The mass in grams of He are necessary to fill a balloon having a volume of 4.50×10³ mL to a pressure of 1.14×10³ torr at 25.0ºC is 1.104 grams.
How do we calculate the grams from moles?Mass (W) in grams from moles (n) will be calculated by using the below equation:
n = W/M, where
M = molar mass
Moles of helium gas will be calculated by using the ideal gas equation:
PV = nRT, where
R = universal gas constant = 62.363 L.torr / K.mol
P = pressure of gas = 1.14×10³ torr
V = volume of gas = 4.50×10³ mL = 4.50 L
n = moles of gas = ?
T = temperature = 25.0ºC = 298 K
On putting these values on the ideal gas equation, we get
n = (1140)(4.5) / (62.363)(298) = 5130 / 18584
n = 0.276 moles
Now we convert this moles into mass by using the first equation as:
W = (0.276mol)(4g/mol) = 1.104 g
Hence required mass of helium gas is 1.104 grams.
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Hypothesis for candy bar density lab
Need answer ASAP!!!!!
10 grams CH10 + excess O2 → ? grams CO2 + H2O
Answer:
20 gm CO2
Explanation:
CH10 mole weight = ~ 22 gm
each 22 gm CH10 produces 44 gm CO2
44 / 22 = x / 10 = 20 gm
What's the name of this molecule?
Answer:
option d
Explanation:
Order the following pH values from most acidic to least acidic (most basic).
5.7
7.0
1.2
9.1
Answer: 1.2 to 5.7 to 7.0 to 9.1
Explanation: Highest acidic begins with 1
What is the molarity of HCl found in a titration where 30 mL of HCl is titrated with 15 mL of 0.1 M NaOH
The molarity of HCl is found in a titration where 30 mL of HCl is titrated with 15 mL of 0.1 M NaOH is 0.05 M.
What is molarity?Molarity is the measure of the concentration of any solute per unit volume of the solution.
The reaction is [tex]\rm NaOH(aq)+HCl(aq) \rightarrow H2O(l)+NaCl(aq)[/tex]
The ratio is 1:1
Step1- to calculate the equal moles of HCl
[tex]\dfrac{0.1\;mol\;NaOH}{ L} \times 15\;ml = 1.5\; mmol[/tex]
Step2: Calculate the molar concentration
[tex]\dfrac{1.5 \; m mols\;HCl}{ 30\;ml\;HCl} = 0.05 \;M \;HCl[/tex]
Thus, the molarity of HCl is 0.05 M.
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Question 3 (1 point)
Electrochemical processes involve redox reactions because electrons are transferred.
O True
O False
Question 4 (1 point)
The activity series of metals helps determine the result of chemical reactions.
O True
O False
An electrochemical process involves any process that has to do with the transfer of elecrons.
What is an elecrochemical process?An electrochemical process involves any process that has to do with the transfer of elecrons. These process include redo reactionand electron transport chains.
It is a true statement that the actiivity series helps to detect the products in a reaction because a metal that is lower in the series is always displaced by a metal that is higher in the series.
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_____ are considered dietary proteins.
A. apples
B. oils
C. eggs
D. potatoes
Answer:
Eggs
Explanation:
Apple = fruit
Oils = fat
Potatoes = Carbs
And eggs are the only proteins
A nearly complete skeleton, ____ is a classic example of a Neanderthal with many defining Neanderthal characteristics. Group of answer choices Taung Child La Ferrassie 1 Piltdown Man KNM-ER 1805
Answer: La Ferrassie 1
Explanation: La Ferrassie 1, often referred to as LF1, is a male Neanderthal skeleton estimated to be 70–50,000 years old. It was discovered at the La Ferrassie site in France by Louis Capitan and Denis Peyrony in 1909. The skull is the most complete Neanderthal skull ever found.
In calculating a percent yield, you need a theoretical yield. Where does the theoretical yield come from?
Answer: Calculated results
Explanation:
Water is able to act as an acid in some reactions.
T/F
Answer:
True.
Explanation:
Water can act as a base or an acid. This means it is amphiprotic.
Give an example of a polymer formed by addition polymerization.
Answer:
During the addition polymerization, all monomers are consumed and no byproducts are formed. Common examples of addition polymerization are polyethylene, polyvinyl chloride (PVC), acrylics, polystyrene, polytetrafluoroethylene, and polyoxymethylene (acetal).
What is meant by addition polymer?
In polymer chemistry, an addition polymer is a polymer that forms by simple linking of monomers without the co-generation of other products. Addition polymerization differs from condensation polymerization, which does co-generate a product, usually water.
Explanation:
A solid substance turns directly into a gas. Which term describes this change?
deposition
evaporation
melting
sublimation
Answer:
sublimation
Explanation:
Deposition is like dew forming
evaporation is going from liquid to gas
melting is going form solid to liquid ( like ice does when it warms)
sublimation is going from solid directly to gas ( like moth balls)
Given the reaction:
4 HCl(aq) + MnO2(s) MnCl2(aq) + 2 H2O() + Cl2(g)
The manganese is
A) reduced and its oxidation number changes from +4 to +2
B) reduced and its oxidation number changes from +2 to +4
C) oxidized and its oxidation number changes from +4 to +2
D) oxidized and its oxidation number changes from +2 to +4
Redox is the oxidation-reduction reaction that includes the gain and loss of electrons. The oxidation of the manganese changes from +4 to +2 and gets reduced.
What are oxidation and reduction?In a redox reaction, the electrons are gained and lost by the chemical species. In oxidation, the electrons are lost by the species to another, while in reduction the electrons are gained by the species.
When the electrons are lost by the species their oxidation number gets increased, whereas when the species gains electrons their oxidation state decreases.
The oxidation number of manganese oxide and manganese(II) chloride is calculated as:
[tex]\begin{aligned}\rm Mn^{x}O_{2}^{2-}: \rm x -4 &= 0\\\\&= +4\end{aligned}[/tex]
and,
[tex]\begin{aligned}\rm Mn^{x}Cl^{2-}: x -2 &= 0\\\\&= +2\end{aligned}[/tex]
Therefore, the manganese is option A. reduced, and the oxidation number changes from +4 to +2.
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Which part of experimental design is most important to a scientist when replicating an experiment?.
Answer:
A split-plot design lets us replicate our treatments twice using only 24 runs in a single time period, hence it is the most efficient use of resource.
Explanation:
hope this helps
Are all the atoms in the same plane for cyclohexanone.
Answer:
the atoms in cyclohexanone are not in the same
Explanation:
but they are in a benzene ring! Cyclohexane has only sigma bonded carbons with bonds that stick out of the plane
Which electrode gets heavier in an electrolytic cell?
OA. The electrode where reduction occurs
OB. The electrode that is donating electrons
C. The electrode with the higher reductive potential
OD. The electrode that is being oxidized
Answer:
The answer is the cathode. This electrode would get heavier in an electrolyte cell. This electrode would have the conventional current leaving then a polarize electrical device. A conventional current would be the one describing the direction where the electronic charges move.
Explanation:
aka... The electrode where reduction occurs.
Answer:
a. the electrode where reduction occurs
Explanation:
Divers get "the bends" if they come up too fast because the gas in their blood expands, forming bubbles in their blood. If a diver has 5.0 mL of gas in his blood under a pressure of 250. atm then rises instantaneously to a depth where his blood has a pressure of 50.0 atm, what will the volume of gas in his blood be?
Solve without converting volume into dm³ as it will led into same answer
According to Boyles law
P1V1=P2V25(250)=50V21250=50V_2V_2=25mLAccording to Boyle's law, the volume of gas in his blood will be 25 ml at constant temperature.
What is Boyle's law?
Boyle's law is an experimental gas law which describes how the pressure of the gas decreases as the volume increases. It's statement can be stated as, the absolute pressure which is exerted by a given mass of an ideal gas is inversely proportional to its volume provided temperature and amount of gas remains unchanged.
Mathematically, it can be stated as,
P∝1/V or PV=K. The equation states that the product of of pressure and volume is constant for a given mass of gas and the equation holds true as long as temperature is maintained constant.
According to the equation the unknown pressure and volume of any one gas can be determined if two gases are to be considered.That is,
P₁V₁=P₂V₂
substitution gives V₂=250×5/50=25 ml.
Therefore, the volume of gas in his blood will be 25 ml at constant temperature.
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11. (15 pts) Predict the products of the following DISPLACEMENT REACTIONS. Balance the
equation for any reactions that occur and include states of matter. If no precipitation reaction
occurs, write "No reaction." Write the complete reaction in the space below.
a. (6 pts) ZnSO, (aq) + BaCh (aq) ›
b. (9 pts) Write the balanced equation for the reaction between aqueous solutions of lithium
carbonate and cobalt(Il) acetate.
The displacement reactions produces insoluble precipitates of barium sulfate and cobalt carbonate retrospectively.
What are displacement reactions?Displacement reactions are reactions in which an atom of an element or radical removes and replaces another arim or radical in a substance.
The displacement reaction between zinc sulfate and barium chloride is given below:
[tex]ZnSO_4(aq) + BaCl_2(aq) \rightarrow ZnCl_2(aq) + BaSO_4(s) \\ [/tex]
The balanced equation for the displacement reaction between aqueous solutions of lithium carbonate and cobalt(Il) acetate is given below as follows:
[tex]Li_2CO_3(aq) + Co(C_2H_3O_2)_2(aq) \rightarrow 2C_2H_3LiO_2(aq) + CoCO_3(s) \\ [/tex]
Therefore, the displacement reactions produces insoluble precipitates of barium sulfate and cobalt carbonate retrospectively.
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Which statement best describes how light and lenses work together?
Do someone no the answer
Answer:
Answer A
Explanation:
When light enters a lense it bends and changes direction, and then does this again when it leaves. leaving the correct image in the center
A balloon is filled with 100.0 Lair at 1.300 atm pressure. what pressure is needed to change the volume to 25.00 L
Answer:
4 atmospheric pressure is needed to get a volume of 25 litres
Which of the molecules below is propyne? two carbons are double bonded to each other; the pair is single bonded to h above left, below left, and below right, and to c h 3 above right. two carbons are double bonded to each other; the pair is single bonded to c h 3 above left and right, and to h below left and right. an h is single bonded to c, which is triple bonded to another c, which in turn is single bonded to a c with h above and below and yet another c to the right; the final c is bonded to h above, below, and right. an h is single bonded to c, which is triple bonded to another c, which in turn is single bonded to a c which is bonded to h above, below, and right.
Propyne is is composed of only hydrogen and carbon. It is a hydrocarbon molecule.
What is propyneThe molecule propyne is hydrocarbon. This means that it is composed of only hydrogen and carbon. The molecule contains three carbon atoms and four hydrogen atoms as shown.
The structral formula that corretly reperesents the molecule called propyne is shown in the image attaced to this answer.
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Answer:
C.
Explanation:
A sample of methane occupies 3. 0 L at 200. C and 1. 4 ATM. What is the volume of the gas at STP?
Answer:
2.42 liters
Explanation:
P1V1/T1 = P2V2/T2 T 'S are in K
STP is 273.15 K and 1 atm
1.4(3) / 473.15 = (1) ( V) /273.15
V = 2.42 liters
An increase in blood carbon dioxide content causes hemoglobin to ________. release all bound carbon dioxide molecules bind more oxygen molecules bind more H release more oxygen molecules denature
An increase in blood carbon dioxide content causes hemoglobin to release more oxygen molecules. Details about hemoglobin can be found below.
What is hemoglobin?Hemoglobin is the iron-containing substance in red blood cells that transports oxygen from the lungs to the rest of the body.
Hemoglobin consists of a protein (globulin) and heme (a porphyrin ring with an atom of iron at its centre). This justifies its oxygen affinity.
However, excess carbon dioxide in the blood causes blood pH to decrease, resulting in hemoglobin proteins releasing more oxygen molecules.
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What is a large area of air with the same temperature?.
Sorry this is late but it would be the air mass
Hope this halpes :))
What is specific heat capacity?
Answer:
The energy needed to change the temp of a substance
Explanation:
Which is not a property of bases Group of answer choices react with metals to produce hydrogen gas react with acids to form a salt and water bitter taste slippery feel
Answer:
react with metals to produce hydrogen gas
Explanation:
NaOH is a common base and is a strong base. Look what happens with it reacts with a metal:
OH- (aq) + Li(s) --> LiOH. It forms a salt not H2
(I removed spectator ions)
Name the compound
i: (CH3)2CHCOOH
Answer:
methylpropanoic is your answer
Which animal feels no pain when they are exposed to acid?.
Researchers have found out why the African nak.ed mole-rat, one of the world's most unusual mammals, feels no pain when exposed to acid. The animals have an altered ion channel in their pain receptors that is inactivated by acid and makes the animals insensitive to this type of pain.
hope it helps...!!!
What is the most significant intermolecular force between water molecules?.
Answer:
cohesive force
Explanation:
Ba(C204) + K(IO3) = Ba(IO3)2 + K2(C2O4)
Explanation:Reaction Type
Double Displacement (Metathesis)
Net Ionic Equation
Ba(C2O4) + 2K(IO3) = Ba(IO3)2 + K2(C2O4) might be an ionic equation. Calculate the net ionic equation for Ba(C2O4)(s) + 2K(IO3)(aq) = Ba(IO3)2(aq) + K2(C2O4)(aq).