Answer:
Each of two or more compounds with the same formula but a different arrangement of atoms in the molecule and different properties.
Explanation:
In a coffee-cup calorimeter, 1.60 g of NH4NO3 was mixed with 75.0 g of water at an initial temperature of 25.008C. After dissolution of the salt, the final temperature of the calorimeter contents was 23.348C.
Required:
a. Assuming the solution has a heat capacity of 4.18 J 8C21 g21, and assuming no heat loss to the calorimeter, calculate the enthalpy of solution (DHsoln) for the dissolution of NH4NO3 in units of kJ/mol.
b. If the enthalpy of hydration for NH4NO3 is 2630. kJ/mol, calculate the lattice energy of NH4NO3.
Answer:
Explanation:
mass of the solution m = 1.6 + 75 = 76.6 g
fall in temperature = 25 - 23.34 = 1.66°C
heat absorbed = mass x specific heat x fall in temperature
= 76.6 x 1.66 x 4.18
= 531.5 J .
= .5315 kJ .
mol weight of ammonium nitrate = 80 g
heat absorbed by 1.6 g = .5315 kJ
heat absorbed by 80 g or one mole = 26.575 kJ
enthalpy change ΔH = +26.575 kJ
b )
enthalpy of hydration = 2630 kJ / mol
lattice energy = enthalpy of hydration + enthalpy change
= 2630 + 26.575
= 2656.575 kJ .
Please help I will give brainiest
Answer:
Answer
Answer is option B coz da negative charge r more thn positive
Answer:
B.
Explanation:
On the hand in the option B there are 3 positive and 5 negative signs so the answer is B.
What can element automatic number tell you about its state of matter
Answer:
Identifies the number of protons a single atom of the element contains.
Explanation:
The atomic number helps people identify elements according to the number of protons one atom of the element has. It essentially defines the element.
While having a neutral charge, it also provides the number of electrons the element has (in one atom).
Identify the necessary parts to build a calorimeter. Select one or more:________ A. Cover. B. An interior paper cup. C. Thermometer. D. An interior styrofoam cup. E. An exterior paper cup An exterior styrofoam cup Conductivity probe.
Answer:
Explanation:
A calorimeter is an instrument used for measuring the heat of reactions and heat capacity. A calorimeter should contain an insulating cover, a thermometer, styrofoam cups (you could have that both on the inside and the outside in the case of a styrofoam calorimeter) and you could also have a conductivity probe (in the form of ignition wires and bulb).
A calorimeter is the analytical device used to measure the heat of the reaction. The construction of calorimeter requires cover, paper cup, thermometer, styrofoam cup, and conductivity probe.
How to build a calorimeter?In a chemical reaction, the amount of heat released or absorbed by the reaction helps in the analysis of various parameters. The calorimeter measures the heat of the reaction.
The construction of a calorimeter requires:
Paper can for the filling of water.Cover to stop the loss of heatStyrofoam cup to allow the reactionThermometer to measure the change in temperatureConductivity probe to allow the transfer of heat energyLearn more about calorimeter, here:
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What is the density of an object with a volume of 3ml and a mass of 18 grams
Answer:
The answer is 6 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question we have
[tex]density = \frac{18}{3} \\ [/tex]
We have the final answer as
6 g/mLHope this helps you
Which of the following descriptions best describes a weak base?
A. a base that dissociated completely in water
B. a base that generates a lot of hydroxide ions in water
C. a base that has very low concentration in water
D. A base that dissociates only slightly in water
Answer:
umm.. B. a base that generates a lot of hydroxide ions in water.
The descriptions best describes a weak base is a base that dissociates only slightly in water.
What are bases?Bases are those substances which react with acids to neutralize them, generally bases are the compounds of oxides, hydroxides and carbonates of metal elements.
Bases shows dissocation in the aqueous soluition and pH of bases ranges from 7 to 14. Strong bases shows full dissociation into ions and having higher pH values and weak bases shows partial dissociation into ions & having lower pH values.
Hence, option (D) is correct.
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In the reaction of aluminum metal and oxygen to make aluminum oxide, how many grams of oxygen gas will react with 2.2 moles aluminum metal?
Answer:
52.8 g of O2.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
4Al + 3O2 —> 2Al2O3
From the balanced equation above,
4 moles of Al reacted with 3 moles of O2 to produce 2 moles of Al2O3
Next, we shall determine the number of mole of O2 needed to react with 2.2 moles of Al. This can be obtained as follow:
From the balanced equation above,
4 moles of Al reacted with 3 moles of O2.
Therefore, 2.2 moles of Al will react with = (2.2 × 3)/4 = 1.65 moles of O2.
Thus, 1.65 moles of O2 is needed for the reaction.
Finally, we shall determine the mass of O2 needed as shown below:
Mole of O2 = 1.65 moles
Molar mass of O2 = 2 × 16= 32 g/mol
Mass of O2 =?
Mole = mass/Molar mass
1.65 = mass of O2 /32
Cross multiply
Mass of O2 = 1.65 × 32
Mass of O2 = 52.8 g
Therefore, 52.8 g of O2 is needed for the reaction.
a student performed an experiment, using a cocktail peanut, before it was burned the peanut half weighed .353 g. After burning the residue weighed .016 g. The energy released by the conjunction increased the temperature of 200. mL of water in the calorimeter by 7.2 degrees Celsius. Calculate the mass of peanut consumed in the combustion.
Suppose 0.363 g of barium acetate is dissolved in 100. mL of a 25.0 m M aqueous solution of ammonium sulfate. Calculate the final molarity of barium cation in the solution. You can assume the volume of the solution doesn't change when the barium acetate is dissolved in it. Be sure your answer has the correct number of significant digits.
Answer:
Molarity of Ba²⁺ is 0M
Explanation:
Some barium ion, Ba²⁺ is produced when barium acetate is dissolved (Moles of barium acetate = moles of Ba²⁺ in solution). Then, Ba²⁺ reacts with sulfate ion to produce BaSO₄, an insoluble salt. The concentration of Ba²⁺ is the initial concentration - the concentration of SO₄²⁻ in solution.
Initial moles of Ba²⁺:
Moles barium acetate (Molar mass: 255.43g/mol)
0.363g * (1mol / 255.43) = 1.421x10⁻³ moles of Ba²⁺
Moles SO₄²⁻ = Moles of ammonium sulfate:
100mL = 0.100L * (0.025mol / L) = 2.5x10⁻³ moles of SO₄²⁻.
As moles of SO₄²⁻ are higher than moles of Ba²⁺, Molarity of Ba²⁺ is 0M because all moles of Ba²⁺ reacts producing BaSO₄(s), an insoluble salt.
Aluminum metal reacts with hydrochloric acid according to the following equation:
2 A l left parenthesis s right parenthesis plus 6 H C l left parenthesis a q right parenthesis rightwards arrow 2 A l C l subscript 3 left parenthesis a q right parenthesis plus 3 H subscript 2 left parenthesis g right parenthesis
If 28.1 grams of aluminum reacts with 46 mL of a 1 M HCl solution, how many grams of AlCl3 will be generated? Hint: You must determine the limiting reactant
Answer:
18 g
Explanation:
Step 1: Write the balanced equation
2 Al + 6 HCl ⇒ 2 AlCl₃ + 3 H₂
Step 2: Calculate the moles of Al
The molar mass of Al is 26.98 g/mol.
28.1 g × 1 mol/26.98 g = 1.04 mol
Step 3: Calculate the moles of HCl
46 mL of 1 M HCl react.
0.046 L × 1 mol/L = 0.046 mol
Step 4: Determine the limiting reactant
The theoretical molar ratio of Al to HCl is 2:6 = 0.33:1.
The real molar ratio of Al to HCl is 1.04:0.046 = 22.6:1
According to this, the limiting reactant is HCl.
Step 5: Calculate the mass of AlCl₃ generated from 0.046 moles of HCl
The molar ratio of HCl to AlCl₃ is 6:2. The molar mass of AlCl₃ is 133.34 g/mol.
0.046 mol HCl × 6 mol HCl/2 mol AlCl₃ × 133.34 g AlCl₃/1 mol AlCl₃ = 18 g AlCl₃
Which statement is true?
Adding energy can change a liquid to a solid.
Solids have no movement of molecules.
Liquids do not have a set volume.
Gases can be compressed to change their volume.
An electron in the first energy level of the electron cloud has
an electron in the third energy level.
Answer: A LOWER ENERGY
Explanation:
did the test
Answer:
A lower energy!
Explanation:
I know this is not much of an explanation but I took the test i hope you have an amazing day afternoon or night! Hope this helps :3
The sun shines more directly near the equator, bringing more warmth there. In polar regions the sun shines at angles such that
they get little or no sunlight during the winter, causing colder temperatures. Predict how these differences in temperature create a
movement in the atmospheric gases and distribute heat energy from the sun across the planet.
A)
B)
As air in one region diffuses, it becomes less condensed than the
surrounding air and begins to rise and draws more air along.
As air in one region warms, it becomes less dense than the surrounding air
and begins to rise and draws more air in underneath.
As air in one region warms, it becomes less nebulous than the surrounding
air and begins to descend and draws more air in with it.
As air in one region cools, it becomes less compact than the surrounding
air and begins to accelerate and draws more air in supportively.
C)
D)
Answer:Because the Earth is round and not flat, the Sun's rays don't fall evenly on the land and oceans. The Sun shines more directly near the equator bringing these areas more warmth. However, the polar regions are at such an angle to the Sun that they get little or no sunlight during the winter, causing colder temperatures.
Explanation:
True or false?
An apple, potato, and onion all taste the same if you eat them with your nose plugged.
Answer:
Its true I think but I may be wrong lol
Answer:
An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged An apple, potato, and onion all taste the same if you eat them with your nose plugged
Explanation:
y e s
Help for chem/physics
Answer:
first and 3rd are ur answers
If 35.00 mL of 3.00 M KOH reacted completely (according to our equation), what mass of aluminum has reacted?
Answer:
Explanation:
25 Mass
The mass of the aluminum that has reacted is equal to 2.84 grams.
What is the balanced chemical equation?A chemical equation of a reaction contains of reactants, formed products, and an arrow indicating the direction of the given reaction. The balanced chemical equation in which the number of atoms is equal on either side of the equation. The law of conservation of mass should be followed by a balanced equation.
The chemical equation of the reaction of the KOH and Al is :
[tex]Al + KOH + H_2O \longrightarrow KAl(OH)_4 + H_2[/tex]
From the above equation, we can say that one mole of aluminum is reacting with one mole of KOH.
Given the volume and concentration of KOH are 35 ml and 3.0 M.
The moles of KOH = 3 × 0.035 = 0.105 mol
Therefore, the moles of Al will react = 0.105 mol
The mass of Al will react with KOH = 0.105 × 27 = 2.84 g
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A solution is known to contain either Ni2 or Cr3 . Addition of what single (1 only) reagent would identify which ion is present?
Answer:
Explanation:
From the periodic table; both elements given are from the same group 3.
To test for which ion will be present in the experiment;
We added 6M aqueous sodium hydroxide in excess.
This process is followed by the addition of hydrogen peroxide H2O2 while stirring.
Heat is then applied to the solution.
After we've carried out those process;
We will notice the following;
If[tex]Ni^{2+}[/tex] is present, then a green [tex]NI(OH)_2[/tex] precipitate will be formed
If [tex]Cr^{3+}[/tex] is present,then a yellow-colored [tex]CrO^{2-}_{4}[/tex] will be formed.
Question 3. Starting with acetylene
, devise a scheme to prepare 1-chloroheptanol
. There is more
than one way to complete this synthesis
. It can be completed in as few as three reactions. You
can use any alkyl halides as needed as sources of carbon atoms. PLEASE EXPLAIN THE PROCESS. I’m begging. Please.
Answer:
See explanation and image attached
Explanation:
Starting from acetylene, we can react the substrate with methyl iodide in the presence of sodamide and ammonia. We then obtain propyne which then undergoes a similar reaction using butyl iodide to yield 2-heptyne.
This may now be reduced using hydrogen and platinum to yield heptane. Heptane is chlorinated in the presence of light to yield a mixture of products of which 1-chloroheptane is one.
How do the chemical reactions in this lab activity compare to nuclear reactions, such as fission and fusion?
The chemical reaction has been the low energy reaction containing electrons rearrangement, while nuclear reactions have been the higher energy reactions with change in nuclei.
What are nuclear reactions ?The term nuclear reactions is defined as when there has been the including the change in the nuclei of the atom. However, the reaction has been known as the chemical reaction when the change has been processed in the electrons with the rearrangement.
The nuclear reactions have made up of a more amount of energy to be liberated, while the amount of energy included in the chemical reaction has been smaller.
Thus, the chemical reaction has been the low energy reaction including electrons rearrangement, while nuclear reactions have been the high energy reactions with change in nuclei.
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A student wants to use cookies to make a model of the genetic makeup of the offspring of asexual reproduction. He has vanilla cookies and chocolate cookies available. How can he make his model?
A.
Put chocolate cookies in a row with arrows between them showing the progression from parent to offspring.
B.
Use one chocolate cookie parent with arrows showing that it produces vanilla cookies and chocolate cookies as offspring.
C.
Use chocolate cookies and vanilla cookies as the parents, and vanilla cookies and chocolate cookies as the offspring.
D.
Use chocolate cookies and vanilla cookies as parents, and combine half a vanilla cookie and half a chocolate cookie for the offspring.
Answer:
i am not sure but it seems D is the best
Answer:
A
Explanation:
It seems to be the most logical. My reasoning is that for B when it uses one parent cookie that produced genetically different offspring. That is what makes it incorrect. The other two options involve two parents which means that the reproduction would be sexual. A. would be the closest to the answer.
Please let me know if this is correct! Hope it helped.
net ionic equation of HF(aq)+RbOH(aq)=H2O(l)+RbF(aq)
net ionic equation
H⁺(aq)+OH⁻(aq)⇒H₂O(l)
Further explanationThe electrolyte in the solution produces ions.
The equation of a chemical reaction can be expressed in the equation of the ions
For strong electrolytes (the ionization rate = 1) is written in the form of separate ions, while the weak electrolyte (degree of ionization <1) is still written as an un-ionized molecule
In the ion equation, there is a spectator ion that is the ion which does not react because it is present before and after the reaction
When these ions are removed, the ionic equation is called the net ionic equation
For gases and solids including water (H₂O) can be written as an ionized molecule
So only the dissolved compound is ionized ((expressed in symbol aq)
Reaction
HF(aq)+RbOH(aq)⇒H₂O(l)+RbF(aq)
ionic equation
H⁺(aq)+F⁻(aq)+Rb⁺(aq)+OH⁻(aq)⇒H₂O(l)+Rb⁺(aq)+F⁻(aq)
net ionic equation
H⁺(aq)+OH⁻(aq)⇒H₂O(l)
what is the fractional distillation
Lying in bed you notice that you get cold every time your brother opens the door. This is most closely associated with which step in the scientific method?
Answer:
Making an observation100% sure about that....just believe me
Hope u the best and hope that helps
Consider the following equations: 3A + 6B â 3D ÎH = â418 kJ E + 2F â A ÎH = â118.2 kJ C â E + 3D ÎH = â60.8 kJ Suppose the first equation is reversed and multiplied by 1/6, the second and third equations are divided by 2, and the three adjusted equations are added. What is the net reaction and what is the overall heat of this reaction?
Answer:
The net reaction is:
1/2 C + F + → A + B D
The overall heat of this reaction = 40.96 kJ
Explanation:
Given that:
3A + 6B → 3D ΔH = -418 kJ
E + 2F → A ΔH = -118.2 kJ
C → E + 3D ΔH = 60.8 kJ
The first process says we should reverse the first equation and multiply it by 1/6
i.e.
3D × 1/6 → 3A × 1/6 + 6B × 1/6 ; ΔH = +1/6 × 418 kJ
1/2D → 1/2 A + B ; ΔH = 69.66 kJ
Then the second and the third equation are divided by 2
1/2 × E + F → 1/2 A ; ΔH = -1/2 × 118.2 kJ
1/2C → 1/2 E + 3/2 D ; ΔH = 1/2 × 60.8 kJ
By adjusting the three equations together; we have:
1/2D → 1/2 A + B ; ΔH = 69.66 kJ
1/2 × E + F → 1/2 A ; ΔH = -59.1 kJ
1/2C → 1/2 E + 3/2 D ; ΔH = 30.4 kJ
1/2C + F → A + B + D ; ΔH = (69.66 - 59.1 + 30.4) kJ
ΔH = 40.96 kJ
The net reaction is:
1/2 C + F + → A + B D
The overall heat of this reaction = 40.96 kJ
How something works is related to its structure
Answer:
Forms and Functions
Explanation:
It refers to the direct relationship between the structure of a thing and the way it functions.
If a horse travels 20 meters in 5 seconds what is the horses speed
distance = speed * time
speed = distance / time
speed = 20 meters / 5 seconds
speed = 4 meters / second
hope this helped!
What is the kinetic energy of a ball with a mass of 0.5 kg and a velocity of 10 m/s? (Formula:) 25 J 5 J 50 J 100 JWhat is the kinetic energy of a ball with a mass of 0.5 kg and a velocity of 10 m/s? (Formula:) 25 J 5 J 50 J 100 J
Answer:
25J
Explanation:
K.E = 1/2mv^2
= 1/2*0.5*10^2
= 25J
The kinetic energy of the ball is 25 J
What is kinetic energy?Kinetic energy can be defined as the energy possessed by an object in motion. Mathematically, it can be expressed as:
KE = ½mv²
How to determine the kinetic energyFrom the question given above, the following data were obtained:
Mass (m) = 0.5 KgVelocity (v) = 10 m/sKinetic energy (KE) =?KE = ½mv²
KE = ½ × 0.5 × 10²
KE = 0.25 × 100
KE = 25 J
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visible light with a wavelength of 4.7x10^-7 meters will have a frequency of ....
The visible light with a wavelength of 4.7x10^-7 meters will have a frequency of 0.67 × 10¹⁵ Hz.
What do you mean by wavelength ?The term wavelength is defined as the distance between two successive crest and two successive trough. Wave length is represented by the symbol "λ" (lambda). The formula of wavelength is given by equation as follows:
λ = ν × f
So, the distance between either one crest or trough of one wave and the next wave is known as wavelength.
Wavelength relates to frequency as follows:
λ = ν × f
Where,
λ = Wavelength of light
ν = speed of light
f = frequency of light
We have
λ = 4.7x10^-7 meters
F = ?
ν = 3 × 10⁸ m/s
By substituting this values in given equation we get,
λ = ν × f
f = 3 × 10⁸ / 4.7x10^-7
f = 0.67 × 10¹⁵ Hz
Thus, visible light with a wavelength of 4.7x10^-7 meters will have a frequency of 0.67 × 10¹⁵ Hz.
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What is the hybridization state on the central N atom in the azide ion, N3−?
Which definition best describes the term activation energy?
a) the energy required to remove an electron from a gaseous atom
b) the minimum kinetic energy that particles must possess for a chemical reaction to occur
c) the energy of motion
d) the energy required to separate ions in a crystalline solid
Answer:
B
Explanation:
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