The atomic number of an isotope of tellurium that has 71 neutrons is 52.
What is atomic number?The atomic number of an element is the number of protons in an atom of that element.
The number of protons in an atom can be got by subtracting the mass number of an element from the number of neutrons.
According to this question, one isotope of tellurium, tellurium-123, has 71 neutrons. The atomic number or proton number can be calculated thus;
atomic number = 123 - 71
atomic number = 52
Therefore, the atomic number of an isotope of tellurium that has 71 neutrons is 52.
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Answer:
Explanation:l do not no the answer
_____________ pollutants are produced in the air as a part of photochemical smog resulting from a chemical reaction in the presence of sunlight.
Secondary pollutants are produced in the air as a part of photochemical smog resulting from a chemical reaction in the presence of sunlight.
What are secondary pollutants?The secondary pollutants are the type of pollutants that are formed as a result of combination of two or more primary pollutants in the presence of sunlight.
Examples of secondary pollutants include the following:
The ozone gas: This is formed as a result of the combination of hydrocarbons (HC) and nitrogen oxides (NOx) in the presence of sunlight.The acid rain: This is formed as a result of when sulfur dioxide or nitrogen oxides react with water in the presence of sunlight.Photochemical smog: This is the combination of nitrogen oxides and volatile organic compounds (VOCs) under sunlight to form a brown haze above cities.Therefore, Secondary pollutants are produced in the air as a part of photochemical smog resulting from a chemical reaction in the presence of sunlight.
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Which combinations of single and double bonds are possible around a carbon atom?
Two Single and One Double Covalent Bond are possible around a carbon atom. After the hydrogen, helium, and oxygen, carbon is the fourth most prevalent element in the universe by mass and the fifteenth most abundant element in the crust of the Earth.
Carbon can be considered a common component of all known life due to its abundance, distinctive diversity of organic compounds Bond and exceptional capacity to build polymers at Earth's typical temperatures. After oxygen, it makes up around 18.5% of the total mass of the human body. The allotropic form of carbon exhibits a wide range of physical properties.
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What information does a topographical map primarily provide?
Answer:
A detailed map which shows every feature of the earth accurately including roads, airports, names of places etc is called a topographical map
Explanation:
Which 1 m solution would have the highest vapor pressure at a given temperature?
c6h12o6 kcl nac2h3o2 li2so4
The 1 m solutions of C6H1O6 have the highest vapor pressure at a given temperature.
Vapor pressure is defined as the tendency of a liquid to convert into a vapor state. The vapor pressure depends on temperature, surface area, intermolecular forces, and the number of moles of a substance.
The higher the number of moles of particles in solute, the lower the vapor pressure and vice versa.
C6H12O6 has the highest vapor pressure among the given options because it has the lowest number of moles or particles in the solute. The remaining options have more moles of particles in the solute.
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How many protons neutrons and electrons are there in a neutral atom of ^60co cobalt-60?
The protons neutrons and electrons are there in a neutral atom
In a neutral atom of ⁶⁰Co (cobalt-60), there are 27 protons, 27 electrons, and 33 neutrons.
We have to find the number of protons, neutrons, and electrons in a neutral atom of ⁶⁰Co (cobalt-60).
The number of protons = The atomic number.
The atomic number of cobalt is = 27
Therefore, the protons are 27
As protons and electrons are equal. Then, the number of electrons is 27.
The number of Neutrons = Atomic number - Number of protons.
Neutrons = 60 - 27
Or, neutrons = 33
Hence, the number of neutrons is 33, electrons are 27, and protons are 27 in a neutral (cobalt-60).
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Acids, bases, and salts belong to a large group of compounds called:__________
Answer:
electrolytes
Explanation:
Water has more structure than other liquids because of its ability to form hydrogen bonds. Because of this phenomena, water expresses a relatively high __________, which allows it to cushion and protect the body’s structures.
Water has more structure than other liquids because of its ability to form hydrogen bonds. Because of this phenomenon, water expresses a relatively high density, which allows it to cushion and protect the body’s structures.
Water is a chemical element consisting of hydrogen and oxygen and exists in gaseous, liquid, and solid states. It is one of the most abundant and important compounds. It is a tasteless, odorless liquid at room temperature and has the significant ability to dissolve many other substances.
You may be surprised to learn that most of Liverpool's drinking water comes from two beautiful lakes, Llyn Celyn and Vyrnwy, 80km south of Wales. Both lakes supply millions of gallons of water to the city each day. In humans, it functions as both a solvent and transport mechanism, dissolving essential vitamins and nutrients from food and delivering them to cells. Our bodies also use water to flush out toxins, regulate body temperature, and support metabolism.
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Complete combustion of 2.00 g of a hydrocarbon produced 6.43 g of co2 and 2.19 g of h2o. what is the empirical formula for the hydrocarbon? insert subscripts as necessary.
Empirical formula for the hydrocarbon is C₅H₂
Moles of C=6.43CO2 x 1 mol CO₂/44 g x 1 mol C/mol CO₂=0.14 moles of C
Moles of H=2.19 H₂O x 1 mol H₂O/18 g x 2 mol H/mol H₂O=0.12moles of H
Dividing both by 0.14
1 mol C=0.8571mol H
Multiplying both by 3
5 mol C
2 mol H
Empirical formula =C₅H₂
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Given what you know of the acid base chemistry of hf, what is the concentration of hf in an aqueous solution with a ph of 5.89?
Hydrofluoric acid, HF in an aqueous form having molecular weight of 20.01 have concentration of 48-50% w/w in aqueous solution/water with a pH of 5.89.
HF in an aqueous solution ionizes like the other acids. It is extremely corrosive. It dissociates in water as -
HF + H₂O ⇆ H₃O⁺ + F⁻
Hydrofluoric acid is much stronger when concentrated. If concentration increases and approach to 100%, the acidity of acid increases and the base forms a bond.
3HF ⇆ H₂F⁺ + HF₂⁻
The presence of hydrogen ion in an aqueous solution makes the HF acidic. HF is soluble with boiling point 19.5°C and melting point 0f -83.6°C
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Jimmy runs fast, but he wants to run faster. He sees a commercial for a new type of sneaker that says they can make you run faster and jump higher because of how they are made. Jimmy goes and buys the new sneakers and then times how long it takes him to run one mile in his new sneakers. The next day, he puts his old sneakers back on and times how long it takes him to run one mile in his old sneakers. In his old sneakers he ran the mile in 8 minutes and 12 seconds. In his new sneakers he ran the mile in 7 minutes and 46 seconds. what is the hypothisis
At a ph of 7.25 , the ratio of protonated glu molecules to deprotonated glutamate molecules is:_______
At a ph of 7.25 , the ratio of protonated glu molecules to deprotonated glutamate molecules is 1.100
Here at a pH of 7.25, the average Glu side chain is and protonated negatively charged so used henderson hasellbalch equation so ph=pka+log[A+]/[HA] the side chain carboxylic acid functional group of the glutamic acid molecule has a pKa of 4.1 and therefore exists almost entirely in its negatively charged deprotonated carboxylate form at pH values greater than 4.1; therefore, it is negatively charged at physiological pH ranging from 7.35 to 7.45
Glutamic side chain is 4.25
At a ph of 7.25 , the ratio of protonated glu molecules to deprotonated glutamate molecules is 1.100
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An amino acid consists of an amino group at one end and which group at the opposite end?
Answer:
Carboxylic acid group
Explanation:
Carboxylic acid and amine groups form the basis of an amino acid. One group reacts with the other group on a neighboring amino acid to form the peptide bond, with the release of a water molecule.
how many feet are in 271 miles?
1mi=5280ft
SHOW YOUR WORK
due today help please
Answer:1,430,880 feet.
Explanation: You would multiply 271*5280 because there are 5280 feet in one mile. This equals 1,430,880 feet.
Process in which co2, is released as a by-product of oxidation-reduction reactions.
Process in which co2, is released as a by-product of oxidation-reduction reactions is known as krebs cycle.
In the mitochondrial matrix, acetyl-CoA is converted to carbon dioxide by the citric acid cycle, which also involves the reduction of coenzymes to produce ATP for the electron transport chain.
The acetyl group of acetyl-CoA is oxidized to make two molecules of CO2 in a succession of eight steps, while also producing one ATP. Additionally, reduced high-energy molecules like NADH and FADH2 are created.
Each glucose molecule produces two acetyl-CoA molecules so, the Krebs cycle must be completed twice to produce the four CO2, six NADH, two FADH2, and two ATPs.
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The ancestors of modern _________ performed the oxygenic photosynthesis responsible for converting our anoxic planet to an oxygenated one.
The ancestors of modern cyanobacteria performed the oxygenic photosynthesis responsible for converting our anoxic planet to an oxygenated one.
Photosynthesis sustains life on Earth today by releasing oxygen into the atmosphere and providing energy for the food chain. The rise of oxygen-producing photosynthesis enabled the evolution of complex life forms such as animals and land plants about 2.4 billion years ago. An example of photosynthesis is how plants grow by converting sugars and energy from water, air, and sunlight into energy. (biology) The process by which plants and other photoautotrophic plants produce carbohydrates and oxygen from carbon dioxide, water, and light energy.
Photosynthesis is important for plants to produce the glucose needed to manufacture energy and cellular structures. Photosynthesis also produces the oxygen that both plants and animals need for cellular respiration to make ATP, a complex organic chemical that provides energy.
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An alloy contains 64 g of pure gold and 32 g of pure zinc. what is the percentage of zinc in the alloy?
The answer of the the percentage of zinc in the alloy is 33.33%.
Mass percent is the mass of the element or solute divided by the mass of the emulsion or solute. The result is multiplied by 100 to give a percent. The formula for the quantum of an element in a emulsion is mass percent = (mass of element in 1 operative of emulsion / mass of 1 operative of emulsion) *100.
An alloy, metallic substance comprised of two or more elements, as either a compound or a solution. For example: Brass is an alloy of two metals: copper and zinc.
According to question,
Mass of pure Gold = 64g
Mass of pure zinc = 32 g
Now,
Total weight of alloy is = 64 + 32 = 96 gram
32 g of which is zinc
So percentage (%) of zinc in the alloy is 32/96*100 = 33.33 %
Hence, the percentage of zinc in the alloy is 33.33%.
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Have you ever tried eating delicious delicacies served in your school canteen during recess time? Have you ever thought of how these foods were prepared in such a way that various ingredients were mixed to make it delicious and healthy? The combination of several components or elements produce a useful end product that can be utilized and consumed for our advantage.
Yes, I have tried eating delicious delicacies served in the school canteen during recess time.
The food that is served in the school canteen is either cooked or in raw form.For example, I ate a vegetable sandwich and a banana smoothie for lunch. Cucumber and tomato are the sandwich's ingredients. We had bread, butter, salt, cheese, and cabbage. Bananas, milk, and sugar are all components of the banana milkshake. the cucumber has vitamin C. While tomatoes also contain vitamin C, cheese has lipids, and Banana has carbohydrates and these all components are good for health.Energy is what carbs are mostly used for, but they also aid to control blood sugar levels. While proteins are the building blocks of the body, stable lipids primarily aid in the storage of energy and the communication of information to cell membranes.The combination of these components in food produces different end products like vitamins, minerals, and many other nutrients which are beneficial for a healthy body.
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What is the total kinetic energy of all particles that make up the matter called?
The average kinetic energy of the particles in a substance is measured by its temperature. It is a typical particle's kinetic energy.
The thermal energy of an object is equal to the sum of the kinetic energies of all its constituent particles.
Thermal power
The sum of all an object's atoms and molecules' energies makes up the substance's total energy. Both the potential energy resulting from the forces between molecules and the kinetic energy of the particles resulting from the motions of molecules within the substance and of atoms within molecules make up thermal energy. The sum of the kinetic and potential energies is all that constitutes mechanical energy. Simply put, this amount is the total mechanical energy (abbreviated as TME).
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what is another name for relative abudance?
Percent Composition
Mass
Weight
The another name for relative abundance is Percent Composition
So, option A is correct
The relative abundances of all the stable isotopes of an element always add up to 100% since relative abundances are typically reported as percentages. A weighted average of these numbers determines the average atomic mass of an element.
The fraction of an isotope that is present on earth is quantified as its percentage abundance. It provides the amount of that specific isotope. The fraction of an isotope species in relation to all other elements in nature is known as relative abundance.
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Question 2 of 10
An 85.0 kg man playing hockey catches a puck moving at 25.0 m/s. The man
is initially at rest. The man and the puck move together after the collision. The
puck's mass is 0.16 kg. What is the final velocity?
A. 0.05 m/s
B. 13.6 m/s
C. 4.00 m/s
D. 1.00 m/s
SUBMIT
Explanation:
Using the law of the conservation of linear momentum P:
P_i = P_fP
i
=P
f
so:
M_mV_{mi}+M_pV_{pi} = M_sV_sM
m
V
mi
+M
p
V
pi
=M
s
V
s
where M_mM
m
is the mass of the man, V_{mi}V
mi
is the initial velocity of the man, M_pM
p
is the mass of the puck, V_{pi}V
pi
is the initial velocity of the puck, M_sM
s
is the mass of the puck and the man and V_sV
s
is the velocity of both after the collition.
Replacing values, we get:
(80kg)(0m/s)+(0.17kg)(20m/s) = (80kg + 0.17kg)V_s(80kg)(0m/s)+(0.17kg)(20m/s)=(80kg+0.17kg)V
s
Finally, solving for V_sV
s
:
V_sV
s
=0.0424m/s
An isotope of cesium (cesium-137) has a half-life of 30 years. if 1.0 mg of cesium-137 disintegrates over a period of 90 years, how many mg of cesium-137 would remain?
0.125 mg of cesium-137 would remain.
What is cesium-137?For calibrating radiation-detection tools like Geiger-Mueller counters, modest amounts of cs-137 are utilized. Cs-137 is employed in higher concentrations in medical radiation therapy equipment for the treatment of cancer, in industrial gauges that monitor liquid flow through pipelines, and in other industrial equipment to gauge the thickness of materials including paper, photographic film, and metal sheets.
In nuclear reactors and during the testing of nuclear weapons, one of the consequences of nuclear fission is cs-137. Due to nuclear reactor mishaps, such as the 1986 Chernobyl power plant accident, which spread Cs-137 to numerous European nations, and nuclear weapons testing that took place in the 1950s and 1960s, small amounts of Cs-137 can be discovered in the environment.
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The formulas for ethane, ethene, and ethyne are c2h6 , c2h4 , and c2h2 , respectively. Rank these compounds by the length of the carbonâ€"carbon bond.
The descending order of carbon-carbon bond length in C₂H₆, C₂H₄, and C₂H₂ is:-
C₂H₆, C₂H₄, C₂H₂
Hydrocarbons are compounds that consist of only hydrogen and carbon.
On the basis of the presence or absence of double bonds/triple bonds, they are of three types- alkanes, alkenes, and alkynes.
Alkanes do not contain any double bonds.Alkenes contain one or more double bond(s) between the carbon atoms.Alkenes contain one or more triple bond(s) between carbon atoms.The comparison between alkanes, alkenes, and alkynes is given in the adjoining image.
We can see that the bond length in alkanes like C₂H₆ is 1.53 A which is greater than alkenes(C₂H₄) , 1.33 A which is still greater than alkynes(C₂H₂) with a value of 1.18 A.
Thus, The descending order of carbon-carbon bond length in C₂H₆, C₂H₄, and C₂H₂ is:
C₂H₆, C₂H₄, C₂H₂
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Imagine a solution containing only water, sodium, and glucose. if a voltage is applied to the solution, glucose would move
Imagine a solution containing only water, sodium, and glucose. if a voltage is applied to the solution, there would be no net movement of glucose
The given declaration is wrong. Glucose answers aren't electrolytes and consequently do now no longer behavior power. Is sodium chloride an awesome conductor of power? Simply with the aid of using dissolving or dissolving it in water, it can not behavior power as a solid.
Saline includes Na+ and Cl- ions. If ions are gifted withinside the answer, those ions can pass thru the answer and convey an electric-powered current. Pure water and sugar answers do now no longer include widespread ions. glucose molecules do now no longer smash down into ions whilst dissolved.
When glucose is introduced to water, it dissolves without difficulty however now no longer dissociates into ions. Therefore, a glucose answer isn't an electrolyte and isn't a conductor of power.
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3. Rutherford's gold foil experiment showed several new things abOut the structure of the atom. Which results support the claim that the atomn has a dense, positively charged core? Choose the two statements that apply. A. Some positive particles deflected at sharp angles. B. Some negative particles defiected at sharp angles. C. Most of the positive particles passed straight through the foil. D. Some positive particles bounced back in the direction they came from.
Answer:
D. Some positive particles bounced back in the direction they came from
Mobile water supply operations, such as water shuttles or relay pumping, must be performed:_____.
Mobile water supply operations, such as water shuttles or relay pumping, must be performed In rural areas without public water distribution systems
A distribution systems includes all of the centers and devices connecting a transmission device to the customer's device. A traditional distribution device can consist of: Substations. Distribution Feeder Circuits. Switches.
Distribution systems, additionally referred to as dispensed computing, is a device with more than one additive placed on extraordinary machines that speak and coordinate movements so that it will seem like an unmarried coherent device to the end-user.
A dispensed device is computing surrounding wherein diverse additives unfold throughout more than one computer (or different computing gadgets) on a network. These gadgets cut up the work, coordinating their efforts to finish the task extra effectively than if an unmarried tool were accountable for the task.
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Which planet will have a diameter
that is approximately ten times
larger than Mercury on a scale
model?
O Mars
O Neptune
O Jupiter
O Venus
The planet that will have a diameter that is approximately ten times larger than Mercury on a scale model is Neptune (option B).
What is a scale model?A scale model is a three-dimensional copy or representation of something in which all parts have dimensions in the same proportion to that of the original.
In the solar system, there are nine planets. These nine planets in a decreasing order of their size (diameter) are as follows:
Jupiter - 142,800 KmSaturn - 120,660 KmUranus - 51,118 KmNeptune - 49,528 KmEarth - 12,756 KmVenus - 12,104 KmMars - 6,779 KmMercury - 4,849 KmBased on the original diameters of the planets, it can be said that the planet that will have a diameter that is approximately ten times larger than Mercury on a scale model is Neptune.
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Answer:
neptune
Explanation:
Which has the greatest number of hydrogen atoms? group of answer choices 1020 hydrogen atoms 100 g of a substance that is 2% h by mass 100 g of water 20 g of hydrogen gas
20gm of hydrogen will have highest number of hydrogen atoms.
We know that 1 mole of substance contains atoms equal to Avogadro number i.e. [tex]6.022*10^{23}[/tex]
As molar mass of hydrogen is 1gm there 1 mole of hydrogen contains 1gm of hydrogen and [tex]6.022*10^{23}[/tex] hydrogen atoms
If we take 1020 hydrogen atoms then it is very less than [tex]6.022*10^{23}[/tex] hydrogen atoms.
In 100gm of substance if hydrogen is 2% by mass i.e. we have 2gm of hydrogen atom which means 2 mole of hydrogen atoms
Mass of 1 mole of water is 18gm
Thus 100 gm of water have 5.55 moles of water
In 1 mole of water we have 2 grams of hydrogen
Therefore 5.55 moles of water contains 11.11gm of water i.e. 11.11 mole of water
11.11gm of water = [tex]11.11* 6.022 * 10^{23}[/tex] atoms
In 20gm of hydrogen we have 20 mole of hydrogen
i.e. [tex]20* 6.022 * 10^{23}[/tex]
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What is the density of water at room temperature in g/ml? give just the number and not the unit.
The density of water at room temperature is 1.0 g/ml.
Density is defined as the mass per unit volume. It gives the denseness of a given substance in a specific space. Different substances have different densities.
The formula to calculate the density is:
ρ =m/v
where,
ρ is the density, m is the mass of the object and V is the volume of the object. The SI unit of density is kg/m³, but we use g/ml for our convenience.
For example, the density of water is 1000 kg/m3 but we convert it into 1.0 g/ml.
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1) how many grams are present in 29 kg?
2) how many millimeters are present in 2 meters ?
Answer:
1. there are 29,000 grams present in 29 kilograms
2. there are 2000 millimeters present in 2 meters.
check out this conversion table if you get stuck again! :)
What+is+the+molar+absorptivity+of+a+solute+that+absorbs+86%+of+a+certain+wavelength+of+light+when+the+beam+passes+through+a+1.0-cm+cell+containing+a+0.16+m+solution?
The molar absorptivity of the solute that absorbs 86% wavelength of light when the beam passes through a 1.0cm cell containing a 0.16M solution is 5.375 mol L⁻¹ cm⁻¹
According to Beer-Lambert law,
"The concentration of a solution may be determined by measuring its absorbance since there is a linear relationship between the concentration and the absorbance of the solution."
A = εbC ......(i)
Where A ⇒ Absorbance
ε ⇒ Molar absorptivity
b ⇒ Length of the light path
c ⇒ Concentration
Now, A = 86%
b = 1.0cm
C = 0.16M
From (i)
A = εbC
0.86 = ε × 1 × 0.16
0.86 = ε × 0.16
ε = [tex]\frac{0.86}{0.16}[/tex] mol L⁻¹ cm⁻¹
ε = 5.375 mol L⁻¹ cm⁻¹
Therefore, the molar absorptivity of the solute is 5.375 mol L⁻¹ cm⁻¹
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