Answer:
The amount of heat that is released is -925.2 cal
Explanation:
Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is the amount of heat that a body can receive or release without affecting its molecular structure, that is, it does not change the state (solid, liquid, gaseous). In other words, sensible heat is the amount of heat that a body absorbs or releases without any changes in its physical state.
The equation that allows to calculate heat exchanges is:
Q = c * m * ΔT
Where Q is the heat exchanged by a body of mass m, constituted by a substance of specific heat c and where ΔT is the variation in temperature.
In this case:
c= 1 [tex]\frac{cal}{g*C}[/tex]m= 25.7 gΔT= Tfinal - Tinitial= 49 °C - 85 °C= -36 °CReplacing:
Q= 1 [tex]\frac{cal}{g*C}[/tex] *25.7 g* (-36 C)
Solving:
Q= -925.2 cal
The amount of heat that is released is -925.2 cal
If 100. mL of 0.100 M K2SO4 is added to 200. mL of 0.150 M KCl, what is the concentration of K + ions in the final solution? Assume that the volumes are additive.
The final concentration will be "0.167 M".
According to the question,
Moles of KCl,
[tex]0.15\times 200\times 10^{-3}[/tex]Moles of K₂SO₄,
[tex]0.1\times 100\times 10^{-3}[/tex]Total moles of K+ will be:
= [tex]0.15\times 200\times 10^{-3}+2\times 0.1\times 100\times 10^{-3}[/tex]
Total volume will be:
= [tex](100+200) \ mL[/tex]
hence,
→ The final concentration of K+ will be:
= [tex]\frac{Total \ moles}{Total \ volume}[/tex]
= [tex]\frac{0.05}{300}\times 100[/tex]
= [tex]\frac{0.5}{3}[/tex]
= [tex]0.167 \ M[/tex]
Thus the above solution is correct.
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helppppppppppppppppppppppppppppppppppppppppppppppppppp
Answer:
C hydrogen and orange boxes element
Explanation:
hurry plaese big points brainliest
Answer:
No because a straw is plastic look at it by this was, the energy used to create one metal straw is roughly equivalent to creating 90 plastic straws, and also produces carbon emissions equivalent to 150 plastic straws. This may not seem like a lot, but in order to offset the environmental impact of creating a metal straw, it must be used over 150 times
Explanation:
2H2O(l)2H2(g) O2(g) Using standard thermodynamic data at 298K, calculate the entropy change for the surroundings when 2.03 moles of H2O(l) react at standard conditions.
Answer:
The correct answer is -1946.89 j/K.
Explanation:
The reaction is:
2H2O (l) ⇔ 2H2 (g) + O2(g)
First there is a need to find dHfrxn = dHf(Products) - dHf(reactants)
With the help of standard thermodynamic table, the values of dHf can be obtained,
dHf(H2O) = -285.8 kJ/mol
dHf(H2) = 0 kJ/mol
dHf(O2) = 0 kJ/mol
dHrxn = 2 × dHf (H2) + dHf(O2) - 2 × dHf(H2O)
= 2 × 0 + 0-2 × (-285.8) kJ = +571.6 kJ
This value is for 2 moles of H2O, for 2.03 moles of H2O, the value will be,
dHrxn = +571.6 kJ/2 mol × 2.03 mol
= 580.174 kJ
The given temperature is 298 K.
So, the value of dSsurr = -dHrxn/T
= -580.174kJ/298 K
= -580174 j/298K
= -1946.89 j/K
Is my answer correct?
Can someone explain how to get the right net ionic equation
Answer:
Option D.
2Ag⁺(aq) + Ni(s) —> 2Ag(s) + Ni²⁺(aq)
Explanation:
From the question given above:
Ni(s) —> Ni²⁺(aq) + 2e¯
Ag⁺(aq) + e¯ —> Ag(s)
We can obtain the net ionic equation by combining both equation as shown below:
Ag⁺(aq) + e¯ + Ni(s) —> Ag(s) + Ni²⁺(aq) + 2e¯
Next, we shall balance the equation. This can be obtained as follow:
Ag⁺(aq) + e¯ + Ni(s) —> Ag(s) + Ni²⁺(aq) + 2e¯
There are 2 atoms of e¯ on the right side and 1 atom on the left side. It can be balance by putting 2 in front of e¯ as shown below:
Ag⁺(aq) + 2e¯ + Ni(s) —> Ag(s) + Ni²⁺(aq) + 2e¯
Next, we shall balance the charge on both sides. This is illustrated below:
TOTAL charge on the left = +1 + (–2)
= 1 – 2
= –1
TOTAL charge on the right side = +2 + (–2)
= 2 – 2
= 0
Thus, to balance the charge, put 2 in front of Ag⁺ as shown below:
2Ag⁺(aq) + 2e¯ + Ni(s) —> Ag(s) + Ni²⁺(aq) + 2e¯
There are 2 atoms of Ag on the left side and 1 atom on the right side. It can be balance by putting 2 in front of Ag as shown below:
2Ag⁺(aq) + 2e¯ + Ni(s) —> 2Ag(s) + Ni²⁺(aq) + 2e¯
Next, cancel out 2e¯ from both side to obtain the net ionic equation. Thus, we have:
2Ag⁺(aq) + Ni(s) —> 2Ag(s) + Ni²⁺(aq)
8.67 x 1018 atoms Zn
calculate the number of representative particles or moles for each of the following
Multiply the no. of moles with Avogadro's constant which is 6.02*10^23
the mole ratio of Zinc * Avogadro's constant *8.67*1018
this should help you get what you want
You are asked to make a buffer solution with a pH of 10 (ignore temperature effects), with a final concentration of 0.1 M in 1.0L total volume. You are asked to use carbonic acid (H2CO3; MW = 62 g/mole) to make this buffer solution. The reported values for carbonic acid are pKa1 = 6.4 and pKa2 = 10.3. To make this solution you will first dissolve the acid in 800 mL of distilled water, then add a volume of 10 M NaOH, followed by additional distilled water to bring the volume up to 1.0L. Address the following:
A) How much carbonic acid do you add to make your desired solution (in grams)?
B) How much 10M NaOH do you add to obtain the desired pH?
C) Wait a minute, what if instead you are provided with a 0.2 M solution of NaHCO3 and 0.4 M solution of Na2CO3…then how would you make the solution? It should be the same pka values as carbonic acid.
D) Turns out you can only get the amino acid lysine (in acid form, fully protonated). Perform the same calculations for (A) and (B) using this molecule (how much to add, how much 10 M NaOH to add). I believe you can use any of the pka's that Lysine has, just use 2.
E) If you overshoot regarding the pH, that is say it’s at pH 11 vs. 10, then can you just add some HCl to bring the pH down or should you start all over? Why?
Consider a solution containing 10−5 M H2S(aq) and a constant dissolved oxygen concentration of 0.25 mM (8.0 mg/L). If the given reaction is the only way that 100 temperature.
What is temperature ?Temperature is a numerical expression of how hot (or energetic) stuff or radiation is.
There are three different types of temperature scales: those, like the SI scale, that are defined in terms of the average translational kinetic energy per freely moving microscopic particle, like an atom, molecule, or electron, in a body; those that only depend on strictly macroscopic properties and thermodynamic principles, like Kelvin's original definition; and those that are defined by practical empirical properties of particulates rather than by theoretical principles.
Using a thermometer, one can gauge temperature. It is calibrated using different temperature scales, each of which historically defined itself using a different set of reference points and thermometric materials.
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Which of the following is the last part of the technological design process
Answer:
Communicate the final solution
This concludes the Technological Design Process.
What purpose is served by
including information about Aristotle
and the experiments of the ancient
Greeks?
Aristotle laid the philosophical groundwork for all subsequent discussions of elements, pure substances, and chemical combinations.
The nature of substances and their transformations were the main topics of Aristotle's theories, just like in contemporary chemistry. In On Generation and Corruption (De Generatione et Corruptione), Meteorology, and portions of Physics and On the Heavens, he provided the first systematic treatments of chemical theory (De Caelo).
Although he believed that some of them might be made of a single, pure component, Aristotle realized that the majority of common, tangible things are composed of several different substances. In order to identify a single substance, he needed to provide a purity standard. His standard was the homoeomerism of pure substances, which means that they are made up of similar components at all levels.
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In the reaction __S+3O2->2SO3 what coefficient should be placed in front of the S
to balance the reaction?
1
2
3
Answer:
i think 3
Explanation:
Answer:
Your answer Should be 2
Explanation:
because i need to flex my brain cells
can someone help me?
Answer:
Heating water until it boils. The water particles would gain thermal energy from the heat source and there would be an increase in the kinetic energy between the water particles. During this stage, the temperature of the water particles remains the same as the thermal energy is used to break the strong bonds of attraction between the water particles so that they can be further apart and transition from the liquid state to the gas state.
1)What is the current in a 160V circuit if the resistance is 5Ω?
Answer:
Current 32 A
Explanation:
Use this formula
I=V/R
V = Voltage (volts)
R = resistance (ohms)
160/5=32
Hope this helps
1. Calculate the amount of heat, in kJ, that is transferred to 45.7 mL of water when its temperature changes from 23.6 °C to 41.3 °C. The density of water is 1.00 g/mL and the specific heat of water is 4.184 J/(g•°C).
2. Should the sign of the heat transferred in the question above be positive or negative?
Answer:
from
H=mc∆T
where by;
H is amount of heat.
m is mass of water.
c is specific heat of water.
∆T is change in temperature.
m=density ×volume
m=1.00g/ml×45.7ml
m=45.7g
∆T=Tt-T°
∆T=41.3°C-23.6°C
∆T=17.7°C
H=45.7g×4.184j(g•°C)×17.7°C
H=3,384.396J
H=3,384.396÷1000
H=3.384kJ
Explanation:
H=mc∆T
where by;
H is amount of heat.
m is mass of water.
c is specific heat of water.
∆T is change in temperature
Describe the three main types of plate boundary interactions:
Divergent boundaries:
Convergent boundaries:
Transform boundaries:
Answer:
In the explanation
Explanation:
Divergent: When two plates are diverging from each other, meaning that the two plates are moving away from each other. Events that may occur include ridges or rifts.
Convergent: When two plates are moving towards each other.
If a continental plate and an oceanic plate are converging, the oceanic plate would slide underneath the continental plate since it is thinner. This would result in subduction, which means that part of the oceanic plate would hang underneath the continental plate, where magma can melt the hanging part.
If two continental plates are converging, the crash would result in mountains or volcanic activity. Magma could rise and rush from the crack. There would be a bump in these tectonic plates.
Transform: When two plates are sliding past each other. Earthquakes can occur when the plates are sliding. When an oceanic plate is involved, the movement of the plates could cause a tsunami as well. The water above the transform fault could rise, and grow bigger and bigger. The 2011 Japan Tsunami is a good example of this.
Hope this helps!
Two soccer teams, the Bears and the Panthers, played games at the same time in two different locations. The Bears game was played at sea level, where there is a normal amount of oxygen. Before their game, the players on the Bears ate a lunch of mostly starch. The Panthers game was played at very high altitude, where there is less oxygen. The players on the Panthers ate a lunch of starch and protein. Which team probably did better in their game?
1 point
Answer:
Bears
Explanation:
because starch is heavy and it requires a lot of oxygen in an environment. so having starch in an environment with less oxygen could probably cause fatigue
g The heat capacity of a bomb calorimeter is: a negative quantity with units of kJ/mol a negative quantity with units of J/oC a positive quantity with units of kJ/mol a positive quantity with units of J/oC
Answer:
I believe it is a positive quantity such as water has 4.14 j/oC it is always positive it is the energy needed to raise the temperature by 1 degree celsius
Explanation:
PLEASE HELP!’
DUE IN 10 MINS
Answer:
The products are SnPO4 and LiC2H3O2
Explanation:
The reactants are LiPO4 + Sn(C2H3O2)2
This is a double replacement reaction
So what you do is switch the elements the other way around.
To do that, all you have to do switch Sn with PO4 since Sn is a cation and PO4 is an anion.
Then you switch Li with C2H3O2 because Li is a cation and C2H3O2 is an anion.
After that, check the charges. PO4 has -3 charge
So just leave Sn the way it is without a subscript.
In word form, the product would be Tin(III) Phosphate
C2H3O2 has a -1 charge Li has a +1 charge
So leave both of them the way it is without any subscripts.
In word form, the product would be Lithium Acetate
A piece of silver wire has a mass of 53.91 grams. How many moles of
silver are in the wire?
89 year old toys girl who have some starter pets plez im new
Glucose C6H12O6 is formed in plants during photosynthesis. The molar mass of glucose is:
Answer:
170
Explanation:
C=6×12=72
H=12×1 = 12
O=6×16=96
Molar mass=72+12+96
Molar mass=170
Answer:
180
Explanation:
C = 12
H = 1
O = 16
The molar mass of the glucose is
⇒ 12 x 6 + 1 x 12 + 16 x 6
⇒ 72 + 12 + 96
= 180
Help me pls Do In A HOUR 8th grade science,
Some street lights use incandescent bulbs, and others use LEDS. Which would you recommend and why?
Answer:
I would reccomend LED's because they use much less energy than incandescent bulbs
anybody know this ?? If so help ASAP .
Answer:
Mechanical Energy
Explanation:
Definition: Mechanical Energy The mechanical energy is
the sum of the kinetic and potential energies.
(SK015) Naturally occurring argon consists of thre isotopes , argon-36, argon-38, argon-40 in the ratio of 4.86: 1 : 1423 i) Calculate the percentage composition of the three isotopes. ii) Calculate the relative atomic mass of argon to four significant figures.
Answer:
What
Explanation:
Can u explain
The atomic mass of an element is:
A. The number of protons and electrons
B. The number of protons and neutrons
Explanation:
it b
....
hope it helps!
What is the result of an unstable isotope that give off gamma radiation?
Answer:
When unisotope releases gamma radiation, it does not change the atomic number of the atom .
Explanati
. This is because gamma radiation is the emission of electromagnetic energy from the nucleus in the form of photons, discrete packets of energy.
5. Using one of those fancy capipers I demonstrated in class, I measure the sides of a cube as 6.8 cm, by 6.83 cm, by 9.37 cm. The formula for volume is: V = length X width x height. Using significant digits, what is the best answer you can come up for the volume of the cube?
Answer:
[tex]435.18\ cm^3[/tex]
Explanation:
[tex]From\ the\ measurements\ by\ the\ caliper,\\The\ length\ of\ the\ cube=6.8\ cm\\The\ breadth\ of\ the\ cube=6.83\ cm\\The\ height\ of\ the\ cube=9.37\ cm\\Hence,\\As\ we\ know\ that\ Volume\ of\ the\ cuboid=lbh\\Hence,\\Volume\ of\ the\ cube=6.8*6.83*9.37\\Volume\ of\ the\ cube=435.18\ cm^3\\[/tex]
What is the molarity when 0.181 moles of MgNO3)2 are dissolved in enough water to make 0.750 L solution?
Answer:
Molarity = 0.24 M
Explanation:
Given data:
Number of moles of Mg(NO₃)₂ = 0.181 mol
Volume of solution = 0.750 L
Molarity of solution = ?
Solution:
Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.
Formula:
Molarity = number of moles of solute / L of solution
by putting values,
Molarity = 0.181 mol / 0.750 L
Molarity = 0.24 M
Water changes its state of matter when heat is added or taken away. When water evaporates, the particles in the water vapor
As that liquid water is further heated, it evaporates and becomes a gas—water vapor.
What is evaporation?When a liquid transitions from the liquid phase to the gas phase, evaporation, a sort of vaporization, takes place on the liquid's surface. High concentrations of the evaporating substance in the surrounding gas considerably slow down evaporation, as is the case when humidity impacts the rate of water evaporation.
The way that the liquid's molecules clash determines how much energy is transferred to one another. In order to leave and enter the surrounding air as a gas, a molecule close to the surface must absorb enough energy to outperform the vapor pressure. Evaporative cooling is the process of reducing a liquid's temperature as a result of evaporation, which removes energy from the evaporated liquid.
The majority of the liquid's molecules only hold a small portion of the heat energy needed.
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How does a vase on a table overcome gravity? What would happen if you moved the vase off the table
Answer:
A vase on a table overcomes gravity because of the upwards force of the table against it, which is stronger than the force of gravity. If you were to move the vase off the table it would no longer have anything stopping gravity from breaking it.
Explanation:
Conversions
If you traded (converted)
15 Skittles for M&Ms,
how many M&Ms do you
have?
Conversion Factor
6 Skittles 4 Cookies
1 Cookies = 2 M&Ms
If you traded (converted) 15 Skittles for M&Ms, you will have 20 M&Ms
How to convert 15 Skittles to cookiesWe'll begin by converting 15 Skittles to cookies. This can be obtained as follow:
6 Skittles = 4 Cookies
Therefore,
15 Skittles = (15 Skittles × 4 cookies) / 6 skittles
15 Skittles = 10 cookies
How to convert 10 cookies to M&MsWe can convert 10 cookies to M&Ms as follow:
1 Cookies = 2 M&Ms
Therefore,
10 cookies = (10 cookies × 2 M&Ms) / 1 Cookies
10 cookies = 20 M&Ms
Thus, 15 Skittles is equivalent to 20 M&Ms
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science!
What type of heat transfer takes place when a furnace heats up an entire room?
Radiation, because the element of the heater comes in contact with air in the room
Convection, because energy is carried by waves and not matter
Radiation, because heat travels in a cyclical manner
Convection, because air currents are formed
Answer:
Radiation, because the element of the heater comes in contact with air in the room. Convection, because energy is carried by waves and not matter. Radiation, because heat travels in a cyclical manner.
Explanation:
Answer:
Radiation,
Explanation: