use the starting and ending volumes from week 7 titrations along with the given concentrations to calculate the exact concentration of hydrochloric acid

Answer:

Option A.

Explanation:

According to the attached picture (which I'm assuming is the same that you have, but you forgot to attach) let's see wchi thermometer will help to measure the temperature of this liquid at 43.6 °C

In thermometer A, we can see that the the measures of temperatures are measured to the tenth digit. This means that the measures would be more accurate, and this is precisaly what we want in this case, because the temperature we need to measure is 43.6 °C.

Thermometer B measures to 1 digit only, therefore, is less accurate than thermometer A, and the measure would not be readable with accuracy.

Remember that accuracy is related to the closeness of a standard value, while the precision is related to the closeness of two or more measures.

In this problem we do not have several measures, just one, and we need to do it with more accuracy, so thermometer A would fullfill this.

Answer:

B) Thermometer B, because it measures temperature more accurately than thermometer A

B has more values listed so it is more accurate to measure a complicated value like 43.6

Answer:

Mercury

Explanation: Under standard conditions mercury is a shiny, heavy, silvery liquid. It is the only metal that is liquid at room temperature.

Answer:

Mercury, Venus, earth and mar, Jupiter, Saturn, urines, Neptune.

Explanation:

It is impossible to estimate how many teaspoons would be produced without understanding the density of the silver.

In an electrolytic cell, the amount of substance that is deposited on the electrode is directly proportional to the amount of charge that passes through the cell. The charge passed (Q) can be calculated by multiplying the current (I) by the time (t) for which it flows.

Q = I × t

In this case, the current is 5 amperes and the time is 2.5 hours. Converting hours to seconds, we get:

t = 2.5 hours × 3600 seconds/hour = 9000 seconds

So, the charge passed is:

Q = 5 amperes × 9000 seconds = 45,000 coulombs

The amount of silver deposited is proportional to the charge passed. The electrochemical equivalent of silver (the mass of silver deposited per unit charge passed) can be looked up in a table or calculated from the formula for the electrolysis reaction. For the reduction of Ag+ to Ag, the electrochemical equivalent is 0.001118 g/coulomb.

So, the mass of silver deposited is:

m = electrochemical equivalent × Q = 0.001118 g/coulomb × 45,000 coulombs = 50.31 g

Converting grams to teaspoons depends on the density of silver, which varies depending on the form it is in. Therefore, without knowing the density of the silver, it is not possible to determine the number of teaspoons that would be produced.

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The no. of moles of \(CH_4\) remaining after the reaction is found to be 11.5 moles.

The no. of moles of a material equals the ratio of its given mass to the mass of one mole of that molecule in a chemical reaction.

The coefficients reflect the number of moles, not simply molecules, that react.

Stoichiometric coefficients are the numbers that come before the chemical formula of a molecule participating in a reaction. They assist us in determining the relative amounts or no. of moles of each reactant consumed and product created during a reaction.

\(CH_4 (g) + 2O_2 (g) \rightarrow CO_2 (g) + 2H_2O (g)\)

No. of moles of \(CH_4\) = 13.0 mol

No. of moles of \(O_2\) = 3.0 mol

Here \(O_2\) is limiting reagent because moles of \(O_2\) is less.

Thus, \(CH_4\) is in excess

1 mol \(CH_4\) = 2 mol \(O_2\)

x mol \(CH_4\) = 3 mol \(O_2\)

Moles of \(CH_4\) used = 3 x 1 / 2 = 1.5 mol

Here we have 13 moles of \(CH_4\),

Therefore,

No. of moles of \(CH_4\) left = 13 - 1.5 = 11.5

Result:

11.5 moles of \(CH_4\) will remain after the reaction.

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Answer:

0.373 moles of ammonium carbonate

Explanation:

To solve this question we must find the molar mass of ammonium carbonate. With the molar mass and the mass we can find its moles, as follows:

(NH₄)₂CO₃ contains: 2 moles N, 8 moles H, 1 mole C, 3 moles O. Molar mass:

2N = 14.0g/mol*2 = 28.0

8H = 1.0g/mol*8 = 8.0

1C = 12.0g/mol*1 = 12.0

3O = 16.0g/mol*3 = 48.0

Molar mass: 28.0 + 8.0 + 12.0 + 48.0 = 96.0g/mol

The moles of ammonium carbonate in 35.8g are:

35.8g * (1mol / 96.0g) =

yes

Explanation:

the molar mass of a compound is g/mol

The description of the molecules shown is it is unsaturated alkynes. The correct option is A.

Alkynes are unsaturated double bond containing compound that react with hydrogen when a catalyst is present.

The pie bond shows that the hydrogen atoms are lost from the alkanes.

Thus, the correct option is A, unsaturated alkynes.

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The maximum mass of zinc sulfate crystals that could obtain is about 6 g from the zinc of 1.36 g.

The theoretical yield of the reaction can be defined as the amount of product determined from stoichiometric calculations.

The given chemical formula of the zinc sulfate crystals ZnSO₄.7H₂O. the molecular mass of the zinc sulfate crystals is 287 g/mol.

The atomic mass of the zinc = 65.3 g/mol

The 65.3 g of Zn present in zinc sulfate crystals = 287 g

Then 1.36 g of zinc was used to prepare zinc sulfate crystals = (287/65.3) × 1.36 = 6g.

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Answer:

Students A, B, and E

Explanation:

Student A is playing in the lab, student B is sniffing the flask, you're supposed to waft, and student E is eating while working.

The ratios are 1:2:1. The ratio of carbon, hydrogen, and oxygen in most carbohydrates is 1:2:1.

This means for every one carbon atom and there are two hydrogen atoms and one oxygen atom. It forms the structure of even the most complex carbohydrates such as starch and glycogen. Carbohydrates are the organic molecules madeup of carbon, hydrogen, and oxygen atoms.

The ratio of these three atoms in carbohydrates is most commonly 1:2:1, meaning for every carbon atom, there are two hydrogen atoms and a oxygen atom. This ratio is the same for both monosaccharides and polysaccharides. Monosaccharides are the simplest carbohydrates and are composed of single sugar molecules, while polysaccharides are larger molecules composed of multiple sugar molecules linked together.

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The mass is going to increase because the iron was combined with oxygen.

We know that the mass of the object can be obtained by the use of a weighing balance. Again it is very important that we should bear in mind that what has happened here as the iron is rusting is actually a chemical change.

The ion was bale to combine with oxygen in the presence of moisture, Given the fact that the iron has combined with oxygen, we no longer have a pure iron hence the mass of the iron is definitely going to become increased.

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If a piece of iron is weighed, allowed to go rusty, and weighed again, it has increased in mass, this is because of the formation of rust.

Rusting is the slow oxidation of iron in the presence of oxygen and moisture that results in the creation of hydrated iron oxide. Rust is a brown coating that formed when iron and oxygen in the air combine, when moisture is present. Rust is a reddish-orange flaky material.

The metal surface is where rusting is most prone to happen since it is an oxidation process.

When rust forms, the mass of the iron object is increased by the mass of oxygen that has combined with some of the iron.

If a piece of iron is weighed, allowed to go rusty, and weighed again, it has increased in mass, this is because of the formation of rust.

\(Fe_{2} O_3.nH_2O\) - this will be the new composition and when you find the molar mass of this compound its obviously greater than Fe (Iron).

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The reaction of silver nitrate with copper is a substitution reaction. We have copper in its free state, Cu, and we have silver nitrate which has the formula AgNO3. The copper replaces the silver obtaining the following reaction:

The products obtained are copper nitrate and silver.

The word equation will be:

Because not enough acid or base is present in the amount of water produced when additional acid or base is introduced, water is not a good buffer.

Yet, in real-world applications, water is a very poor buffer because it cannot produce more H+ than OH- because both species develop from the same reactant at a 1:1 stoichiometric ratio. Remember, a buffer needs to be able to account for even slight pH variations. Water cannot achieve this by itself. In the following ways, water functions as a temperature buffer: Water has a large capacity for heat. It may take heat from its surroundings and release cooling effects in return. Hence, during extremely hot weather conditions, water has a cooling effect.Water functions well as a solvent, dissolving a wide variety of compounds due to its polarity and capacity to create hydrogen bonds.

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Explanation:

I don't understand your language so please explain it in english

The ionization of a drug increases water solubility and decreases lipid solubility. A weak acid becomes less water-soluble and more lipid-soluble at acidic pH due to the fact that the more the ionization of the acid, the more hydrophilic it becomes and, therefore, the more it is likely to be dissolved in water.

Ionization is a chemical process in which the net electric charge of an atom or molecule changes. A substance will ionize into positive and negative ions when it comes into contact with an ionizing agent such as water. The degree of ionization is affected by the pH of the solution, which is a measure of its acidity or basicity.

Water is polar, meaning that it has a positively charged side and a negatively charged side, allowing it to dissolve polar compounds (compounds that have a charge). Since an ionized molecule will have a charge, it will be more water-soluble. On the other hand, lipid solubility is determined by the compound's polarity. Since lipids are non-polar, a non-ionized molecule is more likely to dissolve in a lipid solution.

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The names of the compounds differ by the type of metal present in them, which are Calcium (Ca) and Cadmium (Cd)

From the question,

We are to determine the how the name of CaS differ from the name of CdS

First, we will determine the identities of the elements in the given compounds

Ca represents calcium

and

S represents sulfur

∴ The compound is named Calcium sulfide

Cd represents the element Cadmium

and

S represent the element Sulfur

∴ The compound is named Cadmium sulfide

Hence, the names of the compounds differ by the type of metal present in them, which are Calcium (Ca) and Cadmium (Cd)

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The correct ranking of compounds in order of increasing keq for this equilibrium is Acetone < Propanone < Benzaldehyde.

The correct ranking of compounds in order of increasing keq for the equilibrium of each of the carbonyl compounds with HCN to produce cyanohydrins is

Acetone < Propanone < Benzaldehyde.

In the above reaction, the cyanide ion acts as a nucleophile and attacks the carbonyl carbon atom in the carbonyl compound to form an intermediate compound. Then the intermediate compound formed by the reaction between HCN and the carbonyl compound undergoes an intramolecular rearrangement to form cyanohydrin.Based on the stability of intermediate compound formed, the order of increasing stability is as follows:

Acetone < Propanone < Benzaldehyde.

Since the keq is directly proportional to the stability of the intermediate, the order of increasing keq for the equilibrium of each of the carbonyl compounds with HCN to produce cyanohydrins is

Acetone < Propanone < Benzaldehyde.

The correct ranking of compounds in order of increasing keq for this equilibrium is

Acetone < Propanone < Benzaldehyde.

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Answer:

the answer is 1

the  coefficient needed to balance this equation is 1

Explanation:

Pr{D C} = 0.94

The probability Pr{D C} represents the probability of not having the disease. In this case, the given information from Exercise 3.2.8 includes D (disease), D C (no disease), P (positive test result), and P C (negative test result). To find Pr{D C}, we need to consider the given probabilities.

The probability of having the disease, Pr{D}, is not explicitly given in the question. However, we can infer it by considering the complement of Pr{D C}. Since Pr{D C} represents the probability of not having the disease, the complement of Pr{D C} would represent the probability of having the disease.

Therefore, Pr{D} = 1 - Pr{D C}

Given that Pr{D C} = 0.06, we can calculate Pr{D} as follows:

Pr{D} = 1 - Pr{D C}

Pr{D} = 1 - 0.06

Pr{D} = 0.94

Hence, the probability of not having the disease (Pr{D C}) is 0.94.

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A nucleus maintains its stability despite being composed of positively charged particles due to the strong nuclear force that overcomes the repulsion between the protons.

The neutrons in the nucleus play a crucial role in maintaining stability. Neutrons have no charge and do not contribute to the electrostatic repulsion. Their presence helps to increase the attractive nuclear force, balancing the repulsive force between protons. This shielding effect allows the nucleus to remain stable.
Another important factor is that the Coulomb force, which describes the electrostatic repulsion between charged particles, is not applicable at the nuclear level. The range of the Coulomb force is limited, and its influence diminishes at very short distances inside the nucleus. Instead, the strong nuclear force takes over and becomes the dominant force, binding the protons and neutrons together.
Additionally, the surrounding electrons in an atom contribute to the nucleus's stability. Electrons are negatively charged and are located in the electron cloud surrounding the nucleus. Their negative charge helps neutralize the positive charge of the protons, reducing the overall electrostatic repulsion within the atom. This electron-proton attraction further contributes to the stability of the nucleus.

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Answer:

12.9L

Explanation:

V1 = 8.5L

P1 = 3.5

P2 = 2.3

V2 = ?

P1 V1 = P2 V2 ( Boyle's law )

3.5×8.5 = 2.3×V2

Divide both sides by 2.3

3.5×8.5/2.3 = 2.3×V2/2.3

V2 = 29.5/2.3

=12.9L

Option A). The salts that will be substantially more soluble in an acidic solution than in pure water are PbCl₂, Al(OH)₃, and FeS.

1. Look for salts containing anions that can react with H+ ions from acidic solutions, making them more soluble. These anions include Cl-, OH-, S₂-, and PO₄₃-.
2. From the given choices, identify the salts containing these anions:
  - PbCl₂ (contains Cl-)
  - Al(OH)₃ (contains OH-)
  - Ba₃(PO₄)₂ (contains PO₄₃-)
  - FeS (contains S₂-)
3. Consider the cations' ability to form soluble complexes with the anions. Al₃+ and Fe₂+ can form soluble complexes with OH- and S₂-, respectively, while Pb₂+ can form soluble complexes with Cl-.
4. Based on this analysis, the salts that will be more soluble in acidic solutions are:
  - PbCl₂
  - Al(OH)₃
  - FeS

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Answer:

Calcium, potassium, aluminum, chlorine, bromine

Explanation:

I do not know all of them, but here are some.

1.343 x 10²³ grams of potassium hydroxide (KOH), exist in 12.50 X 1019 molecules of KOH.

The quantity of units in one mole of any substance is called the Avogadro number, also referred to as the Avogadro constant. The comparable number is 6.0221408571023. The units may be electrons, ions, atoms, or molecules, depending on the type of reaction occurring and the substance being utilized. Two gases of the same volume have the same number of molecules when they are at the same temperature and pressure, according to Amedeo Avogadro.

Given:

0.2228 mol of potassium hydroxide in 12.50 X 1019 molecules of KOH

Hence in one mole, there is Avogadro number of molecules

i.e. 6.023 × 10²³ molecules.

no of atoms = 0.223 x 6.023

= 1.343 x 10²³

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None of the elements have the same electron arrangement as neon.

Neon (Ne) has a stable electron arrangement with a full outer shell of electrons. It belongs to the noble gas group, which means its outermost energy level (valence shell) contains a total of 8 electrons, making it chemically inert. This arrangement is known as a "closed shell" or "octet configuration." No other element in the periodic table has the exact electron arrangement as neon, as each element has a unique number of electrons and different electronic configurations.

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Answer:

because the water/air needs to be pumped out.

Explanation:

hoped this helped! (just give it a 1 star if it didn't)

Answer:

Add a picture please! or give answer choices

Explanation:

Answer:

theres no examples

Explanation:

i can answer if you add examples

Answer: 1. Two protons within the Sun fuse. Most of the time the pair breaks apart again, but sometimes one of the protons transforms into 2.a neutron via a weak nuclear force. Along with the transformation into a neutron, a positron, and neutrino are formed. This resulting proton-neutron pair that forms sometimes is known as deuterium.

3. A third proton collides with the formed deuterium. This collision results in the formation of a helium-3 nucleus and a gamma ray. These gamma rays work their way out from the core of the Sun and are released as sunlight.

4Two helium-3 nuclei collide, creating a helium-4 nucleus plus two extra protons that escape as two hydrogens. Technically, beryllium-6 nuclei form first but are unstable and thus disintegrate into the helium-4 nucleus.

Explanation:

The final helium-4 atom has less mass than the original 4 protons that came together (see E=mc2). Because of this, their combination results in an excess of energy being released in the form of heat and light that exits the Sun, given by the mass-energy equivalence. To exit the Sun, this energy must travel through many layers to the photosphere before it can emerge into space as sunlight. Since this proton-proton chain happens frequently - 9.2 x 1037 times per second - there is a significant release of energy.[3] Of all of the mass that undergoes this fusion process, only about 0.7% of it is turned into energy. Although this seems like a small amount of mass, this is equal to 4.26 million metric tonnes of matter being converted to energy per second.[3] Using the mass-energy equivalence, we find that these 4.26 million metric tonnes of matter are equal to about 3.8 x 1026 joules of energy released per second!

The equilibrium constant gives us an idea of the extent of reaction. For the reaction; 2GeCl4(g) = 2Ge(g) + 4Cl2 (g), the equilibrium constant is 1 * 10^-20.

The equilibrium constant gives us an idea of the extent of the conversion of reactants to products in a reaction.

In this case, we know that 2GeCl4(g) = 2Ge(g) + 4Cl2 (g) is the reverse of Ge (g) + 2Cl2 (g) <-> GeCl4 (g) hence we only need to invert the value of the equilibrium constant and raise it to power 2 to have 1 * 10^-20.

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