A solution is made by dissolving 86.68 {dg} of hydrochloric acid, {HCl} , in 0.1441 {~kg} of water. What is the concentration in parts per million? Key Concept: S

Answer:

2Na + 2H2O → 2NaOH + H2

Explanation:

A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge are the same for both the reactants and the products.

Is male circle or square? and is the disorder black or white?

Answer:2 duce dose

Explanation:

jit you see the picture now vote

Answer:

Option A, describes the endothermic reaction represented by this  graph

Explanation:

In this graph the energy released (or the potential energy) at the time of product formation is lower than the potential energy of the reactants. Hence, additional energy input will be required to form the product. Thus, energy is absorbed during the reaction.

Option A is correct

Answer: energy is given off by the reaction

Explanation:

The correct answer is B. Adding 0.050 moles of NaOH will destroy the buffer effectiveness in buffer solution.

A buffer solution is a solution that can resist changes in pH when small amounts of acid or base are added to it. In this case, the buffer solution consists of acetic acid (HC2H3O2) and its conjugate base (C2H3O2- or NAC2H3O2).

To determine if an action will destroy the buffer effectiveness, we need to consider what happens to the buffer components and how they affect the pH of the solution.

A. Adding 0.050 moles of NaC2H3O2: This will not destroy the buffer effectiveness because we are adding more of the conjugate base, which can react with any added acid to maintain the pH.

B. Adding 0.050 moles of NaOH: This will destroy the buffer effectiveness because the added base will react with the weak acid (HC2H3O2) to form water and the acetate ion (C2H3O2-), which is a strong conjugate base. This will shift the equilibrium towards the products and decrease the concentration of the weak acid, making it less effective at resisting changes in pH.

C. Adding 0.050 moles of HCl: This will not destroy the buffer effectiveness because we are adding acid, which can be neutralized by the buffer components.

D. Adding 0.050 moles of HC2H3O2: This will not destroy the buffer effectiveness because we are adding more of the weak acid, which can react with any added base to maintain the pH.

E. None of the above: This is not the correct answer because option B (adding 0.050 moles of NaOH) will destroy the buffer effectiveness.

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The skeletal system is the system that provides support to an organism, internal and made up of bones and cartilage in vertebrates, external in some other animals.

Tendon is a tough band of flexible but inelastic fibrous collagen tissue that connects a muscle with its bony attachment and transmits the force which the muscle exerts.

The femur is the bone that extends from the pelvis to the knee in humans. It is the largest bone of the human body.

The carpal bones are any of the eight bones of the carpus, which is the group of bones that make up the wrist.

The osseous or bone tissue is the major structural and supportive connective tissue of the body which forms the rigid part of the bone organs that make up the skeletal system.

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Answer:

Graham's law states that the rate of effusion or of diffusion of a gas is inversely proportional to the square root of its molecular weight. So, rate of diffusion of hydrogen gas is four times faster than oxygen gas.

Explanation:

Answer:

Rate of diffusion of hydrogen is higher than other gases because mass of hydrogen is very small and it diffuses easily.

Explanation:

Option A. Hydrogen Ions

The dissolution of carbon dioxide in the oceans produce hydrogen ions as when carbon dioxide is dissolved in the ocean it leads to Ocean Acidification. This Acidification produces the hydronium ions as more acidic nature implies higher concentrations of hydrogen ions.

Carbon dioxide is a gas that readily dissolves in water to give Carbonic Acid , bicarbonate ions and carbonate ions , all of which are acidic in nature. This lowers the pH of the ocean making the waters more acidic. Therefore the acidity of oceans is largely dependent on carbon compounds and the amount of Carbon dioxide.

The reaction of Carbon dioxide with water to give carbonic acid :

                                CO2 + H2O → H2CO3

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Answer:

the answer is 2040

Explanation:

force is given as the product of mass and acceleration

Answer:

Approximately \(0.20\; \rm L\).

Explanation:

Convert the temperature of this gas to absolute temperature:

\(T = 25\; \rm ^\circ C \approx (25 + 273.15)\; \rm K = 298.15\; \rm K\).

Let \(P\) and \(V\) represent the pressure and volume of this gas, respectively. Let \(n\) represent the number of gas particles in this gas. Let \(R\) represent the ideal gas constant. By the ideal gas law:

\(P \cdot V = n \cdot R \cdot T\).

For this question:

Look up the ideal gas constant \(R\) that takes \(\rm atm\) as the unit for pressure:

\(R \approx 0.082057\; \rm L \cdot atm \cdot K^{-1}\cdot mol^{-1}\).

This question is asking for \(V\), the volume of this gas. Rearrange the ideal gas equation and solve for \(V\):

\(\begin{aligned} V &= \frac{n \cdot R \cdot T}{P} \\ &\approx \frac{0.00831\; \rm mol\times 0.0082057\; \rm L \cdot atm \cdot K^{-1}\cdot mol^{-1}\cdot 298.15\; \rm K}{1.01\; \rm atm} \\ &\approx 0.0020\; \rm L\end{aligned}\).

Answer:

Nucleic Acids

Proteins

Carbohydrates

Lipids

Nucleic acids, proteins, carbohydrates, and lipids are the four types of organic molecules that all organisms require; life is impossible without any of these substances.

Fats, waxes, sterols, fat-soluble vitamins, monoglycerides, diglycerides, phospholipids, and other naturally occurring molecules are included in the large class of molecules known as lipids. Lipids have a variety of roles in the body, including energy storage, signaling, and serving as structural elements of cell membranes.

Lipids have three main biological activities in the body: they are essential signaling molecules, structural elements of cell membranes, and energy storage facilities.

Four different categories of carbon-based compounds make up every living thing: Carbohydrates. Lipids. Proteins. DNA and RNA.

Carbohydrates, lipids, proteins, and nucleic acids are the four main types of organic substances that are present in all living things. Carbohydrates are used as energy sources by almost all organisms. Additionally, some carbs act as building blocks.

Thus, the four types of carbon molecules (organic compounds) found within living organisms are Nucleic acids, proteins, carbohydrates, and lipids.

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The molarity (in mole per liter), given that 16.87 mg of LiBr is in 328.1 mL of solution is 0.0004 mole per liter

First, we shall obtain the mole of 16.87 mg of LiBr. This is shown below:

Mole of LiBr = mass / molar mass

= 0.01687 / 86.845

= 0.000194 mole

Finally, we shall determine the molarity. This is shown below:

Molarity = mole / volume

= 0.000194 / 0.3281

= 0.0004 mole per liter

Thus, the molarity is 0.0004 mole per liter

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The equation below is photosynthesis .

6CO₂ + 6H₂O → \(C_{6} H_{12} O_{6}\) + 6O₂

Water and carbon dioxide are converted into food by the process of photosynthesis , which occurs in the presence of sunlight in plants and photosynthetic bacteria . They create oxygen as a byproduct and glucose as the food . The photosynthesis equation is given as ,

6CO₂ + 6H₂O → \(C_{6} H_{12} O_{6}\) + 6O₂

This indicates that the reactants, six carbon dioxide molecules and six water molecules, are transformed into a sugar molecule and six oxygen molecules, the products, by light energy being absorbed by chlorophyll (implied by the arrow).

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Answer:

In both natural and built systems, stability and change are an important focus of study for both scientists and engineers. Stability refers to a system that is unchanging. ... A dynamic equilibrium exists when chemical reactions or physical movements occur at rates that balance out, creating no net change in a system.

Answer:

In both natural and built systems, stability and change are an important focus of study for both scientists and engineers. Stability refers to a system that is unchanging. ... A dynamic equilibrium exists when chemical reactions or physical movements occur at rates that balance out, creating no net change in a system.

Explanation:

The coefficients in a balanced equation can be used as molar ratios, which can act as conversion factors to relate the reactants to the products. These conversion factors state the ratio of reactants that react but do not tell exactly how much of each substance is actually involved in the reaction.

The LD50 (Lethal Dose 50) is a measure used in toxicology to determine the lethal dose of a substance that would cause death in 50% of the test population.

However, it is important to note that conducting experiments to determine the LD50 of a substance on humans is unethical and illegal. The LD50 values are typically determined through animal testing, usually on rodents such as rats or mice.To calculate the amount of a substance that would harm a person of a certain weight, various factors need to be considered, including the toxicity of the substance and the individual's weight. In toxicology, a commonly used measure is the oral median lethal dose (LD50) expressed as milligrams per kilogram of body weight (mg/kg).To estimate the harmful dose for an individual of a certain weight, you would need to know the LD50 value of the substance and apply it to the weight of the person. The calculation involves multiplying the LD50 value by the person's weight in kilograms. However, it is crucial to emphasize that estimating harmful doses for humans based on animal LD50 values alone can be inaccurate and potentially dangerous.

It is essential to consult professionals in toxicology or poison control centers to obtain accurate information regarding the toxicity of a substance and its potential effects on human health.

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Answer:

Chemical Energy

Explanation:

Energy, Molecules and Chemical Reactions. Energy, potential energy, is stored in the covalent bonds holding atoms together in the form of molecules. This is often called chemical energy.

The molar mass of the unknown gas is approximately 31.27 g/mol.

To determine the molar mass of an unknown gas, use the ideal gas law equation:

PV = nRT

Where:

P = Pressure (in atm)

V = Volume (in liters)

n = Number of moles

R = Ideal gas constant (0.0821 L·atm/(mol·K))

T = Temperature (in Kelvin)

First,  need to convert the given values to the appropriate units:

Pressure (P) = 728 mmHg = 0.961 atm

Volume (V) = 102 ml = 0.102 L

Temperature (T) = 97°C = 370 K (converted to Kelvin)

Next,  rearrange the ideal gas law equation to solve for the number of moles (n):

n = PV / RT

Substituting the values:

n = (0.961 atm) * (0.102 L) / (0.0821 L·atm/(mol·K) * 370 K)

n = 0.01244 mol

Now , determine the molar mass (M) of the gas using the formula:

Molar Mass (M) = Mass (m) / Moles (n)

Given that the mass (m) of the gas is 0.389 g and the moles (n) calculated above is 0.01244 mol:

M = 0.389 g / 0.01244 mol

M ≈ 31.27 g/mol

Therefore, the molar mass of the unknown gas is approximately 31.27 g/mol.

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Running requires the body to transform potential energy into kinetic energy. A system's internal energy is known as its potential energy. When a system moves horizontally using kinetic energy, potential energy is consumed.

Potential energy is conserved as chemical energy in the human body. The food that a person eats during the day provides the chemical energy. The body requires a specific number of calories, or the energy from food, to carry out specific tasks. The runner will run out of potential energy and weary if they have not consumed enough calories during the day. This is due to the body's poor capacity for storing energy. Although energy cannot be created or destroyed, it may move. The majority of the person's stored energy is released as thermal energy while they run.

The impact of the runner's foot on the ground causes sound waves to be emitted, which releases energy from the runner's body. Every stride a runner takes releases energy from their body, thus it's critical for them to eat adequate chemical energy in the form of calories before their run. The body of the runner need a significant number of calories as a reserve so that they will have more energy to burn as their stored energy is released during the run.

The body is not particularly effective at preserving this energy when it uses the calories it has already consumed. The heat (thermal energy) that the body emits when it transforms its stored (potential) chemical energy into kinetic energy causes around 75% of the chemical energy that the runner has ingested to be wasted as the leg muscles contract to propel the runner forward. The flow chart is attached below.

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The enthalpy change (ΔH) for the physical change of Br2 from the gas phase to the gas phase (Br2(g) → Br2(g)) is zero. The entropy change (ΔS) for this physical change is also zero.

In a physical change, the chemical substance remains the same, and there is no breaking or forming of chemical bonds. In the case of Br2 going from the gas phase to the gas phase, there is no change in the chemical identity or composition of the substance.

The enthalpy change (ΔH) measures the heat energy transfer during a reaction or process. Since there is no change in the chemical bonds or composition of Br2 in this physical change, there is no transfer of heat energy, and thus ΔH is zero.

The entropy change (ΔS) quantifies the degree of disorder or randomness in a system. In this physical change, the arrangement and distribution of Br2 molecules remain unchanged, leading to no change in entropy. Therefore, ΔS is also zero.

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The question requires us to calculate the mass, in grams, contained in 5.26 x 10^-4 mol of HC2H3O2.

To solve this question, first we need to calculate the molar mass of the compound, considering the number of atoms of each element, and then relate the value obtained with the number of moles given (5.26 x 10^-4 mol).

First, to calculate the molar mass of the compound, let's consider the following atomic masses:

atomic mass of C = 12.01 u

atomic mass of H = 1.007 u

atomic mass of O = 15.99 u

Next, we calculate the molar mass. To do that, we need to consider the number of atoms of each element: according to the chemical formula, there are 2 atoms of C, 4 atoms of H and 2 atoms of O:

molar mass (C2H4O2) = (2 * 12.01) + (4 * 1.007) + (2 * 15.99) = 60.03 g/mol

Now, we know that there are 60.03 g for each mol of the compound. With that information, we can estabilish the following relation to calculate the mass contained in 5.26 x 10^-4 mol of the compound:

1 mol --------------------- 60.03 g

5.26 x 10^-4 mol ----- x

Solving for x, we have:

Therefore, there are 0.03158 g of HC2H3O2 in 5.26 x 10^-4 mol of this compound.

Dry heat can both enhance and diminish the thickening ability of starch while also inducing unwanted color changes. Proper control of temperature is a critical factor that significantly impacts the overall outcome.

When subjected to high temperatures, starch granules undergo swelling and even burst. This leads to the release of starch molecules into the surrounding liquid, resulting in thickening and imparting a viscous texture. This phenomenon is commonly observed in sauces and gravies as they simmer and thicken on the stove.

However, excessive heat can cause a loss of thickening ability and undesirable color changes. When exposed to temperatures above 170°C, starch molecules can undergo breakdown and begin to brown. This gives rise to a yellow or brown color in the final product. A familiar example is bread, which turns brown during baking due to these color changes.

To preserve the desired texture and color of the final product, it is crucial to carefully monitor the heat when working with starch. Maintaining control over the temperature and duration of heat exposure becomes essential.

In summary, dry heat can both enhance and diminish the thickening ability of starch while also inducing unwanted color changes. Proper control of temperature is a critical factor that significantly impacts the overall outcome.

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Answer:

B

Explanation:

it flows by the conduction currents

Answer:

The sugar will dissolve in water.

The oil will float in water.

Explanation:

The sugar molecules will fill up the remaining space between the molecules of water.

The oil being lighter and less denser than water floats in the water.

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The partial reactions where the reactant is undergoing reduction is d. PbO Pb.

Reduction is a process in which an atom or molecule gains electrons. In the given partial reactions, we need to determine which reactant is undergoing reduction.

In option (a), SnO is being oxidized to SnO₂, which means it is losing electrons and undergoing oxidation. Therefore, SnO is not undergoing reduction in this reaction. In option (b), Cu₂O is being oxidized to CuO, which means it is also not undergoing reduction. In option (c), KClO₂ is being oxidized to KClO₃, which means it is also not undergoing reduction. Finally, in option (d), PbO is being reduced to Pb, which means it is gaining electrons and undergoing reduction. Therefore, the correct answer is (d) PbO Pb. In this reaction, PbO is being reduced and Pb is being oxidized.

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Answer:

Explanation:

Any substance that contains only one kind of an atom is known as an element. Because atoms cannot be created or destroyed in a chemical reaction, elements such as phosphorus (P4) or sulfur (S8) cannot be broken down into simpler substances by these reactions.

Example: Water decomposes into a mixture of hydrogen and oxygen when an electric current is passed through the liquid. Hydrogen and oxygen, on the other hand, cannot be decomposed into simpler substances. They are therefore the elementary, or simplest, chemical substances - elements.

Each element is represented by a unique symbol. The notation for each element can be found on the periodic table of elements.

The elements can be divided into three categories that have characteristic properties: metals, nonmetals, and semimetals. Most elements are metals, which are found on the left and toward the bottom of the periodic table. A handful of nonmetals are clustered in the upper right corner of the periodic table. The semimetals can be found along the dividing line between the metals and the nonmetals.

Answer:

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Explanation:

The molarity of the CaCl₂ solution, which contains 2.5 moles of CaCl₂ in one liter, is 2.5 mol/L.

Molarity is a measure of the concentration of a solute in a solution, expressed as the number of moles of solute per liter of solution (mol/L). In this case, the given information states that one liter of the CaCl₂ solution contains 2.5 moles of CaCl₂.

To calculate the molarity, we divide the number of moles of solute (CaCl₂) by the volume of the solution in liters (1 L):

Molarity = Number of moles of solute / Volume of solution (in liters)

Molarity = 2.5 moles / 1 L

Molarity = 2.5 mol/L

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Answer:

Explanation:

Sacrificial protection is a corrosion protection method in which a more electrochemically active metal is electrically attached to a less active metal. The highly active metal donates electrons to replace those which may have been lost during oxidation of the protected metal.

Electroplating is a general name for processes that create a metal coating on a solid substrate through the reduction of cations of that metal by means of a direct electric current. The part to be coated acts as the cathode (negative electrode) of an electrolytic cell; the electrolyte is a solution of a salt of the metal to be coated; and the anode (positive electrode) is usually either a block of that metal, or of some inert conductive material. The current is provided by an external power supply.

Answer:

hydrogen oxygen or nitrogen

The crystal system that exhibits the specified interaxial angle relationship is the hexagonal system.

The crystal system that has the following interaxial angle relationship is the hexagonal system. In the hexagonal system, the interaxial angle between any two crystallographic axes is 120 degrees, which is a characteristic feature of this system. The other crystal systems, including triclinic, tetragonal, orthorhombic, monoclinic, rhombohedral, and cubic, do not have a fixed interaxial angle relationship. Each of these systems has its own unique set of interaxial angles that define their crystal structures. Therefore, the interaxial angle relationship specified in the question specifically corresponds to the hexagonal crystal system.

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