Answer:
The amount of energy that would be burnt in climbing stairs all day is approximately 52,738,560 Joules
Explanation:
The question is with regards to an experiment with details that can be obtained from the U Oregon website
The given parameters of the question are;
The energy consumed by a human each day = 2,500 kcal = 10,450,000 J
The required parameters obtained from U Oregon website are;
The average weight of a student, W ≈ 60 kg × 9.81 m/s² = 588.6 N
The average time it takes a student to run up a flight of stairs = 5.4 s
The height of the stairs, h = 0.2 m × 28 = 5.6 meters
Therefore, we get;
Work done in climbing up the stares = W × h = 588.6 N × 5.6 meters = 3,296.16 J
The height the student can climb in a day is given as follows;
The time of 1 day in seconds, t = 86,400 s
The height the student climbs in 5.4 s = 5.6 m
∴ Vertical velocity, [tex]v_y[/tex] = 5.6 m/(5.4 s) = (28/27) m/s
The vertical height the student climbs in a day, [tex]h_{(v \, all \, day)}[/tex] = [tex]v_y[/tex] × t
∴ [tex]h_{(v \, all \, day)}[/tex] = (28/27) m/s × 86,400 = 89,600 m
The work done all day = W × [tex]h_{(v \, all \, day)}[/tex] = 588.6 N × 89,600 m = 52,738,560 J
The amount of energy in joules that would be burnt in climbing stairs all day = The work done all day = 52,738,560 Joules
They have one electron in the outermost electron shell. These are very active metals and easily lose their single valence electron.
Answer: The statement they have one electron in the outermost electron shell. These are very active metals and easily lose their single valence electron, is true.
Explanation:
Metals are the species which tend to lose electron(s) to acquire stable noble gas configuration.
Elements which tend to lose a single electron in order to acquire stability are active in nature because losing one electron is more easy as compared to losing two or more electrons.
For example, atomic number of sodium is 11 and its electronic distribution is 2, 8, 1.
Since, it contains only one valence electron and by losing it sodium will acquire stability. Hence, sodium is a very reactive metal.
Thus, we can conclude that the statement they have one electron in the outermost electron shell. These are very active metals and easily lose their single valence electron, is true.
How many moles of acetylene are needed to completely react with 16.5g of CO2
Answer:
0.375 mols
Explanation:
Relative atomic mass Ar of C=12×1=12Relative atomic mass Ar of O=16×2=32Realitive formula mass Mr is 12+32=44mol:mass
1 : 44
x :16.5
cross multiply and get the answer
Please help me with this homework
Answer:
The answer is C density.
Please help!!
All fake answers get reported immediately. Yes, I am a girl -_-
Answer:
1.)C₃H₈O
2)OH
3.)1-propanol
1.) C4H8O
2.) C2H6O or CH3CH2OH
3.)Ethanol
Explanation:
Hope this help
3. How much heat (in joules) is needed to raise the temperature of 355 g of ethanol I
(c = 2.4 J/gºC) by 63°C?
q=mcAT
Answer:
53676 J
Explanation:
m = 355 g
c = 2.4 J/gºC
ΔT = 63°C
q = mcΔT
= (355)(2.4)(63)
= 53676 J
The amount of heat is 53676J to raise the temperature of 355 g of ethanol.
What is temperature?Temperature is a measurement of the amount of energy of the atoms in a system or a physical quantity that expresses hot and cold.
What is heat?Heat is energy that is transmitted through one body to some other due to a temperature differential. When two bodies of different temperatures come together, energy can be transferred (heat flows) from the hotter to the colder.
It can be determined by the formula:
q =mCΔT.
where, q is heat, m is mass , C is and T is temperature.
Calculation of heat is shown below:
It is given that, mass of ethanol = 355 g, c = [tex]2.4 J/g^{0}[/tex] C, ΔT. = [tex]63^{0} C[/tex]
Now, put the values of given data in heat formula:
q =mCΔT
= 355×2.4×63
=53676J.
Therefore, the amount of heat will be 53676J to raise the temperature of 355 g of ethanol
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Why are humans responsible for oil spills
Answer:
Oil spills into rivers, bays, and the ocean most often are caused by accidents involving tankers, barges, pipelines, refineries, drilling rigs, and storage facilities.
Spills can be caused by:
people making mistakes or being careless.
equipment breaking down.
natural disasters such as hurricanes.
deliberate acts by terrorists, countries at war, vandals, or illegal dumpers.
Explanation:
Hope this helped Mark BRAINLIEST!!!
What does temperature surround when the kinetic energy is moving fast ?
When the average kinetic energy of its particles increases, the object's thermal energy increases. Therefore, the thermal energy of an object increases as its temperature increases.
In chemistry, we define the temperature of a substance as the average kinetic energy of all the atoms or molecules of that substance. Not all of the particles of a substance have the same kinetic energy. At any given time, the kinetic energy of the particles can be represented by a distribution.
In physics, temperature is defined as the average kinetic energy of the particles in an object. ... When particles move more quickly, temperature is higher and an object feels warmer. When particles move more slowly, temperature is lower and an object feels cooler.
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What is the correct unit for M1 and M2?
Answer:
M1 and M2 are the masses of two. objects exerting the force on each other, and R is the distance. between their centers.
Explanation:
M1 and M2 are the masses of two. objects exerting the force on each other, and R is the distance. between their centers.
2). A student collects 425 L of oxygen at a temperature of 24.0°C and a pressure
of 0.899 atm. How many moles of oxygen did the student collect?
Answer:
15.5 moles
Explanation:
Applying,
PV = nRT.................. Equation 1
Where P = pressure, V = Volume, n = number of mole, R = molar gas constant, T = Temperature.
Make n the subject of the equation
n = PV/RT............... Equation 2
From the question,
Given: P = 0.899 atm, V = 425 L, T = 24 °C = (273+24) K = 297 K.
Constant: R = 0.083 L.atm/K.mol
Substitute these values into equation 2
n = (0.899×425)/(297×0.083)
n = 15.5 moles
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Answer:
ertyuioekgdctifrofy?
Explanation:
2. Identify the limiting reactant when 4.68 g of iron reacts with 2.88 g of sulfur to produce Fes.
Fe +
_Sg → FeS
B
C с
A
+
Help please I’ll mark brainliest
Answer:
Iron is limiting reactant
Explanation:
Based on the reaction:
Fe + S → FeS
1 mole of iron reacts per mole of Sulfur
To solve this question we must convert the mass of each reactant to moles using molar masses of each reactant. As the reaction is 1:1, the reactant with the lower amount of moles is limiting reactant.
Moles Fe -Molar mass: 55.845g/mol-
4.68g * (1mol / 55.845g) = 0.0838 moles
Moles S -Molar mass: 32.065g/mol-
2.88g * (1mol / 32.065g) = 0.0898 moles
As the amount of moles of Fe < Moles S,
Iron is limiting reactant
When 4.68 g of iron reacts with 2.88 g of sulfur to produce FeS, iron is the limiting reagent.
What is limiting reagent?
If in a chemical reaction two reactants are present and one of them is present in less quantity as compared to other, is known as limiting reagent.
Given chemical reaction is:
Fe + S → FeS
From the stoichiometry of the reaction it is clear that equal moles of both reactant is required for the formation of product, so their mole ratio is 1:1.
Now we calculate the moles by using the formula:
n = W/M, where
W = given mass
M = molar mass
Moles of 4.68g of iron = 4.68g / 55.845g/mole = 0.0838 moles
Moles of 2.88 of sulfur = 2.88g / 32.065g/mole = 0.0898 moles
Moles of iron is less as compare to the sulfur, so it is the limiting reagent.
Hence, iron is the limiting reagent.
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All of the following are empirical formulas except:
C2H3O2
C6H6
CHO2
CH2O
What molar concentration (molarity) results when 1.28 L of 14.38 M HCl is diluted to 9.45 L of water?
Answer:
1.95 M
Explanation:
Molarity is a measure of the molar concentration of a substance (solution). In relation to the volume, it is calculated using the formula as follows;
C1V1 = C2V2
Where;
C1 = initial concentration (M)
C2 = final concentration (M)
V1 = initial volume (L)
V2 = final volume (L)
According to the provided information in this question;
C1 = 14.38 M
C2 = ?
V1 = 1.28 L
V2 = 9.45 L
Using C1V1 = C2V2
14.38 × 1.28 = C2 × 9.45
18.4064 = 9.45 C2
C2 = 18.4064 ÷ 9.45
C2= 1.95 M
I NEED HELP FAST
Identify the charges that are negative
А
B
What is the volume occupied by 0.17 grams of gaseous H2S at 27◦C and 380 torr?
Answer:
0.25 liter
Explanation:
Trust
Perform an on-line search to find real-world uses for the titration process. State what you find below.
Answer:
The titration process has quite a few real-world uses, including key roles in the food industry and medical community. The titration process is essentially an analytical technique, as it is used to determine a chemical or physical property of a chemical substance, element, or mixture (such as food). Specifically in the food industry, it is used to allow food manufactuers to determine the quantity of a reactant in a sample. To provide an example, it can be used to find the specific amount of stuff that is usually labeled on the nutrition label, such as sugar, salt, protein, calcium, vitamin C, etc. As for the medical world, pharamcists typically use this process to get the proper mix when compounding medicines. It is used to get the necessary proportions in intravenous drips.
Mrs. Borunda has a sample of oxygen gas that occupies a volume of 600 L at 400 atm pressure. What will the pressure be if she increases the volume to
800 L?
300 atm
450 atm
540 atm
250 atm
Answer:
P₂ = 300 atm
Explanation:
Given that,
Initial volume, V₁ = 600 L
Initial pressure, P₁ = 400 atm
We need to find the pressure if the volume is 800 L.
We know that the relation between pressure and volume is given by :
[tex]P\propto \dfrac{1}{V}\\\\\dfrac{P_1}{P_2}=\dfrac{V_2}{V_1}\\\\P_2=\dfrac{P_1V_1}{V_2}\\\\P_2=\dfrac{600\times 400}{800}\\\\P_2=300\ atm[/tex]
So, the new pressure is equal to 300 atm.
0.225L solution of H2CO3 is neutralized by 0.0880L of a 1.22 M Fe(OH)3 solution. What
is the concentration of the H2CO3 solution?
Answer:
0.716
Explanation:
First, write the balanced equation:
3 H2CO3 + 2 Fe(OH)3 ----> Fe2(CO3)3 + 6 H2O
Second, go from the molarity of H2CO3 to liters of Fe(OH)3
(Pull mole ratio from balanced equation)
1.22/1L x 0.0880/1 x 3molH2CO3/2molFe(OH)3 x 1/0.225L
Use calculator, and you end up with 0.7157333
Round to 0.716
Past due! Help please I choose the middle picture for my hypothesis being inclusive can you help explain why and how it shows it’s being inclusive?
Answer:
Explanation:
its supposed to be not supported not inclusive because you said mix
Balance :FeCl3 + __Ca(OH)2 → ___ Fe(OH)3 + __ CaCl2
How does velocity affect the movement of an object?
Answer:
when the velocity is at a higher *rate of speed*, the faster the object will move!
Explanation:
(part 1 of 3) Copper reacts with silver nitrate through a single replacement. If 1.29 g of silver are produced from the reaction, how much copper(II) nitrate is also produced? Answer in units of mol. (part 2 of 3) How much Cu is required in this reaction? Answer in units of mol. (part 3 of 3) 1.0 points How much AgNO3 is required in this reaction? Answer in units of mol.
Answer:
See explanation.
Explanation:
Hello there!
In this case, according to the described chemical reaction, we first write the corresponding equation to obtain:
[tex]Cu+2AgNO_3\rightarrow 2Ag+Cu(NO_3)_2[/tex]
Thus, we proceed as follows:
Part 1 of 3: here, since the molar mass of silver and copper (II) nitrate are 107.87 and 187.55 g/mol respectively, and the mole ratio of the former to the latter is 2:1, we can set up the following stoichiometric expression:
[tex]m_{Cu(NO_3)_2}=1.29gAg*\frac{1molAg}{107.87gAg}*\frac{1molCu(NO_3)_2}{2molAg}*\frac{187.55gCu(NO_3)_2}{1molCu(NO_3)_2} \\\\m_{Cu(NO_3)_2}=1.12gCu(NO_3)_2[/tex]
Part 2 of 3: here, the molar mass of copper is 63.55 g/mol and the mole ratio of silver to copper is 2:1, the mass of the former that was used to start the reaction was:
[tex]m_{Cu}=1.29gAg*\frac{1molAg}{107.87gAg}*\frac{1molCu}{2molAg}*\frac{63.55gCu)_2}{1molCu} \\\\m_{Cu}=0.380gCu[/tex]
Part 3 of 3: here, the molar mass of silver nitrate is 169.87 g/mol and their mole ratio 2:2, thus, the mass of initial silver nitrate is:
[tex]m_{AgNO_3}=1.29gAg*\frac{1molAg}{107.87gAg}*\frac{2molAgNO_3}{2molAg}*\frac{169.87gAgNO_3}{1molAgNO_3} \\\\m_{AgNO_3}=2.03gAgNO_3[/tex]
Best regards!
When writing the formulas for a compound that contains a polyatomic ion, ... ?
Answer:
The cation is written first in the name; the anion is written second in the name. Rule 2. When the formula unit contains two or more of the same polyatomic ion, that ion is written in parentheses with the subscript written outside the parentheses.
When writing the formula of a compound that contains polyatomic ion, the metal is written first followed by the central atom in the ion and then other atoms that surround the central atom.
A poly atomic ion refers to an ion that comprises of more than one atom. Such ions are common in chemistry. Examples of polyatomic ions include; PO4^3-, BH4^- etc.
When writing the formula of a compound that contains a polyatomic ion, the metal is written first then the central atom in the ion follows before other atoms that surround the central atom in the ion.
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PLEASE HELP!
an element with 8 protons and 10 neutrons
Answer:
oxygen ion O2-
Explanation:
because it has 8 protons and gave gained 2 electron so O2-.
DIRECTIONS: Classify the following unbalanced chemical equations according to the six types
of chemical reactions. Write your answer on the space provided for each number.
1. NaOH + KNO3 NaNO3 + KOH
2. CH4 + O2 CO2 + 2H2O
3. Fe + NaBr FeBr3 + Na
4. CaSO4 + Mg(OH)2 Ca(OH)2 + MgSO4
5. NH4OH + HBr H2O + NH4Br
6. P4 + O2 P2O4
7. NaNO3 NaNO2 + O2
8. C18H18 + O2 CO2 + H2O
9. H2SO4 + NaOH NaSO4 +H2O
10.NiSO4 + Li3PO4 Ni3(PO4)2 + Li2SO4
Which results in a chemical change?
A. A teacher feels a rough cloth
B. A student colors a blue paper
C. A student smells a flower
D. A teacher lights a candle
Answer:
D. I am pretty sure
Explanation:
:))))))
Answer:
D. A teacher lights a candle
Explanation:
Which formula represents an isomer of this compound?
Answer:
Explanation:
I can’t explain but this is the answer LOL
What is the molarity of a 9.13 L soda that contains 13.83 of sugar?
Answer:
1.52 M
Explanation:
Molarity of a solution is calculated as follows:
Molarity = number of moles (n) ÷ volume (V)
Based on the information given in this question,
Volume of soda (V) = 9.13 L
number of moles = 13.83 mol
Molarity = 13.83 ÷ 9.13
Molarity = 1.52 M
Select the correct answer.
In an isolated system, two copper bars at different temperatures transfer energy until both are at the same temperature. How would the
transfer of energy be different if the bars were in an open system?
O A. Energy transfer would occur only between the copper bars.
OB. Energy transfer would occur between the copper bars and the surroundings.
Ос. No energy transfer would occur between the copper bars or the surroundings.
OD. Energy transfer would occur only with the surroundings.
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San ou
Answer:
OB. Energy transfer would occur between the copper bars and the surroundings.
Explanation:
We define an isolated system as a system in which there is neither exchange of material nor energy while an open system is one in which materials and energy can be exchanged with the environment.
Given an open system consisting of two copper bars at different temperatures, energy will not only be exchanged between the copper bars but also between the copper bars and the environment.
The decomposition of potassium chlorate, KClO3, is used as a source of oxygen in labs.
How many moles of potassium chlorate are needed to produce 6.83 moles of oxygen gas?
Reaction takes place is
2KClO3 --> 2KCl + 3O2
from above equation 2 moles of potassium chlorate is forming 3 moles of Oxygen gas.
now given 6.83 moles of oxygen and moles of potassium chlorate is missing,
consider x moles of potassium chlorate are needed to form 6.83 moles of oxygen
from above condition, .
3 》》》》2
x 》》》》6.83
3/x = 2/6.83
x = 3×6.83/2
x= 10.245
Answer- 10.245 moles of potassium chlorate are needed to produce 6.83 moles of oxygen gas.