As [tex]CaCl_{2}[/tex] dissolves in water, and warms the solution, delta H is negative, and delta S is positive.
What are exothermic and endothermic reactions?Chemical reactions that release energy are called exothermic. In exothermic reactions, more energy is released when the bonds are formed in the products which is used to break the bonds in the reactants. Chemical reactions that absorb (or use) energy are called endothermic.
The dissociation of [tex]CaCl_{2}[/tex] in water is
[tex]CaCl_{2}+H_{2}O(l)=Ca_{++}+2Cl_{-}+H_{2}O(l)[/tex]
As the solution is warm, change in Enthalpy is exothermic ΔH < 0.
(ΔH is negative, so the dissociation is exothermic).
As there are produced 2 ions from 1 solid molecule, the disorder is increasing and ΔS > 0
Hence, option C is correct.
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All elements in Group 18 are called________________ _______________ and are ______________, which means they don’t readily react with other elements.
Answer:
All elements in Group 18 are called noble gases and are nonreactive which means they don’t readily react with other elements.
Explanation:
Copper can be shaped into wires because it is
.ANSWER:Copper is a ductile metal
EXPLAIN :This means that it can easily be shaped into pipes and drawn into wires. Copper pipes are lightweight because they can have thin walls. They don't corrode and they can be bent to fit around corners.
Copper is a ductile metal due to ductility.This means that it can easily be shaped into pipes and drawn into wires. Copper pipes are lightweight because they can have thin walls.
Ductility is a mechanical property commonly described as a material's amenability to drawing (e.g. into wire).In materials science, ductility is defined by the degree to which a material can sustain plastic deformation under tensile stress before failure. Ductility is an important consideration in engineering and manufacturing. It defines a material's suitability for certain manufacturing operations (such as cold working) and its capacity to absorb mechanical overload.
Some metals that are generally described as ductile include gold and copper, while platinum is the most ductile of all metals in pure form.However, not all metals experience ductile failure as some can be characterized with brittle failure like cast iron. Polymers generally can be viewed as ductile materials as they typically allow for plastic deformation.
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Male bower birds attract mates with their _______.
A.
feathers
B.
looks
C.
songs
D.
behavior
Answer:
D
Explanation:
Male bowerbirds use their intelligence to impress the females, constructing elaborate structures called bowers to attract mates.
Answer: D. Behavior
Explanation: this is what it says the corresponding answer is on study island
HELP ME!!! Is it right? Or wrong
Dry air is 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide so varying amounts of water vapor- depending on humidity. Some gases however strongly absorb infrared radiation and trap it in the atmosphere and can therefore result in elevated global temperatures. Therefore they are termed greenhouse gases. Which greenhouse gas have we observed a marked increase in atmospheric concentrations in the last 100 years?
A. methane (CH4)
B. carbon monoxide
C. carbon dioxide
D.ozone (03)
E. oxygen
F. nitrogen
G.water vapor (H20)
Answer:
C. Carbon dioxide
Explanation:
Carbon dioxide is one of the end-product of combustion reactions involving many fuels today.
With the rapid increase in urbanization and technological development, man demand for energy increased tremendously. The discovery of fossil fuels paved the way for the astronomical increase in the concentration of carbon dioxide in the atmosphere. The burning of fossil fuels like coal and oil invovles the process where the carbon atoms present in these fuels combine with oxygen in the air to make CO2. This has resulted in an increase in the concentration of atmospheric carbon dioxide (CO2).
The burning fossil fuels for electricity, industry, heat, and transportation are the major sources of the emossion of carbon dioxide.
Also, the cutting down of trees for paper production, building construction and for the establishment of settlements also increase the concentration of carbon dioxide in the atmosphere. Trees are help remove carbon dioxide from the atmosphere through the process of photosynthesis. However, when these trees are cut down, carbon dioxide accumulates in the atmosphere.
what are the isomers of hexane
Physical properties
Isomer M.P. (°C) B.P. (°C)
n-hexane −95.3 68.7
3-methylpentane −118.0 63.3
2-methylpentane (isohexane) −153.7 60.3
2,3-dimethylbutane −128.6 58.0
1 more row
How many non bonding electrons are on the central atom of a molecule of RnF4?
Which of the following is NOT correct about the mole concept?
1 point
1 mole of sodium atoms will ionize to produce 1 mole of sodium ions and 1 mole of
electrons
A mole is the number of carbon atoms in 12g of C-12 isotope.
A mole is the number of molecules in 22.4 dm3 of all gases at all temperatures and
pressures
A mole is the number of electrons that carry one Faraday of electricity
A mole is the number of molecules of water in 18 g of ice, water or water vapour
Answer:
a mole is the number of molecules in 22.4 dm³ for all gases at all temperatures and pressures
The galaxies pictured above would best be classified as
A barred galaxies
C irregular galaxies
B spiral galaxies
D
elliptical galaxies
Answer:
Spiral galaxies
Explanation:
Can You please solve the questions in the photo. Will give branliest.
Answer:
a.
Explanation:
please click the heart and rate excellent and brainleist to
0.03mol of element Y combines with 762g of iodine to produce an iodide salt. State the empirical formula of the iodide salt
Answer:
ok bahsnkqlaibn. jsnsugsoq
Which of the following equations is not balanced?
O 2NaHCO3 + H2SO4 -> Na2SO4 + 2H2O + CO2
O 2NO + O2 -> 2NO2
O Cu + 2AgNO3 -> Cu(NO3)2 + 2Ag
O 2Mg + O2 -> 2MgO
O CaCO3 -> CaO + CO2
Answer:
1 2NaHCO3+H2SO4->Na2SO4+2H2O+2CO2
Which is the most likely reason bacteria populations do not grow at exponential rates in nature?
A.
Conditions necessary for growth occur for a long time.
B.
Conditions necessary for growth occur only for a short time.
C.
The environment changes, and conditions are always favorable.
D.
The environment changes, and conditions are not always favorable.
Answer:
D
Explanation:
The environment always changes, and sometimes it can be a bad thing. Hope this helps! plz mark as brainliest!
This is the original color of the Statue of Liberty gifted to the United States by
France. It's very different from the way it looks today. Describe why it has
changed and possible causes.?
Answer:
The Statue of Liberty represents Libertas, the Roman Goddess of Liberty. She is holding a torch and a tablet with the date of the US Declaration of Independence. She is dressed in a robe, wears a crown, and has a broken chain at her feet. The Statue of Liberty was a gift from France to the United States. It was designed by the sculptor Frederic Auguste Bartholdi and built by Gustave Eiffel in 1886. The US designed and paid for the granite and concrete foundation .Over the next three decades, the statue slowly began to change color. Currently, the Statue of Liberty is green in color. How did this happen? The air and water reacted with the copper metal and resulted in oxidation. This oxidation created a layer of patina, a copper carbonate. This does not harm the statue and actually helps to protect the copper sheets below.
Explanation:
hope this helps!
~mina
Answer:
during the Revolutionary War, France became a close friend of Americans seeking freedom from Great Britain. To honor its friendship with America, France gave the U.S. a special gift: sculptor Frederic-Auguste Bartholdi's beautiful statue called Liberty Enlightening the World.
The Statue of Liberty arrived in New York Harbor on June 19, 1885. It came in 350 pieces packed into 214 crates. The statue was assembled on a pedestal base built by the United States. The 151-foot tall statue has become a worldwide symbol of freedom and democracy.
The Statue of Liberty's home is Bedloe's Island (renamed Liberty Island in 1956). From 1892 to 1943, “Lady Liberty" greeted over 12 million immigrants as they arrived on boats at the nearby Ellis Island Immigration Station.
Explanation:
hope this helps, have a good day :)
~evita
able 1 Cell Type Operating Cell Potential for Commercial Batteries, E (V) Lithium-iodine Zinc-mercury +2.80 +1.35 Table 2 Standard Reduction Potential, E' (V) -1.20 Half-Reaction [Zn(OH)212 +2e → Zn + 4 OH Zn(OH)2 +2e → Zn +20H- HgO + H2O +2e → Hg+20H O2 + 2H20 +40 →40H -1.25 +0.10 +0.40 ctronic devices that help regulate the heart rate. Currently, lithium-iodine cells are commonly used to power pacemakers and have replaced zinc-me otential, E, for each cell. Table 2 provides the standard reduction potentials for several half-reactions related to zinc-mercury and zinc-air cells. dation given, which of the following is a major difference between the zinc-mercury cell and the lithium-iodine cell? 0, +2H2O + 4e +40H +0.40 Pacemakers are electronic devices that help regulate the heart rate Currently, lithium-iodine cells are commonly used to power pacemakers and have replaced zinc-mercury cells. Table 1 provides the operating cell potential, E, for each cell. Table 2 provides the standard reduction potentials for several half-reactions related to zinc-mercury and zinc air cells. Based on the information given, which of the following is a major difference between the zinc mercury cell and the lithium-iodine cell?
A. During the initial cell operation, each reaction is thermodynamically favorable, but the larger operating potential of the lithium-iodine cell indicates that its cell reaction is less thermodynamically favorable.
B. During the initial cell operation, each reaction is thermodynamically favorable, but the larger operating potential of the lithium-iodine cell indicates that its cell reaction is more thermodynamically favorable.
C. During the initial cell operation, the oxidation of iodine is thermodynamically favorable but the oxidation of mercury is not.
D. During the initial cell operation, the oxidation of mercury is thermodynamically favorable but not the oxidation of iodine is not.
Answer:
During the initial cell operation, each reaction is thermodynamically favorable, but the larger operating potential of the lithium-iodine cell indicates that its cell reaction is more thermodynamically favorable. ( B )
During the initial cell operation, the oxidation of iodine is thermodynamically favorable but the oxidation of mercury is not. ( C )
Explanation:
The major Differences between The Zinc mercury cell and Lithium-iodine cell are :
During the initial cell operation, each reaction is thermodynamically favorable, but the larger operating potential of the lithium-iodine cell indicates that its cell reaction is more thermodynamically favorable. and
During the initial cell operation, the oxidation of iodine is thermodynamically favorable but the oxidation of mercury is not.
Given the relationship below,
Δ G = -nFE
E = emf of cell , G = free energy.
This relationship shows that if E is positive the reaction will be thermodynamically favorable also if E is large it will increase the negativity of free energy also From the question we can see that with the reduction of mercury the value of E is more positive and this shows that Mercury is thermodynamically unfavorable
Select the correct answer.
Which of the following best describes physical science?
OA
the study of motion
B.
the study of matter and energy
Ос.
the study of Earth's structure and processes
OD
the study of reactions
O E.
the study of living things
B. The study of matter and energy
What is the study of matter and energy and how do they interact?
Physics is the scientific study of matter and energy and how they interact with each other. This energy can take the form of motion, light, electricity, radiation, gravity - just about anything, honestly. Physics deals with matter on scales ranging from sub-atomic particles (i.e. the particles that make up the atom and the particles that make up those particles) to stars and even entire galaxies.
What are energy and its relation to matter?
The mass of these three particles is less than the mass of a neutron, so they each get some energy as well. So energy and matter are really the same things. Completely interchangeable. And finally, Although energy and mass are related through special relativity, mass and space are related through general relativity.
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Answer: B. The study of matter and energy
Explanation: Physical science studies Chemistry and physics
"The two main branches of physical science are physics and chemistry. Both types of physical science involve the study of MATTER. Chemistry is the study of the properties of matter and its interactions with other matter, where physics is the study of how matter is affected by ENERGY "
Write it down in your notes!
How many grams are needed to prepare 1.50L of a 1.50M solution of NaNO3?
Answer:
jjjjyuuuuuuujyyllyyyyyyyyyyyyyy
Which of the Following is a true statement regarding a strong acid such as 0.1M HNO3(aq) and weak acid such as HF?
A. 0.1 M HNO3 (aq) solution contains more H+ than HF(aq) solution
B. 0.1 M HNO3 (aq) solution contains less H+ than HF(aq) solution
C. 0.1M HNO3 (aq) solution contains the same amount of H+ as HF (aq) solution
D. 0.1M HNO3 (aq) solution has a higher pH then the HF (aq) solution
Answer:
A. 0.1 M HNO3 (aq) solution contains more H+ than HF(aq) solution
Light and radio are examples of the __________________________ or ______________________ energy form, which is ________________ because it is always moving.
Answer:
Radiant; electromagnetic; kinetic energy.
Explanation:
Energy can be defined as the ability (capacity) to do work. The various forms of energy are solar energy, electrical energy, chemical energy, thermal energy, wind energy, nuclear energy etc.
The two (2) main types of energy are;
a. Gravitational potential energy (GPE): it is an energy possessed by an object or body due to its position above the earth.
b. Kinetic energy (KE): it is an energy possessed by an object or body due to its motion.
Light and radio are examples of the radiant or electromagnetic energy form, which is kinetic energy because it is always moving.
Kinetic energy can be defined as an energy possessed by an object or body due to its motion.
Mathematically, kinetic energy is given by the formula;
[tex] K.E = \frac{1}{2}MV^{2}[/tex]
Where;
K.E represents kinetic energy measured in Joules.
M represents mass measured in kilograms.
V represents velocity measured in metres per seconds square.
what is the difference between empire and kingdom
Answer:
An empire is a sovereign state consisting of of several countries or peoples subject towards the authority of a single person often an emperor or empress. A kingdom consists of land from the same region or area head under the nominal rule of king or queen. Hope this helped!! :D
Explain what might happen to tundra animals, such as polar bears, as earth's climate warms. pls explain
Answer:
They will die.
Explanation:
Polar Bears were made to live in the frigid temperatures of the tundras. If there is a temperature change it can affect their habitat. It can destroy it and they would have to move out to another place. They can die due to global warming.
The planets orbit the sun because they are attracted by the sun's
A
heat
B
Light
С
gravity.
D
friction
Answer:
Gravity of sun
Explanation:
The Gravity force of the sun holds the planets and other planetary body in their certain orbits. The Earth and other planets circles the Sun due to the gravitational force of the Sun, much as the Moon orbits the Earth due to the gravitational pull of the planet Earth. Moon revolve around earth and same earth and other planet revolve around sun.
Directions: Complete the paragraph by writing the equivalent word or group of words in each
diagram presented. Write your complete paragraph/answer on your answer sheet.
Answer:
1) sunlight
2) radiation
3) radiant Energy
4) heat
5) temperature
Explanation:
1) Solar energy is derived from the sunlight.
2) Now, solar energy gets to the Earth's atmosphere by electromagnetic radiation which warms the Earth's surface.
3) Sunlight is a form of radiant energy because the light from the sun is transmitted by radiation to the earth.
4) When sunlight reaches the earth it is converted to heat energy.
5) Due to the heat from the sun, it will increase the Temperature of objects.
please help me thanks
Answer:
diamond is the ans
Explanation:
hope it helped!!!
what is the process by which gas changes to a solid
Crystallization: What is the difference between raw and pure products?
Answer:
Hello There!!
Explanation:
Pure products come from and made where they are original made and raw products are just pasteurized with no added ingredients included in them.
hope this helps,have a great day!!
~Pinky~
A flexible container at an initial volume of 6.13 L contains 2.51 mol of gas. More gas is then added to the container until it reaches a final volume of 11.3 L. Assuming the pressure and temperature of the gas remain constant, calculate the number of moles of gas added to the container.
Answer:
2.12 moles of gas were added.
Explanation:
We can solve this problem by using Avogadro's law, which states that at constant temperature and pressure:
V₁n₂=V₂n₁Where in this case:
V₁ = 6.13 Ln₂ = ?V₂ = 11.3 Ln₁ = 2.51 molWe input the data:
6.13 L * n₂ = 11.3 L * 2.51 moln₂ = 4.63As 4.63 moles is the final number of moles, the number of moles added is:
4.63 - 2.51 = 2.12 molesPlease only answer if you're going to help.
Match the following items with their definitions.
1. capable of being dissolved
2. not capable of being dissolved
3. to break up in molecular or ionic parts to form a solution
4. the substance that is dissolved in the solution
5. the substance that does the dissolving
6. any solution with water as the solvent
solute
solvent
aqueous
soluble
dissolve
insoluble
Answer:
1.solvent
2.unsoluble
3.solute
4.solvent
5.souble
6.aqueous
What must two objects have in order for gravitational force to act on them speed gorse mass orbit
Answer:
it is mass
Explanation:
I took the test
can you help me with balancing equations
Answer:
Explanation:
number 5
S∨8 +8O∨2 =8SO∨2