Answer:
Since sugar spontaneously dissolves in water, the total entropy of water and sugar has to increase when sugar dissolves.
so.
b. the sugar’s entropy increases, and the total entropy of the universe increases
2 What is the correct sequence of steps for the preparation of a pure sample of copper(II) sulfate
crystals from copper(II)oxide and sulfuric acid?
A dissolving → crystallisation → evaporation - filtration
B dissolving → evaporation filtration → crystallisation
Cdissolving → filtration - crystallisation - evaporation
D dissolving + filtration → evaporation → crystallisation
Answer:
The correct answer is - B. dissolving → evaporation filtration → crystallisation
Explanation:
The method of the preparation of a pure sample of copper(II) sulfate from dilute sulfuric acid and copper II oxide is given as follows:
step 1. Adding dilute sulfuric acid into a beaker. Using bunsen burner heat the beaker.
step 2. Adding the copper (II) oxide into the beaker and give it a little time at a time to the warm dilute sulfuric acid and stir
step 3. Filtering the mixture into an evaporating vessel to remove the excess copper (II) oxide and water from the filtrate.
Step 4. leave the rest filtrate to crystallize.
Copper (II) Oxide {CuO (s)} + Dilute Sulfuric Acid {H2SO4 (aq)} → Copper (II) Sulphate {CuSO4 (s)} + Water {H2O}
The correct sequence of steps for the preparation of a pure sample of copper(II) sulfate crystals from copper(II) oxide and sulfuric acid is dissolving → evaporation filtration → crystallisation.
Which form is the purest?Purest form of any substance is the crystalline form, if we get the compound in the crystalline form from any extraction then we get a pure sample.
Crystals of copper(II) sulfate, will get from copper(II) oxide and sulfuric acid through following steps:
First we put sulfuric acid in a beaker and then we warm in water bath.Then we add some powder of copper(II) oxide to the beaker, and will continue this adding till it is in excess.Then we filter the mixture and pour the filtrate of copper(II) sulfate into an evaporating basin and heat the solution evaporate half of the water.Then we pour the above solution into an evaporating basin & leave to allow all water to evaporate, and finally get the crystals of copper(II) sulfate.Hence, option (B) is correct.
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I need help with this because it's easy for you guys but I don't understand it
Answer:
from nitrogen fixation in plants, lightning and bacteria
Explanation:
18.0 g of carbon produces 55.0 g of carbon dioxide. What is the theoretical yield of CO2?
Answer:
Theoretical yield of CO₂ is 66 g
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated:
C + O₂ —> CO₂
Next, we shall determine the mass of C that reacted and the mass of CO₂ produced from the balanced equation. This can be obtained as follow:
Molar mass of C = 12 g/mol
Mass of C from the balanced equation = 1 × 12 = 12 g
Molar mass of CO₂ = 12 + (16×2)
= 12 +32
= 44 g/mol
Mass of CO₂ from the balanced equation = 1 × 44 = 44 g
SUMMARY:
From the balanced equation above,
12 g of C reacted to produce 44 g of CO₂.
Finally, we shall determine the theoretical yield of CO₂. This can be obtained as follow:
From the balanced equation above,
12 g of C reacted to produce 44 g of CO₂.
Therefore, 18 g of C will react to produce = (18 × 44)/12 = 66 g of CO₂.
Thus, the theoretical yield of CO₂ is 66 g.
Answer:
66 grams
Explanation:
Which property of a star is closely related to its temperature?
omposition
brightness
Color
size
Answer:
color
Explanation:
In an experiment, students were given an unknown mineral. The unknown mineral was placed in 150 ml of water. Once in the water, the volume went up to 165 ml. Then when the same object was dried, then massed on a balance. It had a mass of 225 grams. What is the density of the unknown mineral?
Note: You only have to fill in the numerical answer.
Answer:
15 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
But from the question
volume = final volume of water - initial volume of water
volume = 165 - 150 = 15 mL
We have
[tex]density = \frac{225}{15} = 15 \\ [/tex]
We have the final answer as
15 g/mLHope this helps you
How much energy is contained in a particle that has a mass of m = 1 ug
Answer:
90MJ
Explanation:
Energy= mc^2
Where c= speed of light
m= mass of the object
Mass= m = 1 ug ( then we need to convert from micro gram to micro Joule)= 0.000000001
C= 3× 10^8 m/s
E= = [0.000000001 × (3× 10^8 )^2]
E = [0.000000001 × 89 875 517 873 681]
= 89 875 517.9 joule
Then we can convert to megajoules as
90MJ
Question 5 In the Haber reaction, patented by German chemist Fritz Haber in 1908, dinitrogen gas combines with dihydrogen gas to produce gaseous ammonia. This reaction is now the first step taken to make most of the world's fertilizer. Suppose a chemical engineer studying a new catalyst for the Haber reaction finds that liters per second of dinitrogen are consumed when the reaction is run at and the dinitrogen is supplied at . Calculate the rate at which ammonia is being produced. Give your answer in kilograms per second. Round your answer to significant digits. Clears your work. Undoes your last action. Provides information about entering answers.
Answer:
0.41kg/s
Explanation:
Question 5 In the Haber reaction, patented by German chemist Fritz Haber in 1908, dinitrogen gas combines with dihydrogen gas to produce gaseous ammonia. This reaction is now the first step taken to make most of the world's fertilizer. Suppose a chemical engineer studying a new catalyst for the Haber reaction finds that 505. liters per second of dinitrogen are consumed when the reaction is run at 172 °C and the dinitrogen is supplied at 0.88 atm. Calculate the rate at which ammonia is being produced. Give your answer in kilograms per second. Round your answer to 2 significant digits. Clears your work. Undoes your last action. Provides information about entering answers.
Step 1: Convert 172 °C to Kelvin
We will use the following expression.
K = °C + 273.15
K = 172°C + 273.15 = 445 K
Step 2: Calculate the moles of N₂ consumed every second
We will use the ideal gas equation.
P × V = n × R × T
n = P × V/R × T
n = 0.88 atm × 505. L/(0.0821 atm.L/mol.K) × 445 K = 12 mol
Step 3: Calculate the rate of production of ammonia
Let's consider the balanced equation for the synthesis of ammonia.
N₂ + 3 H₂ ⇒ 2 NH₃
The molar ratio of N₂ to NH₃ is 1:2. The rate of production of ammonia is:
12 mol N₂/s × 2 mol NH₃/1 mol N₂ = 24 mol NH₃/s
Step 4: Convert the rate from mol/s to kg/s
We will use the following conversion factors:
The molar mass of NH₃ is 17.03 g/mol.1 kg = 1000 g[tex]\frac{24mol}{s} \times \frac{17.03 g}{1mol} \times \frac{1kg}{1000g} = 0.41kg/s[/tex]
describe how solid ammonium chloride can be separated from a solid mixture of ammonium chloride and anhydrous calcium chloride
Answer:
It can be done by crystallization, filtration or sublimation. The easiest method among the three is separation by sublimation. Ammonium chloride sublimes upon heating.
Explanation:
Combustion, or __________, is an example of one of the most familiar chemical changes. Melting of ice, likewise, is one of the most common examples of physical changes. When a piece of coal burns, combines with the carbon in the coal. The products are carbon dioxide gas, water vapor, and a lot of ash. After careful measurements are taken, the of the reactants (coal and oxygen) is to the mass of the products (carbon dioxide, water vapor, and ash). During the_________ reaction, the quantity of matter is unchanged. Similarly, when 10 grams of ice__________ , grams of water is obtained. Mass is_________ in this change as well.
Answer:
a) Burning
b) physical
c) 10
d) constant
Explanation:
Mass remains same in a physical reaction. It changes only in chemical reactions where some of the mass is lost as energy /heat.
Thus, during combustion mass changes while during melting mass of water do not changes.
Suppose you have 11.0 mol of (CH4) and 9.0 mol of (O2) in a reactor. Calculate the largest amount of CO2 that could be produced
Even when the temperature of a pan of water is less than the boiling point, water still evaporates. This is because
a. the speeds of individual molecules varies
b. conservation of energy
c. of convection
d. radiation
Which of the following chemical substances has diatomic molecules? a) carbon dioxide b) nitrogen c) ozone d) nitrogen dioxide
Answer:
C I think
Explanation:
While eating dinner with her family, Tina's mother starts to cough. When Tina
asks her mother if she is okay, her mother is unable to speak or make any
other noise. What is happening to Tina's monther, and what should she do
next to provide aid?
A. Tina's mother has mild FBAO. Tina should begin administering
abdominal thrusts, followed by back blows if the problem persists.
B. Tina's mother has mild FBAO. Tina should begin administering
back blows, followed by abdominal thrusts if the problem persists.
C. Tina's mother has severe FBAO. Tina should begin administering
back blows, followed by abdominal thrusts if the problem persists.
D. Tina's mother has severe FBAO. Tina should begin administering
abdominal thrusts, followed by back blows if the problem persists.
The correct answer is: C. “Tina’s mother has severe FBAO. Tina should begin administering back blows followed by abdominal thrusts if the problem persists.”
Explanation: I did my study and took the test, this was right. :)
Plzzzzz help... What causes specific lines to appear in a line spectrum?
Answer:
Spectral lines are produced by transitions of electrons within atoms or ions. As the electrons move closer to or farther from the nucleus of an atom (or of an ion), energy in the form of light (or other radiation) is emitted or absorbed.…
Explanation:
Specific lines appear in a line spectrum because produced by transitions of electrons within atoms or ions.
What are spectral lines?Spectral lines are produced when the electrons undergoes transitions within atoms or ions. When the electrons move far or near to nucleus of any atom, radiation of particular wavelength is emitted or absorbed.
These emitted light is represented as they are moving from one state to the another.
Thus, specific lines appear in a line spectrum because produced by transitions of electrons within atoms or ions.
Learn more about spectral lines.
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What volume in milliliters of H20 you need during preparation of 100 milliliters of 14.00 M H2SO4 solution starting with bottle of 17.5 M H2SO4? (Round your answer to closest integer)
Answer:
20 mL
Explanation:
We can determine the required volume of the concentrated (17.5 M) H₂SO₄ solution by using the C₁V₁=C₂V₂ formula:
17.5 M * V₁ = 14.00 M* 100 mLV₁ = 80 mLAs out of the 100 mL of the final solution, 80 mL are from the concentrated H₂SO₄ solution, the remaining 20 mL are of water (H₂O).
Help I can’t figure it out.
What is the volume of CO2 (acting as an ideal gas) if 64.0 mL of 1.261 M HCl reacts with excess
CaCO3 at 28 °C and 0.987 atm? Show your work and box your answer
2HCl + CaCO3 + H2O + CO2 + CaCl2
Answer:
1.01 L
Explanation:
Step 1: Write the balanced equation
2 HCl + CaCO₃ ⇒ H₂O + CO₂ + CaCl₂
Step 2: Calculate the reacting moles of HCl
64.0 mL (0.0640 L) of 1.261 M (1.261 mol/L) HCl react. The reacting moles are:
0.0640 L × 1.261 mol/L = 0.0807 mol
Step 3: Calculate the moles of CO₂ produced from 0.0807 moles of HCl
The molar ratio of HCl to CO₂ is 2:1. The moles of CO₂ produced are 1/2 × 0.0807 mol = 0.0404 mol.
Step 4: Calculate the volume occupied by 0.0404 moles of CO₂
0.0404 moles of CO₂ are at 28 °C (301 K) and 0.987 atm. We can calculate the volume occupied using the ideal gas equation.
P × V = n × R × T
V = n × R × T / P
V = 0.0404 mol × (0.0821 atm.L/mol.K) × 301 K / 0.987 atm = 1.01 L
Alkenes can isomerize under aqueous acidic conditions to form a more stable alkene. Draw the more stable alkene isomer and give the curved arrow mechanism to show its formation. g
Answer:
See explanation below
Explanation:
You are not providing the alkene you want to stabilize, however, I manage to find a similar question with an alkene. All you have to do is follow the same procedure, cause its pretty similar the steps.
According to the below picture, we have an alkene between carbon 1 and 2, where carbon 2 is less stable than carbon 3 which have another methyl group.
In order to do this, in a first step, the alkene is converted into a alkane by the addition of a hydrogen atom that the hydronium has. Then, in the next step, we have a substraction of the hydrogen in carbon 3 to form the double bond between carbon 1 and 3.
If this temperature on Earth increases what effects would this have all over the world? Match each highlighted region with the most likely effect.
Answer:
Explanation:
Explanation:
If Earth’s temperatures increase, it would likely have these effects:
The East Coast of the United States will face an increased risk of hurricanes as warmer waters increase evaporation.
The polar region will experience melting ice caps, which will cause sea levels to rise.
Warmer water in the Great Lakes will cause heavier lake-effect snows.
In the Pacific Ocean, heating of the water will cause a change in convection currents.
Hot, dry conditions will increase the risk of wildfires in the forests of California.
In the Himalayas, animal and plant life will migrate to higher ground to live.
The coastal regions of Europe will be at greater risk of flooding because of rising sea levels.
Thermosetting polymers are less likely to be recycled than thermoplastic polymers because: Thermosetting polymers are less likely to be recycled than thermoplastic polymers because: Some other reason. They are so cheap that it is not worthwhile to recycle them. They cannot be re-melted by heating to form into new shapes. They are so durable that there are not enough thermosetting polymers in the waste stream to set up a recycling program.
Answer:
They cannot be re-melted by heating to form into new shapes.
Explanation:
Recycling refers to the process of melting a plastic and making it into another shape or size.
Thermoplastics can be softened repeatedly, melted and remoulded. Thermosetting polymers can not be softened, melted and remoulded once they are formed.
Hence, thermosetting polymers cannot be re-melted by heating to form into new shapes therefore they can't be recycled.
4. The table shows the thermal conductivity of some common materials. Which would be the best insulator A. diamond B. gold C. lead D. concrete
please help me
The answer should be diamond.
Explanation:
NEED HELP ANSWERING THIS QUESTION
I-Ö-I I--I.
I-U-I •I-O-I.
I-Ö-I
B.
D.
Which is the correct Lewis structure for ethylene, C2H4?
.
I-0-I I-0-I
I.-O-I
II
E.
I-U-I
エーローエ
OA. A
OB. B
Ос. с
OD. D
A.
Answer:
I think the answer is A.
please give thanks if it helps
and sorry if it doesn't help.
What do you think is the most important part of the radio receiver circuit?
Answer:
Design of a radio receiver must consider several fundamental criteria to produce a practical result. The main criteria are gain, selectivity, sensitivity, and stability. The receiver must contain a detector to recover the information initially impressed on the radio carrier signal, a process called modulation.
How many miles of N are in 0.179g of N2O?
Answer:
8.14x10⁻³ moles of N
Explanation:
In order to solve this problem first we convert 0.179 grams of N₂O into moles, using its molar mass:
0.179 g ÷ 44 g/mol = 4.07x10⁻³ mol N₂OThen we convert N₂O moles into N moles, using the data given by the compound's formula (that there are two N moles per N₂O mol):
4.07x10⁻³ mol N₂O * [tex]\frac{2molN}{1molN_2O}[/tex] = 8.14x10⁻³ mol NPlease help! Due today!
Answer:
five(5) of them
sorry if I'm wrong
Please who knows ?
Which is not a conjugate acid-base pair?
A. HNO3and NO3-
B. CH3COOH and CH3COO
C. H3O+ and OH-
D. HSO4-and SO4/2-
Answer:C
conjugate of H3O+ is H2O
3. If the force of gravity between Earth and the sun were greater than Earth’s inertia, what would happen to Earth? (highlight your answer)
A.Earth would escape into space
B. Earth would fall into the sun
C. Earth would remain in its orbit around the sun
D. Earth would stop moving
Answer:
B
Explanation:
Gravity pulls so if it is greater, then earth will fallllllll
If the force of gravity between Earth and the sun were greater than Earth’s inertia then the Earth would fall into the sun. The correct option is B.
What is gravity?The force that keeps the gases in the sun together. The force that causes a ball thrown into the air to fall back down.
The force that causes a car to coast downhill even when no gas is applied. The force that results to a glass to fall to the floor when it is dropped.
The stronger the pull of the gravitational forces they exert on each other, the greater the mass of the two objects and the shorter the distance between them.
The Sun's gravity is approximately 27.9 times that of Earth, and it aids in the control of the tides on Earth.
The Earth would fall into the sun if the force of gravity between Earth and the sun was greater than the force of inertia.
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Which of the following statements are true?
Question 1 options:
Chemical equilibrium is achieved when there is a higher concentration of products.
Chemical equilibrium can never be achieved.
When the concentrations of reactants and products remain constant chemical equilibrium is achieved.
Chemical equilibrium is achieved when there is a higher concentration of reactants.
The true statement is that the concentrations of reactants and products remain constant chemical equilibrium is achieved.
What is equilibrium?Equilibrium is a condition where no change in the system of the reaction takes place.
If we represent a chemical reaction in the equilibrium state as:
A + B ⇄ C + D
Where, A & B are reactants and C & D are products and at the equilibrium condition concentration of reactant as well as of products remain constant which is dedicated by double headed arrow.
Higher concentration of product shows the forward condition of the reaction.Higher concentration of reactants shows the backward condition of the reaction.Hence in equilibrium concentration of reactants as well as of products are constant.
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Natural processes tend to increase the __________ of thermodynamic systems.
a. internal energy
b. temperature
c. entropy
d. Carnot efficiency
Answer:
the answer is c
Explanation:
PLS HELP ASAP. list 5 chemicals that contribute to ozone layer depletion?
Answer:chlorofluorocarbons (CFCs)
halon.
carbon tetrachloride (CCl4)
methyl chloroform (CH3CCl3)
hydrobromofluorocarbons (HBFCs)
hydrochlorofluorocarbons (HCFCs)
methyl bromide (CH3Br)
bromochloromethane (CH2BrCl)
Explanation:
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