Answers
Answer:
The final temperature aluminium-water system is 24° C
Explanation:
Heat energy, H = mcθ
Where m is mass of substance, c is specific heat capacity, θ is temperature difference
Using the principle, Heat lost = Heat gained
Let the final temperature of the aluminium-water system be Tfinal
Heat lost by aluminium, H₁ = -m₁c₁(Tfinal - 40)
Heat gained by water, H₂ = m₂c₂(Tfinal -21)
Heat lost by aluminium, H = -[30 × 0.21 × (Tfinal - 40)]
H₁ = -6.3Tfinal + 252
Heat gained by water, H₂ = 50 × 1.0 × (Tfinal - 21)
H₂ = 5Tfinal - 21
Equating H₁ and H₂
-6.3Tfinal + 252 = 5 Tfinal - 21
5Tfinal + 6.3Ffinal = 252 + 21
11.3 Tfinal = 273
Tfinal = 273/11.3
Tfinal = 24° C
Therefore, the final temperature aluminium-water system is 24° C
Related Questions
Teniendo en cuenta la siguiente reacción quimica: Mn (NO3)2 + NaBiO; + HNO, HMnO₂+ Bi (NO3)3 + NaNO3 + H₂O ¿Cuánto Bi (NO₂), se obtiene a partir de 650 g de Mn (NO₂)2 y 700 g de NaBiO, si la eficiencia del proceso es de un 80%?
Answers
Answer:
La masa de Bi (NO₃) ₃ producida es de aproximadamente 2.117,09 gramos
Explanation:
La ecuación química de la reacción se presenta como sigue;
2Mn (NO₃) ₂ + 5NaBiO₃ + 14HNO₃ → 2HMnO₄ + 5Bi (NO₃) ₃ + 5NaNO₃ + 7H₂O
La masa dada de Mn (NO₃) ₂ = 650 g
La masa de NaBiO₃ = 750 g
El número de moles de Mn (NO₃) ₂ = 650 g / (178.95 g / mol) ≈ 3.63 moles
El número de moles de NaBiO₃ = 750 g / (279.968 g / mol) ≈ 2.68 moles
Por lo tanto, el NaBiO₃, es el reactivo limitante, y el rendimiento teórico de Bi (NO₃) ₃ ≈ 5/2 × 2.68 = 6.7 moles
Dado que la eficiencia del proceso es del 80%, el rendimiento real de Bi (NO₃) ₃ = 0,8 × 6,7 moles = 5,36 moles de Bi (NO₃) ₃
La masa molar de Bi (NO₃) ₃ ≈ 394,98 g / mol
La masa de Bi (NO₃) ₃ = 394,98 g / mol × 5,36 moles ≈ 2,117,09 g
La masa de Bi (NO₃) ₃ produjo ≈ 2,117.09 g
If 3.02 g of CuNO3 is dissolved in water to make a 0.560 M solution, what is the volume of the solution in milliliters?
Answers
Answer: The volume of the solution is 28.75 mL
Explanation:
Molarity is defined as the amount of solute expressed in the number of moles present per liter of solution. The units of molarity are mol/L. The formula used to calculate molarity:
[tex]\text{Molarity of solution}=\frac{\text{Given mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution (mL)}}[/tex] .....(1)
Given values:
Molarity of copper nitrate = 0.560 M
Given mass of copper nitrate = 3.02 g
Molar mass of copper nitrate = 187.56 g/mol
Putting values in equation 1, we get:
[tex]0.560=\frac{3.02\times 1000}{187.56\times \text{Volume of solution}}\\\\\text{Volume of solution}=\frac{3.02\times 1000}{187.56\times 0.560}=28.75mL[/tex]
Hence, the volume of the solution is 28.75 mL
what is the formula for number of moles?
Answers
Answer:
number of moles=volume/molar volume or mass/molar mass
Answer : The formula for the number of moles formula is expressed as
Number of moles = Mass of substance / Mass of one mole
A mole is defined as the mass of the substance which consists of the equal quantity of basic units. Example atoms in 12 grams are the same as 12C. The basic units can be molecules, atoms or formula units based on the substance.
A mole fraction indicates the number of chemical elements. One mole of any substance is equal to the value of 6.023 x 1023 (Avagadro number). It can be used to measure the products obtained from the chemical reaction. The unit is denoted by mol.
Tea contains which acid?
A
Tannic acid
B
Tartaric acid
C
Carbonic acid
D
Citric acid
Answers
Which statement best summarizes what happens during cellular respiration?
A. Energy in food is released and stored in ATP molecules.
B. Energy from sunlight moves through a food web.
C. Chemical energy is converted to kinetic energy.
D. Solar energy is converted and stored in chemical bonds.
Answers
Answer:
A
Explanation:
B is for photosynthesis, C and D are just energy conversions, A is all about producing energy and stored as Adenosine Triphosphate(ATP) which is respiration
Solve for a, b, c, AND d
d
C
84°
930
970
b
Answers
B is 83
C is 96
D is 94
You can simply subtract the given degree from 180
And for D you should subtract the sum of given degree from 360 and do as above
0.30 kg cart moves on an air track at 1.2 m/s.It collides with and sticks to another cart of mass 500 g,which was stationary before collision. What is the velocity of the combined carts after collision?
Answers
give few property of PET
Answers
Answer:
Transparency to visible light and microwaves. Very good resistance to ageing, wear and heat. Lightweight, impact and shatter resistant. Good gas and moisture barrier properties
Explanation:
Answer:
Your Welcome! :)
Explanation:
What are the Characteristics of Polyethylene terephthalate (PETE or PET)?
Chemical Resistance: PET does not react with water or food which is one of the reasons it is used for consumable packaging.
Strength to Weight Ratio: PET is very strong for its lightweight.
Shatterproof: PET will not break or fracture.
How do I solve for a and b using the Van Der Waals equation using only the given values: P= 1 atm, V= 1.310 L, and T= 160 K
Answers
Answer:
[tex]a = \frac{24.79078- 1.7161b}{1.310 - b}[/tex]
[tex]b = 1.310 - \frac{22.5427}{a - 1.7161}[/tex]
Explanation:
Given
[tex]P = 1\ atm[/tex]
[tex]V = 1.310\ L[/tex]
[tex]T =160\ K[/tex]
Required
Solve for a and b
Van Der Waals equation is:
[tex]P = \frac{RT}{V - b} - \frac{a}{V^2}[/tex]
Substitute values for P, V and T, we have:
[tex]1 = \frac{R*160}{1.310 - b} - \frac{a}{1.310^2}[/tex]
R is a constant and the value is:
[tex]R = 0.0821[/tex]
So, the equation becomes:
[tex]1 = \frac{0.0821*160}{1.310 - b} - \frac{a}{1.310^2}[/tex]
Simplify the expression
[tex]1 = \frac{13.136}{1.310 - b} - \frac{a}{1.7161}[/tex] ----- (a)
Solving for (a):
[tex]1 + \frac{13.136}{1.310 - b} = \frac{a}{1.7161}[/tex]
Multiply both sides by 1.7161
[tex]a = [1 + \frac{13.136}{1.310 - b}] * 1.7161[/tex]
Take LCM
[tex]a = [\frac{1.310 - b+13.136}{1.310 - b}] * 1.7161[/tex]
Evaluate like terms
[tex]a = [\frac{14.446- b}{1.310 - b}] * 1.7161[/tex]
Open bracket
[tex]a = [\frac{24.79078- 1.7161b}{1.310 - b}[/tex]
Solving for (b), we have:
[tex]1 + \frac{13.136}{1.310 - b} = \frac{a}{1.7161}[/tex]
Subtract 1 from both sides
[tex]\frac{13.136}{1.310 - b} = \frac{a}{1.7161}-1[/tex]
Take LCM
[tex]\frac{13.136}{1.310 - b} = \frac{a-1.7161}{1.7161}[/tex]
Inverse both sides
[tex]\frac{1.310 - b}{13.136} = \frac{1.7161}{a - 1.7161}[/tex]
Multiply both sides by 13.136
[tex]1.310 - b = 13.136 * \frac{1.7161}{a - 1.7161}[/tex]
[tex]1.310 - b = \frac{22.5427}{a - 1.7161}[/tex]
Collect like terms
[tex]b = 1.310 - \frac{22.5427}{a - 1.7161}[/tex]
Which statement best describes wave-particle duality as it applies to electrons?
A. The electrons present in radio waves and microwaves act more like particles than waves.
B. Electrons are particles that emit waves of radiation when they move from higher energy levels to lower energy levels.
с.Electron clouds can be understood as clumps of particles held near one another by wave forces.
D.Electrons can be modeled as waves in some situations and as particles in other situations.
Answers
Answer:
D es pero que te ayude amigo
The expression below was formed by combining different gas laws. V is proportional to StartFraction n T over P EndFraction. Which law was used to determine the relationship between the volume and the number of moles in this equation?
Answers
Answer:
The Ideal gas law
Explanation:
From the given question, we have:
V [tex]\alpha[/tex] [tex]\frac{nT}{P}[/tex]
where each variable has its usual meaning.
Thus,
V = [tex]\frac{nRT}{P}[/tex]
where R is the ideal gas constant
cross multiply to have;
PV = nRT
This implies that the volume of the gas is directly proportional to the number of moles of the gas.
Therefore, the law can be used to determine the relationship between the volume and number of moles is the ideal gas law.
a shiny brown colured metal onhaeting in air becomes black in colour when hydrogen gas is passed over the black substance it regain its original colour a]what type of chemical reaction takes place in each of the two given steps
Answers
Oxidation reaction
Hope this helps! :)
Read the following reactions. Reaction 1: CaO(s) + CO2(g) → CaCO3(s) Reaction 2: H2O(g) → H2O(l) Which reaction leads to an increase in entropy? Only Reaction 1 Only Reaction 2 Both Reaction 1 and 2 Neither Reaction 1 nor 2
Answers
Answer: In the given reactions neither reaction 1 nor 2 reaction leads to an increase in entropy.
Explanation:
The degree of randomness present in the molecules of a substance is called entropy.
In gases, molecules are held by weak forces due to which they move apart from each other. Hence, they have high entropy.
In liquids, molecules are a little close to each other so they have less entropy than gases.
In solids, molecules are tightly held together so they have least or negligible entropy.
As reaction 1 is [tex]CaO(s) + CO_{2}(g) \rightarrow CaCO_{3}(s)[/tex] and it shows that product is in solid state. Therefore, entropy is decreasing.
As reaction 2 is [tex]H_{2}O(g) \rightarrow H_{2}O(l)[/tex] and it shows that gas is converted into liquid. Therefore, entropy is also decreasing here.
Thus, we can conclude that in the given reactions neither reaction 1 nor 2 reaction leads to an increase in entropy.
Answer: Neither Reaction 1 nor 2
Explanation:
When does the electron shown release the greatest amount of energy as it moves from one level to another
Answers
Answer:
s1 to GS as the amount of energy required to remove the electron is greatest when it is closest to the nucleus.
Explanation:
Fun facts:
When the electron changes levels, it decreases energy and the atom emits photons. The photon is emitted with the electron moving from a higher energy level to a lower energy level. The energy of the photon is the exact energy that is lost by the electron moving to its lower energy level.
Answer:
The answer is: S.1 to G.S
Hope this helpss :) <3
Explanation:
An atom has an atomic number of 19 and mass number of 39 how many electrons and protons does it have?
Answers
Answer:
19 protons, 20 neutrons and 18 electrons.
Explanation:
The atomic number gives the number of protons 19
p = 19
The atomic mass is the sum of the protons and neutrons
p + n = 39 p = 19
put p into the equation and solve for n the neutrons.
19 + n = 39
Subtract 19 from both sides
19 − 19 + n = 39 − 19
n = 20
The number of electrons equals the number of protons in a neutral atom. The positive charge equals the negative charge. The negative charge is the number of electrons. This ion has a charge of +1. So solve for the negative charge.
− 19 + 1 = − 18
The negative charge is -18 so
e = 18
in which of the following type of colloid, the physical state of dispersed phase and dispersion medium is same?
Gel
Foam
Emulsion
Aerosol
Answers
Answer:
Emulsion
Explanation:
According to Oxford dictionary, a colloid is, ''a homogeneous non-crystalline substance consisting of large molecules or ultramicroscopic particles of one substance dispersed through a second substance. Colloids include gels, sols, and emulsions; the particles do not settle, and cannot be separated out by ordinary filtering or centrifuging like those in a suspension.''
An emulsion is a dispersion of a liquid in a liquid. This means that the the physical state of dispersed phase and dispersion medium is same.
Examples of emulsions include; Vinaigrette, homogenized milk and hair cream.
The frequency of an X ray is 6.5 x 1018 Hz. What is the X ray’s wavelength? .
Answers
Answer:
The X ray’s wavelength is 4.61*10⁻¹¹ m
Explanation:
Wavelength is the minimum distance between two successive points on the wave that are in the same state of vibration. It is expressed in units of length (m).
Frequency is the number of vibrations that occur in a unit of time. Its unit is s⁻¹ or hertz (Hz).
The propagation speed is the speed with which the wave propagates in the medium, that is, it is the magnitude that measures the speed at which the wave's disturbance propagates along its displacement. Relate the wavelength (λ) and the frequency (f) inversely proportional using the following equation:
v = f * λ.
In this case:
The frecuency f= 6.5*10¹⁸ Hz The speed v=c= 3*10⁸ [tex]\frac{m}{s}[/tex]Replacing:
3*10⁸ [tex]\frac{m}{s}[/tex]= 6.5*10¹⁸ Hz* λ
Solving:
[tex]wavelength= \frac{3*10^{8} \frac{m}{s} }{6.5*10^{18} Hz}[/tex]
λ= 4.61*10⁻¹¹ m
The X ray’s wavelength is 4.61*10⁻¹¹ m
definition of boiling point
Answers
Answer:
boiling point, temperature at which the pressure exerted by the surroundings upon a liquid is equaled by the pressure exerted by the vapour of the liquid; under this condition, addition of heat results in the transformation of the liquid into its vapour without raising the temperature.
Explanation:
Radhe Radhe❤
Explanation:
The point at which a matter melts is called boiling or melting point.
Roundup, a herbicide manufactured by Monsanto, has the formula C3H8NO5P. How many moles of molecules are there in a 647.3-g sample of Roundup?
I got the answer 2.305 x 10^24 but for some reason it’s not working. Is it the wrong one?
Answers
Answer:
3.830177515 moles
Explanation:
You have :
647.3 g of RoundupMolar mass of Round up which is equal to 169 g.moland the formula: n=m/MTherefore: n=647.3/169
=3.830177515 moles
How much energy does a 930 nm wave of light have? (The speed of light in a vacuum is 3.00 x 108 m/s, and Planck's constant is 6.626 x 10-34 J·s.)
A. 4.68 x 10^18 J
B. 2.14 x 10^-19 J
C. 1.85 x 10^-31 J
D. 4.21 x 10^35 J
Answers
Answer:
B. 2.14 x 10^-19 J
Explanation:
The energy of a wave of light can be obtained using the equation:
E = h*c/λ
Where E is the energy in joules,
λ is wavelength = 930nm = 930x10⁻⁹m
h = Planck's constant = 6.626x10⁻³⁴Js
c = Speed of light = 3.00x10⁸m/s
Replacing:
E = 6.626x10⁻³⁴Js*3.00x10⁸m/s/930x10⁻⁹m
E = 2.14x10⁻¹⁹J
Right option is:
B. 2.14 x 10^-19 J
SOMONE HELP DUE IN 5 MINUTES
Answers
Answer:
Silicon
Explanation:
Nucleus
14 protons
Group 14
Number 14
+4, +2, or -4
Answer:
Explanation:
Name of the part of this atom labeled z is nucleus.
number of protons is 14 .
the given element is silicion and it lies in group 14.
the no of period that contains this element is 3.
charge formed on the ion formed from this atom is positive charge because it gives 4 electron to other element .
If the element gains the electron then it has negative charge where as when it loses it will have positive charge.
Identify the atom oxidized, the atom reduced, the oxidizing agent, and the reducing agent.
SO2+ 2H2S----> 3S + 2H2O
Answers
Explanation:
here is the answer bae. Feel free to ask for more chem help
Which are the fundamental particles whose masses are mainly responsible for the mass of an atom?Give Reason
No links
Answers
Answer:
Proton & neutron
Explanation:
electrons only affect the charge. neutrons affect the mass and stability of an atom.
What does Seltzer Water have in common with Limestone ?
Answers
If a tornado causes considerable damage with wind speeds of 111 to 135 miles per hour, it’s classified as _______ on the Enhanced Fujita Scale.
The type of major storm called a/an _______ is driven primarily by the Coriolis effect.
The weather pattern that stays over one area for an extended period of time is known as _______.
What are the two types of downbursts, and how are they different?
How is a funnel cloud different from a tornado?
Why does a hurricane begin to dissipate after it makes landfall?
Explain how the heat index and the wind chill index are similar and different.
What type of severe weather prevents sweat from evaporating to cool down bodies?
Answers
Answer:
EF-2
hurricane/tropical cyclone
recurrent weather
The two types of downbursts are macrobursts and microbursts. A macroburst affects an area that's greater than 2.5 miles across. A microburst affects an area that's less than 2.5 miles across.
A funnel cloud forms as a spinning column of air that descends from a thundercloud. However, a funnel cloud doesn't become a tornado until it actually touches the ground. Once it touches the ground, where it begins to pick up dust and debris, it becomes a tornado.
Tropical cyclones, such as hurricanes, are fueled by warm ocean waters. Once they make landfall, they lose this fuel source and begin to lose strength.
The heat index and the wind chill index are similar because both consider other factors that affect how air temperature feels. The heat index considers relative humidity in relation to air temperature. Higher humidity makes air temperatures feel hotter. The wind chill index considers wind speed in relation to air temperature. Higher wind speeds make air temperatures feel colder.
Heat waves—Heat waves can be very dangerous when accompanied by high humidity. The human body depends on evaporation of sweat to cool itself down on hot days. When humidity levels are high, the rate of evaporation slows down. Consequently, it becomes harder for the body to cool itself and much easier for the body to overheat.
Explanation:
took the testoronee
Helppppp plz ASAP DON’T GUESS
Answers
Explanation:
A B C D isme koyi ans hain doond lo
Some one help me with these real quick I need help with questions 4 & 6.!
Answers
Answer:
4 is chemical and 6 is a
Explanation:
hope this helps
The student is now told that the four solids, in no particular order, are aluminum chloride (AlCl3AlCl3), sugar (C6H12O6C6H12O6), butanoic acid (C3H7COOHC3H7COOH), and potassium bromide (KBrKBr), and potassium bromide (KBr). Assuming that conductivity is correlated to the number of ions in solution, rank the four substances based on how well a 0.20 M solution in water will conduct electricity. Rank from most conductive to least conductive. To rank items as equivalent, overlap them.
Answers
Answer:
aluminum chloride> potassium bromide> butanoic acid> sugar
Explanation:
Conductivity has to do with the ability of a solid to dissolve in solution leading to the formation of mobile ions which are the charge carriers in solution.
Strong electrolytes produce more ions in solution hence they have a higher conductivity.
Aluminum chloride produces four particles in solution hence it has the highest conductivity followed by potassium bromide which produces two particles in solution. Butanoic acid is a weak electrolyte which dissociates only to a small extent while sugar is a nonelectrolyte, it does not dissociate at all in solution.
Draw the structure formula of 2methylbutanoate
Answers
Answer:
[tex]CH _{3}CH(CH _{3})CH _{2}COO {}^{ - } \\ \\ [/tex]
CHEM FINAL PLEASE HELP
This is?
alkene
aromatic hydrocarbon
alkyne
alkane
Answers
Answer:
It is alkyne
Explanation: