uestion 1
This scientist thought that all matter was composed of small, indivisible atoms.
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Thomson
Bohr
Rutherford
Dalton
Schrodinger

The balanced equation for this reaction is:

CH3CH2CH2OH + C6H5N=C=O → CH3CH2CH2OC(=O)N(C6H5)CH3 + H2O

CH3CH2CH2OH + C6H5N=C=O → CH3CH2CH2OC(=O)N(C6H5)CH3 + H2O

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A. the main group element with the valence electron configuration 3s23p1 is in the periodic group p- block element. it forms a monatomic ion with a charge of +3.

B. the main group element with the valence electron configuration 2s22p4 is in periodic group 4, p block element. it forms a monatomic ion with a charge of +4.

The periodic table, also known as the periodic table of the elements, is a rows and columns association of the chemical factors. it's miles widely used in chemistry, physics, and other sciences, and is typically visible as an icon of chemistry.

Periodic table, inside the full periodic desk of the factors, in chemistry, the organized array of all of the chemical factors in order of growing atomic wide variety—i.e., the whole wide variety of protons inside the atomic nucleus.

An atom includes a relevant nucleus which is surrounded by way of one or more negatively charged electrons. The nucleus is undoubtedly charged and consists of one or greater exceedingly heavy particles called protons and neutrons. Atoms are the primary building blocks of depend.

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Answer:

353 ppm

Explanation:

PPM also refers to parts per million, it represents a low concentration of a solution. It represents 0.001 gram or a milligram in 1000 mL, equivalent to 1 mg per liter

Given that;

276 mg of Ca in 780.0 g of water

1 ppm = 1 mg/L

780 g = 780 mL = 0.78 L

Therefore;

= 276 mg/ 0.78 L  

=  353.84mg/L

= 353 ppm

Answer:b

Explanation:

bc

In the given chemical equation, H₃PO₄ is an acid while it's conjugate base is OH⁻.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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Answer:

Magnesium is likely to be less reactive than both strontium and sodium

Answer:

The answer is Magnesium (Mg)

Option 3 accurately represents the essence of an ethogram as an inventory of species-specific behaviors.

An ethogram can be best described as an inventory of the behavior of a particular species. It is a systematic catalog or list of behaviors exhibited by a specific animal species.

An ethogram provides a comprehensive overview of the behaviors displayed by the animals under study, documenting various activities, actions, and patterns of behavior.

While options 1 and 2 are related to visual representations or descriptions of behavior, they do not capture the comprehensive nature of an ethogram. Option 4 refers specifically to behaviors observed in response to an experimental intervention, which is more narrow in scope compared to an ethogram. Therefore, option 3 accurately represents the essence of an ethogram as an inventory of species-specific behaviors.

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Answer: The molality of naphthalene solution is 0.499 m

Explanation:

Density is defined as the ratio of mass and volume of a substance.

\(\text{Density}=\frac{\text{Mass}}{\text{Volume}} \) ......(1)

Given values:

Volume of carbon tetrachloride = 500 mL

Density of carbon tetrachloride = 1.60 g/mL

Putting values in equation 1, we get:

\(\text{Mass of carbon tetrachloride}=(1.60g/mL\times 500mL)=800g\)

Molality is defined as the amount of solute expressed in the number of moles present per kilogram of solvent. The units of molarity are mol/kg. The formula used to calculate molarity:

\(\text{Molality of solution}=\frac{\text{Given mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Mass of solvent (in g)}}\) .....(2)

Given values:

Given mass of naphthalene = 51.2 g

Molar mass of naphthalene = 128.17 g/mol

Mass of solvent = 800 g

Putting values in equation 2, we get:

\(\text{Molality of naphthalene}=\frac{51.2\times 1000}{128.17\times 800}\\\\\text{Molality of naphthalene}=0.499m\)

Hence, the molality of naphthalene solution is 0.499 m

Answer:

Yes

Beryllium is a chemical element with the symbol Be and atomic number 4. It is a steel-gray, strong, lightweight and brittle alkaline earth metal. ... Notable gemstones high in beryllium include beryl (aquamarine, emerald) and chrysoberyl.

Calcium is a mineral that is necessary for life. In addition to building bones and keeping them healthy, calcium enables our blood to clot, our muscles to contract, and our heart to beat. About 99% of the calcium in our bodies is in our bones and teeth.

Answer:

Give the number of significant figures in each measurement. By rule 1, all nonzero digits are significant, so this measurement has three significant figures.

The chemist can conclude that the liquid is gaining heat or experiencing an increase in thermal energy.

Thermal energy in chemistry is the energy transferred from one object to another due to a temperature difference. This type of energy is also known as heat energy and is associated with the motion of molecules within an object. At the molecular level, thermal energy can be seen as the kinetic energy of the molecules which are constantly in motion. When two objects with different temperatures come into contact, heat energy is transferred from the object with the higher temperature to the object with the lower temperature. This process continues until both objects reach thermal equilibrium, meaning that the temperatures of both objects are equal. Thermal energy can also be created by the friction between two objects, or by the combustion of a fuel.

From this observation, the chemist can conclude that the liquid in the vat is undergoing a chemical reaction. To determine the exact nature of the reaction, further analysis would be needed. This could include measuring the rate of temperature increase, the products of the reaction, and the reaction enthalpy.

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The number of mole of O₂ required for the reaction if 15.0 grams of N₂O4 is produced, is 0.326 mole

We'll begin by obtaining the number of mole in 15.0 g of N₂O₄. Details below:

Mole = mass / molar mass

Mole of N₂O₄ = 15 / 92

Mole of N₂O₄ = 0.163 mole

Next, we shall write the balanced equation for the reaction. This is givrn below:

N₂ + 2O₂ -> N₂O₄

From the balanced equation above,

1 mole of N₂O₄ was produced from 2 moles of O₂

Finally, we shall determine the number of mole O₂ required for the reaction. Details below:

From the balanced equation above,

1 mole of N₂O₄ was produced from 2 moles of O₂

Therefore,

0.163 moles of N₂O₄ will be produced from = 0.163 × 2 = 0.326 mole of O₂

Thus, number of mole of O₂ required is 0.326 mole

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Answer:

I say 20 is ur best option

(c) is more soluble at higher because lower concentrations of shift the solubility equilibrium toward and.

The solubility of a substance refers to the amount of that substance that can dissolve in a given amount of solvent at a given temperature and pressure. In this situation, the student is placing a certain mass into different solutions with specific values, and then measures the concentration of ions in each solution after equilibrium is reached.

Based on the data in the table, it can be concluded that:

In summary, the solubility of is more at higher because lower concentrations of shift the solubility equilibrium towards and. It means as the concentration of ions decreases, the solubility of the substance increases.

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Clayey soil can absorb more water due to its comparatively large pore size and ability to hold the water molecules.

Soil is composed of components such as minerals, gas, water and organic matter. It is divided into three components viz. sand, silt and clay.

The ability of a soil to absorb water depends upon its pore size. In clayey soil, it has relatively large pore size so the water molecules can be easily absorbed and stored in the pores unlike sandy soil.

Clay particles have cohesive force between them which helps to hold water molecules together, whereas this cohesive force is absent in sandy soil.

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The solute wether electrolyte or a nonelectrolyte, has the greater effect on the boiling point when a given amount of each solute is dissolved in the same mass of water The nonelectrolyte does because it dissociates into ions.

Solute refers to substances or liquid which can readily dissolve in a solvent. It's concentration is lower to that of solvent.

Therefore, The solute wether electrolyte or a nonelectrolyte, has the greater effect on the boiling point when a given amount of each solute is dissolved in the same mass of water The nonelectrolyte does because it dissociates into ions

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Answer:

D: The electrolyte does because it dissociates into ions.

Explanation:

Answer:

A horizontal row in the periodic table, which signifies the totoal number of electron shells in an element's atom.

Explanation:

Hope this helpss)):

There is nothing that can be done to cause the sub to sink to the bottom of the tub because the boat displaces more water than it weighs, it's already on its way down.

It is a common observation that there are some substances that are able to float in water. This implies that they have the ability to remain above water and be carried by the water from place to place.

We know that an object would float in water when the weight of the object is equal to the weight of water that is displaced by the object. If the objects tends to displace more water than it weighs, the object would sink in water.

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Missing parts:

expert that helps you learn core concepts.

See Answer

Here we have a toy submarine floating in a bathtub. It's a really fancy sub, made out of steel. The sub weighs one pound. When completely submerged, it displaces two pounds of water.

What could you do to cause the sub to sink to the bottom of the tub?

a)Add one pound of sand to the sub's interior.

b)Add one pound of sand to the sub's interior, plus a little more.

c)Nothing. Since the boat displaces more water than it weighs, it's already on its way down.

I know the answer is B but I cant figure out how to explain why with another example

Possible reasons for the actual yield being less than the theoretical yield include incomplete reactions, side reactions, and product loss during separation or purification processes.

The actual yield of a chemical reaction refers to the amount of product obtained in a practical scenario, while the theoretical yield is the maximum amount predicted by stoichiometry calculations. Several factors can contribute to the actual yield being less than the theoretical yield.

These factors contribute to the discrepancy between the actual yield and the theoretical yield.

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5 examples of covalent compounds hydrogen (H₂), oxygen (O₂), nitrogen (N₂), water (H₂O), and methane(CH₄) due to high ionization energy.

Due to their extremely high ionization energy, some elemental atoms are unable to surrender their electrons. While some people might not be able to gain an electron due to low electron affinity. The only other option is to share electrons so that neither a shortfall nor an excess of electrons exists. Covalent bonds are the next bonds to form in such a configuration. It is important to keep in mind that covalent bonds share already existing electrons amongst the atoms rather than contributing to the production of new ones. Covalently bound elements or compounds cannot conduct electricity because there are no free electrons. Covalent bonds, however, are incredibly strong, which is why they produce the strongest elements or compounds.

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Answer:

1) all matter is made up of atoms and molecules 2) these tiny particles are always in motion; the higher the temp. the faster they move 3) at the same temp., heavier particles move more slowly then small particles

Explanation:

Answer:

independent variable: a variable (often denoted by x ) whose variation does not depend on that of another.

dependent variable: a variable (often denoted by y ) whose value depends on that of another.

Explanation:

Answer:

C.) One mole of mercury

Explanation:

You can determine which has the greatest mass by identifying each of their atomic masses. The atomic mass represents the mass of an element per 1 mole.

Gold (Au): 196.97 g/mol

Mercury (Hg): 200.59 g/mol

Barium (Ba): 137.33 g/mol

In this case, one mole of mercury has the greatest mass.

The resonating structures of acetophenone can be drawn by considering the movement of electrons. Acetophenone has a ketone group (C=O) attached to a phenyl ring.

Acetophenone is an o&p-directing group. This means that it directs incoming substituents to the ortho and para positions on the phenyl ring during electrophilic aromatic substitution reactions.

The o&p-directing effect is attributed to the resonance stabilization provided by the delocalized π electrons of the phenyl ring. T

he ortho and para positions on the ring have more electron density due to the delocalization, making them more attractive for electrophilic attack.

To further illustrate, let's consider the addition of a substituent, such as a halogen, to acetophenone. The halogen would preferentially substitute at the ortho or para positions rather than the meta position.

In summary, acetophenone exhibits o&p-directing behavior in electrophilic aromatic substitution reactions due to the resonance stabilization provided by the delocalized π electrons in the phenyl ring. This makes the ortho and para positions more reactive and attractive for electrophilic attack compared to the meta position.

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The number of electrons present in the outermost shell is called valence electrons.

The number of electrons present in the last shell is called valence electrons. The atomic number of sodium is 11 and the atomic number of oxygen is 8.

There is 1 valence electron in sodium. The number of valence electrons in oxygen is 2.

The atomic number of iodine is 53. The number of the valence electron in iodine is 1. The atomic number of calcium is 20. The valence electron in calcium is 2.

Therefore, The number of electrons present in the outermost shell is called valence electrons.

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Answer:

r

I think 1 option okkkkkkkkkkkkk

Explanation:

mhfs4trfsetc fthcfeencfgeh,cbwjh vbytbnmdtuh3lg dl5flnfwk3t kqre,fvbt,klkkkjh

Answer:

A is correct

Explanation:

AU=2x2=4           Au=1x4=4

O=3x2=6              O=2x3=6

The equation that represents a single replacement reaction given the various options is 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) (option 2)

A single replacement reaction, also known as single displacement reaction is a reaction in which elements higher in the electro-chemical series displace or replace elements lower in the electro-chemical series displace from a solution.

The following example illustrates single replacement reaction:

A + BC -> AC + B

From the above reaction, we can see that A has replace/displace B to from AC.

With the above information, we can determine the equation that represents single replacement reaction. Details below:

Equation from the questions:

From the above, we can see that only 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) conform to single replacement reaction.

Thus, the correct answer to the question is: 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) (option 2)

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In the reaction, H₂PO₄⁻(aq) + H₂O (l) ⇔ HPO₄⁻(aq) + H₃O+ (aq), H₂PO₄⁻ is the conjugate acid and HPO₄² is the conjugate base.

According to a more detailed definition, a conjugate base is the base member, X-, of two compounds that transform into one another by gaining or losing a proton. The conjugate base has the ability to gain or lose a proton during a chemical reaction.

The formula for the conjugate base is the formula for the acid minus one hydrogen. The reacting base transforms into its conjugate acid. The formula of the conjugate acid is the formula of the base plus one hydrogen ion.

When an acid and base undergo a Bronsted-Lowry reaction, the original acid loses its proton and transforms into a conjugate base. The original base similarly takes on a proton and changes into a conjugate acid. There is a conjugate base for every acid and vice versa for every base.

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