Answer:
c. nitrogen gas
Explanation:
Our air is a homogeneous mixture of many different gases and therefore qualifies as a solution. Approximately 78% of the atmosphere is nitrogen, making it the solvent for this solution.
What is the ph of 0.45m solution of the strong chloric acid HCIO3?
Answer:
pH = 0.35
Explanation:
For a strong acid, all of the acid dissociates into H3O+, and pH = -log[H3O+], where [H3O+] = [HClO3] = 0.45 M.
Which of the following chemical substances has diatomic molecules? a) carbon dioxide b) nitrogen c) ozone d) nitrogen dioxide
Answer:
C I think
Explanation:
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
Consider the following gas phase reaction:
2NO(g) + O2(g) --> 2NO2(g)
400. mL of NO at STP is reacted with 500. mL of O2 at STP. Calculate the volume of the reaction mixture at STP after the reaction goes to completion.
A.700 mL
B.800 mL
C.900 mL
D.1300 mL
E.100 mL
The answer is A. 700 mL, can someone please explain how they arrived at that answer.
Answer:
2NO(g) + O2(g) --> 2NO2(g)
now 400 ml of NO × 2 mol of NO2/2 mol of NO
= 400 ml of NO2
now 500 ml of O2 × 2 mol of NO2/1 mol of O2
= 1000 ml of NO2
now 400 ml of NO2 × 1 mol of O2/2 mol of NO
= 200 ml
subtract that from 500 ml of total i.e. 500-200 =300 ml
The total volume of the reaction mixture is 1000 ml -300ml = 700 ml
Somebody please helppp
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
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.
What body parts are involved in this injury? (e.g., limbs, muscles, tendons, tissue, bones, blood flow, etc.)
Now that you know more about how injuries happen and how to treat them, what can you do differently that will help you prevent an injury?
What are some ways this injury can happen? (e.g., falling, playing with matches, etc.)
How common is this injury? (Look on the Internet to find at least one statistical fact.)
What is the process for treating the injury? (Include all the steps and be detailed.)
Have you ever had this injury? If so, was your injury treated properly?
Answer:
An abrasion or scrape. Spray or pour hydrogen peroxide on the womb. Then apply a patch wrapped to it with an adhesive tape.
Which property of a star is closely related to its temperature?
omposition
brightness
Color
size
Answer:
color
Explanation:
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
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. :)
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.
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.
For more details regarding gravity, visit:
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Enter the correct letter sequence (no
spaces) Use all capital letters *
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:
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.
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.
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
Archeologists can determine the age of artifacts made of wood or bone by measuring the amount of the radioactive isotope 14C present in the object. The amount of isotope decreases in a first-order process. If 15.5% of the original amount of 14C is present in a wooden tool at the time of analysis, what is the age of the tool? The half-life of 14C is 5730 yr.
Answer: The age of the tool is 15539 years
Explanation:
Expression for rate law for first order kinetics is given by:
[tex]t=\frac{2.303}{k}\log\frac{a}{a-x}[/tex]
where,
k = rate constant
t = age of sample
a = let initial amount of the reactant = 100
a - x = amount left after decay process = [tex]\frac{15.5}{100}\times 100=15.5[/tex]
a) for completion of half life:
Half life is the amount of time taken by a radioactive material to decay to half of its original value.
[tex]t_{\frac{1}{2}}=\frac{0.693}{k}[/tex]
[tex]k=\frac{0.693}{5730yr}=0.00012yr^{-1}[/tex]
b) for 15.5 % of original amount
[tex]t=\frac{2.303}{0.00012}\log\frac{100}{15.5}[/tex]
[tex]t=15539years[/tex]
Thus age of the tool is 15539 years
Help I can’t figure it out.
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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Which of the following is an example of an anion that contains a metal?
A. Sulfate
B. Phosphate
C. Chromate
D. Nitrate
.
I think sulphate is answer.
Chromate from the following given list is an example of an anion that contains metal, therefore the correct answer is option C.
What is a Chemical compound?The chemical compound is a combination of two or more either similar or dissimilar chemical elements
Sulphate is an anion in which both sulfur and oxygen are non-metals.
Phosphate is an anion in which both phosphorus and oxygen are non-metals.
Chromate is an anion in which chromium is metal and oxygen is a non-metal.
Nitrate is an anion in which both nitrogen and oxygen are non-metals.
Thus, Chromate is an anion in which chromium is metal, therefore the correct answer is option C.
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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]
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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Atmospheric pressure decreases as altitude increases. In other words, there is more air pushing down on you at sea level, and there is less air pressure pushing down on you when you are on a mountain.If pentane (C5H12), hexane (C6H14), and hexanol (C6H13OH) are heated evenly at different altitudes, rank them according to the order in which you would expect them to begin boiling.
Rank from first to last. To rank items as equivalent, overlap them.
1. Hexane high altitude.
2. Pentane high altitude.
3. Hexane sea level.
4. Hexanol sea level
Answer:
Boils first >Pentane at high altitude> Hexane at high altitude>hexane at sea level> hexanol at sea level> boils last.
Explanation:
Step 1: To boil, a liquid must overcome the attractive forces between molecules and the outside pressure pushing down on the liquid's surface.
(Hexanol> Hexane> Pentane)
Step 2: Identify which situation is most conducive to boiling
To boil, a liquid must overcome the attractive forces between molecules and the outside pressure pushing down on the liquid's surface.
In which situation would you expect the liquid to boil first, assuming equal heating.
(weak intermolecular attraction and low atmospheric pressure)
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
Why vitamin A(retinol) transported by chylomicrons ?
Answer:
from the small intestine (RE = retinyl ester; ROH = ret- inol. CM = chylomicron remnant). is split at least one intact molecule of retinol, retinal.
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:
BRAINLIEST pls
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