Step 1 - Discover the relation between moles and volume
The gas state equation states that:
[tex]pV=\text{nRT}[/tex]Since the exercise says that both pressure and temperature will remain the same ("under the same conditions"), and R is already a constant, we can obtain a direct relation between moles and volume:
[tex]V=n(\frac{RT}{P})\rightarrow V\propto n[/tex]Since R, T and P will not vary, the quocient in parenthesis is a constant. Therefore, the volume will be directly proportional to the number of moles of gas.
Step 2 - using the relation to solve the problem
Since, as we saw, volume and moles are directly proportional to each other, we can set the following proportion to discover the new volume:
[tex]\begin{gathered} 0.19\text{ moles of N2----2.25 L} \\ 0.27\text{ moles of N2-----x} \\ \\ x=\frac{0.27\times2.25}{0.19}=3.19\text{ L} \end{gathered}[/tex]So, the volume of 0.27 moles of N2 gas, under the same conditions, will be 3.19 L.
Which of the following can be calculated from the mass of the reactants used in a chemical reaction?Amount of limiting reactant used in a reactionActual yield of productsAmount of excess reactant from a reactionTheoretical yield of products
Explanation:
There are some options that are correct.
1) Amount of limiting reactant used in a reaction.
It can be calculated from the quantity of the reactants.
------
2) Amount of excess reactant from a reaction
It can be also calculated from the quantity of the reactants.
------
3) Theoretical yield of products
Answer:
Amount of limiting reactant used in a reaction
Amount of excess reactant from a reaction
Theoretical yield of products
1. What are the similarities and differences between Electronegativity and Ionization Energy?
Electronegativity and Ionization energies are similar because they both explain the interactions between an atomic nucleus and electrons.
However, they are different because electronegativity explains the attraction of electrons while the ionization energy is about the removal of electrons from an atom.
A student drew a model of two liquids. One hot and one cold. How would the student draw this? Choose all that applies?
A. Models should show two separate containers of liquid.
B. Models should show one container of liquid.
C. There should be something to represent the molecules in the liquid.
D. There should be something to represent air in the liquid.
E. The student should put longer arrows on the cold liquid and short arrows on the warm liquid. The arrows show the speed of the molecular movement.
F. The student should put shorter arrows on the cold liquid and longer arrows on the warm liquid. The arrows show the speed of the molecular movement.
G. There should be a key to tell what the arrows represent and how the molecules are represented.
Please answer ASAP! Will reward.
Models should show two separate containers of liquid and There should be a key to tell what the arrows represent and how the molecules are represented.
It is the lowest point in the substance and has chemical elements. Atoms don't exist on their own; instead, they combine to create ions and molecules, which combine to create the substances that we can see, feel, and touch.
One or more atoms joined together by covalent (chemical) bonds make up molecules. Atoms may be seen as circles with a central nucleus (consisting of protons and neutrons) and one or more concentric circles around it that represent the "shells" or "levels" in which the electrons surrounding the atom's nucleus are placed as well as marks that distinguish the electron. every level
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Which of the following is a correct example of physical change?1. Burning a piece of wood2. Rusting of an object's surface3. Cutting up a piece of paper4. Changing the chemical identity of a substance
Let's talk about physical and chemical changes:
A Physical change is a type of change where the physical properties of matter change. A change of state of matter, change in colour, odour, solubility, etc. all are examples of physical change. During a physical change, neither the composition nor the chemical nature of matter is changed.
A chemical change is a change of materials into another, new materials with different properties and one or more than one new substances are formed. It results when a substance combines with another to form a new substance (synthesis or either decomposes to form more substances).
According to the definitions given, then from the options given the correct example of physical change is 3. Cutting up a piece of paper.
The solvent in a collodial system is alsoknown as the [?] phase.ABdispersedparticledispersionmedium
Answer:
[tex]Dispersed\text{ Medium}[/tex]Explanation:
Here, we want to know what the solvent in a colloidal system is called
The solvent is the medium in which we have the solute dissolved
While the solute is called the dispersed phase, the solvent is known as the dispersed medium
Order the following elements from smallest to largest
Answer: F, O, N, C, B
Explanation: The element with the greatest electronegativity will have the smallest radius because it holds the electrons closest to the nucleus. Fluorine is the most electronegative element (it is in the upper right of the periodic table), Francium is the lease (it is the lower left of the periodic table). With this knowledge, you should be able to recognize a trend in the periodic table associated with atomic radius size and electronegativity.
Mg(OH)₂ + 2HNO₃ → Mg(NO₃)₂ + 2H₂OWhy is this a balanced chemical equation?
The quemical equation is balanced because the total number of each element on the reactants side (to the left of the arrow) is equal to the total number of each element on the products side (to the right of the arrow).
For example, on the reactants side there are:
- 1 Mg
- 8 O
- 4 H
- 2 N
And, on the products side there are:
- 1 Mg
- 2 N
- 8 O
- 4 H
What is the molarity of a 0.75 L solution that contains 9.2 g of NaCl?
The molarity of the solution is 0.209 M.
Molarity is an expression of the concentration of a compound and it is represented in mole/liter.
So, we need to know how many moles tha sample has.
- First, with the molar mass of the NaCl molecule we calculate the number of moles conteined in 9.2g of NaCl:
NaCl molar mass= 58.44g/mol
[tex]\frac{9.2g\text{ . 1mol}}{58.44g}=\text{ 0.157 moles}[/tex]- Second, molarity is expressed in 1 liter, so we calculate the number of moles that are conteined in 1 liter:
[tex]\frac{1L\text{ . 0.157moles}}{0.75L}=0.209\text{ moles}[/tex]- So, the molarity of the solution is 0.209 M.
12. The list below shows four different substances.
1.03
II. Fe
III. NaCl
IV. CO₂
Which of the substances listed contain only one type of atom?
Answer:
Explanation:
1. O3 compound name ozone make up of only one type of atom oxygen.
2. Fe is an element that contain only iron atom.
3. NaCl sodium chloride is a compound that contains 2 types of atoms sodium and chlorine.
4. CO2 carbon dioxide contains one carbon and two oxygen atom.
Only O3 and Fe contain only one type of atom.
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Please help me find the final answer for number six
1.28x10^23 molecules of carbon dioxide are expelled.
1st) It is necessary to write the balanced equation of combustion from sugar:
[tex]C_{12}H_{22}O_{11}+12O_2\text{ }\rightarrow12CO_2+11H_2O[/tex]2nd) We need to look for the molar mass of C12H22O11 and CO2 to make a relation between those values:
- C12H22O11 molar mass: 342 g/mol
- CO2 molar mass: 44 g/mol
3rd) According to the balanced chemical equation, 1 mol of C12H22O11 produces 12 moles of CO2. Using the molar mass of the compound, in grams, 342g of C12H22O11 produces 528 g (44gx12) of CO2.
Now, with a mathematical Rule of Three we can find the amount of CO2 that is produced from 6.06g of C12H22O11:
[tex]\begin{gathered} 342gC_{12}H_{22}O_{11}-528gCO_2 \\ 6.06gC_{12}H_{22}O_{11}-x=\frac{6.06g\cdot528g}{342g} \\ x=9.36gCO_2 \end{gathered}[/tex]4th) Knowing that 6.06g of jolly rancher produces 9.36g of carbon dioxide, and using the Avogadro's number (6.022x10^23 molecules/mol), we can find the molecules of CO2:
[tex]\begin{gathered} 44gCO_2-6.022\cdot10^{23}molecules \\ 9.36gCO_2-x=\frac{9.36gCO_2\cdot6.022\cdot10^{23}molecules}{44gCO_2} \\ x=1.28\cdot10^{23}molecules \end{gathered}[/tex]So, 1.28x10^23 molecules of carbon dioxide are expelled from the combustion of one jolly rancher.
We can write it in just one equation like this:
[tex]6.06g\cdot\frac{528g}{342g}\cdot\frac{6.022\cdot10^{23}\text{molecules}}{44g}=1.28\cdot10^{23}molecules[/tex]And the result will be the same.
Calculate the volume of 77.58 g of zinc (density=7.000 g/cm³).
Volume of 77.58 g of zinc is calculated as , volume= 11.08 cm^3
What is mass and volume?Mass measures the amount of matter in a substance and SI unit for mass is the kilogram. Volume measures the amount of space that a substance takes up and SI unit for volume is cubic meter. Volume of the object is directly proportional to its mass such that as the volume increases the mass of the object increases.
Given, mass of zinc = 77.58g
We know that density of zinc = 7g/cm^3
1cm^3 of zinc will move 7gm
Let volume be x
x= 77.58/7
Volume = 11.08 cm^3
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4 Si + S8 --> 2 Si2S4
We usually represent a synthesis like this:
A + B ------> AB
So, when looking at our equation, it is really similar to it
4 Si + S8 ----> 2 Si2S4
We are combining two compounds to get a different one
Which of the following relates the volume of a gas to the number of molecules of a gas?Group of answer choicesBoyles's lawCharles's lawDalton's lawGrahams's lawAvogadro's hypothesis
Explanation:
Avogadro's hypothesis or Avogadro's law states that two volumes (equal volumes) of any gas at the same temperature and pressure contain the same number of molecules.
Answer: Avogadro's hypothesis
Calculate the mass/volume percent (m/v) of 16.0 g NaCl in 50.0 mL of solution.Express your answer to three significant figures.
Answer
The mass/volume percent = 16/50 x 100% = 32%
Explanation
Given:
Mass of NaCl, m = 16.0 g
Volume of solution, v = 50.0 mL
What to find:
The mass/volume percent.
Solution
The mass/volume percent of the solution can be calculated using the formula below
[tex]Percent\text{ }mass\text{/}volume=\frac{Mass}{Volume}\times100\%[/tex]The mass/volume percent = 16/50 x 100% = 32%
PLEASE HELP - 100 PTS AND BRAINLIEST
Indicate the number of protons, neutrons, and electrons in isolated ions having the following nuclear symbols:
a) 19F1- has ? protons, ? neutrons, and ? electrons.
b) 24Mg2+ has ? protons, ? neutrons, and ? electrons.
c) 56Fe3+ has ? protons, ? neutrons, and ? electrons.
The number of protons, neutrons, and electrons in isolated ions having the following nuclear symbols:
a) ¹⁹F⁻ has 9 protons , 9 neutrons , 10 electrons
b) ²⁴Mg²⁺ 12 protons , 12 neutrons , 10 electrons
c) ⁵⁶Fe³⁺ 26 protons , 26 electrons , 23 electrons
The atomic number of element represent the number of protons present. the no. of electrons is equals to no. of protons for neutral. the difference between mass no. and the atomic no. is equals to the no. of neutrons.
a) The atomic number of Fluorine is 9. for neutral fluorine the no. of proton is 9 , no. of neutron is 9 , no. of electron is 9. negative sign represent one extra electron.
¹⁹F⁻ has 9 protons , 9 neutrons , 10 electrons
b) The atomic number of Mg is 12. + 2 represents that 2 electrons are removed from the neutral Mg.
²⁴Mg²⁺ 12 protons , 12 neutrons , 10 electrons
c) The atomic number of Fe is 26.
⁵⁶Fe³⁺ 26 protons , 26 electrons , 23 electrons
Thus, The number of protons, neutrons, and electrons in isolated ions having the following nuclear symbols:
a) ¹⁹F⁻ has 9 protons , 9 neutrons , 10 electrons
b) ²⁴Mg²⁺ 12 protons , 12 neutrons , 10 electrons
c) ⁵⁶Fe³⁺ 26 protons , 26 electrons , 23 electrons
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Is the bond length shorter for elements that have more bonds in between them. Like would N2 have a shorter bond length than O2Would N2 have a shorter bond length than O2Because N2 has a triple bond?
Covalent bonding
Covalent Bond
-----
Bonds order is the number of chemical bonds between a pair of atoms and indicates the stability of a bond. Bond order and bond length indicate the type and strength of covalent bonds.
Bond order and length are inversely proportional to each other: when bond order is increased, the bond length is decreased.
O2: O=O
N2: N≡N
N2 has a shorter length than O2
How much potential energy does a 20-kg New Year’s Eve ball have at the top of a 100-m-tall pole?
Answer:
First you need velocity. And hight is 10 m. Now the velocity. Let. g = 10m/s. V=mgh. V= 20 . 10. 10. 2000m/s. Now the kinetic energy will be. Ke = 1/2 mv^2.
Calculate the theoretical pH at equivalence for this titration. Show all your work. 10.00mL of methanoic acid initial volume
According to the problem we are adding a 0.1 M solution of KOH to a 0.1 M solution of HCOOH. So, we are titrating a weak acid using a strong base.
The reaction that describes this titration is:
HCOOH (aq) + KOH (aq) <----> HCOOK (aq) + H₂O (l)
The reaction is 1 to 1, since all the coefficients are 1.
The equivalence point occurs when equal number of moles of acid reacts with equal number of moles of base.
Let's find the initial number of moles of metanoic acid that we had:
Initial number of moles of HCOOH = 10.00 mL * 0.1 mmol/mL
Initial number of moles of HCOOH = 1.00 mmol
In the equilibrium point we need the same number of moles of the strong base.
Moles of KOH =
Given that4 NH3 (g) + 5 O2(g) > 4 NO(g) + 6 H2O(g)If 8.20 moles of NH3 react with sufficient oxygen, how many moles of water should form?1. 6.11 moles2. 12.0 moles3. 22.0 moles4. 8.25 moles5. 15.1 moles
Answer:
[tex]12.3\text{ moles}[/tex]Explanation:
Here, we want to get the number of moles of water that would form
From the equation of reaction, 4 moles of ammonia produced 6 moles of water
However, 8.2 moles of ammonia will produce x moles of water
To get the value of x, we have it that:
[tex]\begin{gathered} \text{ 4 }\times x\text{ = 8.2}\times\text{ 6} \\ x\text{ = }\frac{8.2\text{ }\times6}{4} \\ \text{ x= 12.3 moles} \end{gathered}[/tex]What role does water play in assembling and decomposing polysaccharides?
INFORMATION:
We need to determine the role of the water in assembling and decomposing of polysaccharides
STEP BY STEP EXPLANATION:
To determine it, we need to know the process of decomposing polysaccharides:
Process of decomposing polysaccharides:
Polysaccharides can be broken down, by hydrolysis of the glycosidic bonds between residues, into smaller polysaccharides as well as disaccharides or monosaccharides. Its digestion within the cells, or in the digestive cavities, consists of a hydrolysis catalyzed by digestive enzymes (hydrolases) generically called glycosidases, which are specific for certain polysaccharides and, above all, for certain types of glycosidic bond. Thus, for example, the enzymes that hydrolyze starch, whose bonds are of the type called α(1→4), cannot break down cellulose, whose bonds are of the β(1→4) type, although in both cases the monosaccharide be the same. Glycosidases that digest polysaccharides, which may be called polysaccharides, generally break every other bond, thus releasing disaccharides and leaving other enzymes to complete the job later.
Now, knowing that we can decompose polysaccharides by hydrolysis and using that hydrolysis is
in which the water molecule divides and breaks one or more chemical bonds and its atoms go on to form a union of another chemical species, we can say that water plays the role of divide their molecules and break one or more chemical bonds so that their atoms form a union and the polysaccharides break down into disaccharides or monosaccharides.
ANSWER:
water plays the role of divide their molecules and break one or more chemical bonds so that their atoms form new unions and the polysaccharides break down into disaccharides or monosaccharides.
Fe^2O^3Express your answer as an ion.
Answer:
[tex]Fe_2^{3+}O_3^{2-}.[/tex]Explanation:
Remember that the algebraic sum of the oxidation states of a compound must be zero.
Oxygen always has the oxidation state -2.
In this case, for Fe, we have two options of oxidation state (+2 and +3).
As the algebraic sum must be zero, and we have 3 oxygens in Fe2O3, multiplying -2 by 3, we obtain -6, so we need to find the oxidation state of Fe that sum with -6, the result is zero. If the oxidation state of Fe is +3, multiplying this number by the two Fe that we have, we obtain +6, so the algebraic sum is: -6 +6 = 0.
The ion form, in this case, will look like this:
[tex]Fe_2^{3+}O_3^{2-}.^[/tex]6. What number uniquely identifies an element?
Answer:
atomic number
Explanation:
"The atomic number uniquely identifies a chemical element. It is identical to the charge number of the nucleus. In an uncharged atom, the atomic number is also equal to the number of electrons."
HELP ME OUT PLEASE!!!
Why is it significant to strip only one side of the wire?
In a good scientific experiment, the dependent variable depends on the…Select oneA. Experimental constantsB.independent variableC.experimental errorD.none of these
Answer:
[tex]B:\text{ Independent variable}[/tex]Explanation:
Here, we want to get the variable on which the dependent variable depends on
The dependent variable value is affected by some values which do not depend on other values
These values that are independent of other values are referred to as the independent variable
Beneath each word equation, write and balance the formula equation. Rememberthat several elements exist as diatomic molecules. Dinitrogen pentaoxide -> nitrogen +oxygen
Dinitrogen pentaoxide ===> nitrogen + oxygen
Dinitrogen pentaoxide = N2O5
Nitrogen (remember diatomic) = N2
Oxygen (remember diatomic) = O2
The reaction:
N2O5 ===> N2 + O2
To balance, we must have the same number of atoms on both sides.
So, you must add some numbers in front of each molecule.
Answer: 2 N2O5 ===> 2 N2 + 5 O2 (the balanced reaction)
How can a reaction with a negative value of ▲ Gº be described?OA. As exothermicOB. As spontaneousOC. As endothermicOD. As nonspontaneous
Answer: A negative value of ΔG describes a spontaneous reaction (letter B).
Explanation:
The question requires us to choose the correct option that describes a reaction with negative value of free energy change (ΔG).
Free energy (G) refers to the energy that is available to a system to do work. It refers to the spontainety of a chemical reaction rather than the heat energy that is released or absorbed by the system as the reaction occurs.
As the spontainety of a reaction is determined by the enthalpy and entropy changes (ΔH and ΔS, respectively) that occur in the system, free energy change (ΔG) can be defined in terms of ΔH and ΔS:
[tex]ΔG^°=ΔH^°-TΔS^°[/tex]A spontaneous chemical reaction is one that releases energy, thus the reaction will be spontaneous when ΔG value is negative.
Answer:
Exothermic is the best choice.
Explanation:
A negative sign for ΔG means that energy was released from the system. The term for that is exothermic (exo means outside). Endothermic reaactions absorb energy from their surroundings. [They are no fun.] Spontaneous reactions can be endothermic or exothermic. Most will be exothermic, so it is tempting to select this as the answer. But all exothermic reaction have a negative ΔG, so it is the best choice.
Which of the following correctly identifies the intermolecular force represented by A and compares its strength relative to the intermolecular force represented by B? A represents London dispersion forces, which are weaker than the force represented by B. A represents hydrogen bonding, which is weaker than the force represented by B. A represents London dispersion forces, which are stronger than the force represented by B. A represents hydrogen bonding, which is stronger than the force represented by B.
Answer
A represents London dispersion forces, which are weaker than the force represented by B.
Explanation
London dispersion, also called van der Waals forces are caused by the distribution of electrons throughout the molecule/atom of the compound. It is the weakest intermolecular force. The London dispersion force is a temporary attractive force that results when the electrons in two adjacent atoms occupy positions that make the atoms form temporary dipoles. This force is sometimes called an induced dipole-induced dipole attraction. London forces are the attractive forces that cause nonpolar substances to condense to liquids and to freeze into solids when the temperature is lowered sufficiently.
According to the given chart, the statement which correctly identifies the intermolecular force represented by A and compares its strength relative to the intermolecular force represented by B is: A represents London dispersion forces, which are weaker than the force represented by B.
Hence, the first option is the correct answer.
Answer:A represents London dispersion force which are weaker than the force represented by B
Explanation:
If I have an unknown quantity of gas at a pressure of 120 kPa, a volume of 19 liters, and a temperature of 35°C, how many moles of gas do I have? (Convert temperature to K, and do not include the units in the answer)
Answer:
Explanations:
Using the ideal gas equation expressed as:
[tex]PV=\text{nRT}[/tex]P is the given pressure of the gas
V is the volume of the gas
n is the number of moles
R is the gas constant
T is the temperature in Kelvon.
Given the following parameters:
Give 2 ways to distinguish between carbon(iv) oxide and carbon (ii) oxidedifferentiate the physical properties of the two oxides of carbon
You can note that the roman numerals in the parenthesis of carbon (IV) oxide and carbon (II) oxide indicate the oxidation state of carbon.
Remember that oxides are compounds that are formed with oxygen and another element, in this case, is carbon. It's important to clarify that the oxidation state of oxygen is always -2. The algebraic sum of the oxidation states must be zero.
One way to distinguish this is to write the oxidation state in every element and then, put these numbers on the other element. Let's see this with the example of carbon (IV) oxide (IV is 4):
And for carbon (II) oxide, we can do the same:
Carbon (IV) oxide is CO2 because the oxidation state of carbon is +4 and carbon (II) oxide is CO because the oxidation state of carbon is +2.
Between the physical properties of CO, we have that it's a colorless compound, at ambient temperature is a gas and it's odorless.
For CO2, it's a gas at an ambient temperature too, it's odorless too at low concentrations and it is denser than air.
9. You have 500 grams of Cu2S. How many particles are present?
Explanation:
Before we find the number of particles, we have to find the number of moles that are present in 500 g of Cu₂S using the molar mass of it.
molar mass of Cu = 63.55 g/mol
molar mass of S = 32.07 g/mol
molar mass of Cu₂S = 2 * 63.55 g/mol + 1 * 32.07 g/mol
molar mass of Cu₂S = 159.17 g/mol
mass of Cu₂S = 500 g
moles of Cu₂S = 500 g/(159.17 g/mol)
moles of Cu₂S = 3.14 moles
According to Avogadro's Number there are 6.022 *10^23 particles in 1 mol of Cu₂S. Let's use that relationship to find the answer to our problem.
1 mol of Cu₂S = 6.022 * 10^23 particles
number of particles = 3.14 moles * 6.022 *10^23 particles/mol
number of particles = 1.89 *10^24 particles
Answer: There are 1.89 *10^24 particles in 500 g of Cu₂S.