What is the enthalpy in KJ of reaction for the initial combustion if the delta H for vaporization is 75.75 KJ and the net delta H is -700 kJ?
Write your answer to hundredths, including a negative sign if needed. Do not write the unit.
Answer:
-775.75
Explanation:
During which process is liquid changed to a gas within the water cycle?
Answer:
evaporation.
evaporation is the process by which water changes from liquid to a gas or vapor.
How many moles of CO2 are in 58.5 g of carbon dioxide?
4 points
2.72 mol CO2
1.07 mol CO2
3.42 mol CO2
1.83 mol CO2
During a hurricane, what effect can the ocean have on the beach?
A.
Only the wind from a hurricane affects the land.
B.
Only the rain from a hurricane affects the land.
C.
The ocean can wash away much of the beach in a short time.
D.
The ocean always cleans litter from the beach during a hurricane.
Do molecules move faster or slower when energy is transferred in?
Answer:
In conduction, faster-moving molecules contact slower-moving molecules and transfer energy to them. During conduction the slower-moving molecules speed up and the faster-moving molecules slow down.
Explanation:
What is the name of this molecule?
Answer:
pentanoic acid
Explanation:
it has 5 carbon atoms which gives it the parent name pent, and its attached to the ester group
Two trials are run, using excess water. In the first trial, 7.8 g of Na2O2(s) (molar mass 78 g/mol) is mixed with 3.2 g of S(s). In the second trial, 7.8 g of Na2O2(s) is mixed with 6.4 g of S(s). The Na2O2(s) and S(s) react as completely as possible. Both trials yield the same amount of SO2(aq). Which of the following identifies the limiting reactant and the heat released, q, for the two trials at 298 K?
Limiting Reactant q
A. S 30. kJ
B. S 61 kJ
C. Na2O2 30. kJ
D. Na2S2 61 kJ
Answer:
The answer is "Option C".
Explanation:
Given equation:
[tex]2Na_20_2 (s)+S(s)+2H_2O \longrightarrow 4NaOH(aq)+SO_2(aq)[/tex]
[tex]\to \Delta H^{\circ}_{rxn} (298\ K) = -610 \frac{kJ}{mol}[/tex]
[tex]\to Na_2O_2 \ Mass = 7.8 \ g\\\\ \to Na_2O_2 \ Molar \ mass = 78 \frac{g}{mol}[/tex]
[tex]Na_2O_2[/tex] Has been the reactant which is limited since the two experiments are equal to[tex]Na_2O_2[/tex] for relationship between stress amounts.
[tex]Na_2O_2, n =\frac{Mass of Na_2O_2}{Molar mass of Na_2 O_2}=\frac{7.8 \ g}{78 \frac{g}{mol}} =0.1 \ mol \\\\q=\Delta H^{\circ}_{rxn} \times n = \frac{ -610 \ kJ}{ 2 \ mol \ Na_2 O_2} \times 0.1 \ mol \ Na_2O_2= 30.5 \ KJ\\\\[/tex]
Limiting reactant =[tex]Na_2O_2[/tex]
[tex]q=30.5 \ kJ \approx 30 \ kJ[/tex]
Select the atomic models that
belong to the same element.
FREE BRAINLIST NEED HELP ASAP
Answer: F. Electrons
Explanation: hope it helped .u.
- Explain why the term greenhouse effect is used to describe the theory of global
warming.
Does the greenhouse effect affect life on Earth? If yes, explain how?
What are the possible effects of a buildup of greenhouse gases in our atmosphere?
How can the speed of solvent molecules be slowed down?
A.by increasing the temperature
B. by increasing the surface area of the solute
C. by increasing the pressure
D. by decreasing the temperature
E. by decreasing the surface area of the solute
Answer:
D
Explanation:
When molecules absorb energy they speed up and have a more forceful collision with solute molecules.
is chemical energy stored in coal, gas, and oil?
WILL MARK B!
Check image
Will increase points but someone answer Because I have an exam please answer ASAP
Answer:
Bro don't cheat in online exams bro
When water vapor ______,
it gives the same amount of
potential energy which it gained.
A.Changes into water
B.Changes into ice
C.
Remains as water vapor
h
D.None of the above
Answer: Change into water
Explanation: hope you have a great day <3
Water vapor is the gaseous phase of the water or also called an aqueous phase. When water vapor changes into water same amount of potential energy are released.
What is potential energy?Potential energy is the amount of energy present or stored in an object or body related to its position or arrangement.
When the water vapor undergoes a phase transition, the amount of the potential heat or energy released is equivalent to the energy it gained for the formation.
Therefore, option A. transition to water gives the same amount of potential energy.
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What is the pressure exerted by 2.5 mol of gas with a temperature of 25 Celsius and a volume of 12.2 L
Answer:
5.01 atm
Explanation:
To answer this question, we're going to use the PV=nRT equation, where in this case:
P = ?V = 12.2 Ln = 2.5 molR = 0.082 atm·L·mol⁻¹·K⁻¹T = 25 °C ⇒ 25 + 273.16 = 298.16 KWe input the data:
P * 12.2 L = 2.5 mol * 0.082 atm·L·mol⁻¹·K⁻¹ * 298.16 KAnd finally solve for P:
P = 5.01 atmWhat is the standard temperature? Express your answer in kelvins to two decimal places.
Answer:
The standart temperature is 273.15 degrees Kelvin
Explanation:
Answer:
i would say its 0 degrees celcius
Explanation:
Use the following balanced reaction to solve 1-3:
P4 (s) + 6H2 (g) → 4PH3 (g)
How many grams of phosphorus trihydride will be formed by reacting 60 L of Hydrogen gas with an excess of P4?
Answer:
60.86 g of PH₃
Explanation:
We'll begin by calculating the number of mole of H₂ that will occupy 60 L. This can be obtained as follow:
22.4 L = 1 mole of H₂
Therefore,
60 L = 60 / 22.4
60 L = 2.68 mole of H₂.
Next, we shall determine the number of mole of PH₃ produced by the reaction of 60 L (i.e 2.68 mole) of H₂. This can be obtained as follow:
P₄ + 6H₂ –> 4PH₃
From the balanced equation above,
6 moles of H₂ reacted to produce 4 moles of PH₃.
Therefore, 2.68 moles of H₂ will react to to produce = (2.68 × 4)/6 = 1.79 moles of PH₃.
Finally, we shall determine the mass of 1.79 moles of PH₃. This can be obtained as follow:
Mole of PH₃ = 1.79 moles
Molar mass of PH₃ = 31 + (3×1)
= 31 + 3 = 34 g/mol
Mass of PH₃ =?
Mass = mole × molar mass
Mass of PH₃ = 1.79 × 34
Mass of PH₃ = 60.86 g
Thus, 60.86 g of PH₃ were obtained from the reaction.
How many calcium atoms are in 56.5 g of calcium?
Answer:
there are 8.501×10^23 atoms of Ca atoms
How does size affect weight?
(20 points, write at least 5 sentences answer pls thx!)
32 g of a metal, M, reacts with 8 g of oxygen to form an oxide. The formula of the oxide is MO. What is the atomic mass of M in g mol-?
Answer: M= 128 g/mol (Te is quite close)
Explanation: number of Oxygen moles is n = 8 g / 32 g/mol = 0,25 mol.
Because formula of oxide is MO, thus amount of metal is also 0,25 mol.
Because n = m/M , Molar mass of the metal M = m/n = 32 g /0.25 mol = 128 g/ mol
Classify the following as either an element, compound, homogeneous mixture or
heterogeneous mixture:
milk
Answer:
HeterogeneousExplanation:
Milk seems to be homogeneous mixture but actually milk is a heterogeneous mixture and a colloid solution.The cell wall regulates what enters and exits the cell? True or False
Answer:
True
Explanation:
Answer:No, the Cell Membrane does I'm pretty sure
Explanation:
Fission and fusion are alike in many ways. However, one difference is
A)
Fusion forms dangerous nuclear waste that is difficult to dispose whereas
fission does not.
Eliminate
B)
Fission is a controllable chain reaction and fusion is not.
Fusion results in a greater product mass whereas fission does not.
D)
Raw materials for fission are cheaper and easy to get.
Explanation:
Fusion vs Fission
In fission, energy is gained by splitting apart heavy atoms, for example uranium, into smaller atoms such as iodine, caesium, strontium, xenon and barium, to name just a few. However, fusion is combining light atoms, for example two hydrogen isotopes, deuterium and tritium, to form the heavier helium. Both reactions release energy which, in a power plant, would be used to boil water to drive a steam generator, thus producing electricity.
Answer:
B
Explanation:
i did this
Consider the reactivity of phenol, bromobenzene, toluene, and nitrobenzene toward electrophilic aromatic substitution.
The most reactive compound is:_____
because the _______ character of the ______ increases the rate of the reaction.
The least reactive compound is ______
because the _______ character of the ________ decreases the rate of the reaction.
Answer:
The most reactive compound is: Phenol because the electron donating character of the alcohol group increases the rate of the reaction.
The least reactive compound is nitrobenzene
because the electron withdrawing character of the nitro group decreases the rate of the reaction.
Explanation:
PHENOL-: Any of a group of organic compounds with a hydroxyl (OH) group bound to a carbon atom in an aromatic ring is known as phenol. The word phenol is also the basic name for its simplest member, monohydroxybenzene (C6H5OH), also known as benzenol or carbolic acid, in addition to being the common name for the entire family.ELECTRON DONATING CHARACTER-: Via the carbon atom it is bound to, an electron donating group (EDG) has the net effect of increasing electron density in a molecule. EDGs alter a molecule's reactivity by increasing electron density on neighboring carbon atoms: EDGs make nucleophiles stronger.ALCOHOL GROUP-:Each of a class of organic compounds that have one or more hydroxyl (OH) groups bound to an alkyl group's carbon atom (hydrocarbon chain)is called Alcohol. Alcohols are organic compounds of water [tex](H_2O)[/tex] in which one of the hydrogen atoms has been substituted by an alkyl group, which in organic structures is usually expressed by R.NITROBENZENE-:The organic compound nitrobenzene has the chemical formula [tex](C_6H_5NO_2)[/tex]. It's a pale yellow oil that's insoluble in water and smells like almonds. Greenish-yellow crystals form when it freezes. It is made on a wide scale as a precursor to aniline from benzene. It is sometimes used as a solvent in the laboratory, especially for electrophilic reagents.ELECTRON WITHDRAWING GROUP-: An electron withdrawing group (EWG) is a type of group that reduces electron density in a molecule by bonding to a carbon atom. EWGs alter a molecule's reactivity by reducing electron density on neighboring carbon atoms.NITRO GROUP-: The nitro group is one of the most widely used explosophores (functional groups that combine to form a compound explosive). In addition, the nitro group is a heavy electron-withdrawing group. CH bonds alpha (adjacent) to the nitro group may be acidic due to this property.During a dry compression test, the first puff of the test shows 50 PSI and the maximum reading after 4 strokes is 150 PSI. This indicates A. that the cylinders are good. B. weak piston rings. C. a bad spark plug. D. a hole in the piston.
One of the basic engine-diagnostic procedures that can be run is an engine compression test. All of the cylinders must have the same compression for the engine to run smoothly. There are just three possible ways for air to leak out of an engine and cause compression loss.
Exhaust or intake valve Engine rings (or piston, if there is a hole) An engine's head gasketThe procedures for conducting a compression testThe engine should be warmed to its typical operating temperature before testing in order to achieve the best results. The following procedures should be followed for an accurate compression test:
STEP 1: Dispose of each spark plug. As a result, the engine can be turned up to the same speed. Label all spark plug wires accurately.STEP 2 is to block the throttle open. This enables the engine to pull in the most air possible. Additionally, this step guarantees reliable compression test results.STEP 3 After inserting a compression gauge into a spark plug hole, start the engine. Four compression strokes of engine cranking should be performed in total. A puffing sound is produced after each compression stroke.EXAMPLE-If the ultimate, maximum value is 150 PSI, for instance, the reading following the first puff should be greater than 75 PSI. Low first-puff readings could be a sign of weak piston rings.STEP 4 Keep track of the highest readings, then compare the outcomes.Learn more about compression test here https://brainly.com/question/13274092
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when someone pours milk into this life what is the the role of the coffee
A. Salt
B solvent
C solute
D solution
Neutralization Reactions
5. Acids and bases go to completion via neutralization reactions, thus titrations are applicable. Refer to educational resources and provide an example of the chemical reactions for the solutions in a–c.
a. A mixture between a strong acid and a strong base.
b. A strong base mixed with a weak acid.
c. A strong acid mixed with weak base.
Answer:
its a option neutralization takes place between acid and base plz mark me branliest
Radiation from which type of decay has the most energy?
A. Alpha decay
B. Electromagnetic decay
C. Beta decay
D. Gamma decay
Pls answer quick
Answer: D
Explanation:
Radiation from gamma decay has the most energy and the correct option is option D.
What is Radioactive Decay?To become more stable, the nuclei undergo radioactive decay. In this process, the nuclei give off energy and may also emit charged particles of matter.
Types of radioactive decay include alpha, beta, and gamma decay. In alpha and beta decay, both particles and energy are emitted. In gamma decay, only energy, in the form of gamma rays, is emitted.
In the gamma decay, a nucleus changes from a higher energy state to a lower energy state through the emission of electromagnetic radiation.
Therefore, Radiation from gamma decay has the most energy and the correct option is option D.
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explain what you would do expect caesium astatide to look like .will it be soluble in water ?explain your reasoning
Answer:
it will not be soluble in water Becoz it can only be
separated by passing it through silver nitrate solution
Explanation:
i hope you understand
A sample of carbon dioxide gas at a pressure of 686 mm Hg and a temperature of 73 C, occupies a volume of 6.34 liters. If the gas is cooled at constant pressure to a temperature of 35 C, the volume of the gas sample will be ____________ L.
Recall the ideal gas law,
P V = n R T
Find the amount of CO₂ in the sample, n :
P = 686 mm Hg ≈ 91,459 Pa
V = 6.34 L
R = 8.3145 J/(mol•°K)
T = 73 °C = 346.2 °K
→ n = P V / (R T ) ≈ 0.20147 mol
Now find the volume V of the sample when the temperature T is 35 °C = 308.2 °K :
V = n R T / P ≈ 5.6349 L ≈ 5.63 L