When iron melts in 912 degrees Celsius, in starting the atoms of the iron become more packed and then in 1,394 degrees Celsius, the atoms loose again and melts.
What is melting?Melting is a process by which the substance that is in solid starts to become liquid. The changing of the solid into liquid is called melting. Usually in high temperature, the substance starts to melting.
Thus, when iron melts in 912 degrees Celsius, in starting the atoms of the iron become more packed and then in 1,394 degrees Celsius, the atoms loose again and melts.
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Are there any plans for controlling or removing zebra mussel
Answer: no
Explanation:
(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
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
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).
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
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
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:
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.
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 toy balloon filled with air has an internal pressure of 126.625 kPa and a volume of 2500 mL. If I take the balloon to the bottom of the ocean where the pressure is 95 atmospheres, what will the new volume of the balloon be in mL? How many moles of gas does the balloon hold? (Assume T=285K)
Using the ideal gas law, we first calculate the number of moles in the balloon using the initial conditions and then apply the combined gas law to find the new volume under increased ocean pressure. The toy balloon will have a volume of approximately 32.89 mL at the bottom of the ocean with a pressure of 95 atm and contains about 0.129 moles of gas.
Explanation:To solve for the new volume of the toy balloon at the bottom of the ocean, we will use the ideal gas law and its principle that states the product of pressure (P) and volume (V) is proportional to the number of moles (n) and the temperature (T), represented as PV = nRT, where R is the ideal gas constant. Given the internal pressure of the balloon is 126.625 kPa (which is equivalent to 1.25 atm since 1 atm = 101.325 kPa) and the volume is 2500 mL at the surface, we can calculate the number of moles of gas in the balloon using the ideal gas constant (R = 8.3145 J/mol·K or 0.0821 L·atm/mol·K for calculations involving atmospheres) and the provided temperature of 285 K.
Calculating the number of moles:
Convert the pressure to atmospheres: 126.625 kPa / 101.325 kPa/atm = 1.25 atmUse the Ideal Gas Law to find n: P1V1/T1 = nR, thus n = P1V1 / (R*T1)n = (1.25 atm * 2.5 L) / (0.0821 L·atm/mol·K * 285 K)n = 0.129 moles (approximately)Calculating the new volume at the bottom of the ocean:
Now, we apply the combined gas law to determine the new volume (V2) when the pressure is 95 atm
Using P1V1/T1 = P2V2/T2 and solving for V2 gives us V2 = P1V1T2/(P2T1)We know T2 = T1 as the temperature is constant (285 K), so V2 = P1V1/P2V2 = 1.25 atm * 2500 mL / 95 atmV2 = 32.89 mL (approximately)The new volume of the balloon at the bottom of the ocean under 95 atmospheres of pressure would be approximately 32.89 mL, and it contains about 0.129 moles of gas.
The new volume of the balloon at the bottom of the ocean is approximately 26.75 mL, and the balloon holds approximately 0.117 moles of gas.
To solve this problem, we will use Boyle's Law, which states that for a given mass of gas at constant temperature, the volume of the gas is inversely proportional to the pressure. Mathematically, this can be expressed as:
[tex]\[ P_1V_1 = P_2V_2 \][/tex]
First, we need to convert the final pressure from atmospheres to kPa to match the units of the initial pressure. We know that 1 atmosphere is approximately 101.325 kPa.
[tex]\[ P_2 = 95 \text{ atm} \times 101.325 \text{ kPa/atm} \] \[ P_2 = 9620.875 \text{ kPa} \][/tex]
Now we can use Boyle's Law to find the new volume \( V_2 \):
[tex]\[ P_1V_1 = P_2V_2 \] \[ V_2 = \frac{P_1V_1}{P_2} \] \[ V_2 = \frac{126.625 \text{ kPa} \times 2500 \text{ mL}}{9620.875 \text{ kPa}} \] \[ V_2 \approx 26.75 \text{ mL} \][/tex]
Next, to find the number of moles of gas in the balloon, we can use the ideal gas law:
[tex]\[ PV = nRT \][/tex]
We will use the initial conditions to find \( n \):
[tex]\[ n = \frac{P_1V_1}{RT} \] \[ n = \frac{126.625 \times 10^3 \text{ Pa} \times 2500 \times 10^{-6} \text{ m}^3}{8.314 \text{ J/(mol·K)} \times 285 \text{ K}} \] \[ n = \frac{126.625 \times 2.5 \text{ J}}{8.314 \times 285} \] \[ n \approx 0.117 \text{ moles} \][/tex]
Therefore, the new volume of the balloon at the bottom of the ocean is approximately 26.75 mL, and the balloon holds approximately 0.117 moles of gas."
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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Element X and element Y have a difference in electronegativity of 1:2 will the bond XY be covalent or ionic
Answer:
The bond between XY is Covalent
Explanation:
Types of Bonds can be predicted by either identifying the two bonding elements or by calculating the difference in electronegativity.
The two atoms bonded to each other can be both metals, non-metals or one metal and the other non-metal. If both are metals then we can say that the bond is metallic. If both are non-metals then we can say that the bond is nonpolar and covalent. If one is metal and the other is non-metal then the bond between them will be ionic.
Secondly,
If, Electronegativity difference is,
Less than 0.4 then it is Non Polar Covalent Bonding
Between 0.4 and 1.7 then it is Polar Covalent Bonding
Greater than 1.7 then it is Ionic Bonding
As, the element X and Y have the electronegativity difference of 1.2 (which is less than 1.7 and greater than 0.4) therefore, we can say that the bond between them is covalent and it is polar in nature.
Final answer:
The bond between element X and Y with a significant difference in electronegativity of 1:2 is likely ionic, especially if the difference is greater than 1.8. Exact values of electronegativity and the types of elements involved would provide a more accurate determination.
Explanation:
The question concerns whether a bond between element X and element Y with a difference in electronegativity of 1:2 will be covalent or ionic. The electronegativity difference helps to predict the bond type. A higher electronegativity difference indicates more ionic character, whereas a lower difference suggests a covalent bond. Since '1:2' is not a standard way to express electronegativity, we can assume it refers to a ratio indicating a significant difference, suggesting that the bond may be ionic. However, the exact nature of the bond would better be determined if the exact electronegativity values were provided, considering that usually electronegativity differences greater than 1.8 lead to an ionic bond.
Additionally, the types of elements involved can provide a clue as to the bond type. For instance, a bond between a metal and a nonmetal often results in an ionic bond whereas a bond between two nonmetals is more likely to be covalent. Bonds with intermediate electronegativity differences are typically polar covalent, where the shared electrons are drawn more towards the more electronegative atom.
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:
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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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.
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.
44.2124+0.81+7.335 significant digits
Answer:
44.2124+0.81 = 45.0224 + 7.335 = 52.3574
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
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?
If a car goes from 20 miles per hour to 10 miles per hour in 5 seconds, find its acceleration.
A)
2 miles per hour per second
B 5 miles per hour per second
C)
-2 miles per hour per second
10-mites per reuf per second
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
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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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 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.
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:
You transfer a clear liquid from a beaker into a test tube. You heat the test tube with the unknown liquid over a Bunsen burner. The liquid begins to vaporize and after continued heating a white crystalline material is all that remains in the test tube. The test tube initially contained:
a compound
a mixture
an element
a solution
Answer:
A mixture
Explanation: I don't really have one I just know and i just can't explain it
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.
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.
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.