1. a 50.0 ml sample of 0.150 m hcl is titrated with 0.200 m naoh. calculate the ph after 20.0 ml of base have been added

The given statement "A hot plate is the only heat source available in the lab room to heat the hydrate in a crucible at least 2 times for 10-15 minutes at medium-high setting" is true because the water in hydrate can be removed by heating.

The crucible is the type of the laboratory glassware that is designed to melt or to burn the solid chemicals over the burner. Crucible is made from the heat resistant ceramic or the metal. The hot plates are the laboratory tools that is used for the  uniformly heat the samples. The hot plates are available with Varity of the  number of the different heating top styles.

Thus, the hot plate is the heating tool to heat the hydrate in the crucible.

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The ammonium nitrate concentration in the resulting solution is 0.08 M.

The molarity and volume are related to each other by the formula -

\( M_{1}\) \( V_{1}\) = \( M_{2}\) \( V_{2}\), where values at Left Hand Side are initial concentration and volume and values are Right Hand Side are final concentration.

Keep the values in formula to find final concentration.

0.467 × 50 = \( M_{2}\) × 290

Performing multiplication in the equation

\( M_{2}\) = 23.35 ÷ 290

Performing division on Right and Side of the equation

\( M_{2}\) = 0.08 M

Thus, the final molarity is 0.08 M.

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Combustion is a chemical process in which a substance reacts rapidly with oxygen and gives off heat. The original substance is called the fuel, and the source of oxygen is called the oxidizer. The fuel can be a solid, liquid, or gas, although for airplane propulsion the fuel is usually a liquid. HoPe iT doSe WhaT EvEr U nEed IT foR hUmAn

Answer:

112mL

Explanation:

We'll begin by calculating the number of mole in 0.640g of SO2.

This is illustrated below:

Molar mass of SO2 = 32 + (16x2) = 64g/mol

Mass of SO2 = 0.640g

Number of mole of SO2 =.?

Mole = mass /molar mass

Number of mole of SO2 = 0.640/64

Number of mole of SO2 = 0.01 mole

Next, we shall determine the number of mole of O2 required for the reaction. This is illustrated below:

2SO2(g) + O2(g) —> 2SO3(g)

From the balanced equation above,

2 moles of SO2 reacted with 1 mole of O2.

Therefore, 0.01 mole of SO2 will react with = (0.01 x 1)/2 = 0.005 mole of O2.

Therefore, 0.005 mole of O2 is required for the reaction.

Finally, we shall determine the volume of O2 required for the reaction as follow:

Note: 1 mole of a gas occupy 22.4L (22400mL) at stp.

1 mole of O2 occupy 22400mL at stp.

Therefore, 0.005 mole of O2 will occupy = 0.005 x 22400 = 112mL

Therefore, 112mL of O2 is required for the reaction.

Answer:

the answer is C

Explanation:

i did the test on edg and got it right

To get a dose of 0.1 gm (100 mg), 1.5 ml of sodium amytal solution must be injected intramuscularly (IM).

We can use the available concentration and the desired dose.

Given

First, we need to convert the desired dose from grams to milligrams:

0.1 g = 100 mg

Now, we can set up a proportion to find the volume of solution needed:

(100 mg) / (200 mg) = (x ml) / (3 ml)

Cross-multiplying and solving for x:

100 mg * 3 ml = 200 mg * x ml

300 mlmg = 200 mlmg

x ml = (300 ml*mg) / (200 ml)

x ml = 1.5 ml

So, To get a dose of 0.1 gm (100 mg), 1.5 ml of sodium amytal solution must be injected intramuscularly (IM).

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Answer:

Below

Explanation:

2 H2  + O2  ====>      H20      you have 4 H's on L...need 4 on right so:

2H2  + O2 =====>  2 H2 O      Now H's are 'balanced' and a check of the O's  shows they are balanced too (two O's on each side)

Answer:

113.17 g

Explanation:

This can be solved using the Ideal Gas Equation:

PV=nRT

First step is to calculate the volume of the cylinder in L:

V=πr²h

V= π (11.5)² (140)

V= π (132.25) (140)

V = π (18.515)

V = 58,166.588 cm³ = 58.2 L

Then, convert kpa into atm:

1 kpa = 0.00987 atm

108 kpa = 1.06588 atm

Then, plug all of your values into the Ideal Gas Equation to solve for moles:

(1.06588)(58.2)=n(0.082057)(294)

62.034=n(24.125)

2.571357513=n

Finally, convert the moles into grams

2N = 28.0134 amu

O = 15.999 amu

_______________

44.0124 amu

(2.571357513moles)(44.0124 amu) = 113.17 g

Answer:

a molecule of an element is called atomicity

To rank the following amines in order of decreasing base strength: NH₃ > (CH₃)₂NH > CH₃NH₂ > NH₂Br.

The order of base strength is determined by the availability of the lone pair of electrons on the nitrogen atom, which can be donated to form a bond with a proton (H⁺).

NH3 has the highest base strength because it has the most electron-donating groups (three hydrogens) attached to the nitrogen atom, making the lone pair of electrons more available.

(CH₃)₂NH is the next strongest base because it also has two electron-donating methyl groups attached to the nitrogen atom.

CH₃NH₂ has only one electron-donating methyl group, so it is weaker than (CH₃)₂NH.

NH₂Br is the weakest base because the electronegative bromine atom withdraws electron density from the nitrogen atom, making the lone pair of electrons less available.

Therefore, the correct ranking from strongest to weakest base is:

NH₃ > (CH₃)₂NH > CH₃NH₂ > NH₂Br.

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Based on the calculations, the Gibbs's free energy and spontaneity of the phase change are equal to: C. ΔG° = 3.1 kJ; spontaneous.

Given the following data:

Mathematically, the Gibbs's free energy for this chemical reaction can be calculated by using this formula:

ΔG° = ΔH° - ΔS°

Substituting the given parameters into the formula, we have;

ΔG° = 31 × 10³ - (300 × 0.093)

ΔG° = 31 × 10³ - 27.9 × 10³

ΔG° = 3.1 kJ.

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The new volume of the gas wii be 4.7 liters.

The number of quarts of 5% solution that can be made from 4.73 grams of the drug is 100 quarts.

To calculate the number of quarts of 5% solution that can be made from 4.73 grams of the drug, we need to use the formula that relates the amount of drug to the concentration and volume of the solution. Let's first convert the drug quantity to grams. Since 1 gram is equivalent to 1000 milligrams, then:

4.73 grams = 4730 milligrams

Now, let's plug in the values into the formula and solve for the volume of the solution.

Amount of drug (in grams) = Concentration (as a decimal) × Volume of solution (in milliliters)

To convert milliliters to quarts, we will divide the volume by 946.35 (1 quart = 946.35 milliliters). So we have:

4730 mg = 0.05 × Volume of solution (in milliliters)

Volume of solution = 4730 ÷ 0.05 = 94,600 milliliters (ml)

Number of quarts of solution = 946.35 = 100 quarts (rounded to the nearest whole number).

Therefore, 100 quarts of 5% solution can be made from 4.73 grams of the drug.

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Answer:

CH³–C=CH——CH³–CH=CH²

Explanation:

THIS IS PROPYNE TO PROPENE

Answer:

The reactants are on the left of the arrow, the products are on the right.

Explanation:

Reactants are the substances that exist before the chemical reaction takes place. When writing a chemical reaction or equation, they are found on the left of the arrow. They react to form new substances, which are known as the products. The products are found to the right of the arrow in the reaction.

The glyceryl trioleate (triolein) acid hydrolysis equation calls for the interaction of the triglyceride with an acid, often a powerful acid like hydrochloric acid (HCl).

The triglyceride is converted into its component fatty acids and glycerol during this process. For triolein, a particular triglyceride made up of three oleic acid molecules esterified to a glycerol molecule, the equation is as follows:

C₅₇H₁₀₄O₆ + 3H₂O + 3HCl → 3C₁₇H₃₃COOH + C₃H₈O₃

In this equation:

C₅₇H₁₀₄O₆ represents the glyceryl trioleate (triolein) molecule.

3H₂O represents three water molecules, which are needed for the hydrolysis reaction.

3HCl represents three molecules of hydrochloric acid, which serve as the catalyst for the reaction.

3C₁₇H₃₃COOH represents the three oleic acid molecules released from triolein.

C₃H₈O₃ represents the glycerol molecule released from triolein.

Triolein undergoes acid hydrolysis when it reacts with hydrochloric acid, rupturing the ester bonds between the fatty acids and the glycerol molecule to produce the appropriate fatty acids and glycerol.

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The central atom in the icl4- ion has nonbonded electron pair(s) and bonded electron pair(s) in its valence shell is 2 and 4 respectively.

The central atom is generally the atom with the lowest subscript within the molecular system and the atom that may shape the maximum bonds. If all the atoms commonly shape an equally wide variety of bonds, the least electronegative atom is usually the critical atom.

A bonding electron is an electron concerned with chemical bonding. this could confer with: Chemical bond, a lasting appeal between atoms, ions, or molecules. A covalent bond or molecular bond is a sharing of electron pairs between atoms. A bonding molecular orbital is an attraction among the atomic orbitals of atoms in a molecule.

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Answer:

The three parts of the nucleotide building block of DNA are the sugar, the base and the phosphate.

Explanation:

Hope that helps!

Answer:

three parts of the nucleotide building block of DNA are the sugar, the base and the phosphate.

Answer:

Explanation:yo what is you talkin about

Radiocarbon dating, also known as carbon-14 dating, is a method used to determine the age of organic materials. It is based on the radioactive decay of the isotope carbon-14 (14C).

Living organisms constantly absorb carbon, including a small amount of carbon-14, from the atmosphere. When an organism dies, it no longer takes in carbon-14, and the existing carbon-14 begins to decay at a known rate. By measuring the ratio of carbon-14 to stable carbon isotopes (carbon-12 and carbon-13) in a sample, scientists can estimate the time that has elapsed since the organism's death. Radiocarbon dating is effective for dating materials up to about 50,000 years old.

Therefore, both radiocarbon dating and radiopotassium dating rely on the principles of radioactive decay. The decay rates of the isotopes used in these methods are well-established and constant, allowing for accurate age determinations.

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Answer:

radio waves

Explanation:

the answer is simple, radio waves. it is radio waves because when you look at the diagram the waves below Radio are very long. if you look at the waves under gamma ray, they are very short. radio is the longest wave while gamma is the shortest. if you are still confused it also says longer wavelength and low frequency( meaning it is safe) right under the wavelength.

The smallest angle, measured from the reflecting planes, at which constructive interference of an X-ray beam is observed is approximately 27.2 degrees.

To determine the smallest angle of constructive interference, we can use Bragg's Law, which states that constructive interference occurs when the path difference between two waves is equal to an integer multiple of the wavelength. The formula is given as:

2d sin(θ) = nλ

Where:

d is the distance between the reflecting planes (0.541 nm)

θ is the angle between the incident X-ray beam and the planes (the desired angle)

n is the order of the interference (we are considering the first-order, so n = 1)

λ is the wavelength of the X-ray beam (0.0649 nm)

Rearranging the formula, we get:

sin(θ) = (nλ) / (2d)

θ = arcsin((nλ) / (2d))

Plugging in the values, we have:

θ = arcsin((1 * 0.0649 nm) / (2 * 0.541 nm))

θ ≈ 27.2 degrees

Therefore, the smallest angle at which constructive interference is observed is approximately 27.2 degrees.

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When we convert 15 g of ice to volume in milliliters (mL), the result obtained is 15 mL (option C)

1 g = 1 mL

1 g is equivalent to 1 mL.

Therefore,

15 g will also be equivalent to 15 mL

Thus,

15 g = 15 mL

The correct answer to the question is 15 (Option C)

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Answer:

It's A) and E)

Explanation:

Did the assignment

Answer:

A. conversion of glycogen to glucose and

E. breakdown of ATP to form ADP

Explanation: I also did the assignment.

Answer: I think you're supposed to add the protons and neutrons and then that's your answer. Sorry if I'm wrong :/

Explanation:

Answer: The mass density is 1166.36 \(kg/m^{3}\).

Explanation:

Given: Weight of sample in air \((F_{air})\) = 500 N

Weight of sample in alcohol \((F_{alc})\) = 200 N

Specific gravity = 0.7 = \(0.7 \times 1000 = 700 kg/m^{3}\)

Formula used to calculate Buoyant force is as follows.

\(F_{B} = F_{air} - F_{alc}\\= 500 - 200 \\= 300 N\)

Hence, volume of the material is calculated as follows.

\(V = \frac{F_{B}}{\rho \times g}\)

where,

\(F_{B}\) = Buoyant force

\(\rho\) = specific gravity

g = acceleration due to gravity = 9.81

Substitute the values into above formula.

\(V = \frac{F_{B}}{\rho \times g}\\= \frac{300}{700 \times 9.81}\\= \frac{300}{6867}\\= 0.0437 m^{3}\)

Now, mass of the material is calculated as follows.

\(mass = \frac{F_{air}}{g}\\= \frac{500 N}{9.81}\\= 50.97 kg\)

Therefore, density of the material or mass density is as follows.

\(Density = \frac{mass}{volume}\\= \frac{50.97 kg}{0.0437 m^{3}}\\= 1166.36 kg/m^{3}\)

Thus, we can conclude that the mass density is 1166.36 \(kg/m^{3}\).

In the laboratory, hydrogen gas is used as fuel for various purposes, including heating. In order to start the heating process, it is necessary to allow the hydrogen gas to flow continuously for a while. This is because there may be air or other gases present in the hydrogen gas pipeline that can affect the heating process.

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Answer:

d. oxygen (O2) is the answer