Beryllium, the first element in group 2, has an atomic number of 4. The second element in this group has an atomic number of.

Prior to the industrial revolution, the previous highest level of CO2 concentration in the atmosphere over the prior 400,000 years was 300 ppm.

Before the Industrial revolution, the carbon dioxide concentration in the atmosphere was lesser as there was not much carbon dioxide waste that was produced. The highest level of carbon dioxide recorded in the air was 300 ppm at that time.

After the industrial revolution, the concentration of carbon dioxide increased. We can see the carbon dioxide concentrations to reach as high as 1.5 trillion tons today. This is because the formation of industries has been increasing since then which produces a lot of waste carbon dioxide.

To learn more about industrial revolution, click here:

https://brainly.com/question/13323062

#SPJ4

Answer:

a. 25.5 moles of Pb will be formed.

b. 54.8 moles of PbO are needed.

c. PbS is the limiting reactant.

Explanation:

1st) It is necessary to write the balanced chemical reaction:

From the balanced chemical reaction we know that 1 mole of PbS reacts with 2 moles of PbO to produce three moles of Pb and 1 mole of SO2.

2nd) Using the stoichiometry of the reaction and a mathematical rule of three, we can calculate the moles of Pb that will be produced from 17 moles of PbO and excess of PbS:

So, 25.5 moles of Pb will be formed.

3rd) Using the stoichiometry of the reaction and a mathematical rule of three, we can calculate the moles of PbO that are needed to make 27.4 moles of SO2 in excess of PbS:

So, 54.8 moles of PbO are needed.

4th) Using the stoichiometry of the reaction we can calculate the limiting reactant:

- Calculation from 17.6 moles of PbS:

From the stoichiometry of the reaction 1 mol of PbS reacts with 2 moles of PbO, so the 17.6 moles of PbS will need 35.2 moles of PbO to react properly, but we have 36g of PbO, so PbO will be the excess reactant and PbS the limiting reactant.

- Calculation from 36 moles of PbO:

We can do this calculation to confirm the previous one:

In this case, we can see that 36 moles of PbO will need 18 moles of PbS to react properly, but we only have 17.6 moles of PbS. Here we confirm that PbS is the limiting reactant.

The chemical reaction that occurs when the positive ion from one compound replaces the positive ion of the other compound is double replacement

What is a double displacement reaction?

This is a type of reaction in which there is an exchange of ion between the reacting agent. The ion in one of the reactant replaces or displaces the ion in the other reactant to produce two new products.

The reaction between sulphuric acid and potassium hydroxide illustrates a double displacement reaction

H₂SO₄ + 2KOH —> K₂SO₄ + 2H₂O

From the above equation, we can see that K and H exchange to produce K₂SO₄ and H₂O

With the above illustration we can answer the given question as follow

AB + CD = AD + CB

The above reaction is a double displacement reaction since A and C exchange to produce AD and CB

Learn more about double displacement reaction:

https://brainly.com/question/13870042

#SPJ1

        The difference between a kelvin (K), which is a division of the kelvin scale, and a degree on the Celsius scale is where zero is. The zero point on the Kelvin scale is at absolute zero, whereas the zero point on the Celsius scale is the freezing point of water. As a result, 0oK equals -273.15oC and 0oC equals 273.15 kelvins.

Answer : C.933.45K

         At 0 degrees Celsius, or 273 Kelvin, water freezes. Also, -273 degrees Celsius are the same as 0 Kelvin. Therefore, multiply the Celsius degree by 273 to convert it to Kelvin. And to convert from Kelvin to Celsius, just take 273 out.

Celsius to Kelvin conversion: Kelvin = Celsius + 273 1.5. The figure of 273 is also used instead of 273.15

Solution :

K = ° C + 273.15

K = 660.3 + 273.15

K = 933.45

Answer :660.3°C = 933.45k

To Learn more About Kelvin 273 celsius, Refer:

https://brainly.com/question/13165448

#SPJ13

When aqueous lead (II) nitrate and aqueous potassium iodide are added to a dish containing water, diffusion occurs before the formation of yellow precipitate.

Diffusion is a process involving the movement of molecules to the region of lower concentration from the region of higher concentration.

When aqueous lead (II) nitrate and aqueous potassium iodide are added to a dish containing water, the compounds would dissociate into ions. Immediately after the dissociation, the ions would start to diffuse through the molecules of water to lower concentration.

After diffusion, the yellow compound lead iodide would form from the reaction between iodide ions in potassium iodide and lead ions from lead nitrate. The yellow compound would later precipitate out of the solution.

The reaction involved between the compound result in potassium nitrate and lead iodide

Lead nitrate (aq) + Potassium iodide (aq) → Lead iodide (yellow precipitate) + Potassium nitrate

To know more about Diffusion

https://brainly.com/question/14852229

#SPJ1

Fatty acids that are broken down for energy productions are utilized for glycolysis.

Although the multiple choices are missing, you might be referring to these multiple choices: (a) Fermentation, (b) Glycolysis, (c) Pyruvate oxidation, (d) Citric acid cycle, (e) Electron transport chain. In that case, the correct answer is (b) Glycolysis.

Glycolysis refers to the breakdown of glucose or sugar (C₆H₁₂O₆), releasing energy and pyruvate (CH₃COCO₂H). Glycolysis is the first stage in the process of cellular respiration in organisms. Cells use glycolysis as a method to produce energy. Glycolysis is found in the great majority of organisms alive today.

Learn more about glycolysis here: https://brainly.com/question/15159050

#SPJ4

The molar absorptivity of the blue dye is greater than the molar absorptivity of the red dye.

The Beer-Lambert Law equation is as follows

A = εcl  

where; ε= molar absorptivity

A= absorbance

l = optical path length

c= molar concentration

The molar absorptivity of the blue dye;

1.30 x 10⁵ M⁻¹cm⁻¹

The molar absorptivity of the red dye :

2.13 × 10⁴ cm⁻¹M⁻¹

This is reason that the blue dye solution appear more intensely colored than the red dye solution

Following are the factors that can affect the molar absorptivity:

1.The amount of light absorbed by the substance for a specific wavelength.

2.The distance that the light travels through the solution.

3.The concentration of the absorbing solution per unit volume.

To learn more about molar absorptivity click here

brainly.com/question/14651113

#SPJ4

In this question, we have a situation where a gas is in constant pressure but changing its volume and temperature, and the best way to solve a situation like this, is through the Charles's gas law formula, which shows the relationship between volume and temperature when the pressure is constant. The formula is:

V1/T1 = V2/T2

We have:

V1 = 0.510 L

T1 = 19°C, but we need it in Kelvin, 292 K

V2 = ?

T2 = 6°C, or 279 K

Now we add these values into the formula:

0.510/292 = V2/279

0.00175 = V2/279

V2 = 0.488 Liters is the new volume

Energy transfers between particles when they collide.

When the particles collide they vibrate and energy get transferred between the particles. The particles that made matter are in constant motion and have high kinetic energy. kinetic energy is equal to heat. Energy is the ability to do work. When energy moves from one place to another place we can say that energy is transferred . so in case of particle s, particles are in continuous motion and colloid with each other and when the particles collide with each other the energy transfer between particles takes place.

Thus, Energy transfers between particles when they collide.

To learn more about energy transfer here

https://brainly.com/question/18404966

#SPJ1

Answer:

in meters its 0.01175

Explanation:

Answer:

0.01175 meters

Explanation:

The molar mass of the acid is  65 g/mol.

We know that the term neutralization is applied to the reaction between an ad and a base that produces salt and water only. In this case, we have been told that  a monoprotic weak acid required 22. 50 ml of 0. 510 m sodium hydroxide to titrate it.

Let us recall that by the principle of the stoichiometry of the chemical reactions, the reaction between sodium hydroxide and a monoprotic acid has to be one is to one and we have to bear this in mind.

Thus;

Number of moles of sodium hydroxide = 22. 50/1000 L *  0. 510  M

= 0.0115 moles

This implies that 0.0115 moles of the acid was required also.

Since;

Number of moles = mass/molar mass

Molar mass =  mass/Number of moles

Molar mass =  0. 75 g /0.0115 moles

= 65 g/mol

Learn more about neutralization:https://brainly.com/question/27891712

#SPJ1

Considering the chemical formula, 3.045 moles of nitrogen N are in 67.0 g of nitrous oxide, N₂O.

Chemical formulas use letters and numbers to represent chemical species. The letters are called chemical symbols and represent the elements present in the chemical species.

The numbers located to the right of each chemical symbol is a subscript that indicates the number of moles of the element present in that compound. If no subscript appears after a chemical symbol, this implies that there is only one atom of that element.

The molar mass of N₂O is 44 g/mole. If the molar mass is the amount of mass that a substance contains in one mole, this means that 1 mole of N₂O contains 44 grams of the compound.

On the other hand, 1 mole (or 44 grams, according to the definition of molar mass) of N₂O contain 2 moles of N. So, you can apply the following rule of three: if 44 grams of the compound contains 2 moles of N, 67 grams of the compound contains how many moles of N?

amount of moles of N= (67 grams× 2 moles of N)÷ 44 grams

amount of moles of N= 3.045 moles

Finally, there is 3.045 moles of N.

Learn more about chemical compound:

brainly.com/question/9763665

#SPJ1

Pendulum shows the path it takes as it swings back and forth and it is because of kinetic energy is converted into potential energy only once

Pendulum is the point mass suspended by the weightless and inextensible string fixed rigidly to support pendulum is also used in scientific instrument and it form because of gravity and in that pendulum potential energy is transformed to the kinetic energy and come back again and weight of pendulum is released and then it get active and gravity pull it back and that's why kinetic energy is converted into potential energy only once

Know more about mechanical energy

https://brainly.com/question/14567080

#SPJ1

A Hydrate is a compound containing H2O molecules. The best-known hydrates are crystalline solids that lose their fundamental structure from the removal of bound water.  Some examples of hydrate are Glauber's Salt ( sodium sulfate decahydrate, Na2.SO4.10H2O), Washing soda ( sodium carbonate decahydrate, Na2CO3∙10H2O), and the double salts known as alums.

In many cases, hydrates are coordination compounds CuSO4∙5H2O is actually [Cu(H2O)4]SO4∙4H2O where four molecules of water of hydration are coordinated to copper ion. Similarly, MgSO4.7H2O is actually [Mg(H2O)6]SO4∙4H2O.

Noble gases and hydrocarbon gases form crystalline hydrates called clathrate compounds which are relatively at low temperatures and pressure.

To know more about Hydrates:

https://brainly.com/question/15724859

The mass percent of the salt is 33.33%

The percentage of a solution's mass that is made up of solutes is known as the mass percent. This percentage is measured in relation to the total mass of the solution.

The term "mass percent composition" also refers to weight percentage. It is referred to as w/w%. The formula for mass percent in a solution is the mass of an element in one mole of the compound divided by the compound's molar mass, then multiplied by 100%.

Total mass of solution = 75g

The mass percent of the salt= 25/75×100%

The mass percent of the salt= 33.33%.

To know more about mass percent visit:

https://brainly.com/question/5394922

#SPJ4

During cellular respiration, oxygen and glucose are converted into water and carbon dioxide. The procedure produces ATP, which is converted into energy, carbon dioxide, water, and other byproducts.

Oxygen might be either present or absent while organisms are respiring. However, the activity is essentially known as "cellular respiration" so because cell seems to "respire" by consuming molecular oxygen (as an electron acceptor) and exhaling carbon dioxide (as an end product).

The process by which glucose is broken down in the presence of oxygen in the mitochondria of animals (animals and plants) to release energy in the form of ATP is referred to as cellular respiration.

To know more about Cellular respiration visit:

https://brainly.com/question/13721588

#SPJ4

Cocaine, amphetamines, caffeine, nicotine, and MDMA (ecstasy) have in common that they all increase the activity of the nervous system (Option a).

The expression stimulant drugs is used in biology and medicine to describe chemical substances that speed up the velocity in which messages are transmitted between nerve cells, which is common to caffeine, nicotine cocaine and ecstasy.

Therefore, with this data, we can see that stimulant drugs are able to increase the velocity in which messages are transmitted in the nervous system.

Learn more about stimulant drugs here:

https://brainly.com/question/14844601

#SPJ1

To determine the total number of elements in a chemical formula is being able to recognise the elements of the chemical formula.

An element is defined as the chemical substance that cannot further be divided by any chemical process into smaller particles.

A chemical formula is a representation for a chemical compound or molecules which contains one or more elements with the number of atoms attached as a subscript.

An example of a chemical formula is NaCl. This chemical formula contains one element of sodium (Na) and one element of chlorine (Cl).

In order to determine the total number of elements in a chemical formula, the elements should be recognised and the subscript attached to the element shows the number of atoms of the element found in that particular formula.

Learn more about chemical elements here:

https://brainly.com/question/26487468

#SPJ1

According to the mole concept, there are 0.02 moles in 6.2 g of calcium phosphate.

According to mole concept,mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.

It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.

It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass  in grams present in one mole  of atoms is its atomic mass.

In the given problem, number of moles is found out by, mass/molar mass

that is,6.2/310= 0.02 moles.

Hence, there are 0.02 moles in 6.2 g of calcium phosphate.

Learn more about mole concept,here:

https://brainly.com/question/12805690

#SPJ1

Answer:

Zinc is more reactive than lead, iron and silver so, zinc reacts with hydrochloric acid to form Zn2+ ions.

Answer:

zn2+

Explanation:

the reason for this answer is that when hydrochloric acid and zinc come together they react to form a stronger ion

The atomic mass of element x is 85.56 amu if 72% of the atoms have a mass of 85 amu and 28% of the atoms have a mass of 87 amu

The atomic mass of an element can be determined by first multiplying the percentage of its isotopes by their atomic mass and then adding the resultants together.

As 72% of the atoms have a mass of 85 amu and 28% have a mass of 87 amu, therefore

atomic mass of element x = (72% × 85) + (28% × 87)

atomic mass of element x = (72/100 × 85) + (28/100 × 87)

atomic mass of element x = (0.72 × 85) + (0.28 × 87)

atomic mass of element x = 61.2 + 24.36

atomic mass of element x = 85.56 amu

Therefore the atomic mass of element x is calculated to be 85.56 amu.

To learn more about atomic mass; click here:

https://brainly.com/question/11065367

#SPJ4

i don't know if you mean C° to F° but in F° the change would be 123.8°

Taking into account the reaction stoichiometry, 1 mole of potassium hydroxide would react with 1 mole of hydrochloric acid

In first place, the balanced reaction is:

KOH + HCl  → KCl + H₂O

By reaction stoichiometry (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:

You can see that the stoichiometric mole ratio of KOH to that of HCl is 1:1. This means that 1 mole of KOH will require 1 mole of HCl.

Learn more about reaction stoichiometry:

brainly.com/question/27807830

brainly.com/question/15288923

#SPJ1

By using the balanced reaction equation of ethane combustion, we can calculate that 12.8 L of carbon dioxide will be produced.

To calculate the answer to this, we need to write the balanced reaction equation:

2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O

Based on this, we can see that 2 moles of ethane produce 4 moles of carbon dioxide. Now, we need to calculate the number of moles (n) of ethane using its mass (m = 8.00 g) and its molar mass (M = 30.07 g/mol):

n = m/M

n = 8.00 g / 30.07 g/mol

n = 0.266 mol

Based on this, we can conclude that 2 * 0.266 mol = 0.532 mol of carbon dioxide was produced. Assuming that carbon dioxide acts as an ideal gas, we can use the ideal gas equation to calculate its volume:

PV = nRT ⇒ V = nRT/P

V - the volume of the gas

n - number of moles of gas (0.523 mol)

R - universal gas constant (0.08206 L*atm/K*mol)

T - temperature in Kelvins (25 °C = 298.15 K)

P - pressure (1.00 atm)

Now we plug all the known values into the equation:

V = 0.523 mol * 0.08206 L*atm/K*mol * 298.15 K / 1.00 atm

V = 12.8 L

You can learn more about balanced reaction equations here:

brainly.com/question/22064431

#SPJ4

Answer:

I think 11 yeah.. try that

Explanation:

Ba(OH)2(aq) + 2HNO3(aq) ==> 2H2O(l) + Ba(NO3)2(aq)  ...  balanced equation

A chemical equation that is balanced has the same number of each type of atom on both sides of the equation. Subscripts are a component of the chemical formulas for the reactants and products that show how many atoms of the previous element there are in each.

note the stoichiometry ...  2 mols HNO3 for each 1 mol Ba(OH)2

Now we can use dimensional analysis and the noted stoichiometry to solve the problem:

32.0 ml HNO3 x 1 L/1000 ml x 0.200 mol / L = 0.0064 mols HNO3 used

0.0064 mol HNO3 x 1 mol Ba(OH)2 / 2 mols HNO3 = 0.0032 mol Ba(OH)2 present

Concentration of Ba(OH)2 = mols/L = 0.0032 mols / 0.0250 L = 0.128 M

To learn more about balanced equation refer to:

https://brainly.com/question/26694427

#SPJ4

The Water does not dissolve sand, but it does dissolve sugar. In order to dissolve the mixture in water. Sand will settle and sugar and water will separated combine to produce a solution.

Sugar can be obtained by the crystallization, while sand can be filtered and separated. The Filtration and evaporation can be used to separate the salt and sand mixture. Sand can be separated by filtering a mixture of sand and salt solution (salt dissolved in water). After filtering, sand remains as a residue on the filter paper. Now it is possible to make common salt by boiling the filtrate.

To learn more about mixture, click here.

https://brainly.com/question/24898889

#SPJ1

The units that are left in each case are;

1) mile

2) atoms

The term conversion factor has to do with the way that we are able to use a given set of numbers to be able to help us to convert from one unit to another. This is very important especially when we are dealing with something that involves calculations and makes the use of computational methods very easy.

Let us now look at the image that has been shown in the question. We have to recall that some units have to cancel out so that we can be able to get the target unit that we are looking for in the course of the conversion as shown.

Learn more about unit conversion:https://brainly.com/question/11543684

#SPJ1

Bases can be formed by the direct combination of the elements that form the bases.

Bases are substances that react with acids to form salt and water only.

Bases are usually oxides or hydroxides of metals.

Bases have the property of turning red litmus blue.

The formation of a base will involve the direct combination of the constituent elements.

For example, the formation of the bases magnesium oxide and ammonia is shown below:

Ammonia: N₂+ 3 H₃ ---> 2 NH₃

Magnesium oxide: 2 Mg + O₂ ---> MgO

Learn more about bases at: https://brainly.com/question/9836972

#SPJ1