How many electron rings are in the Bohr model of lodine (atomic #53)?
Answers
Answer:
5
Explanation:
In Bohr's atomic model, the number of periods in the periodic table corresponds to the number of electron rings of the respective elements. Iodine is in the 5th period and therefore has 5 electron rings.
Related Questions
The substances in the submleroscopic model shown here can best be described as a and a ...(LEVEL 1)
A=Liquid B=Gas C= solid
A=Solid B=VaporC=Gas
A=Gas B=LiquidC=Solid
Answers
Answer:
correct answer: A=Liquid B=Gas C= solid
i'm not sure what letter but ^ that's the answer <3
If I have 400 grams of Nitrogen Tribromide, how many moles do I have?
Answers
Which statement best describes SARS? SARS was an epidemic, but not a pandemic. SARS was a pandemic, but not an epidemic. SARS was both a pandemic and an epidemic. SARS was neither a pandemic nor an epidemic
Answers
Answer:
SARS was an epidemic, but not a pandemic.
Explanation:
It is correct to say SARS was an epidemic but not a pandemic.
An epidemic is an outbreak of infectious diseases which affects a group of people in a particular areasA pandemic is a global outbreak of diseases that affects the total population of people over a wider range.SARS outbreak occurred between 2002 - 2004 in China. It was localized to the People's republic and hence, an epidemic.
The recent outbreak of disease in 2020 on the other hand is a pandemic. The infectious disease had a global coverage.
Answer:
sars was an epidemic , but not an pandemic
Explanation:
starch is comprised of hundreds and perhaps thousands of which molecule?
Answers
Starch is a complex carbohydrate that is primarily made up of glucose molecules.
It is made up of many molecules that are connected together to form a long chain or polymer.
Starch is a polysaccharide, which means it is made up of many monosaccharide (simple sugar) molecules joined together.
The glucose molecules in starch are joined together by alpha-glycosidic linkages.
Starch is comprised of hundreds and perhaps thousands of glucose molecules.
The number of glucose molecules in a starch molecule can vary, but the average size of a starch molecule is around 1,000 glucose molecules.
Starch is an important food source for humans and other animals.
It is found in a variety of foods, including potatoes, rice, bread, and pasta.
When we eat foods that contain starch, our bodies break down the starch into glucose molecules that can be used for energy.
In conclusion, starch is comprised of hundreds and perhaps thousands of glucose molecules.
Starch is an important food source for humans and other animals.
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What is the molarity when 25.0 g of the compound NaClO3 is placed in 85.0 mL of solution?
Answers
Answer: Molarity when 25.0 g of the compound \(NaClO_{3}\)is placed in 85.0 mL of solution is 294.12 M.
Explanation:
Given: Mass = 25.0 g
Volume = 85.0 mL (1 mL = 0.001 L) = 0.085 L
Molarity is the number of moles of a substance divided by volume in liter.
Hence, molarity of given solution is calculated as follows.
\(Molarity = \frac{mass}{Volume (in L)}\)
Substitute the values into above formula as follows.
\(Molarity = \frac{mass}{volume (in L)}\\= \frac{25.0 g}{0.085 L}\\= 294.12 M\)
Thus, we can conclude that molarity when 25.0 g of the compound \(NaClO_{3}\)is placed in 85.0 mL of solution is 294.12 M.
The specific heat capacity of liquid water is 4.18 J/g-K. How many joules of heat are needed to raise the temperature of 5.00 g of water from 15.0 °C to 36.5 °C?
Answers
The specific heat capacity of a substance is the amount of energy required to raise the temperature of 1g of the substance by 1K.
\(\begin{gathered} q=mc\Delta T \\ q:energy\text{ }(J)=x \\ m:mass\text{ }(g)=5.00g \\ c:specific\text{ }heat\text{ }capacity\text{ }(Jg^{-1}K^{-1}) \\ \Delta T:change\text{ }in\text{ }temperature\text{ }(K) \\ \Delta T:(final\text{ }temperature-initial\text{ }temperature) \end{gathered}\)Calculating the change in temperature:
\(\Delta T:(273.15K+36.5\degree C)-(273.15K+15\degree C)=21.5K\)By substituting what we are given into the equation to solve for the unknow x we have;
\(\begin{gathered} q=5.00g\times4.18Jg^{-1}K^{-1}\times21.5K \\ q=+449.35J \end{gathered}\)Answer: Energy needed is 449.35J
Which of the following is not isoelectronic with the others?a. S2-b. Arc. Sc3+d. Ti4+e. Ga3+
Answers
Sc³⁺ is not isoelectronic with the others, as it does not have the same number of electrons in its outermost shell instead of the same amount of electrons as the other four atoms. Thus option c is correct.
Isomerism is a phenomenon in which various compounds have the same formula but different structural arrangements, leading to differences in properties like melting point, boiling point, etc.
The term isoelectronic means having the same number of electrons. Two or more species that have the same number of electrons are known as isoelectronic species.
a. S²⁻ has 18 electrons (16 from S and 2 from the -2 charge)
b. Ar has 18 electrons
c. Sc³⁺ has 17 electrons (21 from Sc and 3 from the +3 charge)
d. Ti⁴⁺ has 18 electrons (22 from Ti and 4 from the +4 charge)
e. Ga³⁺ has 18 electrons (21 from Ga and 3 from the +3 charge)
Thus, the only ion not isoelectronic with the others is S³⁺. Therefore, Option C is the correct answer.
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Calculate the wavelength of light emitted when an electron in the hydrogen atom makes a transition from an orbital with n=5 to an orbital with n=2 .
Answers
The wavelength of light emitted when an electron in the hydrogen atom makes a transition from an orbital with n=5 to an orbital with n=2 is 3.04 x 10^-6 m. This corresponds to a spectral line in the infrared region of the electromagnetic spectrum.
To calculate the wavelength of light emitted when an electron in the hydrogen atom makes a transition from an orbital with n=5 to an orbital with n=2, we can use the Rydberg formula.
The Rydberg formula relates the wavelengths of the spectral lines emitted by hydrogen atoms to the energy levels of the electrons in those atoms. It is given by:
1/λ = R(1/n1^2 - 1/n2^2)
where λ is the wavelength of the emitted light, R is the Rydberg constant (1.0974 x 10^7 m^-1), and n1 and n2 are the initial and final energy levels of the electron, respectively.
In this case, n1 = 5 and n2 = 2. Plugging these values into the formula, we get:
1/λ = 1.0974 x 10^7 (1/5^2 - 1/2^2)
1/λ = 1.0974 x 10^7 (0.03)
1/λ = 329220
λ = 3.04 x 10^-6 m
Therefore, the wavelength of light emitted when an electron in the hydrogen atom makes a transition from an orbital with n=5 to an orbital with n=2 is 3.04 x 10^-6 m. This corresponds to a spectral line in the infrared region of the electromagnetic spectrum.
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What is the charge of the nucleus ? Why ?
Answers
Answer:
A nucleus is a positive charge
Explanation:
A nucleus is made up of protons and neutrons. Protons have a positive charge and neutrons have a neutral charge.
Classify each of the following as a physical or chemical change. For any chemical change list at least one clue to support your answer. a. A copper wire is bent. b. Charcoal burn in a grill. c. Bread dough rises when yeast is added. d. Sugar dissolves in water.
Answers
Answer:
a. physical
b.chemical
c.chemical
d.physical
Explanation:
A. You can easily unbend the wire and reverse the change
D. No new products were created
THE ANSWER IS B AND C AS CHEMICAL CHANGES
Answer:thank you
Explanation:because I’m lazy
What is the mass, in grams, of 1.75 x 1020 molecules of caffeine, C8H10N4O2?
Answers
H: 10 atoms x atomic mass of hydrogen (1.01 g/mol) = 10.10 g/mol
N: 4 atoms x atomic mass of nitrogen (14.01 g/mol) = 56.04 g/mol
O: 2 atoms x atomic mass of oxygen (16.00 g/mol) = 32.00 g/mol
Adding these values together, we get:
96.08 g/mol + 10.10 g/mol + 56.04 g/mol + 32.00 g/mol = 194.22 g/mol
Therefore, the molecular mass of caffeine is approximately 194.22 g/mol.
To find the mass of 1.75 x 10^20 molecules of caffeine, we can use the following equation:
Mass = (Number of molecules) x (Molecular mass)
Mass = (1.75 x 10^20) x (194.22 g/mol)
Calculating the result:
Mass ≈ 3.40 x 10^22 g
Therefore, the mass of 1.75 x 10^20 molecules of caffeine is approximately 3.40 x 10^22 grams.
Which of these form an ionic bond
Answers
Answer:
the second 1
Explanation:
Question 6 of 10 What is the function of mitochondria? O
A. The mitochondria use sugars as fuel to produce energy.
B. The mitochondria direct the cell's activities and hold its DNA.
C. The mitochondria surround the cell and control which materials come into and out of the cell.
D. The mitochondria use sunlight to produce sugars. SUBE
Answers
Answer:
A. The mitochondria use sugars as fuel to produce energy.Explanation:
The most prominent function of mitochondria is to produce the energy currency of the cell, ATP (i.e., phosphorylation of ADP), through respiration and using sugar as fuel, and to regulate cellular metabolism .
The cultures of prehistoric humans are known mostly through the excavation of stone tools and other relatively imperishable artifacts. The early tool making traditions are often referred to as being paleolithic (literally "Old Stone Age). The Oldowan and Acheulian tool traditions of the first humans were the simplest applied research basic research Scientihe thought O philosophies technologies
Answers
The cultures of prehistoric humans are primarily known through the excavation of stone tools and other durable artifacts, such as the Oldowan and Acheulian tool traditions.
Stone tools and imperishable artifacts serve as key archaeological evidence for understanding prehistoric cultures. Through meticulous excavation and analysis, archaeologists have been able to piece together the lifestyles, technological advancements, and social behaviors of early human societies. The term "paleolithic" refers to the Old Stone Age, a time when humans relied on stone tools as their primary implements.
The Oldowan tool tradition is considered the earliest stone tool industry, dating back around 2.6 million years ago. It is characterized by simple tools, such as choppers and scrapers, which were crafted by flaking off pieces from larger stones. These tools were primarily used for basic activities like butchering and processing animal carcasses.
Later, the Acheulian tool tradition emerged around 1.76 million years ago, representing an advancement in stone tool technology. Acheulian tools, such as handaxes and cleavers, were more refined and standardized, showcasing an increased level of sophistication in tool-making techniques. These tools served a wide range of purposes, including hunting, woodworking, and shaping raw materials.
By studying the Oldowan and Acheulian tool traditions, researchers gain valuable insights into the cognitive abilities, cultural development, and technological progress of early humans. The examination of these artifacts provides evidence of their adaptability, problem-solving skills, and the gradual refinement of their tool-making techniques over time.
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Balance the following equations:C(s) +CO2(g)- CO(g)
Answers
Answer:
C(s)+CO₂(g)→2CO(g)
Explanation:
Basically you’re adding the compounds until they’re equal on both sides
8
How does the section "Many Chemical And Physical Changes Are Happening In Nature relate to section "Matter Isn't Lost In
Photosynthesis"?
(A)
(B)
(C)
(D)
It provides another example of how matter is conserved within ecosystems.
It contradicts the statements that water undergoes physical changes.
It supports the claim water is cycled all over the world.
It presents a solution to the problem of water undergoing physical changes.
Answers
The section many chemical and pysical changes are Happening In nature relate to section "matter Isn't lost In photosynthesis" by the fact that,It provides another example of how matter is conserved within ecosystems.
What is mass conservation?Similar to the law of conservation of energy, the total mass of a system is conserved. Mass can neither be created nor be destroyed. However, the mass of a system can be transferred to another system or can be converted as heat energy.
Photosynthesis is the process of synthesizing chemical energy in green plants using light energy. The reaction involves the combination of carbon dioxide and water to form glucose and oxygen gas.
In this reaction, the total mass of the reactants is exactly equal to the total mass of the products. Hence, the mass is conserved. This is the case for all balanced chemical reactions and physical changes. Hence, option A is correct.
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8. In
studies, scientists do not interfere with what is going on.
Answers
Answer:
Observational
Explanation:
This is the answer because researchers or scientist observe the effect of a diagnostic test, treatment or other intervention without trying to change anything.
Calcium Carbonate + Nitricacid-> calciumnitrate +water+ carbondioxide
Answers
Answer: CaCO3 + 2HNO3 -> Ca(NO3)2 + H2O + CO2
Explanation:
Part of ecosystem Contains energy storage molecules? (yes or no) Energy storage molecules flowing in? (yes or no) Energy storage molecules flowing out? (yes or no)
Producers
yes
no
yes
Consumers
yes
yes
yes
Decomposers
yes
yes
yes
Dead matter
yes
yes
yes
Abiotic matter
Answers
Part of ecosystem | Contains energy storage molecules? (yes or no) | Energy storage molecules flowing in? (yes or no) | Energy storage molecules flowing out? (yes or no)
Producers | Yes | No | Yes
Consumers | Yes | Yes | Yes
Decomposers | Yes | Yes | Yes
Dead matter | Yes | Yes | Yes
Abiotic matter | No | No | No
In an ecosystem, different components play different roles in terms of energy storage and flow.
Producers, such as plants, have the ability to produce energy-rich molecules through photosynthesis, storing energy in the form of carbohydrates. They do not rely on external sources of energy storage molecules, but they release energy storage molecules into the ecosystem when consumed or when they undergo decomposition.
Consumers, including herbivores, carnivores, and omnivores, obtain energy storage molecules by consuming producers or other consumers. They receive energy-rich molecules flowing into their systems through their diet and release energy storage molecules when they respire or excrete waste.
Decomposers break down organic matter, including dead plants and animals, into simpler substances and release energy storage molecules in the process. They receive energy storage molecules flowing into their systems from the breakdown of organic matter and release energy storage molecules back into the ecosystem.
Dead matter, which refers to organic material that is no longer living, contains energy storage molecules. When dead matter decomposes, the stored energy is released into the ecosystem.
Abiotic matter, which includes non-living components like minerals and gases, does not contain energy storage molecules and does not participate in the flow of energy storage molecules within the ecosystem.
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True or false binary ionic compounds are composed of metals and nonmetals typically from opposite sides of the periodic table
Answers
Answer:
True
Explanation:
In general, metals are located on the left of the periodic table. Nonmetals are on the right. This means that they are on opposite sides. So the answer is True.
What coefficient would you place in front of O2 in order to balance this chemical equation:
2C2H6 + _?_O2 → 4CO2 + 6H2O
C)8 A) 6 R) 14 B) 7
Answers
Answer:
7 O2
Explanation:
My method involves counting all the elements in the equation. There must be an equal amount of each on both sides. Because it's asking for O2 only, look for compounds that deal with O2
So...CO2 and H2O only on the product side for this chemical equation.
Count the total O there is
CO2 has 2 O in one molecule, so 4 CO2 molecule is 8 Oxygen
H2O has 1 O in one molecule, so 6 H2O molecule is 6 Oxygen.
Your total O on the product side is 14
On the reactant side, the O2 is paired because O2 likes to be stable, so one O2 molecule has 2 O. This means that 2x = 14, which is 7.
Your answer is 7
Answer:
7 O2
Explanation:
You are given the balanced equation 2C2H6(g) + 7O2(g) → 4CO2(g) + 6H2O(ℓ) You are given rules for assigning oxidation numbers in Table 9.3 on page 604 of the student textbook. Compare the oxidation numbers of the atoms of each element on both sides of the equation. ... Therefore, the reaction is a redox reaction.
Primary amines can be distinguished from secondary and tertiary amines by reacting with.
Answers
Primary amines can be distinguished from secondary and tertiary amines by reacting with nitrous acid (HNO2). The reaction with nitrous acid is known as the "Diazotization reaction" and is specific to primary amines.
This reaction allows for the conversion of primary amines into diazonium salts, which are highly unstable and can undergo further reactions to form various products.
In the diazotization reaction, primary amines react with nitrous acid to form a diazonium salt and water. The reaction proceeds as follows:
R-NH2 + HNO2 -> R-N2+X- + H2O
Secondary and tertiary amines do not undergo this reaction with nitrous acid because they lack the necessary hydrogen atom on the nitrogen atom to form the diazonium salt. Therefore, this reaction can be used as a distinguishing test to differentiate primary amines from secondary and tertiary amines.
The formation of the diazonium salt can be confirmed through various tests, such as the formation of colored precipitates or the coupling reactions with other compounds. These reactions are specific to primary amines and help in their identification and distinction from secondary and tertiary amines.
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what are the different types of teeth explain
Answers
Answer:
Incisors: These are the teeth at the front of the mouth and the most visible ones when we smile. Bicuspids: Also called premolars, the bicuspids come after the canines and are flatter than the canines and incisors. Molars: At the back of your mouth, you'll find wide, flat molars.
Explanation:
give me a heart and star txs
Which of the following is not related to metallic bond?
A. Alloy
B. Shared electrons
C. Transferred electrons
D. Sea of electrons
Answers
Answer: B. Shared electrons
Explanation: Electrons are shared in covalent bonds. The other options are all properties of metallic bonds.
A dog has a mass of 12 kg. What is its weight? Round your answer to tr
The dog weighs
NA dog has a mass of 12 kg. What is its weight? Round your answer to the nearest whole number.
The dog weighs
N.
Answers
Answer:
118
Explanation:
help does anyone know this
Answers
Give braniliness
AH = ?
Select one:
O a. Hproducts/Hreactants
O b. products-Hreactants
O c. Hreactants+H products
O d. Hreactants-Hproducts
Answers
Answer:
I think its C
Explanation:
Look at the following reaction:
2Al(s) + 3CuCl₂(aq) → 2AlCl3(aq) + 3Cu(s)
This is an example of what type of reaction?
O Single replacement
O Double replacement
ODecomposition
O Synthesis
Answers
Answer:
Single replacement
Explanation: Al is replacing Cu
I need help with this question ASAP
Answers
Answer:
True
Explanation:
Asexual reproduction does not involve sex cells or fertilization . Only one parent is required, unlike sexual reproduction which needs two parents. As a result, the offspring are genetically identical to the parent and to each other.
Which environment has lower temperatures at higher elevations?
A: Desert
B: Grassland
C: mountain
D: Swamp