Is it balanced? How do you know?

Answer:

The mole and Avogadro’s number are two important concepts of science that provide a link between the properties of individual atoms or molecules and the properties of bulk matter. It is clear that an early theorist of the idea of these two concepts was Avogadro. However, the research literature shows that there is a controversy about the subjects of when and by whom the mole concept was first introduced into science and when and by whom Avogadro’s number was first calculated. Based on this point, the following five matters are taken into consideration in this paper. First, in order to base the subject matter on a strong ground, the historical development of understanding the particulate nature of matter is presented. Second, in 1811, Amedeo Avogadro built the theoretical foundations of the mole concept and the number 6.022 × 1023 mol−1. Third, in 1865, Johann Josef Loschmidt first estimated the number of molecules in a cubic centimetre of a gas under normal conditions as 1.83 × 1018. Fourth, in 1881, August Horstmann first introduced the concept of gram-molecular weight in the sense of today’s mole concept into chemistry and, in 1900, Wilhelm Ostwald first used the term mole instead of the term ‘gram-molecular weight’. Lastly, in 1889, Károly Than first determined the gram-molecular volume of gases under normal conditions as 22,330 cm3. Accordingly, the first value for Avogadro’s number in science history should be 4.09 × 1022 molecules/gram-molecular weight, which is calculated by multiplying Loschmidt’s 1.83 × 1018 molecules/cm3 by Than’s 22,330 cm3/gram-molecular weight. Hence, Avogadro is the originator of the ideas of the mole and the number 6.022 × 1023 mol−1, Horstmann first introduced the mole concept into science/chemistry, and Loschmidt and Than are the scientists who first calculated Avogadro’s number. However, in the science research literature, it is widely expressed that the mole concept was first introduced into chemistry by Ostwald in 1900 and that Avogadro’s number was first calculated by Jean Baptiste Perrin in 1908. As a result, in this study, it is particularly emphasised that Horstmann first introduced the mole concept into science/chemistry and the first value of Avogadro’s number in the history of science was 4.09 × 1022 molecules/gram-molecular weight and Loschmidt and Than together first calculated this number.

#CARRY ON LEARNING HOPE IT HELPS

#PLEAS GIVE ME A BRAINLIEST ANSWER FOR

MY APRICIATING WORK

Answer: 2.04

Explanation:

Answer:

Approximately [tex]0.821\; \rm mol[/tex].

Explanation:

Look up the relative atomic mass of [tex]\rm Ba[/tex], [tex]\rm O[/tex], and [tex]\rm H[/tex] on a modern periodic table:

Calculate the formula mass of [tex]{\rm Ba(OH)_2}[/tex]:

[tex]\begin{aligned}& M({\rm Ba(OH)_2}) \\ &= 137.327 + 2\times(15.999 + 1.008) \\ &\approx 171.334\; \rm g \cdot mol^{-1}\end{aligned}[/tex].

Calculate the number of moles of [tex]{\rm Ba(OH)_2}[/tex] formula units in that [tex]235\; \rm g[/tex] of this compound:

[tex]\begin{aligned}& n({\rm Ba(OH)_2}) \\ &= \frac{m({\rm Ba(OH)_2})}{M({\rm Ba(OH)_2})} \\ &= \frac{235\; \rm g}{171.334\; \rm g \cdot mol^{-1}} \approx 1.37159\; \rm mol \end{aligned}[/tex].

Calculate the volume of a [tex]c({\rm Ba(OH)_2}) = 1.67\; \rm mol \cdot L^{-1}[/tex] with approximately [tex]n({\rm Ba(OH)_2}) = 1.37159\; \rm mol[/tex] of the solute:

[tex]\begin{aligned}& V({\rm Ba(OH)_2}) \\ &= \frac{n({\rm Ba(OH)_2})}{c({\rm Ba(OH)_2})} \\ &= \frac{1.37159\; \rm mol}{1.67\; \rm mol \cdot L^{-1}} \approx 0.821\; \rm L \end{aligned}[/tex].

Answer:

Ordinary indicator only identifies weather a given solution is acidic or basic. Whereas an Universal indicator not only identifies the nature of the the solution, but also gives information about the pH of the solution, thus informing about the strength of the acid/base.

Answer:

A universal indicator is better than an ordinary indicator as it not only shows whether the solution is acidic or basic but also gives the pH values (approx.) by giving a wide range of colours corresponding to different pH values.

Answer:

Mass = 1.33 g

Explanation:

Given data:

Mass of argon required = ?

Volume of bulb = 0.745 L

Temperature and pressure = standard

Solution:

We will calculate the number of moles of argon first.

Formula:

PV = nRT

R = general gas constant = 0.0821 atm.L/mol.K

By putting values,

1 atm ×0.745 L = n × 0.0821 atm.L/mol.K× 273.15 K

0.745 atm. L = n × 22.43 atm.L/mol

n = 0.745 atm. L / 22.43 atm.L/mol

n = 0.0332 mol

Mass of argon:

Mass = number of moles × molar mass

Mass = 0.0332 mol × 39.95 g/mol

Mass = 1.33 g

Answer:

Explanation:

Answer:

1)no

2)yes

Explanation:

Answer:

I guess yes it seems like a trick question

Explanation:

Answer:

The Standard Model of particle physics is the theory describing three of the four known fundamental forces (the electromagnetic, weak, and strong interactions, and not including the gravitational force) in the universe, as well as classifying all known elementary particles. It was developed in stages throughout the latter half of the 20th century, through the work of many scientists around the world, with the current formulation being finalized in the mid-1970s upon experimental confirmation of the existence of quarks.

Answer:

practice physical

Explanation:

The Standard Model of particle physics is the theory describing three of the four known fundamental forces in the universe, as well as classifying all known elementary particles.

Answer:

-182

+281

116ueuehehheue

The average atomic mass : 15.86

Given

205 atoms = 16 amu⇒atom 1

15 atoms = 14 amu⇒atom 2

Required

The average atomic mass

Solution

Total atoms for element Z :

= 205 + 15

= 220 atoms

% atom 1 = 205/220 x 100% = 93.18%

% atom 2 = 15/220 x 100% = 6.82%

The average atomic mass :

= 93.18% x 16 amu + 6.82% x 14 amu

= 14.9088 + 0.9548

= 15.8636≈ 15.86( 4 sig fig)

Answer:

Chemical weathering is caused by rain water reacting with the mineral grains in rocks to form new minerals clays and soluble salts. These reactions occur particularly when the water is slightly acidic.

Explanation:

Answer:

At ambient pressure and temperature the isobaric specific heat, CP, of gaseous propane is 1.68 kJ/kg K or 0.402 Btu/lb °F = cal/g K, while the isochoric specific heat, CV, is 1.48 kJ/kg K or 0.353 Btu/lb °F = cal/g K.

Explanation:

Hope this helps

Answer:

A. Minerals

Explanation:

Anything that is abiotic in nature is something that isn't living. Fungi is alive, so are dogs and ants.

Answer: Minerals is the correct answer.

Explanation: Sunlight, air, precipitation, minerals, and soil are some examples of abiotic factors. These factors have a significant impact on the survival and reproduction of species in an ecosystem. Answer is confirmed correct on the test. I hope this helps! Thanks!

Answer: False. Mechanical waves cannot travel through a vacuum.

Explanation:Type of wave that can travel through the vacuum of space - DOES NOT require a medium. ... False: A vacuum is empty space (no matter). Sound waves must have a medium (matter) in order to travel. Sound waves are mechanical waves.

Answer:

The correct answer is - option D. photosynthesis.

Explanation:

It is shown by the study that most of the atmospheric oxygen comes from the photosynthesis by plants as oxygen is the byproduct of the photosynthesis. Photosynthesis is the process that uses light energy, carbon dioxide, and water to produce food or glucose/sugar and release oxygen as the byproduct.

Many scientists believe that oceanic phytoplankton that releases oxygen by the photosynthesis process makes 80 to 85% of the total oxygen of the atmospheric oxygen.

Answer:

D. photosynthesis.

Explanation:

Answer: In other words, mitochondria

Explanation:

Answer:

Mass = 5.56 g

Explanation:

Given data:

Mass of Cl₂ = 4.45 g

Mass of NaCl produced = ?

Solution:

Chemical equation:

2Cl₂ + 4NaOH     →   3NaCl + NaClO₂ + 2H₂O

Number of moles of Cl₂:

Number of moles = mass/molar mass

Number of moles = 4.45 g/ 71 g/mol

Number of moles = 0.063 mol

Now we will compare the moles of Cl₂ with NaCl.

                  Cl₂         :         NaCl

                    2          :          3

                 0.063      :        3/2×0.063 =0.095 mol

Mass of NaCl:

Mass = number of moles × molar mass

Mass = 0.095 mol × 58.5 g/mol

Mass = 5.56 g

Answer:

since the moisture in the bottle from the water collects smoke particles which form into clouds

Explanation:

Answer:

Percent yield = 90.8%

Explanation:

The reaction of Fe with S to produce FeS is:

Fe + S → FeS

Where the moles of Fe added in excess of S are the moles of FeS

Now, percent yield is defined as 100 times the ratio between actual yield (13.8g of FeS) and theoretical yield (15.2g FeS):

Percent yield = 13.8g / 15.2g * 100

Answer:

avery

Explanation:

Answer:

avery is more faster.

Explanation:

reese's speed = 10/5 = 2km/hr

reese's speed = 10/5 = 2km/hravery's speed = 15/5 = 3km/hr

reese's speed = 10/5 = 2km/hravery's speed = 15/5 = 3km/hrby seeing their speeds we can easily tell that avery is more faster than reese ...

Answer:

physical change

a b c

chemical change

d

Answer:

Double replacement:

Explanation:

Double replacement:

It is the reaction in which two compound exchange their ions and form new compounds.

AB + CD → AD +CB

Chemical equation:

CaCO₃ + 2HCl    →      CaCl₂ + H₂CO₃

The given chemical reaction is example of double displacement reaction. In this type of reaction cation and anion of both reactant exchange with each other. We can see carbonate ion of calcium carbonate combine with hydrogen ion of HCl and form carbonic acid while chloride ions of HCl combine with calcium ion and form calcium chloride.

All other options are incorrect because,

Single replacement:

It is the reaction in which one elements replace the other element in compound.

AB + C → AC + B

Decomposition reaction:

It is the reaction in which one reactant is break down into two or more product.

AB → A + B

Combustion reaction:

In combustion reaction substances are burned in the presence of oxygen.

Answer:

double-displacement

Explanation:

I took the test :)

Answer:

D it's a chemical change

Answer:

I believe its oxygen gas  

Explanation: The density of a gas is 1.43 g/L