Answer:
A
Explanation:
it has 7 valence electrons and 4 electron shells.
why is it important to tap the side of the eudiometer tube before reading the volume of gas collected
It is important to tap the side of the eudiometer tube before reading the volume of gas collected because it helps to settle any bubbles that may be present in the gas sample.
Bubbles can form in the gas sample during the collection process, for example due to temperature or pressure changes, and can cause inaccuracies in the measurement of the volume of gas. If bubbles are present when the volume of gas is measured, it can lead to overestimation of the volume of gas collected. By tapping the side of the eudiometer tube, the bubbles will rise to the top and can be removed by opening the tube or by releasing the pressure. This will ensure that the volume of gas measured is an accurate representation of the amount of gas that was collected, and not affected by the presence of bubbles. This is important for obtaining precise and accurate results in experiments that use eudiometer tubes.
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calcium reacts with sulfur forming calcium sulfide. what is the theoretical yield (g) of cas(s) that could be prepared from 7.72 g of ca(s) and 2.04 g of sulfur(s)?
Theoretically, 7.72 g containing ca(s) as well as 2.04 g of even more sulfur may be combined to produce 2.88 g of cas(s) (s).
Describe sulfur.Among the most rectifiers is sulfur (S), sometimes spelt as sulfur, a nonmetallic chemical element in the oxygenation member (Group 16 [VIa] of the atomic numbers). Natural sulfur is a pale yellow substance that is brittle, flavorless, and odorless.
Where can you find sulfur?Sulfur can be found naturally and now in metal bauxite ore. Natively, it can be found close to hot springs and volcanoes. The tenth most prevalent element, selenium is found in asteroids, the ocean, the crust of the earth, and the atmosphere.
balanced equation,
Ca + S ---> CaS
stoichiometry of Ca to S is 1:1
= Ca moles - 1.6 g/ 40 g/mol
= 0.04 mol
= S moles - 4.25 g / 32 g/mol
= 0.13 mol
stoichiometry of Ca to CaS is 1:1,
= CaS moles formed - 0.04 mol
= mass of CaS - 0.04 mol x 72 g/mol
theoretical yield = 2.88 g
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Which term describes the molecule shown below?
Answer:
C
Explanation:
because i checked it in the periodic table solve it and that's it
California, a city that is far inland, such as Sacramento, is typically warmer than a city near the coast, such as San Francisco agree or disagree
Answer:
correct
Explanation:
I agree that California cities that are farther inland, such as Sacramento, are typically warmer than those that are near the coast, such as San Francisco. This is because the coast has a cooling effect due to the ocean breeze and the proximity to the ocean, which helps to moderate temperatures. Inland areas, on the other hand, are farther from these cooling influences and can experience higher temperatures, especially during the summer months
Oxidation-Reduction and balancing through ion electron method. Answer choices on bottom. Can someone explain this problem how they got their answer? I having a hard time understanding oxidation and reduction reactions
The balanced equation of the redox reaction using the ion-electron method is:
3 Hg + 8 HNO₃ → 3 Hg(NO₃)₂ + 2 NO + 4 H₂OThe correct option is D.
What is a redox reaction?Redox reactions include a change in the oxidation state of the substrate. When oxidation occurs, electrons are lost, or the oxidation state increases. When a reduction occurs, electrons are gained or the oxidation state decreases.
The balanced equation of the redox reaction using the ion-electron method is given below as follows:
Hg + HNO₃ → Hg(NO₃)₂ + NO + H₂O
Hg⁰ is oxidized to Hg²⁺ by the loss of two electrons
N⁵⁺ is reduced to N²⁺ by a gain of three electrons
To balance electron loss, we add a coefficient of 3 in from of Hg and a coefficient of 8 in front of HNO₃
3 Hg + 8 HNO₃ → 3 Hg(NO₃)₂ + 2 NO + 4 H₂O
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A gas balloon has a volume of 732mL when the temperature is 45.0 °C and the pressure is 740.0
mm of mercury.
a) What will its volume be at SATP?
Answer:
The final volume will be 44.69 L
Initial volume V₁ = 106.0 L
Initial pressure P₁ = 740.0 mm of Hg
Initial temperature T₁ = 45.0⁰C
Final pressure P₂ = 780.0 mm of Hg
Final temperature T₂ = 20.0⁰C
It is required to calculate the final volume V₂
___Cr3+ + ___O2 ----> ___Cr2O3
Answer:
Explanation:
2 Cr3+ + 3/2 O2 -----> Cr2O3
30 grams of MgCl2 contains how many moles?
Answer:
Only, 0.315.
Full number: 0.31508964300342
an advantage of recycling aluminum rather than disposing of it in landfills is that aluminum can be
Answer:
Recycling aluminium uses 95% less energy than producing aluminium from raw materials like bauxite ore and it conserves energy and reduces air pollution and water pollution as well as reducing green house effects and conserving the natural resources. So the pros of recycling aluminum much out weigh the cons.
two ways can scientists exhibit ethical behavior?
Answer:
Creating products that improve people's lives.
Remaining impartial about the data while conducting experiments.
Explanation:
HELP PLEASE BOND ENTHALPY WORKSHEET
Bond energy is explained as the energy needed to destroy a bond/link. These values are positive, indicating that bond scission is endothermic.
What is bond energy?Bond energies are typically based on average bond dissociation values for species in the gas phase at a temperature of 298 Kelvin. Bond energy can be determined by measuring and calculating the enthalpy change as the molecule breaks down into atoms and ions and dividing that value by the number of chemical bonds. For example, the enthalpy change in splitting methane (CH4) into one carbon atom and four hydrogen ions divided by the four bonds (number of C-H) gives the bond energy.Bond energy is not always the same as bond separation energy. The bond energy value is the average of the bond dissociation energies within the molecule. Different amounts of energy are required to break subsequent bonds.To learn more about Bond energy from the given link:
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to make up 1 l of a 0.5 m solution of edta starting with the free acid, approximately how much 10 m naoh will have to be added to adjust the ph to 7.0? do you expect this solution to have a ph-buffering capacity? the pkas of the four acetic acid groups on edta are 2.0, 2.67, 6.16 and 10.26.
To make up 1 L of a 0.5 M solution of EDTA starting with the free acid, the pH must be adjusted to 7.0. EDTA is a weak acid with a pKa of 2.0, 2.67, 6.16, and 10.26 for the four acetic acid groups.
At a pH of 7.0, EDTA will exist in a buffered state, meaning that it will be partially protonated and partially deprotonated.
To adjust the pH of the EDTA solution to 7.0, an alkali solution such as 10 M NaOH must be added. The amount of NaOH required can be calculated using the Henderson-Hasselbalch equation:
pH = pK a + log([base]/[acid])
where [base] is the concentration of the deprotonated form of EDTA and [acid] is the concentration of the protonated form of EDTA.
At a pH of 7.0, the acid-base equilibrium of EDTA will be:
[EDTA-] = [HEDTA]
At this pH, the buffer capacity is high. Since the pKa of EDTA is close to the desired pH, the buffer will resist changes in pH caused by added acids or bases.
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A platinum bar measures 5. 0 cm long, 4. 0 cm wide,and 1. 5 cm thick. It has a mass of 700. 0 grams.
a) Calculate the volume of the platinum bar
b) Calculate the density of the platinum bar
volume of the platinum bar is 30 cm3, density of the platinum bar is 25g/cm3
It is assumed that,
750 g is the mass of a platinum bar.
L = 5 cm is the bar's length.
The width of the bar is 4 cm.
Bar width, 1.5 cm in height
V=l*b*h v=4*5*1.5=30cm3 is the volume of the bar.
The density of the platinum bar needs to be determined. Any substance's density can be calculated using:
The density of the platinum bar is 25g/cm3 and the volume of the platinum bar is 30 cm3.
So, the platinum bar's density. Therefore, this is the necessary solution.
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0. 125L of a 0. 075 M HBr solution is used to neutralize 0. 0350L of an unknown Sn(OH)2
solution. What is the molarity of the unknown Sn(OH)2 solution?
please help
To neutralize 0.0350L of an unidentified Sn(OH)2 solution, 0.125L of a 0.075 M HBr solution is utilized. The molarity of the unknown Sn(OH)2 solution is 0.268 M.
The neutralization reaction between HBr and Sn(OH)2 is as follows:
HBr + Sn(OH)2 ---> SnBr2 + 2H2O
We can use the balanced equation and the stoichiometry of the reaction to find the molarity of the unknown Sn(OH)2 solution.
From the balanced equation, we can see that for every 1 mole of HBr, 1 mole of Sn(OH)2 is consumed.
We know that the HBr solution is 0.125L and 0.075M, so the number of moles of HBr is 0.125L x 0.075M = 0.00937 moles.
Since the number of moles of HBr is equal to the number of moles of Sn(OH)2, we can use the same number of moles to find the molarity of the unknown Sn(OH)2 solution.
The quantity of solute molecules per liter of solution is known as a solution's molarity. Therefore,
Molarity of unknown Sn(OH)2 solution = moles of solute / liters of solution
Molarity = 0.00937moles / 0.0350L = 0.268 M
Therefore, the molarity of the unknown Sn(OH)2 solution is 0.268 M.
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The table below shows the time and distance of a moving car. What is the average speed of the car for the 10 minutes, expressed in meters per minute? In kilometers per hour? if u can pls put an explanation bc my teacher is rlly strict on that
The average speed of the car would be:
512 meters per minute30.12 km/hWhat is the average speed?The average speed of a moving object is the ratio of the total distance traveled by the object and the total time taken to cover the distance traveled.
The average speed can be mathematically expressed as:
Average speed = total distance/total time
From the graph, the total distance traveled by the car can be estimated as:
4800 + 320 = 5120 m
Total time = 10 minutes
Average speed of the car = 5120/10 = 512 meters per minute
5120 meters = 5120/1000 = 5.12 kilometers
10 minutes = 10/60 = 0.17 hour
Average speed of the car in kilometers per hour = 5.12/0.17 = 30.12 km/h
In other words, the average speed of the moving car in meters per minute is 512, while the speed in kilometers per hour is 30.12.
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a physical change is : a. souring of milk b. burning of gasoline c. rusting of iron d. fermentation of sugar forming alcohol e. condensation of steam
Physical changes occur in dairy products when water is simply evaporated from milk (powdered milk and sweetened condensed milk).
What is physical change?
A physical change is a change to the physical—as opposed to chemical—properties of a substance. They are usually reversible. The physical properties of a substance include such characteristics as shape (volume and size), color, texture, flexibility, density, and mass.A change in which a substance undergoes a change in its physical properties is called a physical change. A physical change is generally reversible. In such a change no new substance is formed.Physical change is a type of change where the physical properties of matter change. A change of state of matter, change in colour, odour, solubility, etc. all are examples of physical change. During a physical change, neither the composition nor the chemical nature of matter is changed.To learn more about physical change refers to;
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makes a connection with in chemistry
Knowing how atoms and molecules behave in chemical reactions in chemistry depends on understanding electron transfer processes. The transfer of one or more electrons from one species.
to another occurs in electron transfer reactions, which are closely connected to oxidation-reduction (redox) processes. Atoms' oxidation states change during redox reactions, which are chemical processes. In the process of oxidation, electrons are lost, whereas in the process of reduction, electrons are gained. In a redox reaction, an oxidizing species (the reducing agent) transfers electrons to a species that is being reduced (the oxidizing agent). The term "oxidized" refers to a species that is losing electrons, whereas the term "reduced" refers to a species that is gaining electrons.Several biological activities, including cellular respiration, photosynthesis, and biochemical reactions, depend heavily on electron transfer reactions. They are utilized in a variety of technologies, including electrochemistry, fuel cells, and batteries.
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400.0 ml of a 0.300 m solution of nacl is diluted to 900.0 ml. what is the new concentration of the solution?
400.0 ml of a 0.300 m solution of NaCl is diluted to 900.0 ml. The new concentration of the solution is 0.133 M.
Given that :
The initial concentration, C1 = 0.300 M
The initial volume, V1 = 400 mL
The final volume, V2 = 900 mL
The final concentration , C2 = ?
The final concentration can be calculated as :
C1 V1 = C2 V2
C2 = C1 V1 / V2
C2 = ( 0.300 × 400 ) / 900
C2 = 0.133 M
Thus, the concentration of the new volume with the volume of 900 mL is 0.133 M.
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krypton has a higher melting point than argon because of its group of answer choices ionic bonds. greater ionization energy. stronger dispersion forces. permanent dipole moment. hydrogen bonding.
Krypton has higher melting pointthen argon because of its stronger dispersion forces for iasondue to increase in atomic mass inter atomic attraction in these elements is only due to wekdispersion interactions. Answer for this problem is stronger dispersion forces.
The London dispersion force can be defined as a temporary attractive force due to the formation of a temporary dipole in nonpolar molecules. When the electrons of two adjacent atoms move so that the atoms momentarily become dipoles, they are attracted to each other by the London dispersion force.
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if a piece of metal has a volume of 0.00670 l and a mass of 60.0 g, what is the density of the rock in g/ml?
If the piece of the metal has the volume of the 0.00670 L and the mass of the 60 g. The density of the rock is 8955.2 g/L.
The mass of the metal = 60 g
The volume of the metal = 0.00670 L
The density is the ration the mass to the volume of the substances .
The density expression is given as :
The Density = mass / volume
Where,
The mass = 60 g
The volume = 0.00670 L
The density = 60 / 0.00670
The density = 8955.2 g/L
Thus the density of the rock is the 8955.2 g/L.
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It is very hot during the summer, so you want to go to your local pool. The meteorologist explains that the UV index for the day is extremely high. What does the UV index represent?
A. The UV index represents the wavelength of the ultraviolet rays
B. The UV index represents the speed of the light ultraviolet rays
C. The UV index represents the intensity of the ultraviolet rays
D. The UV index represents the color of the ultraviolet rays.
The correct option is (C), i.e. C. The UV index represents the intensity of the ultraviolet rays.
The UV index serves as a gauge for the UV radiation intensity from the sun. It is a scale that ranges from 0 to 11+ and it is used to indicate the level of solar UV radiation on a particular day. The higher the UV index, the stronger the sun's UV radiation and the greater the risk of sunburn and other harmful effects on the skin and eyes. It is important to pay attention to UV index when spending time outdoors, especially during summer months and at high altitude or closer to the equator where the sun is stronger.
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help pls:))!!!!!!!!!!
Answer: C
Explanation:
What is the speed of a car that travels 1000 m in 45 seconds?
Answer:
80,000km/h
Explanation:
Answer: 12.5 hope this is right.
Explanation:
How many moles of CO2 are produced when 3.9 moles of C2H2 burn in oxygen?
The 50 moles of CO2 are produced when 3.9 moles of C2H2 burn in oxygen.
What is moles?
One mole is defined as the quantity of substance that has the same number of chemical species (atoms, molecules, ions, etc.) as those contained in 12 grams of the carbon-12 isotope.
What is oxygen?
Because oxygen contains only one type of atom, it is a chemical element, which is a type of substance. Since oxygen has an atomic number of 8, it is represented by the letter O in its formal chemical formula and has eight protons in its nucleus. In nature, molecular oxygen can be discovered.
2C2H2(g) + 5O2(g) ==> 4CO2(g) + 2H2O(g)
Next, look at the stoichiometric ratio of C2H2 to CO2. You can see it is 2 moles C2H2 produces 4 moles CO2.
Thus, 25.0 moles C2H2 x 4 moles CO2/2 moles C2H4 = 50.0 moles CO2
Therefore, 50 moles of CO2 are produced when 3.9 moles of C2H2 burn in oxygen.
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Gather data: experiment with a variety of initial partial pressure of no, no2, and n2o3. For each set of initial partial pressures, use the gizmo to determine the equilibrium partial pressures of each gas. Run three trials for each set of initial conditions. Use the data you collect to fill in the first four columns of the table. (note that some no2 molecules combine to form n2o4, so there may be less free no2 than no) I don’t quite understand what it’s asking, so some clarification would be nice
The task is asking you to conduct experiments to determine the equilibrium concentrations of the gases NO, NO2, and N2O3 .
Specifically, you are to vary the initial partial pressures (or concentrations) of the gases and use a gizmo (presumably some sort of laboratory instrument) to measure the equilibrium partial pressures of each gas. You should conduct three trials for each set of initial conditions and record the data in a table with four columns: the initial partial pressures of NO, NO2, and N2O3 and the equilibrium partial pressures of NO, NO2, and N2O3. It is important to note that some NO2 molecules may combine to form N2O4, so there may be less free NO2 than NO at equilibrium. This experiment is designed to study the equilibrium of the reaction: 2NO(g) + 2NO2(g) <-> 2N2O4(g); The task is asking you to study the effect of the initial concentrations of each reactant on the equilibrium concentrations of each product. The data you collect should be useful in understanding the reaction kinetics and the thermodynamics of the system.
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Do you feel that Paul Feyerabend’s belief falls more into a modernism or postmodernism method of thinking?
Yes Paul feyerabend falls more under postmodernism rather than modernism.
Paul feyerabend is considered a postmodernist philosopher of science. He is known for his critiques of the scientific method and the idea that there is a single "correct" way to do science. He argued that science is not a rational or objective enterprise, but is instead shaped by social and cultural factors. Feyerabend's views align more with postmodernism, which emphasizes the importance of context and subjectivity in understanding knowledge and reality.
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The initial concentration of [PCl3], [Cl2] and [PCl5] in a reaction vessel are 0.485M, 0.261M, and 0.399M respectively. KC= 0.500. calculate the equilibrium concentration of [cl2].
Answer:C12: 0.487 m
Explanation:
1. How many atoms of oxygen are present in 0. 04 mole NaNO3?
2. How many moles of nitrogen atoms are present in 10. 5g of N2O5?
3. How many atoms of oxygen are present in 50g of Fe(H20)2(S04)3? Please answer fast
0.12 atoms of oxygen are present in 0. 04 mole NaNO3, 2. 0.097 moles of nitrogen atoms are present in 10. 5g of N2O5, 3. 0.127 atoms of oxygen are present in 50g of Fe(H20)2(S04)3
To find the number of atoms of oxygen present in 0.04 mole NaNO3, you can use the mole ratio from the chemical formula. The formula for NaNO3 is NaNO3, which means that for every 1 mole of NaNO3, there are 3 moles of oxygen atoms. Therefore, 0.04 mole of NaNO3 contains 0.04 mole x 3 atoms/mole = 0.12 atoms of oxygen.
To find the number of moles of nitrogen atoms present in 10.5 g of N2O5, you can use the molar mass and the molar ratio from the chemical formula. The molar mass of N2O5 is 108 g/mol, and the formula for N2O5 is N2O5, which means that for every 1 mole of N2O5, there are 2 moles of nitrogen atoms. Therefore, 10.5 g of N2O5 contains 10.5 g / 108 g/mol = 0.097 moles of nitrogen atoms.
To find the number of atoms of oxygen present in 50 g of Fe(H2O)2(SO4)3, you can use the molar mass and the molar ratio from the chemical formula. The molar mass of Fe(H2O)2(SO4)3 is 392.18 g/mol, and the formula for Fe(H2O)2(SO4)3 is Fe2(SO4)3.6H2O, which means that for every 1 mole of Fe(H2O)2(SO4)3, there are 6 moles of oxygen atoms. Therefore, 50 g of Fe(H2O)2(SO4)3 contains 50 g / 392.18 g/mol = 0.127 moles of oxygen atoms
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Based on her survey which advertising mediums will work best publicize Leslie’s in the store specials
The correct answer is printed flyers and internet .
Printed flyers and internet are two popular advertising mediums used to promote businesses. Printed flyers can be distributed directly to customers through mail or handed out in public places. This allows for a targeted approach and can be cost-effective, especially if the business is located in a small area. However, printed flyers can easily get lost or discarded, making it difficult to measure their effectiveness.
On the other hand, the internet offers a wider reach and can target a larger audience. Advertisements can be placed on websites, social media platforms, and search engines. This allows for more precise targeting based on demographics and interests. The internet also offers the ability to track and analyze the success of advertising campaigns in real-time, allowing for quick adjustments to be made to improve their effectiveness. However, the cost of internet advertising can be higher than traditional print advertising, and it may require more technical knowledge and resources to create and manage an online advertising campaign.
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Leslie wants to know which advertising medium works best to promote her electronics store. She surveys her customers over a weekend and creates a bar graph. Based on her survey, which advertising mediums will work best to publicize Leslie’s in-store specials?
What is the name of this molecule?
Answer:
D). 2-Butyne
Explanation:
The "yne" indicates a triple bond. The "2-" says it starts on the second carbon,