50.0 ml of 0.100 m acetic acid (ch3cooh (aq)) is titrated with 0.200 m naoh (aq). the ka of acetic acid is 1.74 × 10−5.

Answer:

intermolecular forces are very strong

The equation that represents a single replacement reaction given the various options is 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) (option 2)

A single replacement reaction, also known as single displacement reaction is a reaction in which elements higher in the electro-chemical series displace or replace elements lower in the electro-chemical series displace from a solution.

The following example illustrates single replacement reaction:

A + BC -> AC + B

From the above reaction, we can see that A has replace/displace B to from AC.

With the above information, we can determine the equation that represents single replacement reaction. Details below:

Equation from the questions:

From the above, we can see that only 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) conform to single replacement reaction.

Thus, the correct answer to the question is: 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) (option 2)

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Answer:

Polar covalent bond

Explanation:

When the electronegativity difference between two elements A and X is 0.8, the bond AX formed will most likely be a polar covalent bond.

A polar covalent bond is one whose electronegativity difference is between 0.5 and 2.1.

In such a bond type, we have heteronuclear species with one of the species having a higher electronegativity value.

Molecules in 4 moles of glucose are 24.088x10²³.

We need to find the number of molecules by applying the concept of moles

number of moles(n)= Number of Molecules(N)/Avogadro's Number(Nₐ)

n=N/Nₐ

4=N/6.022x10²³

N=24.088x10²³

Therefore, the number of molecules in 4 moles of Glucose is 24.088x10²³.

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It is important to use the same solvent for the rinse as for the recrystallization process to ensure the maximum recovery and purity of the solid product.

When isolating the solid after recrystallization using vacuum filtration, the solvent used to aid in the rinse from the Erlenmeyer flask to the vacuum filter funnel should be the same solvent used in the recrystallization process. This is because the solvent should be a good solvent for the solid being purified, so it can dissolve the impurities and allow them to be removed from the solid during the recrystallization process. Using a different solvent for the rinse could dissolve some of the solid product, reducing the yield and purity of the final product.

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a. 1,4332 g

b. 7.54~g

Given

Reaction

MgCl2 (s) + 2 AgNO3 (aq) → Mg(NO3)2 (aq) + 2 AgCl (s)

20 cm of 2.5 mol/dm^3 of MgCl2

20 cm of 2.5 g/dm^3 of MgCl2

Required

the mass of silver chloride - AgCl

Solution

a. mol MgCl2 :

\(\tt 20~cm^3=20\times 10^{-3}~dm^3\\\\mol=M\times V\\\\mol=2.5~mol/dm^3\times 20\times 10^{-3}DM^3=0.05\)

From equation, mol AgCl = 2 x mol MgCl2=2 x 0.05=0.1

mass AgCl(MW=143,32 g/mol)= 0.1 x 143,32=1,4332 g

b. mol MgCl2 (MW=95.211 /mol):

\(\tt mol=M\times V\\\\mol=\dfrac{2.5~g/dm^3}{95,211 g/mol}=0.0263~mol/dm^3\)

From equation, mol AgCl = 2 x mol MgCl2=2 x 0.0263=0.0526

mass AgCl(MW=143,32 g/mol)= 0.0526 x 143,32=7.54~g

Answer:

c

Explanation:

Answer: 63.55

Explanation:

The attached chart shows the calculation.  The orange line points to the % abundance of Cu-65, which is the difference of 100% less the % Abundance of Cu-65 (since there are only 2 isotopes).

The weighted average contribution of each istope is calculated (blue arrow) and then summed to find the atomic mass of copper.

The new volume of the balloon will be determined by the Ideal Gas Law.

The Ideal Gas Law is a mathematical equation used to describe the behavior of an ideal gas under a given set of conditions. It states that, at a constant temperature and pressure, the pressure, volume and amount of gas present are all directly proportional.

This law states that the product of the pressure, volume, and temperature of a gas is a constant.
Since the pressure of the balloon remains constant, the new volume is inversely proportional to the temperature.
Therefore, the new volume can be calculated by dividing the original volume (13.5 liters) by the ratio of the original temperature (248 K) to the new temperature (324 K),
which is 248/324 = 0.76.
The new volume of the balloon is then 13.5 liters / 0.76 = 17.76 liters.

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Answer:

Hope.

Gravity, weak force, electromagnetism, strong force are the four fundamental forces of nature.

The one that is not governing the natural universe is hope. The correct option is C.

The universe and all of its naturally occurring phenomena, as well as all of the physical laws that govern them.

The universe is almost entirely made up of dark energy, dark matter, and ordinary matter.

Other contents include electromagnetic radiation which is estimated to account for 0.005% to close to 0.01% of the universe's total mass-energy and antimatter.

Gravitational force, weak nuclear force, electromagnetic force, and strong nuclear force are the four fundamental forces of nature.

The strong nuclear force, also known as the strong nuclear interaction, is the most powerful of nature's four fundamental forces.

Gravitational force, the weakest of the four forces, has a relative strength of 10 to the minus 40.

Thus, the correct option is C.

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Answer:

(CH3COO)2 + redP + Cl2 → ClCH2COOH + HCl

Explanation:

This is an example of halogenation of carboxylic acids at alpha carbon atom. In this reaction, red phosphorus and chlorine are treated with carboxylic acids having alpha hydrogen atom followed by hydrolysis to form alpha chloro carboxylic acid.

When the umbilical cord is tied after birth, the umbilical arteries close by filling in with connective tissue. The umbilical arteries carry deoxygenated blood from the fetus to the placenta, where the blood is oxygenated and returned to the fetus via the umbilical vein.

When the umbilical cord is cut, the flow of blood from the placenta to the fetus ceases, and the umbilical arteries and vein begin to constrict. This constriction is caused by the contraction of smooth muscles in the vessel walls and the closure of small valves within the vessels. As the umbilical arteries constrict, the flow of blood to the placenta decreases and the vessels begin to fill in with connective tissue. Over time, the connective tissue replaces the smooth muscle and valve tissue in the vessel walls, resulting in the complete closure of the umbilical arteries. This process is important to prevent bleeding and infection in the newborn.

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The way in which temperature leads to weathering of rocks is as follows: Rocks expand and contract when they are heated and cooled which cause them to break (option C).

Rock weathering is the mechanical or chemical breaking down of rocks in situ by weather or other causes.

Once a rock has been broken down, a process called erosion transports the bits of rock and minerals away. Water, acids, salt, plants, animals, and changes in temperature are all agents of weathering and erosion.

Changes in temperature cause rock to expand (with heat) and contract (with cold). As this happens over and over again, the structure of the rock weakens. Over time, the rock crumbles.

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Answer:

3. Bacteria

Explanation:

If you don't trust me, search it up!

Answer:

Based off of the 'so', this is not an actual question. This is a mix of math and chem.

But if you come up with a punchline... It's a joke!

Explanation:

2Al(OH)3 + 3H2SO4 --> Al2 (SO4)3 + 6H2O

The atomic mass of element X is approximately 69.969 amu. To find the atomic mass of element X, we need to take into account the mass and natural abundance of its isotopes.

Let's calculate the atomic mass using the formula:

Atomic mass = (mass of isotope 1 * natural abundance of isotope 1) + (mass of isotope 2 * natural abundance of isotope 2) + ...

Given:
Mass of isotope X-69 = 68.7256 amu
Natural abundance of isotope X-69 = 50.11%
Mass of isotope X-71 = 70.98 amu

Plugging in the values into the formula:

Atomic mass of X = (68.7256 amu * 50.11%) + (70.98 amu * (100% - 50.11%))

Simplifying:

Atomic mass of X = (34.413 amu) + (35.556 amu)
Atomic mass of X = 69.969 amu

Therefore, the atomic mass of element X is approximately 69.969 amu.

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Answer:

The correct answer to this question is a prokaryotic cell.

Explanation:

Prokaryotes have circular DNA and a cell wall, whereas eukaryotes have their DNA packaged into chromosomes and may not have a cell wall (as is the case in animal cells).

Hope this helps!

A sample of ethane that contains 2.71 x \(10^{24\) atoms of carbon at STP will have a 50.4 liters volume of ethane.

At STP, 1 mole of gas = 22.4 liters. Also, 1 mole of substances contains 6.02 x \(10^{23\) atoms of the substances.

1 mole of ethane, \(C_2H_6\), contains 2 moles of carbon atoms and 6 moles of hydrogen atoms.

2.71 x \(10^{24\) atoms of carbon =  2.71 x \(10^{24\) /6.02 x \(10^{23\)  

                                              = 4.50 mols of carbon

2 moles of carbon = 1 mole of ethane

4.50 moles of carbon = 4.50x1/2

                                    = 2.25 moles

1 mole of ethane = 22.4 liters

2.25 moles of ethane = 22.4 x 2.25

                                    = 50.4 liters

In other words, the total volume of ethane in a sample that contains 2.71 x \(10^{24\) atoms of carbon at STP would be 50.4 liters.

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Answer:

True

Explanation:

Any substance dissolving a solid (salt) in liquid (water) is a physical change.

Salt in water, is a physical change because only the state of the matter has changed.

Answer:

true

Explanation:

uwu

The correct option is d. 2, The coefficient of OH- when the given reaction is balanced in basic solution is 2.

To balance the equation in basic solution, we need to consider the presence of OH- ions. In the given reaction, Cl- and H2O are the reactants, and Cl2 and H2 are the products. To balance the chlorine atoms, we need 2 Cl- ions on the left side. To balance the hydrogen atoms, we need 2 H2O molecules, which will produce 2 H2 molecules.

However, in basic solution, we also need to balance the charge by adding OH- ions. Each OH- ion carries a negative charge, so we need to add 2 OH- ions on the right side of the equation. This balances the charge on both sides and ensures that the reaction is balanced in basic solution.

Therefore, the balanced equation in basic solution is:

2 Cl- + 2 H2O → Cl2 + 2 H2 + 2 OH-

From this equation, we can see that the coefficient of OH- is 2. Thus, the correct answer is d. 2.

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Answer:

The rate of a chemical reaction is defined as the rate of change in concentration of a reactant or product divided by its coefficient from the balanced equation.

(1)The mass of salt in the 400-gram sample of saltwater is 6 grams. (2)The concentration of the solution is:

Concentration = 0.0059 g/mL

(1)To determine the mass of salt in a 400-gram sample of saltwater that is 1.50% (w/w), we need to calculate 1.50% of the total mass(molarity).

Mass of salt = 1.50% of 400 g

Mass of salt = (1.50/100) × 400 g

Mass of salt = 6 g

Therefore, the mass of salt in the 400-gram sample of saltwater is 6 grams.

(2)To calculate the concentration of the solution prepared by dissolving 2.04 grams of NH₄Cl in enough water to make 345.0 mL of solution, we need to use the formula:

Concentration (in g/mL) = Mass of solute (g) / Volume of solution (mL)

Concentration = 2.04 g / 345.0 mL

Concentration = 0.00591 g/mL

Since the question asks for the concentration, we need to round the answer to the appropriate number of significant figures based on the given data. In this case, the given mass of NH₄Cl has 3 significant figures, and the volume of the solution has 4 significant figures. Therefore, the concentration of the solution is:

Concentration = 0.0059 g/mL

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Answer:

Magnetism

Explanation:

The iron fillings would be magnetic therefore using a magnet would be the simplest way to separate the two.

When we do the respective division operation we get the following result 0.171802.

When we do the respective division operation we get the following result 0.171802. But we must adjust the significant figures taking into account the number that has less significant figures, which is 5.68.

5.68 has three significant figures. So we will adjust the significant figures of the result to three.

0.97584 / 5.8 = 0.1718 = 0.172

Answer:

C

Explanation:

Temperature, humidity, and pressure are all the same through an air mass.

By nature, unpolluted rainfall has a pH of between 5.0 and 5.6. Thus, option (b) is the correct answer.

Unpolluted rain refers to natural rain that is unaffected by pollution in the air and water. Such rain is not devoid of particulate matter but has particulate matter such as soil particles present.

Unpolluted rain is also known as clean rain. This rain is slightly acidic in nature as the carbon dioxide and rainwater react together to form carbonic acid. Carbonic acid is a weak acid that is responsible for the slight acidity of rainwater.

\(H_20+CO_2--- > H_2CO_3\)

If the pH falls down below 4.4, the rain is said to be acid rain.

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As charges fluctuate over time, a nonpolar molecule is one whose average charge distribution is spherically symmetric.

In a so-called nonpolar molecule, a momentary dipole exists at any given time.

The molecule is referred to as polar if it contains an excess of positive charge on one end and an excess of negative charge on the other. This is known as a dipole moment, which is a quantifiable propensity to rotate in an electric or magnetic field.

Polarity is the term used to describe objects that differ at either end. The term "polar" refers to molecules that contain both positive and negative ends. The term "non-polar" is used if they don't. Polar objects can be drawn to or repelled by one another (opposite charges attract, alike charges repel).

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The best fluid for hydration of the university track and field athletes who prepare for the 100 meter dash is the best fluid for hydration of the university track and field athletes who prepare for the 100 meter dash is fruit juice. sports drinks like Gatorade.

So the correct option is sports drink like Gatorade.

Who are field athletes?

Field athletes include sprinters, distance runners, hurdlers, jumpers, and throwers. The first three compete in races on the track, while the jumpers and throwers make up the field athletes.

In conclusion, some fluids for hydration are best suited for certain events.

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