It should be noted that when a reaction is occurring in a test tube, heat transmitted to the surroundings when Molecules collide with the glass, and the glass molecules then transmit that energy to the outside.
What is heat?Heat can be regarded as a form of energy which is energy that is been transferred as a result of difference in temperature.
In the case above, Molecules collide with the glass, and the glass molecules then transmit that energy to the outside which is an exothermic reaction.
Therefore, option B is correct.
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How many molecules of co2 are in a 500. 0 ml container at 780 mm hg and 135°c? 8. 76 × 1021 molecules 9. 23 × 1021 molecules 5. 50 × 1021 molecules 2. 65 × 1022 molecules 2. 79 × 1022 molecules.
Step 1:
ok we have to use the formula PV=nRT
p=Pressure (must be converted to atm)= 780 mmHg
1 amt= 760 mmHg use this as a conversion factor
780 mmHg (1 atm/760 mmHg)= 1.026
V= Volume= 5.00 mL = o.5 L
n=number of moles which we have to find first
R= 0.0821
T(convert to Kelvins by adding 273.15 to the celsius temperature)= 135 C + 273.15= 408.15 k
Now plug in->
(1.026 atm)(o.5 L)= n(0.0821)(408.15 K)
(1.026 atm)(0.5 L)= n(33.509115)
(0.513)= n(33.509115)
n(number of moles)= 0.01532 mol
Now we have to convert to moles using Avagodro's number which states that 1 mol = 6.022 x 10^23 molecules or atoms
So 0.01532 mol (6.022 x 10^23 number of molesules)/ (1 mol) = 9.225704 x 10^21 = 9.226 x 10^21 colecules
Step 2
You must transfer pressure into pascals, 780 mm Hg = 103991 Pa
135*C = 408.15 k
then from the equation pV = nRt
n = pV / RT (T in Kelvins, V in M^3)
n = 103991 x 500 x 10^-6 / (8.314 x 408.15)= 0.015322 moles of N2
1 mol of everything is 6.022 x 10^23 particles, so 0.15322 moles is 0.15322 x 6.022 x 10^23 = 9.2269084 x 10^21 molecules
Explanation:
Hope this helps :)
Which statement explains what it means for a chemical reaction to be at equilibrium? (1 point)
O The masses of the products and reactants are equal.
O The reactions stop because of a lack of reactants.
O The rate of the forward and backward reactions are equal.
o The reactions stop because the system can no longer carry more products.
Answer: I would say c
Explanation:
A chemical reaction is said to be at equilibrium when the rate of the forward and backward reactions are equal.
Chemical reaction at equilibriumChemical reaction is the combination of two or more substances called reactants to form products.
A chemical reaction can exist in equilibrium when the rate of the forward and backward reactions are equal.
Forward reactions are reactions in which products are produced from reactants and it goes from left to right in a reversible reaction.
Backward reaction is when reaction goes from products to reactants.
Therefore a reaction is said to be at equilibrium when the rate of formation of products is the same as the rate of formation of reactants in a reversible reaction.
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Methyl hydrazine (N2H3CH3) is a common liquid propellant used in rocket fuels. Look for the standard molar enthalpies of formation of the reactants and products. Calculate the ∆H˚ for the reaction per mole of N2H3CH3.
4N2H3CH3(l) + 5N2O4(l) → 12H2O(g) + 9N2(g) + 4CO(g)
The standard enthalpy of reaction of the given reaction is -865.71 kJ per mole of N₂H₃CH₃.
What is the standard molar enthalpy of formation?The standard molar enthalpy of formation of a compound is defined as the enthalpy of formation of 1.0 mol of the pure compound in its stable state from the pure elements in their stable states at P = 1.0 bar at a constant temperature.
Let's consider the following equation.
4 N₂H₃CH₃(l) + 5 N₂O₄(l) → 12 H₂O(g) + 9 N₂(g) + 4 CO(g)
We can calculate the standard enthalpy of the reaction using the following expression.
ΔH° = Σnp × ΔH°f(p) - Σnr × ΔH°f(r)
where,
ΔH° is the standard enthalpy of the reaction.n is stoichiometric coefficient.ΔH°f is the standard molar enthalpy of formation.p are the products.r are the reactants.ΔH° = 12 mol × ΔH°f(H₂O(g)) + 9 mol × ΔH°f(N₂(g)) + 4 mol × ΔH°f(CO(g)) - 4 mol × ΔH°f(N₂H₃CH₃(l)) - 5 mol × ΔH°f(N₂O₄(l))
ΔH° = 12 mol × (-241.81 kJ/mol) + 9 mol × (0 kJ/mol) + 4 mol × (-110.53 kJ/mol) - 4 mol × (54.20 kJ/mol) - 5 mol × (-19.56 kJ/mol)
ΔH° = -3462.84 kJ
In the balanced equation, there are 4 moles of N₂H₃CH₃. The standard enthalpy of reaction per mole of N₂H₃CH₃ is:
-3462.84 kJ / 4 mol = -865.71 kJ/mol
The standard enthalpy of reaction of the given reaction is -865.71 kJ per mole of N₂H₃CH₃.
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Ex 1) 45.2 g of Zn = _____ moles Zn
Ex 2) 0.568 moles Ag = _____ grams Ag
the molar mass of Zn is 65
number of mole(n)=reacting mass/molar massn=45.2/65=0.70g/mol2.the molar mass of Ag is 108
0.568=m/108then cross multiplym=0.568×108m=61.3gsomeone plz help i will mark brainliest
Answer: The answer is C.) NH3
Explanation:
Ammonia is a covalent compound because the nitrogen and hydrogen atoms are nonmetals in nature. Ammonia (NH3) is a covalent compound because the nitrogen and hydrogen atoms are nonmetals in nature, they don’t have any tendency of either accepting or donating the electrons but both nitrogen and hydrogen atoms have a tendency to share their valence electron with each other.
Hope this helps mark brainliest please :)
how does sticky notes work ?
Answer:
sticky notes will open where you left them in the list of notes Tao or double click a notes to open it or from the keyboard press ctrl+n to start a new note to close a note tap or double click the class icon (x)
which element has the largest atom phosphorus, sulfur, chlorine, or fluorine
Answer:
Chlorine
Explanation:
It has the greatest mass out of the elements listed
What volume of 6.00 M hydrochloric acid is required to make 0.50 L of 0.20 M solution of hydrochloric acid
Answer:
16.7 mL of 6.0 M HCl
Explanation:
Identify the combination reaction. 2H 2 O 2 ⟶ 2H 2O Cl 2 2KBr ⟶ 2KCl Br 2 Al 2S 3 ⟶ 2Al 3S C 4H 12 7O 2 ⟶ 6H 2O 4CO 2.
Answer:
Option 1
Explanation:
Here the formation of water is shown
[tex]\\ \tt\bull\rightarrowtail H_2+O_2\longrightarrow H_2O[/tex]
Hydrogen and oxygen combine together to form water.
What nucleophile could be used to react with butyl iodide to prepare the compound shown?.
The nucleophile used to react with butyl iodide to form te compound below is :
CH₃CH₂O⁻What is a NucleophileA Nucleophile is a molecule in a chemical reaction that seeks for a positive center of the reaction ( i.e. nucleus ) and this is because of the presence of a electron pair in the Nucleophile.
Given the compound expressed in the question the chemical reaction that takes place between the nucleophile and butyl iodide is called Nucleophilic substitution reaction.
Hence we can conclude that the nucleophile that could be used to react with butyl iodide is CH₃CH₂O⁻
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Attached below is the complete question
Consider the following intermediate chemical equations. 2 equations. First: upper C (s) plus one half upper O subscript 2 (g) right arrow upper C upper O (g). Second: upper C upper O (g) plus one half upper O subscript 2 (g) right arrow upper C upper O subscript 2 (g). How will oxygen appear in the final chemical equation? Upper O subscript 2 (g). As a product Upper O subscript 2 (g). As a reactant O(g) as a product 2O(g) as a reactant.
Answer:
34.2
Explanation:
Bc it is the loser one to it
The oxygen in the final equation appears as reactant Upper O subscript 2 (g). Thus, option A is correct.
The chemical equations are the representation of the chemical formula involved in the equation as the reactant and the formed product.
What will be the form of oxygen?The given chemical equations are:
[tex]\rm C\;(s)\;+\;\frac{1}{2}\;O_2\;(g)\rightarrow\;CO\;(g)[/tex][tex]\rm CO\;(g)+\;\frac{1}{2}\;O_2\;(g)\rightarrow\;CO_2\;(g)[/tex]The final chemical equation formed for the formation of Carbon dioxide is the sum of the two equations.
The final equation is achieved by substituting equation 1 in equation 2.
[tex]\rm C\;(s)\;+\;\frac{1}{2}\;O_2\;(g)\;+\;\dfrac{1}{2}\;O_2\;(g)\;\rightarrow\;CO_2\;(g)\\\\ C\;(s)\;+\;O_2\;(g)\;\rightarrow\;CO_2\;(g)[/tex]
The oxygen in the final equation appears as reactant Upper O subscript 2 (g). Thus, option A is correct.
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Why do trees produce carbon dioxide (CO2) at night?.
Answer:
Because photosynthesis ceases due to the lack of sunlight.
Explanation:
Plants typically absorb CO2 and release oxygen, but they also “exhale” CO2, particularly at night, when photosynthesis ceases due to the lack of sunlight. Forests also emit more CO2 when they are stressed by increasing temperatures.
A sample of argon gas is cooled and its volume went from 380 mL to 250 20 points
ml. If its final temperature was -55°C, what was its original temperature?
Answer:
Applying the Laws of Thermodynamics we get as,
Explanation:
V1/T1 = V2/T2
According to the law of Gaseous states.
so we get as,
V1 = 380 ml, V2 = 250 ml, T2 = -55°C ==> 273-55 ==> 218 Kelvin.
so now substituting we get as,
380/ T1 =250/218
==> 380*(218) /250 = T1
==> T1 = 331.36 ===>T1 = 331 K approx
So the Original Temperature was 331 K,
Option 1.) is correct.
What is the hydrogen ion concentration of a solution with ph = 2. 25?.
Earths mantle is made of a dense thick material that allows movement of crystal plates. Crust plate movement occurs because the the mantle flows as a result of uneven heating inside the mantle. ________ are created by very hot material deep in the mantle rising then cooling sinking again and then heating again and then repeating the cycle
Answer:
Convection cells
How does the author communicate that a liquid is similar to a gas?
The author communicate that a liquid is similar to a gas due to its indefinite shape.
How liquid and gas are similar?Gas and liquid are similar in one property which is that gas and a liquid is able to flow and take the shape of a container due to indefinite shape but both are different from one another due to the presence of definite volume of liquid which is not the property of a gas so we can conclude that indefinite shape is the property of both liquid and gas.
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What effect does the speed of molecules have on matter?.
Answer:
An increase in the speed of the molecules competes with the attraction between molecules and causes molecules to move a little further apart. Cooling a liquid decreases the speed of the molecules.
Explanation:
Find the distance between two points rounding to the nearest tenth
(-7,-1) and (-4,3)
What adaptation does a tufted titmouse have that allows it to stay in a broadleaf forest year-round?
They eat mice for energy to warm themselves.
They fluff their feathers for warmth.
They hibernate for the winter.
They migrate for the winter.
Answer: They use their feathers
Explanation: They fluff their feathers for warmth I think so at least
Because I'm sure they stay in the forest and don't really hibernate
Answer:
They fluff there feathers for warmth
Explanation:
I did the test and got 100
What is the melting point of silver?
Answer:
If you are looking for a temperature then it would be 961.8 degrees Celsius
Explanation: Hope this helps<3
If you spill a liquid chemical, what is the first thing you should do?.
You have a sample of 75.6 g of C3H8. How many moles of C3H8 are in the sample?
Show all your work. Please use correct formatting for subscripts and exponents. The math formula editor makes it easier to show work.
Answer:
1.1782 moles
Explanation:
Number of moles of C3H8
= mass ÷ molar mass
= 75.6 g x [(3 x 12) + (8 x 1)]
= 75.6 g x 44
= 1.1782 moles
Which type of external structure would most help an animal to camouflage?
A fur
B strong legs
C keen eyes
D wings
Answer:
c
Explanation:
Answer:
a fur
Explanation:
I took the test
what effect does gravity have on stars?
Answer: creates the pressure to fuse atoms
Turn on show lewis diagram. What is the lewis diagram for hydrogen, h2.
Answer:
H:H
Explanation:
After finishing a lab, you have some chemicals left over. You do not want to waste
them, so you carefully pour them back into the container you got them from.
Answer:
Instead, pour a small amount into a beaker or clean weigh dish. Once you have added a chemical to a container, label it promptly. When you are finished with the experiment, dispose of the excess chemical as chemical waste. Do not simply pour the excess chemical down the sink.
Carbon reacts with oxygen to produce carbon dioxide (CO2 (g), Delta. Hf = –393. 5 kJ/mol) according to the equation below. Upper C (s) plus 2 upper O subscript 2 (g) right arrow upper C upper O subscript 2 (g). What is the enthalpy change of the reaction? Use Delta H r x n equals the sum of delta H f of all the products minus the sum of delta H f of all the reactants. –393. 5 kJ –196. 8 kJ 196. 8 kJ 393. 5 kJ.
The change in enthalpy for the reaction of carbon dioxide is -393.5 kJ/mol. Thus, option A is correct.
The change in enthalpy of the reaction is given by the energy of the product and the energy of reactant difference.
The chemical equation for the reaction is:
[tex]\rm C \;(s)\;+\;2\;O_2\;(g)\;\to\;CO_2\;(g)[/tex]
Computation for the enthalpy changeThe standard enthalpy change for carbon dioxide is -393.5 kJ/mol
The standard enthalpy change for oxygen is 0 kJ/mol
The change in enthalpy of reaction is given as:
[tex]\rm \Delta \textit H=CO_2-2\;\times\;O_2\\\Delta \textit H=-393.5\;kJ/mol-2\;\times\;0\;kJ/mol\\\Delta \textit H=-393.5\;kJ/mol[/tex]
The change in enthalpy for the reaction of carbon dioxide is -393.5 kJ/mol. Thus, option A is correct.
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Answer:
-393.5 kJ
Explanation:
edg 22, goodluck!
Solar power plants convert a form of
energy to an
form of energy
Answer:
not sure what to say to this but the rays of the sun contain solar energy which is then converted into energy to use for electrical power
Can someone please help me it’s not hard I just need to get it done now!!
Answer:
The Chinese created black powder roughly 1000 years ago. It's a 75:15:10 mix of potassium nitrate (saltpeter), charcoal, and sulfur. Black powder is contained in a tube around a fuse in basic firework rockets. When lighted, more sophisticated fireworks shells are fired from a mortar containing black powder, which generates a lift-off response.
Distinct metals are mixed to generate different colors in fireworks. The difference between incandescence and luminescence is that incandescence is light created by heat and luminescence is light produced by other sources. Pure components are required for any type of light since traces of other chemicals will cloud the hue. Copper chloride produces a blue tint, while barium chloride produces a luminous green color.
which of these molecules is nonpolar?
a.CH3CI
b.CO
c.O2
d.PF3
Answer:
i think the answer is D
Explanation:
Answer:
C: O2
Explanation:
Hope it helps
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