In a covalent bond, one line represents one pair of electrons being shared.
What are covalent compounds?Covalent compounds are compounds formed as a result of sharing of electrons between the atoms that make up the compound.
In other words, electrons are shared among atoms that make up covalent compounds unlike in ionic compounds where some atoms donate electrons while some atoms accept electrons.
Thus, a line in the structure of covalent compounds represents a bond formed as a result of sharing a pair of electrons between two atoms.
For example, the line between C and H in C-H represents a bond formed between the two atoms as a result of sharing a pair of electrons between them. Whereas, the line between Na and Cl atoms in Na-Cl represents a bond formed as a result of Na donating an electron to Cl.
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How does the weight of an object affect the amount of force it would need to move
Predict if a reaction would occur when solutions of 0. 1 m rbbr and 0. 1 m nacl are combined. If you predict a reaction will occur, determine the net ionic equation for the reaction.
Here no reaction will occur when a solution of 0.1 m rbbr and 0.1 m NaCl are combined and no net net ionic equation applicable.
What is net ionic equation and why there is no reaction and hence no net ionic equation applicable?Net ionic equation is the combination of equations of reactants and products and combined they are called to be net ionic equation.We know it already that when two ionic compounds solution are combined their components ions may get exchange in double displacement reaction.The reaction that would be called double displacement reaction would be written as : Rbbr + NaCl = RbCl + Nabr , but this won't occur here.Actually in the combination no precipitate is formed as both of the ionic compouneds are getting dissolved that is both are soluble.Hence there is no reaction and no net ionic equation applicable when solutions 0.1 m rbbr and 0.1 m nacl are combined.To know more about reaction visit:
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How many hydrogen atoms are in 25.5g of c2h2?
The hydrogen atoms are in 25.5g of C₂H₂ is 11.79 gm. The chemical substance known as acetylene has the formula C₂H₂ . One acetylene molecule contains two hydrogen atoms. The alkyne series' first stable component is acetylene.
What is acetylene ?The chemical compound acetylene has the formula C2H2 and the chemical formula HC ≡ CH. It is the most basic alkyne and a hydrocarbon. This colorless gas is frequently utilized as a fuel and a component of chemical compounds. Since it is unstable in its pure state, a solution is typically used.
Compressed acetylene and compressed oxygen are frequently utilized to power torches used for a variety of operations. Due to its strong flammability, instability, and particular storage and transportation needs, acetylene poses special risks. Acetylene is extremely brittle.
Thus, The hydrogen atoms are in 25.5g of C₂H₂ is 11.79 gm.
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What is the molar mass of a compound if 0.0401 moles weigh 21.6 grams ?
The molar mass of a compound of 0.0401 moles weighing 21.6 grams is 538.65 g.
The molar mass of a substance is the mass in grams of one mole of the compound. In a substance, the amount of entities present e.g. atoms, molecules, ions, is defined as a mole.
∴M = m / n
M = molar mass
m = mass of a substance (in grams) = 21.6 grams
n = number of moles of a substance = 0.0401 moles
∴ 0.0401 moles of a compound have a mass of 21.6 g
∴ 1 mole of the compound will have a mass of 21.6 / 0.0401
= 538.65 g (molar mass of compound)
So, the molar mass of a compound of 0.0401 moles weighing 21.6 grams
is 538.65 g.
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What is physical weathering?
the transformation of rocks into some other type of materials
the breaking of rock into smaller pieces from nonchemical processes
the building up of rock that has been brought from other places
the movement of rock from one place to another
Answer:
B
Explanation:
I took the test
Answer:
the breaking of rock into smaller pieces from nonchemical processes
Explanation:
Basically, the process that breaks rocks apart without changing their chemical composition.
A sample of an ideal gas at 1.00 atm and a volume of 1.98 L was placed in a weighted balloon and dropped into the ocean. As the sample descended, the water pressure compressed the balloon and reduced its volume. When the pressure had increased to 60.0 atm, what was the volume of the sample? Assume that the temperature was held constant.
The volume of the sample, assuming the temperature was held constant is 0.033 L
How do I determine the volume of the sample?From the question given above, the following data were obtained:
Initial pressure (P₁) = 1 atmInitial volume (V₁) = 1.98 LTemperature = ConstantNew pressure (P₂) = 60.0 atmNew volume (V₂) =?Since the temperature is constant, the new volume of the sample can be obtained by using the Boyle's law equation as illustrated below:
P₁V₁ = P₂V₂
1 × 1.98 = 60 × V₂
1.98 = 60 × V₂
Divide both side by 60
V₂ = 1.98 / 60
V₂ = 0.033 L
Thus, we can conclude that the new volume of the sample is 0.033 L
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The molarity (m) of a solution refers to
The molarity(m) of a solution means number of moles of solute by volume of solution in litres.
Molarity is the molar concentration of a solution measured in moles of solute per liter of solution. Solution molarity is the number of moles of solute dissolved in 1 liter of solution. To calculate the molarity of a solution, divide the moles of solute by the volume of the solution, expressed in liters.
Molarity is the amount of a substance in a given volume of solution. Molarity is defined as the number of moles of solute per liter of solution. Molarity is also called the molarity of a solution. Divide the moles of solute by the total volume of the solution in liters. The ratio of the volume occupied by a substance to the amount of substance, usually given at a specific temperature and pressure.
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identify the reaction types
1. 2H₂O₂ -> 2H₂O + O₂
2. 2CO + O₂ -> 2CO₂
3. 2KBr + Cl₂-> 2KCI + Br₂
4. 2H₂O₂ -> 2H₂O + O₂
5. 2HgO -> 2Hg + O₂
6. CaO + H₂O -> Ca(OH)₂
7. Zn + H₂SO4 -> ZnSO4 + H2
8. 2H2 + O2 -> 2H2O
9. Ca(OH)2 + H2SO4 -> CaSO4 + 2H2O
10. AgNO3 + NaCl -> AgCl + NaNO3
The reaction types are oxidation-reduction, displacement, and double displacement reaction.
1. 2H₂O₂ -> 2H₂O + O₂ ----------- reduction.
2. 2CO + O₂ -> 2CO₂ ------------ Synthesis
3. 2KBr + Cl₂-> 2KCI + Br₂ ----- Single Replacement
4. 2H₂O₂ -> 2H₂O + O₂ ---------------- reduction.
5. 2HgO -> 2Hg + O₂ ----------- Decomposition.
6. CaO + H₂O -> Ca(OH)₂ ---------- synthesis / hydration
7. Zn + H₂SO4 -> ZnSO4 + H2 ----- single displacement
8. 2H2 + O2 -> 2H2O ---------- Synthesis.
9. Ca(OH)2 + H2SO4 -> CaSO4 + 2H2O --- double displacement.
10. AgNO3 + NaCl -> AgCl + NaNO3 --- double displacement.
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Is it possible to get a homozygous dominant offspring with brown eyes if you
cross and Heterozygous Dad with brown eyes, and a Homozygous recessive
with blue eyed Mom?
Use the empty Punnett square to determine if this is possible. Explain your
answer and copy and paste your completed Punnett square into the
discussion along with your answer.
Yes, because green eye alleles are more common than blue eye alleles; therefore, a parent with blue eyes can only have two blue eye alleles.
What is a brief definition of alleles?The term "allele" is used to refer to a gene's alternate form or variants. For each autosomal gene, one allele is inherited from each parent, and we often group the alleles into categories. Usually, we refer to them as normal, wild-type, aberrant, or mutant alleles.
An allele or a gene?A gene's changeable form is called an allele. There are some genes that come in different forms yet all have the same genomic location on a chromosome. Humans are considered diploid organisms because each genetic locus in them has two alleles, one from each parent..
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How can we determine the rate of the decomposition of H2O2?
Answer:
Because the concentration of oxygen is proportional to its pressure, we can calculate the rate at which H2O2 decomposes by monitoring the rate of increase of the pressure due to the formation of oxygen. By varying the initial molar concentration of H2O2 solution, the rate law for the reaction can be determined.
Explanation:
The reaction rate depends on the disappearance of the hydrogen peroxide or on the appearance of oxygen
What is the rate of decomposition?We know that the rate of decomposition has to the rate at which the compound hydrogen peroxide can be broken down so as to obtain water and oxygen.
In this case, we can see that there are two ways that we can be able to monitor the rate of the reaction and these two ways are;
1) To observe the rate at which the hydrogen peroxide disappears
2) To observe the rate at which the oxygen gas appears.
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24) When a bulldozer moves dirt, which of the following statements best describes what's happening?
Gravitational potential energy is converted into work.
b) Electrical potential energy is converted into heat.
c) Chemical energy is converted into work.
d) Magnetic energy is converted into heat.
e) Elastic potential energy is converted into work.
When a bulldozer moves dirt elastic potential energy is converted into work. Therefore option E is correct.
What is potential energy ?Potential energy is the power that an item may store due to its position in relation to other things, internal tensions, electric charge, or other circumstances.
Rubber band potential energy, often referred to as elastic potential energy, is stored because of the rubber band's elasticity. The energy in the stretched rubber band is transformed into kinetic energy as you release it, and it transfers that energy to the surface holding the object.
One of the two types of energy is potential energy, which is the latent energy in an object at rest. Kinetic energy, on the other hand, is the energy that a moving item expresses.
Thus, option E is correct.
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Population and Water This activity will help you meet this educational goal: Content Standards—You will explain why scarcity and choice are basic economic problems faced by every society. Directions Read the instructions for this self-checked activity. Type in your response to each question, and check your answers. At the end of the activity, write a brief evaluation of your work. Activity Think about the video you watched earlier and answer these questions. Part A What was the scarce resource in the video?
Population and water are as the population increases the percentage of people without access to clean water will increase as well
Overpopulation will strain current water resources to their limits and cause an increase in water pollution and lead to an increase in civil and international conflict over existing water supplies and as the population increases the percentage of people without access to clean water will increase as well and in many urban areas water scarcity is already a reality and this leave many cities sorely unequipped for continued rapid population growth in the future
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Please SHOW WORK/steps for all problems, answers already there
1. The solution of the problem is volume = 9.14 mL.
Use this formula, P1V1/T1 = P2V2/T2
Here,
P1 = initial pressure, given = 746 mm Hg
V1 = initial volume, given = 10.1 mL
T1 = initial temperature, given = 23° C = 296 K
P2 = final pressure, given = 760 mm Hg
V2 = final volume
T2 = final temperature, given = 0° C = 273 K
Put these values in formula, P1V1/T1 = P2V2/T2
V2 = P1V1T2/P2T1
V2 = 9.14 mL
Hence,
2. The solution of the problem, put the values in formula,
P1V1/T1 = P2V2/T2
V2 = P1V1T2/P2T1
3.The solution of the problem, put the values in formula,
P1V1/T1 = P2V2/T2
V2 = P1V1T2/P2T1
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How many moles of Cl, molecules are required to react with 4.70 mol Al atoms?
The number of moles required to react with 4.70 mol Al is 7.05 mole of Cl₂.
The mole is the quantity of substance of a system that includes as many standard entities as there are atoms in zero.012 kilograms of carbon 12; its image is the mole.
The mole, symbol mol, is the SI unit of the quantity of substance. One mole carries exactly 6.022 140 76 × 1023 essential entities. This wide variety is the fixed numerical cost of the Avogadro regular, NA, whilst expressed in mol−1, and is referred to as the Avogadro variety.
The mole, symbol mol, is the SI unit of the quantity of substance. One mole includes precisely 6.022 a hundred and forty seventy-six x 1023 fundamental entities. This variety is the constant numerical price of the Avogadro consistent, NA, while expressed inside the unit mol–1 and is called the Avogadro number.
Calculation:-
2 Al + 3Cl₂ -----> 2AlCl₃
2 mole required = 3 moles of Cl
therefore 5.70 moles of Al required = 3/2 × 4.70
= 7.05 mole of Cl₂
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Rb element oxidation numbers
Answer:
+1.
Explanation:
Which scientist first proposed that the electron in the hydrogen atom can have only certain energies?.
Theoretical hydrogen atom models that Niels Bohr proposed helped to better understand the hydrogen atom's emission spectrum.
Describe the Bohr model.The tiny, positively charged nucleus in Bohr's theory is surrounded by orbiting, negatively charged electrons. An electron has more energy when it is further away from the nucleus than when it is nearer, according to Bohr.
What does Bohr's model have to say about the hydrogen spectrum?In order to explain the line spectra of the electron, Niels Bohr made the assumption that the electron traveled in circular orbits and that only orbits with specific radii were permitted in the hydrogen atom.
Why did Bohr employ hydrogen atoms?For instance, an atom of hydrogen has a lot of stable circular orbitals.
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A 43.40 mg sample of an alcohol contains 15.10 mg O, 22.6 mg C, and the rest is hydrogen. What its percent composition of carbon.
? ? C
The percentage composition of carbon in the given sample will be 52 %.
The ratio of amount of each element to the sum of all individuals components present in the given compound, multiplied by 100, it is the definition of the percentage composition of the given compound. The percent composition tells about the mass of each element in a compound. To find out the percent composition, we must first know the molar mass of the element.
Given that sample of alcohol is 43.40 mg
The alcohol contains the 15.10 mg O, and 22.6 mg C, and the rest is hydrogen.
The formula to calculate percent composition is
( 22.6 / 43.40 ) ×100 = 52 %.
Therefore, the percent composition of carbon is 52 %.
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Which unit cell is a simple cubic unit cell?
Answer:
his unit cell only contains one atom. Its packing efficiency is about 52%. To packing efficiency, we multiply eight corners by one-eighth (for only one-eighth of the atom is part of each unit cell), giving us one atom. An example of a Simple Cubic unit cell is Polonium.
Explanation:
A description of a unit cell in which a simple cubic unit cell is found in polonium.
How polonium is a simple cubic unit cellA simple cubic unit cell simply refers to that substance which consist of 8 different atoms in a cubic unit. When we look carefully into polonium, it usually, frequently and most of the time crystalizes in cubic unit. It is on this premise that we say that polonium is identified as a simple cubic unit cell?
So therefore, we can now confirm and also deduce from the explanation above that we a simple cubic unit cell has in itself eight corners of atoms.
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During aerobic respiration, h2o is formed. Where does the oxygen atom for the formation of the water come from?.
The oxygen atom for the formation of the water comes from molecular oxygen.
The non-metallic chemical element oxygen is found in Group 16 of the periodic table, generally known as the oxygen group (O). All living creatures require the colorless, tasteless, and odorless gas known as oxygen. When plants use it as a source of carbon and release the oxygen back into the environment, plants utilise the carbon dioxide that animals have taken up and converted it into.
Oxygen may react with almost every other element to form compounds in addition to reactions that remove elements from their combinations with one another. Combustions are the name for these reactions, which are typically accompanied by the creation of heat and light. The most important component is water.
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Use your understanding of the ideal gas law to
identify the correct relationships among the
variables.
Pressure is
Temperature is
Volume is
Moles are
The ideal gas relationships among the variables are PV = nRT
An ideal gas is a theoretical gas composed of many randomly transferring factor particles that aren't difficult to interparticle interactions. the best gasoline idea is beneficial because it obeys the precise gas law, a simplified equation of country, and is amenable to evaluation under statistical mechanics.
Volume is a degree of occupied three-dimensional space. it's far more frequently quantified numerically the usage of SI-derived gadgets or by way of diverse imperial gadgets. The definition of length is interrelated with the extent.
An ideal gas is described as one for which both the extent of molecules and forces between the molecules are so small that they have got no effect on the behavior of the gas. The real gas that acts almost like a really perfect gasoline is helium. that is due to the fact helium, in contrast to maximum gases, exists as an unmarried atom, which makes the van der Waals dispersion forces as low as viable
relation
PV = nRT
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Calculate empirical formula for each compound 0.2144 g N and 0.1224 g O
Empirical formula is N₂O
An empirical formula for a compound is the formula of a substance written with the smallest integer subscript
Here given data is
N = 0.2144 g
O = 0.1224 g
We have to calculate the empirical formula = ?
So mass of compound/moles
Empirical formula = 0.2144 g/14g/mol = 0.0153 mol
Empirical formula = 0.1224 g/16g/mol = 0.0076 mol
Then smallest mole value is 0.0076 mol
Divide the nitrogen mole by smallest value then
N = 2.0008
O = 1
Then take the closest whole number
Then the ratio is 2 : 1
So the empirical formula is N₂O
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PLEASE HELP!! WILL GIVE BRAINLIEST!!
A certain reaction is endothermic in the forward direction and has a greater number of molecules on the product side. Which set of conditions should be used to maximize the yield of the products? (5 points)
Group of answer choices
Decrease the temperature and decrease the pressure.
Increase the temperature and decrease the pressure.
Decrease the temperature and increase the pressure.
Increase the temperature and increase the pressure.
Answer:Decrease the temperature and increase the pressure
............................................................................................................................
Answer:
............................................................................................................................
Explanation:
because ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
The complete photoelectron spectrum for an element is shown above. Which of the following observations would provide evidence that the spectrum is consistent with the atomic model of the element?
answer choices
A neutral atom of the element contains exactly two electrons.
The element does not react with other elements to form compounds.
In its compounds, the element tends to form ions with a charge of +1.
In its compounds, the element tends to form ions with a charge of +3.
Evidence that the spectrum is consistent with the atomic model is that the neutral atom of an element contains exactly two electrons.
What is an element?It is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.
Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.
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Consider the following descriptions of the equation above. Which is true?
Fe2O3 + 2Al => 2Fe + Al2O3
Considering the given equation, the statement which is true for the given equation is that it is a displacement reaction.
The correct option is C.
What are chemical reactions?Chemical reactions are changes that occur in substances that involve changes in their chemical properties and the formation of new substances with properties different from the original substances.
Some of the several types of chemical reactions include:
combination reactions - these are reactions in which two or more substances combine to form a single substance.
A + B ---> ABdisplacement reactions - these are reactions in which one element or radical replaces another element or radical in a compound
AB + C --> CB + Adecomposition reactions - these are reactions in which one substance decomposes to give two or more substances.
A ---> B + Cdouble decomposition reactions - these are reactions in which there is an exchange of positive and negative ions by two compounds when they react.
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Complete question:
Consider the following descriptions of the equation above. Which is true?
Fe₂O₃ + 2 Al ---> 2 Fe + Al₂O₃
a. it is a combination reaction
b. it is a decomposition reaction
c. it is a displacement reaction
d. it is a double decomposition reaction
How many oxygen atoms does the compound 2ca3(PO4)2 have?
Answer:2
Explanation:
HELP PLEASE URGENT!!!!!
WILL GIVE BRAINIEST.
(CORRECT ANSWERS ONLY!!!!)
6.0 mol NaOH can form 3.0 mol Na3PO4 while 9.0 mole H3PO4 can form 9.0 mol Na3PO4. What mass of Na3PO4 forms?
Na3PO4: 164 g/mol
[?]g Na3PO4
Round your answer to the ones place.
Answer:
Hope this is the answer you want from the question.
6.0 mol NaOH can form 3.0 mol Na3PO4 while 9.0 mole H3PO4 can form 9.0 mol Na3PO4.mass of Na3PO4 forms 164 g/mol.
What is mass ?A body's mass is an inherent quality. Prior to the discovery of the atom and particle physics, it was widely considered to be tied to the amount of matter in a physical body.
Simply put, mass is a measurement of a body's amount of matter. Matter is everything that has both volume and mass. Although mass cannot be seen, it can be measured or quantified. Not all matter is visible. Typically, mass is expressed in kilogrammes, etc.
The quantity of matter or substance that makes up a thing is known as its mass. The unit of measurement is the kilogramme, abbreviated as kg. It's crucial to keep in mind that mass differs from weight.
Thus, 6.0 mol NaOH can form 3.0 mol Na3PO4 while 9.0 mole H3PO4 can form 9.0 mol Na3PO4.mass of Na3PO4 forms 164 g/mol.
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Since benzoin and meso-hydrobenzoin have similar melting points, how would you confirm that the product you obtained from this reaction is indeed meso-hydrobenzoin using only melting point techniques? describe briefly how you would carry out this experiment.
The products benzoin and meso-hydro benzoin melting points are same. Their temperature is 13341 degrees Celsius. Using the melting point method makes it challenging to directly determine. It would be necessary to determine the reaction's end product and then measure the melting point.
What does the melting point experiment aim to achieve?The thermal analysis that is most usually used to describe solid crystalline materials is melting point determination. It is used to identify solid crystalline chemicals and to assess their purity in research and development as well as in quality control in different industry areas.
The melting values of the products were between benzoin and meso-hydro benzoin 135 and 137, indicating that the molecule is likely benzoin because they are so similar to benzoin's melting points (135 to 137). Compared to hydroxybenzoic acid, benzoin has a melting point range that is closer to the finished product.
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list three ways in which the properties of metallic solids and ionic solids are different.
what is the IUPAC name of the following substance?
The IUPAC name of the following substance is 3-methylpent-2-ene.
What is IUPAC NAME?Th IUPAC nomenclature of an organic chemistry is defined as a method of naming of the organic chemical compounds which is recommended by the International Union of Pure and Applied Chemistry. It was published in the Nomenclature of Organic Chemistry.
Rules:Firstly, we check the chain having large number of carbon atoms. Since, the substance having longest chain contain five chain. Prefix is named by seeing the functional group. Since, methyl group is attached to the third carbon atom. Therefore, 3-methyl is suffix. This compound contains double bond. Therefore, ene is used as suffixThus, we concluded that the IUPAC name of the following substance is 3-methylpent-2-ene.
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