When a molecule lacks polar bonds, there is no permanent charge difference between parts of the molecule, and the molecule is nonpolar.
Because the electron charge on both atoms is identical, the Cl2 molecule has no polar bonds. As a result, it is a nonpolar molecule. Hydrocarbons are nonpolar molecular substances because none of the bonds in hydrocarbon molecules, such as hexane, C6H14, are significantly polar.
The molecule is nonpolar if the arrangement is symmetrical and the arrows are of equal length. The molecule is polar if the arrows are of different lengths and do not balance each other. The molecule is polar if the arrangement is asymmetrical.
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Which value is equivalent to 660.3 °C on the Kelvin temperature scale?
349.06 K
1,220.54 K
933.45 K
387.15 K
The difference between a kelvin (K), which is a division of the kelvin scale, and a degree on the Celsius scale is where zero is. The zero point on the Kelvin scale is at absolute zero, whereas the zero point on the Celsius scale is the freezing point of water. As a result, 0oK equals -273.15oC and 0oC equals 273.15 kelvins.
Answer : C.933.45K
How come 0 C is 273 Kelvin?At 0 degrees Celsius, or 273 Kelvin, water freezes. Also, -273 degrees Celsius are the same as 0 Kelvin. Therefore, multiply the Celsius degree by 273 to convert it to Kelvin. And to convert from Kelvin to Celsius, just take 273 out.
Celsius to Kelvin conversion: Kelvin = Celsius + 273 1.5. The figure of 273 is also used instead of 273.15
Solution :
K = ° C + 273.15
K = 660.3 + 273.15
K = 933.45
Answer :660.3°C = 933.45k
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suppose you have a solution that is made by combining 25 grams of salt (the solute) with 75 grams of water (the solvent). what is the mass percent of the salt?
The mass percent of the salt is 33.33%
How does mass percent chemistry work?The percentage of a solution's mass that is made up of solutes is known as the mass percent. This percentage is measured in relation to the total mass of the solution.
The term "mass percent composition" also refers to weight percentage. It is referred to as w/w%. The formula for mass percent in a solution is the mass of an element in one mole of the compound divided by the compound's molar mass, then multiplied by 100%.
Total mass of solution = 75g
The mass percent of the salt= 25/75×100%
The mass percent of the salt= 33.33%.
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Prior to the industrial revolution, what was the previous highest level of co2 concentration in the atmosphere over the prior 400,000 years?.
Prior to the industrial revolution, the previous highest level of CO2 concentration in the atmosphere over the prior 400,000 years was 300 ppm.
Before the Industrial revolution, the carbon dioxide concentration in the atmosphere was lesser as there was not much carbon dioxide waste that was produced. The highest level of carbon dioxide recorded in the air was 300 ppm at that time.
After the industrial revolution, the concentration of carbon dioxide increased. We can see the carbon dioxide concentrations to reach as high as 1.5 trillion tons today. This is because the formation of industries has been increasing since then which produces a lot of waste carbon dioxide.
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are Index fossils useless or not useless why or why not? (25 pts)
Answer:
Useful
Explanation:
Index fossils are believed to be useful in correlating rock strata from widespread locations.▸ The collection of such fossils from different rock formations and layers enables the geologists to identify the layer of rock they were found in.
▸ They are also useful in dating and the study of geological formations which help scientists to get a clear understanding of the environment and the life forms that dwelt on the planet even hundreds of millions of years ago.
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what type of reaction is 2 C5H5 + Fe --> Fe(C5H5)2
Answer:
Combination or Synthesis
Explanation:
It is a combination because 2 reactants are combining together to form the product.
1. Aqueous lead(II) nitrate and aqueous potassium iodide are added to a dish containing water, as
shown.
aqueous lead(II) nitrate aqueous potassium iodide
yellow precipitate
A yellow precipitate forms after a few minutes.
Which process occurs before the precipitate forms?
A diffusion
B distillation
C fermentation
D filtration
When aqueous lead (II) nitrate and aqueous potassium iodide are added to a dish containing water, diffusion occurs before the formation of yellow precipitate.
Diffusion is a process involving the movement of molecules to the region of lower concentration from the region of higher concentration.
When aqueous lead (II) nitrate and aqueous potassium iodide are added to a dish containing water, the compounds would dissociate into ions. Immediately after the dissociation, the ions would start to diffuse through the molecules of water to lower concentration.
After diffusion, the yellow compound lead iodide would form from the reaction between iodide ions in potassium iodide and lead ions from lead nitrate. The yellow compound would later precipitate out of the solution.
The reaction involved between the compound result in potassium nitrate and lead iodide
Lead nitrate (aq) + Potassium iodide (aq) → Lead iodide (yellow precipitate) + Potassium nitrate
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An air bubble has a volume of 0.510 L at 19 ∘C. What is the volume, in liters, at 6 ∘C , if n and P do not change?
In this question, we have a situation where a gas is in constant pressure but changing its volume and temperature, and the best way to solve a situation like this, is through the Charles's gas law formula, which shows the relationship between volume and temperature when the pressure is constant. The formula is:
V1/T1 = V2/T2
We have:
V1 = 0.510 L
T1 = 19°C, but we need it in Kelvin, 292 K
V2 = ?
T2 = 6°C, or 279 K
Now we add these values into the formula:
0.510/292 = V2/279
0.00175 = V2/279
V2 = 0.488 Liters is the new volume
8. 00 g of ethane gas, c2h6, is burned in oxygen. What volume of carbon dioxide gas is produced at 1. 00 atm and 25. 0°c?.
By using the balanced reaction equation of ethane combustion, we can calculate that 12.8 L of carbon dioxide will be produced.
To calculate the answer to this, we need to write the balanced reaction equation:
2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O
Based on this, we can see that 2 moles of ethane produce 4 moles of carbon dioxide. Now, we need to calculate the number of moles (n) of ethane using its mass (m = 8.00 g) and its molar mass (M = 30.07 g/mol):
n = m/M
n = 8.00 g / 30.07 g/mol
n = 0.266 mol
Based on this, we can conclude that 2 * 0.266 mol = 0.532 mol of carbon dioxide was produced. Assuming that carbon dioxide acts as an ideal gas, we can use the ideal gas equation to calculate its volume:
PV = nRT ⇒ V = nRT/P
V - the volume of the gas
n - number of moles of gas (0.523 mol)
R - universal gas constant (0.08206 L*atm/K*mol)
T - temperature in Kelvins (25 °C = 298.15 K)
P - pressure (1.00 atm)
Now we plug all the known values into the equation:
V = 0.523 mol * 0.08206 L*atm/K*mol * 298.15 K / 1.00 atm
V = 12.8 L
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The following diagram of a pendulum shows the path it takes as it swings back and forth.
As the pendulum moves from point 2 to point 3, what happens to its mechanical energy?
Pendulum shows the path it takes as it swings back and forth and it is because of kinetic energy is converted into potential energy only once
Pendulum is the point mass suspended by the weightless and inextensible string fixed rigidly to support pendulum is also used in scientific instrument and it form because of gravity and in that pendulum potential energy is transformed to the kinetic energy and come back again and weight of pendulum is released and then it get active and gravity pull it back and that's why kinetic energy is converted into potential energy only once
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One molecule of silver atoms contains the same number of items found in one mole of calcium atoms. TrueFalse
When they talk about items found, they refer to molecules. According to Avogadro, one mole of any substance, regardless of its type, contains the same amount of molecules equal to 6.022x10^23.
Now they tell us about a molecule of silver and a mole of calcium. In one mole of calcium, there will be 6.023x10^23 molecules, which is different from one molecule of silver, so the answer will be false
Predict the product, write the balanced chemical reaction, including states of matter, for each set of starting materials lithium sulfide
A synthesis reaction is a reaction in which two compounds come together to form one. In this case, if the product is lithium sulfide, the reactants will be lithium and sulfur. Lithium in its natural form is solid, and sulfur also has a solid-state. Lithium sulfide is also a solid compound. The synthesis reaction will be:
[tex]Li_{(s)}+S_{(s)}\rightarrow Li_2S_{(s)}[/tex]Now, we have to balance the equation. We have two atoms of Li on the products side and 1 atom of Li on the reactants side. So, we put the coefficient 2 in Li molecules.
[tex]2Li_{(s)}+S_{(s)}\rightarrow Li_2S_{(s)}[/tex]Now, we have the balanced equation of the synthesis reaction of Lithium Sulfide
A gene or trait that appears or expresses itself over a recessive trait is called the anstwer
Explain how to determine the total number of elements in a chemical formula
To determine the total number of elements in a chemical formula is being able to recognise the elements of the chemical formula.
What is an element?An element is defined as the chemical substance that cannot further be divided by any chemical process into smaller particles.
A chemical formula is a representation for a chemical compound or molecules which contains one or more elements with the number of atoms attached as a subscript.
An example of a chemical formula is NaCl. This chemical formula contains one element of sodium (Na) and one element of chlorine (Cl).
In order to determine the total number of elements in a chemical formula, the elements should be recognised and the subscript attached to the element shows the number of atoms of the element found in that particular formula.
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1. Using PbS + 3PbO -> 3Pb + SO2a. How many moles of Pb will form from 17 moles of PbO (excess PbS)?b. How many moles of PbO are needed to make 27.4 moles of SO2 (excess PbS)c. Give 17.6 moles of PbS and 36 moles of PbO, which is the limiting reactant (show mathematical proof). It’s
Answer:
a. 25.5 moles of Pb will be formed.
b. 54.8 moles of PbO are needed.
c. PbS is the limiting reactant.
Explanation:
1st) It is necessary to write the balanced chemical reaction:
[tex]PbS+2PbO\rightarrow3Pb+SO_2[/tex]From the balanced chemical reaction we know that 1 mole of PbS reacts with 2 moles of PbO to produce three moles of Pb and 1 mole of SO2.
2nd) Using the stoichiometry of the reaction and a mathematical rule of three, we can calculate the moles of Pb that will be produced from 17 moles of PbO and excess of PbS:
[tex]\begin{gathered} 2molesPbO-3molesPb \\ 17molesPbO-x=\frac{17molesPbO*3molesPb}{2molesPbO} \\ x=25.5molesPb \end{gathered}[/tex]So, 25.5 moles of Pb will be formed.
3rd) Using the stoichiometry of the reaction and a mathematical rule of three, we can calculate the moles of PbO that are needed to make 27.4 moles of SO2 in excess of PbS:
[tex]\begin{gathered} 1molSO_2-2molPbO \\ 27.4molSO_2-x=\frac{27.4molSO_2*2molPbO}{1molSO_2} \\ x=54.8molPbO \end{gathered}[/tex]So, 54.8 moles of PbO are needed.
4th) Using the stoichiometry of the reaction we can calculate the limiting reactant:
- Calculation from 17.6 moles of PbS:
[tex]\begin{gathered} 1molPbS-2molPbO \\ 17.6molPbS-x=\frac{17.6molPbS*2molPbO}{1molPbS} \\ x=35.2molPbO \end{gathered}[/tex]From the stoichiometry of the reaction 1 mol of PbS reacts with 2 moles of PbO, so the 17.6 moles of PbS will need 35.2 moles of PbO to react properly, but we have 36g of PbO, so PbO will be the excess reactant and PbS the limiting reactant.
- Calculation from 36 moles of PbO:
We can do this calculation to confirm the previous one:
[tex]\begin{gathered} 2molPbO-1molPbS \\ 36molPbO-x=\frac{36molPbO*1molPbS}{2molPbO} \\ x=18molPbS \end{gathered}[/tex]In this case, we can see that 36 moles of PbO will need 18 moles of PbS to react properly, but we only have 17.6 moles of PbS. Here we confirm that PbS is the limiting reactant.
WHAT IS A HYDRATE? please provide a detailed scientific answer
A Hydrate is a compound containing H2O molecules. The best-known hydrates are crystalline solids that lose their fundamental structure from the removal of bound water. Some examples of hydrate are Glauber's Salt ( sodium sulfate decahydrate, Na2.SO4.10H2O), Washing soda ( sodium carbonate decahydrate, Na2CO3∙10H2O), and the double salts known as alums.
In many cases, hydrates are coordination compounds CuSO4∙5H2O is actually [Cu(H2O)4]SO4∙4H2O where four molecules of water of hydration are coordinated to copper ion. Similarly, MgSO4.7H2O is actually [Mg(H2O)6]SO4∙4H2O.
Noble gases and hydrocarbon gases form crystalline hydrates called clathrate compounds which are relatively at low temperatures and pressure.
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In photosynthesis, carbon dioxide and water are converted to glucose and oxygen. during cellular respiration glucose and oxygen are converted to carbon dioxide and water. identify the true statement about the processes of photosynthesis and cellular respiration. answer a cellular respiration only occurs in animal cells b photosynthesis only occurs in animal cells c both processes involve a chemical change d both processes involve a physical change
During cellular respiration, oxygen and glucose are converted into water and carbon dioxide. The procedure produces ATP, which is converted into energy, carbon dioxide, water, and other byproducts.
Why is it called cellular respiration?Oxygen might be either present or absent while organisms are respiring. However, the activity is essentially known as "cellular respiration" so because cell seems to "respire" by consuming molecular oxygen (as an electron acceptor) and exhaling carbon dioxide (as an end product).
What is the purpose of cellular respiration?The process by which glucose is broken down in the presence of oxygen in the mitochondria of animals (animals and plants) to release energy in the form of ATP is referred to as cellular respiration.
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when monosaccharides are bonded together a. polysaccharides are formed by combining many monosaccharides. b. oligosaccharides are formed by combining a few monosaccharides. c. all of these d. one h2o molecule is lost for each new link formed.
When monosaccharides are bonded together c) all of these are correct.
Monosaccharides can be described as sugars from which all other complex forms of sugars are formed. Monosaccharides are the simplest form of sugars the combination of which leads to the formation of disaccharides, polysaccharides and oligosaccharides.
When the monosaccharides join in order to form complex sugar molecules, a single molecule of water is lost by each new link or joining of molecules that occur.
As monosaccharides are simplest of sugars, they are more easily absorbed as compared to other types of sugars.
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If 0. 75 g of a monoprotic weak acid required 22. 50 ml of 0. 510 m naoh to titrate it, what is the molar mass of the acid?.
The molar mass of the acid is 65 g/mol.
What is the molar mass of the acid?We know that the term neutralization is applied to the reaction between an ad and a base that produces salt and water only. In this case, we have been told that a monoprotic weak acid required 22. 50 ml of 0. 510 m sodium hydroxide to titrate it.
Let us recall that by the principle of the stoichiometry of the chemical reactions, the reaction between sodium hydroxide and a monoprotic acid has to be one is to one and we have to bear this in mind.
Thus;
Number of moles of sodium hydroxide = 22. 50/1000 L * 0. 510 M
= 0.0115 moles
This implies that 0.0115 moles of the acid was required also.
Since;
Number of moles = mass/molar mass
Molar mass = mass/Number of moles
Molar mass = 0. 75 g /0.0115 moles
= 65 g/mol
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element x has two naturally occurring isotopes. if 72% of the atoms have a mass of 85 amu and 28% of the atoms have a mass of 87 amu, what is the atomic mass of element x?
The atomic mass of element x is 85.56 amu if 72% of the atoms have a mass of 85 amu and 28% of the atoms have a mass of 87 amu
The atomic mass of an element can be determined by first multiplying the percentage of its isotopes by their atomic mass and then adding the resultants together.
As 72% of the atoms have a mass of 85 amu and 28% have a mass of 87 amu, therefore
atomic mass of element x = (72% × 85) + (28% × 87)
atomic mass of element x = (72/100 × 85) + (28/100 × 87)
atomic mass of element x = (0.72 × 85) + (0.28 × 87)
atomic mass of element x = 61.2 + 24.36
atomic mass of element x = 85.56 amu
Therefore the atomic mass of element x is calculated to be 85.56 amu.
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A temperature change of 51 deg * C would be equivalent to a temperature change of
i don't know if you mean C° to F° but in F° the change would be 123.8°
Summarize the formation of a base.
Bases can be formed by the direct combination of the elements that form the bases.
What are bases?Bases are substances that react with acids to form salt and water only.
Bases are usually oxides or hydroxides of metals.
Bases have the property of turning red litmus blue.
The formation of a base will involve the direct combination of the constituent elements.
For example, the formation of the bases magnesium oxide and ammonia is shown below:
Ammonia: N₂+ 3 H₃ ---> 2 NH₃
Magnesium oxide: 2 Mg + O₂ ---> MgO
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11) In the reaction 2SO2(g) + O2(g) → 2SO3(g), how many moles of O2 are needed to produce 8.46 moles of SO3?
To solve this question, we need to look at the stoichiometric ratio between oxygen and SO₃, which in this case is 1:2
So 1 mole of O2 produces 2 moles of SO3.
Now we can use the rule of 3:
1 mole O2 --- 2 mole SO3
x mole O2 --- 8.46 moles SO3
2x = 1 x 8.46
x = 8.46/2
x = 4.23
Answer: 4.23 moles of O2
how many Ca moles are there in 6.2 g of Ca3(PO4)2 ?
According to the mole concept, there are 0.02 moles in 6.2 g of calcium phosphate.
What is mole concept?According to mole concept,mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.
It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.
It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass in grams present in one mole of atoms is its atomic mass.
In the given problem, number of moles is found out by, mass/molar mass
that is,6.2/310= 0.02 moles.
Hence, there are 0.02 moles in 6.2 g of calcium phosphate.
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Energy transfers between particles when they ______?
Energy transfers between particles when they collide.
When the particles collide they vibrate and energy get transferred between the particles. The particles that made matter are in constant motion and have high kinetic energy. kinetic energy is equal to heat. Energy is the ability to do work. When energy moves from one place to another place we can say that energy is transferred . so in case of particle s, particles are in continuous motion and colloid with each other and when the particles collide with each other the energy transfer between particles takes place.
Thus, Energy transfers between particles when they collide.
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Fatty acids that are broken down for energy production are utilized for which aspects of cellular respiration? choose all that apply.
Fatty acids that are broken down for energy productions are utilized for glycolysis.
What is glycolysis?Although the multiple choices are missing, you might be referring to these multiple choices: (a) Fermentation, (b) Glycolysis, (c) Pyruvate oxidation, (d) Citric acid cycle, (e) Electron transport chain. In that case, the correct answer is (b) Glycolysis.
Glycolysis refers to the breakdown of glucose or sugar (C₆H₁₂O₆), releasing energy and pyruvate (CH₃COCO₂H). Glycolysis is the first stage in the process of cellular respiration in organisms. Cells use glycolysis as a method to produce energy. Glycolysis is found in the great majority of organisms alive today.
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If a silver ion has 47 protons and 46 electrons, what is the overall charge on the ion?
A) 0
B) +1
C) -1
What do cocaine, amphetamines, caffeine, nicotine, and MDMA (ecstasy) all have in common?
Select one:
a.
They all increase the activity of the nervous system.
b.
They all cause hallucinations.
c.
They are all taken by people who want to relax or go to sleep.
d.
They are all very highly addictive both physically and psychologically.
Cocaine, amphetamines, caffeine, nicotine, and MDMA (ecstasy) have in common that they all increase the activity of the nervous system (Option a).
What are stimulant drugs?The expression stimulant drugs is used in biology and medicine to describe chemical substances that speed up the velocity in which messages are transmitted between nerve cells, which is common to caffeine, nicotine cocaine and ecstasy.
Therefore, with this data, we can see that stimulant drugs are able to increase the velocity in which messages are transmitted in the nervous system.
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exactly 25.0 ml of an aqueous solution of strontium hydroxide required 32.0 ml of 0.200 m nitric acid to neutralize it. what is the concentration of the strontium hydroxide solution? give only your numerical answer and do not include the m. for example, 0.262 or 1.25.
Ba(OH)2(aq) + 2HNO3(aq) ==> 2H2O(l) + Ba(NO3)2(aq) ... balanced equation
What is balanced equation?A chemical equation that is balanced has the same number of each type of atom on both sides of the equation. Subscripts are a component of the chemical formulas for the reactants and products that show how many atoms of the previous element there are in each.
note the stoichiometry ... 2 mols HNO3 for each 1 mol Ba(OH)2
Now we can use dimensional analysis and the noted stoichiometry to solve the problem:
32.0 ml HNO3 x 1 L/1000 ml x 0.200 mol / L = 0.0064 mols HNO3 used
0.0064 mol HNO3 x 1 mol Ba(OH)2 / 2 mols HNO3 = 0.0032 mol Ba(OH)2 present
Concentration of Ba(OH)2 = mols/L = 0.0032 mols / 0.0250 L = 0.128 M
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When zinc is immersed in hydrocholoric acid
Answer:
Zinc is more reactive than lead, iron and silver so, zinc reacts with hydrochloric acid to form Zn2+ ions.
Answer:
zn2+
Explanation:
the reason for this answer is that when hydrochloric acid and zinc come together they react to form a stronger ion
A volcano has recently irrupt it and wiped out most of the wildlife will leave it on the volcano how are birds in the area going to be impacted
A volcano has recently irrupt it and wiped out most of the wildlife will leave it on the volcano and it will create huge impact on birds in the area going to be impacted as the volcano irrupt heat will generate and it will cause increase in the temperature that will change the life style of the various birds living in that area.
What is volcano?Volcano is defined as a rupture in the part of the crust of the planetary mass of the object generally Earth, which allows the hot lava as well as ash, including the gases that has been escaped from the chamber of the magma.
Therefore, A volcano has recently irrupt it and wiped out most of the wildlife will leave it on the volcano and it will create huge impact on birds in the area going to be impacted as the volcano irrupt heat will generate and it will cause increase in the temperature that will change the life style of the various birds living in that area.
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