Answers
Tantalum: 2
Niobium: 3
Dubnium: 1
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Related Questions
you decide to test your pillbugs' preference for an acidic environment versus a nonacidic environment. on one side of the chamber you place filter paper moistened with water. what is appropriate to place on the other side to test this variable?
Answers
you decide to test your pillbugs' preference for an acidic environment versus a nonacidic environment. on one side of the chamber you place filter paper moistened with water. Dry filter paper is appropriate to place on the other side to test this variable.
ABOUT PILLBUGSArmadillidiidae (Pillbugs) is a family of woodlice, a terrestrial crustacean group in the order Isopoda. Unlike members of some other woodlice families, members of this family can roll into a ball, an ability they share with the outwardly similar but unrelated pill millipedes and other animals. This ability gives woodlice in this family their common names of pill bugs or roly polies.Other common names include slaters, potato bugs, and doodle bugs. Most species are native to the Mediterranean Basin, while a few species have wider European distributions. The best-known species, Armadillidium vulgare, was introduced to New England in the early 19th century and has become widespread throughout North America.
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you are performing bag-mask ventilations with oxygen connected and set at a flow rate of 15 l/min. what percentage of oxygen are you delivering?
Answers
While performing bag- mask ventilation with oxygen connected with the oxygen flow at 15 L / Min, then it will provide 90 tp 95% of oxygen.
In the Bag-valve-mask ventilation, Bag valve mask devices are the preferred equipment to deliver positive pressure ventilation to the apneic patient. Every dental office must have the ability to deliver oxygen with positive pressure. This may be accomplished with either oxygen-powered resuscitators bag valve mask devices. During positive pressure ventilation, there is always a significant risk for gastric distention and subsequent regurgitation or vomiting. This is due to the fact that when oxygen is introduced into the pharynx via positive pressure.
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Imagine an electric stove where a setting of 6 heats the coil, but it still appears black. When the dial is turned to 7, the coil begins to noticeably glow red, which means that the power density of the radiation at 700 nm (visibly red) surpassed a threshold. At what approximate temperature is the coil when it begins to glow red? Assume the human eye can only perceive a glow when the power density of light reaches a minimum of 10 W/m2/μm (where y-axis units appear in the simulation in terms of megawatts (MW/m2/μm)). Express the temperature in degrees Celsius to two significant figures
Answers
The temperature of the coil when it begins to glow red is approximately 6.67 x \(10^{-3\) K, which is equivalent to -270.45 degrees Celsius.
The power density of light at a particular wavelength is proportional to the radiation intensity at that wavelength, which is inversely proportional to the square of the distance from the source. Therefore, to find the temperature of the coil when it begins to glow red, we need to find the power density of the radiation at 700 nm and then calculate the distance from the coil to the human eye and the power density at that distance.
The power density of light at a particular wavelength is given by the equation P = I * λ * 4, where I is the radiation intensity and λ is the wavelength. At 700 nm, the power density of light.
Distance from the coil to the human eye, we need to know the size of the human eye and the angle at which it is viewing the coil. Assuming the human eye has a diameter of 25 mm and is viewing the coil at an angle of 30 degrees, the distance from the coil to the human eye is given by:
distance = 25 mm * sin(30 degrees) = 52.3 mm
Now we can calculate the power density of the radiation at a distance of 52.3 mm from the coil using the power density equation:
T = (h * c) / (λ * 10 W/m/μm)
= 6.67 x \(10^{-3\) K
Therefore, the temperature of the coil when it begins to glow red is approximately 6.67 x \(10^{-3\) K, which is equivalent to -270.45 degrees Celsius.
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certain c-h groups can form weak hydrogen bonds. why would such a group be more likely to be a hydrogen bond donor group when the c is next to n
Answers
Answer:
C-H groups can form weak hydrogen bonds and such compounds are more likely to have hydrogen bond donor groups because the hydrogen group is highly polar which is bonded to a strongly electronegative atom such as carbon, nitrogen and oxygen.
As the atom bonded with hydrogen atom have an equivalent partial negative charge, so it can only accept H-bonds from other atoms.
Thus, c-h groups forming weak hydrogen bonds are more likely to be hydrogen bond donor group.
A hydrogen atom is excited from its ground state to the n= 4 state. The atom subsequently emits three photons, one of which has a wavelength of 1882 nm. What are the wavelengths of the other two photons?
Answers
The wavelength of the first line (n=4 to n=3) in the Balmer series is 656.3 nm. The wavelength of the second line (n=4 to n=2) in the Balmer series is 486.1 nm. The wavelength of the third photon, calculated above, is 594.1 nm.
The hydrogen atom has a single electron in its shell. Electrons in a hydrogen atom have a set of allowed energy levels. The ground state has the lowest energy level, and n represents the electron's energy level in the hydrogen atom.
Electrons gain energy and rise to a higher energy level when they are stimulated by energy from an external source such as an electric current or a photon beam.The hydrogen atom is said to be excited when its electron absorbs energy and rises to a higher energy level.
The excited atom then emits the energy in the form of electromagnetic radiation, which includes visible light and other wavelengths.The hydrogen atom has a characteristic spectrum due to the transitions between its energy levels. The wavelengths of photons absorbed or emitted when electrons in a hydrogen atom move between energy levels are determined by the following equation:
E=(hc)/λ whereE = energy of the photonh = Planck's constanctc = speed of lightλ = wavelength of the photonLet us now determine the wavelengths of the other two photons. When a hydrogen atom is excited from its ground state to the n=4 state, it emits a series of spectral lines known as the Balmer series.
The Balmer series is a series of lines in the visible light region of the spectrum. The wavelength of the first line (n=4 to n=3) in the Balmer series is 656.3 nm. The wavelength of the second line (n=4 to n=2) in the Balmer series is 486.1 nm.The third photon's wavelength can be calculated as follows
:Energy of the photon = (hc)/λEnergy of the photon = (6.626 x 10^-34 J s) x (2.998 x 10^8 m/s) / (1882 x 10^-9 m) = 3.328 x 10^-19 JThe wavelength of the third photon is calculated as follows: Energy of the photon = (hc)/λ3.328 x 10^-19 J = (6.626 x 10^-34 J s) x (2.998 x 10^8 m/s) / λλ = (6.626 x 10^-34 J s) x (2.998 x 10^8 m/s) / (3.328 x 10^-19 J)λ = 594.1 nmThe first two wavelengths are given by the Balmer series.
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If a 454.4 g sample of chlorine gas (MM = 71.0 g/mol) was
reacted with excess hydrogen at 565 K and 2.30 atm, how
many grams of hydrogen chloride gas (MM = 36.5 g/mol) are
produced?
Answers
Answer:
Isabelle is taking a survey to find the most popular music group of students in her community. Which of these is not a way for her to get a representative sample of this information?
ask every tenth student she sees ac a concert
ask every fifth student entering her school in the morning
ask every third student she encounters at the mall
ask every student at a local movie theater
Explanation:
Write each chemical bond or elements of the chemical formula:2Mg + O2 -> 2MgO As a Lewis dot structure (while still in the formatting of the chemical formula).
Answers
1) Chemical formula
\(2Mg+O_2\rightarrow2MgO\)2) Mg Lewis structure
3) O2 Lewis structure
4) MgO Lewis structure
5) Chemical formula written as Lewis dot structure
.
when warm air contains all the water vapor it can hold and then the air cools down the vapor becomes liquid water or ice in a process called?
Answers
When warm air contains all the water vapor it can hold and then cools down, the process by which the vapor turns into liquid water or ice is called condensation.
Condensation occurs when the air temperature drops below the dew point, which is the temperature at which the air becomes saturated with water vapor. During the process of condensation, water molecules in the air begin to slow down and lose energy, causing them to come together and form clusters. As these clusters grow in size, they eventually become visible as liquid water droplets or ice crystals.
Condensation plays an important role in the water cycle, as it is the process by which water vapor in the atmosphere is transformed into precipitation, such as rain, snow, and sleet. In addition, condensation is responsible for the formation of fog and dew, which occur when water vapor condenses directly onto surfaces such as grass, leaves, and windows.
Overall, condensation is a natural and essential process that helps to regulate the amount of moisture in the air and provides us with the water we need for our daily lives.
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Match the pictures -
element
mixture
compound
?
Answers
Answer:
Explanation:
1. It is an element since it has only one type of atom
2. It is a compound because 2 types of atoms are chemically bound
3. It is a mixture because it has 2 types of atoms which aren't bound
Answer:
First picture: Element
Second picture: Compound
Third picture: Mixture
Explanation:
First picture:
It represents an element as all the atoms are the same.
Second picture:
The other type of atoms are shown as chemically bonded to the green atoms — in the diagram the green atoms and pink atoms are touching.
Third picture:
It is representing a mixture as the other atoms are not chemically bonded together with the green atoms — the green and orange atoms are seperate and are just mixed
Solve the following problem and round the correct number of significant
figures?
4.5 x 2.34 = ?
Answers
Answer:
4.5 + 2.34 = 6.8
Sig Figs:
2
Decimals:
1
Scientific Notation:
6.8 × 10ⁿ
Words:
six point eight
()3C− − on reaction with HI gives () − − as
the main products and not () − and −
Answers
3C⁻⁻ on reaction with HI gives I⁻⁻⁻ as the main products and not H⁻ and C₂H₅I.
When 3C⁻⁻ is reacted with HI, the reaction product obtained is I⁻⁻⁻ as the main product. The C₂H₅I and H⁻ are not produced in significant quantities and cannot be considered the main product.The 3C⁻⁻ compound reacts with HI in the presence of a solvent to produce hydrogen gas, H⁻, C₂H₅I, and I⁻⁻⁻. The primary product obtained is I⁻⁻⁻ because it is stable and has a higher energy than C₂H₅I and H⁻.However, the reaction can be controlled to obtain C₂H₅I and H⁻ as the primary products by changing the reaction conditions. The reaction must be carried out in anhydrous conditions and at a low temperature so that the reaction proceeds in the desired direction.
3C⁻⁻ on reaction with HI gives I⁻⁻⁻ as the main products and not H⁻ and C₂H₅I. However, the reaction can be controlled to obtain C₂H₅I and H⁻ as the primary products by changing the reaction conditions.
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Which liquid is the most viscous?
Answers
Answer:
One of the most viscous liquids known is pitch, also known as bitumen, asphalt, or tar.
Explanation:
This is the answer
the _________ in the equation means a reaction is happening
Answers
Please helpp!!!!
1. Covering with greases on the iron makes _____________ .
1. stopping air and water from being in contact with the iron.
2. reacting with oxygen and/or water instead of iron
3. slipping the foreign materials
2. Which substance can react with copper to make copper carbonate?
3. What is the product of the combustion reaction of lithium.
4. In presenting the evidence in the table, the variable you change is written in the ___________.
1. left column
2. middle column
3. left row
4. right column
5.The iron corrosion, rusting, can be prevented by coating with __________, __________ and __________ .
6.In the chemical reaction, the substances you end up with are different from the ones you started with is called __________.
1. are not reversible
2. create new substances
3. compound
4. mixture
7. A ______________ is a chemical reaction that happens on the surface of a metal.
1. combustion reaction
2. corrosion reaction
3. metal reaction
4. acid reaction
8.In a chemical equation, the reactants and products are ____________ from each other.
1.different
2. the same
3. separated
4. obtained
9. As silver reacts with polluted air, a black compound, _____________ is formed.
1.silver carbonate
2. silver sulfide
3. silver oxide
4. silver alloy
Answers
1) Covering with greases on the iron stops air and water from being in contact with the iron.
2) The substance that can react with copper to make copper carbonate is silver carbonate
3) The combustion of lithium produces lithium oxide
4) The table is not shown hence the question can not be answered
5) another metal, oil and grease
6) The chemical reaction creates new substances.
7) A corrosion reaction is a chemical reaction that happens on the surface of a metal.
8) .In a chemical equation, the reactants and products are different from each other.
9) As silver reacts with polluted air, a black compound, silver oxide is formed.
What is oxidation?In the process of oxidation, we are just burning up a substance in oxygen. When we burn the substance in oxygen, there is an increase in the oxidation number of the object and oxygen is also added to the object. This is what we call oxidation of a substances.
Now we know that oxygen is abundant in the universe and thus it can be used in the burning of a substances. In effect we can look at the process of combustion as a situation in which we burn an object in air.
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what term best describes the role of certain metal ions and coenzymes in metabolic processes?
Answers
The term that best describes the role of certain metal ions and coenzymes in metabolic processes is "catalyst." These ions and coenzymes act as catalysts, facilitating chemical reactions and speeding up metabolic processes within the body.
The term that best describes the role of certain metal ions and coenzymes in metabolic processes is "cofactor." A cofactor is a non-protein chemical compound or metal ion that is required for an enzyme's activity.
It plays an essential role in various metabolic processes by stabilizing the enzyme structure, facilitating substrate binding, or participating in catalytic reactions.
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What is your estimate of the strength for each clay type at 50% water content, with DI water as its pore fluid, and with brine in its pore fluid? - Is there a significant difference? If so, what physical mechanism do you think is causing the change in strength? What is the effect of salt on the shear strength of clays?
Answers
The physical mechanism causing the change in strength when using brine as the pore fluid is the presence of salt ions that weaken the interparticle bonds. Salt can reduce the shear strength of clays by increasing the repulsive forces between clay particles.
The strength of clay types at 50% water content can vary depending on whether DI water or brine is used as the pore fluid. Generally, there is a significant difference in strength between the two.
The presence of salt in brine can have an effect on the shear strength of clays. When salt is dissolved in water, it creates ions that can interact with the clay particles. These interactions can lead to the formation of electrical double layers around the clay particles, which can increase the interparticle repulsion and decrease the shear strength of the clay.
On the other hand, when DI water is used as the pore fluid, there is no presence of salt ions to affect the interparticle interactions. As a result, the clay particles can have stronger bonds and higher shear strength compared to when brine is present.
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At a given temperature and pressure, it takes 7.25 min for a 10.0-L sample of argon to effuse through a membrane. How long will it take for a 10.0-L sample of helium to effuse under the same conditions? Click the answer you think is right. A. 2.29 min B. 0.726 min C. 7.25 min
Answers
At given temperature and pressure, it takes 7.25 min for a 10.0-L sample argon to effuse through the membrane. It will take for 10.0-L sample of the helium to effuse under the same conditions is 2.29 min. The correct option is A.
The rate of diffusion for the helium, by the Graham's law:
Rate₁ / Rate₂ = √M₂/M₁
Rate for argon = volume of argon / time
Rate for argon = 10.0 L / 7.25 min
Rate for argon = 1.38 L/min
Rate of helium = rate of Ar × √M Ar / M He
Rate of helium = 1.38 L/min × √40 / 4
Rate of helium = 4.36 L/min
Time taken = volume for helium / rate for helium
Time taken = 10.0 L / 4.36 L/min
= 2.29 min
Therefore, the option A is correct.
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When a vacancy exists in an inner electron shell of an atom (as a result of photoelectric effect, Compton scattering, or bombardment by other electrons), the energy liberated when this vacancy is filled, instead of emerging from the atom as fluorescent radiation, can be transferred to another electron of the atom, thereby ejecting the electron. Such an emitted electron is called a(n) _____ electron
Answers
Answer:
The answer is "Auger".
Explanation:
The Auger effect is an effect size when the vacancy of even an atom throughout the inner shell was complemented by the release of even an electron from the same atom. Whenever a central electron is lost, a higher energy level electron can drop into the void and release energy, which can be the result.
MARKING BRAINLIEST!!!
image is attached
Answers
Answer:
2, s
Explanation:
The there will be two orbitals in the s subshell because the first orbital can only contain two electrons and there will be need of a second one
Order the potential energies for anti staggered, eclipsed, totally eclipsed and gauche isomers. Is conformation interconversion more likely at high temperatures or low temperatures
Answers
The order of potential energies for the isomers is staggered < anti < gauche < eclipsed < totally eclipsed. Conformation interconversion is more likely at high temperatures due to increased molecular motion and therefore a greater chance for the molecule to adopt a different conformation.
What factors affect the potential energy of different isomers?The order the potential energies for the different isomers, we have:
1. Anti-staggered: This conformation has the lowest potential energy because it has the least amount of steric strain and torsional strain. The groups are positioned farthest apart from each other, minimizing repulsion.
2. Gauche: This conformation has a higher potential energy than anti-staggered due to the increased torsional strain caused by closer proximity of the groups.
3. Eclipsed: The potential energy in this conformation is higher than gauche because the groups are directly adjacent to each other, causing greater torsional strain and some steric strain.
4. Totally eclipsed: This conformation has the highest potential energy as the groups are directly aligned with each other, causing maximum torsional strain and steric strain.
Regarding conformational interconversion, it is more likely at high temperatures because the increased thermal energy allows for molecules to overcome energy barriers between different conformations more easily.
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3. Which part of a cell is not found in the cytoplasm?
a. chromosomes
b. Golgi body
c. ribosome
d. vacuole
Answers
Answer:
vacuole
Explanation:
Brainliest please
A. none of the above
B. 12000 m/s
C. 0.53 m/s
D. 1.875 m/s
Answers
A. none of the above
The answer would be 180 m/s
Hope this helps! Brainliest if you can!
Given the following value, is the starting material or product lower in energy? Select the single best answer. Delta G degree = -37 kJ/mol A. starting material B. product
Answers
The answer is product.
The free energy of a thermodynamic system is referred to as the Gibbs free energy or Gibbs energy. The Gibbs free energy is a thermodynamic quantity that represents the thermodynamic system's ability to do reversible work.The formula for Gibbs energy is shown below:
ΔG = ΔH - TΔS
where:ΔG: the Gibbs free energy of the system
ΔH: the enthalpy of the systemT: the temperature of the system
ΔS: the entropy of the system
The Gibbs free energy can be calculated using the following formula:
ΔG° = - RT lnK
where:ΔG°: the Gibbs free energy at standard state
R: the gas constant
T: the temperature in kelvins
K: the equilibrium constant
The value of ΔG° determines the direction in which a chemical reaction will proceed. A negative ΔG° means that the reaction is spontaneous, while a positive ΔG° means that the reaction is non-spontaneous.
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_______ mL = 500 cm^3
Answers
Answer:
500 mL
Explanation:
500 cm is equal to 500 mL
In the reaction below, which substances are products?
Choose all that apply
5 Al(s) + 24 HCl(aq) + 3 KMnO4(aq) - 5 A1C13(aq) + 3 MnCl2(aq) + 3 KCl(aq) + 8 H20(1)
-
HCl(aq)
KMnO4(aq)
H20(1)
KCl(aq)
AlCl3(aq)
Al(s)
MnCl2(aq)
Answers
Answer:
5 A1C13(aq) + 3 MnCl2(aq) + 3 KCl(aq) + 8 H20(1)
Explanation:
the products are on the right side of the arrow
What state of matter is water at 80 degrees celsius?
Answers
Answer:
Liquid
Explanation:
Because water becomes a solid (freezes) at 0°C and becomes a gas (evaporates) at 100°C, it is liquid at any temperature in between.
in a titration experiment, a student used 24.13 ml of 0.111 m sodium hydroxide to neutralize 20.00 ml of a hydrochloric acid solution. what was the molarity of the acid solution?
Answers
A student neutralized 20.00 ml of a hydrochloric acid solution using 24.13 ml of 0.111 m sodium hydroxide. The acid solution has a molarity of 1.2065.
Explain about the Acid solution?
A liquid mixture known as an acidic solution is created when water and hydrogen ions react. The Brnsted-Lowry theory states that whereas bases "receive" hydrogen protons, acids "give" hydrogen protons. Different solutions have different levels of acidity.
Always mix acid with a lot of water. After that, the solution can be made into one liter by adding more water. If you mix 1 liter of water with the acid, the concentration will be off.
As a food preservative, vinegar, a diluted acetic acid solution, is employed. In batteries, sulfuric acid is frequently utilized. The industrial production of explosives, dyes, fertilizers, and paints uses nitric acid and sulfuric acid.
=24.13 ÷ 20.00
=1.2065
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What makes up all of the populations in an area
Answers
Answer:
The number of people in that specific area.
Explanation:
True or False:
C + 02 - CO2
In the chemical reaction above, the coefficient of oxygen is 2.
False
True
Answers
Answer:
Explanation:
From the work of Krogh in 1918 until the present time, a very wide range of values for oxygen diffusion coefficients has been reported1–5 ranging from 1.1 × 10−4 to 4 × 10−8 cm2 sec−1.
what are thermosetting plastics???
Answers
Explanation:
Thermosetting plastic are made up of long chain of molecules which are cross-linked and can be moulded into different shape and size.
Answer:
Hey!
THERMOSETTING PLASTICS are plastics or polymers that become IRREVESIBLY SET/RIGID when it has been heated and cooled...
Explanation:
This means that if you heat up a thermosetting plastic, you only have one chance to mould it or shape it before it cools down...if not you cannot correct this and will have to start again! Which WILL be sad!
AKA : THERMOSET
HOPE THIS HELPS!!