Based on the data gathered in Millikan's oil-drop experiments, the concept of atomic structure was modified. Which of the following aspects of the structure of the atom was validated by these experiments?1.mass of the atom2.mass of an electron3.charge on an electron4.charge on a proton5. mass of a proton

Aldehydes can be oxidized to form organic acids, specifically carboxylic acids, not ketones. Primary alcohols can also be oxidized to aldehydes and then further to carboxylic acids.

When discussing the oxidation of aldehydes, it's important to understand that they can be further oxidized to form organic acids, specifically carboxylic acids. This is in contrast to primary alcohols, which can be initially oxidized to aldehydes and then further to carboxylic acids if the oxidation conditions are strong enough. Therefore, aldehydes do not oxidize to form ketones, but rather to organic acids.

It's noteworthy that primary alcohols like RCH₂OH can be selectively oxidized to aldehydes using milder oxidizing agents such as PCC or DMP. In comparison, secondary alcohols are oxidized to form ketones, and tertiary alcohols do not oxidize readily. However, the oxidation of aldehydes takes them one step further, from the aldehyde stage to the carboxylic acid stage.

Answer:

The answer is B

The number of sodium atoms (Na) equals the number of carbon atoms (C)

I did the quiz, hope this helps!

Answer:

The answer is B, HNO3 solution of 0.000015 M yields a pH of 4.8.

Explanation:

The equation to find the pH of a solution is the following:

[tex]ph = - log( {h}^{ + } ) [/tex]

Since HNO3 is a strong acid, it almost 100% dissociates according to a 1:1 molar ratio, into hydrogen cations and nitrate anions, meaning the concentration of hydrogen ions is nearly the same as the concentration of the acid sollution.

[tex]ph = - log(0.000015) = 4.8239...[/tex]

We can round that up to 4.8, meaning we have our answer, 0.000015 M.

Answer: [tex]N_2[/tex]

Explanation:

Element is a pure substance which is composed of atoms of similar elements.

It can not be decomposed into simpler constituents using chemical reactions.Example: Nitrogen [tex](N_2)[/tex]

Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.

It can be decomposed into simpler constituents using chemical reactions. Example: carbon dioxide [tex](CO_2)[/tex] , water [tex](H_2O)[/tex], carbon monoxide [tex](CO)[/tex]

The chemical symbol which represents an element is N₂

An Element is defined as a pure substance which is composed of atoms of similar elements. It can not be further decomposed into simpler constituents by using chemical reactions. for Example: Nitrogen gas , N₂

On the other hand, a Compound is a pure substance which is made from the  atoms of different elements which are combined together in a fixed ratio by mass. They can be decomposed into simpler constituents by using chemical reactions. for example: carbon dioxide  , water , carbon monoxide etc.

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Answer:

The answer to your question is: 0.1 M

Explanation:

data

Volume of AgNO3 = 20.00 ml

                   1000 ml --------------  1 l

                       20 ml --------------- x              

          x = 20x 1 /1000 = 0.02

AgCl = 0.2867 g

MW of AgCl = 35.45 + 107.9 = 143.35 g

                       143.35 g -------------- 1 mol

                       0.2867 g -------------  x

  x = 0.2867 x 1 / 143.35 = 0.002 moles of AgCl

   From the balance reaction we see that the proportion of AgNO3 to AgCl is 1:1, then

           1 mol of AgNO3 -------------------- 1 mol of AgCL

                 x                   ---------------------  0.002 moles of AgCl

 x = 0.002 moles of AgNO3

   This moles of AgNO3 are in 20 ml or 0.02 liters

So, Molarity = # moles/liter

      Molarity = 0.002 moles/ 0.02 = 0.1 M

Answer:

C

Explanation:

The dependent variable is the variable that you measure and in this experiment, the amount of NaCl dissolved is what is being measured.

The correct answer is C. The amount of NaCl dissolved

Explanation:

In an experiment, you can identify the dependent variable because this is the factor tested or studied. Also, this variable is affected by the independent variable or factor manipulated by the scientists. This means, in the experiment presented, the independent variable is the temperature as this is manipulated, and therefore the dependent variable is the amount of NaCl dissolved because this depends on the independent variable and it is the main factor that is being tested.

Answer:

The answer to your question is: 303g of CO2

Explanation:

Data

mass CO2 = ?

mass C4H10 = 100 g

MW C4H10 = 58.12 g

MW CO2 = 44.01 g

Solve this problem using rules of three

Reaction

                    2 C4H10 (g) + 13 O2 (g) → 8 CO2 (g) + 10 H20 (l)

                    2(58.12)      ------------------ 8(44.01)

                    100g          -------------------    x

mass of CO2 produced = x = (100)(8)(44.01) / (2)(58.12)

                                          x = 35208 / 116.24

                                          x = 302.9 g ≈ 303 g of CO2

Answer:

The answer to your question is: hydrogen bonding

Explanation:

Hydrogen bonding is a kind of interaction dipole-dipole, that means that 2 molecules attract each other because the have partial charges.

In the picture we can see 4 molecules of water, red circles are oxygens and white circles are hydrogens. In this bonding, Oxygen due to its size, and atomic number is more electronegative than hydrogen, then in water molecule is formed a partial negative charge in oxygen and a partial positive charge in hydrogen.

Finally, because of this partial charge, one oxygen can bond to one hydrogen of another molecule.

Due to its polarity, a water molecule can form weak hydrogen bonds with other water molecules or other polar molecules. Polar molecules interact well with water, but non-polar molecules do not.

Water molecules have a polarity due to the presence of polar covalent bonds within them. This polarity refers to the presence of both a positive and negative charge within the molecule, specifically, the charges are not evenly distributed. Therefore, an oxygen atom and two hydrogen atoms form a water molecule, where the oxygen atom carries a slight negative charge and the two hydrogen atoms carry a slight positive charge, causing the molecule to have a distinct 3-dimensional structure.

These charge imbalances within a water molecule and between separate water molecules allow them to attract each other, forming a weak bond known as a hydrogen bond. Hydration bonds are formed when a weakly positive hydrogen atom already bonded with one electronegative atom in a molecule gets attracted to another electronegative atom in a different molecule. This bond is of high significance in human physiology.

Water can also attract or get attracted to other polar molecules and ions due to its polarity. However, non-polar molecules like oils and fats do not interact well with water. This is why these substances do not dissolve readily in water and are termed as hydrophobic.

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Answer:

The answer to your question is:

16.47 g of N2 and 3.52 g of H2

Explanation:

Data  

20 g of products were obtain.

Process

AW N2 = 28 g

AW H2 = 2g

MW NH3 = 17 g

                                     N2(g) + 3H2(g) ---> 2NH3(g)

                                     28g       3(2)g            2(17) g

                                                                        20 g

N2

                28 g  N2 -------------------  34 g of NH3

                 x            --------------------  20 g of NH3

x = 20(28)/34 = 16.47 g of N2

H2            6 g of H2 -------------------  34 g of NH3

                  x                                       20 g of NH3

x = 20(6)/34 = 3.52 g of H2

Total mass = 16.47 g of N2 + 3.52 g of H2 = 19.99 g ≈ 20 g

Answer : The molar mass of unknown compound is 152.38 g/mole

Explanation :

Depression in freezing point = [tex]1.9^oC[/tex]

Mass of unknown compound = 16.5 g

Mass of water = 106.0 g

Formula used :  

[tex]\Delta T_f=i\times K_f\times m\\\\\Delta T_f=i\times K_f\times\frac{\text{Mass of unknown compound}}{\text{Molar mass of unknown compound}\times \text{Mass of water in Kg}}[/tex]

where,

[tex]\Delta T_f[/tex] = depression in freezing point

i = Van't Hoff factor = 1 (for non-electrolyte)

[tex]K_f[/tex] = freezing point constant for water = [tex]1.86^oC/m[/tex]

m = molality

Now put all the given values in this formula, we get

[tex]1.9^oC=1\times (1.86^oC/m)\times \frac{16.5g\times 1000}{\text{Molar mass of unknown compound}\times 106.0g}[/tex]

[tex]\text{Molar mass of unknown compound}=152.38g/mole[/tex]

Therefore, the molar mass of unknown compound is 152.38 g/mole

Answer: The molar mass of the unknown compound is 152 g/mol.

Explanation:

Depression in freezing point is given by:

[tex]\Delta T_f=i\times K_f\times m[/tex]

[tex]\Delta T_f=T_f-^0T_f=(0-(-1.9)^0C=1.9^0C[/tex] = Depression in freezing point

i= vant hoff factor = 1 (for non electrolyte)

[tex]K_f[/tex] = freezing point constant = [tex]1.86^0C/m[/tex]

m= molality

[tex]\Delta T_f=i\times K_f\times \frac{\text{mass of solute}}{\text{molar mass of solute}\times \text{weight of solvent in kg}}[/tex]

Weight of solvent (water)= 106.0 g = 0.106 kg

Molar mass of unknown non electrolyte = M g/mol

Mass of unknown non electrolyte added = 16.5 g

[tex]1.9=1\times 1.86\times \frac{16.5g}{M g/mol\times 0.106kg}[/tex]

[tex]M=152g/mol[/tex]

Thus the molar mass of the unknown compound is 152 g/mol.

Answer:

The atomic mass of lead is: 207.216 u

Explanation:

data                 Isotopes                     mass                      percent

                             1                      203.97302                      1.4

                             2                     205.974444                    24.1

                            3                      206.97587                       22.1

                            4                      207.97663                       52.4

atomic mass = (203.97302x 0.014) + (205.974444 x 0.241) +

                        (206.97587 x 0.221) + (207.97663 x 0.524)

atomic mass = 2.856 +49.639 + 45.742 + 108.979

atomic mass = 207.216 u

The atomic mass of the lead (Pb) would be 207.2168 atomic mass units.

It is the sum of the mass of all the protons as well as the neutrons that are present inside the nucleus.

As given in the problem element lead (Pb) consists of four naturally occurring isotopes with masses of 203.97302, 205.97444, 206.97587, and 207.97663 atomic mass units. The relative abundances of these four isotopes are 1.4, 24.1, 22.1, and 52.4%,

The atomic mass of the lead = .014×203.97302 + 0.241×205.97444  +0.221× 206.97587+ 0.524×207.97663

                                              =207.2168 atomic mass unit

Thus the atomic mass of the lead (Pb) would be 207.2168 atomic mass units.

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Answer:

The answer to your question is: water, polar solvent.

Explanation:

Data

sample of CaCl2

Solid copper this option is incorrect because in order to dissolve something the solvent must be liquid and this is a solid solvent.

water, I think this option is right, because CaCl2 is ionic and water is a polar solvent, CaCl2 will dissolve in water.

a polar solvent, CaCl2 will dissolve is a polar solvent like water, this option is correct.

hexane, CaCl2 will not dissolve in hexane because hexane is a non polar solvent and CaCl2 is ionic. This option is wrong

a nonpolar solvent This option is not right, CaCl2 will only dissolve in polar solvents.

liquid mercury, This option is wrong, mercury is not a solvent.

Matthias can dissolve the calcium chloride, an ionic compound, in water, a polar solvent. Solid copper, hexane, and liquid mercury won't effectively dissolve it.

Matthias can dissolve the sample of calcium chloride, an ionic compound, in water. Water is a polar solvent and is known for its ability to dissolve a variety of compounds, especially ionic compounds. The process of dissolution occurs because water molecules can attract and surround the ions in the calcium chloride, leading to its dissolution. On the other hand, solid copper, hexane (a nonpolar solvent), and liquid mercury will not effectively dissolve the calcium chloride.

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Answer:

A D E B C F

Explanation:

Answer:

I'm still learning but I wish I knew the answer to it.

Tesla and Edison could have improved their working relationship through active listening, respectful communication, willingness to compromise, seeking mediation, and focusing on their shared ambition in the field of electricity.

Nikola Tesla and Thomas Edison, both monumental figures in the history of electricity, could have employed several strategies to reconcile their differences and foster a more productive working relationship. The following are five potential approaches:

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Answer:

The answer to your question is: c) Water reacts with group 1 metals

Explanation:

A chemical property is a property that shows a change in the original molecule.

a) Water is a polar molecule  This is a physical property of water, it doesn't change the original composition of water. This option is incorrect.

b) Water is the universal solvent.  This is also a physical property of water, when water dissolves something it continues being water, then this answer is incorrect.

c) Water reacts with group 1 metals  Most of the reactions are chemical properties in this example when water reacts with a metal there is a change. This is the right option.

d) Water has a high specific heat capacity. This option is not correct, heat capacity is not a chemical property is a physical one.

Answer:

it is C!

Explanation:

i did the quiz on usatestprep

Answer:

a) 0.4004 mL : 4 significant figures

b) 6000 g : 1 significant figure

c) 1.00030 km : 6 significant figures

d) 400. mm : 3 significant figures

Explanation:

Significant figures or digits of a number refers to the trapped zeros or the non-zero digits that have meaning and contribute to the precision of the number.

a) 0.4004 mL : 4 significant figures, zeros between the non-zero digits are the significant digits and leading zeros are not significant.

b) 6000 g : 1 significant figure, trailing zeros are not considered significant.

c) 1.00030 km : 6 significant figures, trailing zeros in a decimal number are significant.

d) 400. mm : 3 significant figures, decimal after the number indicates three significant figures.

Answer:

[tex]N=47,954,528.3 atoms\\N=4.792x10^{7}atoms[/tex]

Explanation:

First we need to match the units of both measures, let's make meters for both of them, so:

[tex]d=5.3x10^{-10} m\\1in=2.54cm=0.0254m[/tex]

Now we need to make a relation between both measures, as we know that the first distance is:

[tex]5.3x10^{-10}m/atom[/tex]

Then:

[tex]N=\frac{0.0254m}{5.3x10^{-10}m/atom} \\\\N=47,954,528.3 atoms\\N=4.792x10^{7}atoms[/tex]

Answer:

0.09 moles of Br₂

Explanation:

Bromine liquid it refers at Br₂ molecule which is liquid at room temperature.

Now to calculate the number of moles we use the following formula:

number of moles = mass (g) / molecular mass (g/mol)

For Br₂ molecule we have:

number of moles = 14.4 / 160 = 0.09 moles of Br₂

Answer:

The number of moles of bromine liquid produced is 0.09.

Explanation:

Moles = [tex]\frac{\text{Mass of compound}}{\text{Molar mass of compound}}[/tex]

Mass of bromine liquid = 14.4 g

Molecular mass of bromine liquid [tex]Br_2[/tex]= 160 g/mol

Moles of bromine liquid = [tex]\frac{14.4 g}{160 g/mol}=0.09 mol[/tex]

The number of moles of bromine liquid produced is 0.09.

Answer:

The answer to your question is letter B, 2-methylhexane.

Explanation:

Remember that for naming organic compounds first, we need to look for the largest chain of carbons.

In your example, the largest chain is horizontal and has 6 carbons.

Later, we need to circle all the branches, in your example there is only one branch located close to the left side

After that, we number the carbons of the main chain, starting in the corner with more branches, in your example we start from the first carbon on the left.

Finally, start naming the number of the carbon branch, later hte name of the branch and finally the name of the main chain.

Answer:

You have to apply the colligative property of osmotic pressure and other stuff.

The final answer is 37.2  kg/m

Explanation:

Hope you can understand, my notes. A little sloppy. Enjoy it! :)

The molar mass of the new protein, calculated using osmotic pressure measurements and applying the van't Hoff equation, is approximately 841 g/mol.

The molar mass of the new protein can be determined using osmotic pressure measurements by applying the van't Hoff equation for osmotic pressure (Π) which is given by the formula Π = (n/V)RT, where Π is the osmotic pressure, n is the number of moles of solute, V is the volume of the solution in liters, R is the ideal gas constant, and T is the temperature in Kelvin.

To find the molar mass (M), we need to rearrange the equation: M = (m/n), where m is the mass of the solute. Combining these equations gives us M = (mRT)/(VΠ).

First, convert the temperature to Kelvin by adding 273.15 to the Celsius temperature: T = 25 + 273.15 = 298.15 K. Next, convert the volume of the solution to liters: V = 50.0 mL = 0.0500 L. Finally, convert the mass of the protein to grams: m = 225 mg = 0.225 g.

Using the given osmotic pressure (Π = 4.18 mm Hg) and converting it to atm (1 mm Hg = 1 torr = 1/760 atm), we have Π = 4.18/760 atm. Now we can use the ideal gas constant in L atm/(K mol): R = 0.0821 L atm/(K mol). Substituting all the values into the equation we get:

M = (0.225 g  x0.0821 L atm/(K mol) x 298.15 K) / (0.0500 L x 4.18/760 atm)

= (0.225 x 0.0821 x 298.15) / (0.0500 x 4.18/760)

= (18.42) / (0.0219)

≈ 841 g/mol.

Therefore, the molar mass of the new protein is approximately 841 g/mol.

Scientists had used creativity in their investigations is the statement best explains why the atomic theory developed efficiently.

Answer: Option B is the correct choice for the given question.

Explanation:

The basic purpose of experimentation and research is to get conclusions as a solid base for development of theories in science which can help humanity in many other factors.

By utilizing these theories many other experiments and development can be done.  Similarly while postulating the atomic theory scientist had to experiment and research many times and had to do things creatively to get to this important theory.

Answer: b

Explanation:

edg 2020

Answer:

The answer to your question is: letter B is correct

Explanation:

Calculate the Molarity of each solution an compare it to the solubility

Solubility

MW Cd(CN)2    = 252 g

                                         252 g      ----------------  1 mol

                                           1.7 g   ------------------    x

                                        x = (1.7 x1 ) / 252

                                        x = 0.006 mol

            Molarity = 0.006 / 0.1 = 0.067

a.97.0 g of Cd(CN)2 in 5.00 mL

                                          252 g      ----------------  1 mol

                                             97 g --------------------   x

                                          x = (97 x 1) / 252

                                          x = 0.38

            Molarity = 0.38 / 0.005 =75              Saturated

b. 325.5 g of Cd(CN)2 in 20.5 L

                                          252 g      ----------------  1 mol

                                        325.5 g     ----------------    x

                                        x = (325.5 x 1) / 252

                                        x = 1.29 mol

            Molarity = 1.29 / 20.5 = 0.063          Unsaturated

c. No right answer.

d. 4.25 g of Cd(CN)2 in 250.0 mL

                                            252 g      ----------------  1 mol

                                             4.25 g     ---------------   x

                                           x = (4.25 x 1) / 252

                                           x = 0.017

               Molarity = 0.017 / 0.25 = 0.067       Saturated

e. 5.750 g of Cd(CN)2 in 330.0 mL                

                                             252 g      ----------------  1 mol

                                              5.75 g ------------------    x

                                           x = (5.75 x 1) / 252 = 0.023

              Molarity = 0.023 / 0.33 = 0.07        Saturated

Among the following options no solution is unsaturated, because every given solutions contains more solute that its saturation point. Hence, option c is correct.

An unsaturated solution is the one which contains less concentration solute in the solution. A solution is said to be saturated if the solvent dissolves maximum amount of solute at a given temperature.

For an unsaturated solution, the mass solute will be less that the saturation point. Here the solubility of solute is 1.70 g /100 ml . Thus its solubility in 250 ml will be about 4.25 g and that in 330 ml is 5.7 . Thus the solutions in d and e will be saturated.

The amount of solute in solution b is greater and that in solution a also greater. They all for,s saturated solutions.

Hence, no unsaturated solution is given.

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Final answer:

The three most critical pieces of information on a chemical container label are the chemical name, any hazard warnings, and the concentration, which provide essential identification, safety, and usage details.

Explanation:

When reading a chemical container label, three of the most important pieces of information that should be prioritized are the chemical name, any hazard warnings, and the concentration of the chemical. The chemical name is essential for identification and ensuring you are working with the correct substance. Hazard warnings, often represented by the Hazard Diamond or fire diamond, provide critical safety information about the risks associated with the chemical, including flammability, reactivity, and health risks. The concentration indicates the strength of the chemical and is necessary for proper dilution, usage, and storage.

Knowing these details is important for safety in a laboratory setting and for environmental protection, as some chemicals require specific disposal methods to prevent harm to people and the environment. It's always wise to reference the safety data sheets available for chemicals to ensure thorough understanding of safety precautions and handling instructions.

As number of gaseous moles in reactant and prodict are same that is 4

So No change will occur

Answer:

B. No change will occur.

Explanation:

Notice that the two moles of gas on the side of the reactants also reflects on the side of the products (i.e. there are also two moles of gas on the side of the products).

This translates to there won't be any change in the equilibrium if the pressure is increased.

The only important factor to take note of is that altering the pressure can only result in a significant change for equilibrium reactions between gases, when the reaction features a change in the number of moles of gas.

Answer:

The average is 63.6

Explanation:

Step 1: Calculate the total points of all tests together

The total of the 4 tests is : 83.2 points + 44.6 points + 74.4 points + 52.3 points = 254.5 points

Step 2: Calculate the average points

We have 4 tests so we divide the total number by 4

254.5 points  / 4 = 63,625 points

Step 3: take significant digits into account

Sum or difference : Add or subtract in the normal way, then round the answer to the LEAST number of places to the decimal point of any number in the problem

⇒ in this case : 83.2 + 44.6 + 74.4 + 52.3 = 254.5

Multiplication and division: the answer is reported in such a way that it reflects the reliability of the least precise operation. Your answer cannot be MORE precise than the least precise measurement.

254.5 / 4 = 63.6

Answer:

The answer is Bob

Explanation:

The science exist to kinds of measurements base units and derive units of measurement.

Base units are the ones that measure: length, mass, time, electric current, temperature, luminous intensity and amount of substance.

Derivative units of measurement are obtain when we combine the base units.

Know from your question

Bob measures length is a base unit

Jill measures density is a derivative unit, is the combination of mass and volumen

Kim measures mass is a base unit

Steve measures brightness is a base unit.

Steve, who is measuring the object's brightness, needs to derive a unit of measurement due to the nature of the aspect he is quantifying.

In this scenario, Steve, who is measuring the object's brightness, must derive a unit of measurement. Length (Bob), density (Jill), and mass (Kim) all have established units such as meters, kilograms per cubic meter, and kilograms, respectively. On the other hand, brightness does not have a fundamental unit in the International System of Units (SI). It's typically quantified in terms of lux or lumens, which are derived units that depend on other factors like the area over which the light is spread.

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Answer:

C

Explanation:

Attached is the structure of a hydronium ion.

A is not the answer since evaporation is a phase change, not a structural change.  We are looking for a structural change since we are trying to form a hydronium ion.

B is not the answer since two water molecules bonded together would not produce the attached structure. It would produce a structure with two oxygens and four hydrogens.

C is the answer since water bonding to another hydrogen produces a hydronium ion.

D is not the answer since this combination would produce water.

E is not that answer since splitting a water molecule in half would take from the structure when you are actually supposed to add to it.

Answer:

b

Explanation:

Answer:

6

Explanation:

The maximum number of electrons in the orbitals of sub-levels are given as:

   for s-sublevel we have two electrons and one orbital

        p-sublevel we have six electrons and three orbitals

        d-sublevel we have ten electrons and five orbitals

       f- sublevel we have fourteen electrons and seven orbitals

The second energy level is represented by the p-sub-level and it will accommodate 6 electrons.