Answer:
364 nm
Explanation:
The formula for the energy (E) of a photon in terms of its wavelength λ is
E = hc/λ
We can rearrange this formula to give
λ = hc/E
If E = 5.45 × 10⁻¹⁹ J, then
[tex]\begin{array}{rcl}\lambda& = & \dfrac{6.626 \times 10^{-34} \text{ J$\cdot$s} \times 2.998 \times 10^{8}\text{ m$\cdot$ s}^{-1}} {5.45 \times 10^{19} \text{ J}}\\\\& = & 3.64 \times 10^{-7} \text{ m}\\& = & \textbf{364 nm}\\\end{array}\\[/tex]
What does the number above the symbol represent?
O
A. The isotope number
O
B. The atomic mass
O
C. The atomic number
O
D. The ionic number
Answer:
D. The ionic number.
Explanation:
Whenever an element losses or gains an electron; it becomes charged, thus turns to an ion. The ion can either be positively charged when it losses an electron or negarively charged when it gains an electron. The number shows the required number of electrons gained (negative) or lost (positive).
Air temperatures change with changing heights, or altitudes, in the Earth's atmosphere. Gathering accurate data about the temperatures at different altitudes is important for predicting which of the following?
A.
when and where lightning is likely to strike
B.
if precipitation will take the form of snow, sleet, hail, or rain
C.
when and where a tsunami is likely to strike a coastline
D.
how much carbon dioxide is in the atmosphere at a particular location
B
Gathering accurate data about the temperatures at different altitudes is important for predicting if precipitation will take the form of snow, sleet, hail, or rain.
Explanation:
Usually, temperatures lower with altitude the reason clouds form when a warm humid air mass rises into the upper atmosphere. The moisture condenses into clouds in the upper atmosphere that precipitate as rain. However, when the upper atmosphere is even cooler, other types of precipitation like hail and snow will form. Hail forms when the cloud water droplet freezes to ice and coalesce while snow is more or less individual cloud water particles that are frozen. Studying the temperatures of the upper troposphere can help determine what kind of precipitation to expect.
Answer:
B.
if precipitation will take the form of snow, sleet, hail, or rain
Explanation:
Which of the following is a binary compound?
A. NH4+
B. H2SO4
C. 02
D. Cao
Answer:it’s D
Explanation:
Ca0 is the correct answer
Option D (CaO), which is a binary molecule made up of calcium and oxygen, is the appropriate response.
A chemical compound that only contains two elements is known as a binary compound. We'll examine each choice to see which is a binary compound.
A. Nitrogen (N) and four hydrogen (H) atoms make up this chemical, which is not binary because it comprises four different elements. It is an ammonium polyatomic ion.
B. H₂SO₄: Since it comprises three elements—hydrogen (H), sulfur (S), and oxygen (O)—it is not a binary compound. It is a sulfuric acid-related polyatomic chemical.
C. O₂: Because it just contains the element oxygen (O), this compound is not a binary one. It is an oxygen gas molecule, also referred to as molecular oxygen.
D. Calcium oxide (CaO) is a binary molecule because it simply consists of calcium (Ca) and oxygen (O). It's known as calcium oxide.
Therefore, option D (CaO), which is a binary molecule made up of calcium and oxygen, is the appropriate response.
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can you guys help me with my homework?
Calculate molecular mass of C2H5OH
Answer:
46
Explanation:
C=12
H=1
O=16
Therefore
(12x2)+6+16= 46
Answer: 46u
Explanation:C2= (12*2)
H5= (1*5)
O= (16*1)
H= (1*1)
Molecular Mass= C2+H5+O+H
= 24+5+16+1
= 46u
375centimetercube of a gas has a pressure of 770mmHg.find it's volume if the pressure is reduced to 750mmHg
Answer: 385cm3
Explanation:
V1 = 375cm
P1 = 770mmHg
P2 = 750mmHg
V2 =?
P1V1 = P2V2
770x375 = 750xV2
V2 = (770x375) /750
V2 = 385cm3
44.2124+0.81+7.335 significant digits
Answer:
44.2124+0.81 = 45.0224 + 7.335 = 52.3574
Which of the following is a property of basic solutions but not acidic
solutions?
A. They have a slippery feel.
B. They do not conduct electricity.
C. They change the color of indicators.
D. They have a sour taste.
Which should be kept away from heat sources? Check all that apply.
answer choices:
1 fire blanket
2 loose hair
3 chemicals marked
4 flammable clothing
5 water sources
Answer:
loose hair, flammable clothing, and all stored chemicals especially flammable liquids., should be kept away from heat.
A fire blanket is a highly flame-resistant blanket that can be used to extinguish a small fire or to wrap around a person in case of a fire and water helps put it out too.
Answer:
A.)fire blanket
Explanation:
Use the ideal gas law to calculate the pressure in atmospheres of 0.214 mol of Helium (He) at 61°C & occupying 2.53 L. You must show all of your work to earn credit. **Don't forget to convert your Celsius temperature to Kelvin. ** (4 points)
PLEASE HELP ASAP!!!!! WILL GIVE BRAINLIEST!!!!!
Pressure is 2.32 atm.
Explanation:
Ideal gas law is given as, PV = nRT
P represents pressure, V represents volume, T represents, temperature in Kelvin, R is nothing but the gas constant, its value is 0.08206 L atm mol⁻¹K⁻¹.
n represents the number of moles.
We have to convert temperature in Kelvin by adding 273 K to the given temperature in Celsius.
Temperature = 61°C + 273 K = 334 K
Plugin the values in the above equation as,
P = [tex]\frac{nRT}{V}[/tex]
= [tex]\frac{0.214 mol \times0.08206 L atm/mol K\times 334 K }{2.53L}[/tex]
= 2.32 atm
1.A telescope is a tool that helps people observe distant objects. In the simplest telescope design, incoming light hits a lens and is focused to a single point. This focused image is then magnified by a second lens so that it is roughly the same size as an observer's pupil. Which of the following wave behaviors plays the most important role in the functioning of this type of telescope?
Group of answer choices
reflection
resonance
refraction
interference
2.Pick the THREE statements that describe convex lenses.
Group of answer choices
They make the image of an object appear smaller.
Light rays spread out as they exit the lens.
They are thicker in the middle than at the ends
They make the image of an object appear larger.
They are thicker at the ends than in the middle.
Light rays converge as they exit the lens.
Answer:
it is refraction
Explanation:
Refraction plays the most important role in the functioning of this type of telescope. Therefore, the correct option is option C.
What is telescope?A telescope is a device that uses electromagnetic radiation to examine distant objects through their emission, absorption, or reflection. Originally referring only to an optical instrument that used lenses, reflectors, or perhaps a combination of the two to notice distant objects,
The earliest functional telescopes are refracting telescopes using glass lenses, which were created in the Netherlands in the early 17th century. They were employed for both terrestrial and astronomical purposes. Refraction plays the most important role in the functioning of this type of telescope.
Therefore, the correct option is option C.
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When a substance gains or loses energy, it’s _____ changes, or its _____ chafes. Theses two changes do ___happen at the time ; the temperature remains ___until the change of ____is complete.
Answer:
When a substance gains or loses energy, its temperature or state changes. These two changes do not happen with respect to time; the temperature remains the same until the change of state is complete.
Explanation:
This statement is about energy and change of the state of the matter. By gaining or losing energy, the physical state of the matter can change into one another. Melting, freezing, condensation, evaporation, sublimation, and deposition are the processes that support to change the physical state of the matter. Change in state and change in the matter do not happen at the same time. A substance gains or loses energy to reach a specific temperature and remains constant until the physical change of matter is completed.
convert 1.64 pounds to grams and miligrams
Answer:
gram: 743.8915 milligram: 743891.5
Explanation:
use google my friend
1.64 pounds is equivalent to 743.904 grams or 743904 milligrams; this is achieved by using the conversion factors: 1 pound equals 0.4536 kilograms and 1 kilogram equals 1000 grams.
Explanation:To convert 1.64 pounds to grams and milligrams, we use the fact that 1 pound is equivalent to 0.4536 kilograms, and 1 kilogram is 1000 grams. Therefore, to get the weight in grams:
1.64 lb x 0.4536 kg/lb x 1000 g/kg = 743.904 g
Now, to convert grams to milligrams, we know that there are 1000 milligrams in one gram:
743.904 g x 1000 mg/g = 743904 mg
Thus, 1.64 pounds is equivalent to 743.904 grams or 743904 milligrams.
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Why do atoms form bonds by donating, accepting or sharing electrons with other atoms?
Answer:
Atoms form chemical bonds to make their outer electron shells more stable. ... An ionic bond, where one atom essentially donates an electron to another, forms when one atom becomes stable by losing its outer electrons and the other atoms become stable (usually by filling its valence shell) by gaining the electrons.
Explanation:
Answer:
D.
Bonding gives an atom the same number of electrons as a noble gas.
Explanation:
Study Island
petrol pump attendant close the full fuel cap quickly after filling petrol in vehicles what could be the reason
Answer:
Below.
Explanation:
For safety reasons.
The fuel is very volatile and the vapour is very inflammable.
Petrol pump attendants close the fuel cap quickly to prevent the evaporation of volatile gasoline, to minimize the risk of overfills and spills, and to maintain the integrity of air gaps in fuel tanks which allows for safe expansion and contraction of the fuel.
When a petrol pump attendant quickly closes the fuel cap after filling a vehicle's tank, it is primarily to prevent the evaporation of gasoline. Gasoline is a volatile, complex mixture of hydrocarbon compounds that can easily vaporize at normal temperatures, leading to a significant loss of fuel due to evaporation. This is why the fuel cap must be securely fastened immediately after refueling.
Moreover, overfilling tanks is a safety hazard that can lead to spills, and in the presence of an ignition source, there is a potential for explosions causing serious property damage, environmental issues, and injury. Therefore, it is also important to avoid over-filling and ensure that fuel levels are appropriate, and safety measures such as securing the cap promptly are critical.
Additionally, fuel tanks, including underground storage tanks (USTs), are designed with air gaps to allow for the expansion and contraction of the liquids. This prevents the leaking of gasoline around the cap or the bursting of the tank. Closing the fuel cap tightly and quickly helps maintain the integrity of these air gaps and prevents the escape of gasoline vapors into the atmosphere.
A person tries to pour exactly one kilogram of sand onto a scale on five
different occasions. The actual amounts he pours are shown below:
0.80 kg, 0.90 kg, 1.0 kg, 1.1 kg, 1.2 kg
Which of the following best describes his results?
A. While inconsistent, his average of 1.0 kg made his results quite
accurate
O
B. His results were very consistent.
O
C. His results were both precise and accurate.
O
D. His results were very precise.
Answer:
A. While inconsistent, his average of 1.0 kg made his results quite
accurate
Explanation:
Accuracy is how close the value you gain from test or observation compared with the real value. In this test, all tests relatively close to 1kg and the average of the test is 1kg so this tool can be considered quite accurate.
The precision determines how close the value of multiple repetitions of the test. In this case, the value varies from 0.8kg to 1.2kg. The highest value is about 50% higher than the lowest value, so the range is pretty far and the test can be considered not precise.
If a disease caused one-fourth of the deer population to die, how would the rabbit population most likely be affected?
The rabbit population would get larger because of decreased competition with the deer population
The rabbit population would get smaller because of increased competition with the deer population
The rabbit population would get smaller because of decreased competition with the deer population
The rabbit population would get larger because of increased competition with the deer population
The correct answer is option c)The rabbit population would get smaller because of decreased competition with the deer population.
The likely impact of a disease causing one-fourth of the deer population to die on the rabbit population can be understood through the ecological dynamics within the food web. Deer and rabbits share the same trophic level as herbivores, both relying on producers like grass and plants for sustenance. If a disease significantly reduces the deer population, it would result in decreased competition for resources, particularly food, among herbivores.
In this scenario, option C is the most plausible: "The rabbit population would get smaller because of decreased competition with the deer population." With fewer deer consuming the same resources, such as plants and grass, the rabbits may experience a decline in competition for these food sources. This might lead to an apparent reduction in the rabbit population.
It's crucial to consider the intricate connections in the ecosystem. While decreased competition might initially benefit the rabbit population, other factors such as changes in predator-prey relationships or alterations in the vegetation structure could influence the long-term dynamics.
Therefore, due to decreased competition for resources with the declining deer population, the rabbit population is likely to get smaller (Option C).
which example is an abiotic of an aquarium enviornment ? A. water
B.bacteria C. sunfish D. coral HELP ASAPN PLEASE!!!! D:
Answer:
the answer is water
Explanation:
because abiotic means non living and all of the other things are living
N2+3H2-2NH3
calculate the number of grams of NH3 are formed when 3.0 mole of N2 is reacted with 6.7 moles of H2
102 grams of ammonia is formed when 3 moles of nitrogen and 6.7 moles of hydrogen reacts.
Explanation:
The equation given is of Haeber's process in which the nitrogen is limiting factor in the ammonia formation and hydrogen if in excess gets delimited.
We know that 1 mole of Nitrogen gives 2 moles of ammonia.
We have 3 moles of nitrogen here,
So, 6 moles of ammonia will be form
so from the formula
no of moles=mass/atomic mass
mass= no. of moles*atomic mass
= 6*17
= 102 grams of ammonia will be formed.
So, 6 moles or 102 grams of ammonia is formed when 3 mole of nitrogen and 6.7 mole of hydrogen reacts.
Which of the following is the first stage of the photo-independent reaction?
carbon cycle
carbon fixation
carbon sink
carbon source
Answer:
i believe the answer is b.) carbon fixation
30. a. How do the properties of metals differ from those
of both ionic and molecular compounds?
b. What specific property of metals accounts for their
unusual electrical conductivity?
Answer:
Explanation:
A. Metals are shiny, usually solid at room temperature, malleable, ductile, and highly conductive. In contrast, ionic compounds are brittle. Molecular compounds are often gases at room temperature.
b. Metals have very few valence electrons. Their outermost p-orbitals are empty. This allows their electrons (including those from their d-orbitals) to move freely between metal atoms. The movement of electrons is electricity, so this mobile "sea of electrons" is what causes metals' conductivity.
Animals have learned and innate behavioral adaptations.
Which example is a learned behavioral adaptation of an animal?
O a stickback behaving aggressively
O spiders building webs
O birds building nests
O lions hunting for food
Final answer:
Lions hunting for food is an example of a learned behavioral adaptation, while the other provided options (stickleback behavior, spider web building, and bird nest building) represent innate behaviors.
Explanation:
When considering the examples provided, one stands out as a learned behavioral adaptation, and that is lions hunting for food. Unlike the other examples that are innate behaviors, lions have to learn and perfect their hunting techniques through experience. Spiders building webs, sticklebacks behaving aggressively, and birds building nests are all examples of innate behaviors, which don't vary significantly among individuals of the same species and do not require learning.
Learned behaviors, such as habituation and imprinting, are crucial to the survival and adaptation of animals as they can adjust their actions based on environmental cues and past experiences.
100 points bc why not :P Which statement best describes heating by radiation?
Sunlight travels through space without the aid of fluids or solids.
Warm air rises and takes heat with it; eventually it cools and sinks.
Air molecules touch the warm ground, heating them up.
Air at the equator rises and sinks at the poles.
Answer:
Sunlight travels through space without the aid of fluids or solids.
Explanation:
By definition, radiation is transfer of heat without a medium.
All other options are have convection involved in them, not radiation.
Answer:
Sunlight travels through space without the aid of fluids or solids
Explanation:
what information can be learned about atoms of different elements by examining the periodic table
Answer:
The periodic table tells you the atomic number (which tells you the number of protons and electrons). It also includes the mass number, which is the sum of the protons and neutrons in the nucleus of an atom.
The periodic table provides information about the atomic number, atomic mass, electron configuration, group, and period of elements, allowing you to learn about atoms of different elements.
Explanation:By examining the periodic table, you can learn important information about different elements and their atoms. The periodic table provides information about the atomic number, symbol, atomic mass, and electron configuration of each element. For example, the atomic number tells you the number of protons in an atom, while the electron configuration gives you information about the arrangement of electrons in different energy levels. Additionally, the periodic table also allows you to determine the group and period of an element, which can provide insights into its chemical properties.
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Simplify this expression 1-c+4c-29
Answer:
1-c+4c+c=-28+3c
Explanation:
since,the expression can be solved,solve it and gain your answer.Don't truly trust me though.
Final answer:
The expression 1-c+4c-29 is simplified by combining like terms to get 3c-28.
Explanation:
The expression provided by the student is 1-c+4c-29. To simplify this expression, we combine like terms. The terms that contain 'c' can be combined, and the constants can also be combined. We start by adding together the coefficients of 'c', which gives us 3c (since -c + 4c = 3c). Then, we combine the constants 1 and -29, which gives us -28. So simplified, the expression is 3c - 28.
(g/mo)
Your answer
0 This is a required question
Using the balanced chemical equation below, how many moles of methane 1 point
will react to produce 3.2 moles of water? *
** Answer in numerical numbers only. Do not include units. (answer MUST include the correct
number of significant figures for *ANY* credit)
CH4 + 20, → CO2 + 2H,0
Your answer._______
Answer:
1.6mol
Explanation:
CH4 + 2O2 → CO2 + 2H20
From the equation,
1mole of CH4 reacted to produce 2moles of H2O.
Therefore Xmol of CH4 will react to produce 3.2moles of H2O i.e
Xmo of CH4 = 3.2/2 = 1.6mol
Therefore, 1.6mol of CH4 will react to produce 3.2moles of H2O
Potassium is isotopic and has RAM of 39.5 work out the percentage abundance of each isotope in a given sample of potassium which is found to contain 3 isotopes of K-39, K-40 and K-38 with the abundance of K-38 being 0.01%
Yo sup??
Let the percentage of K-39 be x
then the percentage of K-40 is 100-(x+0.01)
We know that the net weight should be 39.5. Therefore we can say
(39*x+40*(100-(x+0.01))+38*0.01)/100=39.5
(since we are taking it in percent)
39*x+40*(100-(x+0.01))+38*0.01=3950
39x+4000-40x-0.4+0.38=3950
2x=49.98
x=24.99
=25 (approx)
Therefore K-39 is 25% in nature and K-40 is 75% in nature.
Hope this helps.
What happens to the biomass as energy decreases up the food pyramid?
Answer & Explanation:
Energy is transferred throughout the food chain as animals at lower trophic levels are consumed by those at higher trophic levels. ... Therefore, at each stage of the food chain, less energy and biomass is transferred between organisms than at the previous trophic level.
i love your pfp
Calculate the molar mass of a gas if an 8.06×10(to the power of -2) gram sample of it occupies .0650 L at 547°C and 70.5 kPa
Answer:
M.Mass = 120 g/mol
Explanation:
Data Given:
Volume = V = 0.0650 L
Temperature = T = 547 °C = 820.15 K
Pressure = P = 70.5 kPa = 0.695 atm
Gas Constant = R = 0.082057 L.atm.mol⁻¹.K⁻¹
Formula Used:
Assuming that the gas is ideally then according to ideal gas equation,
P V = n R T
Solving for n,
n = P V / R T
Putting Values,
n = (0.695 atm × 0.0650 L) ÷ (0.082057 L.atm.mol⁻¹.K⁻¹ × 820.15 K)
n = 6.71 × 10⁻⁴ moles
Now, Knowing that,
Moles = Mass / M.Mass
Or,
M.Mass = Mass / Moles
Putting values,
M.Mass = 8.06 × 10⁻² g / 6.71 × 10⁻⁴ mol
M.Mass = 120 g/mol
Are there any plans for controlling or removing zebra mussel
Answer: no
Explanation: