Answer:
d. delta H is positive, and delta S is positive
Explanation:
The process of dissolution of NH4Cl is:
NH4Cl(s) → NH4+(aq) + Cl-(aq)
As the solution is cooled, the process is absorbing energy, that means ΔH > 0. (ΔH < 0 when the heat is released).
As there are produced 2 ions from 1 solid molecule, the disorder is increasing and ΔS > 0
The right answer is:
d. delta H is positive, and delta S is positive2. natakot, nabalisa, naginbal
Answer:
Saan yung tanong?? +?? ++?
pls help
Mercury is a toxin that is of significant concern due to biomagnification. It can be found in varying concentrations in fish. Many health organizations provide guidelines for fish consumption and list average mercury concentrations in different fish species. Explain how mercury found in an aquatic environment can accumulate in biomagnification, and explain how limiting consumption of large predatory fish, such as swordfish, may be necessary for individuals trying to avoid high mercury concentrations
Answer:
in the water, plants and small organisms like plankton take up mercury through passive surface absorption or through food intake. ... Methylmercury biomagnifies through the food chain as predators eat other organisms and absorb the contaminants that their food sources contained.
Explanation:n the water, plants and small organisms like plankton take up mercury through passive surface absorption or through food intake. ... Methylmercury biomagnifies through the food chain as predators eat other organisms and absorb the contaminants that their food sources contained.
Plants and small organisms like plankton absorb mercury in the water via passive surface absorption or food intake. Methylmercury biomagnifies through the food chain as predators consume other organisms and absorb contaminants from their prey.
What is biomagnification ?Biomagnification is the condition in which the chemical concentration in an organism exceeds the concentration of its food when the organism's diet is the primary exposure route.
Any concentration of a toxin, such as pesticides, in the tissues of tolerant species at increasingly higher levels in a food chain is referred to as biomagnification. One example of biomagnification in action is the accumulation of the insecticide DDT in zooplankton.
Mercury is taken up by water, plants, and small organisms such as plankton via passive surface absorption or food intake. Methylmercury biomagnifies through the food chain as predators consume other organisms and absorb contaminants from their prey.
Thus, Methylmercury biomagnifies through the food chain as predators consume other organisms and absorb contaminants from their prey.
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Consider the reaction described by the following chemical equation.
2 HN3(1) + 2 NO(g) — H2O2(1) + 4 N, (g)
What is the enthalpy change associated with the production of 1 mol of H, O, if a reaction that produces
2.50 g of H, O, releases 65.9 kJ of heat?
Answer:
Q = -897 kJ/mol
Explanation:
From the given information:
The heat released Q = -65.9 kJ
To start with the molar mass of [tex]H_2O_2[/tex] = 2 × (molar mass of H) + 2 × (molar mass of O)
= (2 × 1.008) + (2 × 16.0 )
= 34.016 g/mol
However, given that:
mass of [tex]H_2O_2[/tex] 2.50 g
The number of moles of [tex]H_2O_2[/tex] = [tex]\dfrac{mass}{molar \ mass}[/tex]
[tex]= \dfrac{2.5}{34.016}[/tex]
[tex]= 7.349 \times 10^{-2} \ mol[/tex]
Finally; Using the formula:
[tex]\Delta H = \dfrac{Q}{number \ of \ moles}\\ \\ Q = \dfrac{-65.9 \ kJ}{7.349 \times 10^{-2} \ mol}[/tex]
Q = -897 kJ/mol
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. :)
Please help me on this one. Thanks
Answer:
Option BExplanation:
Look here,
2H2 + O2. --> 2H2O
On,
LHS = 2 × H2 = 4H atoms and 2O atoms
RHS = 2 × H2 = 4H atoms and 2 × O = 2O atoms
Hence,
LHS = RHS and above equation is balanced.
Somebody please helppp
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]
Which of the following chemical substances has diatomic molecules? a) carbon dioxide b) nitrogen c) ozone d) nitrogen dioxide
Answer:
C I think
Explanation:
Draw the atomic structure with electronic configuration of Potassium
Explanation:
the first shell have 2 electrons
the second shell also have 8 electrons
the third shell also have 8 electrons
the fourth shell have only 1 electron
so the electronic configuration of Potassium is
2,8,8,1
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
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.
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.
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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How many grams of K2O can be made from 43 g of potassium and 32 g of oxygen from the following
equation?
4K + 02 --> 2K2O
Answer:
51.81g of K2O are produced
Explanation:
Based on the reaction, 4 moles of K reacts per mole of oxygen to produce 2 moles of K2O. To solve this question we must find the moles of each reactant in order to find the limiting reactant. With limiting reactant we can find the moles of K2O produced and its mass:
Moles K -Molar mass: 39.0983g/mol-
43g * (1mol / 39.0983g) = 1.1 moles K
Moles O₂ -Molar mass: 32g/mol-
32g * (1mol / 32g) = 1mol O₂
The moles required for the reaction of 1 mole of O₂ are 4 moles of K. As there are just 1.1 moles, K is the limiting reactant.
The moles and the mass of K2O produced are:
1.1moles K * (2mol K2O / 4mol K) = 0.55 moles K
Molar mass K2O = 94.2g/mol
0.55 moles K * (94.2g / mol) =
51.81g of K2O are producedCalculate and Convert (Due Tonight Please Help)
Sorry but I really need these points I just need 5 more sorrrryyy
Engineers find a new metal that is stronger than steel.. (so on)
Answer is : D "Collaborate with other engineers in the design of a plane made from this metal".
Answer:
Explanation:
same thing as normal plane. just replace normal metal with this new sick metal :cool:
also make sure it weighs a good amount and won't fall from weight... im confused was this already answered???
Answer:
Collaborate with other engineers in the design of a plane made from this metal
Explanation:
<3
True or false when matter changes it’s state it is a physical change because it is the same substance the whole time.
Answer:
true
Explanation:
As a rollercoaster travels upward what type of energy transfer is taking place?A.electrical to thermal energy B.kinetic to potential energy C.mechanical to chemical energy D.potential to kinetic energy
Answer:
B.
Explanation:
Hillsdale and Cordera are the same distance from the equator, and both are near the ocean. Is Cordera warmer, colder, or the same temperature as Hillsdale? Explain using wrods energy level, temperature, current
Answer:
Cordera is colder than Hillsdale.
Explanation:
They may be at a similar latitude. But you also have to consider the currents nearby the location.
The prevailing wind closer to the equator which carries warm current hits Hillsdale which is why it follows the coastline of the continent. However, for Cordera prevailing winds carrying cold currents hits the continent and follows or hits the coastline of Cordera.
1. Currently, California students are in class 240 minutes every day. How many hours is this?
Answer:
4 hours a day
Explanation:
240/60=4
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.
If 747 joules of energy is added to a sample of aluminum (specific heat capacity = 0.899 J/g*C) and the temperature goes up from 105.0*C to 121.0*C, what is the mass of the aluminum sample?
Answer:
m = 51.93 grams
Explanation:
Given that,
Energy added, Q = 747 joules
The specific heat capacity of Aluminium, c = 0.899 J/g°C
The temperature goes from 105.0°C to 121.0°C.
Let the mass of the aluminum sample is m. We know that, the heat added to the system is given by :
[tex]Q=mc\Delta T\\\\m=\dfrac{Q}{c\Delta T}\\\\m=\dfrac{747}{0.899 \times (121-105)}\\\\m=51.93\ g[/tex]
So, the mass of the sample is 51.93 grams.
Individual Laboratory Follow-up Questions a. Explain the purpose of the experiment. b. What are reasonable sources of error for determining calcium ion concentration by the titration process? c. Summarize the conclusions for your experiment in two to three complete sentences. Include the amount of calcium in your soil.
Solution :
a). In this experiments, we can determine the hardness of the water or [tex]$Ca^{2+}$[/tex] ion concentration in the sample.
b). The Possible errors are :
- During the weighing of calcium standard preparation, if the balance is not traced properly, it will cause an error.
- By dilution of standard from the stock will lead a dilution error of 0.1 mL for 100 mL.
- Misreading the liter values will give an error.
c). Depending upon the calcium content present in the soil, we conclude that the fertile percent of the soil as well as the mineral capacity of the soil.
From the scenarios described below, which would most likely lead to the formation of a hurricane?
A. a high pressure zone meeting a low pressure zone over warm land
B. thunderstorms meeting over cool ocean water
C. thunderstorms meeting over warm ocean water
D. a warm front and a cool front meet over warm water
Answer:
D.
Explanation:
Hurrocanes are caused from un wanted mixed weather
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
Question 3.
The practice of growing two or more dissimilar crops in the same field one after another is
(a) crop rotation
(b) tilling
(c) plantation
(d) weeding
Answer:
(a) Crop rotation.
Explanation:
Crop rotation is the rotational cultivation of crops one after another in the same field or area. This means that different crops are cultivated in sequence, one after the other, on a rotational basis.
Crop rotation is one way of maintaining the nutrients of the soil. It also allows for the production of different crops without the need to move from one place to another. Crop rotation also helps in growing seasonal crops, thereby making crop production stable, providing a constant supply of crops for the farmers.
Thus, the correct answer is option a.
Help I can’t figure it out.
Most physical and chemical changes in matter include a change of energy true or false
Answer: true
Explanation:
Energy changes are a common component of physical and chemical changes in matter. Hence the statement is True.
Briefing:Physical changes and chemical changes are the two different types of changes that chemists examine. A substance can undergo physical changes without having its identity altered. Chemical transformations take place when one substance transforms into another.
Which is a chemical change?When one chemical material changes into one or more others, as when iron rusts, this is referred to as a chemical transformation. Chemical reactions produce changes in the way that atoms and molecules are ordered, which leads to the formation of new substances with new properties.
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What would happen if the number of protons were to change in an atom?
Answer: you will change the atom from one element to a different element. Sometimes, when you add a proton to an element, the element will become radioactive. If you change the number of neutrons in an atom, you get an isotope of the same element.
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.