What valume of 0.1mol /dm hydrochloric acid will be required to neutralized 20cm of 2.0mol/dm sodium hydroxide?

The percentage by mass of the active ingredient (calcium carbonate) in the antacid tablet weighing 1.36 g and containing 520 mg of calcium carbonate is approximately 38.24%

To calculate the percentage by mass of the active ingredient (calcium carbonate) in the antacid tablet, we need to determine the ratio of the mass of calcium carbonate to the total mass of the tablet and express it as a percentage.

Convert the mass of calcium carbonate from milligrams to grams:

  Mass of calcium carbonate = 520 mg = 520 mg * (1 g / 1000 mg)

  Mass of calcium carbonate = 0.520 g

Determine the percentage by mass of calcium carbonate:

  Percentage by mass = (Mass of calcium carbonate / Total mass of tablet) * 100

  Total mass of tablet = 1.36 g

  Percentage by mass = (0.520 g / 1.36 g) * 100 = 38.24%

Therefore, the antacid tablet contains approximately 38.24% of the active ingredient, calcium carbonate.

In conclusion, the percentage by mass of the active ingredient (calcium carbonate) in the antacid tablet weighing 1.36 g and containing 520 mg of calcium carbonate is approximately 38.24%.

This calculation provides an indication of the concentration or relative amount of the active ingredient present in the tablet.

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The number of bacon double cheeseburgers that can be made starting with the given ingredients is; five.

Limiting reactant(s) as the name implies are reactants whose availability is limited and hence, the the rate at which products are formed is limited subsequently.

From the question, to determine the limiting Reactant;

Hence;

On this note, the limiting Reactant is strips of bacon and hence, the number bacon double cheeseburgers that can be made starting with the given ingredients is; five.

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The final pressure in the heated can is 2.51 atm

From the question given above, the following data were obtained:

Initial temperature (T₁) = 25 °C = 25 + 273 = 298 K

Initial pressure (P₁) = 1 atm

Final temperature (T₂) = 475 °C = 475 + 273 = 748 K

The final pressure can be obtained as illustrated below:

\( \frac{P_1}{T_1} = \frac{P_2}{T_2} \\ \\ \frac{1}{298} = \frac{P_2}{748} \\ \\ cross \: multiply \\ \\ 298 \times P_2 = 1 \times 748 \\ \\ divide \: both \: side \: by \: 298 \\ \\ P_2 = \frac{748}{298} \\ \\ P_2 = 2.51 \: atm\)

Therefore, the final pressure in the heated can is 2.51 atm

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Answer:

2 moles H

2

Explanation:

Your tool of choice here will be the mole ratio that exists between zinc metal,  

Zn

, and hydrochloric acid,  

:HCl

, in the balanced chemical equation.

Zn

(s]

+

2

HCl

(aq]

→

ZnCl

2(aq]

+

H

2(g]

↑

⏐

You're dealing with a single replacement reaction in which zinc displaces the hydrogen from hydrochloric acid. The products of the reaction are aqueous zinc chloride and hydrogen gas.

Now, as you can see from the balance chemical equation, a  

1

:

2

mole ratio exists between the two reactants.

This tells you that in order for the reaction to take place, you need to have twice as many moles of hydrochloric acid as you do of zinc metal.

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At the same time, you have a  

2

:

1

mole ratio between hydrochloric acid and hydrogen gas.

This means that the reaction will always produce half as many moles of hydrogen gas as you have moles of hydrochloric acid.

Since you know that  

4

moles of hydrochloric acid are taking part in the reaction, and assuming that you have enough zinc metal so that it doesn't act as a limiting reagent, you can say that the reaction will produce

4

moles HCl

⋅

1 mole H

2

2

moles HCl

=

2 moles H

2

Explanation:

"If the height from which an object is dropped is increased, then the time it takes to reach the ground will also increase, because the gravitational force acting upon the object will have more time to accelerate it towards the ground."

What is Hypothesis?

A hypothesis is a proposed explanation or prediction for an observable phenomenon or problem, based on existing knowledge or research. It is an informed and testable statement that can be used to guide scientific investigations or experiments.

This hypothesis suggests that there is a relationship between the height of the drop and the time it takes for the object to hit the ground. It can be tested by dropping objects of different weights from varying heights and measuring the time it takes for them to reach the ground. The results of the experiment can then be analyzed to determine if the hypothesis is supported or not.

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Answer:

it is then exhaled

Explanation:

Carbon dioxide passes from the blood into the alveoli and is then exhaled.

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.

The force of gravity acting on the box is 1,500 N or 152.7 kg.

Force of gravity is the force that attracts two objects towards each other. The force of gravity acting on an object is directly proportional to its mass and inversely proportional to the square of the distance between the object and the center of the Earth.

The force of gravity can be calculated using the formula

Fg = mg,

where Fg is the force of gravity, m is the mass of the object, and g is the acceleration due to gravity,

which is approximately 9.81 m/s2 near the surface of the Earth.

If the box weighs 1,500 N, then the force of gravity acting on the box would be

Fg = mg

    = (1,500 N)/(9.81 m/s2)

    = 152.7 kg.

Therefore, the force of gravity acting on the box is 1,500 N or 152.7 kg.

The force of gravity is an important concept in physics, as it affects everything on Earth. The gravitational force between two objects depends on their masses and the distance between them. The more massive the objects are, the greater the force of gravity between them. Similarly, the closer two objects are, the greater the force of gravity between them.

The force of gravity is also responsible for keeping the planets in orbit around the Sun and the Moon in orbit around the Earth. It is a fundamental force of nature that plays a crucial role in our understanding of the universe.

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The answer is \(\underline{12.954}\end{aligned}$$\)

\(\begin{aligned}&\mathrm{pH}=\underline{1.046} \\&{\left[\mathrm{OH}^{-}\right]=\underline{1.11 \times 10^{-13} \mathrm{M}}} \\&\mathrm{pOH}=\underline{12.954}\end{aligned}\)

Given:

\(\left[\mathrm{H}^{+}\right]=0.090 \mathrm{M}=9 \times 10^{-2} \mathrm{M} ; \mathrm{T}\\=25^{\circ} \mathrm{C}$$\mathrm{As}, \mathrm{pH}=-\log \left[\mathrm{H}^{+}\right]$\Rightarrow \mathbf{p H}=-\log \left(9 \times 10^{-2}\right)=\underline{1.046}$$\)

The equation for the self-ionization constant of water is

\($$\mathrm{Kw}=\left[\mathrm{H}^{+}\right]\left[\mathrm{OH}^{-}\right]$$and, $\mathrm{pKw}=\mathrm{pH}+\mathrm{pOH}$\)

Since at room temperature,

\($25^{\circ} \mathrm{C}: \mathrm{Kw}=1.0 \times 10^{-14}, \mathrm{pKw}=14$\)

\(\therefore \mathrm{Kw}=\left[\mathrm{H}^{+}\right]\left[\mathrm{OH}^{-}\right]=1.0 \times 10^{-14}$$\\\Rightarrow\left[\mathrm{OH}^{-}\right]=\left(1.0 \times 10^{-14}\right) \div\left[\mathrm{H}^{+}\right]\\=\left(1.0 \times 10^{-14}\right) \div\left[9 \times 10^{-2}\right]\\=0.111 \times 10^{-12}=1.11$$\times 10^{-13} \mathrm{M}$\)

And

\($$\begin{aligned}&\mathrm{pH}+\mathrm{pOH}=\mathrm{pKw}=14 \\&\Rightarrow \mathrm{pOH}=14-\mathrm{pH}=14-1.046=\underline{12.954}\end{aligned}$$\)

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Answer:

191.11 grams of oxygen gas should be produced.

Explanation:

The balanced reaction is:

2 Al₂O₃ → 4 Al + 3 O₂

By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

Being the molar mass of each compound:

By reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

Then you can apply the following rule of three: if by stoichiometry 108 grams of aluminum are produced along with 96 grams of oxygen, 215 grams of aluminum are produced along with how much mass of oxygen?

\(mass of oxygen=\frac{215 grams of aluminum*96 grams of oxygen}{108grams of aluminum}\)

mass of oxygen= 191.11 grams

191.11 grams of oxygen gas should be produced.

The time it takes for the ejected electrons to travel 2.75 cm to the detection device is approximately 2.165 ns.

To determine the time it takes for the ejected electrons to travel a distance of 2.75 cm to the detection device, we need to calculate their speed first. We can use the energy of the incident photons and the work function of the material to find the kinetic energy of the ejected electrons, and then apply the classical kinetic energy equation. Assuming the electrons have negligible initial velocity:

1. Calculate the energy of the incident photons:

Energy = hc / λ

where:

h is Planck's constant (6.626 x 10⁻³⁴ J·s),

c is the speed of light (3 x 10⁸ m/s),

λ is the wavelength of the photons (487 nm).

Converting wavelength to meters:

λ = 487 nm = 487 x 10⁻⁹ m

Substituting the values into the equation and converting to electron volts (eV):

Energy = (6.626 x 10⁻³⁴ J·s × 3 x 10⁸ m/s) / (487 x 10⁻⁹  m) = 4.065 eV

2. Calculate the kinetic energy of the ejected electrons:

Kinetic Energy = Energy - Work Function

where the work function is given as 2.43 eV.

Kinetic Energy = 4.065 eV - 2.43 eV = 1.635 eV

3. Convert the kinetic energy to joules:

1 eV = 1.6 x 10⁻¹⁹  J

Kinetic Energy = 1.635 eV × (1.6 x 10⁻¹⁹ J/eV) = 2.616 x 10⁻¹⁹ J

4. Apply the classical kinetic energy equation:

Kinetic Energy = (1/2) × m × v²

where m is the mass of the electron and v is its velocity.

Rearranging the equation to solve for velocity:

v = √(2 × Kinetic Energy / m)

The mass of an electron, m = 9.11 x 10⁻³¹ kg.

Substituting the values and calculating the velocity:

v = √(2 × 2.616 x 10⁻¹⁹ J / 9.11 x 10⁻³¹ kg) ≈ 1.268 x 10⁷ m/s

5. Calculate the time to travel 2.75 cm:

Distance = 2.75 cm = 2.75 x 10⁻² m

Time = Distance / Velocity = (2.75 x 10⁻² m) / (1.268 x 10⁷ m/s) ≈ 2.165 x 10⁻⁹ seconds

Converting to nanoseconds:

Time ≈ 2.165 ns

Therefore, it will take approximately 2.165 nanoseconds for the ejected electrons to travel 2.75 cm to the detection device.

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Answer:To determine the number of valence electrons in an atom of a representative element, you can look at its position on the periodic table. Representative elements are also known as the main group elements and are located in groups 1-2 and 13-18 of the periodic table.

The number of valence electrons in an atom of a representative element is equal to the group number. For example, the elements in group 1 (also known as the alkali metals) have 1 valence electron, while the elements in group 2 (the alkaline earth metals) have 2 valence electrons. The elements in group 13 (the boron group) have 3 valence electrons, and so on, up to group 18 (the noble gases), which have a full set of 8 valence electrons (except for helium, which has only 2).

For example, let's consider the element sodium (Na), which is in group 1. Sodium has 1 valence electron because it is in group 1. Similarly, the element carbon (C), which is in group 14, has 4 valence electrons because it is in group 14.

Knowing the number of valence electrons in an atom is important because it helps to determine the chemical properties and reactivity of the element. Atoms with the same number of valence electrons tend to have similar chemical properties and can form similar types of chemical bonds.

Explanation:

Answer:

There are 14.2 moles of carbon in 170.3 grams of carbon

Explanation:

The mass of one mole of carbon is known as the molar mass of carbon. the unit of molar mass is grams/mole, g/mol.

The molar mass of carbon is 12 grams. This means that for every 12 grams of carbon, one has one mole of carbon.

To determine the number of moles of carbon present in 170.3 grams of carbon, the given mass of carbon, that is 170.3 grams is divided by 12.

The formula to use is: number of moles = mass of substance/molar mass of substance

Number of moles of carbon = 170.3 g / 12 g/mol = 14.2 moles

Therefore, there are 14.2 moles of carbon in 170.3 grams of carbon

The proper order is Na > Mg > Si > P > Ar. As a result of the valence electrons' low nucleostatic attraction, sodium (Na) has the biggest atomic radius.

The electrons' orbitals get bigger and bigger as we go from top to bottom, increasing the atomic size.S and Ar are hence real. S is the largest element on the periodic table since it is on the left. Na has the most atoms of any of the other elements mentioned. Due to its position to the right of silicon, phosphorus will have a lower atomic radius for an uncharged atom than silicon. Due to its position to the right of silicon, phosphorus will have a lower atomic radius for an uncharged atom than silicon. The atomic radius grows in a group from top to bottom and decreases across a period, as seen in the figures below. The smallest element is therefore helium, whereas the largest is francium.

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The component of a triglyceride within the bracket is "fatty acids."

Triglycerides are a type of lipid molecule composed of three fatty acid molecules esterified into a glycerol molecule. Fatty acids are organic compounds consisting of a long hydrocarbon chain and a carboxyl group (-COOH) at one end.

The fatty acid component plays a crucial role in the structure and function of triglycerides. The hydrocarbon chains of fatty acids can vary in length and degree of saturation. They can be short-chain, medium-chain, or long-chain fatty acids, and they can be saturated (containing only single bonds) or unsaturated (containing one or more double bonds).

When triglycerides are formed, the carboxyl group of each fatty acid reacts with a hydroxyl group of the glycerol molecule through an ester linkage. This esterification process results in the formation of three fatty acid chains attached to the three hydroxyl groups of the glycerol molecule.

Fatty acids serve as a concentrated source of energy in the body, and triglycerides function as the primary storage form of fat in adipose tissue. They also have important roles in insulation, cushioning, and as structural components of cell membranes.

In summary, the correct answer is a) fatty acids.

The complete question is:

Identify the component of a triglyceride within the bracket __________.

a. fatty acids

b. amino acids

c. nucleotides

d. glycerol

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The result of the replacement reaction  \(2Fe +3 CUSO_{4}\) is \(2Fe(SO_{4} )_{3} + 3 Cu.\)

\(2Fe +3 CUSO_{4} ----------- > 2Fe(SO_{4} )_{3} + 3 Cu.\)

the above reaction is a Displacement reaction.

When an atom or group of atoms in a molecule is replaced by another atom, this is referred to as a displacement reaction. For instance, copper metal is displaced when iron is added to a solution of copper sulfate.

When one element replaces another in a compound, it causes a single displacement reaction. Neither metal nor a nonmetal may be used as a substitute for another metal. Only a more reactive component of the chemical it reacts with can take the place of the other component.

A new insoluble ionic compound is created by a precipitation reaction between two aqueous ionic compounds. The reaction between lead (II) nitrate and potassium iodide to produce (soluble) potassium nitrate and (insoluble) lead iodide is illustrated below.

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Answer:

A) The objects always attract each other.

Explanation:

Hope it helps!

Dmitri Mendeleev observed that when the elements were arranged in order of increasing atomic mass, their properties repeated every eighth element.

Mendeleev proposed his periodic table based on this discovery.The periodic table is arranged in rows and columns. The periodic table is divided into periods (horizontal rows) and groups (vertical columns). The elements in the same group have the same number of valence electrons, which means they share similar properties.

The atomic number, element symbol, element name, atomic mass, and electron configuration of each element are all displayed in the periodic table.The periodic table is a representation of the chemical elements in order of their increasing atomic number. It also shows how the electrons of the atoms are arranged in their respective energy levels.

The periodic table is an essential tool for chemists and other scientists to understand the chemical and physical properties of the elements.

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Crystals impurities are expected to have high solubility in cold solvents. Hence, option C is correct.

Cold solvent cleaning is a process used to remove grease, wax and other impurities from metal and other parts.

The process is also called degreasing. Cold solvents are sprayed onto the dirty part and it is brushed clean.

Once the filtration process is done the collected crystals should be washed with a little more ice-cold solvent to remove final soluble impurities which would otherwise be left on the surface of the crystals.

Hence, option C is correct.

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The probability that a person has tuberculosis given a negative DNA indication is approximately 0.0005 or 0.05%.

To find the probability that a person has tuberculosis given a negative DNA indication, we can use Bayes' theorem. Bayes' theorem states that the probability of an event A given event B can be calculated using the formula: P(A|B) = (P(B|A) * P(A)) / P(B)

In this case, we want to find P(T|N), the probability of having tuberculosis given a negative DNA indication.

We are given the following information:

P(T) = Probability of having tuberculosis = 0.01 (given)

P(N) = Probability of a negative DNA indication (to be calculated)

To calculate P(N), we can use the complement rule:

P(N) = 1 - P(T) = 1 - 0.01 = 0.99

Now, we can plug the values into Bayes' theorem:

P(T|N) = (P(N|T) * P(T)) / P(N)

P(T|N) = (0.05 * 0.01) / 0.99

P(T|N) ≈ 0.0005

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One example of a naturally-occurring hydrophilic amino acid is serine. Serine has a hydroxyl (-OH) group on its side chain, which makes it attracted to water molecules and therefore hydrophilic.

This small side chain does not contain any charged functional groups and is therefore nonpolar. Because of this, Glycine does not have strong interactions with water molecules, making it hydrophilic. This means that it is attracted to water and is soluble in it. Additionally, Glycine has two hydrogen bonding sites (the carboxyl and amino groups), so it can form hydrogen bonds with other molecules. This helps it to remain soluble in water, making it a hydrophilic amino acid.

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To solve this problem, let's use the definition for molarity:

Replacing the values of the problem:

Now, to find the mass, we multiply by the molecular weight of NaCl. (Which is about 58.44g/mol)

The answer is approximately 22.2g of NaCl

Answer:

The formula mass of Na2S04 is 142.04 g/mol

Answer:

142.04 g/mol

Explanation:

the formula Na2SO4 means:two moles sodium (45.98g), one mile sulfur (32.06g), and four moles oxygen (64.00g) combine to form one mole of sodium surface (142.04g).

Answer:

Chemical sedimentary

Explanation:

Chemical sedimentary rocks form by precipitation of minerals from water.

Answer:

These are called cis-but-2-ene (where the groups are on the same side) or trans-but-2-ene (where they are on opposite sides). Cis-but-2-ene is also known as (Z)-but-2-ene; trans-but-2-ene is also known as (E)-but-2-ene. For an explanation of the two ways of naming these two compounds, follow the link in the box below.

Explanation:

Answer:

The balanced equation for the combustion of propane is:

C3H8 + 5O2 --> 3CO2 + 4H2O

So for every propane molecule, we need 5 oxygen molecules.

To calculate the number of oxygen molecules required to burn 2.56 x 10^22 propane molecules, we need to multiply the number of propane molecules by the ratio of oxygen molecules to propane molecules.

Ratio of O2 to C3H8 = 5:1

Number of O2 molecules required = (5/1) x 2.56 x 10^22 = 1.28 x 10^23

Now we can convert the number of oxygen molecules to grams using the molar mass of oxygen.

1 mole of O2 = 32 g

1.28 x 10^23 molecules of O2 = (1.28 x 10^23 / 6.022 x 10^23) moles of O2

Mass of O2 = (1.28 x 10^23 / 6.022 x 10^23) x 32 g

Mass of O2 = 6.82 grams

So, 6.82 grams of O2 are required to burn 2.56 x 10^22 propane molecules.

Answer: 8/9

Explanation: took the quiz gang

Answer:

Earth

Strongest

Moon

Gravitational

Tide

Pulls

Bulge

Waves

Proximity

Low Tide