Answer:
C since however many times you repeat an experiment, it should give the exact same results or it wouldn't be accurate enough. ex if you measure a liquid to be 77ml in USA, it should give the same when measured in Germany, same with repeating experiments.
Different results from an experiment's repetition could be due to several reasons, such as changes in conditions, measurement errors, or random variations, and do not necessarily mean the experiment is flawed or a set of results should be ignored. Both sets of results should be compared to determine potential differences.
Explanation:When an experiment is repeated and the new results are different from the original results, it's safe to assume that both sets of results may be inaccurate for a variety of reasons (Option C). This does not necessarily imply that the experiment is flawed and must be redesigned, nor that the results from the second experiment should be ignored.
In science, reproducibility and consistency are key. There could be various factors leading to differing results, such as changes in conditions, measurement errors, or random variations. It is crucial to carefully review both sets of experimental results and determine if any variables or factors might have considerably altered between the experiments. In some cases, multiple repeats of the experiment may be required to arrive at a consistent result.
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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.
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."
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
(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
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.
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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44.2124+0.81+7.335 significant digits
Answer:
44.2124+0.81 = 45.0224 + 7.335 = 52.3574
Water temperature is general cooler where?
The temperature of water is cooler in deep oceans. The temperature there goes to 0°C to -3°C below which the water freezes. The water on the surface of the oceans and deep inside it varies because of the difference in energy of the two layers. One of the widest use of cold water is air conditioning. Cold water has a higher density than warm water. Water gets colder with profundity since chilly, salty sea water sinks to the base of the sea beds underneath the less dense hotter water close to the surface.
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).
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:
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.
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.
What part of the atom takes up most of its space
Answer:
The nucleus of the atom takes up most of the space.
Explanation:
The nucleus of the atom is made up of all the protons and neutrons while the rest of it is just the electron cloud which is made up of only electrons which are so much smaller compared to the nucleus that they don't effect its mass what so ever.
can you guys help me with my homework?
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
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
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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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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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.
Chemistry-Griffin
Emma Drummond
Percent Composition
For the following compounds, determine the formula , formula mass, and percent com
SHOW ALL WORK! Example: Sodium Chloride = NaCl
Na: 1*22.990 = 22.990
(22.990/58.443)*100 = 39.34% Na
Cl: 1*35.453 = 35.453
(35.453/58.443)*100 = 60.66% CI
Formula Mass = 58.443 g/mole
1. Hydrocyanic Acid
What is the formula for hydrocyanic acid
Answer:no
Explanation:
Calculate the number of moles of Mg(NO3)2 consisting of 8.428 x 10^23 formula units of
Mg(NO3)2
Answer: 1.4 moles Mg(NO3)2
Explanation: Solution attached:
Convert the formula units of Mg(NO3)2 to moles using the Avogadro's number.
describe two ways that thermal energy transfer in earth changes the land
Thermal energy transfer shapes the Earth's surface through mantle convection causing geological activity and through the evaporation and precipitation cycle that alters landscapes.
Thermal energy transfer in the Earth can change the landscape in a number of ways. Here are two examples:
Convection in the Mantle: The Earth's mantle experiences convection currents due to the heat from the Earth's core and radioactive decay. These convection currents can lead to the movement of tectonic plates, resulting in geological activities such as earthquakes and volcanic eruptions that alter the land.Water Evaporation and Precipitation: Thermal energy from the sun causes evaporation of water from the Earth's surface. When this water vapor condenses, it can lead to precipitation that can contribute to soil erosion or the alteration of landscapes through the formation of rivers and valleys.In summary, the process of convection within the Earth's mantle and the evaporation and precipitation cycle are crucial for understanding how thermal energy transfer can shape the Earth's surface over time.
Are there any plans for controlling or removing zebra mussel
Answer: no
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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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.
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
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.
The field at BBVA Compass Stadium is 110 yards long. Convert this to feet.
Answer:
330
Explanation:
110 times 3
The 110 yards length of the field at BBVA Compass Stadium is equivalent to 330 feet when converted using the fact that 1 yard equals 3 feet.
Explanation:The length of the field at BBVA Compass Stadium in question is 110 yards. We can convert yards to feet by using the fact that 1 yard is equivalent to 3 feet.
Therefore, multiplying 110 yards by 3 yields a result of 330 feet.
This conversion is commonly utilized because yards and feet are both units used in the US customary system of measurement, thus are commonly interchangeable depending on the context or the precision required.
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How many atoms would be contained in 549 grams of zinc
Answer:
5.05 × 10²⁴ Zn Atoms
Explanation:
In order to find the number of atoms we will follow these two steps;
Step 1: Finding out the moles of Zn as;
Moles = Mass / A. Mass
Moles = 549 g / 65.38 g/mol
Moles = 8.397 moles
Step 2: Calculating No. of Atoms as:
According to Avogadro's Law, each mole contains 6.022 × 10²³ particles. These particles can be any entity i.e. atoms, molecules, formula units, ions e.t.c. So,
No. of Atoms = Moles × 6.022 × 10²³ atoms/mol
No. of Atoms = 8.397 mol × 6.022 × 10²³ atoms/mol
No. of Atoms = 5.05 × 10²⁴ Zn Atoms