A quantity of Lithium reacts with sulfuric acid (H2SO4) to produce .10 g of hydrogen. How many grams of lithium are required ?

Explanation:

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Answer:

l and t

Explanation:

because they are in group one

Answer:

L & T

since are found in the same group.

If a person has the values for an object's density and volume, they can calculate the object's mass. Hence option B) is correct.

If a person has the values for an object's density and volume, they can calculate the object's mass. Density is defined as the mass per unit volume of an object. Mathematically, density is calculated by dividing the mass of an object by its volume. Rearranging the equation, we find that mass is equal to the product of density and volume. Therefore, if the density and volume of an object are known, multiplying them together will yield the object's mass. The other options mentioned in the question are not directly calculated using density and volume. The object's size is a broader term that encompasses various dimensions and may not be specifically derived from density and volume alone. The shape the object forms in a container and the amount of space the object takes up are influenced by both the object's mass and its dimensions, which are not solely determined by density and volume. Therefore option B) is correct.

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The atomic ratio of carbon to oxygen in carbon monoxide (CO) is 1:1, and the atomic ratio of carbon to oxygen in carbon dioxide (CO₂) is 2:1.

Firstly, we can analyze the decomposition of carbon monoxide (CO) and carbon dioxide (CO₂) to determine the atomic ratios involved.

Let's denote the atomic ratio of carbon to oxygen in carbon monoxide as x, and the atomic ratio of carbon to oxygen in carbon dioxide as y.

According to the given data;

Decomposition of carbon monoxide (CO);

Oxygen produced = 3.36 g

Carbon produced = 2.52 g

We know that the atomic mass of carbon is 12 g/mol, and the atomic mass of oxygen is 16 g/mol. Using these values, we can calculate the number of moles for each element;

Number of moles of oxygen = mass / atomic mass = 3.36 g / 16 g/mol = 0.21 mol

Number of moles of carbon = mass / atomic mass = 2.52 g / 12 g/mol = 0.21 mol

Since the atomic ratio of carbon to oxygen in carbon monoxide is x, we can write the following equation;

0.21 mol C / (0.21 mol O) = x

Simplifying the equation, we have;

x = 1

Therefore, the atomic ratio of carbon to oxygen in carbon monoxide is 1:1.

Decomposition of carbon dioxide (CO₂);

Oxygen produced = 9.92 g

Carbon produced = 3.72 g

Following the same calculations as before;

Number of moles of oxygen = mass / atomic mass = 9.92 g / 16 g/mol = 0.62 mol

Number of moles of carbon = mass / atomic mass = 3.72 g / 12 g/mol = 0.31 mol

Since the atomic ratio of carbon to oxygen in carbon dioxide is y, we can write the following equation;

0.31 mol C / (0.62 mol O) = y

Simplifying the equation, we have;

y = 0.5

Therefore, the atomic ratio of carbon to oxygen in carbon dioxide is 1:0.5, which can be simplified to 2:1.

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--The given question is incomplete, the complete question is

"Missed this? watch kcv: atomic theory; read section 2.3. you can click on the review link to access the section in your text. carbon and oxygen form both carbon monoxide and carbon dioxide. when samples of these are decomposed, the carbon monoxide produces 3.36 g of oxygen and 2.52 g of carbon, while the carbon dioxide produces 9.92 g of oxygen and 3.72 g of carbon. Calculate the atomic ratio of carbon to oxygen in carbon monoxide, and carbon dioxide."--

Carbon dioxide absorbs heat from the sun and traps it in the Earth's atmosphere. Since the heat cannot escape, it causes the Earth's temperature to increase. answer C is correct

Carbon dioxide absorbs heat from the sun and traps it in the Earth's atmosphere. Since the heat cannot escape, it causes the Earth's temperature to increase.

The connection between increasing carbon dioxide (CO2) and increasing temperature is based on the greenhouse effect, which is a fundamental principle of Earth's climate system. The greenhouse effect refers to the process by which certain gases in the atmosphere, including carbon dioxide, absorb and trap heat radiated from the Earth's surface.

When fossil fuels are burned, such as coal, oil, and natural gas, they release carbon dioxide into the atmosphere. Additionally, deforestation and other land-use changes also contribute to the increase in atmospheric CO2 levels. These activities have significantly enhanced the natural greenhouse effect.

Carbon dioxide molecules have the ability to absorb and re-emit infrared radiation. When sunlight reaches the Earth's surface, it warms the surface, which in turn emits heat energy in the form of infrared radiation. However, certain gases in the atmosphere, like carbon dioxide, act as a barrier to this outgoing heat radiation. They absorb a portion of the infrared radiation and re-emit it in all directions, including back towards the Earth's surface. This process traps heat in the atmosphere, similar to how a greenhouse traps heat, hence the term "greenhouse effect."

As the concentration of carbon dioxide and other greenhouse gases increases in the atmosphere, more heat is trapped, leading to an overall warming of the Earth's surface and lower atmosphere. This phenomenon is commonly referred to as global warming. The increased energy in the Earth's climate system disrupts weather patterns, alters ecosystems, and poses various risks to human societies.

Scientific studies and observations have established a strong correlation between the rise in atmospheric CO2 concentrations and increasing global temperatures over the past century. The Intergovernmental Panel on Climate Change (IPCC) and numerous scientific institutions worldwide have concluded that human activities, particularly the burning of fossil fuels, are the primary cause of the observed increase in atmospheric CO2 levels and the resulting global warming trend.

In summary, the connection between increasing carbon dioxide and increasing temperature lies in the greenhouse effect, where carbon dioxide absorbs and re-emits heat radiation, trapping it in the Earth's atmosphere and causing the Earth's temperature to rise.

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The number of moles of aluminum powder needed to produce 203.7 grams of manganese is 5 moles.

Heat, Mn, and Al2O3 are produced when aluminum powder and manganese dioxide are heated.

\(3MnO_{2} + 4Al - > 3Mn + 2Al_{2} O_{3} + Heat\)

The balanced chemical equation in this situation indicates that there are 3 moles of manganese and 4 moles of aluminum involved in the reaction, which results in a 3:4 mole ratio.

You may make use of this mole ratio by calculating how many moles of aluminum are required to react with the 203.7g of Manganese. So,

Firstly, the mass of Aluminium has to be taken out

Let the mass be considered x.

So, the number of moles of Aluminium = x/27

Number of moles of Manganese = 203.7/54

Hence, the mass x will be,

\(x = 4 *203.7 * 27 / 3 * 54\)

\(x = 135.8g\)

Hence,  the number of moles of Aluminium is = 135.8/27 = 5 moles.

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Answer:

103

Explanation:

The most accurate temperature measurement for the boiling point of water is 97°C (option D).

Accuracy is the exact conformity to truth, or to a rule or model. In this sense, it is the degree of conformity of a measure to a true or standard value.

It can also be described as the proximity of a measured value to a standard or true value.

According to this question, during an experiment, students recorded the temperature observations. If the true value for the boiling point of water is 100°C, the most accurate value is 97°C.

Therefore, option D is correct.

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The new pressure will be 1.45atm.

Ideal gas equation gave a relation between pressure, temperature and volume. It can be expressed as:

PV=nRT

Where, P is pressure, V is volume and T is temperature

The given data:

\(T_{1}\) = 280K

\(T_{2}\)= 406K

\(P_{1}\) = 1 atm

\(P_{2}\) = ?

The amount of unknown pressure can be determined by using the formula:

P1/T1=P2/T2....(i)

Now, put the values of given data in above equation.

P2= P1T2/T1

P2=1×406K / 280

P2 = 1.45atm

Therefore, the new pressure will be 1.45atm

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The two ways in which the physical state of matter can be changed are melting and freezing.

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They are classified on the basis of their physical features- Shape and Appearance.

The four basic shapes of bacteria are Coccus (spherical or ovoid), bacillus (rod-like), vibrio (comma-shaped ), and spirilla (spiral or helical shaped).

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Compound, according to our last session.

Answer:

c

Explanation:

the conponents are in the line going down and the OH on the right down

Answer:

98.4 kPa

Explanation:

Step 1: Given and required data

Step 2: Calculate the total pressure of the gaseous mixture

The total pressure of the gaseous mixture (P) os equal to the sum of the partial pressures of the gases that form it.

P = pH₂O + pN₂ + pHe

P = 19.9 kPa + 53.0 kPa + 25.5 kPa = 98.4 kPa

The total pressure of the wet gas mixture is 98.4 KPa

This law states that at constant temperature, the total pressure of a mixture of gases is equal to the sum of the partial pressure exerted by each gas. Mathematically, it is expressed as

Total pressure = partial pressure of A + partial pressure of B

P = pH₂O + pN₂ + pHe

P = 19.9 + 53 + 25.5

P = 98.4 KPa

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Answer:

B. three atoms of oxygen

Molecular structure of 1-pentyne has triple bond between carbon atoms 2 and 3, and the other carbon atoms and hydrogen atoms arranged in a linear chain.

To draw the molecular structure of 1-pentyne, follow these steps:

Draw a straight chain of five carbon atoms in a row, and label them 1 through 5 from left to right.

Place a triple bond (≡) between the second and third carbon atoms, which means that there are two more bonds that need to be added to each of these atoms.

Add a single bond to each of the other carbon atoms to fulfill their bonding requirements. This means that each carbon atom should have a total of four bonds.

Add hydrogen atoms to each carbon atom to complete their bonding requirements. Carbon atoms 1, 4 and 5 should each have three hydrogen atoms attached, while carbon atoms 2 and 3 should each have one hydrogen atom attached.

The resulting structure should look like this:

H    H    H    H    H

 |    |    |    |    |

H--C--C≡C -- C--C --H

| |

H H

This represents the molecular structure of 1-pentyne, with the triple bond between carbon atoms 2 and 3, and the other carbon atoms and hydrogen atoms arranged in a linear chain.

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If a building has become accidentally contaminated with radioactivity and initially contained 4.7 kg of strontium-90 and the safe level is less than 10.2 counts/min, then the building will be unsafe for 7.2 x 10^12 seconds.

Radioactivity is the spontaneous emission of radiation from the nucleus of an unstable atom that is accompanied by a decrease in mass and a decrease in charge. There are three types of radioactive emissions : alpha particles, beta particles, and gamma rays.

Steps to solve the given problem :

We can use the following formula to calculate the radioactivity of an element :

Radioactivity = λN

where, λ = decay constant ; N = the number of atoms in the sample

Now we can use the following formula to find the decay constant :

λ = ln2 / t1/2 where, t1/2 = half-life of the substance

To calculate the half-life of strontium-90, we can use the following formula : t1/2 = 0.693 / λ

We know that the atomic mass of strontium is 89.9077 u. Thus, the number of moles of strontium-90 in 4.7 kg of the sample is :

Number of moles = Mass / Molar mass= 4.7 / 89.9077= 0.052252 mol

Now, we can use Avogadro's number to find the number of atoms in the sample :

Number of atoms = Number of moles x Avogadro's number = 0.052252 x 6.022 x 10^23 = 3.1458 x 10^22 atoms

We can use the following formula to find the radioactivity :

Radioactivity = λN= λ (3.1458 x 10^22)

We know that the safe level of radioactivity is less than 10.2 counts/min. Thus, we can set up the following equation and solve for the decay constant :

10.2 = λ (3.1458 x 10^22)λ = 3.24 x 10^-23

We can use this decay constant to find the half-life : t1/2 = 0.693 / λ = 2.14 x 10^13 s

Now we can use the half-life to find the time it takes for the sample to decay to the safe level :

ln (N0 / N) = λtN / N0 = e^(-λt)t = [ln (N0 / N)] / λ

where, N0 = initial number of atoms ; N = final number of atoms

N0 / N = 10.2 / 3.1458 x 10^22= 3.235 x 10^-21

t = [ln (1 / 3.235 x 10^-21)] / (3.24 x 10^-23) = 7.2 x 10^12 s

Therefore, the building will be unsafe for 7.2 x 10^12 seconds.

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The prophets of the period the Restoration old testament survey are Hagai, Zechariah, and Malachi.

The restoration period in the Old Testament is a period of time when the Israelites returned to their homeland after being exiled by the Babylonians.

It was a time when they re-established their faith, their community, and their relationship with God.

The period began in 538 BC when Cyrus the Great of Persia issued an edict allowing the Jews to return to their homeland and rebuild their temple.

The prophets of the period the restoration old testament survey

The three prophets of the Restoration period are Hagai, Zechariah, and Malachi.

Hagai was a prophet who encouraged the people to rebuild the temple in Jerusalem.

Zechariah was a prophet who gave hope to the people by predicting the coming of the Messiah.

Malachi was a prophet who spoke against the corruption of the priests and called the people to repentance.

These prophets played an essential role in the Restoration period, encouraging the people to return to God and rebuild their community.

They were instrumental in keeping the people focused on their faith and in reminding them of God's promises.

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Answer:

Electrolytes, particularly sodium, help the body maintain normal fluid levels in the fluid compartments because the amount of fluid a compartment contains depends on the amount (concentration) of electrolytes in it. If the electrolyte concentration is high, fluid moves into that compartment (a process called osmosis).

Explanation:

Answer:

Electrolytes are minerals in your body that have an electric charge. They are in your blood, urine, tissues, and other body fluids. Electrolytes are important because they help

Balance the amount of water in your body

Balance your body's acid/base (pH) level

Move nutrients into your cells

Move wastes out of your cells

Make sure that your nerves, muscles, the heart, and the brain work the way they should

Sodium, calcium, potassium, chloride, phosphate, and magnesium are all electrolytes. You get them from the foods you eat and the fluids you drink.

The levels of electrolytes in your body can become too low or too high. This can happen when the amount of water in your body changes. The amount of water that you take in should equal the amount you lose. If something upsets this balance, you may have too little water (dehydration) or too much water (overhydration). Some medicines, vomiting, diarrhea, sweating, and liver or kidney problems can all upset your water balance.

Treatment helps you to manage the imbalance. It also involves identifying and treating what caused the imbalance.

Answer:

atom

Explanation:

A compound is atoms combined (or something combined) and a speck of dust is visible unlike the other two

Answer:

Atom

Explanation:

It would be the atom

To estimate the deltaH for the reaction we can do it from the bond energies, that is, starting from the energy needed to form or break a bond.

The reaction energy will be equal to the binding energy of the reactants minus the binding energy of the products. To calculate each bond energy we must first identify which bonds are involved in the reaction. They give us a balanced reaction:

For the reaction, we have the following bonds

Now we are going to calculate the energy taking into account the values that we can find in tables of the bond energy.

Bond Ee (kJ/mol)

H - H 436

O=O 499

O - H 460

Therefore the energy on each side of the reaction will be:

The reaction energy will be:

We have an exothermic reaction since the result is negative. This means that the energy of the products is greater than that of the reactants.

Now we will convert the energy units to kcal:

ΔH (kcal/mol) estimated of the reaction will be -112kcal/mol

Answer:

0.054 moles

Explanation:

It is the rounded off answer.

Consider a small drop of oil of radius r that rests on the surface of liquid. Surface tension of the liquid is s0.

Surface tension of the oil liquid and oil-air interfaces are s1 and s2, respectively. Let's calculate the thickness of the drop as a function of r, s0, s1, and s2:

Surface energy is also known as surface tension. It is defined as the work done per unit area when increasing the surface area of a liquid. It has the dimensions of force per unit length. The energy required to raise a small unit area of a liquid surface by unit length is referred to as surface energy or surface tension. A spherical drop of radius r has the surface area 4πr² and surface energy of 4πr² s0.

On the oil side, the surface energy is (4/3)πr³ (s1-s0)/r = (4/3)πr² (s1-s0), whereas on the air side, the surface energy is 4πr² s2.  (Note that s1-s0 is the surface tension of the oil-air interface per unit area.)

By equating the energies of the oil-air interface and the oil-liquid interface, we can get the radius of the drop:

4πr² s0 = (4/3)πr² (s1-s0) + 4πr² s2.

Simplifying this expression we get, r = 3s0(s1 + s2)/(4(s1 - s0)s2).

The thickness of the drop t is the difference between the radii of the two surfaces (i.e., the difference between the radius of the drop and the radius of the sphere having the same volume):t = (4/3)π(r³ - r0³) / 4πr².t = (r³ - r0³)/3r²where r0 is the radius of the sphere having the same volume as the drop.

The volume of the drop is (4/3)πr³, and the volume of the sphere having the same volume as the drop is (4/3)πr0³. Thus,r³ = (s1 + s2)³ / (27s0²s2), and r0³ = (s1 + s2)³ / (27s0²s1).

Therefore, t = (r³ - r0³) / 3r² = (s1 - s0)(s2 - s0)r / (3s0s1s2).

Therefore, the thickness of the drop is t = (s1 - s0)(s2 - s0)r / (3s0s1s2).

Hence, the thickness of the drop can be calculated as a function of r, s0, s1, and s2.

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An aqueous solution of an arrhenius acid reacts with an aqueous solution of an arrhenius base to produce water and salt.

This is a compound which is formed as a result of a neutralization reaction between acid and base.

Arrhenius acid reacts with an aqueous solution of an arrhenius base to produce water and salt due to increased concentration of H+ and OH- respectively.

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The order of strength of hydrogen bonds, dispersion forces, and dipole-dipole forces is as follows: Hydrogen bonding , Dipole-dipole interactions ,London dispersion forces.

Hydrogen bonding: Hydrogen bonding is the strongest type of intermolecular force. It occurs when a hydrogen atom is covalently bonded to a highly electronegative atom (such as nitrogen, oxygen, or fluorine) and is attracted to another highly electronegative atom in a nearby molecule. An example of a molecule that exhibits hydrogen bonding is water (H2O). Dipole-dipole interactions: Dipole-dipole interactions are slightly weaker than hydrogen bonding, but still stronger than London dispersion forces. They occur between molecules that have permanent dipoles, or regions of partial positive and negative charge. An example of a molecule that exhibits dipole-dipole interactions is acetone (CH3COCH3). London dispersion forces: London dispersion forces are the weakest type of intermolecular force. They are attractive forces that occur between all types of molecules and result from the temporary separation of charge that occurs as a result of the movement of electrons within a molecule. An example of a molecule that exhibits London dispersion forces is hexane (C6H14).

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Answer:

A wave is phenomenon that transfers energy from one point to another through a disturbance without affecting the matter.

Explanation:

A wave is phenomenon that transfers energy from one point to another through a disturbance without affecting the matter.

The solvent in terms of solid solution alloys is known as C: "the element that is dissolving the other elements/substances."

A solvent in a solid solution is a substance that is dissolved in a solid, forming a homogeneous mixture. The solvent molecules are dispersed throughout the solid matrix, and the properties of the mixture depend on the properties of both the solvent and the solid. Examples of solid solutions include alloys, where one metal is dissolved in another, and ceramics, where one oxide is dissolved in another.

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To maintain an H2 concentration of 0.42 M, a pressure of approximately 518.52 atm of hydrogen is needed.

The Henry's Law constant relates the concentration of a gas in a liquid to the partial pressure of the gas above the liquid. In this case, the Henry's Law constant for H2 is given as 8.1 × 10^(-4) mol/(L·atm) at 25°C.

To determine the pressure of hydrogen needed to maintain an H2 concentration of 0.42 M, we can use Henry's Law equation:

C = k × P

Where:
C is the concentration of H2 in Molarity (M)
k is the Henry's Law constant (mol/(L·atm))
P is the partial pressure of H2 in atmospheres (atm)

Given:
C = 0.42 M
k = 8.1 × 10^(-4) mol/(L·atm)

Rearranging the equation, we have:

P = C / k

Substituting the given values:

P = 0.42 M / (8.1 × 10^(-4) mol/(L·atm))

Now, let's calculate the pressure:

P ≈ 518.52 atm

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To make a buffer with pH 4.76 from 500 mL of 0.1 M solution of sodium acetate, you can add 25 mL of the 1 M solution of HCl to it.

According to the Henderson-Hasselbalch equation used for the calculation of buffer pH:

\(pH = pK_{a} + log\frac{[base]}{[acid]}\)
when the pH = pKa (as is here) then:

\(log\frac{[base]}{[acid]} = 0\)
so:
\(\frac{[base]}{[acid]}=1\)

This means that [base]=[acid]. The easiest way to generate acid here (because sodium acetate is the basic component), is to add strong acid to the solution, which will effectively transform sodium acetate into acetic acid.

The amount of acid needed is equal to half of the starting amount of sodium acetate:

c = n/V, so n = c * V = 0.1 M * 0.5 L = 0.05 mol of NaOAc

0.05 mol / 2 = 0.025 mol of HCl

In order to add the smallest volume of acid possible (so as to not reduce buffer capacity), we can use 1 M solution of HCl.

c = n/V, so V = n/c = 0.025 mol / 1 M = 0.025 L = 25 mL of 1 M HCl

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