Which of the following is an Arrhenius base?
A. KNO3
B. H2SO4
C. C6H12O6
D. KOH

Answer:

(with reference to a solid) become or cause to become incorporated into a liquid so as to form a solution.

Answer:

Explanation:

Substances which have their density less than the density of water that's 1 g/cm³ will float on it.

From the question the substance with it's density less than that of water is solid C so it's likely for it to float on water.

Hope this helps you

The correct answer is exergonic; catalyzed for Curve B and exergonic; uncatalyzed for Curve A.

Curve A and Curve B represent the same chemical reaction under two different conditions. Curve B represents a reaction catalyzed by an enzyme, which speeds up the reaction rate.

This is an exergonic reaction, meaning it releases energy.

Enzymes work by lowering the activation energy needed for the reaction to occur, thus increasing the rate at which the reaction takes place. In contrast, Curve A represents the same exergonic reaction but in an uncatalyzed state, meaning no enzyme is present to accelerate the process.

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The second reaction, C2H6(g) + 5O2(g) → 2 CO2(g) + 3 H2O(g), is least likely to be an elementary step in a reaction mechanism. This is because it involves the simultaneous collision of seven molecules, which is very unlikely to occur in a single step.

Elementary steps usually involve the collision of one or two molecules, or the breaking or formation of a bond between two atoms or molecules. The other reactions listed all involve one or two molecules colliding, or the breaking or formation of a bond between two atoms or molecules, and are more likely to be elementary steps in a reaction mechanism.

This is because the probability of multiple molecules colliding simultaneously is lower than that of a single molecule colliding with another molecule.

Therefore, the second reaction listed, C2H6(g) + 5O2(g) → 2 CO2(g) + 3 H2O(g), is least likely to be an elementary step in a reaction mechanism due to the large number of particles involved in the collision. Instead, this reaction is likely to proceed through a series of multiple elementary steps that involve the sequential breaking and formation of multiple bonds between atoms and molecules.

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4.2228 g of solid potassium sulfide should be added to make an aqueous solution of 0.180 M potassium sulfide for an experiment in lab, using a 300 ml volumetric flask.

The given molarity of the aqueous solution of potassium sulfide is 0.180 M and the volume of the solution is 300 mL. We are required to find out the amount of solid potassium sulfide required to make the solution.

The formula to calculate the number of moles is: Number of moles = Molarity x Volume (in liters) 1. Convert the volume into liters.300 mL = 0.3 L2. Substitute the given values in the above formula.Number of moles = 0.180 M x 0.3 LNumber of moles = 0.054 mol3. The molecular formula of potassium sulfide is K2S. It means there are two moles of K for one mole of K2S. Hence, we can calculate the moles of K.Number of moles of K = 2 x 0.054

Number of moles of K = 0.108 mol4. The molar mass of K is 39.1 g/mol. Hence, we can calculate the mass of K required to make 0.108 mol.Number of grams of K = Number of moles x Molar massNumber of grams of K = 0.108 mol x 39.1 g/mol

Number of grams of K = 4.2228 g. Hence, 4.2228 g of solid potassium sulfide should be added to make an aqueous solution of 0.180 M potassium sulfide for an experiment in lab, using a 300 ml volumetric flask.

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Answer:

Ionic compounds dissolve in water because the water molecules hydrate the ions.

Explanation:

To dissolve an ionic compound, the water molecules must be able to stabilize the ions that result from breaking the ionic bond.

They do this by hydrating the ions.

Water is a polar molecule. It has a permanent dipole.

The

O

atom has a partial negative charge, and the

H

atoms have a partial positive charge.

When an ionic compound is added to water, the anion is attracted to partially positive hydrogen atom of water and cation is attracted to partially negative oxygen atom of water.

Ionic compound or electrovalent compound is a type of compound  which is formed between the  two elements when there is an exchange of electrons which takes place between  the atoms resulting in the formation of ions.

When the atom looses an electron it develops a positive charge and forms an ion called the cation while the other atom gains the electron and develops a negative charge  and forms an ion called the anion.

As the two atoms are oppositely charged they attract each other which results in the formation of a bond called the ionic bond.

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The physical states represented by each graph region are;

As time proceeds, the particles become less mobile and more ordered in structure.

A change of state refers to the processes by which matter changes from one physical state to another.

A change of state of matter occurs when heat is added or removed from a substance.

The stages of matter are:

The processes of change of state include;

For pure substances, a change of state occurs at a definite temperature.

This property is used to determine the purity of substances.

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The orbitals used to form the carbon-carbon σ bond between the underlined carbons are sp3 hybrid orbitals. This bond is formed through the overlap of one sp3 hybrid orbital from each carbon atom, resulting in a strong and stable bond with tetrahedral geometry around each carbon atom.

In organic chemistry, carbon-carbon sigma (σ) bonds are formed when two carbon atoms share electrons between their overlapping orbitals. Specifically, in the case of the underlined carbons, the orbitals used to form the carbon-carbon σ bond are the hybridized sp3 orbitals.

In the sp3 hybridization process, one s orbital and three p orbitals of the carbon atom mix together to form four hybrid orbitals with a tetrahedral geometry. These hybrid orbitals are used to form covalent bonds with other atoms. In the case of carbon-carbon σ bond formation, the sp3 hybrid orbitals of each carbon atom overlap to form a strong covalent bond that allows for the sharing of electrons.

Overall, the sp3 hybridization of carbon is a crucial process in the formation of carbon-carbon σ bonds and is an important concept to understand in organic chemistry.

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Answer:

Human exhale

Explanation:

When humans exhale-carbon is that which all humans produce=18% of all carbon output

a. NH4NO3: acidic b. AgNO3: neutral c. Na2CO3: basic d. Ca(CIO4)2: acidic

The acidity or basicity of salt can be determined by identifying the acid and base used to form the salt and then analyzing the relative strength of the acid and base. If the acid is strong and the base is weak, the resulting salt will create an acidic solution when dissolved in water. If the acid and base are weak, the resulting salt will create a basic solution when dissolved in water.

If the acid and base are strong, the resulting salt will create a neutral solution when dissolved in water. For example, in the case of NH4NO3, NH4+ is the conjugate acid of the weak base NH3, and NO3- is the conjugate base of the strong acid HNO3. Since the conjugate acid NH4+ is soft and the conjugate base NO3- is neutral, the resulting salt NH4NO3 will create an acidic solution when dissolved in water.

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Answer:

the compound formed between nitrogen and magnesium is Magnesium Nitride

Answer:

1 not

2 not

3 not

4 balanced

5 not

6 not

7 balanced

Explanation:

the amount of elements must be equal in the reactant and products

Answer:

John Dalton

John Dalton, an English chemist and meteorologist, is credited with the first modern atomic theory based on his experiments with atmospheric gases.

The reaction which is half-cell reactions occurring in a Daniell cell the one which is oxidation is:   Zn(s)→Zn²⁺(aq)+2e⁻.

The Daniell cell is a type of electrochemical device developed in 1836 by British chemist and meteorologist John Frederic Daniell. It consists of a copper pot containing a copper (II) sulphate solution, a zinc electrode, and an unglazed earthenware container containing sulfuric acid. Using a second electrolyte to absorb the hydrogen created by the first, he developed a solution to the hydrogen bubble issue that was discovered in the voltaic pile. Sulfuric acid can be replaced by zinc sulphate. The Daniell cell represented a significant advancement over the earlier battery development technologies.

The International System of Units' volt, the unit of electromotive force, has its modern meaning based on the historical definition of the Daniell cell. The electromotive force of the Daniell cell would be around 1.0 volts according to the definitions of electrical units that were put forward at the 1881 International Conference of Electricians. The standard potential of the Daniell cell at 25 °C is really 1.10 V according to modern specifications.

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The rate of decomposition of XO2 after 1 hour : \(\tt A=A_o.e^{-1.08}\)

Given

the half-life 38.6 min

time of decomposition = 1 hour

Required

the rate of decomposition

Solution

First-order reaction :

\(\tt A=A_o.e^{-kt}\)

the half life=t1/2 :

\(\tt t\frac{1}{2}=\dfrac{ln~2}{k}\)

so the rate constant (k) :

\(\tt k=\dfrac{ln~2}{38.6}=0.018\)

The rate after 1 hour=60 min :

\(\tt A=A_o.e^{-0.018\times 60}\\\\A=A_o.e^{-1.08}\)

The complete word equation for the rusting of iron is; iron + oxygen + water → hydrated Iron III oxide.

The term rusting has to do with the process by which iron reacts with moisture in the presence of oxygen and forms a flaky substance that reduces the tensile strength of the iron. We know that the process of rusting is an example of an unwanted oxidation reaction and this is why the iron must be protected from rusting.

Thus, the reactants that we can find in the rusting of iron are iron metal, water and oxygen. This is a chemical change because the compound that is produced is quite different in terms of chemical composition from the reactants.

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The assumed or arbitrary molarity of anions in the chemist's solution is found out to be 2.17 M.

Since neither the mass of magnesium bromide  and the volume of the volumetric flask are not given, one can assume arbitrary values and you could modify them whenever you want, thus, let 50.0g of magnesium bromide to be the measured out amount of solute and a 250-mL volumetric flask where the solution is prepared, so the final volume of the solution is 250 mL after the addition of distilled water. In this manner, the bromide anions moles, taking into account there are two bromide moles per magnesium bromide moles giving the value of 0.543 mols.

The molarity can be calculated as follows:

M= 0.543 mol Br-/0.250 L= 2.17 M

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Answer:

To be stable an atom will gain, lose, or share electrons to complete the outer most energy level (electron shell). Octet Rule because levels 2 and 3 need 8 electrons to be stable.

The dipole moment of gaseous AgCl is 11.5 D, and its ionic character is 78.1%. This means that 78.1% of the molecule’s bond is ionic and the remaining 21.9% is covalent.

A molecule’s bond is an attraction between atoms that allows the formation of chemical compounds. These bonds are formed when the electrons in the outermost shells of the atoms are shared or exchanged. There are two types of bonds, ionic and covalent. Ionic bonds form when the atoms of two different elements exchange electrons, while covalent bonds form when the atoms share electrons. This type of bonding is important in the structure of molecules, as it allows them to form stable compounds. Molecule bonds can be either single, double, or triple, depending on how many pairs of electrons are involved in the bond.

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Carbon dioxide is transported through the blood primarily as bicarbonate. The correct answer is Option B.

Carbon dioxide (CO₂) is a colorless, odorless, and tasteless gas that is one of the most critical compounds on the planet. It is the waste product of respiration and is also produced by burning fossil fuels such as coal, oil, and gas.

Carbon dioxide (CO₂) is important for maintaining the body's acid-base balance. Carbon dioxide is converted to bicarbonate in the blood and transported to the lungs for expulsion by the respiratory system.

Therefore, it can be inferred that Carbon dioxide is transported through the blood primarily as bicarbonate.

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Tritiated hydrogen (3H) differs from hydrogen (1H) in that -3H has 2 more neutrons than 1H.

Tritiated hydrogen (3H) is a radioactive isotope of hydrogen that contains two additional neutrons compared to the stable isotope of hydrogen, which is hydrogen-1 (1H). The atomic nucleus of hydrogen-1 consists of a single proton and no neutrons, while tritiated hydrogen (3H) has one proton and two neutrons in its nucleus.

The addition of two neutrons in tritiated hydrogen (3H) increases its atomic mass, making it heavier than hydrogen-1 (1H). The presence of extra neutrons also affects the stability and radioactive properties of tritiated hydrogen. The unstable nature of 3H leads to its radioactive decay over time, emitting beta particles in the process.

Due to its radioactive nature, tritiated.

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The mass of iron should be produced if 11. 0g of aluminum reacts with 30. 0g of iron (III) oxide is 10.50 g.

To determine the mass of iron produced, we need to use stoichiometry and the balanced chemical equation for the reaction between aluminum and iron(III) oxide.

The balanced chemical equation is:

2 Al + \(Fe_{2} O_{3}\) →  + 2 Fe

From the equation, we can see that 2 moles of aluminum react with 1 mole of iron(III) oxide to produce 1 mole of iron.

First, we need to determine the limiting reactant by comparing the number of moles of aluminum and iron(III) oxide.

Moles of aluminum = mass of aluminum / molar mass of aluminum

= 11.0 g / 26.98 g/mol (molar mass of aluminum)

= 0.407 mol

Moles of iron(III) oxide = mass of iron(III) oxide / molar mass of iron(III) oxide

= 30.0 g / 159.69 g/mol (molar mass of iron(III) oxide)

= 0.188 mol

Since the stoichiometric ratio of aluminum to iron(III) oxide is 2:1, we can see that 0.188 mol of iron(III) oxide requires 0.376 mol of aluminum. However, we have only 0.407 mol of aluminum, which is in excess.

Therefore, the limiting reactant is iron(III) oxide. The amount of iron produced is determined by the moles of iron(III) oxide used. Moles of iron = 0.188 mol (same as moles of iron(III) oxide)

Now we can calculate the mass of iron produced using its molar mass (55.85 g/mol):

Mass of iron = Moles of iron × Molar mass of iron

= 0.188 mol × 55.85 g/mol

= 10.50 g

Therefore, the mass of iron produced is approximately 10.50 grams.

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Answer:

2.43 grams are needed

Explanation:

I did the test

Hope this helps :)

Answer: It would evaporate. Random higher energy molecules in the surface and in the air will add energy by collision to the water molecules leading some of them to escape the liquid which is evaporation.

Explanation:

Answer:It would evaporate. Random higher energy molecules in the surface and in the air will add energy by collision to the water molecules leading some of them to escape the liquid which is evaporation.

Explanation:

Additive is the  type of combination of two chemicals produces an effect that is equal to their individual effects taken together. Thus, option (A) is correct.

As the baseline effect in approaches assessing whether medications have a synergistic impact, the additive effect can be utilized to identify synergy. A synergistic effect is comparable to an additive effect in that it has a bigger combined effect than the additive effect.

When two medications are combined, it can generate a 2+2 > 4 effect. Although the synergistic impact is more prevalent, the additive effect may be detected in the majority of combination medicines. If the combined impact of two pharmaceuticals in combination treatment is less than the total of the effects of the two drugs working separately, this is referred to as an antagonistic effect, and the drugs are rarely prescribed together in the same therapy.

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A calibration curve is a regression model that uses the instrument's reaction to known standards to forecast the unknown concentrations of interest-related analytes.

How do you calculate calibration curve?

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Dowsing is a practice that lacks scientific evidence and is considered pseudoscience. It is not based on any established scientific principles. The supposed ability to detect underground water using dowsing rods or sticks is not supported by empirical data or a sound theoretical foundation.

The shaking or movement of the stick during dowsing is often attributed to unconscious muscular movements or the ideomotor effect, where the person's subconscious mind influences their physical actions without conscious awareness. This can lead to a false belief that the stick is indicating the presence of water.

Dowsing is based on faulty reasoning because it relies on subjective interpretations and personal beliefs rather than objective measurements or scientific methods. The lack of controlled experiments, consistent results, and the inability to provide a scientific explanation undermine its credibility.

In scientific terms, the ability to detect underground water or other substances typically relies on geophysical surveys, geological analysis, or other established scientific techniques. These methods involve objective measurements, data analysis, and empirical evidence, which are fundamental to the scientific process.

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Answer:

acceleration(a)=2m/s²

Explanation:

initial velocity(u)=0m/s

final velocity (v)=20m/s

time taken (t)=10sec

now

v=u+at

20=0+a*10

a=2m/s²

Answer:

2.8 X 10-5s in standard notation is 28-5s

Explanation:

Multiply 2.8 by 10

Answer: Lanthanide or Lanthanides

Explanation: Sorry that I don’t have an explanation. I just answered the question correctly myself. <33

The lanthanide and actinide are present in the periodic table as a transition metals.

Periodic table is defined as a tabular arrangement of chemical elements ordered by increasing atomic number and element groups.

The latest periodic table has an ordered grouping of the 118 known chemical elements.

Lanthanide is defined as any of the elements with rising atomic numbers beginning with lanthanum or cerium and ending with lutetium.

Lanthanide are rarely found on earth i.e. they are called rare earth metals.

Actinide is defined as any of the elements with increasing atomic numbers beginning with actinium or thorium and ending with lawrencium.

Actinide are the radioactive metals.  

Thus, the lanthanide and actinide are present in the periodic table as a transition metals.

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