Answer: B. 4
Explanation:I just took it
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:
in example 4.2, you found that a particular mixture of co and h2 could produce 407 g ch3oh. co(g) 2 h2(g) n ch3oh(l) if only 332 g of ch3oh is actually produced, what is the percent yield of the compound?
The percent yield is given by the division of the actual yield and theoretical yield. The percent yield methanol (CH₃OH) compound is calculated to be 81.57%.
What is the percent yield?The percent yield is the reaction yield that is estimated by the actual and the theoretical yield that is never greater than 100% and has been the ratio of the actual to the theoretical yield multiplied by 100.
The percent yield is given as:
Percent yield = actual yield ÷ theoretical yield × 100%
Given,
Theoretical yield = 407 gram
Actual yield = 332 grams
Substituting values as:
Percent yield = 332 ÷ 407 × 100%
= 81.57 %
Therefore, the percent yield is 81.57%.
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When mercury oxide is heated, it decomposes into mercury and oxygen. If 28. 4 g of mercury oxide decomposes, producing 2. 0 g of oxygen, what is the percent by mass of mercury in mercury oxide?.
The percent by mass of mercury in mercuric oxide is
93 %.
The molecular formula of mercuric oxide is HgO. Mercury is liquid at room temperature and readily combines with oxygen to form mercuric oxide. Mercury is represented by the symbol Hg. The mass percent is defined as the ratio of the mass of the reactant to the mass of the product into 100. When mercuric oxide undergoes decomposition, it gives mercury and oxygen. And this reaction is endothermic.
The balanced equation for the reaction of mercury oxide is,
[tex]2HgO (s)→ 2Hg (l) + O _{2}(g)[/tex]
Mass of mercury oxide = 28.4 g
Mass of the oxygen = 2 g
The percent by mass of mercury in mercury oxide is,
[tex]Mass ℅= \frac{Mass \: of \: Mercury }{Mass \: of \: Mercury \: oxide} \times 100[/tex]
[tex]= \frac{28.4 - 2}{28.4} \times 100[/tex]
= 93 %
Therefore, the percent by mass of mercury in mercury oxide is 93 %.
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if you were going to be handling harmful chemicals in a lab, what safety equipment would you use to protect your eyes and face?(1 point)
Chemical splash goggles or face shields should be worn when there is a risk of splashing hazardous materials or flying particles.
What are safety equipment would you use to protect eyes and face ?Put on this protective gear before dealing with hazardous chemicals in a lab to protect your face and eyes.
If a substance has the ability to damage a surface upon touch, it is corrosive. People who inhale the fumes from these substances run the risk of burning their eyes, skin, and internal organs.These chemical burns can be avoided by closely following the biosafety protocol that a laboratory requires the use of masks, goggles, gloves, and an apron or lab coat.The regulations for biosafety in a lab necessitate that the subject not possess the exposed skin and eyes.Learn more about Lab safety here:
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deduce the correct order of the following elements in order of decreasing atomic radius: cl, n, na and f.
Correct order of the following elements in order of decreasing atomic radius are as follow N>F>Na>Cl
Atomic radius is the distance from atoms nucleus to the outer edge of the electron cloud. atomic radius decreases across a period and increases down the group across a period effective nuclear charge increases as electron shielding remain constant. In this order nitrogen and Florine are arranged in period from left to right and also sodium and chlorine are arranged in period from left to right. we move from left to right in a period atomic radius decreases.
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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!
pls explain how u do it aswell ty
[tex]2CO + O_{2} ---- > 2CO_{2}\\2Na + 2H_{2} O---- > 2NaOH + H_{2} \\2P + 3Cl_{2} ------ > 2PCl_3} \\Pb_{3} O_{4} +HNO_{3} ------ > 2Pb(NO3)_{2} + H_{2} O + PbO_{2}[/tex]
What is a reaction equation?A reaction equation is a representation of the reaction that takes place in the reaction vessel. We know that a reaction equation is balanced when the number of atoms of each of the elements is the same on both sides of the reaction equation.
We can achieve the balancing of the reaction equations by the process of an atom count. We try to find out if we have the same number of atoms on both sides of the reaction equation by carrying out a literal counting of the atoms.
Let us now attempt to write the balanced reaction equation in each case;
[tex]2CO + O_{2} ---- > 2CO_{2}\\2Na + 2H_{2} O---- > 2NaOH + H_{2} \\2P + 3Cl_{2} ------ > 2PCl_3} \\Pb_{3} O_{4} +HNO_{3} ------ > 2Pb(NO3)_{2} + H_{2} O + PbO_{2}[/tex]
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please help me figure out how many significant figures are in there
Answer:
A) 4 and 3
Explanation:
You don't count the scientific notations in his problem sine they are only trailing zeros which they don't count as sig figs so look at the original numbers. Remember that zeros after decimal points or in-between natural numbers count with that said 2.020 has 4 sig figs and 5.00 has 3 sig figs
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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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:
waters density is ___ the cooking oil and mercury
Answer:
ANSWER :: (DENSITY OF OIL IS --0.8/CM²) .
(DENSITY OF MERCURY IS --- 13.69/CM²) .
Describe Emotions in the room after “The Vote!” during July 2, 1776 U.S History
Answer:
On July 4, 1776—the day the Declaration of Independence was approved by the Second Continental Congress—the prevailing mood was trepidation and fear.
Explanation:
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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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
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
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!
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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Identify the approximate bond angles for the following molecules h2s sf2 chcl3 cf4
The approximate bond angles for the given molecules are as follows:
The bond angle of h2s is 92.1°.
The bond angle of SF2 is 98º.
The bond angle of ChCl3 is 109.5º.
The bond angle of Cf4 is 109.5º.
In an molecule, the angle formed between orbitals which contains bonding electrons pairs around the central atom is known as bond angle.
The geometry of a molecule or a compound depends on the bond angles. It is always expressed in degrees.
For example, if a compound has an angle of 180°, it would have linear shape like in the case of CO2. It has a bong angle of 180° and its shape is linear.
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question 7 briefly explain why the two pi-bonds of an alkyne triple bond are required to be oriented perpendicular to one another.
Pi bonds, on the other hand, are ties between p-orbitals on nearby atoms. The two pi bonds in an alkyne are also perpendicular since the p-orbitals are by definition parallel to one another.
What is the name of a triple bond?Alkynes are defined as molecules with a triple bond between two carbon atoms. One bond and two bonds combine to form the triple bond.
What is the formula for alkynes?Alkynes are hydrocarbons that have triple bonds between carbon atoms. When it comes to molecules with one triple bond, their usual formula is CnH2n-2 (and no rings).
How are alkynes created?Alkynes are aliphatic hydrocarbons that are acyclic (branched or unbranched) and have one triple bond between carbon atoms, giving them the typical chemical formula CnH2n-2 [18]. Triple bonds are shorter and more powerful than double bonds, continuing the trend.learn more about alkyne here
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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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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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. 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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a mixture of 0.0333 g of hydrogen and 0.0165 mol of oxygen in a closed container is sparked to initiate a reaction. how many grams of water can form?
If a mixture of 0.0333 g of hydrogen and 0.0165 mol of oxygen in a closed container is sparked to initiate a reaction. 0.2976 grams of water will be formed.
If the hydrogen reacted has a mass of 0.0333 g. then
Molar mass = m / n
2.016 g/mol = 0.0333 g / n
n = 0.01651785714 mol [tex]H_{2}[/tex]
According to the actual reaction to make water:
[tex]2H_{2} +O_{2} = 2H_{2}O[/tex]
To produce two molecules of water ([tex]H_{2}O[/tex]), two molecules of diatomic hydrogen ([tex]H_{2}[/tex]) must be combined with one molecule of diatomic oxygen ([tex]O_{2}[/tex]) and energy will be released in the process. And to complete the process, one from the reactant side must be in equilibrium with the other or in excess.
If the number of moles of 0.0333 g of [tex]H_{2}[/tex] is 0.0165, then it only needs 0.00826 mol of [tex]O_{2}[/tex] to form 0.0165 mol of water. (oxygen is in excess)
[tex]n_{H_{2} } : n_{O_{2} } :n_{H_{2}O } =[/tex] 2 : 1 : 2
= 0.0165 : 0.00826 : 0.0165
If the water produced is 0.0165 mol, then its mass is:
Molar mass = m / n
18.01528 g/mol = m / 0.01651785714 mol
m = 0.2975738214 g
m = 0.2976 g
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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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please help meee Which is a product of the process shown?
Answer:
sugar i believe
Explanation:
True or false: One reason people needed calendars in the past was to know when it was time to plant and harvest crops.!
Answer:
True
Explanation:
the time you plant crops matters alot. especially in times before pesticides and greenhouses.
Answer: False
Explanation:
People went by what the seasons were to find out what to grow. Calendars merely helped with remembering important dates like when is Halloween, when is president's day, etc..
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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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
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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