Answers
Answer: To develop a strategy for the order in which you add the various equations.
Explanation:
In a Hess’s Law problem, you have to develop a strategy for the order in which you add the various equations. hope this helps <3
The statement, that describes Hess's law applied in calculating enthalpy is "all the reactions in a path are added together."
What is Hess' law?Hess' law of continuous heat summation, abbreviated as Hess' law. Hess' law says that the rise in enthalpy, or reaction heat at constant pressure, in a chemical reaction is independent of the process between the starting and final states.
According to Hess's Law, the enthalpy change for a chemical reaction is independent of the route travelled. This indicates that the overall enthalpy change will be the same regardless of how many steps are completed. Because enthalpy is a state function, we can calculate the overall change in enthalpy by simply adding the changes at each step along the way until the product is obtained All processes must take place at the same temperature, and the equations for each step must balance.
In a Hess's Law problem, you must devise a technique for adding the numerous equations in the correct order.
Hence the correct answer is B.
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Related Questions
A volume of gas at 1.10 atm was measured at 507 ml. What will be the volume if the pressure is adjusted to 1.90
atm?
Answers
Answer:
294mL
Explanation:
We can use this equation to find the unknown volume:
[tex]P_1V_1=P_2V_2[/tex]
To solve, plug in the values we have and solve for the unknown value:
[tex](1.10atm)(507mL)=(1.90atm)V_2\\\frac{(1.10atm)(507mL)}{1.90atm} =V_2\\V_2=293.53mL[/tex]
Rounding to three significant figures gives you the value of 294mL
Scientists often repeat experiments multiple times.
Why is this important?
A.
Repeating an experiment helps to verify the results.
B.
Repeating an experiment turns a hypothesis into a theory.
C.
Repeating an experiment allows scientists to test different variables.
D.
Repeating an experiment gives scientists something to do while they think of new hypotheses.
Answers
Answer:
A
Explanation:
Hi! The reason scientists often experiments multiple times is because repeating an experiment helps to verify the results.
If i add water to orange juice is that a physical change or chemical change?
Answers
Answer:
Nope, not a chemical change.
Explanation:
i hope this helps ok bye luv!!!!!!!!!!!!!!!!!!!!
At a constant temperature the pressure on a 10.0L sample of gas is charged from 1140 torr to 1.00 atm. What is the new volume of gas sample?
Answers
Answer:
15 L
Explanation:
From the question given above, the following data were obtained:
Initial volume (V₁) = 10 L
Initial pressure (P₁) = 1140 torr
Final pressure (P₂) = 1 atm
Final volume (V₂) =?
Recall:
1 atm = 760 torr
The new (i.e final) volume of the gas can be obtained as follow:
Initial volume (V₁) = 10 L
Initial pressure (P₁) = 1140 torr
Final pressure (P₂) = 760 torr
Final volume (V₂) =?
P₁V₁ = P₂V₂
1140 × 10 = 760 × V₂
11400 = 760 × V₂
Divide both side by 760
V₂ = 11400 / 760
V₂ = 15 L
Therefore, the new volume of the gas is 15 L
Which of the following are analogous features? A. dolphin flippers and squirrel arms B. elephant trunks and pig snouts C. rabbit fur and chicken feathers D. dog tails and monkey tails
Answers
Answer:
Explanation:
the answer is rabbit fur and chicken feathers i did that and i got it right i did a quiz i am in middle school 7th grade but here you go the answer
The blood pools in the ___ vessels in those areas if they are not exposed to some kind of pressure.
A. small
B. faster
Answers
Answer:
A
Explanation:
It's smaller hole
Answer:
I would say A.
Explanation:
molar mass of 4Fe(OH)2
Answers
Answer: The molar mass and molecular weight of 4Fe is 223.38.
The valency of chlorine is.
what does it mean
Answers
Answer:
Explanation:
The valency of chlorine is 1 .It means that chlorine has seven valence electrons in its valence shell so it gains one electron from others to be stable during chemical reaction. so its valency is 1.
hope it helps :)
um...Is sulfur dioxide ionic or molecular?
Answers
Answer:
It is a molecular compound.
Explanation:
Answer:
Sulfur dioxide, SO2, is a molecular compound.
Explanation:
It contributes to acid rain, and CaCO3 is an ionic compound that can neutralize acid rain.
if a solution has a pH of 1.50, what is the pOH of the solution?
Answers
Answer:
pOH = 12.50
Explanation:
pOH + pH = 14
pOH = 14 - 1.50 = 12.50
How many Protons, Electrons, and Neutrons are there in Oxygen
Answers
Answer:
Name Oxygen
Atomic Mass 15.999 atomic mass units
Number of Protons 8
Number of Neutrons 8
Number of Electrons 8
Explanation:
“Nature vs. nurture” is a debate about
A
whether a trait is learned or inherited.
B
the traits of plants vs. the traits of animals.
с
whether animals can teach humans new traits.
D
whether a trait was acquired outdoors or indoors.
Answers
Answer:
Letter A
whether a trait is learned or inherited
Explanation:
The nature versus nurture debate involves the extent to which particular aspects of behavior are a product of either inherited (i.e., genetic) or acquired (i.e., learned) influences. Nature is what we think of as pre-wiring and is influenced by genetic inheritance and other biological factors.
The debate called Nature vs. nurture is about whether a trait is learned or inherited. This is an investigation on learned traits and nurtured traits in humans. Thus option A is correct.
What are learned traits ?All living things are learning something during their growth. These learning mold up one's personality and cannot be created by birth. Like the good characteristics we are learning from schools. These behaviors are called learned traits.
Some traits or behaviors are created by birth itself and they are called natural traits. The nature versus. nurture debate is a philosophical, scientific, and cultural discussion about whether human culture, conduct, and personality are largely influenced by nature or nurture.
Environment, culture, and experience are the most prominent definitions of nurture in this discussion, whereas nature is frequently regarded as genetic or hormone-based behaviors, characteristics, and dispositions.
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Why do the algae all look identical while the frogs look different?
Answers
Answer:
because algae made asexually but the frogs come from two sources mother and father
Explanation:
hope it will help you
7
What type of molecule would deviate the most from ideal gas behavior?
Answers
Answer:
molecule at low temperature and high pressure
Explanation:
this is because two of the postulates of kinetic theory of gases hold true only when there is low pressure and high temperature. as the pressure goes on increasing and temperature goes on decreasing, a molecule will deviate from ideal behavior.
When a species cannot respond to environmental changes, members of that species begin to die. When the last member of a species dies, the species becomes _________.
Answers
Extinct
When all of the members of species die out it is called extinct
A gas occupies 4.0 L of air at 1.0 atm pressure and 30.0°C. If the gas occupies 6.0 L of air at 37.0°C, what is the pressure of the gas?
Answers
Answer:
Gas pressure is measured in units such as torr, mmHg, atm, and Pa. ... You can see mass is small, Volume is large. - hense a small ... The pressure increases if volume decreases. ... For each of the following changes of the initial balloon, select ... A sample of nitrogen (N2) has a volume of 60.0 L at a pressure of 725 mmHg.
Explanation:
Please help me with questions 43, 44, and 45
Answers
A car battery produces electrical energy with the following chemical reaction.
Pb + PbO2 + 2H2SO4 →; 2PbSO4 + 2H20
What is the mole ratio of PbO2 to water?
PbO2:H,0 = 1:
Answers
If you look at the start of PbO2 it does not have a number so that is the one and if you look at 2H2O that has a 2 in front so that is where you get the 1:2 ratio
WILL MARK BRAINLIST Which of the following phrases describes the similarities between problem space theory and how the brain looks at problems?
They have only three steps.
They can only be used in a laboratory setting.
They can occur quickly or slowly.
They are biased against the scientific method.
Answers
Answer:
In this theory, people solve problems by searching in a problem space
Explanation:
I hope this helps
Answer:
i do not know
Explanation:
i am not smart
sowwy :l
HELP THIS IS FOR CHEM!! Which of the following are contact forces? Choose three.
Tension, magnetic, electric, gravity, normal,friction,weight.
Answers
Answer:
Tension, friction, and normal
Explanation:
How many seismograph stations are needed to use the S-P-method? Why?
Answers
a minimum of three seismograph stations are needed to find an earthquake's epicenter using the S-P time method.
Scientists use triangulation to find the epicenter of an earthquake. When seismic data is collected from at least three different locations, it can be used to determine the epicenter by where it intersects. ... Knowing this helps them calculate the distance from the epicenter to each seismograph.
Explanation:
(NH4)2 + NaOH -> NH3 + Na2SO4 + H2O how to make this balanced
Answers
Answer:
(NH4)2SO4 + 2NaOH --> 2NH3 + Na2SO4 + 2H2O
Explanation:
A gardener cut her finger while pruning shrubs. She noticed that after two weeks the wounds had nearly healed with just a small scar remaining. Which statement describes what will happen next?
A. Each one of the individual cells near the wound will grow in size to cover the injured part.
B. Cells will be transported from distant areas to the wound to cover the injured area.
C. The cells near the wound will produce identical cells by mitosis to repair the damaged tissues.
D. A material will be released by the injured cells that will cover the wound and repair the cells.
Answers
Answer:
c
Explanation:
The wound will be healed by the production of new cells near the wound by the cell replication process and the therefore the identical cells are produced by the mitosis to repair the damaged tissues.
Note the below points about mitosis;
The mitosis is a process in which the cell replication occurs.In mitosis, the single parent cell is divided into two identical daughter cells by the process of cell division, it takes by time.The mitosis involves the healing of wound, growth of the organisms, replacement of the worn out cells.Thus, mitosis is the process involved in the healing of wound in living beings.
Therefore, we can say that the answer of the question is C. The cells near the wound will produce identical cells by mitosis to repair the damaged tissues.
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The _________ force between the sun and the Earth keeps the Earth in its orbit. The period of ______ is the time it takes for Earth to complete one orbit.
Question 1 options:
revolution, gravitational
rotate, gravitational
gravitational, rotate
gravitational, revolution
Answers
Gravitational force is the force between the sun and the Earth keeps the Earth in its orbit. The period of revolution is the time it takes for Earth to complete one orbit.
What is gravitational force?Gravitational force is a kind of attraction force which acts between the two bodies.
Sun's gravitational force is a 3 dimensional attraction force under which earth is present. And due to centripetal force of sun, orbit of earth is present in the stationary state. Earth revolves around the sun to complete one round of orbit and this motion is known as revolution of earth.
Hence, gravitational force is present between the sun and the earth, and revolution is the time to complete one orbit.
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If the pressure of a gas at constant volume is 4.5 atm at 100 °C, wh
will the pressure be if the temperature is changed to 350 °C?
Answers
Answer:
New pressure = 7.51 atm
Explanation:
Given that,
Initial pressure, P₁ = 4.5 atm
Initial temperature, T₁ = 100°C = 100+273 = 373 K
Final temperature, T₂ = 350°C = 350 + 273 = 623 K
We need to find the new pressure. Using the below relation as follows :
[tex]\dfrac{P_1}{T_1}=\dfrac{P_2}{T_2}\\\\P_2=\dfrac{P_1T_2}{T_1}\\\\P_2=\dfrac{4.5\times 623}{373}\\\\P_2=7.51\ atm[/tex]
So, the new pressure is 7.51 atm.
Which of the following is the
correct way to express
0.0000321 in scientific
notation?
Answers
The earth gravity field strength in the south pole is less than the north pole. Explain
Answers
Answer:
In contrast, at each pole, you are only 6357 km from the center of the earth. Since the strength of gravity weakens as you get farther away from a gravitational body, the points on the equator are farther and have weaker gravity than the poles. ... The earth's centrifugal force also varies with latitude.
Explanation:
hope it becomes helpful to you ☺️☺️
good luck
is a bell potential or kinetic energy?
Answers
Which phrase describes air density?
A. increases as altitude increases
B. equals mass divided by volume
C. pushes molecules in one direction
D. exerts less pressure as it increases
Answers
Answer:
c i think
Explanation:
As the temperature of a gas is increased, the average kinetic
energy of its molecules
Answers
Answer:
Increases.
Explanation:
Temperature is the measure of the average kinetic energy of a system. As temperature increases, so will kinetic energy. As kinetic energy increases, speed increases.