calculate the molarity of a sodium hydroxide solution if 0.972 g of oxalic acid reacts exactly with 37.26 ml of the sodium hydroxide solution.

Answer:

huh I can't understand

Explanation:

what are your language bro

Answer:

In physics, a force is any interaction that, when unopposed, will change the motion of an object. A force can cause an object with mass to change its velocity (which includes beginning moving from a state of rest), i.e., to accelerate. Force can also be described intuitively as a push or a pull.

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Answer:

Because both the zones have different compositions.

Explanation:

The continental crust is composed of mainly graphite whereas the oceanic crust is made up of basalt. The oceanic plates are thinner than the continental plates. Also the oceanic plates are much denser as compared to the continental plates. Now the continental plates at the convergent boundary gained thickness as they are pushed upward. These plates or zones are of different composition an densities and so when they collide different features can be seen at the two conversion zones.

Non-pathogenic or “normal” crystals found in acidic urine include uric acid crystals and calcium oxalate crystals.

Urine is a liquid excretory product that is produced by the kidneys, stored in the bladder, and expelled from the body during urination. It's made up of water and various waste products that your body eliminates as part of its normal metabolic processes.

Crystals in urine are tiny, solid deposits that form in the kidneys and bladder. These crystals can clump together and form stones. The size of these crystals varies from a few micrometers to a few millimeters.

Crystals that occur naturally in urine and are not linked to any medical problem are called non-pathogenic crystals. Uric acid crystals and calcium oxalate crystals are two examples of these. These crystals can appear in both healthy and unhealthy individuals. In acidic urine, uric acid crystals and calcium oxalate crystals are common. Urine pH is used to classify the urine as acidic, alkaline, or neutral.

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In a spectrophotometry lab, the standard curve graph typically has the following axes:

X-axis: Concentration of the analyte (usually in units like mg/mL, μg/mL, or mM)
Y-axis: Absorbance (unitless) measured using a spectrophotometer

So, to label the graph, write "Concentration" along the X-axis and "Absorbance" along the Y-axis. This standard curve helps you determine the concentration of an unknown sample by comparing its absorbance with the curve generated from known concentrations.

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The characteristics which are necessary for a location to be suitable for chemical storage are:

Chemical storage as the name implies refers to the storage of controlled substances or hazardous materials as the case may be in chemical stores, chemical storage cabinets, or similar devices.

On this note, the characteristics which are necessary for a location to be suitable for chemical storage are as listed above.

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The characteristics required for suitable chemical storage include dark, dry, and cool.

In conclusion, the characteristics required for suitable chemical storage include dark, dry, and cool.

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Answer:

21

Explanation:9+10

Answer:

First 20 Elements

Atomic Number Element Symbol

17 Chlorine Cl

18 Argon Ar

19 Potassium K

20 Calcium Ca

The region that does not match its description is the fourth answer choice which is Abdominal region: spine

The cranial region encompasses the upper part of the head.

∴ The first answer choice matches its description.

The axillary region is an anatomical region under the shoulder joint where the arm connects to the shoulder. Therefore, it encompasses the armpits.

∴ The second answer choice matches its description.

The thoracic region runs from the base of the neck down to the abdomen. Therefore, it encompasses the chest

∴ The third answer choice matches its description

The abdominal region is divided into four quadrants which include are

1. Right upper quadrant fossa (RUQ)

2. Right lower quadrant fossa (RLQ)

3. Left lower quadrant fossa (LLQ)

4. Left upper quadrant fossa (LUQ)

It is also divided into nine (9) areas, all of which does not include the spine.

∴ The fourth answer choice does NOT match its description.

Hence, the region that does not match its description is the fourth answer choice which is Abdominal region: spine

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The most widely used gas welding process is D. Oxyacetylene welding.

Oxyacetylene welding involves the use of a fuel gas, which is acetylene, and an oxidizing gas, which is oxygen.

The two gases are mixed in the desired proportion and ignited to produce a flame with a high temperature. The flame is used to heat and melt the base metals, and a filler rod may be added to create a weld joint.

Oxyacetylene welding utilizes acetylene gas as the fuel gas and oxygen gas as the oxidizing gas. Acetylene gas is produced by the reaction of calcium carbide with water.

The acetylene and oxygen gases are supplied through separate hoses and are mixed in the correct ratio using a welding torch.

The mixed gases are ignited at the torch tip, creating a flame with a high temperature (up to 6,000 degrees Fahrenheit). The flame consists of two zones: the inner cone (called the reducing zone) and the outer cone (called the oxidizing zone).

The reducing zone provides a carbon-rich environment, which helps in preventing oxidation and maintaining the weld pool's cleanliness.

The high temperature of the flame is used to heat and melt the base metals being welded. The molten metal fuses together, forming a solid weld joint upon cooling.

During the welding process, a filler rod made of a compatible metal is often added to the weld pool to reinforce the joint or to provide additional material.

Oxyacetylene welding is versatile and can be used to weld various metals, including mild steel, stainless steel, cast iron, copper, and aluminum.

The process requires skill and control to achieve proper heat distribution, weld penetration, and joint integrity.

Overall, oxyacetylene welding is widely used due to its flexibility, portability, and versatility in welding various metals. I

t is commonly employed in industries such as automotive, construction, metal fabrication, and repair work.

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In an endothermic process, heat is a reactant. Exothermic means that the reaction mixture feels warm to the touch. Endothermic means that the reaction mixture feels chilly to the touch. The exothermic reaction produces heat as a byproduct.

When bonds in the reactants are broken in endothermic reactions, more energy is absorbed than is released when new bonds are created in the products. Endothermic refers to a process that takes in thermal energy (heat). The Greek words for "within heating" and "to heat" are represented by the prefix endo- and the suffix -thermic, respectively.

An endothermic response occurs when the temperature of the an isolated system decreases while the surroundings of the a non-isolated system warm up. In endothermic processes, the heat of reaction is typically positive (qrxn>0). Only when heat is absorbed do endothermic reactions like fusion, evaporation, or sublimation occur.

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Explanation:

Chemistry Teacher.

Chemical Engineer.

Forensic Scientist.

Geochemist.

Biochemists

Pharmacologist

Analytical Chemist

Envionmental chemist

Water Chemist

Catalysis

Molarity=Moles/Liter

0.1M solution=x moles NaCl/0.5L (since 1000mL is one liter)

Multiply both sides by 0.5 to isolate the variable x

x=0.05 moles of NaCl is needed to maintain that molarity.

Answer:

0.0500 mol

Explanation:

0.100 M solution means that 0.100 mol of NaCl are in 1L=1000 mL  solution.

(0.100 mol/1000 mL) * 500 mL = 0.0500 mol

True. Sodium is indeed a mineral element that is one of the principle positive ions, also known as cations, in the human body. It plays a crucial role in various bodily functions such as maintaining proper fluid balance, transmitting nerve impulses, and supporting muscle function.

Sodium can be found in a variety of foods, particularly in salt (sodium chloride), processed foods, and certain types of dairy products. However, it's important to consume sodium in moderation as excessive intake can lead to negative health effects such as high blood pressure and increased risk of cardiovascular disease.  True, sodium is a mineral element and is one of the principle positive ions.

Sodium is indeed a mineral element and is one of the principle positive ions, or cations, in our body. It plays a crucial role in maintaining proper fluid balance, nerve function, and muscle function. Sodium is an essential element that our body needs for various physiological processes. As a positive ion, it helps in maintaining the balance of fluids inside and outside our cells. Sodium also plays a critical role in transmitting nerve impulses and aiding muscle contractions.

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Answer:

4,186 joules

Explanation:specific heat, the quantity of heat required to raise the temperature of one gram of a substance by one Celsius degree. The units of specific heat are usually calories or joules per gram per Celsius degree. For example, the specific heat of water is 1 calorie (or 4,186 joules) per gram per Celsius degree.

The temperature scale most commonly used in the United States and its territories, as well as in a few other countries, is called Fahrenheit. However, in most countries around the world, the temperature scale used is called Celsius. Therefore, 18 degrees Celsius is equivalent to 64 degrees Fahrenheit

The formula to convert Celsius to Fahrenheit is:

F = (9/5)C + 32

Where F is the temperature in Fahrenheit and C is the temperature in Celsius.

To convert 18 degrees Celsius to Fahrenheit, we will plug in 18 for C in the formula above:

F = (9/5) * 18 + 32

Solving for F:

F = 32 + 32

F = 64

It's worth noting that the freezing point of water is 32°F (0°C) and the boiling point of water is 212°F (100°C) at standard atmospheric pressure. These reference points make it easy to convert between the two temperature scales.

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Water is a liquid while hydrogen sulphide is a gas because the hydrogen bonding in water causes the water molecules to be associated with each other due to intermolecular forces of attraction.

1. S orbitals: Two atomic orbitals overlap to create each bond.

2. p orbitals: In addition to s orbitals, p orbitals play a role in the synthesis of bonds.

3. D orbitals: In the majority of typical organic compounds, d orbitals don't contribute significantly to the formation of bonds.

4. Like d orbitals, f orbitals are not frequently used to create bonds in normal organic compounds.

Since you mentioned the molecule has 10 σ bonds, let's address parts 1-4 in terms of the specified orbitals:

1. s orbitals: Each σ bond is formed by the overlapping of two atomic orbitals. Since there are 10 σ bonds, there are 20 atomic orbitals involved. Of these, 2 are s orbitals, as hydrogen atoms typically contribute an s orbital to form σ bonds.

2. p orbitals: In addition to the s orbitals, p orbitals also contribute to σ bond formation. Since we've already identified 2 s orbitals, there are 18 remaining orbitals which are p orbitals.

3. d orbitals: In most common organic molecules, d orbitals do not play a significant role in forming σ bonds. For this molecule with 10 σ bonds, we can assume there are no d orbitals involved in forming these bonds.

4. f orbitals: Similar to d orbitals, f orbitals are not commonly involved in forming σ bonds in typical organic molecules. For this molecule with 10 σ bonds, we can also assume there are no f orbitals involved.

To sum up, in a molecule with 10 σ bonds, there are 2 s orbitals, 18 p orbitals, and no d or f orbitals involved in bond formation.

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Answer:

\(5.1 \div 5.63\)

Answer:

c Two hydrogen one oxygen

Explanation:

H2O

The rotational kinetic energy of the person after the changing of its moment of inertia will become half of his initial rotational kinetic energy.

According to the law of conservation of angular momentum, the angular momentum before and after the change of moment of inertia should remain same system is unaffected by any external force.

So, we can write,

Initial angular momentum = final angular momentum

IW = iw

Where,

I is the initial moment of inertia,

W is the initial angular velocity,

i is the final moment of inertia,

w is the final angular velocity.

Now, putting all the values,

IW = 2I(w)

w = W/2

The final angular velocity is half of the initial angular velocity.

We know that the rotational kinetic energy of a body is given by.

E = 1/2IW²

If E is the initial rotational kinetic energy then the final rotational kinetic energy E' will be,

E' = 1/2I(w)²

Putting the values,

E' = 1/2I(W/2)²

E' = E/2

So, the final rotational kinetic energy of the person after the change will be the half of his initial rotational kinetic energy.

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The concentration of fluoroacetic acid in a solution is \(5.69*10^-^3M .\)

What is dissociation of acids?

In an aqueous  solution, an acid dissociates into hydrogen ions (H+) and anions. The molecules of a strong acid dissociate, resulting in a high concentration of H+.

It is calculated by:

Ka = \(\frac{[A^-][H^+]}{[H^+]}\)

The dissociation of HCl is given as follows:

HCl ⇄ \(H^+\) + \(Cl^-\)

The concentration of H+ ion = 0.00275 M.

So,

pH = -log\([H^+]\)

pH =  -log\([0.00275M]\)

pH = 2.56

According to question

pH of HCl = pH of fluoroacetic acid

The dissociation of fluoroacetic acid is given as follows:

\(FCH^2COOH\) ⇄ \(FCH_2COO^-\) + \(H^+\)

Ka = \(\frac{[FCH^2COO^-][H^+]}{FCH^2COOH}\)

pKa = -log [Ka]

2.59 = -log [Ka]

Ka = \(2.57*10^-^3\)

According to ICE table:

            \(FCH^2COOH\) ⇄ \(FCH_2COO^-\) + \(H^+\)

I                        C               0                       0

C                      -x               +x                     +x

E                     C-x               x                        x

According to the equation:

Ka = \(\frac{[FCH^2COO^-][H^+]}{FCH^2COOH}\)

\(2.57*10^-^3\) = \(\frac{x.x}{C-x}\)

\(2.57*10^-^3\) = \(\frac{x^2}{C-x}\)

x = 0.00275M

\(2.57*10^-^3\) = \(\frac{0.00275^2}{C-0.00275}\)

Solving for C,

C = 0.00569M or  \(5.69*10^-^3M .\)

The concentration of fluoroacetic acid in a solution is \(5.69*10^-^3M .\)

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Answer

1.0 mol

Explanation

Given:

Volume, V = 5.0 L

Temperature, T = 215 K

Pressure, P = 342 kPa

The gas constant, R = 8.31 L kPa/mol K

What to find:

The number of moles of the gas sample.

Step-step-solution:

The number of moles of the gas can be determine using the ideal gas equation formula:

Put the given values into the formula and calculate for n:

The number of moles of the gas sample is 1.0 mol.

About 0.25 liters of 6.0 m solutions of HCl should be added to create 2.0 liters of a 0.75 m HCl solution.

Lowering a solute's concentration in a solution is the process of dilution. It entails adding significantly additional water or solvent to the solution. When more solvent is added to a solution without extra solute, the solution gets diluted.

The dilution formula is  M₁V₁=M₂V₂. Here, M₁ is the initial molarity, M₂ is the final molarity, V₁ is the initial volume, and V₂ is the final volume.

Given, M₁ is 6.0 M, M₂ is 0.75 M, and V₂ is 2.0 L. We have to find V₁.

\(\begin{aligned}V_1&=\frac{M_2V_2}{M_1}\\&=\frac{0.75\times2}{6}\\&=\mathrm{0.25\; L}\end{aligned}\)

The answer is 0.25 L.

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The appropriate method for removing a solvent depends on several factors. The following answers are correct; volume of solvent being evaporated, volatility of the solvent, the hazards associated with the solvent, and the thermal stability of the product. Option A, C, E, and F are correct.

If a large volume of solvent needs to be removed, then a rotary evaporator or distillation may be necessary. For smaller volumes, a simple evaporation may be sufficient.

Solvents with high volatility can be removed by simple evaporation or with the help of a vacuum. Solvents with low volatility may require techniques such as rotary evaporation or distillation.

If the solvent is hazardous or toxic, special precautions such as fume hoods or closed systems may be necessary.

If the product is sensitive to heat, then techniques such as vacuum or freeze-drying may be necessary to remove the solvent.

Hence, A. C. E. F. is the correct option.

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Answer:

t=1855.45 C

Explanation:

m=0.13kg t1=200C H=900000J  Cp=4182J/kgC

h=m*cp*change in temperature

900*10^3=0.13*4182*(T-200)

1655.45=t-200

t=1855.45 C

Answer:

1. 2.17 dm^3

2. 109.1 dm^3

3. 0.398 atm

Explanation:

1. Considering the equation of the reaction;

Number of moles of chlorine gas in 3.44 g= 3.44/2(35.5)= 0.0485 moles

Since we can see from the equation that

1 mole of chlorine gas yields 2(22.4) dm^3 of HCl

0.0485 moles of chlorine gas yields 0.0485 moles × 2(22.4)dm^3/1= 2.17 dm^3

2. Note that 1 mole of Kr occupies 22.4 dm^3

Therefore 4.87 moles of Kr will occupy 4.87 × 22.4 dm^3/1 = 109.1 dm^3

3. From PV= nRT

n= 0.0485 moles

V= 4.55 L

T= 455 K

P= the unknown

R= 0.082 atm dm^3K-1mol-1

P= nRT/V

P= 0.0485 moles × 0.082 atm dm^3K-1mol-1 × 455/4.55

P= 0.398 atm

Answer:

1) volume of HCl = 2.17 L HCl

2) volume of Kr = 109.09 L

3) Pressure of HCl = 0.796 atm

Explanation:

Step 1: Data given

Mass of Cl2 : 3.44 grams

Molar mass Cl2 = 70.9 g/mol

STP = 1atm and 273 K

Step 2: The balanced equation

H2(g) + Cl2(g) → 2HCl(g)

Step 3: Calculate moles of Cl2

Moles Cl2 = mass/ molar mass Cl2

Moles Cl2 = 3.44 grams / 70.9 g/mol

Moles Cl2 = 0.0485 moles

Step 4: Calculate moles HCl

For 1 mol H2 we need 1 mol Cl2 to produce 2 moles HCl

For 0.0485 moles Cl2 we'll have 2*0.0485 = 0.097 moles HCl

Step 5: Calculate volume of HCl

For 1 mol we have 22.4 L

For 0.097 moles we have 22.4 * 0.097 = 2.17 L HCl

Step 1: Data given

Moles of Kr = 4.87 moles

STP = 1 mol, 1atm and 273 K and 22.4 L

Step 2: Calculate volume at STP

1 mol has a volume of 22.4 L

4.87 moles has a volume of 22.4 L * 4.87 = 109.09 L

Step 1: Data given

Mass of Cl2 : 3.44 grams

Molar mass Cl2 = 70.9 g/mol

Volume = 4.55 L

Temperature = 455 K

Step 2: The balanced equation

H2(g) + Cl2(g) → 2HCl(g)

Step 3: Calculate moles of Cl2

Moles Cl2 = mass/ molar mass Cl2

Moles Cl2 = 3.44 grams / 70.9 g/mol

Moles Cl2 = 0.0485 moles

Step 4: Calculate moles HCl

For 1 mol H2 we need 1 mol Cl2 to produce 2 moles HCl

For 0.0485 moles Cl2 we'll have 2*0.0485 = 0.097 moles HCl

Step 5: Calculate pressure of HCl

p*V = n*R*T

⇒with p = the pressure of HCl = TO BE DETERMINED

⇒with V = the volume = the volume of HCl = 4.55 L

⇒with n = the moles of HCl = 0.097 moles

⇒with R = the gas constant = 0.08206 L*atm/mol*K

⇒with T = the temperature = 455 K

p = n*R*T / V

p = (0.097 moles * 0.08206L*atm/mol*K * 455 K) / 4.55 L

p = 0.796 atm

Ethanol is proven to reduce combustion emissions. Hydrogen can produce more energy per pound of fuel.

A chemical reaction involving two or more chemicals, generally including oxygen, that produces light and heat in the form of a flame.

The pace which the reactants mix is fast, due in part to the structure of the chemical process and in part to the fact that more energy is created than can escape through into surrounding medium. Ethanol is proven to reduce combustion emissions. Hydrogen can produce more energy per pound of fuel.

Therefore, ethanol is proven to reduce combustion emissions. Hydrogen can produce more energy per pound of fuel.

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