the scientist who discovered carbon dioxide gas​

The original solution used to make the solutions for the standard curve was prepared by dissolving of 2.60g of CoCl₂(molar mass 130. g/mol) in water to make 100 mL of solution. The value of a concentration of the solution is 0.2 M.

The molarity is calculated as

Molarity=moles/volume(in L)

The number of moles for CoCl₂ is

moles=2.60 g×(1 mol/130. g)

moles=0.02 mol

The volume of a solution is 100. mL. Convert it into a litre

volume=100 mL×(1 L/1000 mL)=0.1 L

Plug all values in the formula

Molarity=(0.02 mol/0.1 L)

Molarity=0.2 mol/L

Molarity=0.2 M (∵M=mol/L)

Therefore, the concentration of a solution is 0.2 M.

Your question is incomplete but the complete question is

The original solution used to make the solutions for the standard curve was prepared by dissolving of 2.60g of CoCl₂(molar mass 130. g/mol) in enough water to make 100 mL of solution. What is the molar concentration of the solution?

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Answer:

If an iron atom loses 3 electrons, it will have a charge of +3.

Explanation:

When an atom loses or gains electrons, it forms an ion with a positive or negative charge, respectively. In the case of iron (Fe), the neutral atom has 26 electrons. By losing 3 electrons, it will have a total of 23 electrons remaining. Since the number of protons in the nucleus remains the same (atomic number of 26), but the number of electrons has decreased, the resulting ion will have a net positive charge. In this case, since 3 electrons are lost, the iron ion will have a charge of +3.

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Answer:

C

Explanation:

Answer:

Pure Water  

Explanation:

Battery acid is well and acid

Bleach is a base

Ocean water is impure so it could lean either way

Answer:

0.736

Explanation:

*I am not sure what you mean by "carbon tetrahedral". I'm assuming you are just referring to individual carbon.*

To find the mole percent, you need to (1) convert grams benzene and grams carbon to moles (via their molar masses) and then (2) calculate the mole fraction (via the mole fraction formula).

(Step 1)

Benzene = C₆H₆

Molar Mass (C₆H₆) = 6(12.01 g/mol) + 6(1.008 g/mol)

Molar Mass (C₆H₆) = 78.108 g/mol

70 g C₆H₆          1 mole
---------------  x  ------------------  =  0.896 mole C₆H₆
                         78.108 g

Molar Mass (C) = 12.01 g/mol

30 g C           1 mole
------------  x  -----------------  =  2.50 mole C
                       12.01 g

(Step 2)

                                           moles solute
Mole Fraction  =  ----------------------------------------------
                              moles solute + moles solvent

                                              2.50 mole C
Mole Fraction  =  -------------------------------------------------  =  0.736
                             (0.896 mole C₆H₆ + 2.50 mole C)

Answer:

iron, it is more dense than aluminum

Explanation:

Answer:

Aluminium

Explanation:

For the reactions shown;
a) MgCl2 + H2SO4 → MgSO4 + 2 HCl

c) 6K + Al2O3 → 3K2O + 2Al

d) 2H2O ----> 2H2 + O2

e) 2C4H10 + 13O2 → 8CO2 + 10H2O

f) will not proceed

g) Will proceed

h) Will proceed

i) Will not proceed

j) Will not proceed

A balanced chemical reaction is a chemical equation that represents equal numbers of atoms of each element involved in the reaction, ensuring that the same amount of matter is present before and after the reaction takes place. The coefficients in the equation indicate the relative proportions of reactants and products.

In the case of the replacement reactions, we know that the substance that is higher in the electrochemical series will replace the substance that is lower in the series as shown.

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Answer:

b, H2O(s) r H2O(g)

Explanation:

entropy is heat, so increase in heat would mean water gets evaporated or melted, or both in this case. so the only choice above that showed increase in heat is from solid(ice) to gas(water vaper) due to increase in heat in the reaction.

I am only in 6th grade so all I have to say is good luck and I wish you the best on that quiz.

The placement of electrons in orbitals surrounding an atomic nucleus is known as electronic configuration

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To neutralize 25.0 mL of 0.100 M HCl, 8.33 mL of 0.150 M Ba(OH)₂ is required.

The balanced chemical equation for the reaction between HCl and Ba(OH)₂ is:

2HCl + Ba(OH)₂ → BaCl₂ + 2H₂O

From the equation, we can see that 2 moles of HCl react with 1 mole of Ba(OH)₂. Therefore, to neutralize 1 mole of HCl, we need 0.5 moles of Ba(OH)₂.

We are given the volume and molarity of HCl, so we can calculate the number of moles of HCl present:

moles of HCl = volume × concentration = 25.0 mL × 0.100 mol/L = 0.00250 moles

To neutralize this amount of HCl, we need half as many moles of Ba(OH)₂:

moles of Ba(OH)₂ = 0.5 × moles of HCl = 0.5 × 0.00250 moles = 0.00125 moles

Now we can use the concentration and the number of moles of Ba(OH)₂ to calculate the volume of Ba(OH)₂ required:

volume of Ba(OH)₂ = moles / concentration = 0.00125 moles / 0.150 mol/L = 0.00833 L

Finally, we can convert the volume to milliliters:

volume of Ba(OH)₂ = 0.00833 L × 1000 mL/L = 8.33 mL

Therefore, to neutralize 25.0 mL of 0.100 M HCl, 8.33 mL of 0.150 M Ba(OH)₂ is required.

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The type of bond that will form between carbon and hydrogen is covalent bond.

Covalent bond is a type of chemical bond where two atoms are connected to each other by the sharing of two or more electrons.

In chemistry, the carbon-hydrogen bond (C−H bond) is a chemical bond between carbon and hydrogen atoms that can be found in many organic compounds. This bond is a covalent, single bond.

It can be formed because carbon shares its outer valence electrons with up to four hydrogen atoms.

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the reactant (CaCO3) is equal to the sum of the products (CaO and CO2), making the correct answer: Reactants and products are equal in the chemical reaction.

The balanced equation for the reaction is:

CaCO3 → CaO + CO2

This means that one mole of CaCO3 produces one mole of CaO and one mole of CO2.

what is chemical reaction?

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another. In other words, it is a process in which one or more substances, the reactants, are converted into one or more different substances, the products. During a chemical reaction, the atoms in the reactants rearrange to form new chemical bonds, resulting in the formation of different molecules. The chemical reaction is usually accompanied by a release or absorption of energy, which can be in the form of heat, light, or sound. Chemical reactions are fundamental to many natural and artificial processes, including metabolism, combustion, and the production of various materials.

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a) The selectivity of a reaction is defined as the ratio of the rate of formation of the desired product to the sum of the rates of formation of all products. In this case, we have two parallel reactions: A ⟶ D and A ⟶ U. The selectivity (S) can be calculated as:

S = (rate of formation of D) / (rate of formation of D + rate of formation of U)

b) Manipulating the concentration of species A (CA) can affect the selectivity by altering the reaction rates of the individual pathways. By increasing or decreasing the concentration of A, we can favor one reaction pathway over the other, thereby increasing selectivity.

To justify this, let's consider the rate equations for the two reactions:

Rate of formation of D = k0 * CA

Rate of formation of U = k11 * CA

From the rate equations, it is clear that the rates of formation for both D and U are directly proportional to the concentration of A (CA). By increasing CA, both reaction rates will increase. However, the relative increase in the rate of the desired product (D) will be larger compared to the increase in the rate of the undesired product (U) if the rate constants (k0 and k11) are significantly different.

Thus, by manipulating the concentration of A, we can adjust the ratio of the reaction rates and bias the system towards the desired product, thereby increasing selectivity.

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The mass of the sample is the product of its volume and density. The mass of the zinc sample is 457.2 g.

What is density?

Density of a sample is its measure of mass per unit volume. It tells how much denser the substance is in a given volume. The volume of the substance is the space occupied by it.

Volume of a solid  is the product of its length, breadth and height.

Given the dimensions of Zn sample is 2.5, 4 and 6 cm.

volume = 2.5 × 4 × 6 cm

            = 60 cm³

Density = 7.62 g/cm³.

Mass of the sample is the product of its volume and density. Thus, mass of zinc sample is:

mass of Zn = volume × density

                   =  7.62 g/cm³ × 60 cm³

                   = 457.2 g.

Therefore, the mass of the Zn sample is 457.2 g.

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Answer and explanation

The solvent in the graph is water (H2O), water tells us that these substances dissolve at different amount of water, and the dissolvation is different in different temperatures in water. For example, NaCl readily dissolves in water.

Answer:

In the cells.

Explanation:

Condensation reaction is a chemical reaction where two molecules combine to form a larger molecule, releasing a small molecule. This process is crucial for the synthesis of biopolymers, complex carbohydrates, fatty acids, and lipids, as well as the formation of proteins and nucleic acids.

The reaction that produces large molecules by linking small molecules is known as a condensation reaction. A condensation reaction, also known as dehydration synthesis, is a type of chemical reaction that occurs when two molecules react to form a single molecule, with the loss of a small molecule like water. It is a process in which two molecules combine to form a larger molecule, and in the process, a small molecule is released.

A reaction occurs when a small molecule, such as water, is lost from two different molecules, allowing the molecules to combine to form a new and larger molecule. When the reaction takes place, the smaller molecules are combined to form larger molecules by losing small molecules such as water, ammonia, and hydrogen chloride. In other words, a condensation reaction is a reaction in which molecules combine to form larger molecules, resulting in the removal of a small molecule such as water or methane.

In the process of condensation reaction, content loaded that are composed of numerous small molecules are combined to create large molecules, such as the combination of amino acids to form proteins or the linking of nucleotides to form DNA. In other words, it is the reverse of hydrolysis, where water is added to break down complex molecules into smaller ones. The process of condensation reaction plays an essential role in the synthesis of biopolymers such as proteins and nucleic acids, as well as the formation of complex carbohydrates, fatty acids, and lipids.

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Cu2S, also known as copper(I) sulfide, is an ionic compound.

Ionic compounds are formed through the transfer of electrons between atoms. In the case of Cu2S, copper (Cu) is a metal, and sulfur (S) is a nonmetal. Metals tend to lose electrons to attain a stable electron configuration, while nonmetals tend to gain electrons.

In the formation of Cu2S, copper loses two electrons to form Cu+ ions, and sulfur gains two electrons to form S2- ions.

The resulting Cu+ and S2- ions are held together by electrostatic forces of attraction due to their opposite charges. This electrostatic attraction between the ions forms the ionic bond. In an ionic compound like Cu2S, the atoms are arranged in a crystal lattice structure.

Therefore, Cu2S is classified as an ionic compound.

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Answer:

500K

Explanation:

We use Charle's law that states that at a constant pressure the volume of a given mass of a gas varies linearly with absolute temperature of the gas.

V ∝ T

V = kT

∴ k is the proportionality constant

v/T = as it a ratio between volume and temperature the value of k would be a constant quantity.

Therefore it can be written as:

v1 / T1 = V2 / T2

Now solving the question:

V1 = 600 torr

T1 = 300 K

V2 = 1000 torr

T2 = ?

600/300 = 1000/T2

T2= (1000 x 300)/600

T2= 500 K

Answer: The second reaction took place at a higher temperature

Explanation:

Rate is affected by temperature, as higher temperatures cause the reacting molecules to have more energy.

Collision theory states that in order for a reaction to occur, each reacting molecule must collide with one another in the correct orientation and with enough energy, called the activation energy.

A higher energy caused by a higher temperature will cause the molecules to collide much more frequently, leading to a higher chance of a successful collision, and with more energy to satisfy the activation energy.

Therefore, the second reaction must have taken place at a higher temperature, since the molecules had more energy than the first reaction leading to a higher rate of reaction, and a higher rate constant.

Answer:

Action and Reaction.

Explanation:

Newton has given three laws. When discussing Newton's laws of motion, the most likely used terms when talking about Newton's third law of motion are action and reaction. According to this law, for every action there is an equal and opposite reaction.

Answer:

His third law states that for every action (force) in nature there is an equal and opposite reaction. In other words, if object A exerts a force on object B, then object B also exerts an equal and opposite force on object A.

Explanation:

Rabbits are eaten by predators such as foxes and wild dogs.

In a biological interaction known as predation, one organism—the predator—kills and consumes another—its prey. It belongs to a group of widespread feeding habits that also includes parasitoidism, micropredation (which typically does not result in host death), and parasitism (which always does, eventually). It differs from scavenging on dead prey, even though many predators also scavenge, and it overlaps with herbivory because predatory seed predators and destructive frugivores are also herbivores.

Predators may actively seek for, pursue, or simply wait for their victim while remaining hidden. The predator decides whether to assault its prey after spotting it. This may entail an ambush or a predatory pursuit, sometimes following a prey stalk.

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Answer: Interspecific competition.  

Explanation: Just took this same test.

The answer would be in an equilibrium or closed system.

Because there will be no change in the given chemical reaction. Even if you want to add the catalyst in the given closed system there would be equal amount of sharing in both forward and backward reactions and hence no changing.

Equilibrium can only be acquired in a closed system where the reaction takes place in a closed holder or a vessel and nothing is lost i.e., reactants or products are lost.

So, in conclusion the phase changes in many substances are reversible and a phase change just like a chemical reaction may takes place in an equilibrium, closed system.

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In this reaction, the water is considered a base.

When ammonia molecules react with water, they form a solution that contains ammonium ions and hydroxide ion.

In this reaction, water will act as a base.This is because it is accepting hydrogen ions from the ammonia molecules and reacting with them to form a solution that contains both ammonium and hydroxide ions.

This is an example of a neutralization reaction, where an acid and a base react to form a neutral solution.

The water is classified as a reactant, as it is consumed and converted into the product solution.

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Explanation:

Since we are asked to round all answers to three decimal places, we will use the rounded values in our calculations.

To find the probability for each case, we need to calculate the length of the interval divided by the length of the total range.

1. The probability that the number will be exactly 18 is 0. Since the number is continuous, the probability of selecting a single value is zero.

2. The probability that the number will be between 18 and 20, inclusive, is (20 - 18.3) / (24.3 - 16.3) = 1.7 / 8 = 0.212.

3. The probability that the number will be between 18 and 20, exclusive, is (20 - 18) / (24.3 - 16.3) = 2 / 8 = 0.250.

4. The probability that the number will be less than 18 or greater than 20 is ((16.3 - 18) + (24.3 - 20)) / (24.3 - 16.3) = (-1.7 + 4.3) / 8 = 2.6 / 8 = 0.325.

5. The probability that the number will be less than 20 or greater than 18 is ((16.3 - 18.3) + (24.3 - 20)) / (24.3 - 16.3) = (-2 + 4.3) / 8 = 2.3 / 8 = 0.288.

Therefore, the probabilities are as follows:

- The probability that the number will be exactly 18 is 0.

- The probability that the number will be between 18 and 20, inclusive, is 0.212.

- The probability that the number will be between 18 and 20, exclusive, is 0.250.

- The probability that the number will be less than 18 or greater than 20 is 0.325.

- The probability that the number will be less than 20 or greater than 18 is 0.288.

Answer:

1.02 N/mm2

Explanation:

We can see that the pressure is applied on the small weight that covers the opening.

The area of the circular opening is π(0.512 mm)

= 0.824 mm2

Pressure = Pressure = Force / Area

=  (0.847 N) / (0.824 mm2)

= 1.02 N/mm2

Seven electrons are altogether present in the neutral chlorine atom's maximum occupied energy level.

The outer energy level that electrons in an atom occupy is designated by the period number (abbreviated as "n").

The amount of energy levels that an element has depends on the period number it is in.

The number of electrons in atoms rises within the same orbit as we travel through a period in a periodic table from left to right.

So, we may conclude that the period number indicates the maximum energy level that an atom's electrons are currently occupying.

The electrons' greatest energy level is indicated by the period number.

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