid, CH₃COOH = 0.243 mol/L × 60 g/mol = 14.58 g/L

In one liter of acetic acid solution, there are 14.58 g of acetic acid. Therefore, in 0.1 L, there will be 14.58 × 0.1 = 1.458 g of acetic acid.

Percentage concentration of acetic acid = mass of acetic acid / mass of acetic acid solution × 100%

Percentage concentration of acetic acid = (1.458 / 105) × 100% = 1.39 %

The Percentage concentration of acetic acid = 1.39 %

Their bonds are polar because every oxygen has a delta - and every carbon has a delta +. an element with the chemical symbol C and indeed the isotope 6 Tetravalent, nonmetallic, and it.

Metals are melted down using coke & charcoal, both of which are impure forms of carbon. It is especially important there in steel and aluminium industries. Graphite can be found in electric motor brushes, furnace linings, and pencil leads. Activated charcoal is used for filtering and purification.

poisonous nature of carbon. Thousands of fatalities occur each year in North America as a result of the odourless gas carbon monoxide. Inhaling carbon monoxide is exceedingly dangerous. It is the main cause of poisoning deaths in the country.

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Answer:

El nivel de líquido subirá más al introducirse el objeto de 70 g.

Explanation:

El nivel de líquido subirá más con el objeto que tenga mayor volumen.

Por lo tanto vamos a calcular el volumen de ambos objetos, usando la definición de densidad:

Si despejamos Volumen:

Ahora usamos esa ecuación y calculamos los volúmenes:

Por lo tanto el nivel de líquido subirá más con el segundo objeto.

The expected color of the starch complex formed during this experiment is b. blue.

The color of the starch complex formed during an experiment depends on the reagent used. The iodine reagent is used to detect the presence of starch. The color of the starch complex with iodine reagent is blue-black. This blue-black color is because the iodine molecules enter the helix structure of the starch molecules and forms an iodine-starch complex.

Iodine is a useful reagent for detecting starch because it changes color from yellow to blue-black when it interacts with the helix structure of starch molecules. When iodine reacts with the amylose helix, it forms a blue complex. The amylopectin complex produces a blue-black color in the presence of iodine. In both cases, iodine molecules are trapped within the helix structure of the starch molecule, resulting in a blue-black color.

The expected color of the starch complex formed during an experiment is blue-black. The intensity of the blue-black color depends on the concentration of the starch present in the solution. The more starch present in the solution, the more intense the blue-black color will be. If there is no starch present in the solution, then the iodine reagent will remain yellow in color. Therefore, blue-black is the expected color of the starch complex formed during this experiment.

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Answer:

When an object is heated up, its particles gain more kinetic energy and hence its internal energy increases. A change in state will also result in a change in internal energy.

When an object cools down, heat is withdrawn from it. Hence, the entropy of the object decreases. But the decrease in entropy leads to the transfer of energy to the surrounding.

I hope this helps you! Good luck with school! :D

Answer:

Explanation:

When an object is heated up, its particles gain more kinetic energy and hence its internal energy increases. A change in state will also result in a change in internal energy.

When an object cools down, heat is withdrawn from it. Hence, the entropy of the object decreases. But the decrease in entropy leads to the transfer of energy to the surrounding.

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1. The limiting reagent is sulfur trioxide, SO₃ and the excess reagent is water, H₂O

2. The mass of the excess reagent leftover is 14.92 g

3. The mass of sulfuric acid, H₂SO₄ is produced is 8.06 g

The limiting and excess reagent can be obtained as follow:

SO₃ + H₂O -> H₂SO₄

From the balanced equation above,

80 g of SO₃ reacted with 18 g of H₂O

Therefore,

6.58 g of SO₃ will react with = (6.58 × 18) / 80 = 1.48 g of H₂O

From the above calculation, we can see that only 1.48 g of H₂O out of 16.4 g is needed to react completely with 6.58 g SO₃.

Thus, the limiting reagent is SO₃ and the excess reagent is H₂O

The mass of the excess reagent leftover can be obtained as follow:

Mass of excess reagent, H₂O leftover = Mass given - mass reacted

Mass of excess reagent, H₂O leftover = 16.4 - 1.48

Mass of excess reagent, H₂O leftover = 14.92 g

The mass of H₂SO₄ produced can be obtained as illustrated below:

SO₃ + H₂O -> H₂SO₄

From the balanced equation above,

80 g of SO₃ reacted to produce 98 g of H₂SO₄

Therefore,

6.58 g of SO₃ will react to produce = (6.58 × 98) / 80 = 8.06 g of H₂SO₄

Thus, the mass of H₂SO₄ produced is 8.06 g

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Due to its tiny size and high charge, lithium ion is most likely to combine with OH- to produce a soluble ionic molecule. Although they have a lower solubility, Ag+, Pb2+, Ni2+, and Zn2+ can also form ionic compounds.

With potassium cation  and hydroxide anion , the +1 charge already counterbalances the -1 charge, without the need for additional cations or anions. This indicates that to create a neutral chemical with the formula , one unit of each ion must be added.

When naming binary ionic compounds, the nonmetal anion (element stem + -ide) comes after the cation (specifying the charge, if necessary). Without employing prefixes, it is possible to tell from the compound name how many of each element are present.

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Answer:

I think that it is A I am sorry if I am wrong

Explanation:

Octane has a density of 0.692 g/ml at 20°C. Grams of O₂ required to burn 15.0 gal of C₈H₁₈ is 1.37868×10⁵g.

Octane is a hydrocarbon having eight carbon atoms and have single bonds only.

Given,

Density of octane = 0.692g/ml

Temperature = 20°C = 293K

Amount of Octane present = 15gal

Molar mass of octane = 114g

We know that,

1 gal = 3.78541L = 3785.4ml

Hence, 15 gal = 56781 ml

Now let's calculate the Mass of octane required:

Mass of octane = 0.692 x 56781

Mass of octane = 39292.45 g

According to the given equation,

C₈H₁₈ + 12.5O₂ ---------> 8CO₂ + 9H₂O

Also, 114g of octane needs-------> 400g of oxygen

39292.45g of octane needs ---------> 137868.24g of oxygen

Hence, oxygen needed to burn octane is 1.37868×10⁵g

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Answer:

50 m/s^2

Explanation:

In this case, we're using Newton's Second Law: Force = mass × acceleration.

We are given the force as 250 newtons and the mass as 50 kg, so 250/50 = 50 m/s^2.

Have a lovely rest of your day/night, and good luck with your assignments! ♡

The acceleration is the ratio of the force applied to an object to the mass. A 50 kg rocket with a force of 250 newtons has an acceleration of 50 m/s².

Newton's second law states about a motion depicts the relationship between mass, acceleration, and force. The motion experienced by an object will be more if the force applied is more.

It is a quantitative description that relates the acceleration experienced by the body due to the applied force. It is given as,

F = m × a

Given,

Mass of water rocket (m) = 50 Kg

Force (F) = 250 N

Substituting values above:

250 N = 50 × a

a = 250 ÷ 50

= 50 m/s²

Therefore, the water rocket weighing 50 kg with a force of 250 N experiences an acceleration of 50 m/s².

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            Precipitate definition (Entry 2 of 3) 1: a substance that has been physically or chemically isolated from a solution or suspension, typically in the form of an insoluble crystalline or amorphous solid. 2: a byproduct, outcome, or result of a procedure or action. adjective. precipitate.

Precipitation Illustration

        Silver chloride will solidify out of solution when silver nitrate and sodium chloride are combined in water. Silver chloride is the precipitate in this instance.

       Solids are created by the process of precipitation after two chemicals react. The downword () arrow symbol is used to represent the production of precipitate in this type of reaction.

      It happens between the reactant ions in the aqueous solutions that give rise to the material. Complete response: Precipitation includes the following: snow, sleet, hail, and rain.

       An excess of the light blue precipitate dissolves to create an inky transparent solution. A little amount of sodium hydroxide solution and subsequently an excessive amount are added to solution W. There develops an insoluble white precipitate.

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Answer: Cr2NiO7 is the molecular formula for nickel II dichromate.

The bromophenol blue solution will become more yellow as a result of the addition of an acid, which will tilt the balance in favor of the acidic side.

The bromophenol blue solution will become more blue as a result of the addition of a base, which will shift the equilibrium toward the basic side.

Bromophenol blue is a pH indicator that undergoes a color change depending on the acidity or basicity of the solution. It appears yellow in acidic conditions (pH below 3), green at neutral pH (around 6), and blue in basic conditions (pH above 8).

We can forecast the results of adding an acid or a base to a solution containing bromophenol blue by using Le Chatelier's principle, which states that a system in equilibrium will respond to a disturbance by moving in a direction that minimizes the influence of the disturbance.

A solution can become more acidic by the addition of an acid, which raises the concentration of H⁺ ions in the solution. Le Chatelier's principle states that the system will change in a way that lessens the impact of the disturbance. To lessen the surplus H⁺ ions, the equilibrium will change to the acidic side. The bromophenol blue solution will subsequently become more yellow, suggesting a rise in acidity.

Addition of a base: Adding a base to a solution makes it more basic by raising the concentration of OH⁻ ions in the solution. Le Chatelier's principle states once more that the system will change in a way that lessens the impact of the disturbance. To lessen the surplus OH- ions, the equilibrium will change to the basic side. As a result, the solution of bromophenol blue will darken more, indicating a rise in basicity.

To sum up:

The bromophenol blue solution will become more yellow as a result of the addition of an acid, which will tilt the balance in favor of the acidic side.

The bromophenol blue solution will become more blue as a result of the addition of a base, which will shift the equilibrium toward the basic side.

These forecasts are based on the idea that the equilibrium will change in a way that offsets reaction the disturbance brought on by the addition of acid or base, maintaining balance in the process.

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Answer:

It is a force of attraction that holds the atoms/ions with each other to form a molecule or between the molecules to form a substance.

Explanation:

The chemical bond can be thought of as a force that holds the atoms of various elements together in such compounds.

It takes so much heat to melt ice or evaporate water because extra energy is required to break the hydrogen bonds between water molecules.

Hydrogen bonding is an electrostatic force of attraction between a hydrogen atom found between a pair of other atoms having a high affinity for electrons.

Hydrogen bonds cause water to be exceptionally attracted to each other creating cohesion.

It takes so much heat to melt ice or evaporate water because extra energy is required to break the hydrogen bonds between water molecules.

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Answer:

d. The particles of matter are arranged

in different ways for the different

states.

Explanation:

when you hear kinetic think hot or cold

example

water when its hot its a gas and looks different under a microscope

water when its cold its ice and looks different under a microscope

Approximately 24.55 cm^3 of oxalic acid must be added to sufficient water to give a 1.500 liter solution with a formal concentration of 0.300 F.

To find the volume of oxalic acid needed to make a 1.500 liter solution with a formal concentration of 0.300 F, we need to use the equation:

Formal concentration (F) = (moles of solute) / (volume of solution in liters)

First, we need to calculate the moles of oxalic acid required. The formal concentration (F) is given as 0.300, so:

0.300 = (moles of oxalic acid) / 1.500

Rearranging the equation, we find:

moles of oxalic acid = 0.300 * 1.500

moles of oxalic acid = 0.450

Next, we can calculate the mass of oxalic acid needed using its molecular mass:

mass of oxalic acid = moles of oxalic acid * molecular mass

mass of oxalic acid = 0.450 * 90.03

mass of oxalic acid = 40.5145 g

Finally, we can calculate the volume of oxalic acid needed using its density:

volume of oxalic acid = mass of oxalic acid / density

volume of oxalic acid = 40.5145 g / 1.65 g/cm^3

volume of oxalic acid = 24.55 cm^3

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Answer:

Cells are uncountable becasue they move around your body, make up your skin and other organs as well. And because when you grow, the cells multiply, and that makes it very hard for scientists to count cells in a human's body.

Explanation:

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The total pressure of the gas is calculated as 849 mmHg.

The term partial pressure is the pressure that is exerted by an individual gas in a mixture of gases.

In this case, the partial pressures of hydrogen and water are 789 mmHg and  60 mmHg respectively.

Thus, the total pressure of the gas =  60 mmHg +  789 mmHg = 849 mmHg.

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Answer:

3.45*10^-29

Explanation:

E=hv

h is Planck's constant and v is the frequency (which was given to us)

E=6.626*10^-34 * 5.21*10^4

E=3.452146*10^-29

To find the amount of energy required to melt a 23.9 g sample of solid chromium at its normal melting point, we can use the following formula:

where:

First, we need to convert the mass of chromium into moles: moles of Cr = (23.9 g) / (51.996 g/mol) = 0.4599 moles Now, we can use the formula to find the energy required:

Solid chromium is a hard, lustrous metal that has a high melting point and is resistant to corrosion. Chromium is used in a variety of industrial applications, such as stainless steel, catalysts and pigments. Chromium is also an essential element for human and animal health.

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Answer:

Law of Conservation of Mass

Explanation:

Balancing chemical equation means that the amount of moles of one atom on side must match the other, which makes sure that no atoms are created nor destroyed in the reaction process.

The molality of chloride ions is 4.63kg/L

Data;

Mole Fraction of MgCl2 = 0.04

The sum of mole fraction = 1

Mole fraction of water = 1 - 0.04 = 0.96

since the total number of moles = 1

Number of moles of MgCl2 = mole fraction * total number of moles

Number of moles of MgCl2

\(0.04 * 1 = 0.04 moles\)

Number of moles of water =

\(0.96 * 1 = 0.96 moles\)

1 moles of MgCl2 = 2 moles of Chloride ions

Number of moles of chloride ions

\(2 * 0.04 = 0.08 moles\)

Number of moles of water = 0.96moles

mass of water = molecular weight * number of moles

mass of water =

\(18 * 0.96 = 17.28g\)

let's convert this to kilogram

\(1000g = 1kg\\17.28g = x\\x = 0.01728kg\\\)

The molality of the ions in the solution is

\(M = \frac{mass of solute}{volume of solution} \\M = \frac{0.08}{0.01728} =4.63 kg/L\)

The molality of chloride ions is 4.63kg/L

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I feel confident about modeling how the energy in a reaction will change, because this unit provided me with the information necessary to determine the type. With this knowledge, I can now interrelate with other properties and believe that this new ability will assist in future units as well. This unit has encouraged a deeper understanding of the world and its guiding principles.

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The boiling point and freezing point 0.10 m NaCl are both giver than those of 0.10 m and the correct option is option B.

Although the concentrations of the two solutions are the same, the electrolyte NaCl dissociates into two ions (Na+ and Cl-) while the non-electrolyte glucose stays as 1 particle.

Boiling point elevation and freezing point depression is higher with more dissolved solute particles, so 0.10 m NaCl would have more boiling point and freezing point as compared with that of glucose.

Thus, the ideal selection is option B.

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Answer:

The equation H2 + O2 indicates that there are two atoms of hydrogen on the reactant side.