Why isn't the atomic mass of most of the elements on the periodic table a whole number?

Answers

Answer 1
because scientists want to be as precise as they could be so they used a very accurate record of measurement for each element

Related Questions

What is the mass of a glucose solution that fills a 1.00 l intravenous bottle if the density of the glucose solution is 1.15 g/ml?

Answers

Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property The  mass of the glucose solution that fills a 1.00 l intravenous bottle is  1500g.

What is density?

Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water.

Mathematically,

Density = Mass of the glucose solution ÷volume of  intravenous bottle

Volume of the intravenous bottle =  1.00l=  1.00 l*1000=1000ml

Density of glucose solution = 1.15 g/ml

Substituting all the values in above formula, we get

Mass of the glucose solution = Density*volume of  intravenous bottle

Mass of the glucose solution =1.15 g/ml*1000ml

Mass of the glucose solution = 1500g

Therefore, the mass of the glucose solution that fills a 1.00 l intravenous bottle is  1500g.

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How is the energy level of an atom's valence electrons related to the period in the periodic table?

Answers

corresponds to the period or horizontal row on the periodic table

Lipids are made up of long hydrocarbon chains, composed of all carbon and hydrogen atoms. this characteristic makes lipids insoluble in water ("oil and water don't mix") because:

Answers

This is because their tails are hydrophobic and their heads are hydrophilic. Hydrophobic meaning dislikes being near water and hydrophilic meaning likes to be near water. Therefore, they will orientate themselves in such a manner that the heads are facing externally and all the tails are facing together protected by the hydrophilic heads. google a photo of lipid chains in water if you are still confused. I'm not sure if that is what you are asking, but I hope it helps.

What is the formula for the ionic compound formed by magnesium and iodine?

Answers

the compound that is formed is: MgI2

In the reaction of fe3o4 with carbon to form carbon dioxide and iron, the number of moles of carbon required to convert 23 g of fe3o4 to products is

Answers

From the periodic table:
mass of oxygen = 16 grams
mass of carbon = 12 grams
mass of iron = 55.84 grams
Therefore:
molar mass of Fe3O4 = 3(55.84) + 4(16) = 231.52 grams
number of moles = mass/molar mass
number of moles of Fe3O4 = 23 / 231.52 = 0.099 moles

The balanced chemical equation that describes this reaction is:
Fe3O4 + 2C --------> 2CO2 + 3Fe
From the balanced reaction above, we can note that:
one mole of Fe3O4 requires two moles of carbon to react with.
Therefore, to know the number of carbon moles required to react with 0.099 moles of Fe3O4, all you have to do is cross multiplication as follows:
number of carbon moles = (2*0.099) / 1 = 0.198 moles


0.20 moles First, create a balanced equation, which is Fe3O4 + 2C => 2CO2 + 3Fe Now calculate the molar mass of Fe3O4, first lookup the atomic weights of the elements involved. Atomic weight iron = 55.845 Atomic weight oxygen = 15.999 Molar mass = 3 * 55.845 + 4 * 15.999 = 231.531 g/mol Calculate the number of moles of Fe3O4 you have 23 g / 231.531 g/mol = 0.099338749 mol Looking at the balanced equation, you can see for each mole of Fe3O4 you have, you need 2 moles of carbon. So multiply the number of moles of Fe3O4 by 2 0.099338749 mol * 2 = 0.198677499 mol Since you only have 2 significant figures in your data, round the result to 2 figures, giving 0.20 moles

The chemical properties of an atom are primarily determined by the number of

Answers

Final answer:

The chemical properties of an atom are primarily determined by its valence electrons, which are indicated by the atomic number and organized in the periodic table to reflect similarities in properties.

Explanation:

The chemical properties of an atom are primarily determined by its electrons, specifically the number of valence electrons. These are the electrons in the outermost shell of an atom. The atomic number, denoted by the letter Z, reveals the number of protons in an atom's nucleus, and since atoms are electrically neutral, it also indicates the number of electrons. In a neutral atom, the chemical properties are influenced by the arrangement of these electrons in various energy shells, with the outermost electrons playing the most significant role in chemical reactions and bonding. The periodic table arranges elements in such a way that those with similar valence electron configurations, and hence similar chemical properties, are in the same column.

The common pathway for the oxidation of glucose and fatty acids is ________.

Answers

The citric acid cycle should be the answer.

The elements at the bottom of the table were pulled out to keep the table from becoming too long. these are called the

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The 'breakout' elements listed under the main part of the periodic table are the Lanthanides and Actinides.

The space around the nucleus of an atom where the atom's electrons are found is called the

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it's called the electron cloud or orbit

Does this difference in potential energy cause a release of energy or obsorption of energy from the atoms?

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How many moles of hydrogen atoms are in 10.3 g of methane (ch4)?

Answers

Okay, so to start you need to find the molar mass for one molecule of CH4.
C=12.0g
H4=4.00g
So, CH4 molecular mass (or one mole of CH4) is 16 grams. You can then just divide 10.3 grams by 16 grams, which gives you an answer of .644 moles of CH4. Hope this helps!

Which naturally-occurring radioactive particles are negatively charged? 1. alpha particles 2. neutrons 3. gamma radiation 4. beta particles?

Answers

Beta radiation is made of electrons and are therefore negative
Final answer:

In Physics, of the listed naturally-occurring radioactive particles, beta particles carry a negative charge.

Explanation:

In the field of Physics, there are several types of naturally-occurring radioactive particles, which include alpha particles, neutrons, gamma radiation, and beta particles. Of these, it is the beta particles that carry a negative charge. Alpha particles, on the other hand, are positively charged. Neutrons do not carry a charge. Finally, gamma radiation is actually a form of electromagnetic radiation, and thus, it also does not carry a charge.

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Catalysts increase reaction rates by lowering the activation energy of a reaction.
a. True
b. False

Answers

The answer is true, catalysts increase rates by lowering the activation energy of a reaction. Catalysts lower the reaction energy and so the reaction occurs faster. Enzymes perform the role of biological catalysts. Most metabolic pathways of the body are controlled by enzymes. Enzymes by classification are proteins. 
That is 100% correct it is A!!!!
Hoped that helped u!
:D

How many aluminum atoms are in 3.78 g of aluminum?

Answers

molar mass of aluminum = 26.982 g/mol.
1 mol of Al = 26.9≈27g = 6.02×10²³ atoms [ avogadro's number]
meaning
1 g | Al = 6.02/27 × 10²³ atoms
so 3.78g | Al = 6.02×3.78]/27 ×10²³
= 0.8428 ×10²³ atoms
= 8.428 ×10²² atoms
Final answer:

The 3.78 g of aluminum contains approximately 8.43 * 10^22 aluminum atoms.

Explanation:

To find out how many aluminum atoms are in 3.78 g of aluminum, we first need to calculate the number of moles of aluminum. We know that one mole of aluminum weighs 26.98 g (as per the atomic weight of aluminum listed in the periodic table). Hence, 3.78 g of aluminum is equivalent to 3.78 g / 26.98 g/mol = 0.140 moles. Now, to calculate the number of atoms, we use Avogadro's number, which states there are approximately 6.022*10^23 atoms in one mole. Therefore, 0.140 moles of aluminum will contain 0.140 moles * 6.022*10^23 atoms/mole = 8.43 * 10^22 atoms.

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The first ionization energy, e, of a potassium atom is 0.696 aj. what is the wavelength of light, in nm, that is just sufficient to ionize a potassium atom? values for constants can be found here.

Answers

Final answer:

The wavelength of light that is just sufficient to ionize a potassium atom is 656 nm.

Explanation:

To solve this problem, we will utilize Planck's equation along with the photoelectric effect. Planck's equation is E = hv, where E is the energy, h is Planck's constant (6.62607015 x 10^-34 Js), and v is the frequency. The photoelectric effect says that a photon's energy must be larger than the binding energy (the ionization energy) to eject an electron from an atom.  

The ionization energy of potassium is given in aj (atom Joules), but it will be more convenient to convert this into joules (J). 1 aj = 4.35974 x 10^-18 J, so the ionization energy e = 0.696 aj = 0.696 * 4.35974 x 10^-18 J = 3.03 x 10^-18 J.  

We equate this to the energy of the photon (E=hv), then rearrange to find ν = E / h = (3.03 x 10^-18 J) / (6.62607015 x 10^-34 Js) = 4.57 x 10^15 Hz.

Then, using the formula c = λv, where c is the speed of light, we isolate λ, the wavelength, to find λ = c / v = (3.00 x 10^8 m/s) / (4.57 x 10^15 Hz) = 6.56 x 10^-8 m. As the question requested the answer in nanometers (nm), we convert this to obtain the final answer: 6.56 x 10^-8 m = 656 nm.

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Products are what is created during a reaction what are the three products of cellular respiration

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The three products of cellular respiration are carbon dioxide (CO2), water (H2O), and energy (usually in the form of ATP).

        This process, known as cellular respiration, uses oxygen and glucose to produce ATP, carbon dioxide, and water. Since they are what is produced, ATP, carbon dioxide, and water are all byproducts of this process.

What three byproducts do cells produce during respiration?

      Oxygen and glucose are transformed into water and carbon dioxide during cellular respiration. By-products of the process include carbon dioxide, water, and ATP, which is turned into energy.

        ATP and H2O are the last byproducts of cellular respiration. Two pyruvate molecules, four ATPs (a net of two ATP), two NADH, and two H2O are produced during glycolysis. Therefore, glycolysis is the only process that may take place in the absence of oxygen, and only two ATP molecules may be created for each glucose molecule.

          Adenosine triphosphate (ATP), carbon dioxide, and water are the three byproducts of cellular respiration.

          The Krebs cycle, also known as the citric acid cycle, electron transport, and glycolysis are the three processes that make up cellular respiration.

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For the fourth-shell orbital shown below, what are the principal quantum number, n, and the angular momentum quantum number, l

Answers

Final answer:

The principal quantum number, n, and the angular momentum quantum number, l, determine various properties of the orbital.

Explanation:

The principal quantum number, n, determines the general range of energy and the probable distances that the electron can be from the nucleus. The angular momentum quantum number, l, determines the shape of the orbital. For a given value of l, the angular momentum projection quantum number m₁ can have specific values between -l and +l.

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Final answer:

The principal quantum number, n, determines the general range of energy and probable distances of an electron from the nucleus. The angular momentum quantum number, l, specifies the shape of the orbital and corresponds to the orbital's general shape.

Explanation:

The principal quantum number, n, determines the general range of energy and probable distances of an electron from the nucleus. The angular momentum quantum number, l, specifies the shape of the orbital and corresponds to the orbital's general shape. For the fourth-shell orbital, the principal quantum number would be 4 and the angular momentum quantum number would be 0, 1, 2, or 3.

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The total oxide ion charge in a formula unit of mno is 2–. what is the charge on each manganese ion?

Answers

 

It is given that MnO2 has a formula charge of – 2. We know that each oxygen or oxide ion has also a charge of – 2, therefore there are a total of – 4 oxide charges. So we can write:

X + (- 4) = - 2

Where X is the charge of one manganese ion, so calculating for X:

X = - 2 + 4

X = 2

 

So the charge of manganese is 2+

The charge on each manganese ion in MnO is ⁺2, balancing the ⁻2 charge of the oxide ion. This ensures that the overall charge of the compound is neutral.

To find the charge on each manganese ion in MnO, we need to consider the charges of the ions involved.

In MnO, the oxygen ion typically has a charge of ⁻2 (oxide ion). Since the total charge of the oxide ions in the formula unit of MnO is ⁻2, and the compound as a whole must be neutral, the charge on the manganese ion must balance this out.

Therefore, the manganese ion must have a charge that offsets the ⁻2 charge of the oxide ion. This means each manganese ion in MnO must have a charge of ⁺2.

In summary, the charge on each manganese ion in MnO is ⁺2.

Jamaal wants to be an all-around hustler when he grows up. he plans to engage in robbery, burglary, drug dealing, as well as pimping. the chance for jamaal to pursue this career path is readily available in the urban area in which he resides. this chance is a part of the __________.

Answers

Jamaal's chance is a part of the illegitimate opportunity structure. Opportunity structure is a type of social organization and structure. 
According social  theory the social organizations and structures shape  the behavior of the individuals.
The opportunity structure in this case is illegitimate, because it includes robbery, burglary...illegal actions. 
social matrix in which he lives. Since jobs have relocated to foreign shores, Jamaal has learned that such crimes are a lucrative way for him to get out of poverty.

Which state of matter characterized by having a definite shape and a definite volume?

Answers

Solid. Water doesn't have a definite shape. Gas doesn't have either.

Answer:

the correct answer is indeed solid

Explanation:

solids have compressed matter making them have a definite shape and volume

HELP ASAP!!
Which of the following sciences is NOT a sub-field of Earth Science?
a. Oceanography
b. Vulcanology
c. meteorology
d. Botany

Answers

I think it is Botany.

The type of compound that is most likely to contain a covalent bond is ________.

Answers

The type of substance that is most likely to contain a covalent bond is ONE THAT IS COMPOSED OF ONLY NON METALS.
Covalent bond is a type of chemical bond in which electron pairs are shared among the participating elements in order to achieve the octet form. Covalent bond is usually found among non metals.

The type of compound that is most likely to contain a covalent bond is A. one that is composed of only nonmetals.

Covalent bonds typically form between nonmetal atoms because they have similar electronegativities and tend to share electrons to achieve a full outer electron shell.Ionic bonds form between metals and nonmetals due to the transfer of electrons from the metal to the nonmetal, resulting in electrostatic attraction between oppositely charged ions.Metallic bonds occur between metal atoms where electrons are delocalized over a lattice of metal cations.

Let's review the options:

A. one that is composed of only nonmetals: Correct. Nonmetals tend to share electrons, forming covalent bonds.

B. held together by the electrostatic forces between oppositely charged ions: This describes ionic bonds, not covalent bonds.

C. one that is composed of a metal from the far left of the periodic table and a nonmetal from the far right of the periodic table: This combination typically forms ionic bonds.

D. a solid metal: Metals form metallic bonds, not covalent bonds.

E. There is no general rule to predict covalency in bonds: Incorrect. There is a general rule; covalent bonds are usually formed between nonmetal atoms.

Thus, the correct answer is A.

Complete Question:

The type of compound that is most likely to contain a covalent bond is ________.

A. one that is composed of only nonmetals

B. held together by the electrostatic forces between oppositely charged ions

C. one that is composed of a metal from the far left of the periodic table and a nonmetal from the far right of the periodic table

D. a solid metal Incorrect

E. There is no general rule to predict covalency in bonds.

A 25.00 ml sample of hcl solution requires 34.30 ml of 8.670x10^-2m naoh solution to reach the end point. calculate the molarity of the hcl solution

Answers

Final answer:

The molarity of the HCl solution is 0.1174 M.

Explanation:

To calculate the molarity of the HCl solution, we can use the equation:

M1V1 = M2V2

Using the values given in the question:

M1 = Molarity of HCl solution = unknown

V1 = Volume of HCl solution = 25.00 mL = 0.025 L

M2 = Molarity of NaOH solution = 8.670x10^-2 M

V2 = Volume of NaOH solution = 34.30 mL = 0.0343 L

Plugging in these values into the equation, we get:

M1(0.025) = (8.670x10^-2)(0.0343)

M1 = (8.670x10^-2)(0.0343) / 0.025

M1 = 0.1174 M

All atoms are neutral. explain the basis of this fact

Answers

because they have an equal number of protons ad electrons

Suppose that for the same 10.0 ml sample described in q3, the mass of the crucible with precipitate was 17.550 g, and the mass of the empty crucible (tare weight) was 17.410 g. calculate the concentration of the ba(oh)2 solution from these data.

Answers

The weight of the precipitate was 17.550g - 17.410g = 0.140g. From a 10ml sample, this means the concentration was 0.140g / 10ml, which is equal to 0.014g/ml.

Final answer:

To find the concentration of the Ba(OH)2 solution, you subtract the mass of the empty crucible from the mass with the precipitate to get the mass of the precipitate. However, without the chemical equation or the formula of the precipitate, further calculations cannot be completed.

Explanation:

To calculate the concentration of the Ba(OH)2 solution from the mass of the precipitate obtained, we need to follow a series of steps. First, determine the mass of the precipitate by subtracting the mass of the empty crucible from the mass of the crucible with precipitate.

The given masses are 17.550 g (crucible with precipitate) and 17.410 g (empty crucible), so the mass of the precipitate is 17.550 g - 17.410 g = 0.140 g.

What is the density of hydrogen sulfide (h2s)?

Answers

1.36kg/m cubic is the density of h2s

Which element listed below would have chemical properties similar to fluorine?

Answers

Based on this information, I checked out the periodic table and their are many options but I would choose Chlorine or Bromine. They're also in the same group on the periodic table.

Answer:

D

Explanation:

Bromine

What color element symbol designates elements that are a gas at a given temperature??

Answers

These elements are red. They are typically gaseous at normal temperatures: some examples can include oxygen, hydrogen, and the noble gases (neon, argon, krypton). These elements all use the concept of STP (standard temperature and pressure) as their baseline: 1 atmosphere of pressure and 0 degrees Celsius.
The answer is red. The color red element symbol, designates or categorizes elements, which are known to be a gas at a given or designated temperature. One of the elements that is categorized to be in the red element in the Helium.

In which direction on the periodic table, horizontal or vertical, are elements with similar chemical properties aligned? what are families of elements with similar chemical properties called?

Answers

Elements with similar properties are aligned vertically. The family is called groups.



Elements in the periodic table  that has similar chemical properties are been arranged in vertical direction , and families of these elements are regarded as group.

The vertical aliment of the elements in the periodic table are this elements that posses similar properties.Elements in the same group do have similar chemical properties, for instance Sodium and potassium belongs to alkali metals, they are from s-block.   They posses chemical properties like high reactivity, they are ready in loosing their outmost electron so they can form cations along with charge, they always appear as silvery substance

The numbering of the Groups is  from 1 to 18. If we move from left to right, we have group 1 and 2 which are elements in the s- block,   then there are ten groups moving from 3 through 12 in the transition block(d- block) then six groups if we move through 13 and 18 in main block.

Hence, families of these elements are regarded as group.

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Organisms do not adapt as a result of competition for resources. Please select the best answer from the choices provided T F

Answers

Organisms do not adapt as a result of competition for resources. Please select the best answer from the choices provided T OR F its FALSE

In an ecosystem organisms adapt as a  result of competition for resources.Hence the given statement is false.

What is an ecosystem?

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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