ΔH for this reaction : -2668.4 (exothermic)
Further explanationThe change in enthalpy in the formation of 1 mole of the elements is called enthalpy of formation
The enthalpy of formation measured in standard conditions (25 ° C, 1 atm) is called the standard enthalpy of formation (ΔHf °)
(ΔH) can be positive (endothermic = requires heat) or negative (exothermic = releasing heat)
The value of ° H ° can be calculated from the change in enthalpy of standard formation:
∆H ° rxn = ∑n ∆Hf ° (product) - ∑n ∆Hf ° (reactants)
you can search the value of ΔHf on the internet
∆H ° rxn =( ∆H Al₂O₃+∆H AlCl₃+3.∆H NO + 6.∆H H₂O)-(∆H Al+∆H NH₄ClO₄)
[tex]\tt \Delta H^o~rxn=(-1669.8+-704+(3\times 90.4)+(6.\times -241.8)-(3\times 0+3\times -295)\\\\\Delta H6o~rxn=-3553.4+885=-2668.4~kJ/mol[/tex]
Which organ gives our body the sense to touch, protects it, and helps keep it at the right temperature?
will make brainlest
a.skin
b.heart
c.liver
d.spleen
Answer: Skin
Explanation: You're body has a temperature, and when it touches something, it transfers to you're skin.
how the different occupation h elp a society?
Answer:
Work and Occupations are a fundamental necessity in life. Society depends upon the production of food, machine, various utensils and articles of daily use, newsprint, etc. ... (ii) They Satisfy Man's Social and Psychological Needs Also: Work is not the same thing as physical effort or the expenditure of energy.
Explanation:
when temperature increase gas decrease or increase support u r answer with daily life example
Answer:
increase
Explanation:
dont known reason burr answer is correct
Answer:
When temperature increases ,gas increases ,because of the rise in temperature evaporation will take place.
Explanation:
When you boil water to make coffee/tea the kettle/boiler releases the evaporation caused by the rise in temperature.
How many molecules are in a 189 g sample of carbon tetrabromide, CBr4?
Which of the following is an example of a physical change?(1 point)
dissolving sugar in water
burning a match
boiling an egg
cooking a hamburger
Based on the nature of physical change, dissolving sugar in water is a physical change .
What is a physical change?A physical change is a change which does not produce new substances and which can be easily reversed.
Physical changes do not alter the chemical composition of a substance.
Examples of physical changes include:
Melting of candle waxdissolving sugar in waterfreezing of waterTherefore, dissolving sugar in water is a physical change.
Learn more about physical change at: https://brainly.com/question/960225
Answer: a
Explanation:
In which of the following situations is a plant reproducing sexually?
Answer:
(ANSWER CHOICES ORDER MAY BE DIFFERENT FROM YOURS!!)
A.
The pollen from one flower is transported by an insect to the ovule of another flower.
B.
A potato plant produces a tuber, and the next year, a new plant grows from the tuber.
C.
Part of the stem segment of a cactus plant falls off and begins to form a new plant.
D.
A new shoot emerges from a strawberry plant and produces another plant.
Explanation:
It's "The pollen from one flower is transported by an insect to the ovule of another flower. " because i got it from study island
Can you think of other solutions that might be
acidic?
Answer:
i think the answer is yess
Answer:
Limes, Lemons, Vinegar, Stomach acid, Batteries, Sour Candy, etc.
Nitric Acid, Chloric Acid, Carbonic Acid, Citric Acid, Perchloric Acid, Flouric Acid, etc.
Hope this helps!
Explanation:
What causes uneven heating on Earth? *
Temperature Differences
Earth's Rotation
Earth's Revolution
Global Wind System
if u get it right i will give brainliest
Answer:
temperature differences
Explanation:
Solar heating of the Earth's surface is uneven because land heats faster than water, and this causes air to warm, expand and rise over land while it cools and sinks over the cooler water surfaces. ... Wind is the result of pressure changes in the atmosphere.
Suppose you want to make 2000g of a solution of glucose in water that has
2.8% (m/m) concentration. How much glucose should you use?
Answer:
56 g of glucose
Explanation:
We can find the mass of glucose used as follows:
[tex] \%_{m/m} = \frac{m_{s}}{m_{sol}}\times 100 [/tex] (1)
Where:
[tex]m_{s}[/tex] is the solute's mass =?
[tex]m_{sol}[/tex] is the solution's mass = 2000 g
% (m/m)= 2.8 %
By solving equation (1) for [tex]m_{s}[/tex] we have:
[tex] m_{s} = \frac{\%_{m/m}*m_{sol}}{100} = \frac{2.8*2000 g}{100} = 56 g [/tex]
Therefore, you used 56 g of glucose to make 2000 g of a solution of glucose in water.
I hope it helps you!
This chemical equation represents a chemical reaction.
NaCN + HBr + NaBr + HCN
Which two chemicals are reactants in the chemical reaction?
A.NaCN
B.NaBr
C.HCN
D.HBr
Answer: NaCN and HBr
Explanation:
Atoms can gain, lose, or share
electrons during a chemical change. Why
doesn't this cause the atoms identities to
change?
Answer:
Atoms can gain, lose, or share electrons during a chemical change. Chemical changes do not affect the nucleus of an atom. For this reason, an atom has the ability to retain its properties or identity even if the number of electrons is different. Therefore, the atom's identity won't change.
Explanation:
What is the density of a material if its mass is 32 grams and its volume is 8 milliliters
Answer:
4 kilograms/liters
Explanation:
A closed system initially containing 1×10^-3 hydrogen 2×10^-3M iodine at 448 degree Celsius and is allowed to reach equilibrium. The concentration of the equilibrium shows concentration of hydrogen iodude as 1.87×10^-3M.Calculate kc at this temperature
Answer:
Kc = 50.5
Explanation:
We determine the reaction:
H₂ + I₂ ⇄ 2HI
Initially we have 0.001 molesof H₂
and 0.002 moles of I₂
If we have produced 0.00187 moles of HI in the equilibrium we have to know, how many moles of I₂ and H₂, have reacted.
H₂ + I₂ ⇄ 2HI
In: 0.001 0.002 -
R: x x 2x
Eq: 0.001-x 0.002-x 0.00187
x = 0.00187/2 = 9.35×10⁻⁴ moles that have reacted
So in the equilibrium we have:
0.001 - 9.35×10⁻⁴ = 6.5×10⁻⁵ moles of H₂
0.002 - 9.35×10⁻⁴ = 1.065×10⁻³ moles of I₂
Expression for Kc is = (HI)² / (H₂) . (I₂)
0.00187 ² / 6.5×10⁻⁵ . 1.065×10⁻³ = 50.5
Shanika is an engineer at an amusement park who is experimenting with changes to the setup for a magnetic roller coaster ride. In one ride, there are two identical roller coaster cars (orange and green) that start on opposite sides of a large magnet located at the center of a station. Shanika wants to get the largest increase in potential energy she can by moving one car one space to the left or the right. Shanika can move the orange car to point A or point B, or she can move the green car to point C or point D. Which movement should she make? Why will that movement result in the largest increase in potential energy? Describe the magnetic force that will act on the roller coaster car she moves.
Answer:
Shanika should move the orange coaster car to point B. This movement will result in the largest increase in potential energy. This is because the carts are repelling, which means to increase the potential energy you have to go against the magnetic field. Because the carts are being repelled from the centre magnet to go against the magnetic field you would move the cart closer to the magnet. In this case, moving the orange cart to point b would increase the potential energy greater than any other move.
Explanation:
what i meant in the last sentence was that moving the orange cart to b (closer to centre magnet) would end in a greater potential energy change than moving the other, green, cart closer. This is because of the distances between the carts and the centre magnet. Potential energy does not increase linearly meaning that if a cart is one cart is an inch away from the magnet and another is a foot, if you moved both magnets a cm closer to the centre magnet the one an inch away would have a larger potential energy change.
When a reaction occurs between atoms with ground state electron configurations 1s 2s' and 1s 2s 2p%, the predominant type of bond formed is:
Chemical A and Chemical B react in an exothermic reaction. What can be known about what will happen when Chemical A and Chemical B are mixed together?
Please help. I'm confused.
What determines the strength of a dipole-dipole force?
A. The more symmetrical the molecule, the stronger the force.
B. The more hydrogen in the molecule, the stronger the force.
C. The more polar the molecules, the stronger the force.
D. The larger the atomic radius, the stronger the force.
The more polar the molecules, the stronger the force. Hence, option C is correct.
What is dipole-dipole force?Dipole-Dipole forces are the interaction between molecules of the permanent dipole. It occurs between the partially charged positive molecules and partially charged negative molecules.
Polar molecules align themselves so that the δ– end of one molecule is near the δ+ ends of other molecules.
The molecules are thus attracted to each other. Dipole-dipole forces exist between polar molecules.
The greater the polarity, the stronger the dipole-dipole forces.
Hence, option C is correct.
Learn more about dipole-dipole force here:
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anyone may I get help please
Answer:
-pneumonoultramicroscopicsilicovolcanoconiosis.ogg
Mendelee's periodic table was organized by
Answer:
Mendeleev arranged the elements in order of increasing relative atomic mass . When he did this he noted that the chemical properties of the elements and their compounds showed a periodic trend .
Explanation:
Hope this helps!! Please consider marking brainliest! Have a good one!!What is the total number of electrons in As-3?
Answer:
Arsenic, As, has atomic number 33, which is the number of protons in the nuclei of its atoms. A neutral As atom would also have 33 electrons. The electron configuration of a neutral arsenic atom is [Ar]3d104s24p3
Explanation:
Why do metals tend become cations?
A)
they gain electrons to form a full outer shell
B)
they are most stable when their outside shell is half full
C)
they need to lose electrons in order to obtain a full outer shell
D)
metals do not become cations
Submit
Answer:
For metals it takes a lot less energy to loose 2 electrons then to gain 6. For nonmetals it is easier to gain 2 electrons then to loose 6.
Youre're welcome <3
What forces are present in this situation?
An elevator is rising at a constant speed; the elevator is the object in this situation.
A.gravity and tension
B.normal,gravity,and tension
C.normal and tension
D.gravity
Answer:
A. Gravity and Tension
Explanation:
Gravity and Tension would be the only things changing the rising speed of the elevator.
Normal makes no sense not sure why that is an answer.
Gravity effects how much Tension is pulling on the elevator to go down while the elevator is pushing up.
Let me know if you have any other questions.
Which on, help me please, WILL BE MARKED AS BRAINLEST
Answer:
b and c
Explanation:
Because in a chemical change in order for a substance or matter to change shape it needs to either heat up or cool down
A scientist that studies wind movement should know about________ which helps predict where global winds will go. *
if u get it right i will give u brainliest
Types of fronts
Temperature differences on Earth
Types of breezes
The water cycle
Answer:
Types of fronts because meteorologists are able to predict the weather by the looking at the air mass (fronts) in the atmosphere.
Answer:
Types of fronts
Explanation:
Describe 2 physical changes that could occur with a piece of paper
Answer:
Physical=Ripping
Chemical=Burning
Explanation:
I may be wrong. But I would say these are the answers.
Answer:
ima just take all your points and roll out tbh peace
Explanation:
The fuel tank of an airplane has a device that measures the fuels temperture . Befire tge airplane took off the tenoerature of the fuel was 27 degree c . After the airplane had been flyinf gor one hour the tempertaure of the fuel had decreased to 2 degree c. Which of the follwoing must have happend to moluses in the fuel
Answer:
This question is incomplete
Explanation:
This question is incomplete. However, Jet fuels are produced/designed in such a way that they can absorb cold and become as cold as -47 °C; this is because of the cold temperature in which the jet flies. When the fuel absorbs this coldness, the movement of the molecules in the fuel begins to reduce (just like in every other substance undergoing coolness) and keeps reducing as the temperature keeps dropping. Ordinarily, if this temperature reduces to a particular point (freezing point), the movement of the molecules will stop totally leading to the fuel solidifying/freezing (which has happened sometime before the production of more improved fuel with lower temperature that is been used now).
NOTE: There are some perceived spelling errors in the question. For example, it appears the "moluses" is actually "molecules", "befire tge" is "before the" and "tenoerature" is "temperature".
Answer:
B. Took the test lol
Explanation:
hope this helps
Almost all of Earth's atmosphere is created through the process of photosynthesis.
True
False
Answer:
False
Explanation:
When 21.5 g of CH4 gas reacts with 387.5 g O2 gas, how much CO2 is formed?
Answer:
Mass = 58.96 g
Explanation:
Given data:
Mass of CH₄ = 21.5 g
Mass of O₂ = 387.5 g
Mass of CO₂ formed = ?
Solution:
Chemical equation:
CH₄ + 2O₂ → CO₂ + 2H₂O
Number of moles of CH₄:
Number of moles = mass / molar mass
Number of moles = 21.5 g/ 16 g/mol
Number of moles = 1.34 mol
Number of moles of O₂ :
Number of moles = mass / molar mass
Number of moles = 387.5 g/ 32 g/mol
Number of moles = 12.1 mol
now we will compare the moles of CO₂ with O₂ and CH₄.
O₂ : CO₂
2 : 1
12.1 : 1/2×12.1 = 6.05 mol
CH₄ : CO₂
1 : 1
1.34 : 1.34
Number of moles of CO₂ produced by CH₄ are less thus it will limiting reactant.
Mass of CO₂:
Mass = number of moles × molar mass
Mass = 1.34 mol × 44 g/mol
Mass = 58.96 g
Which is a direct result of increased consumption of metals?
rising sea levels
climate change from the use of metals
pollution from mining operations
increased human population
Answer:
Answers:Pollution from mining operations.
A direct result of increased consumption of metals is: C. pollution from mining operations.
Mining can be defined as a process through which minerals and metals are excavated from the planet Earth, especially from a reef, vein, seam, lode or an ore body.
Generally, the above process (mining) results in the pollution of the environment.
Pollution can be defined as the physical degradation (contamination) of the environment through an emission of pollutants or waste materials.
Some examples of pollutants or waste materials that are found in different parts of the world are;
Ozone.Nitrogen dioxide.Particulate matter.Sulphur dioxide.Carbon monoxide.Lead.In conclusion, pollution from mining operations is mainly as a result of an increased consumption of metals such as lead, tin, etc. because of the degrading processes associated with them.
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How do You Think the radius of an atom will change as you move down a Group (Vertical Column) in the periodic table
Answer:
As you move left to right, the atomic radius gets SMALLER, so atoms hold on to their electrons more tightly and are more reactive. As you move down a group, the atomic radius gets LARGER, so atoms have a weaker hold on their electrons and are less reactive
Explanation:
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