The element Rhenium is an inner transition element having 75 electrons, 75 protons and 111 neutrons.
What is rhenium?The element rhenium is one of the elements that belongs to the inner transition series. The element is known to have total 75 electrons, 75 protons and 111 neutrons. The relative atomic mass of the element have been placed at 186 g/mol.
The element is known to be massive and does form very massive complexes. The complexes of rhenium are very useful in industry. The models of the atom have helped to show the arrangement of the electrons, protons and neutrons in the element.
The protons are positively charged and they are found in the nucleus while the electrons are found shells and are negatively charged. The neutrons in the atom have no charge.
The four fundamental forces are metallic forces that holds atoms of metals together. The ionic bond that holds ions together, the covalent bond that holds atoms together in molecules and the dative bonds that leads to the formation of coordinate compounds.
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Based on what you know now, do you think the channel on Mars was formed by flowing water or flowing lava?
In my opinion, the channel on Mars was formed by flowing lava because the presence of water is not possible in the intense environment of Mars.
How the channel on Mars was formed?A channel on Mars wasn't done by liquid water but it was built by molten lava according to the study of surface features on Mars. We know that water quantity is very low on the planet Mars so there is very little chance of making of these channels due to flowing of water but we can say that the channels are produced by flowing of lave because there are large number of mountain regions on Mars which erupts lava when the Mars was formed. So there is a strong evidence for the formation of channels on the Mars due to flowing lave.
So we can conclude that In my opinion, the channel on Mars was formed by flowing lava because the presence of water is not possible in the intense environment of Mars.
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A kid walking around with a balloon on a summer day when the temperature outside is 300 k contains the volume of 4 l goes into a walk in freezer with a temperature of 275 k to get an ice cream What will be the new volume to the balloon
Answer:
3.67 L
Explanation:
From the question given above, the following data were obtained:
Initial temperature (T1) = 300 K
Initial volume (V1) = 4 L
Final temperature (T2) = 275 K
Final volume (V2) =?
Thus, we can obtain the final volume (i.e the new volume) of the balloon by using the Charles law equation as shown below:
V1 /T1 = V2 /T2
4/300 = V2/275
Cross multiply
300 × V2 = 4 × 275
300 × V2 = 1100
Divide both side by 300
V2 = 1100 / 300
V2 = 3.67 L
Therefore, the new volume of the balloon is 3.67 L
Isra is analyzing the properties of several samples of elements to find out which sample is a metalloid. Which set of properties most likely belongs only to a metalloid?
Answer:
Low luster, can conduct electricity
has a high luster and is very brittle
Explain how fossil fuels are formed from living organisms on land and in the sea.
Answer:
Depending on the ambient conditions, oil or natural gas develops. Today’s sources of fossil fuels are between 15 and 600 million years old. During this period the continental plates shifted, transforming oceans into landmasses, with the result that mineral deposits can be found both on land and at sea.
Explanation:
Which of the following best describes a metallic bond?
Answer:the attraction between positive metal ions and interlocking electrons
Explanation: because I got it right
The reactions involved in producing larger compounds from smaller compounds is called.
The reactions involved in producing larger compounds from smaller compounds is called anabolism.
It is a biochemical process in which simple compounds join to form larger and complex compounds. This is why it is considered a building-up aspect of metabolism.
Anabolism does not initialize on its own because it is non-spontaneous. It requires energy in initializing. Anabolism is vital for the cell as its development, growth, and maintenance depend on it. Cells also use the anabolic process to make and repair tissues.
For example, the Formation of disaccharides and water by combining sugars, and the reaction of glycerol with fatty acids to form lipids.
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What will increase the turgor pressure in a plant
Answer:
Cell expansion and an increase in turgor pressure is due to inward diffusion of water into the cell, and turgor pressure increases due to the increasing volume of vacuolar sap. A growing root cell's turgor pressure can be up to 0.6 MPa, which is over three times that of a car tire.
Explanation...read that and you will have a sucess
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A weekly forecast is shown below. What type of front can be predicted to arrive on Sunday?
A.) Warm Front
B.) Stationary front
C.) Cold front
D.) Occluded front
Answer:
cold front
Explanation:
Fill in the coefficients, help, please.
Calculate the mass of olive oil in a 750mL bottle if the density of olive oil is 0.92 g/mL. *Use the GRASP method.
The mass of olive oil : 690 g
Further explanationDensity is a quantity derived from the mass and volume
Density is the ratio of mass per unit volume
Density formula:
[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]
ρ = density
m = mass
v = volume
Given
volume of olive oil = V=750 ml
density of olive oil = ρ = 0.92 g/ml
Required
the mass of olive oil
Analysis
the formula :
[tex]\tt m=\rho\times V[/tex]
Solution
[tex]\tt m=0.92\times 750\\\\m=690~g[/tex]
Paraphrase
the mass of olive oil : 690 g
Which image shows a foliated metamorphic rock?
light colored rock with fine grains and metallic luster.
Smooth green rock.
dark color rock with coarse grains in parallel layers.
Answer:
C
Explanation:
The answer is in the image.
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Walk in faith and trust in God!
the pH of a solution of a is increased from 2 to 3 then the concentration of h + ions will become
Answer:
The H+ concentration would decrease by 10 fold. From .01 to .001
Explanation:
This is due to how a pH of 2 is expressed in scientific notation as 10^-2 power when referring to H+ concentration so a pH of 3 would be 10^-3. Hence it would be 10 times smaller in concentration as the power increases to the negative power the smaller the concentration becomes.
a sample of gas collected in the upper atmosphere of 0.75 atm is compressed into a 150.0 mL container at the same temperature. To what volume would the original sample have had to be compressed to exert a pressure of 10.0atm
I am trying to find out what v1 is
p1= 0.75
p2=10.0 atm
v2=150.0mL
v1=?
Answer:
Say Sofa and king ten times in a row fast
Explanation:
The relative atomic mass of an element is the mass of its atoms with that which element?Give the name?
The relative atomic mass of an element is the mass of its atoms with Carbon element.
What is Atomic mass?The atomic mass of an element is defined as the average mass of the element.
Atomic mass is also defined as the mass of nucleus or it is the sum of atomic number and number of neutrons present in the atom of an element.
What is relative mass number?Relative atomic mass is defined as the atomic mass compared to One-twelvth the mass of the one atom of carbon. Since, it is seen that it is comparison of atomic mass with 1/12 the mass of an atom of carbon therefore it is indicated as relative atomic mass.
Thus, we concluded that the relative atomic mass of an element is the 1/12 the mass of its atoms with Carbon element.
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Which of the following describes our modern model of the atom? (1 pt)
*
1 point
solid sphere like a marble but unique to the element it makes
numerous positive charges floating around in a sea of negative charge (plum pudding)
positive nucleus surrounded by a blob of negative charge
positive nucleus surrounded by electrons in circular orbits
positive nucleus surrounded by electron orbitals with complex 3-D shapes and assigned energies.
Modern model of the atom states that an atom is made up of a core nucleus around which protons, neutrons, and electrons are in highly probable orbits.
What is an atom?The fundamental unit of chemistry is the atom. It is the smallest particle that can be separated into matter without releasing electrically charged particles.
Additionally, it is the smallest piece of matter with the characteristics of a chemical element.
Thus, Modern model of the atom states that an atom is made up of a core nucleus around which protons, neutrons, and electrons are in highly probable orbits.
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Temperature definition
Answer:
degree of hotness or coldness measured on a definite scale. the degree of heat that is natural to the body of a living being. abnormally high body heat running a temperature.
Explanation:
Answer:
degree of hotness or coldness measured on a definite scale.
Explanation:
A solid precipitate is formed from the reaction of lead nitrate and sodium chromate.
Lead chromate (PbCrO4) is the solid precipitate formed from the reaction of lead nitrate and sodium chromate.
A precipitate is a compound that comes out of a liquid solution and it insoluble. The chemical substance which causes the formation of solid to form is called the precipitant. Lead chromate (PbCrO4) is as hard as a brick.
The chemical equation of the reaction is:
Pb (NO3)2 + NA2CrO4 → Pb (CrO4) + 2Na (NO3)
This reaction is known as Double Displacement or Metathesis. Lead chromate emerges as a solid precipitate with a yellow color.
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What are the numbers on the right side of an element?
Answer:
It's the atomic weight for that particular element, atomic weight is just the number of protons in the element
Explanation:
okay have a good day!
1. What is given off by a nucleus undergoing each of the following types of decay? (draw each of the
particles as an isotopic (nuclear) symbol)
A. Alpha
B. Beta
C. Gamma
The following is given out by the particles undergoing these types of decay;
A. Alpha - Helium nucleus 4/2He
B. Beta - An electron 0/-1 e
C. Gamma - A gamma ray 0/0 γ
What is a radioactive decay?We know that the term radioactivity is the term that we often use to describe the spontaneous disintegration of the atoms of a substance which often leads to the formation of a new substances an the release of energy. The process by which the radioactive atoms are broken down is what we call the process of radioactive decay.
Now we know that radioactive decay is a very important process and was developed largely due to the research of the scientist that is called Maria Curie.
The following is given out by the particles undergoing these types of decay;
A. Alpha - Helium nucleus 4/2He
B. Beta - An electron 0/-1 e
C. Gamma - A gamma ray 0/0 γ
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Dilution of a buffer solution with a small amount of water will ________ the ph of the solution.
I think the answer would be
Dilution of a buffer solution with a small amount of water will not change the ph of the solution.
Hope this helps
There will be no change in the pH of buffer solution because the pH of a buffer will be constant always. And it makes the solution in a certain pH.
What is buffer?A buffer solution is the solution with constant pH used t maintain the pH of a solution in a certain value. There are both basic and acidic buffers. Basic buffer is made by mixing a weak base with its salt and it maintains the basic pH.
An acidic buffer is made by mixing a weak acid with its salt and used to maintain the acidic pH. Buffer solution will not change in pH on addition of water or acid or any base.
On each dilution the buffer will make the added concentration of acid and base in equal. Like if we added water the release H+ ion will be consumed by the basic buffer and maintain the pH.
Hence, upon dilution by water, the pH of buffer solution does not change.
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5.(03.01 LC)
Which two particles are present in the nucleus of an atom? (5 points)
Electrons and neutrons
Electrons and molecules
Protons and neutrons
Protons and electrons
6. (03.01 LC)
Thank you!
Answer:
Protons and neutrons
Explanation:
In the nucleus of an atom only the protons and neutrons are present. The extra-nuclear space is filled with electrons which are negatively charged.
Protons are the positively charged particles within an atomNeutrons do not carry any charges. Electrons are negatively chargedOnly two of the subatomic particles are found in the nucleus of an atom. The particles are protons and neutrons.
Answer:
Protons and Neutrons
Explanation:
a cylinder of o2(g) used in breathing by emphysema patients has a volume of 7.00 l at a pressure of 16.0 atm. if the temperature of the cylinder is 32.8°c, what mass (in g) of oxygen is in the cylinder?
Mass of oxygen in cylinder is 142.2 g
The equation of state for a hypothetical ideal gas is known as the ideal gas law, sometimes known as the generic gas equation. It is a good estimate of how many gases behave under various circumstances.PV = nRTGiven,
Volume: 7.00 l
Pressure: 16 atm
temperature: 32.8⁰c = 32.8+273.15 = 305.95K
Mass of oxygen in cylinder = ?
By Ideal gas law,
PV = nRT
PV = (mass/molar mass) RT
molar mass: 32g/mol
R = 0.0826
so,
16 × 7 = (mass/32) × 0.0826 × 305.95
Mass = 142.2g
therefore oxygen present inside the cylinder is 142.2 g in mass.
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Write down the reaction you think will occur after you immerse the egg in the vinegar. Come back in an hour, and record
your observations.
When immerse the egg in the vinegar then we see 'bubbles on the shell'
Here given data is when we immerse the egg in the vinegar then soak this egg shell in vinegar and in that chemical reaction will start because in vinegar acetic acid are seen and that dissolve calcium carbonate shell and the acetic acid reacts with the calcium carbonate in the egg shell and releases carbon dioxide gas that you see as bubbles on the shell after an hour we will back then egg shell are soaked by vinegar
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If the mass of an object stays the same, but its volume increases, the density of the object will
A: decrease
B: increase
C: stay the same
D: get heavier
Answer:b
Explanation: Edge 22
boosting electrocatalytic oxygen evolution by synergistically coupling layered double hydroxide with mxene
Mxene as electro catalyst also have shown productive outcomes and stable performances due to their prominent electrical conductivity and hydrophilic surface.
Mxene are a class of two dimensional inorganic compound called mxene. because of its origin from the process of etching and exfoliating. automatically thin layers of aluminum from layered carbides. oxygen evolution reaction (OER) is cornerstone reaction of many renewable energy technologies. Cost-effective yet efficient electro catalysts are critical to overcome the high overpotential and sluggish kinetics of this process new type of non-precious metal electro catalyst for OER by synergistically coupling layered double hydroxides (LDH) with two-dimensional (2D) mxene with high conductivity and active surface.
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please help meee Which is a product of the process shown?
Answer:
sugar i believe
Explanation:
How many moles 30.56g of Ca(OH)
Answer:
0.412 moles
Explanation:
No of moles =given mass /molar mass
30.56/74=0.412 moles
Note these are the number of moles of
Ca(OH)2 not Ca(OH)
how can i identify an element by the number of protons?
The number of proton is the atomic number of an element. Every element has a unique atomic number.
Answer:
the number of proton is equal
why do you think neutrons are necessary in the nucleus of an atom?
Answer:
They help stablize the strucure of an atom.
Explanation:
Take into consider isotopes where there are more or less than the ideal amount of neurtrons. These isotopes are radioactive and unstable to the point hey are used as atomic bombs. So with the proper amount of nuetrons it helps the atom maintain structure and not degrade
Answer: they have an important role to keep the atom stable
Explanation:
since protons are positively charged, there is an incredibly strong repulsive force between all the protons in a nucleus
. which type of bond exemplifies a weak chemical bond? covalent bonds in solution hydrogen bonds in solution ionic bonds in solids nonpolar covalent bonds in solids
Hydrogen bond exemplifies a weak chemical bond.
Hydrogen bond is weak because electrons are not transported to form opposing, attracting charges as they are in ionic bonds or shared as they are in covalent bonds.when hydrogen is covalently bonded to a more electronegative atom, that atom pulls the hydrogen's electron away from it, causing it to become attracted to nearby electronegative atoms with unpaired electrons. As a result, hydrogen has a slight positive charge.The electrostatic contact between the atoms caused by the gain or loss of electrons results in the formation of ionic bond which is the strongest bond. The sharing of electrons or the overlapping of two atomic orbitals results in the formation of covalent bonds.When two atoms share electrons equally, a non-polar covalent bond is created.Therefore, among all these bonds hydrogen bond is the weakest.
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