Answer:
The enthalpy change for the solution process [tex]\Delta H_{rxn}[/tex] = - 158.34 kJ/mol
Explanation:
Given that:
The mass of salt AX = 2.499 g
The mass of water = 135.3 g
The mass of the solution = ( 2.499 + 135.3 ) g = 137.799 g
The specific heat of salt solution s is known to be = 4.18 J/g° C
The change in temperature i.e. ΔT = 35.2 °C - 23.6 °C = 11.6 °C
Thus, the amount of heat raised is equal to the heat absorbed by the calorimeter.
∴
[tex]q_{reaction} = q_{solution}[/tex]
[tex]q_{reaction} = -ms_{solution} \Delta T[/tex]
[tex]q_{reaction} = -137.799 \ g \times 4.18 \dfrac{J}{g^0C}\times 11.6^0C[/tex]
[tex]q_{reaction} = - 6682 \ J[/tex]
[tex]q_{reaction} = - 6.682 \ kJ[/tex]
Recall that the mass of the salt = 2.499 g
The number of moles of the salt = [tex]2.499 \ g \times \dfrac{1 \ mol \ of \ AX}{59.1097 \ g}[/tex]
= 0.0422 mol of AX
Finally the enthalpy change, [tex]\Delta H_{rxn} = \dfrac{- 6.682 \ kJ}{ 0.0422 \ mol}[/tex]
= - 158.34 kJ/mol
The enthalpy change for the solution process [tex]\Delta H_{rxn}[/tex] = - 158.34 kJ/mol
Which elements are more likely to lose electrons?
Ca, Li, F and Ne
A cup of water at 298 K (the system) is placed in a microwave oven and the oven is turned on for 1 minute during which it begins to boil. What is the sign of q and w
On this particular case, both heat and work are applied to the system, so both signs are positive.
Relation between work and heat?
We define Q as the heat, and W as the work, such that, by the first law of thermodynamics, we know that:
change in energy = Q + W.
In this case, we have a cup of water which is placed in a microwave oven, so this is a reservoir that gives heat to our system. Then Q is positive (because the heat is being applied to the system).
On the work side. If we do work on the system, the sign is positive. If the work is done by the system, the sign is negative
In this case, the work is applied to the system (as it rotates on the plate), thus the sign of the work is positive.
If you want to learn more about thermodynamics, you can read:
https://brainly.com/question/9614649
Determine the amount of moles of SiO2 needed to produce 4.80g of CO.
SiO2(s) + _C(s) — _SiC(s) + I co(g)
A)134 mol
B)0.171 mol
C)67.2 mol
D) 0.0857 mol
Which of the following does not describe an object with high
elasticity?
a
A piece of paper that rips after pulling on it.
b A spring that easily compresses when pushed.
A slinky that expands and contracts when held at
one end.
d A rubber band that stretches when you pull on it.
Chockit
Answer:
Explanation:
C
Almost all scientific work before Emperor
Chin was destroyed. Why?
Answer:The Qin Dynasty established the first empire in China, starting with efforts in 230 B.C., during which the Qin leaders engulfed six Zhou Dynasty states. The empire existed only briefly from 221 to 206 B.C., but the Qin Dynasty had a lasting cultural impact on the dynasties that followed.
Capital of Qin Dynasty
The Qin region was located in modern-day Shaanxi province, north of the Zhou Dynasty territory - Qin served as a barrier between it and the less civilized states above it. The capital of the Qin Dynasty was Xianyang, which was extensively enlarged after Qin dominance was established.
Qin itself had been considered a backwards, barbarian state by the ruling Zhou Dynasty. This distinction had to do with its slow pace in embracing Chinese culture, for instance, lagging behind the Zhou in doing away with human sacrifice.
The ruling class of Qin nonetheless believed themselves to be legitimate heirs to the Zhou states, and through the centuries they strengthened their diplomatic and political standing through a variety of means, including marriage.
Shang Yang
It was during the rule of Duke Xiao from 361 to 338 B.C. that the groundwork was laid for conquest, primarily through the work of Shang Yang, an administrator from the state of Wey who was appointed Chancellor.
Shang Yang was a vigorous reformer, systematically reworking the social order of Qin society, eventually creating a massive, complicated bureaucratic state and advocating for the unification of Chinese states.
Explanation:
A hydrogen-like ion is an ion containing only one electron. The energy of the electron in a hydrogen-like ion is given by:
En = −(2.18 × 10^−18J) Z^2 ( 1/n^2 )
where n is the principal quantum number and Z is the atomic number of the element. Plasma is a state of matter consisting of positive gaseous ions and electrons. In the plasma state, a mercury atom could be stripped of its 80 electrons and therefore could exist as Hg80+. Use the equation above to calculate the energy required for the last ionization step.
hydrogen-like ion is an ion containing only one electron. The energy of the electron in a hydrogen-like ion is given by:
En = −(2.18 × 10^−18J) Z^2 ( 1/n^2 )
where n is the principal quantum number and Z is the atomic number of the element. Plasma is a state of matter consisting of positive gaseous ions and electrons. In the plasma state, a mercury atom could be stripped of its 80 electrons and therefore could exist as Hg80+. Use the equation above to calculate the energy required for the last ionization step.hydrogen-like ion is an ion containing only one electron. The energy of the electron in a hydrogen-like ion is given by:
En = −(2.18 × 10^−18J) Z^2 ( 1/n^2 )
where n is the principal quantum number and Z is the atomic number of the element. Plasma is a state of matter consisting of positive gaseous ions and electrons. In the plasma state, a mercury atom could be stripped of its 80 electrons and therefore could exist as Hg80+. Use the equation above to calculate the energy required for the last ionization step.hydrogen-like ion is an ion containing only one electron. The energy of the electron in a hydrogen-like ion is given by:
En = −(2.18 × 10^−18J) Z^2 ( 1/n^2 )
where n is the principal quantum number and Z is the atomic number of the element. Plasma is a state of matter consisting of positive gaseous ions and electrons. In the plasma state, a mercury atom could be stripped of its 80 electrons and therefore could exist as Hg80+. Use the equation above to calculate the energy required for the last ionization step.
please mark me as brainliest............
follow me..........
More than half the total present volume of ocean water resides in what ocean?
The Pacific Ocean is the largest ocean in the world based on water volume, totaling some 660 million cubic kilometers and is almost equally divided into the North and South Pacific waters.
which force holds distant stars and other matter together?
Answer:
Gravity is the force that holds everything in the universe together.
Hope that helps!
9) The temperature at which a substance in the liquid state freezes is the same as the
temperature at which the substance-
a. Melts b. Sublimes
c. Boils
d. Condenses
Answer:
A
Explanation:
When solid converts to liquid then heat is required to break the intermolecular forces of attraction between the particles. In this process heat increase but temperature remains the same. Therefore, the correct option is option A.
What is phase transition?Phase transition is a process in which transition takes place from one state to another of a medium on changing temperature or pressure. Phase transition is a physical process as there is no breaking of old bond and forming of new bonds takes place.
During phase transition temperature remain constant as the extra heat that is given to the system that goes into breaking of intermolecular forces of attraction between the particles. So overall temperature remains same but heat keeps on increasing. The temperature at which a substance in the liquid state freezes is the same as the temperature at which the substance melts.
Therefore, the correct option is option A.
To learn more about phase transition, here:
https://brainly.com/question/3255181
#SPJ2
When aqueous solutions of (NH4)2CrO4 and Ba(NO3 )2 are combined, BaCrO4 precipitates. Calculate the mass, in grams, of the BaCrO4 produced when 2.76 mL of 0.19 M Ba(NO3 )2 and 3.86 mL of 0.716 M (NH4)2CrO4 are mixed. Calculate the mass to 3 significant figures
The mass, in grams of BaCrO4 that will be produced, according to the illustration, would be 0.1329 grams
Stoichiometric calculationsFrom the equation of the reaction:
Ba(NO3)2 + (NH4)2CrO4 → BaCrO4 + 2(NH4)NO3
The mole ratio of the reactants is 1:1.
Mole of (NH4)2CrO4 = 3.86/1000 x 0.716
= 0.0028 moles
Mole of Ba(NO3 )2 = 2.76/1000 x 0.19
= 0.0005 moles
Thus, Ba(NO3 )2 is limiting in availability.
Mole ratio of Ba(NO3 )2 and BaCrO4 = 1:1
Mole equivalent of BaCrO4 = 0.0005 moles
Mass of 0.0005 moles BaCrO4 = 0.0005 x 253.37
= 0.1329 grams
More on stoichiometric calculations can be found here: https://brainly.com/question/8062886
a person stretches a spring apart in their figures and holds it there, not moving this is an exmple of?
A.Potential energy turning into kinetic energy
B. Someone creating energy
C. Someone destroying energy
D. Kinetic energy turning into potential energy
Answer:
pretty sure D is the right answer
Explanation:
kinetic energy is energy of motion, potential is energy that is stored
how does crushing affect solubility
Answer:
I think crushing affect solubility in that it increases the surface area of the solute in contact with the solvent
Need help on worksheet
B. Match each term to its description or definition. (4 points)
-
A. Heat
B. Thermal energy
C. Conduction
D. Convection
E. Radiation
F. Specific heat
G. Enthalpy
H. Entropy
_____ Heat required to raise 1 g of a substance 1°C
_____ The transfer of thermal energy between objects
_____ A measure of the randomness in a system
_____ Heat transfer through direct contact between molecules
_____ Heat given off or absorbed in a reaction
_____ Heat transfer by way of electromagnetic waves
_____ Total kinetic energy of all molecules in a system
_____ Heat transfer through movement of liquids or gases
Molecules are always in constant random motion due to the possession of energy. The thermal energy is the total kinetic energy of all molecules in a system.
What is entropy?The term entropy refers to the degree of disorderliness in a system. We shall now match each term with its appropriate description.
Heat - The transfer of thermal energy between objectsThermal energy - Total kinetic energy of all molecules in a systemConduction - Heat transfer through direct contact between moleculesConvection - Heat transfer through movement of liquids or gasesRadiation - Heat transfer by way of electromagnetic wavesSpecific heat - Heat required to raise 1 g of a substance 1°CEnthalpy - Heat given off or absorbed in a reaction Entropy - A measure of the randomness in a systemLearn more about thermal energy:https://brainly.com/question/11278589
How are new elements made and named?
Answer:
Science textbooks around the world have become suddenly out of date. Four new chemical elements have been added to the periodic table. A big decision now lies ahead - elements 113, 115, 117 and 118 need to be given their official names and symbols.
New elements can be named after a mythological concept, a mineral, a place or country, a property or a scientist. The names have to be unique and maintain "historical and chemical consistency" . This means a lot of "-iums".
"They're Latinising the name," explains chemist Andrea Sella of University College London. "The most recent tradition has been to name them after places or after people." The places chosen tend to be where the element was discovered or first manufactured. The Swedish village of Ytterby has managed to get four named after it (ytterbium, yttrium, erbium and terbium).
No-one has yet named an element after themselves but many elements are named in tribute to important scientists. Albert Einstein was given einsteinium. This can also be a way of righting the wrongs of the past. "Lise Meitner was really the chemist who spotted nuclear fission but she was never really recognised for it because she was Jewish and a woman," says Sella. "To be able to give an element a name that reminds us of her is I think greatly important."
The naming process isn't quick. The scientists who discovered them will start things off by proposing a name. But it will be down to the International Union of Pure and Applied Chemistry (IUPAC) to approve it. A special division of the US-based group has to accept the proposal. There is then a public review period of five months before the IUPAC council gets the final approval. Once it's ready, the name is announced in the scientific journal Pure and Applied Chemistry .
Scientists sometimes get creative. Mythical names have proved popular. Promethium was named after a character from a Greek legend who stole fire from the gods to give to humans and was punished by being chained to rock so an eagle could feed on his liver. The name was meant to reflect the fact that synthesising new elements often requires sacrifice.
There is hidden meaning in the table - as in the naming of praseodymium and neodymium. They replaced didymium - wrongly thought to be an element but in fact a mixture of the two. "The reason I like them is because they're called the green twin and the new twin," says Sella. "Didymium was named after [the Greek for] twin but in fact it also means testicles."
Naming an element is not just about functionality. "There's a tremendous romance to this," he adds. "Names are always important."
How do you find the volume of a linear object?
Read each situation carefully. Write how energy transformation occurs in each situation. Write your answer on a separate sheet of paper.
1. Gerald just finish his work out at the gym. He ran at the park for 30 minutes and got very sweaty. What energy transformation took place while he was running?
2. Joshua was very hungry when he got home from the school. He decided to make some popcorn in the microwave. What energy transformation allowed Joshua's popcorn to pop?
3. Jeremy shaves every week using a battery powered shaver. What energy transformation shows how the shaver works?
4. Rica studies her lesson before going to bed at night. She makes use of a lampshade in studying her lessons. What energy transformation occurs when she plugged in the lamp shade and turned it on?
5. Dennis used to watch his favorite cartoon character every saturday using the smart television. What energy transformation occurs on the television?
[tex]tysm \: in \: advance[/tex]
Answer:
1. Mechanical energy
2. Thermal energy
3. electric energy to mechanical energy
4. electrical energy to light
5. electric energy into sound energy and radiant energy
Explanation:
Which is a major environmental concern for our oceans?
Question 5 options:
oxygen pollution
plastic pollution
nutrient pollution
air pollution
Element “X” is a brand new element. Scientists discovered that 80% of the atoms of element
“X” have a mass number of 10 amu and the other 20% have a mass of 11 amu. What is the avg.
atomic mass of element "X"?
Answer:
Average atomic mass of X is 10.2 amu.
Explanation:
Given data:
Percentage abundance of X-10 = 80%
Percentage abundance of X-11 = 20%
Average atomic mass of X = ?
Solution:
Average atomic mass of X = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) / 100
Average atomic mass of \X = (80×10)+(20×11) /100
Average atomic mass of X = 800 + 220 / 100
Average atomic mass of \X = 1020 / 100
Average atomic mass of X = 10.2 amu
What happens to the rate of reaction as the reactants get used up in a reaction?
Answer:So, when a reactant gets used up, its concentration decreases, and so the total reaction rate decreases. As you can see here, more products equal less reagents (reactants), and so the reaction rate decreases.
Explanation: i hope this helps!! :)))
What is the example of erosión happening around your neighborhood or local area?
Answer:
When it rains in my backyard, the rain carries the soil to the edge of my backyard near the fence and creates a huge mud puddle.
Explanation:
please need you help aspa
the kenetic energy of a roller coaster is 100 joules. the potential energy of the same coaster is 100 joules. what is the mechanical energy of the coaster
You are given a food sample in powder form. How do you determine the food class of the food sample?
If I were given a food sample in powdered form I would determine the food class of the food sample by adding some water to it. By adding water to the Powder the nature of the the food can be easily determined based on the solubility of the Powder in water.
Does doubling the temperature for a reaction cut the activation enegry in half?
In general, if you double the temperature you double the reaction rate. However, this does not mean the activation energy is cut in half
Determine the volume in mL of 0.242 M NaOH(aq) needed to reach the equivalence (stoichiometric) point in the titration of 46.79 mL of 0.204 M propanoic acid(aq). The Ka of propanoic acid is 1.3 x 10-5.
The volume (in mL) of 0.242 M NaOH solution needed for the titration reaction is 39.44 mL
Balanced equationCH₃CH₂COOH + NaOH —> CH₃CH₂COONa + H₂O
From the balanced equation above,
The mole ratio of the acid, CH₃CH₂COOH (nA) = 1The mole ratio of the base, NaOH (nB) = 1How to determine the volume of NaOHVolume of acid, CH₃CH₂COOH (Va) = 46.79 mL Molarity of acid, CH₃CH₂COOH (Ma) = 0.204 MMolarity of base, NaOH (Mb) = 0.242 MVolume of base, KOH (Vb) =?MaVa / MbVb = nA / nB
(0.204 × 46.79) / (0.242 × Vb) = 1
Cross multiply
0.242 × Vb = 0.204 × 46.79
Divide both side by 0.242
Vb = (0.204 × 46.79) / 0.242
Vb = 39.44 mL
Thus, the volume of NaOH needed for the reaction is 39.44 mL
Learn more about titration:
https://brainly.com/question/14356286
Jerry pushes a 3.2 kg box with an acceleration of 5.6 m/s^2.what is the resultant force?
Answer:
1.5 N, mass m= 3.2 kg. F = m * a. 1.5 = 3.2 * a
Explanation:
pa help pa help pa help
what is the mass of fructose also known as fruit sugar (c6h12o6) in a 1.38×10^2ml sample of glucose solution that has a concentration of a 1.04m
Answer:
its 1.04
Explanation:
What are the intermolecular forces present in acetone?.
Answer:
dipole-dipole forces will be present.
Explanation:
dipole will be present because Water has a dipole and can also hydrogen bond, as can isobutyl alcohol.
What 2 locations have the greatest kinetic energy
Answer:
what??? Is this the complete quetion??