KOH+NaCl⇒NaOH+KCl
there is no net ionic equation because all compounds dissolves
When a 4. 25-g sample of solid ammonium nitrate dissolves in 60. 0 g of water in a coffee-cup calorimeter, the temperature drops from 22. 0 ∘c to 16. 9 ∘c
The amount of heat which is released during the given change is -1,369.68 Joules.
How do we calculate the required heat?Required amount of heat in any chemical reaction will be calculated as:
Q = mcΔT, where
m = mass = 4.25 + 60 = 64.25g
c = specific heat = 4.18 J/g. degree C
ΔT = change in temperature = 16.9 - 22 = -5.1 degree C
On putting values, we get
Q = (64.25)(4.18)(-5.1) = -1,369.68 J
Hence released heat in the reaction is -1,369.68 J.
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Which element naturally occurs as a diatomic molecule?.
Answer:
There are 7 diatomic elements: hydrogen, nitrogen, oxygen, flourine, chlorine, iodine and bromine
What is the difference between clastic and chemical sedimentary rocks?
Clastic rocks are classified by grain shape, grain size, and sorting. Chemical sedimentary rocks are precipitated from water saturated with dissolved minerals. Chemical rocks are classified mainly by the composition of minerals in the rock.
hi again, hope this helps ^^
Answer: The difference is clastic rocks are classified by grain size, grain shape, and sorting. Chemical sedimentary rocks are precipitated from water saturated with dissolved minerals. They are also mainly classified by the composition of minerals that are in the rock.
Explanation:
A metal wire has a length l and a cross-sectional area a. The resistance of the wire is directly proportional to
The resistance of the wire is directly proportional to the length of the wire, l.
What is resistance?Resistance is given as the ability of the wire to resist or stop the flow of current. The resistance of the wire can be given to have the formula:
[tex]\rm Resistance=\dfrac{length }{area}[/tex]
Thus, it can be given that the resistance of the wire is inversely proportional to the area of the cross-section and directly proportional to the length.
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Consider the hydrocarbon below. 2 carbons are double-bonded to each other; the pair are single bonded to h above left, above right, below right, and below left. what is the name of this hydrocarbon? propene pentene butene ethene
Answer:
[tex] \textbf{ \huge\boxed{ \sf ETHENE}}[/tex]
Explanation:
As the above statement says two carbon atoms are bonded to each other with double bond, the suffix used for double bond is -ene & the prefix for two carbon atoms is eth- & it says four Hydrogen atoms are attached to carbons, 2 Hydrogens to each carbon above & below.
When we draw the structural formula it comes out that the molecule is ethene.
Look at image for more clarification
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Many people in the world don't have access to clean drinking water. What may be the cause of this?
Answer:
Climate change and an increase in unpredictable and extreme weather is a growing challenge. Long periods of drought affect clean water supplies while flooding can pollute clean water sources and cause outbreaks of disease.
Answer:
could be areas they live in
1400 J of heat energy is added to a sample of iron. The temperature of the sample
rose from 16 C to 20 C. How many moles of iron were used?
Answer: 14.24
Explanation:
Scientific Method
Vocabulary
To notice similarities or differences
Answer:
The first step would be searching for your scientific vocabulary the second step is to write it down and then that would be your answer.
Explanation:
Hope this helps!
Black holes cannot be seen. However scientists think that black holes exist because of their effect on surrounding matter. Describe another force or phenomenon that cannot be seen directly. Give examples of the effects of this force on everyday objects.
BTW this is not the right subject but there is no astronomy category so I am using this subject.
Answer:
If Black Holes Are "Black," How Do Scientists Know They Are There? A black hole can not be seen because strong gravity pulls all of the light into the middle of the black hole. But scientists can see how the strong gravity affects the stars and gas around the black hole.
Explanation:
some examples; 1. Pushing a wheel barrow.
2. Opening or closing a door.
3. Squeezing wet clothes.
4. Gravitational force.
5. Brakes applied to stop a moving vehicle.
6. A football kicked harder that decreases due to the frictional force.
7. Rubbing a glass rod with a silk.
8. Pressure applied on a pin of a notice board.
9. Running
10. Pushing
Supernova or void is another force or phenomenon that cannot be seen directly similar to black holes.Examples of the effects are gravitational force, brakes applied to stop a moving vehicle.
What is force?Force is defined as a cause which is capable of changing the motion of an object. It can cause an object which has mass to change it's velocity. It is also simply a push or a pull . It has both magnitude as well as direction.Hence, it is a vector quantity.
It has SI units of Newton and is represented by'F'.Newton's second law states that force which acts on an object is equal to momentum which changes with time. If mass of object is constant, acceleration is directly proportional to net force acting on an object.
The concepts which related to force are thrust and torque .Thrust increases the velocity of an object and torque produces change in rotational speed of an object.
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PLEASE HELP DUE IN 15!!!!!!!!!!!! WILL GIVE BRAINLIEST!!
Question 17: 2C2H6 + 7O2 ---> 4CO2 + 6H20
How many moles of O2 are needed to completely react with 4.50 moles of C2H6 according to the above equation?
a. 5.8 moles
b. 3.11 moles
c. 1.29 moles
d. 63.0 moles
Explanation:
n=,4.5 moles C2H6
the ratio 2:7
4.5:x
x=15.75 moles
What is the intermediate, catalyst, and rate determining step? And what do we call this set of reactions?
Which of the following has the highest pH?
Multiple choice question.
A)
pure water
B)
vinegar
C)
ammonia
D)
vitamin C
Answer:
C Ammonia
Pure water is neutral, so pH is about 7
Vinegar is acidic, pH is around 2-3
Ammonia is alkaline, pH around 11.6
Vitamin C is also acidic, pH is around 3.5 to 6
As pH increases with how alkaline the substance is, substances with a lower pH is more acidic, while substances with a higher pH is more alkaline
the question is asking for the highest pH, so you should choose the most alkaline substance
therefore the ans is C, which is ammonia
In which state of the following compounds does nitrogen have the most positive oxidation state? group of answer choices no2 nano2 hno3 n2o nh4cl
The compound nitrogen have most positive oxidation state is NO₂. The correct option is b.
What is oxidation state?The total number of electrons gained or lost by an atom in order to form a chemical bond with another atom.
The charge on an ion is equal to the sum of the oxidation states of all the atoms in the ion. A substance's more electronegative elements are given a negative oxidation state.
A positive oxidation state is assigned to the less electronegative element.
Thus, the correct option is b, NO₂.
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Over 100 existing elements are listed and classified on the ___
Answer:
the anser is the periodic table of the elements
Explanation:
If you took a cross-section of soil from your backyard, what would be the correct order of soil layers from top to bottom?
A. organic, topsoil, subsoil, parent rock, bedrock
B. bedrock, parent rock, subsoil, topsoil, organic
C. bedrock, subsoil, parent rock, organic, topsoil
D. topsoil, organic, subsoil, bedrock, parent rock
The correct order of the vertical cross-section of soil layers is organic, topsoil, subsoil, parent rock, and bedrock.
What is the soil profile?The soil profile is the vertical cross-section of soil from the top to the underlining bedrock layer.
Starting from the top, soil contains organic materials in the form of decomposing leaves, twigs, etc. Immediately after the organic materials lies the topsoil.
After the topsoil comes the subsoil, parent rock, and bedrocks respectively.
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Answer:
A organic, topsoil, subsoil, parent rock, bedrock
Explanation:
The purpose of hydrogenating unsaturated fats is to.
What volume of KI solution of concentration of 3 M would use to make 0.3L of KI solution of 1.25 M?
Taking into account the definition of dilution, a volume of KI solution of 0.125 L of concentration of 3 M would use to make 0.3L of KI solution of 1.25 M.
What is DilutionWhen it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution.
Dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.
In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.
A dilution is mathematically expressed as:
Ci×Vi = Cf×Vf
where
Ci: initial concentrationVi: initial volumeCf: final concentrationVf: final volumeInitial volumeIn this case, you know:
Ci= 3 MVi= ?Cf= 1.25 MVf= 0.3 LReplacing in the definition of dilution:
3 M× Vi= 1.25 M× 0.3 L
Solving:
Vi= (1.25 M× 0.3 L)÷ 3 M
Vi= 0.125 L
In summary, a volume of KI solution of 0.125 L of concentration of 3 M would use to make 0.3L of KI solution of 1.25 M.
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Science edpuzzle
All of the following describe a chemical change, EXCEPT…
Answer:
B
Explanation:
You might want to pick "A sound is created" No that answer is just fine. If you listen when sitting around a campfire, you might hear the crackling of what is burning. Burning is an excellent example of a chemical change. Wood becomes ash.
The answer is a change in the state of matter. (B). That need not indicate a chemical change. In fact, most of the time, a change in matter is a physical change.
Answer: B
Which statement best describes how those advancements are detrimental to the earth?
The detriment of these advancements to the Earth is that: the growing population is taxing Earth's resources which could lead to the extinction of many species.
The effect of science and technology.Various scientific discoveries and technological advances around the world have led to an exponential increase in Earth's population with no end of the growth in sight.
In conclusion, we can infer and logically deduce that the statement which best describes how these advancements are detrimental to the Earth is that the growing population is taxing Earth's resources and this may likely lead to the extinction of many species of organisms.
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If a reaction vessel initially contains an n2o4 concentration of 0. 0550 m at 500 k, what are the equilibrium concentrations of n2o4 and no2 at 500 k?
The equilibrium constant gives the relation between the product formation and the reactant used. The concentration of the dinitrogen tetroxide is 0.003 M, and nitrogen dioxide is 0.054 M.
What is the equilibrium constant?An equilibrium constant gives the conversion rate of the reactant of the chemical reaction into the products.
The reaction can be shown as,
[tex]\rm N_{2}O_{4} \rightleftharpoons 2NO_{2}\;\; \rm Kp = 4.5[/tex]
From the ICE table attached below, the concentrations are calculated as:
[tex]\begin{aligned}\rm Kp &= \rm \dfrac{[NO_{2}]^{2}}{N_{2}O{4}}\\\\4.5 &= \rm \dfrac {x^{2}}{(0.0550 - x)}\\\\\rm x^{2} &=\rm 4.5 (0.0550 - x)\end{aligned}[/tex]
Solving further,
[tex]\begin{aligned} \rm 0.2475 - 4.5 x &= \rm x^{2}\\\\\rm x^{2} + 4.5 x - 0.2475 &= 0\\\\\rm x &= 0.054\end{aligned}[/tex]
Therefore, the concentration of nitrogen dioxide is 0.054 M and dinitrogen tetroxide is 0.003 M.
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A fishing line that snaps due to the inability to hold the weight of the fish at the other end. What kind of forces could be exerting on the fishing line and where are the sources of force coming from?
The force that causes a fishing line to snaps due to the inability to hold the weight of a fish is called the Tension Force
Meaning of Tension force and how it affects a fishing line
A tension force is a force that acts upon a surface, material and a line. It acts on a line as a result of a force that causes the line to stretch.
Tension acts on the two ends of a line, it can be said to be an action and reaction force.
Tension acting on a fishing line comes from the fisherman and the fish to be caught. The tension meets at the middle of the line and when the line is not strong enough to hold such amount of force it snaps.
In conclusion, The force that causes a fishing line to snaps due to the inability to hold the weight of a fish is called the Tension Force
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Which diagram shows the correct electron configuration for nitrogen (N)?
A group of five short lines. The first line has an up and a down arrow above it and is labeled 1 s below. The second line has an up and a down arrow and is labeled 2 s. The third arrow has an up and a down arrow; the fourth has an up arrow only, and the third has no arrows. The third, fourth, and fifth lines are bracketed with the label 2 p.
A group of five short lines. The first line has an up and a down arrow above it and is labeled 1 s below. The second line has an up and a down arrow and is labeled 2 s. The third, fourth, and fifth lines each have an up arrow and are bracketed with the label 2 p.
A group of five short lines. The first line has an up and a down arrow above it and is labeled 1 s below. The second line has an up and a down arrow and is labeled 2 s. The third and fourth lines each have an up arrow; the fifth line has a down arrow. The third, fourth, and fifth lines are bracketed with the label 2 p.
Answer:
the second one is the correct answer
Answer:
its b
Explanation:
Predict the vapor pressure of a solution of 261 ml of glycerol, in 379 ml of water, at the normal boiling point of water
The vapour pressure of the solution of glycerol is 106.4 torr.
What is vapour pressure?The vapour pressure is given as the pressure extered by the individual sample in a solution. According to Roult’s law, the vapour pressure of mixture is given as:
[tex]\rm Vapor\;pressure\;of\;solution=moles\;of\;solute\;\times\;vapour\;pressure\;of\;pure\;solvent[/tex]
The density of glycerol is 1.25 g/mL. The mass of glycerol in 261 mL will be:
[tex]\rm Density=\dfrac{mass}{volume}\\\\1.25\;g/mL=\dfrac{mass}{261\;mL}\\\\Mass =326.25\;g[/tex]
The moles of glycerol are given as:
[tex]\rm Moles=\dfrac{mass}{molar\;mass}\\\\Moles=\dfrac{326.25}{92.09\;g/mol}\\\\Moles=3.54\;moles[/tex]
The density of water is 1, thus the mass of 379 mL water is 379 grams. The moles of solvent are:
[tex]\rm Moles=\dfrac{379}{18\;g/mol}\\\\Moles=21.05\;moles[/tex]
The mole fraction of solute is given as:
[tex]\rm Mole \;fraction=\dfrac{moles\;of\;solute}{moles\;of\;solute\;+\;moles\;of\;solvent}\\\\Mole\;fraction=\dfrac{3.54}{3.54+21.05}\\\\Mole\;fraction=0.14[/tex]
The mole fraction of solute is 0.14. The vapour pressure of pure water at boiling point is equivalent to the atmospheric pressure i.e. 760 torr.
Substituting the values in Roult’s law, the vapour pressure of solution is given as:
[tex]\rm Vapor\;pressure=0.14\;\times\;760\;torr\\Vapor\;pressure=106.4\;torr[/tex]
The vapour pressure of the solution of glycerol is 106.4 torr.
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a 2.00l flask was filled with 4.00 mol of hi at a certain temperature and given sufficient time to react. at equilibrium the concentration of h2 was 0.400 m. find the equilibrium concentrations of i2 and hi and then find the keq at this temperature. 2hi(g) <==> h2(g) + i2(g)
From the calculations and data, the equilibrium constant is 16.
What is equilibrium?The term equilibrium refers to the state in which the rate of forward reaction and the rate of reverse reaction becomes equal.
Setting up the ICE table
Concentration of HI = 4.00 mol /2.00l = 2 M
Concentration of H2 and I2 = 0.4 M
Hence;
2HI <==> H2(g) + I2(g)
I 2 0 0
C -x +x +x
E 2 - x 0.4 0.4
Hence x = 0.4
[HI]eq =
2 - 0.4 = 1.6
Keq = (1.6)^2/(0.4)^2 = 2.56/0.16 = 16
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Solve to me this question
Explain 3 factors which you must consider in preferential discharge
Answer:
Factors that determine preferential discharge of ionsFactors Affecting the Preferential Discharge of Ions in Electrolysis
1. The position of ion in electrochemical series.2. The concentration of the ion.3. The nature of the electrode.4. Relationship between the position of ions in the electrochemical 5. Concentration of the ions in the electrolyte.
_______, ________, and ________ are renewable resources.
biomass energy, hydropower, and wind energy
biomass energy, coal energy, and wind energy
hydropower, coal energy, and wind energy
biomass energy, hydropower, and coal energy
Answer:biomass energy, hydropower, and wind energy
Explanation:
Select the correct structure that
corresponds to the name. Please help me asap
Answer:
Option A
Explanation:
Option A
7 carbon atoms bonded with a single bondIUPAC name for 7 is "hept"⇒ heptaneOption B
CH₃ - CH₂ - CH₂ - CH₂ - CH₂ - CH₃6 carbon atoms bonded with a single bondIUPAC name for 6 is "hex"⇒ hexaneOption A is the correct answer.
What is the ratio of urms to ump for a certain gas at a given temperature?
The relative ratio, uav : ump : urms of a gas at a given temperature is 56 / 22 : 2 : 3.
What is temperature?Temperature is the measurement of hotness or coldness of a body. It shows the direction of flow of heat.
The relative rate (RR), also known as a rate ratio, is the ratio of the disease or death incidence rate in the exposed group to the disease or death incidence rate in the unexposed group.
Thus, the relative ratio, uav : ump : urms of a gas at a given temperature is 56 / 22 : 2 : 3.
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