We can confirm that the most likely reason for astronomers to see differences in the stars they observe is that stars are at different points in their life cycles.
What is the life cycle of a star?Stars are said to have seven phases to their lives, which include them being:
nebulaProtostarMain sequence star.Red giant star.White dwarf.Supernova.Neutron star or black hole.Each of these phases of a star have vastly different characteristics and can explain the differences in the observations made by the astronomers.
Therefore, we can confirm that option 2 is correct in that the differences seen by the astronomers are likely because stars are at different points in their life cycles.
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A sample of gas has an initial volume of 20 L and an initial pressure of
2.5 atm. If the pressure changes to 3.1 atm, what is the new volume, as-
suming that the temperature remains constant?
Show your work.
The new volume of the gas is 16.3 L.
Boyle's lawBoyle's law states that the volume of a fixed mass of gas is inversely proportional to its pressure, at a constant temperature.
To calculate the new volume of the gas, we use the expression from Boyle's law.
Formula:
PV = P'V'............. Equation 1Where:
P = initial pressure of gasV = Initial volume of gasP' = Final pressure of gasV' = Final volume of gasMake V' the subject of the equation
V' = PV/P'............. Equation 2From the question,
V = 20 LP = 2.5 atmP' = 3.1 atmSubstitute these values into equation 2
V' = (20×2.5)/3.1V' = 16.13 L.Hence, The new volume of the gas is 16.3 L.
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the effect that the environment has on the learning of an organism is called
A. Law of motion
B. Hilberts function
C. Law of effect
D. Kopps law
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What are some common structures of all cells?
What is respiration explain in own words please
Answer:
The process in which we breathe out carbon dioxide and breathe in oxygen.
Explanation:
Somebody help me this pleaseeeeee
༎ຶ‿༎ຶ
Answer:
1.the highest point of the wave is the crest while lowest point is trough.
2.?
3. wave length
4. frequency
5. A is crest b is trough c is amplitude and d is wave length
7.a = this is longitudinal wave, b no = letter h represents a compression and letter I represents rarefactions , letter g represents a wave length.
8 . in transverse wave
9. longitudinal wave
10. longitudinal wave
11. transverse wave
12. ?
Select all of the examples of sound resonance. A. plucking a harp string producing a high tone B. hearing "the ocean" in a seashell held up to the ear C. wearing sound cancellation earphones to block out noise D. blowing over the opening of a bottle producing a low tone E. noticing a change in pitch of the siren as a firetruck moves past
Answer
I know the answer
Explanation:
Difference between carbon monoxide and carbon dioxide.
Answer: Number of oxygen atoms
because carbon dioxide is named CO2 which means 1 carbon 2 oxygen and monoxide is CO or 1 carbon one oxygen
Explanation:
Predict two differences in the physical properties of SiO2 and SiO4
Answer:
Answer 1) In the mixture of sand, NaCl and CaCO_{3}CaCO
3
first separation was done by dissolving the mixture in water. In the first step the NaCl will get dissolved whereas, CaCO_{3}CaCO
3
will be undissolved and sand will settle at the bottom. Here, the physical property of solubility of NaCl in water is taken into consideration. The collected water is then filtered off and evaporated to get the NaCl back from the mixture with some loss. No chemical change occurs in case of NaCl extraction from water.
Answer 2) When CaCO_{3}CaCO
3
was to be removed from the undissolved part. The chemical property of CaCO_{3}CaCO
3
was used. Where it gets dissolved in acidic medium. And this way we can extract CaCO_{3}CaCO
3
and remove sand from it. We change the chemical composition of CaCO_{3}CaCO
3
by adding HCl to the mixture and dissolve CaCO_{3}CaCO
3
to form CaCl_{2}CaCl
2
which gets dissolved into the solution of HCl. Here, first decantation occurs and then extraction is done. Second, extraction is done using potassium carbonate in it which separates CaCl_{2}CaCl
2
from sand.
Answer 3) Here, Unknown mixture of salt and sand weighed =7.52 g (before washing);
Unknown mixture of salt and sand weighed =3.45 g (after washing);
To calculate the amount of salt in it, we can simply subtract the values of before and after washing change in weights.
The property of NaCl being soluble in water it will go away with washing leaving behind the sand only, after washing.
So, Weight of salt was = 7.52g - 3.45 g = 4.07g
To find the percentage of sand that was mixed with salt =
(3.45 g sand / 7.52g of mixture) X 100 = 45.9% sand was mixed with salt.
To verify whether the correct percentage of salt and sand was calculated we can recheck the value for salt as well.
(4.07 g of salt / 7.52g of mixture) X 100 = 54.1% salt
On adding we get, 45.9% + 54.1% = 100%.
Which confirms that the calculations are correct.
Explanation:
Hope its Helps you ! : )more sugar dissolves in hot water than in cold water why?
Answer:
Sugar dissolves faster in hot water than it does in cold water because hot water has more energy than cold water. When water is heated, the molecules gain energy and, thus, move faster. As they move faster, they come into contact with the sugar more often, causing it to dissolve faster.
Explanation:
A chemist pours 500 mL of a 3.0000 molar solution of sodium hydroxide into a 3.0000 liter volumetric flask and fills the flask up with
water. What is the molarity of the new solution?
M1V1 = M2V2
M1 = 3.000 M
V1 = 0.8000 L
M2 = ?
V2 = 2.00 L
M2 = M1V1/V2 = (3.000 M)(0.8000 L)/(2.00 L) = 1.20 M
A chemist pours 500 mL of a 3.0000 molar solution of sodium hydroxide into a 3.0000 liter volumetric flask and fills the flask up with water. 1.20 M is the molarity of the new solution.
What is molarity?Molarity is also known as concentration in terms of quantity, molarity, or substance. It is a way to gauge how much of a certain chemical species—in this case, a solute—is present in a solution. It refers to a substance in unit volume for solution in terms of quantity.
The amount of moles / litre is the molarity unit that is most frequently used in chemistry. One mol/L of a solution's concentration is referred to as its molarity. It is frequently abbreviated as 1 M. When one gramme of solute dissolves in one litre of solution, the solution has a molarity of one.
M1V1 = M2V2
M1 = 3.000 M
V1 = 0.8000 L
M2 = ?
V2 = 2.00 L
M2 = M1V1/V2 = (3.000 M)(0.8000 L)/(2.00 L) = 1.20 M
Therefore, 1.20 M is the molarity of the new solution.
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Why is mtDNA so useful in forensic investigations?
Which statement about solubility is true?
A.Solubility is how much solid only will dissolve in liquid only.
B.Solubility is how much solvent will dissolve in solute.
C.Solubility is how much solute will precipitate out of solvent.
D.Solubility is how much solute will dissolve in solvent.
Answer:
C. Solubility is how much solute will dissolve in solvent.
Explanation:
Solvent dissolves solutes, not the other way around, and solids aren't the only things that have solubility, I don't see how precipitation has anything to do with this, so answer C. is the correct answer. Also, I took the test and got the answer right.
The statement that is true about solubility is "Solubility is how much solute will dissolve in solvent".
What is solubility?Solubility is the amount of solute that can be dissolved in a solvent. Generally, the solubility of most solutes increases with an increase in the temperature of the solvent.
The property that can help sugar molecules or salt crystals to dissolve is known as solubility.
Factors that affect solubility include:
Concentration of the solute
Temperature
Pressure
Polarity of the solute and the solvent
Given options are-
Solubility is how much solid only will dissolve in liquid only.
Solubility is how much solvent will dissolve in solute.
Solubility is how much solute will precipitate out of solvent.
Solubility is how much solute will dissolve in solvent.
Therefore, The statement that is true about solubility is "Solubility is how much solute will dissolve in solvent".
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I NEED HELP ASAP! I don’t know like how to draw it
Explanation:
Take the first 6 going down and that's how your gonna do it
If you weighed out 22 grams of Al2O3 on a scale, how many moles of Al2O3 is that? Show your work.
Answer: Point nine six grams per mole which are often just written G / mo L and that's the molar mass or molecular weight for al2o3 aluminum oxide.
Explanation:
Copper (II) Oxide is mixed with Zinc Iodide
Balanced Chemical Equation:
Answer:
CuO + Zn → ZnO + Cu
Explanation:
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How is anaerobic respiration helpful to you as and individual or society please answer I really need help with this don’t answer for points because I will report!!
Answer:
Anaerobic exercise uses energy that’s readily available in your muscles, because the body isn’t relying on oxygen, these strong, powerful movements can only be sustained for 10 to 15 seconds.
Explanation:
Anaerobic exercise is beneficial for good health because it:
Strengthens bones
Burns fat
Builds muscle
Maintains muscle mass, which is important for people as they age
As we age, we tend to lose muscle at a rate of about 1 percent per year after age 27, unless we actively work to slow that decline, Muscle is a metabolically active tissue and the more of it we can maintain, the more calories we can burn while at rest.
Anaerobic respiration occurs more quickly than aerobic respiration.
A major advantage of aerobic respiration is the amount of energy it releases. Without oxygen, organisms can split glucose into just two molecules of pyruvate. This releases only enough energy to make two ATP molecules.
Methanogenesis, a form of carbon-dioxide respiration, that is used to produce methane gas by anaerobic digestion. Biogenic methane is used as a sustainable alternative to fossil fuels.
Anaerobic respiration is a critical component of the global nitrogen, iron, sulfur, and carbon cycles through the reduction of the oxyanions of nitrogen, sulfur, and carbon to more-reduced compounds.
Specific types of anaerobic respiration are also critical in bioremediation, which uses microorganisms to convert toxic chemicals into less-harmful molecules to clean up contaminated beaches, aquifers, lakes, and oceans. For example, toxic arsenate or selenate can be reduced to less toxic compounds by various anaerobic bacteria via anaerobic respiration.
Hope you will find it helpful. I tried my best. Thank you.
Write the balanced equation for the reaction of sodium with water to form sodium hydroxide and
hydrogen
2 Na ( s ) + 2 H2O ( l ) = 2 NaOH ( aq ) + H2 ( g )
Here's the balanced equation
Convert 30.0g Cu(NO3)2 to moles
please help
Answer:
0.2moles
Explanation:
1 grams Cu(NO3)2 to mol = 0.159952398166305
10 grams Cu(NO3)2 to mol = 0.159952398166305
if we round that up the only valid answers are either 0.1 or 0.2
what is electrochemistry?
Answer:
The study of electricity in chemistry.
Using the reaction below, calculate how many grams of CO2 is produced from 100 grams of CH4. CH4 + 2 O2 → CO2 + 2 H2O Round your answer to the 2nd decimal place (hundredths).
Answer:
274.08 g of CO2
Explanation:
please see paper for work!
Which force controls the size of an atomic nucleus?.
Answer:
strong nuclear force
Explanation:
1, a force that acts on charged particles
2, a force that holds atomic nuclei together
3, gravity, weak nuclear, electromagnetic, strong nuclear
4, strong nuclear force
5, Gravity and the electromagnetic force have infinite ranges while the nuclear forces have very small ranges.
100% :)
Name five elements that are gases.
Answer:
oxygenhydrogenchlorinenitrogenfluorineExplanation:
They are all gases at room temperature.
Hope this helps!
why can ionic compounds
Conduct electricity ?
Explanation:
Ionic compounds conduct electricity when molten (liquid) or in aqueous solution (dissolved in water), because their ions are free to move from place to place. Ionic compounds cannot conduct electricity when solid, as their ions are held in fixed positions and cannot move.
In the graphic, X represents which
element?
12
6
2x
А
12
Magnesium
18
Argon
Ar
6
Carbon
С
Mg
The element which X represents in the given graphic is Carbon
Determining the identity of an elementFrom the question, we are to determine the element in which X represents
Comparing the given graphic with the atomic notation shown in the attachment, X has a mass number of 12 and an atomic number of 6
The element which has a mass number of 12 and an atomic number of 6 is Carbon.
Hence, the element which X represents in the given graphic is Carbon.
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What led to a change in carbon dioxide in biodome files
Answer:
The decrease of decomposers. The decrease of decomposers led to a change in carbon dioxide in biodome files.
Select all of the statements that correctly describe DNA structure:
Group of answer choices
The pyrimidine and purine bases are located on the outside of the double helix.
The sugars and phosphate groups are located on the exterior of the helix.
Base pairing will always be between a purine base and a pyrimidine base.
Two connected DNA strands will be oriented in the same direction.
Hydrogen bonds will hold two DNA strands together.
Answer:
Hydrogen bonds will hold two DNA strands together.The sugars and phosphate groups are located on the exterior of the helix.Base pairing will always be between a purine base and a pyrimidine base.I hope this helps you
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What are the four abbreviations that are used to show the states of substances in chemical reactions?
What is the constant movement
of water from the ground, to the
sky, and back again called?
A rain
B snow
C water cycle
D rain clouds
Answer:
C the water cycle
Explanation:
The water gets evaproated, then it becomes clouds and thn it makes precipitation! The correct answer is the water cycle!
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A 5.00 L sample of helium expands to 15.0 L, at which point the pressure is measured to be 0.720 atm. What was the original pressure of the gas
The original pressure of a gas that has 5.00 L of its sample expanded to 15.0 L, at which point the pressure is measured to be 0.720 atm is 2.16atm.
How to calculate pressure?The pressure of a gas can be calculated using the Boyle's law equation as follows:
P1V1 = P2V2
Where;
P1 = initial pressureP2 = final pressureV1 = initial volumeV2 = initial volumeP1 × 5 = 15 × 0.720
5P1 = 10.8
P1 = 10.8 ÷ 5
P1 = 2.16atm
Therefore, the original pressure of a gas that has 5.00 L of its sample expanded to 15.0 L, at which point the pressure is measured to be 0.720 atm is 2.16atm.
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What is the value for Delta*G at 500 K if Delta*H = 27kJ / m * o * l and triangle S=0.09 kJ/(mol* K) ? OC. Delta*G = 26.9kJ / m * o * l OB. Delta*G = - 18kJ / m * o * l O D. Delta*G = 0kJ / m * o * l OA. Delta*G = 72kJ / m * o * l
The value of the Gibbs free energy (ΔG) for the reaction given in the question is –18 KJ/mol
Data obtained from the question Temperature (T) = 500 KEnthalpy change (ΔH) = 27 KJ/mol Change in entropy (ΔS) = 0.09 KJ/Kmol Gibbs free energy (ΔG) =? How to determine the Gibbs free energyThe Gibbs free energy (ΔG) can be obtained by using the following equation as illustrated below:
ΔG = ΔH – TΔS
ΔG = 27 – (500 × 0.09)
ΔG = 27 – 45
ΔG = –18 KJ/mol
Thus, the value of ΔG for the reaction is –18 KJ/mol
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