3.01 x 10^23 atoms of rubidium

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.

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

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

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

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:

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

Answer:

the answer is water

Explanation:

because abiotic means non living and all of the other things are living

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.

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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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.

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

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  

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.

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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Answer:

i believe the answer is b.) carbon fixation

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.

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.

Answer: 385cm3

Explanation:

V1 = 375cm

P1 = 770mmHg

P2 = 750mmHg

V2 =?

P1V1 = P2V2

770x375 = 750xV2

V2 = (770x375) /750

V2 = 385cm3

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.

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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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).

Answer:

44.2124+0.81 = 45.0224 + 7.335 = 52.3574

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.

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:

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.

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).

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:

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.

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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Answer: no

Explanation: