i need help with this questions answer quick please (science)

A very strong molecule that used in mining and refining oil, and also used in cleaning agents, the molecule is sulfuric acid.

H₂SO₄, often known as sulfuric acid, is a corrosive chemical that harms the skin, eyes, teeth, and lungs. Extreme exposure can be fatal. Worker exposure to sulfuric acid may be harmful.

The dose, timeframe, and nature of the task determine the exposure level. In several industries, sulfuric acid is employed.

Concentrated sulfuric acid is a very corrosive chemical that might explode. It may burn the skin severely, irritate the nose and throat, make breathing difficult, and possibly result in blindness. If eaten, it can burn holes in the stomach.

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Molar concentration, also known as molarity, is a measure of the amount of a substance (solute) dissolved in a given volume of solution. It is expressed in moles of solute per liter of solution (mol/L or M).

a) The chemical equation for the dissociation of acetic acid (CH3COOH) in water can be written as:

CH3COOH + H2O ⇌ CH3COO- + H3O+

b) The Ka expression for this reaction represents the acid dissociation constant and can be written as:

Ka = [CH3COO-][H3O+] / [CH3COOH]

In this expression, [CH3COO-] represents the concentration of acetate ions, [H3O+] represents the concentration of hydronium ions (formed from the dissociation of water), and [CH3COOH] represents the concentration of acetic acid.

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The mass of the carbon dioxide is  49.72 g from the calculation done.

The phrase "mole fraction," which is often referred to as "molar fraction" or "amount fraction," is used to describe the proportions of a mixture's components. It is an intangible quantity that expresses the proportion between the moles of a given component and the total moles in the combination.

We know that;

Number of moles of ethanol = 9.2/46 g/mol

= 0.2 moles

Now;

Number of moles of water = 216.0 g/18 g/mol

= 12 moles

Mole fraction of water = Number of water/ Total number of moles

0.9 = 12/12 + 0.2 + x

0.9(12.2 + x) = 12

10.98 + 0.9x = 12

x = 1.13 moles

Now;

Moles = mass/Molar mass

1.13 = x/44

x = 49.72 g

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Labels for substances containing more than 0.3% of formaldehyde must specifically state that they contains formaldehyde.

This is because formaldehyde is classified as a hazardous substance and exposure to high concentrations can pose health risks. Therefore, substances containing more than 0.3% of formaldehyde must be clearly labeled to inform consumers and users about the presence of this chemical. The label may include phrases such as "Contains formaldehyde" or "Formaldehyde content > 0.3%," ensuring that individuals are aware of its presence and can take appropriate safety precautions.

Hence, substances containing more than 0.3% of formaldehyde must state that they contains formaldehyde.

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An object will have particles with the highest average kinetic energy, such as a drop of water at 90 °C, which is the third option as the average kinetic energy of particles in a substance is directly related to its temperature (T). 

In this case, the drop of water at 90°C has a higher temperature compared to the other options provided. The iceberg at 0°C has a lower temperature, so its particles have lower average kinetic energy. Similarly, the water at 40°C in a swimming pool and water at 37°C in a glass have lower temperatures than the drop of water at 90°C, so their particles also have lower average kinetic energy. Therefore, the drop of water at 90°C will have particles with the highest average kinetic energy among the given options.

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complete question is below

Which object will have particles with the highest average kinetic energy? (1 point)

an iceberg at 0°C

water at 40°C in a swimming pool

a drop of water at 90°C

O water at 37°C in a glass

The correct protein pairing is:

Structural proteins provide the body tensile strength. Option B

This pairing is appropriate since structural proteins like collagen and keratin are known for their function in giving tissues and bodily structures stability and strength. They provide the tensile strength of several biological components, such as bones, tendons, ligaments, and skin.

Globular proteins are not specifically active in their secondary structure. Globular proteins have complex three-dimensional structures and are known for their functional diversity.

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According to the information, we can infer that a 19.2-pound child would need to take approximately 2.49 tablets of 250.0 mg ampicillin per day.

To calculate the number of tablets the child needs to take, we first need to convert the weight of the child from pounds to kilograms. Since there are 2.20 pounds in 1 kg, we divide 19.2 pounds by 2.20 to get the weight in kilograms, which is approximately 8.73 kg.

Next, we calculate the daily dose of ampicillin for the child by multiplying the weight in kilograms by the recommended dosage of 115 mg/kg.

Since the available tablet size is 250.0 mg, we divide the total daily dose by the tablet size to find out how many tablets the child needs to take per day.

According to the above, we can infer that since we can't have a fraction of a tablet, we round the result to the nearest whole number. Therefore, a 19.2-pound child would need to take approximately 2.49 tablets (rounded to 2) of 250.0 mg ampicillin per day.

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Archimedes' principle: Picture yourself in a pool and imagine trying to push a floating ball underwater. Well, Archimedes figured out that when an object is in a fluid (like water), it experiences an upward force called buoyancy. This force is equal to the weight of the fluid that the object displaces. So, if the object is less dense than the fluid, it floats because the buoyant force supports it. But if it's denser, it sinks. Archimedes' principle helps us understand why things float or sink in water!

Bernoulli's principle: Imagine sticking your hand out of the window of a moving car. Have you noticed that when you tilt your hand upward, you feel a lighter pressure on it? Well, that's Bernoulli's principle in action! It tells us that when a fluid (like air or water) moves faster, its pressure decreases. So, when the air above your hand moves faster due to the car's motion, it creates a lower pressure, making your hand feel lighter. This principle helps explain how planes fly, how sprinklers work, and more!

Flow rate equation: Picture a hose with a nozzle. If you partially cover the nozzle with your thumb, the water shoots out faster, right? That's because of the flow rate equation! This equation tells us that when a fluid flows through a pipe or a hose, the product of its velocity and the cross-sectional area of the pipe remains constant. So, when you reduce the area by covering part of the nozzle, the fluid speeds up to keep the flow rate constant. It's like squeezing the hose to make the water come out faster!

Pascal's Principle: Pascal's principle, named after the French mathematician and physicist Blaise Pascal, states that when pressure is applied to a confined fluid, the change in pressure is transmitted equally to all parts of the fluid. In other words, any change in pressure applied to a fluid in an enclosed system is transmitted undiminished to every portion of the fluid and to the walls of the container. This principle forms the basis for various hydraulic systems and is important in understanding the behavior of fluids under pressure.

The statement above aligns with Pascal's principle and therefore option D is correct.

Answer:

Explanation:

Job/Situation 1: Chemical laboratory technician, where the importance is ,in a chemical laboratory, precise measurement of chemicals and substances is crucial for conducting experiments, formulating accurate solutions, and bad things are are not accurate or balanced in a chemical laboratory. Another is financial analyst,they deal with managing financial data, analyzing investments, bad thing is inaccuracy. Another is Chef where the cooking skill must be good. Risk is fire etc.

As a chef bad thing is ,it can lead to improperly seasoned dishes, inconsistent flavors, undercooked or overcooked food, and dissatisfied customers. It can harm the reputation of the restaurant, lead to negative reviews, and impact customer satisfaction and loyalty. , misinformed investment decisions, and financial losses are the bad of financial analyst etc.

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a) The saturated solubility level of KCl (aq) at 40°C is 35.7 g/100 mL of water.

b) No, the solution would not be saturated at 90°C. At this temperature, the solubility of KCl in water is higher than at 40°C. Therefore, more KCl can dissolve in 100 g of water at 90°C than at 40°C. To determine if the solution is saturated, we need to compare the amount of KCl that actually dissolved in the water to the maximum amount of KCl that can dissolve in the water at that temperature. If the amount of KCl that dissolved is less than the maximum amount, then the solution is unsaturated. If the amount of KCl that dissolved is equal to the maximum amount, then the solution is saturated. If the amount of KCl that dissolved is greater than the maximum amount, then the solution is supersaturated.

c) Two ways in which saturation can be achieved if only 40 g of KCl is added to 100 g of water at 90°C are:

i) Heating the solution to a higher temperature: As the temperature of the solution is increased, the solubility of KCl in water also increases. Therefore, by heating the solution to a higher temperature than 90°C, more KCl can be dissolved in the water until the solution becomes saturated.

ii) Allowing the solution to cool slowly: If the solutionis heated to a temperature higher than 90°C and then allowed to cool slowly, the solubility of KCl in water decreases as the temperature decreases. This means that as the solution cools, KCl will begin to precipitate out of the solution until the solution becomes saturated. Alternatively, if the solution is left undisturbed at 90°C and allowed to cool slowly, KCl will begin to precipitate out of the solution as it reaches its saturation point.

The methods that are used to extract the following metals ahev been explained as follows:

There are different ways in which metals can be extracted from the soil or other compounds. For instance, Aluminum is a metal that is extracted by electrolysis of a molten ionic compound.

Gold is obtained from the soil in its raw form and iron is extracted by reduction with carbon. Copper oxide is extracted by reduction with hydrogen.

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Sodium carbonate, often referred to as Na2CO3, is a chemical compound composed of atoms of sodium (Na), carbon (C) and oxygen (O).

It is also sometimes called washing soda or soda ash. At room temperature, sodium carbonate is a white, crystalline solid that is very soluble in water. According to the chemical formula of the sodium carbonate molecule, Na2CO3, each molecule consists of two sodium atoms (Na), one carbon atom (C) and three oxygen atoms (O). The atomic configuration in sodium carbonate is shown in the given diagram.

A trigonal planar arrangement is formed when the central carbon atom is bonded to three oxygen atoms. The structure of sodium carbonate is completed by two sodium atoms joined to oxygen atoms.

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The balanced redox reaction occurring in an acidic aqueous solution is given below.

Balanced Redox Reaction: A balanced redox reaction refers to a chemical reaction in which there is a transfer of electrons between reactant species, resulting in a change in oxidation states.

a. PbO₂(s) + 4I⁻(aq) + 4H⁺(aq) → Pb²⁺(aq) + 2I₂(s) + 2H₂O(l)

b. 2SO₃²⁻(aq) + 2MnO₄⁻(aq) + 2H₂O(l) → 2SO₄²⁻(aq) + 2Mn²⁺(aq) + 4OH⁻(aq)

c. S₂O₃²⁻(aq) + Cl₂(g) + 2H₂O(l) → 2SO₄²⁻(aq) + 2Cl⁻(aq) + 4H⁺(aq)

Therefore, the balanced redox reactions are given above.

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1. The pH of a 1.00 × 10^-7 M HCl solution is 7.00  

2. The pH of a 0.0450 M Ba(OH)2 solution is approximately 12.95.

To determine the pH of a solution, we need to consider how the given compound dissociates in water. Let's analyze the dissociation of each compound individually:

1. HCl:

HCl is a strong acid that completely dissociates into its ions when dissolved in water. In this case, the hydrogen chloride (HCl) molecule splits into a hydrogen ion (H+) and a chloride ion (Cl-). Since the concentration of HCl is 1.00 × 10^-7 M, the concentration of H+ ions is also 1.00 × 10^-7 M. The pH of the solution can be calculated using the formula pH = -log[H+]. The pH of the 1.00 × 10^-7 M HCl solution is 7.00.

2. Ba(OH)2:

Ba(OH)2 is a strong base that dissociates into barium ions (Ba2+) and hydroxide ions (OH-) in water. Since the concentration of Ba(OH)2 is 0.0450 M, the concentration of OH- ions is twice that value, which is 0.0900 M. To calculate the pOH of the solution, we can use the formula pOH = -log[OH-]. Thus, pOH = -log(0.0900) ≈ 1.05. Since pH + pOH = 14, we can determine the pH as pH ≈ 14 - 1.05 ≈ 12.95.

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Answer:

B) Charles's law involves the units of volume and pressure

The relationship between the units involved in Boyle's law is one of the exponential Decay

Explanation:

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We can see here that the best fuel is the one that produces the most heat per unit mass. In this case, the fuel that produces the most heat per unit mass is methanol.

Fuel is a substance that is used to produce energy through combustion or other chemical reactions. It is commonly utilized to power various forms of transportation, generate heat or electricity, and operate machinery and appliances.

The results of the experiment are shown below:

Fuel            Mass (g)      Heat produced (J)       Heat per gram (J/g)

Methanol 1.0                          350                   350

Ethanol         1.0                          250                   250

Propane         1.0                          200                   200

Butane         1.0                          150                            150

Pentane         1.0                          100                            100

It is important to note that the results of this experiment are only a measure of the heat produced by the fuels.

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For the bronze figure that has a volume of 225 mL and a density of 7.8g/ml , the number of ounces of bronze needed in the preparation of the bronze figure by the sculptor is 62.6113 ounces

By using the formula,

ρ = [tex]\frac{M}{V}[/tex]

ρ = Density of the substance in g/ml

M = Substance's mass in g

V = Volume of the substance in ml

Given,

volume of  bronze figure = 225 mL

density of  bronze figure  = 7.8 g/mL

then, the mass of the bronze required to make the bronze  figure in grams

                  = density of  bronze figure ×  volume of   bronze figure    

                  =   7.8 g/mL  ×   225 mL  

                  =    1775 g

1 gram = 0.035274 ounce

then, the mass of the bronze required to make the bronze  figure in ounces,

= 1775 × 0.035274

= 62.6113 ounces

Therefore, the number of ounces of bronze needed in the preparation of the bronze figure by the sculptor  is 62.6113 ounces

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Answer:

1 and 2 are identical

Explanation:

Draw zigzag project

Answer:

Certainly! Here are three reasons why glass apparatus are still widely used in laboratory experiments, despite the fact that they can break easily:

1. Transparency: One of the key advantages of glass apparatus is that it is transparent, allowing researchers to easily observe the chemical reactions and physical changes that are taking place inside. This is particularly important in experiments where the color or appearance of the reaction is important to understanding the underlying chemistry.

2. Inertness: Glass is also relatively inert, meaning that it does not react chemically with most substances. This makes it an ideal material for storing and handling chemicals, as it minimizes the risk of contamination or unwanted side reactions. Additionally, glass is non-porous, which means that it will not absorb or release chemicals, further reducing the risk of contamination.

3. Versatility: Glass is a versatile material that can be molded into a wide range of shapes and sizes, making it suitable for a variety of laboratory applications. Glass apparatus can be designed to withstand high temperatures and pressures, making them ideal for use in experiments that involve heat, pressure, or corrosive chemicals. Additionally, glass can be easily sterilized, making it a good choice for experiments that require a sterile environment.

Answer:

Glass is resistant to high temperatures and many strong chemicals. Also, it is transparent, so you can see reactions as they occur.

Explanation:

Glass is nonreactive, so it is useful for a wide variety of laboratory purposes. The added benefit of being able to see through it clearly makes glass a great chose for apparatuses.

To solve for x, we will substitute the given values into the equation and perform the calculations:

x = (4.3 × 10^3 M^−2 s^−1) (0.45M)^3

First, let's simplify the expression (0.45M)^3:

(0.45M)^3 = (0.45)^3 * M^3

= 0.091125 * M^3

Now we substitute this value back into the original equation:

x = (4.3 × 10^3 M^−2 s^−1) * (0.091125 * M^3)

Next, we simplify the expression (4.3 × 10^3 M^−2 s^−1) * (0.091125 * M^3):

x = (4.3 × 10^3) * (0.091125) * M^(-2 + 3) * s^(-1)

= (4.3 × 10^3) * (0.091125) * M^1 * s^(-1)

= 391.875 * M * s^(-1)

Thus, the simplified expression for x is:

x = 391.875 * M * s^(-1)

Please note that the unit of x is Molar per second (M/s) since we have multiplied M with s^(-1).

If anyone adds 1.65 L of water to 112 grams of sodium acetate) to get 1697 ml of solution. Then, the percent mass by volume (% m/v) of sodium acetate in this solution is 6.59.

The percent mass by volume (% m/v) of sodium acetate in the solution is calculated as below,

the volume of water added to the solution from liters (L) to milliliters (ml): 1.65 L = 1650 ml

mass of sodium acetate by the volume of the solution:

mass of sodium acetate = 112 g

volume of solution = 1697 ml

mass/volume (g/ml) = 112 g / 1697 ml

The % mass by volume (% m/v) by multiplying the mass/volume by 100:

% m/v = (mass/volume) × 100

Here, % m/v = (112 g / 1697 ml) × 100 = 6.59.

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250 L of 5.0% w/v glucose solution can be prepared using 125 g of glucose.

w/v = [ mass of solute (g) / volume of solution (mL) ] × 100

5.0 % w/v = [ 125 g / volume of solution (mL) ] × 100

volume of solution (mL) = [ 125 g / 5.0 % w/v ] x 100

volume of solution (mL) = [ 125 g / (5.0 / 100) ] x 100

volume of solution (mL) = [ 125 g / 0.05 ] x 100

If 100 s of heat is added to a system and 0.100 ks of work is done by the system, then the value of ΔE or DE (change in internal energy) is 200 J, which is in option A. This is as per the first rule of thermodynamics.

ΔE = Q - W

ΔE (change in internal energy)

Given that 100 J (joules) of heat is added to the system (Q = 100 J) and 0.100 kJ (kilojoules) of work is done by the system (W = -0.100 kJ), we need to ensure that the units are consistent.

Since 1 kJ = 1000 J, we can convert the work done to joules:

W = -0.100 kJ = -0.100 × 1000 J = -100 J

Now one can substitute the values into the equation:

ΔE = Q - W

= 100 J - (-100 J)

= 100 J + 100 J

= 200 J

Therefore, the value of ΔE (change in internal energy) is 200 J.

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complete question is below

if 100s of heat is added to a system and 0.100ks of work is done by the system, what is the value of DE​

A. 200 j

B.50 j

C.2 j

D. 10000j

Answer:

Thomas Elva Edison invented the bulb.

Explanation:

He tried for about 9999 times to invent it but due to his hard work he succeded in inventing the light bulb in the 10000 try.

Answer: Booting up the computer: When you turn on the computer, it requires a burst of energy to start up the various components and initialize the operating system.

Explanation:

Answer:

hydrochloric acid

Explanation:

chemical compound any substance composed of identical molecules consisting of atoms