physical
It can be chemical but it's usually physical as the molecular structure doesn't change
C17H19NO3 compound, what is the percent by mass of carbon
Answer:
71.58%
Explanation:
Find the Mr of C₁₇H₁₉NO₃ :
(12 × 17) + 19 + 14 + (16 × 3) = 285
Mr of carbon in C₁₇H₁₉NO₃ :
12 × 17 = 204
Percent by mass of carbon = [tex]\frac{204}{285}[/tex] × 100 = 71.58%
as a real gas deviates from ideal gas behavior, the particles _____
Answer:
Have some attraction towards each other
Explanation:
Gases deviate from the ideal gas behavior because their molecules have forces of attraction between them. At high pressure, the molecules of gases are very close to each other so the molecular interactions start operating and these molecules do not strike the walls of the container with full impact.
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<3 simplysun
ps. I do not own any of these answers so please don't give full credit to me
what is kept constant is constant boyles law
Answer:
temperature, or true. I don't know which you want.
Explanation:
hope this helps
2KBr + Cl₂ → 2KCI + Br₂
What type of chemical reaction is this?
Answer:
Displacement reaction
Explanation:
A displacement reaction is a reaction where a more reactive halogen will displace a less reactive one.
Reactivity decreases down group 17. So Chlorine, being the more reactive halogen, substitutes in the place of Br which is less reactive.
An old 0.500 L lecture bottle of triethylamine (N(CH₂CH₃)₃) was found in a lab and needed for a synthesis reaction. A pressure regulator indicated a pressure of 27.0 psi, and the lab was at room temperature (25.0°C). What mass of vaporized triethylamine in grams was left in the lecture bottle?
Answer:
About 3.81 grams.
Explanation:
We can use the ideal gas law. Recall that:
[tex]\displaystyle PV = nRT[/tex]
Note that the universal gas constant R has the value 0.08206 L-atm/mol-K.
Hence, convert the measured pressure to atms (1 atm = 14.7 psi):
[tex]\displaystyle 27.0\text{ psi} \cdot \frac{1\text{ atm}}{14.7\text{ psi}} = 1.84\text{ atm}[/tex]
Rearrange the equation to solve for n, the number of moles of vaporized triethylamine and evaluate. The temperature is (25.0 + 273.15 ) K = 298.2 K:
[tex]\displaystyle \begin{aligned} n& = \frac{PV}{RT} \\ \\ & = \frac{(1.84\text{ atm})(0.500\text{ L})}{\left(\dfrac{0.08206\text{ L - atm}}{\text{mol-K}}\right)(273.2\text{ K})} \\ \\ &= 0.0376\text{ mol N(CH$_2$CH$_3$)$_3$}\end{aligned}[/tex]
Convert from moles to grams:
[tex]\displaystyle 0.0376\text{ mol N(CH$_2$CH$_3$)$_3$} \cdot \frac{101.22\text{ g N(CH$_2$CH$_3$)$_3$}}{1\text{ mol N(CH$_2$CH$_3$)$_3$}} = 3.81\text{ g N(CH$_2$CH$_3$)$_3$}}[/tex]
In conclusion, there is about 3.81 grams of vaporized triethylamine in the lecture bottle.
10) What volume of oxygen at STP must react with 5.8 L of hydrogen to form water?
(Hint: write and balance the reaction first)
The answer is 2.9L (I NEED THE STEPS)
2.9 L of oxygen are required to react with 5.8 L of hydrogen at STP to form water.
What is the balanced equation of the formation of water?Hydrogen gas and oxygen gas combines in a molar volume ratio of 2 : 1 to form water.
The equation of the reaction is given as follows:
2 H2O + O2 ----> 2 H2OThus, twice the volume of hydrogen is required with a given volume of oxygen to form water.
If 5.8 L of hydrogen is available for reaction at STP, the volume of oxygen required all be half of 5.8 L.
Volume of oxygen required = 5.8 / 2 = 2.9 L
Therefore, 2.9 L of oxygen are required to react with 5.8 L of hydrogen at STP to form water.
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Balance the N-14(d,n) nuclear equation for radioisotope production in PET. This means to
write it out in equation form with 2 reactants and 2 products.
If two metals had the same specific heat, how can we distinguish them in two ways?
Answer:
Specific heat is an intensive property (like density, color, etc.) that does not depend on the amount of a substance present. This allows substances to be identified using their specific heat. Imagine an unknown metal of known mass is heated to a known temperature.
Explanation:
8. Subshells half-filled with electrons are particularly stable. Can you suggest a possible physical basis for this claim?
The stability of atoms whose subshells are half-filled with electrons is due to equilibrium and symmetry.
How does subshells half-filled with electrons confer stability?The stability of an atom of an element depends on the number of electrons in its valence shell.
Atoms whose valence shells are completely filled are particularly stable atoms.
Similarly, subshells half-filled with electrons are particularly stable.
The stability of subshells half-filled with electrons can be explained based on equilibrium and symmetry.
A half-filled subshell distributes the energy of the electrons evenly and symmetrically such that the atom attians stability.
Therefore, stability of subshells half-filled with electrons is due to equilibrium and symmetry.
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When calcium carbonate is heated strongly, carbon dioxide is evolved.
CaCO3 > CaO + CO2
If 4.74g of calcium carbonate is heated, what volume of CO2 would be produced when collected at STP?
Show all steps (Answer: 1.06L)
If 4.74 g of calcium carbonate is heated, the volume of [tex]CO_2[/tex] that would be produced at STP will be 1.08 L
Volume of gas at STPFrom the equation of the reaction:
[tex]CaCO_3 --- > CaO + CO_2[/tex]
The mole ratio of [tex]CaCO_3[/tex] and [tex]CO_2[/tex] is 1:1
Mole of 4.74 g [tex]CaCO_3[/tex] = 4.74/100 = 0.0474 moles
Equivalent mole of [tex]CO_2[/tex] = 0.0474 moles
1 mole of gas at STP = 22.71 L
0.0474 moles at STP = 22.71 x 0.0474 = 1.08 L
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Brainliest to whoever answerers in time
Fireworks release A LOT of energy when they burn. According to the National Fire Protection Association, even a small sparkler can heat surroundings to more than 1,200ºF. What could make the combustion of gunpowder produce THAT MUCH heat?
Draw a model, create a graph, or write an explanation that includes:
How energy flows between the firework system and surroundings when bonds are broken and formed.
How the energy of breaking bonds compares relatively to the energy of bond formation in the combustion of gunpowder.
Explanation:
☹︎The base form (or root) of a verb is the form listed in the dictionary. It is the version of the verb without any endings (endings such as -s, -ing, and ed). The base form is the same as the infinitive (e.g., to walk, to paint, to think) but without the to.
Na
Η Ο
Is this an element or a compound?
Answer:
compound
Explanation:
because h is hydrogen, then O is oxygen
Predict the missing component in the nuclear equation
11C -> X + 0e
6 1
Answer:
A. Boron-11 with atomic number 5
How can we know if an element is more active than the other one, so that it will displace it in displacement reaction.
Answer:
In a reactivity series, the most reactive element is placed at the top and the least reactive element at the bottom.
How does the number of lone pairs affect the bonding pairs?
A. They repel more strongly than the bonding pairs, pushing the bonding pairs closer together.
B. They occur between the bonding pairs, pushing them to opposite sides of the central atom.
C. It does not affect them.
D. The pull the bonding pairs, widening the angle between them.
Answer:
A. They repel more strongly than the bonding pairs, pushing the bonding pairs closer together.
Explanation:
Lone pairs are in simple terms just pairs of electrons on the atom. Negative does not attract negative so it repels from the bonds. I put it in the most simple terms possible. Like with magnets north and north don't attract. Same concept
If the pressure inside a hyperbaric chamber is 3.0 atm, what is the volume, in liters, of the chamber containing 2600 g of O2 at 26 °C?
Moles of O_2
2600g/32gmol^{-1}81.25molNow
[tex]\\ \rm\Rrightarrow V=\dfrac{nRT}{P}[/tex]
[tex]\\ \rm\Rrightarrow V=\dfrac{81.25(26)(8.314)}{3}[/tex]
[tex]\\ \rm\Rrightarrow V=5854.4L[/tex]
The volume of the gas in the chamber is equal to 664.36 L.
What is the ideal gas equation?The ideal gas law is defined as an equation of the state of an ideal gas. This equation is written as the product of the volume and pressure of 1 mole gas is equal to the product of the gas constant and absolute temperature of the gas.
The mathematical formula of the ideal gas law is as follows:
PV = nRT
Where n is the moles of gas, V is the volume of the gas, R is the gas constant and P is the pressure.
The temperature of the gas in the chamber, T = 26° C = 299 K
The pressure of the gas, P = 3 atm
The value of the gas constant, R = 0.082 atm L/K mol
The number of moles of a given gas, n = 2600/32 = 81.25 mol
Substituting the values n, R, P, and T in the equation, we get:
3 × V = 81.25 × 0.082 × 299.15
V = 664.36 L
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Your car breaks down. As your friends help
you puch it, it begins to move and speed
up.
try stopping putting the car in park before fixing
What is the electro negativity difference for CO ?
The electronegativity of carbon is about 2.5 , and that of oxygen is about 3.5 , and naturally, (3.5−2.5=1.0)>0 . So, the electronegativity difference is greater for a C−O single bond than a F−F single bond.
Answer:
1.0
I hope my answer helps you.
A fossil is 3 half-life old. Measured Uranium-235 has half-life of 704 million years. How many years old is this fossil?
Answer: Uranium is not a problem in this case, as its radioactivity is very low. This is due to the long half-life. How much uranium will decay per second with a half-life of 700 million years? This is a very insignificant figure.
Write the essential condition for the following reaction to take place:2AgBr—->2Ag+Br
This is the decomposition of silver bromide
Silver bromide decomposes to give silver and bromine
Sunlight is the decomposing agent .
The reaction takes place in sunlightHence it should be placed in sunlightAnswer:
Sunlight
Explanation:
For silver bromide (AgBr) to decompose into silver metal and bromine gas, it can only take place in the presence of sunlightThe balanced reaction :⇒ 2AgBr → 2Ag + Br₂Which 2 elements has reactivity that is similar to chlorine?
Is the bonding in carbon tetrachloride, CCl4 covalent or ionic? Explain how you know.
Answer:
covalent
Explanation:
It is between two nonmetals so it is covalent. It would be ionic if it were between a metal and a nonmetal.
Carbon tetrachloride, CCl₄ is a colorless organic compound with a sweet smell and is used as a refrigeration fluid. The covalent bonding is seen in the carbon tetrachloride compound.
What is covalent bonding?Covalent bonding is the chemical interaction that has been constituted of electron sharing between the atoms of the elements in the molecule or the compound.
This type of chemical bonding is seen when the difference between the electronegativities between the elemental atom is very small to initiate the electron transfer.
In carbon tetrachloride, carbon has 4 valence electrons whereas chlorine has 1 valence electron in its outer shells. The four Cl shares their electrons with the carbon atom to complete their octet.
Therefore, carbon tetrachloride shows covalent bonding.
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Which of the following is NOT an example of potential energy?
A. Gravitational pull C. Chemical Bonds
B. Nuclear energy D. Electricity
Answer:
Answer C
Explanation:
Chemical Bonds
H2O2_H2O+O2 balance the equation using inspection
Answer:
2H2O2 → 2H2O + O2
Which boilers recovers waste heat from a process?
[tex]\large\red{\underline{\textbf{Given:-}}}[/tex]
Answer:
WHR Boilers
Explanation:
I hope this helps.
How many grams of CO2 are produced from the burning of 3.0 mol of amyl alcohol?
2C5H11OH + 15O2➡️ 10CO2 + 12H2O
*Please show work
The amount, in grams, of [tex]CO_2[/tex] that would be produced from the burning of 3.0 mol amyl alcohol would be 660.15 grams
Stoichiometric calculationFrom the equation of the reaction:
[tex]2C_5H_1_1OH + 15O2 ---- > 10CO_2 + 12H_2O[/tex]
The mole ratio of amyl alcohol to the [tex]CO_2[/tex] produced is 2:10.
Thus, for 3.0 mol of amyl alcohol, 15 mol of [tex]CO_2[/tex] would be produced.
Mass of 15 mol [tex]CO_2[/tex] = 15 x 44.01 = 660.15 grams
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Consider these equations: 2S(s)+3O2(g)→2SO3(g) , ΔH=−792kJ 2S(s)+2O2(g)→2SO2(g) , ΔH=−594kJ 2SO2(g)+O2(g)→2SO3(g) , ΔH=? What is the missing ΔH ? −294kJ −198kJ +198kJ +294kJ
Hess law can help us to obtain the enthalpy of a series of reactions by summation. The missing enthalpy of this reaction is −198kJ.
What is Hess law?According to the Hess law of constant heat summation, the enthalpy of a sequence of reactions can be obtained as the sum of the enthalpies of all the reactions.
Now looking at all the reavtion written here in order to obtain the missing enthalpy, we conclude that the missing enthalpy is −198kJ.
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2SO2 (g) + O2 (g)→2SO3 (g), ΔH = −198 kJ.
why is accurate body measurement important in dressmaking
Answer:
Without taking body measurements, the fabric material can run out of supply if the tailor uses it too much. And more material is required to fix small dresses or suits. So when body measurements are taken accurately, the tailor will know the exact amount of material to be used.
Explanation:
A molecule that is either cycloheptane or cycloheptene is treated with bromine and the sample immediately absorbs the red bromine color—which compound is present?
Since the molecule is able to immediately absorb the red color of the bromine, the molecule would be cycloheptene.
What is unsaturation?Unsaturation in organic compounds refers to the presence of double or triple bonds in the compounds.
One way to test for unsaturation is to use bromine water. A saturated compound will not be able to absorb bromine because it is already saturated.
An unsaturated compound, on the other hand, will be able to absorb bromine due to the unsaturation. Therefore, the red color of bromine will disappear due to absorption.
Cycloheptane is saturated while cycloheptene is unsaturated. Thus, the latter will absorb the red color of bromine.
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If 10.0 moles of O₂ are reacted with excess NO in the reaction below, and only 8.0 mol of NO₂ were collected, then what is the percent yield for the reaction?
2 NO (g) + O₂ (g) → 2 NO₂ (g)
Answer:
Explanation:
General Remarks
The balance numbers are the same. (The balance numbers are 2 and 2)
The balance number in front of the O2 is 1.
So for every mole of O2 needed 2 moles of NO2 should be produced.
If 10.0 moles of oxygen is used, then you should get 20 mols of NO2 should be produced.
Formula
% yield = (what was produced / what should have been produced) *100
Givens
What was produced = 7 moles
What should have been produced = 20 moles
Solution
Substitute the givens into the equation
% yield = 8/20 * 100
% yield = 0.40 * 100
Answer: 40%