3.06: Laboratory: Titration


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1. What are the results of the titration and what are the concentrations of samples A and B? Answer in complete sentences.

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2. Describe three possible sources of error in a titration experiment?

Type your answer here.


3. What is an example of a problem that could be solved using a titration in the real world?

Type your answer here.

The value of k is approximately -0.1287. The correct answer is option a. -0.1287

To determine the value of k in the radioactive decay formula A = \(le^kt\), we can use the given information:

A = final amount = 25 grams

I = initial amount = 70 grams

t = time = 8 years

We can substitute these values into the formula and solve for k:

A = \(Ie^kt\)

25 = \(70e^k(8)\)

Dividing both sides of the equation by 70:

\(e^k(8)\)= 25/70

Taking the natural logarithm (ln) of both sides to isolate k:

ln\((e^k(8))\) = ln(25/70)

k(8) = ln(25/70)

Dividing both sides by 8:

k = (1/8) × ln(25/70)

Using a calculator to evaluate this expression, we find:

k ≈ -0.1287

Therefore, the value of k is approximately -0.1287.

The correct answer is: a. -0.1287

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Answer:

b

Explanation:

the angular distance of a place east or west of the meridian at Greenwich, England, or west of the standard meridian of a celestial object, usually expressed in degrees and minutes

Answer:

protons 30

neutrons 35

electrons 30

The molar mass is the mass of which of the following?

The mass of a substance per mole and the g/mol of a substance is correct.

The molar mass of a substance is the mass per mole of its entities (molecules, atoms, ions, etc)

6.0221x10^23 particles of a substance is also correct. The mole contains 6.022 x 1023 entities. The number of entities in a mole is called Avogadro's number.

Answer:

The mass of a substance per mole

The g/mol of a substance

6.0221 x 10^23 particles of a substance



Answer:

Liquid volume is usually measured using either a graduated cylinder or a buret. As the name implies, a graduated cylinder is a cylindrical glass or plastic tube sealed at one end, with a calibrated scale etched (or marked) on the outside wall.

When an organism's cells only have one set of chromosomes, the organism is said to be haploid. All organisms that reproduce sexually are diploid (having two sets of chromosomes, one from each parent). Only the egg and sperm cells in humans are haploid.

The term "diploid" describes an organism's cells having two full sets of chromosomes, with one chromosome from each parent present in each pair. Since humans are diploid, the majority of their cells have 23 pairs of chromosomes.

Distinguish between haploid and diploid.

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Answer:

vibrate and move

Explanation:

It is just the answer

Answer:

d

Explanation:

Hope this helps and have a great day!!!

Answer:

Column A            \({}\)                                              Column B

1. CaS                   \({}\)                                              Calcium Sulfide

2. CaSO₄            \({}\)                                                Calcium sulfate

3. CaSO₃            \({}\)                                                 Calcium sulfite

Explanation:

1) Calcium sulfide is a compound formed between calcium, Ca, and sulfur, S, with a chemical formula of CaS. It forms cubic crystals similar to rock salt, and smells like rotten eggs

2) Calcium sulfate is a chemical compound consisting of calcium, Ca, and sulfate SO₄. It is found in nature in the hydrated form as the mineral gypsum

3)Calcium sulfite is a chemical compound formed between calcium, Ca and sulfite, SO₃ used to treat water and preserve food.

Answer:

the formula for calcium sulfite is CaSO3

the formula for calcium sulfate is CaSO4

the formula for calcium sulfide is CaS

Explanation:

The sigma bond in acetylene \((C_2H_2)\) is formed by the overlap of the 1s orbitals of the two carbon atoms and the 2s orbital of the two hydrogen atoms.

To form the sigma bond, the 1s orbital of each carbon atom must overlap with the 2s orbital of the adjacent hydrogen atom. The sigma bond is the strongest type of covalent bond and has the lowest bond dissociation energy.

The approximate bond angle in acetylene is 109.5 degrees. This bond angle is determined by the geometry of the molecule and the arrangement of the atoms in space. The bond angle in acetylene is slightly distorted from a perfect tetrahedral shape due to the electron density distribution in the molecule.  

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Francium, has a half-life of 22 minutes and decays alpha decay to radon, which then decays through alpha decay to polonium

The highly radioactive metal francium eventually transforms into a stable isotope of lead through a series of nuclear decays. The half-life of francium, the least stable and rarest of the alkali metals, is only 22 minutes. Alpha particles (helium nuclei) and beta particles are released as it degrades through a series of alpha and beta decays (electrons or positrons). The decay chain then continues through a number of alpha and beta decays until it eventually reaches lead-207, which is a stable isotope of lead. It is crucial to remember that francium is extremely rare and not present in large amounts in nature. It is created artificially in nuclear research facilities and is only used for that purpose.

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Answer:

NaOH = 40 g/mole

M = 10*d*m% /MW

M = 10*1.116*15/ 40

M = 4.185

––––––––––––––––––––

pH = 11 –––> pOH = 3 –––> [OH–] = 10^–3 M

M1*V1 = M2*V2

4.185* V1 = 10^–3 * 5.3

V1 = 1.27×10^–3 L = 1.27 ml

Answer:

The answer is B

Explanation:

Answer:

Hello!

Your answer is B) Ca(HCO3)2!!

Explanation:

Hope this helps you!!

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The substance that is a weak electrolyte is (b) H₃COOH (acetic acid).

The correct answer is (b) H₃COOH (acetic acid).

A weak electrolyte is a substance that partially dissociates into ions when dissolved in water, resulting in a relatively low conductivity. Let's analyze each option:

(a) LiOH (lithium hydroxide) is a strong base and a strong electrolyte. It completely dissociates into Li⁺ and OH⁻ ions in water.

(b) H₃COOH (acetic acid) is a weak acid and a weak electrolyte. It only partially dissociates into H⁺ and CH₃COO- ions in water. Most of the acetic acid molecules remain undissociated.

(c) HNO₃ (nitric acid) is a strong acid and a strong electrolyte. It completely dissociates into H⁺ and NO₃⁻ ions in water.

(d) Na₂SO₄ (sodium sulfate) is a strong electrolyte. It completely dissociates into Na⁺ and SO4²⁻ ions in water.

Therefore, the substance that is a weak electrolyte is (b) H₃COOH (acetic acid).

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The list the addition reactions of alkenes and alkynes are as follows:

Addition Reactions of Alkenes:

1. Halogenation: Alkenes react with halogens to form halohydrins.

2. Hydration: Alkenes react with water to form alcohols in the presence of an acid catalyst.

3. Hydrohalogenation: Alkenes react with hydrogen halides to form alkyl halides.

4. Hydrogenation: Alkenes react with hydrogen in the presence of a metal catalyst to form alkanes.

5. Hydroboration-Oxidation: Alkenes react with borane to form alcohols.

Addition Reactions of Alkynes:

1. Halogenation: Alkynes react with halogens to form dihalides.

2. Hydration: Alkynes react with water to form ketones in the presence of an acid catalyst.

3. Hydrohalogenation: Alkynes react with hydrogen halides to form alkyl halides.

4. Hydrogenation: Alkynes react with hydrogen in the presence of a metal catalyst to form alkanes.

5. Hydroboration-Oxidation: Alkynes react with borane to form aldehydes.

Similarities: Both alkenes and alkynes undergo the same types of addition reactions.

Differences: The products of the addition reactions are different depending on the type of compound being reacted. For example, alkenes form alcohols when reacted with water, while alkynes form ketones.

What do you mean by Alkynes?

Alkynes are a group of hydrocarbons that contain at least one triple bond between two carbon atoms. They are also known as acetylenes and are unsaturated hydrocarbons with the general chemical formula of CnH2n-2.

What do you mean by Alkenes?

Alkenes are a class of hydrocarbons characterized by a carbon–carbon double bond. They are typically colorless, flammable, gases or liquids with a sweet odor. Alkenes are a major component of gasoline and are used in the manufacture of plastics and other industrial materials.

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Answer:

2Na + 2H2O → 2NaOH + H2

Explanation:

A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge are the same for both the reactants and the products.

Explanation:

(1) 1 m = 100 cm

1.45 m = 100 × 1.45 cm = 145 cm

(2) 1 kg = 1000 g

325 g = 0.325 kg

(3) 1 L = 1000 mL

0.0024 L= 2.4 mL

(4) 1 km = 1000 m

\(1.55\times 10^4\ m=1.55\times 10^4\times 0.001=15.5\ km\)

(5) 1 mm = 0.001 m

\(4.75\times 10^{-2}\ m=4.75\times 10^{-2}\times 1000\ mm\\\\=47.5\ mm\)

(6) 1 kg = 100000 cg

0.459 kg = 45900 cg

(7) 1 dm = 10⁻⁴ dm

5,995 dm = 5,995 × 10⁻⁴ km

(8) 1 g = 1000 mg

450 g = 450000 mg

(9) 1 dm = 100 m

0.003 dm = 0.3 mm

(10) 1 mL = 0.001 l

4.567 × 10⁴ mL = 45.67 L

Answer:

Physical change

Explanation:

Cutting and freezing are both examples of physical changes that do not alter the chemical composition or properties of the object/substance.

Answer:

physical change

Explanation:

carrot lost its original shape

Water vapor does contribute to the greenhouse effect, but it is not considered a primary greenhouse gas because it has a relatively short atmospheric lifetime compared to other gases such as carbon dioxide.

Additionally, the amount of water vapor in the atmosphere is largely controlled by temperature, meaning that as the atmosphere warms, more water vapor can evaporate and enter the atmosphere, but as it cools, water vapor can condense and return to the surface. Therefore, while anthropogenic emissions of water vapor do contribute to the overall concentration in the atmosphere, its impact on climate change is largely driven by other greenhouse gases.

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The molecular formula of the unknown compound is C2H2O2.

To determine the molecular formula of the unknown compound, we need to calculate the empirical formula first and then find the multiple of its subscripts to obtain the molecular formula.

Given:

Percentage of carbon = 40.0%

Percentage of hydrogen = 6.7%

Percentage of oxygen = 53.3%

Molecular mass = 60.0 g/mol

Step 1: Convert the percentages to grams.

Assuming we have 100 grams of the compound:

Mass of carbon = 40.0 g

Mass of hydrogen = 6.7 g

Mass of oxygen = 53.3 g

Step 2: Convert the masses to moles using the molar masses of the elements.

Molar mass of carbon = 12.01 g/mol

Molar mass of hydrogen = 1.008 g/mol

Molar mass of oxygen = 16.00 g/mol

Number of moles of carbon = Mass of carbon / Molar mass of carbon

= 40.0 g / 12.01 g/mol

= 3.332 mol

Number of moles of hydrogen = Mass of hydrogen / Molar mass of hydrogen

= 6.7 g / 1.008 g/mol

= 6.648 mol

Number of moles of oxygen = Mass of oxygen / Molar mass of oxygen

= 53.3 g / 16.00 g/mol

= 3.331 mol

Step 3: Determine the empirical formula by dividing the moles by the smallest value.

Dividing the moles of carbon, hydrogen, and oxygen by 3.331 gives approximately 1 for each element.

So, the empirical formula of the compound is CHO.

Step 4: Determine the multiple of the subscripts to obtain the molecular formula.

To find the multiple, we divide the molecular mass by the empirical formula mass.

Molecular mass = 60.0 g/mol

Empirical formula mass = (12.01 g/mol) + (1.008 g/mol) + (16.00 g/mol) = 29.018 g/mol

Multiple = Molecular mass / Empirical formula mass

= 60.0 g/mol / 29.018 g/mol

= 2.07

Rounding to the nearest whole number, we get 2.

Therefore, the molecular formula of the unknown compound is C2H2O2.

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Explanation:

the pressure and temperature of the air increase

reason:

the volume of the space containing air decreases.

Explanation:

Whether you know it or not, compressed air is involved in every aspect of our lives, from the balloons at your birthday party to the air in the tires of our cars and bicycles. It was probably even used when making the phone, tablet or computer you’re viewing this on.

The main ingredient of compressed air is - you guessed it! - air. Air is a gas mixture, which means it consists of many different gases. Primarily these are nitrogen (78%) and oxygen (21%).

The temperature of the air is directly proportional to the mean kinetic energy of these molecules. This means that the air temperature will be high if the mean kinetic energy is large (and the air molecules move faster). The temperature will be low when the kinetic energy is small.

Compressing the air makes the molecules move more rapidly, which increases the temperature. This phenomenon is called “heat of compression”. Compressing air is literally to force it into a smaller space and as a result bringing the molecules closer to each other. The energy that gets released when doing this is equal to the energy required to force the air into the smaller space. In other words, it stores the energy for future use.

The equilibrium constant (K) for the reaction HCN(aq) + NH3(aq) ⇌ CN(aq) + NH4(aq) can be calculated using the given concentrations. The value of K is determined to be 0.036.

To calculate the equilibrium constant (K), we need to use the concentrations of the species at equilibrium. In this case, the given concentrations are:

[HCN] = 0.100 M

[NH3] = 0.140 M

[CN] = 0.055 M

Using the balanced chemical equation, we can write the expression for K as:

K = ([CN][NH4]) / ([HCN][NH3])

Substituting the given concentrations:

K = (0.055)([NH4]) / (0.100)(0.140)

We need to determine the concentration of NH4 at equilibrium. Since HCN and NH3 react to form CN and NH4, we can assume that the change in concentration of NH3 is equal to the change in concentration of NH4.

Change in [NH3] = Change in [NH4]

Let's assume x is the change in concentration of NH3 and NH4 at equilibrium. Therefore:

[HCN] = 0.100 - x

[NH3] = 0.140 - x

[CN] = 0.055 + x

[NH4] = x

Now we can substitute these values into the equilibrium constant expression:

K = (0.055 + x)(x) / ((0.100 - x)(0.140 - x))

Simplifying the expression and neglecting the x term in comparison to the initial concentrations:

K = (0.055)(x) / (0.100)(0.140)

Solving for x:

K = 0.036

Therefore, the equilibrium constant (K) for the given reaction is 0.036.

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Answer:

it depends on the mass of the object but sometimes smaller objects have more density the higher the mass the the lower the density

The metal that is most easily oxidized is Aluminum.

Aluminum is one metal that easily reacts with oxidizing agents. In the reaction given, nickel is one of the oxidizing agents present. When Aluminum is exposed to oxidizing agents such as this element, water, and oxygen, it immediately gets oxidized. So, the fastest metal that can be oxidized in this experiment is Aluminum.

Also, in the diagram, we have three other elements namely, copper, nickel, and iron. The ion that is most easily reduced from the options given is copper. This is because of its positive reduction value.

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Complete Question:

The following data were measured using _ nickel electrode as the standard: Potential, volts Cu2t(aq) + 2 e" - Cu(s) 40.62 Ni2+(aq) +2e _ Ni(s) +0.00 Fe2t(aq) + 2 e ~ Fe(s) -0.15 Al3+(aq) + 3 € v Al(s) -1.38 Which metal is most easily oxidized?

Answer:

Inferring is when a scientist uses reasoning to explain or interpret the things they observe

Answer:

The compounds differ in (2) molecular formula.

Explanation

The molecular formula represents the actual number and types of atoms present in a molecule. In the given compounds, the arrangement of atoms is different, resulting in different molecular formulas.

The first compound is an organic molecule with a central oxygen atom (O) bonded to two carbon atoms (C) and two hydrogen atoms (H) on each side. Its molecular formula is C2H6O.

The second compound is an organic molecule with a chain of four carbon atoms (C) and 10 hydrogen atoms (H). Its molecular formula is C4H10.

Therefore, the compounds differ in their molecular formulas, as the arrangement and number of atoms are distinct. The other options mentioned, such as gram-formula mass, percent composition by mass, and physical properties at STP, may vary between compounds but are not the factors that differentiate these specific compounds in this context.

Answer: 47 p+, 107 n, 48 e–

Explanation:

To write the balanced complete molecular chemical equation and the balanced net ionic chemical equation, including phase labels, we need to first understand what they are .

Molecular chemical equation: A molecular equation is a chemical reaction equation where the reactants and products are expressed as molecules and the charges aren't shown. A molecular equation can show the reactants and products as solids, liquids, or gases with their states written in parenthesis after each molecule.

Net ionic chemical equation: The chemical equation in which all the spectator ions are removed is known as the net ionic chemical equation. The net ionic equation represents the actual chemical change taking place in the reaction. It demonstrates the substances and ions that actually take part in the chemical change.

Here is an example of how to write the balanced complete molecular chemical equation and the balanced net ionic chemical equation, including phase labels:

Example: Sodium chloride reacts with silver nitrate to form silver chloride and sodium nitrate.

Complete Molecular Chemical Equation:

NaCl(aq) + AgNO3(aq) → AgCl(s) + NaNO3(aq)

Balanced Net Ionic Chemical Equation:

Ag+(aq) + Cl-(aq) → AgCl(s) + Na+(aq) + NO3-(aq)

The phase labels used in the above equations are:aq: aqueous phase (dissolved in water)s: solid phase (precipitate)

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