Nora walks down a street and sees a girl bouncing a basketball. Nearby, an iron nail is attracted towards a magnet. Which statement is true about the ball and the nail? They both experience contact forces. The ball experiences a contact force and the nail experiences a non-contact force. They both experience non-contact forces. The ball experiences a non-contact force and the nail experiences a contact force. It's B I took the test.

a and e are heterogeneous (door and salsa), b, c, and d are homogeneous (air, black coffee, and pure water), and f cannot be classified as it pertains to a person rather than a substance or mixture. Option A and E

a. A door: Heterogeneous. A door is typically made up of various materials such as wood, metal, glass, etc. These materials have different properties and can be easily distinguished, making the door a heterogeneous object.

b. The air you breathe: Homogeneous. Air is a mixture of gases, primarily nitrogen, oxygen, carbon dioxide, and trace amounts of other gases. On a macroscopic scale, air appears uniform and consistent throughout, making it a homogeneous mixture.

c. A cup of coffee (black): Homogeneous. A cup of black coffee consists of water and coffee solutes that are evenly distributed throughout the liquid. It appears uniform and consistent, indicating a homogeneous mixture.

d. The water you drink: Homogeneous. Pure water, without any dissolved substances or impurities, is a homogeneous substance. It is composed of H2O molecules that are uniformly distributed throughout the liquid.

e. Salsa: Heterogeneous. Salsa is a mixture of various ingredients such as tomatoes, onions, peppers, and spices. These ingredients have different textures, colors, and sizes. The different components can be visually distinguished, making salsa a heterogeneous mixture.

f. Your lab partner: Heterogeneous. A lab partner refers to a person, and individuals are not considered homogeneous or heterogeneous in the same sense as substances or mixtures. They are complex beings with different physical characteristics, thoughts, and behaviors. Thus, categorizing a lab partner as homogeneous or heterogeneous is not applicable in this context. Option A and E

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The answer to this question is it allows for great diversity among the finches, allowing the population to survive even if there is an ecological change.

Charles Darwin is known as the inventor of the famous theory of evolution. Darwin's Theory of Evolution states that those with characteristics best suited to their environment are more likely to survive and reproduce. Individuals then pass on these desirable characteristics to their offspring.

Finches have beaks that specialize in eating insects. Charles Darwin realized that they all descended from a common ancestor. When they scattered to different islands. These birds have adapted to eat a wide variety of available foods. A long period of natural selection has produced 13 different species of finches.

The environment is a factor that may naturally manipulate the species. And the environment also causes the species to change over time.

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The smallest unit of matter that retains the properties and characteristics of an element is called an atom.

The concept of an atom was first introduced by the ancient Greeks, who believed that everything was composed of tiny, indivisible particles. Today, we know that atoms are made up of even smaller particles called protons, neutrons, and electrons, and that the number of each of these particles determines the element to which the atom belongs.

So, to put it simply, an atom is the basic building block of matter and is the smallest unit of an element that retains its unique properties and characteristics.

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Answer:

examples of intensive properties are colours and density

Answer:

Hydrogen

Explanation:

These are what hydrogen isotopes look like

The equilibria studied in the lab procedure include sodium chloride and potassium iodide.

Sodium chloride (NaCl) and potassium iodide (KI) are both ionic compounds that are soluble in water. When they are dissolved in water, they dissociate into their constituent ions.

NaCl dissociates into sodium ions (Na+) and chloride ions (Cl-), while KI dissociates into potassium ions (K+) and iodide ions (I-)

When solutions of NaCl and KI are mixed together, the following reaction takes place:

NaCl + KI → NaI + KCl

The products of this reaction are sodium iodide (NaI) and potassium chloride (KCl).

This reaction is a double displacement reaction, also known as a metathesis reaction, where the cations and anions of two different ionic compounds exchange places to form two new ionic compounds.

The reaction can also be represented using ionic equations:

Na+ (aq) + Cl- (aq) + K+ (aq) + I- (aq) → Na+ (aq) + I- (aq) + K+ (aq) + Cl- (aq)

Overall, the reaction is a neutralization reaction because Na+ and K+ cations from NaCl and KI, respectively, switch partners with the I- and Cl- anions from KI and NaCl, respectively.

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A decomposition reaction occurs when one reactant breaks down into two or more products. It can be represented by the general equation: AB → A + B. In this equation, AB represents the reactant that begins the reaction, and A and B represent the products of the reaction.

RbCI = rubidium chloride

The molar solubility of PbI₂ in (a) pure water is 2.2 x 10⁻⁵ M and (b) in 0.50 L of solution containing 15.0 g of FeI₃ is 1.6 x 10⁻⁵ M.

(a) we need to calculate the molar solubility of PbI₂ in pure water. The Ksp expression for PbI₂ is given as:

Ksp = [Pb²⁺][I⁻]² = 1.4 x 10⁻⁸

Assuming that the initial molar solubility of PbI₂ is 's', the final concentration of Pb²⁺ and I⁻ ions will be 's' and '2s', respectively. Thus, the Ksp expression can be written as:

Ksp = s × (2s)² = 4s³

Solving for 's', we get:

s = (Ksp/4)^(1/3) = (1.4 x 10⁻⁸/4)^(1/3) = 2.2 x 10⁻⁵ M

(b) we need to calculate the molar solubility of PbI₂ in a solution containing 15.0 g of FeI₃ in 0.50 L. First, we need to calculate the concentration of FeI₃ in the solution. The molar mass of FeI₃ is 437.9 g/mol, so the number of moles of FeI₃ in 15.0 g is:

n = m/M = 15.0 g/437.9 g/mol = 0.034 mol

The concentration of FeI₃ in the solution is:

[FeI₃] = n/V = 0.034 mol/0.50 L = 0.068 M

Next, we need to calculate the concentration of I⁻ ions in the solution, assuming that all of the FeI₃ dissociates completely into Fe³⁺ and I⁻ ions. The concentration of I⁻ ions will be equal to the concentration of FeI₃, i.e., [I⁻] = 0.068 M. Using this value and the Ksp expression for PbI₂, we can calculate the molar solubility of PbI₂ as follows:

Ksp = [Pb²⁺][I⁻]²

s = [Pb²⁺] = Ksp/[I⁻]² = 1.4 x 10⁻⁸/(0.068 M)² = 1.6 x 10⁻⁵ M.

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Answer:

Converting between matter

Explanation:

Chemical reactions can be the decomposition or synthesis of matter.

In chemistry, hypochlorite is an anion with the chemical formula ClO−. It combines with a number of cations to form hypochlorite salts. The pKb for hypochlorous anions, ClO-, is 6.48 at 25°C

The Ka expression for hypochlorous acid, HClO, is:

Ka = [H+][ClO-] / [HClO]

At 25°C, the value of Ka for HClO is \(3.0*10^{-8}\). We can use this value to calculate the Kb expression for its conjugate base, hypochlorite ion, ClO-:

Kw = Ka x Kb

where Kw is the ion product constant for water, which is \(1.0*10^{-14}\) at 25°C.

Solving for Kb, we get:

Kb = Kw / Ka = (\(1.0*10^{-14}\)) / (\(3.0*10^{-8}\)) = \(3.33*10^{-7}\)

Now, we can use the relationship between Ka and Kb to calculate the pKb of hypochlorite ion:

pKb = -log(Kb) = -log(\(3.33*10^{-7}\)) = 6.48

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The pH of the sodium hydroxide (NaOH) solution is 11.7.

Sodium hydroxide is a strong base and has a very high pH.

To calculate the pH of the solution, you must first calculate the molarity of the solution. To do this, divide the mass of sodium hydroxide by its molar mass, then divide that number by the volume of the solution.

Molarity = (0.40 g NaOH) / (40 g/mol) / (2.0 L) = 0.005 M = 5 x 10⁻³M.

The pH of a strong base is equal to its pOH plus 14. Since pOH is equal to -log[OH-], we can use the molarity of the solution to calculate the pH.

pOH = -log(5 x 10⁻³ M) = 2.30= 11.7

Therefore, the pH of the solution is equal to 14 - 2.30 = 11.7.

Therefore, 0.40 g of sodium hydroxide (NaOH) pellets dissolved in water will create a solution with a pH of 11.7.

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Alex buys a drink with the volume of 1.00 pint then 1000 milliliters of the drink will alex consume if he drinks the whole carton then 100000 milliliters.

A milliliter is a unit used to define the amount of of volume for liquids and gases which is equal to the  equal to a thousandth of a liter. A milliliter is a form of the thousandth of a liter. The ml symbol is stands for milliliter.

A metric unit of volume or liquid is  equal to one thousandth of a liter. metric capacity unit - a capacity unit defined in metric terms this is the difference.

Therefore, Alex buys a drink with the volume of 1.00 pint then 1000 milliliters of the drink will alex consume if he drinks the whole carton then 100000 milliliters.

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Answer:

Molecules in the water move in a circular motion

Explanation:

Because of its circular motion it causes the waves to look like open circles which makes it easy for people to surf on

Water molecules move up and forward, down and back, in an overall circular motion in the wave. Therefore, option A is correct.

Circular motion is defined as the movement of an object while rotating in a circle. Circular motion can be uniform or asymmetric.

The angular rate of rotation and speed are constant in uniform circular motion, but the rate of rotation changes in non-uniform circular motion.

This means that circular motion can occur only if there is a "center seeking" force present; otherwise, things will travel in a straight line.

Within the wave, the water molecules move in a circular motion. Each water particle moves in a complete circle during a single wave period. The circle traced by a water particle on the ocean surface as a wave passes a given point has a diameter equal to the height of the wave.

Thus, option A is correct.

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The Coase theorem is an economic concept that suggests that, under certain conditions, private parties can efficiently resolve externalities through bargaining without the need for government intervention. It was developed by economist Ronald Coase.

First, property rights must be well defined, allowing individuals to negotiate and make agreements.

Second, transaction costs, such as the costs of gathering information and enforcing agreements, should be low.

Overall, the Coase theorem highlights the potential for private bargaining to efficiently resolve externalities when certain conditions are met.

It emphasizes the importance of well-defined property rights and low transaction costs in facilitating voluntary agreements between parties.

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The new volume of the air bubble that has an initial volume of 5.0 ml released at the bottom of a lake where the pressure is 3.0 atm is 15mL.

The volume of a given gas can be calculated by using the following formula:

P1V1 = P2V2

Where;

5 × 3 = 1 × V2

15 = V2

V2 = 15mL

Therefore, the new volume of the air bubble that has an initial volume of 5.0 ml released at the bottom of a lake where the pressure is 3.0 atm is 15mL.

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Answer: It will increase

Explanation:

The concentration of hydroxide ions in pure water at 30.0°C can be determined using the equation for the ion product of water, Kw.

Kw is equal to the product of the concentrations of hydrogen ions (H+) and hydroxide ions (OH-) in water. At 30.0°C, the given value of Kw is 1.47×10^-14.

Since pure water is neutral, the concentration of H+ ions is equal to the concentration of OH- ions. Therefore, to find the concentration of hydroxide ions, we can take the square root of Kw.

√(1.47×10^-14) = 1.21×10^-7 M.

Therefore, the concentration of hydroxide ions in pure water at 30.0°C is 1.21×10^-7 M.

In summary, the concentration of hydroxide ions in pure water at 30.0°C is 1.21×10^-7 M, as calculated using the ion product of water equation and the given value of Kw.

It's worth noting that at 30.0°C, pure water is still neutral as the concentration of H+ ions is equal to the concentration of OH- ions.

This equilibrium between H+ and OH- ions results in a pH value of 7, indicating a neutral solution.

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Answer:

Law of conservation of mass

Ernest Rutherford

Explanation:

The basic law of behavior of matter that states that "mass is neither created nor destroyed in a chemical reaction or physical change".

This is the law of conservation of mass. It is very essential in understanding most chemical reaction. Also, in quantitative analysis, this law is pivotal.

Ernest Rutherford was the scientist that stated that the nucleus is made up of positive charge. It was not until James Chadwick in 1932 discovered the neutron that we had an understanding of this nuclear component.

Rutherford surmised from his experiment that because most the alpha particles passed through the thin Gold foil and just a tiny fraction was deflected back, the atom is made is made up of small nucleus that is positively charged.

If you use the molecular orbital theory, option C, which is the paramagnetism of oxygen particles, you can explain the odd thing that Lewis structures can't explain.

The fact that oxygen particles are paramagnetic doesn't make sense in terms of Lewis structure. Since oxygen atoms have two electrons that don't have a partner, only molecular orbital theory can explain why oxygen particles are paramagnets. A Lewis structure is a much better way to show how the electrons in a particle's valence shell are arranged. It is used to show how the electrons around the different atoms in a particle are arranged. Electrons are shown as "dabs" or as a line running between two particles. In his cubical particle hypothesis, Lewis came up with the "octet rule." The octet rule is based on the fact that iotas tend to like having eight electrons in their valence shell. When molecules have fewer than eight electrons, they usually react by making more stable mixtures. Atoms will act to get into the most stable state possible.

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Answer:

c. The rusting of the joints of a metal children’s swing set.

Explanation:

By definition, chemical property describes the ability of a substance to undergo a specific chemical change.

In the definition above, the key words are; "Chemical change".

Generally, chemical changes are irreversible. This means we just have t observe the options and pick the one that contains an irreversible change.

Upon doing ths, the correct option is;

c. The rusting of the joints of a metal children’s swing set.

This is because rusting is a chemical change and is irreversible.

No, the volume of water in a beaker is not an extensive property.

Extensive properties are those that depend on the amount or size of the substance being measured. In other words, they are properties that change with the quantity of the substance. Examples of extensive properties include mass, volume, and total energy.

In the given scenario, the volume of water in the beaker is 50 milliliters. This volume remains the same regardless of the quantity of water present. Whether it's 50 milliliters or 500 milliliters, the volume measurement does not change. Therefore, the volume of water in the beaker is an example of an intensive property.

Intensive properties are independent of the amount or size of the substance. They are characteristics that remain constant regardless of the quantity of the substance. Examples of intensive properties include temperature, density, and color.

It's important to note that the distinction between extensive and intensive properties depends on the specific property being considered. While volume is typically an extensive property for a bulk substance, in the case of a fixed volume of water in a beaker, it becomes an intensive property.

In summary, the volume of water in a beaker is not an extensive property but rather an intensive property because it does not change with the quantity of the substance.

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Answer:

!dk bestie i tried to do it but i cant maybe someone else can figure it or they already did :( anyway i hope you have a amazing day luv <3

Answer: 1cm³= 1mL

Explanation:

The reactions with the highest activation energies require the reactants to break over a thermodynamic barrier before products may be created. Chemical reactions have a strong correlation.

Between their activation energy and pace. More specifically, the slower the chemical reaction is, the larger the activation energy is. This is so because molecules cannot start a reaction until they have surpassed the activation energy barrier.

Extreme Reactions A pleasant response or a spontaneous reaction are two names for an exergonic reaction. Exergonic reactions disperse energy across the environment. The chemical bonds that are created as a result of the reaction are stronger than the ones that the reactants broke. As a result, the system's free energy falls.

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The density of the substance having a mass of 2.0 g is 0.4 g/mL (Option D)

First, we shall obtain the volume of the substance. This can be obtained as follow:

Volume of substance = (Volume of water + substance) - (Volume of water)

Volume of substance = 75 - 70

Volume of substance = 5 mL

Finally, we shall determine the density of the substance. This is illustrated below:

Density = mass / volume

Density of substance = 2 / 5

Density of substance = 0.4 g/mL

Thus, the density is 0.4 g/mL (Option D)

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Answer:

i believe its 1.56

Explanation:

Answer:

I'm gonna say A and B

Explanation:

Not sure though

Hope I helped :)

the root-mean-square speed of the gas molecules will increase by a factor of √3 when the absolute temperature is tripled.

The root-mean-square speed of gas molecules is directly proportional to the square root of the absolute temperature. Therefore, if the absolute temperature of a gas is tripled, the root-mean-square speed of the molecules will increase.

Mathematically, the relationship between root-mean-square speed (v) and absolute temperature (T) can be expressed as:

v ∝ √T

When the absolute temperature (T) is tripled (3T), the root-mean-square speed (v) will be:

v ∝ √(3T)

Taking the square root of 3T:

v ∝ √3 √T

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The solubility of mercury (II) hydroxide, Hg(OH)2 in grams per liter is 2.04 × 10⁻⁹ g/L. The value of Ksp for mercury(II) hydroxide, Hg(OH)2 is 3.60 × 10⁻²⁶.

Ksp or Solubility product constant is used to describe the degree to which a solid will dissolve in a solution. When two ions are combined, they create a solubility product constant.Ksp equation:Hg(OH)₂ ⇌ Hg²⁺ + 2OH⁻Ksp = [Hg²⁺][OH⁻]²The Ksp value of mercury(II) hydroxide is given as 3.60 × 10⁻²⁶.

To determine the solubility of Hg(OH)₂ in grams per liter, we need to calculate the concentration of mercury and hydroxide ions in the solution as follows:Ksp = [Hg²⁺][OH⁻]²3.60 × 10⁻²⁶ = [x][2x]²where x is the concentration of Hg²⁺ and 2x is the concentration of OH⁻.3.60 × 10⁻²⁶ = 4x³8.98 × 10⁻⁹ = x³x = 2.04 × 10⁻³ mol/L = 2.04 × 10⁻⁹ g/LTherefore, the solubility of mercury(II) hydroxide, Hg(OH)2 in grams per liter is 2.04 × 10⁻⁹ g/L.

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Answer:

by wind

Explanation:

As the radius of the star increases, the mass will also increase.

This is all about the relationship between the radius and mass of stellar main sequence stars.

Now, usually they are expressed in solar units and as such as seen in the graph image attached, the relationship between the radius(R) and mass(M) of a main-sequence star is seen by the curve attached. It is clear that the higher the radius becomes, the larger the mass of the star also becomes.

To clarify this also, we have a mass - lumosity relationship formula where given as;

L = \(M^{3.5}\)

Where;

M is mass

L is lumosity

We know from basics of stellar main sequence stars, that a larger radius gives a much brighter lumosity.

From the mass-lumosity formula, we see that Increase in lumosity is directly proportional to an increase in mass. Therefore in the same vein, we can say that increase in radius is directly proportional to an increase in mass.

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