Bottle should be labelled as Bromine.
Only two elements are liquid at room temperature mercury and Bromine . Helium and chlorine, arsenic are gases.
What are chemical elements ?A chemical element is a species of atom with a certain number of protons in its nucleus, including a pure substance consisting only of that species. Unlike chemical compounds, chemical elements cannot be broken down into simpler substances by any chemical reaction. The number of protons in the nucleus is a defining characteristic of an element and is called its atomic number (denoted by the symbol Z) - all atoms with the same atomic number are atoms of the same element.
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How much faster does ²³⁵UF₆ effuse than ²³⁸UF₆?
²³⁵UF₆ effuse 1.0042 times faster than ²³⁸UF₆.
The expression for rate of effusion of two gases can be define as follows :
Effusion Rate A / Effusion Rate B = [tex]\sqrt{Mb / Ma}[/tex]
now we have to calculate the molar masses of the given :
molar mass of ²³⁵UF₆ = 235 + 6(19) = 349 g/mol
molar mass of ²³⁸UF₆ = 238 + 6(19) = 352 g /mol
now substituting the values in the formula : we get,
Rate ²³⁵UF₆ / Rate ²³⁸UF₆ = [tex]\sqrt{352 / 349}[/tex] = 1.0042
Therefore , the Rate ²³⁵UF₆ effuses 1.0042 times faster than ²³⁸UF₆.
Thus, ²³⁵UF₆ effuse 1.0042 times faster than ²³⁸UF₆.
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How does oxygen inhaled through the lungs enter the bloodstream. A. Through the nerves. B. Through the alveoli. C. Through the atrium. D. Through the epiglottis
Through the alveoli, oxygen inhaled through the lungs enter the bloodstream.
What is the definition of the respiratory system?The respiratory system is a biological system consisting of certain organs and structures used for gas exchange in animals and plants. The anatomy and physiology that cause it to vary greatly depending on the size of the organism, the environment in which it lives, and its evolutionary history. In terrestrial animals, the respiratory surface is inserted into the mucous membranes of the lungs. Gas exchange in the lungs takes place in millions of tiny air sacs; in mammals and reptiles, they are called alveoli and in birds atrium. These microscopic air sacs have a very rich circulation, which brings the air into close contact with the blood.
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What is the pressure of an 8.5 L cylinder filled with 23.5 grams of nitrogen gas at a temperature of 298 K?
To solve this question, we need to use the Clapeyron equation. The Clapeyron equation is a mathematical expression that relates quantities such as pressure (P), volume (V), temperature (T) and the number of particles (n) that make up an ideal gas.
The formula is PV = nRT.
First, let's transform 23.5 grams fo nitrogen gas (N2) into moles using its molar mass and the following formula: moles = mass/molar mass
molar mass of N2 = 28 g/mol
moles = 23.5/28 = 0.839 moles
Now let's use the formula PV = nRT
where:
P = ???
V = 8.5 L
n = 0.839 moles
R = 0.082 atm.L/K.mol
T = 298 K
P x 8.5 = 0.839 x 0.082 x 298
P = 20.51/8.5
P = 2.41 atm
Answer: the pressure is 2.41 atm
If 2 L of gas has a pressure of 6 atm at 27⁰C. what is the temperature in Celsius if the pressure is decreased to 2.5 atm and the volume is changed to 0.66L?
3.7 degree celsius
Explanations:According to ideal gas equation;
[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]where:
• P1 and P2 are the initial and final pressure
,• V1 and V2 are the initial and new volume
,• T1 and T2 are the initial and final temperature
Given the following parameters
[tex]\begin{gathered} P_1=6atm \\ V_1=2L \\ T_1=27^0C \\ P_2=2.5atm \\ V_2=0.66L \end{gathered}[/tex]Required
Final temperature T2
Substitute
[tex]\begin{gathered} T_2=\frac{P_2V_2T_1}{P_1V_1} \\ T_2=\frac{2.5\times0.66\times27}{6\times2} \\ T_2=\frac{44.55}{12} \\ T_2\approx3.7^0C \end{gathered}[/tex]Therefore the new temperature in Celsius is 3.7 degree celsius
Nitrogen is the central atom in molecules of nitrous oxide N2O. The Lewis structure for another possible arrangement is shown here. Assign form charges to each atom
There are two surrounding atoms and no lone pair of electrons in the nitrogen-centered nitrous oxide molecule. The valence shell of the nitrogen atom has 5 electrons, while the molecule has 2 nitrogen atoms. Thus, nitrogen atoms contribute 10 electrons.
Nitrous OxideThe use of nitrous oxide as a propellant is widespread, with everything from rocketry to whipping cream among its many uses. It is used recreationally because of its tendency to produce a fleeting "high"; nevertheless, most users are unaware of its neurotoxicity and ability to harm the nervous system. Laughing gas, often known as nitrous oxide (N2O), is a popular safe anesthetic used in dentistry, emergency situations, and labor. Since five years, there has been a sharp rise in recreational N2O use, particularly in the dance and festival scenes.To learn more about Nitrous Oxide refer:
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Need some help on this please!
The energy levels from lowest to highest energy is 1s, 2s, 2p, 3s, 3p, 4s, 3d and is therefore denoted as option A.
What is Energy level?This is referred to as a fixed distance of electrons from the nucleus of an atom and is the energy an electron has when it is above ground state and starts with the 1s.
The appropriate energy level from the least to the highest is in the order of 1s, 2s, 2p, 3s, 3p, 4s, 3d and they have the distinct number of electrons they contain thereby making option A the most appropriate choice.
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Study the reactions.What factor would only affect the rate of the third reaction.
Answer
The surface area of the reactants.
Explanation
The reactants of reaction III exists in both solid and liquid states, when solids and liquids react, increasing the surface area of the solid will increase the reaction rate. A decrease in particle size causes an increase in the solid’s total surface area.
Therefore, the only factor that would affect only the third reaction is:
The surface area of the reactants.
The last option is the correct answer.
Which of the following are gamma rays NOT used for?`A. None of theseB. Industrial imagingC. Medical imagingD. Sterilization
Answer
A. None of these
Explanation
Gamma rays are ionizing electromagnetic radiation, obtained by the decay of an atomic nucleus. Gamma rays are more penetrating, in the matter, and can damage living cells to a great extent. Gamma rays are used in medicine (radiotherapy), industry (sterilization and disinfection), and the nuclear industry.
Thus, gamma rays are used for all the options given in B - D. So the correct answer is option A. None of these
What step comes after the observation stage in the scientific method?
• asking questions about the observation
• interpreting data
• writing a theory
• publishing your results
The step comes after the observation stage in the scientific method
asking questions about the observation.What is scientific method?The scientific method is the process of objectively establishing facts through testing and experimentation. The basic process involves making an observation, formulating a hypothesis, making a prediction, conducting an experiment and finally analysing the results.
7 steps of the scientific methods are
Make an observation. Ask a question. Form a hypothesis or testable explanation. Make a prediction based on a hypothesis. Test prediction. Iterate: Use the results to make new hypotheses or predictions.To learn more about scientific method, refer;
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The mole fraction of iron(II) bromide, FeBr2, in an aqueous solution is 6.15×10-2. The percent by mass of iron(II) bromide in the solution is what %?
First, let's put the info into symbols:
[tex]\begin{gathered} X_{FeBr_2}=\text{ 6.15*10}^{-2} \\ \end{gathered}[/tex]As the mole fractions have to add up to 1, we can calculate the water mole fraction, substracting:
[tex]X_{H_2O}=\text{ 1-6.15*10}^{-2}=0.9385[/tex]If we make the supposition that we have 1 mole of the solution, we would have the next quantities of each substance:
[tex]6.15*10^{-2}\text{ moles of FeBr}_2\text{ and 0.9385 moles of water. }[/tex]Now, we can convert these moles into mass through the molecular weight of each substance:
[tex]\begin{gathered} M.W\text{ of water: 2*1+16=18 g/mole} \\ M.W.\text{ of iron \lparen II\rparen bromide: 56+80*2=216 g/mole} \\ \\ 6.15*10^{-2}moles\text{ FeBr}_2*\frac{216\text{ g}}{1\text{ mole}}=\text{ 13.284 g FeBr}_2 \\ \\ 0.9385\text{ moles H}_2O\text{ * }\frac{18\text{ g}}{1\text{ mole}}=16.893\text{ g H}_2O \end{gathered}[/tex]Now, we can calculate the mass percentage, because we have the mass of the substrate and the mass of the solution (the addition of water and iron (II) bromide):
[tex]\%\text{ m/m FeBr}_2=\frac{13.284\text{ g}}{13.284g+16.893g}*100=44.020\text{ \% m/m}[/tex]The answer is that the %m/m of iron bromide in the solution is 44.020%
A solution of 2.95 g of solute dissolved in 25.0 mL of H2O at 25°C has a boiling point of 100.300°C. What is the molar mass of the solute if it is a nonvolatile nonelectrolyte and the solution behaves ideally (d of H2O at 25°C = 0.997 g/mL)?
To solve this we must know the concept behind the phenomenon of elevation in boiling point when a non volatile solute is added to any solvent, the molar mass of solute is 115.40g
What is elevation in boiling point ?Whenever a non volatile solute is added to a solvent then the boiling point of solvent increases
Mass of solution = volume× density
= 25.0 mL×0.997 g/mL
=24.925g
= 0.024Kg
ΔT= Kb× molality
100.300-100=0.512×m
0.58=m
0.58×0.024=mole
0.013=mole
mass =given mass÷ mole
= 1.50÷0.013
= 115.40g
Thus the molar mass of solute is 115.40g
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polyester is made by reacting which two chemicals?- acid and ester - acid and ketone - aldehyde and ketone- acid and alcohol
Let me explain this question using the following picture:
As you can notice, a polyester is formed when an acid and alcohol react together.
Therefore, the answer is acid and alcohol.
the blank the acceleration since there is blank proportionaly between them
Samples of water are taken from two swimming pools. One has a ph of 4, the other a ph of 7.4. In which pool would you rather go swimming
Between water with a pH of 4 and one with a pH of 7.4, I will rather go swimming in the one with a pH of 7.4.
What is pH?The pH of a substance is the degree of acidity of alkalinity of the substance.
The pH scale ranges from 0 to 14. A pH of 7 is considered neutral.
Any pH below 7 is acidic. The further the pH is the downside of 7, the more acidic the substance.
Any pH above 7 is considered basic. The further the pH is the upside of 7, the more basic or alkaline the substance is.
Substances with very high or very low pH are usually corrosive and will harm the human body. The human body's pH ranges between 7.35 to 7.45.
Thus, swimming in water with a pH of 4 would be totally harmful to the body. Swimming in water with a pH of 7.4 would be safe.
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please help me i need it as soon as possible its due soon
The biogeochemical cycles of the carbon, nitrogen, and phosphorus cycle interact with each other by ensuring constant exchange between living organisms and their non-living environment.
The reservoir of the carbon cycle is the ocean, the reservoir of the nitrogen cycle is the atmosphere, and the reservoir of the phosphorus cycle is rocks.
Some negative impacts of human activities on each cycle include:
Carbon cycle- air pollution and global warmingNitrogen - acid rain and soil fertility reductionPhosphorus cycle - acid and soil fertility reductionWhat is the carbon cycle?The Carbon Cycle is the most important cycle that recycles carbon between the living and non-living components of the earth.
The Carbon Cycle is one of the biogeochemical cycles.
The elements and compounds that make up nutrients move continually through the air, water, soil, rock, and living organism in ecosystems and in the biosphere in cycles called biogeochemical cycles.
The concentration of carbon in living matter (18%) is greater than in the earth (0.19%)
For life to continue, carbon must be recycled
Carbon in the abiotic environment includes:
Carbon dioxide (CO₂) in the atmosphereCO₂ dissolved in waterHCO₃⁻ present in rocks (limestone and coral) CaCO₃,Processes that release CO₂ into the atmosphere include:
Burning of Wood and fossil fuelsCellular respirationProcesses that remove CO₂ from the atmosphere include:
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If you have a gas with a volume of 45 L, pressure of 1.01 atm, and a temperature of 25 degrees Celsius what is the amount of gas you have? Answer with 3 significant figures and no units.
Answer:
Explanation:
Comment
You have to look around for the best R to use. The problem is that R has different values depending on what the units of the givens are. In this case you have
Givens
V = 45 L
P = 1.01 atmospheres
T = 25 degrees = 25oC + 273 kelvin = 298 degrees kelvin
R = 0.08206 for those givens.
Equation
PV = n * R * T
Solve
1.01 * 45 = n * 0.08206 * 278
n = (1.01 * 45) / (0.08206*278)
n = 1.99
How many grams of chlorine gas was used if 9.6 moles of Cl2 was used
Answer:
The number of grams of chlorine gas used was 681.6 g
Explanation:
Given that 9.6 moles of chlorine gas was used, we want to know the mass used
Mathematically, the mass of chlorine gas used is the product of the number of moles of chlorine gas used and the molar mass of chlorine gas
The molar mass of chlorine gas is 71 g/mol
Thus, the number of grams used will be :
71 g/mol * 9.6 mol = 681.6 g
A student measured out 0.333 moles of theobromine, CyH3N402 (MM = 180.8/mol) the
primary alkaloid found in chocolate. How many molecules of theobromide did the
student measure
Answer
2.0 x 10²³ molecules.
Explanation
Given:
The number of moles of theobromide measured out = 0.333 moles.
MM of theobromide = 180.8 g/mol
What to find:
The number of molecules of theobromide the student measured.
To go from moles to molecules, multiply the number of moles by Avogadro's number.
The Avogadro's number = 6.02 x 10²³
1 mole of theobromide contains 6.02 x 10²³ molecules.
So, 0.333 moles of theobromide measured out will have (0.333 x 6.02 x 10²³) = 2.0 x 10²³ molecules.
4. Write an equilibrium equation for the following:
A. H₂ +F₂ <-----> 2HF
B. MnO₂ + 4HCI <-----> MnCl₂ + Cl₂ + H₂O
The equilibrium expressions are written for the reactions as;
a) K =[HF]^2/[H₂] [F₂]
b) [MnCl₂] [Cl₂] [H₂O]/[MnO₂] [HCI]^4
What is the equilibrium expression?Let us note that many times it is important to see the extent to which the reactant are converted into products. The value that shows us how much the reactants are converted into products is what we call the equilibrium expression.
Given this, the equilibrium has to do with the ratio of the products to that of the reactants. In this case, we can see that the equilibrium position can be written as the ratio of the amounts of the reactants to the products raised to the power of the stoichiometric coefficients of the species involved.
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What is the molarity of a solution composed of 0.171 moles of HCl in 0.300 L of solution?A. 0.051b. 0.570 MC. 1.75 Md. 0.471 MWhat is the answer ?
In this question we are given the mols of HCl as 0.171 mols and the volume of the solution id 0.300L
we are required to find the molarrity of the solution.
molarity can by found by the equation
M = n/V
were M is Molarity and n is number of molds and V is the volume of the solution.
so the answer is
M =0.171/0.300
= 0.570 M
are stars, sound, telescopes, sunlight, air matter our not
Answer:
The Sun is a star.
Explanation:
Answer:
sound and sunlight are not considered matter but, the rest is matter
Explanation:
I have homework to do please help.
18. Nickel is a chemical element with the symbol Ni, and with an atomic number of 28, its chemical series will be classified as metal, and also a Transition metal, from period 4 and group 10. Therefore letter A
19. Subatomic particles will have a few differences among them, one of these differences is mass, because protons and neutrons have a very similar mass, but both masses are way heavier than electrons, therefore letter B is correct
A student made the Lewis dot diagram of a compound as shown.
Mg is written with two dots shown on its top. Cl is written on the right side of Mg. Cl has seven dots around it. An arrow is shown from one dot on Mg toward the vacant space around Cl. Another arrow is shown from the other dot on Mg toward the vacant space around Cl. On the top, the art title is written as Students Lewis Dot Model.
What is the error in the Lewis dot diagram? (3 points)
Another Cl should be shown around Mg that will transfer its unpaired electron to Mg.
The number of dots around Mg should be one because there is only one Cl around Mg atom.
Another Cl should be shown around Mg that will receive the second electron on Mg.
The number of dots around Cl should be six because it is receiving two electrons from Mg.
Answer: Another Cl should be shown around Mg that will transfer its unpaired electron to Mg.
Explanation:
Positive cations in a sea of delocalized electrons are found in
ionic compounds
covalent compounds
aqueous solutions of ionic compounds
metals
Positive cations in a sea of delocalized electrons are found in Metals.
So, the correct option is D.
Electricity flows take place as the structure of solid metals contains delocalized electrons as well. The aligned positive ions (cations) in the metallic structure are surrounded by a "sea" of delocalized electrons. This creates characteristics like conductivity by allowing the electrons to travel freely throughout the structure. The orbital that encompasses multiple nearby atoms contains delocalized electrons. In aromatic and mesoionic systems as well as conjugated double-bond systems, delocalized electrons can be discovered.
According to the "electron sea" hypothesis, metal atoms in solids shed their outermost electrons to arrange themselves into a regular lattice of positive metallic ions. The outside electrons do not "belong" to any one atom; instead, they create a sea or pool of delocalized electrons that are free to roam about the constant lattice of positive ions at random.
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A sample of gas occupies 3.7 L at a temperature of 250 K and a pressure of 3.0 atm. What is the new
volume when the temperature is changed to 6.9 x 10 K and the pressure decreased to 0.81 atm?
4.97 L
37.82 L
9.46 L
18.91 L
The new volume of the gas sample when the temperature is changed to 6.9 x 10 K and the pressure decreased to 0.81 atm will be 37.82 L. Option 2.
Gas lawThe problem can be solved with the general gas law.
p1v1/t1 = p2v2/t2
Where t1 = initial temperature of the gas, p1 = initial pressure of the gas, v1 = initial volume of the gas, t2 = final temperature of the gas, p2 = final pressure of the gas, and v2 = final volume of the gas.
In this case:
v1 = 3.7 L, t1 = 250 k, p1 = 3.0 atm
v2 = ?, t2 = 6.9 x [tex]10^2[/tex] K, p2 = 0.81 atm
v2 = p1v1t2/t1p2
= 3 x 3.7 x 6.9 x [tex]10^2[/tex]/250 x 0.81
= 7659/202.5
= 37.82 L
Thus, the new volume of the gas sample when the temperature and the pressure changed would be 37.82 L.
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A 0.032 mole sample of gas is contained in a 1 L container at 23 degrees Celsius. What is the pressure of the gas?
Ideal gas law is valid only for ideal gas not for vanderwaal gas. The pressure of 0.032 mole sample of gas is contained in a 1 L container at 23 degrees Celsius is 0.77atm.
What is ideal gas equation?
Ideal gas equation is the mathematical expression that relates pressure volume and temperature.
Mathematically,
PV=nRT
where,
P = pressure=?
V= volume=1 L
n =number of moles= 0.032 mol
T =temperature = 23°C=296K
R = Gas constant = 0.0821 L.atm/K.mol
P × 1 L = 0.032mole× 0.0821 L.atm/K.mol × 296K
P =0.77atm
Therefore, the pressure of 0.032 mole sample of gas is contained in a 1 L container at 23 degrees Celsius is 0.77atm.
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You are offered a case of brandy supposedly bottled in the time of Napoleon for a really great price. Before buying it, you insist on testing a sample of the brandy and find that it has a tritium content of that of newly produced brandy. How long ago was the brandy bottled? Is it likely to be authentic Napoleon-era brandy?
The most important thing to remember about tritium sights is that they gradually lose their effectiveness over time. Tritium has a half-life of about 12.5 years, so tritium sights will only be half as bright in a little more than a decade.
What is the lifetime of tritium?Tritium is radioactive and has a half-life of approximately 12.5 years, which means that half of the radioactive atoms will naturally decay during that time. Although tritium can exist as a gas under controlled conditions, it is more commonly found as a liquid, because tritium, like hydrogen, reacts with oxygen to form water.The most important thing to remember about tritium sights is that they gradually lose their effectiveness over time. Tritium has a half-life of about 12.5 years, so tritium sights will only be half as bright in a little more than a decade.To learn more about : Tritium
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Only this one question don’t need to write an entire goddam 15 sentences but just give me a correct answer
Thanks a lot
Answer:
All atoms of an element have the same number of protons, and every element has a different number of protons in its atoms. For example, all helium atoms have two protons, and no other elements have atoms with two protons
Explanation:
plus dude good luck can't believe people still do school work at this time.
What happens in a single-replacement reaction?
A single replacement reaction, also known as a single displacement reaction, occurs when one element in a molecule is swapped out for another. Starting ingredients are always pure elements combined with an aqueous compound, such as pure hydrogen gas or zinc metal.
Two pure elements and one aqueous compound or solution are required for all single-replacement reactions. The A and C in the aforementioned reaction would be pure elements. Zn + 2HCl > ZnCl2 + H2 is an example of a single-replacement reaction in detail.
You must make use of a "Activity Series" table to ascertain whether a certain single replacement will take place. A single displacement reaction will take place if the metal or halogen is above the element it would replace according to the activity series.
In a compound, one element takes the place of another to create a new material. The number of reactants and products in a single replacement reaction is equal.
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The unit for volume in W/V% questions is litres when mass is in grams. True False
The unit for volume in W/V% when mass is in grams is mililiters, g/mL, therefore this statement is false
