What is the difference between the mass number and the atomic mass? Why is the
mass number a good approximation for atomic mass

Answer:

We can just use the formula for the volume of sphere which is 4/3 PI R cubed R is the radius. So if you have a balloon that's a sphere.

Explanation:

For the reaction

3 Ni2+(aq) + 2 Cr(OH)3(s) + 10 OH- (aq)  →  3 Ni(s) + 2 CrO42-(aq) + 8 H2O(l) G = +87 kJ/mol

Given:

(Ni2+(aq) + 2 e- →  Ni(s)) x 3 Ered = -0.28 V

(CrO42-(aq) + 4 H2O(l) + 3 e- →  Cr(OH)3(s) + 5 OH-(aq)) x 2

_____________________________________________________________________________________

3 Ni2+(aq) + 6 e- →  3 Ni(s)

2 CrO42-(aq) + 8 H2O(l) + 6 e- →  2 Cr(OH)3(s) + 10 OH-(aq)

Answer:

bromine

Explanation:

The atomic mass of bromine (Br) is 79.90. There are two main isotopes at 79 and 81, which average out to the 79.90amu value. The 79 has 44 neutrons and the 81 has 46 neutrons. While it won't change the average atomic mass, scientists have made bromine isotopes with masses from 68 to 97.

Answer:

a. HCl + KOH

b. HCHO₂ + LiOH

Only the first H in HCHO₂ is acidic

c. N₂H₄ + HCl

Both N atoms in N₂H₄ are basic, so the compound reacts with 2 mol of HCl.

Explanation:

Answer: This is an oxidation-reduction (redox) reaction:

3 C-II - 12 e- → 3 CII (oxidation)

4 CrVI + 12 e- → 4 CrIII (reduction)

C2H5OH is a reducing agent, K2Cr2O7 is an oxidizing agent.

Answer:

1)3M

2)0.1 moles

3)1.7m

4) number of moles of solute

Answer:

1. Because a Francium atom is deeper down the alkali metals, it is much easier to lose a valence electron.

2. A fluorine atom can easily gain a valence electron, but it could not easily lose a valence electron because it is one electron away from filling the outer shell

Explanation:

The answer is the explanation

Answer:

5.492*10^10

Explanation:

1g=1000000microgram

Answer:

Meteorologists use computer models to predict the weather. And computational power has come an extended way. Yet meteorologists still have trouble correctly predicting the weather over some days. Sometimes they don’t even comprehend right over 24 hours! Why does this happen? Their ability to predict the weather is restricted by the number of available data, the time available to research it, and therefore the complexity of weather events.

Explanation:

Expressing personal ability to predict weather is limited by the amount of data available, the amount of time available to research it, and thus the complexity of weather events.

Weather forecasting is the prediction of the weather using physics principles supplemented by a variety of statistical and empirical techniques.

The goal of weather prediction is to provide information that people and organizations can use to reduce weather-related losses.

It also improve societal benefits such as life and property protection, public health and safety, and economic prosperity and quality of life.

As much information as possible about the current weather and the state of the atmosphere is gathered.

Temperature, pressure, humidity, and wind speed observations are collected from around the world and fed into powerful supercomputers.

Three factors limit the ability to predict the weather:

Thus, weather can be predicted only as probable, not definite.

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Answer:

se hhgggggggg I no

Answer:

1) Cl

2) O

3) O

4) S

5) N

6) P

7)N

Explanation:

Answer:

it determines an element's atomic number..

The initial temperature of the water that resulted in the final temperature of the water-metal mixture is 20.7 ⁰C.

"Your question is not complete, it seems to be missing the following information;"

the specific heat capacity of the metal is 0.45 J/g⁰C.

The given parameters;

The initial temperature of the water will be calculated by applying the principle of conservation of energy;

heat gained by water = heat lost by metal

[tex]Q_{water} = Q_{metal}[/tex]

[tex]m_wc_w \Delta t_w = mc\Delta t[/tex]

where;

[tex]c_w[/tex] is the specific heat capacity of the water = 4.184 J/g⁰C.

Substitute the given values;

45 x 4.184 x (22 - t) = 8.5 x 0.45 x (85 - 22)

4142.16  - 188.28t = 240.98

188.28t  = 4142.16  - 240.98

188.28t  = 3901.18

[tex]t = \frac{3901.18}{188.28} \\\\t = 20.7 \ ^0 C[/tex]

Thus, the initial temperature of the water that resulted in the final temperature of the water-metal mixture is 20.7 ⁰C.

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The pKa of formic acid is 3.75. At pH of 5.00, b) [formate] > [formic acid].

Formic acid is a weak acid. Thus, together with its conjugate base (formate) they form a buffer system. We can calculate the pH of a buffer system using Henderson-Hasselbach's equation.

[tex]pH = pKa + log \frac{[formate]}{[formic\ acid]} \\\\5.00 = 3.75 + log \frac{[formate]}{[formic\ acid]}\\\\\frac{[formate]}{[formic\ acid]} = 17.8[/tex]

As expected, at a pH above the pKa, the concentration of formate is higher than that of the formic acid.

The pKa of formic acid is 3.75. At pH of 5.00, b) [formate] > [formic acid].

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Answer:

I think the coefficient is 4

Answer:

b and c

Explanation:

b nuclear energy and d is radiology dating if I am correct

Answer:

Ethanol is oxidised by acidified sodium dichromate in a test tube reaction, firstly to form ethanal (acetaldehyde), and with further oxidation, ethanoic acid (acetic acid)

Procedure

Place about 3 cm3 of acidified sodium dichromate solution in a boiling tube.

Use a teat pipette to add 5–7 drops of ethanol, with shaking.

Cool the mixture in the tube under a tap. Note the sweetish smell of ethanal (acetaldehyde) at first, then becoming sharper as oxidation continues and forms ethanoic acid (acetic acid).

When the reaction has subsided, the mixture can be warmed gently; the smell of ethanoic acid will become more noticeable.

The process of how we would obtain ethanal free from ethanol is described in the explanations below.

The procedure for achieving this in the laboratory is as follows;

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Answer:

carboxylic acid

zhhzhdhdjhd

At the equivalence point, the NaF completely reacts with the HCl

The correct option that gives the equivalence point when titrating NaF solution with HCl(aq), occur at a pH value is option c);

c) Below 7 because it is determined by HF (aq)

Reason:

The ionic equation of the reaction taking place in the titration is presented as follows;

Therefore, by removing the spectator ions, we get;

Therefore;

The net ionic equation is the formation of hydrofluoric acid, HF, which is a

weak acid, therefore, the pH value will be below 7 because it is determined

by HF

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Answer:

I think 10.5 or 10.55

Explanation:

Hope this helps :)

Answer:

687.974 is your answer

Explanation:

[tex]\bull\sf \Delta H=4.0\times 10^{-3}M[/tex]

[tex]\bull\sf T=0.010M[/tex]

[tex]\bull\sf \Delta S=1.0M[/tex]

[tex]\\ \bull\sf\longmapsto \Delta G=\Delta H-T\Delta S[/tex]

[tex]\\ \bull\sf\longmapsto \Delta G=0.004-0.01(1)[/tex]

[tex]\\ \bull\sf\longmapsto \Delta G=0.004-0.01[/tex]

[tex]\\ \bull\sf\longmapsto \Delta G=-0.006J[/tex]

Answer:

p stands for protons. You can identify the element by matching the atomic number with the number of protons.

The answer is Potassium in this case.

The best way to determine the concentration of AgNO3 dissolved in solution is by precipitation using a chloride.

Precipitation is one of the oldest and handy methods of chemical analysis. It involves the addition of a reagent which is known to form a precipitate with the test solution.

The precipitate is now recovered from solution, dried and weighed. Stoichiometric calculations show the amount of the test substance dissolved in the test solution.

In this case, NaCl can be used to carry out a precipitation as follows;

AgNO3(aq) + NaCl(aq) -------> AgCl(s) + NaNO3(aq)

The AgCl precipitate is recovered dried and weighed and then the amount of AgNO3 in the dissolved solution is determined.

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Answer:

1.17x1024 molecules 2) 0.13 moles

Explanation:

hope this helps

The season that is signaled by warmth and new life after a cold period is the spring season.

There are four seasons of the year; winter, spring, summer and autumn(fall). In these four seasons, the coldest season is the winter season which is characterized by extreme temperatures and snow.

Immediately after this extremely cold season comes the spring which is a warm season. In this season, plants begin to blossom again as the rains begin to fall.

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Answer:

C 1.0 x 10-14 mol/L

Explanation:

also do you do connections academy?

A volcano can be defined as an opening on the surface of a planet that allows material warmer than surroundings to escape from its interior. Therefore, option (B) is correct.

A volcano can be described as an opening in the earth's crust through which lava, volcanic ash, and gases escape from its interior. When this material escapes, then eruptions can be calmer, with gentle flows of material, or can be explosive, sending material high into the sky.

When pieces of Earth's crust slowly move away from each other, magma can rise. The magma rises to fill in space and underwater volcanoes can form.

The tectonic plates can also move toward each other when magma rises. The part of Earth's crust can be forced deep into its interior which can cause the crust to melt and rise as magma.

The magma can also rise over hot spots. Hot spots can be defined as the hot areas inside of Earth where magma heats up and becomes less dense. With each way of rising the magma can form volcanoes.

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Considering the change of units, there are 2.27×10²⁵ atoms of carbon per pound.

You know that there are 6.02x 10²³ atoms of carbon per 12 grams.

On the other hand, you must make a change of units. For that you must know that 1 gram equals 0.00220462 pounds. Then you can apply the following rule of three: if 1 gram is equal to 0.00220462 pounds, 12 grams is equal to how many pounds?

[tex]mass=\frac{12 gramsx0.00220462 pounds}{1 gram}[/tex]

mass= 0.0264555 pounds

12 grams equals 0.0264555 pounds. So if 12 grams contains 6.02x 10²³ atoms, 0.0264555 pounds contains that many moles. Then you can apply the following rule of three: if 0.0264555 pounds contains 6.02x 10²³ atoms, does 1 pound contain how many atoms?

[tex]amount of atoms=\frac{1 poundx6.02x10^{23} atoms}{0.0264555 pounds}[/tex]

amount of atoms= 2.27×10²⁵ atoms

Finally, there are 2.27×10²⁵ atoms of carbon per pound.

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