The composition of a galaxy is typically observed through the distribution of stars, gas, and dark matter, with galaxies containing significant amounts of low-mass stars contributing to a high mass-to-light ratio. The universe, on the other hand, is largely composed of regular matter, dark matter, and dark energy, with dark components forming 95% of its makeup and influencing the large-scale structure. Cosmologically, the universe is homogeneous and isotropic, though galaxies group into complex structures like clusters and superclusters.
Explanation:The composition of a galaxy compared to the composition of the universe is a fascinating aspect of cosmology, which is the study of the character and evolution of the universe. Within the universe, matter is distributed across approximately 10¹¹ galaxies, which form together in structures such as clusters and superclusters. The Milky Way Galaxy, as a part of the Local Group, is one of these galaxies, containing more stars and being slightly larger than the average galaxy.
While we see significant clouds of gas, stars, and a mysterious component known as dark matter in galaxies, the universe's largest composition includes regular matter, dark matter, and dark energy. Regular matter, which is familiar to us on Earth, only comprises around 5% of the universe, with most of it consisting of hydrogen and helium. Dark matter and dark energy make up the remaining 95%, and they have an immense impact on the universe's structure, but remain undetectable in Earth-bound laboratories.
Galaxies, as enormous collections of stars, gas, and other materials, have a mass-to-light ratio generally greater than 1, indicative of more mass being present than the light we can see. This is primarily due to the preponderance of low-mass stars in galaxies which contribute significantly to the overall mass without adding much light. In contrast, the Universe's composition is largely uniform and isotropic following the cosmological principle, differing primarily in its large-scale structure shaped by the distribution of dark matter and energy.
Describe how the metal probably increases the reaction rate, identify whether this is an example of homogeneous or heterogeneous catalysis, and explain how you know.
Answer:
The metal probably increases reaction rate by either holding reactant molecules in the correct orientation to react or by weakening or breaking bonds in reactant molecules to make them more reactive.
This is an example of heterogeneous catalysis.
It is heterogeneous catalysis because the catalyst is a solid and the reactants are gases. In heterogeneous catalysis, the catalyst is in a different phase than the reactants
Explanation:
got it right :)
Answer:
The metal probably increases reaction rate by either holding reactant molecules in the correct orientation to react or by weakening or breaking bonds in reactant molecules to make them more reactive.This is an example of heterogeneous catalysis. It is heterogeneous catalysis because the catalyst is a solid and the reactants are gases. In heterogeneous catalysis, the catalyst is in a different phase than the reactants.
Explanation:
Mass defect for the isotope thorium-234 = 1.85864 amu.
How many kilograms does the mass defect represent?
A) 1.85864 × 10-10 kg
B)1.12 × 10- 22 kg
C)3.09 × 10-27 kg
D)1.66 x 10-27 kg
Answer:
3.09 × 10-27 kg
Explanation:
I also had this question on edge and got it correct
Answer:
the answer is C
Explanation:
just took this on eng2020
For the reaction 2Fe + 3Cl2 → 2FeCl3 which of the following options gives the correct reactant:reactant ratio? Fe:Cl2 = 1:1 Fe:Cl2 = 2:3 Fe:Cl2 = 3:2 Fe:FeCl3 = 1:1
Answer: Fe:Cl2 = 2:3
Explanation:
Answer:
Fe:Cl2 = 2:3
Explanation:
Tim realized that when he brought a positively charged piece of cloth in contact with a negatively charged sock that they both stuck together. Why did that happen?
Answer:
Static electricity caused the it to be pulled toward each other like magnets. Also, positives and negatives attract.
Explanation:
Answer:
This was due to static electricity or electrostatic induction.
Explanation:
Electrostatic induction, is a redistribution of charges in an object caused by the electric field of a nearby charge. For example, if a positively charged piece of cloth is brought near negatively charged sock, the mobile negatively-charged electrons in the sock will be attracted by the external charge, and move to the side of the metal facing it, creating a negative charge on the surface. When the electrons move out of an area they leave a positive charge due to the metal atoms' nuclei, so the side of the metal object facing away from the charge acquires a positive charge. These induced charges disappear when the external charge is removed.
Static electricity is usually caused when certain materials are rubbed against each other, like wool on plastic or the soles of shoes on carpet. The process causes electrons to be pulled from the surface of one material and relocated on the surface of the other material.
The Ksp for Cu(OH)2 is 4.8 × 10-20. Determine the molar solubility of Cu(OH)2 in a buffer solution with a pH of 10.1.
A) 6.0 × 10-10
B) 7.6
C) 2.2 × 10-10
D) 3.8 × 10-16
E) 3.0 × 10-12
Answer:
E) 3.0x10⁻¹²
Explanation:
Ksp of Cu(OH)₂ is defined as:
Cu(OH)₂(s) ⇄ Cu²⁺(aq) + 2 OH⁻(aq)
Ksp = [Cu²⁺] [OH⁻]²
When pH is 10.1, [OH⁻] is:
pOH = 14 - pH
pOH = 3.9
pOH = -log [OH⁻]
[OH⁻] = 1.26x10⁻⁴M
Replacing in ksp formula:
4.8x10⁻²⁰= [Cu²⁺] [1.26x10⁻⁴]²
3.0x10⁻¹² = [Cu²⁺]
That means the maximum amount of Cu²⁺ that can be in solution is 3.0x10⁻¹²M, thus, molar solubility of Cu(OH)₂ is
E) 3.0x10⁻¹²
Considering only specific heat,
would be the most ideal for use in cookware.
Aluminum
Copper
Iron
Lead
Answer:
Considering only specific heat,
✔ lead
would be the most ideal for use in cookware.
However, compared to the other options, lead is too
✔ dangerous and heavy.
Considering everything,
✔ aluminum
or
✔ iron
, would make the best cookware and therefore may be the best choices overall.
Is magnesium fluoride ionic or covalent
Answer:
lonic
Explanation:
MgF2 ( Magnesium fluoride ) is ionic.
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⊕ΘΞΠΤ⊕
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Final answer:
Magnesium fluoride (MgF₂) is an ionic compound formed by the transfer of electrons from metallic magnesium to nonmetallic fluoride, resulting in Mg2+ cations and F- anions held together by ionic bonds.
Explanation:
Magnesium fluoride (MgF₂) is an ionic compound. This is because it is formed from magnesium, a metal with a low electronegativity, and fluoride, a nonmetal with a high electronegativity. The electronegativity difference between magnesium and fluoride leads to the transfer of electrons from magnesium to fluoride, creating Mg2+ cations and F- anions. These ions are held together by strong electrostatic forces, known as ionic bonds, which result in the formation of an ionic solid. Ionic compounds have certain characteristics such as high melting points due to the strong ionic bonds in their lattice structure.
Examples of other ionic compounds include KCl, NaCl, and MgCl₂, all of which are made up of a metal and a nonmetal, just like magnesium fluoride. The type of bonding in a compound like MgF₂ also leads to properties such as poor conductivity in the solid state but the ability to conduct electricity when molten. This is because the ions are fixed in place in the solid lattice but can move freely when in the liquid state.
How many forces act on each person? When they put there hands together or High five
Answer:
Left and right: two forces
Total: four forces
Explanation:
If it's just the forces that they are using it would be two the force of each person's hand on the other. However there is also gravity pulling down on their hand but they use another force to pull it up which you can call the normal force.
if this helped please hit the thanks button <3
Answer:
Left and right= two
So the total is four forces.
How many moles of molecular oxygen will be needed for the complete combustion of 100.0 g of sulfur dioxide? The product of this reaction is sulfur trioxide
Answer:
0.78 mol O2
Explanation:
2SO2 + O2 -> 2 SO3
64 g SO2 -> 1 mol SO2
100 g SO2 -> x
x= (100 g SO2 * 1 mol SO2)/64 g SO2 x=1.56 mol SO2
1 mol O2 -> 2 mol SO2
x -> 1.56 mol SO2
x= (1.56 mol SO2 * 1 mol O2)/2 mol SO2 x=0.78 mol O2
Answer:
0.7804
Explanation:
a solution has a hydronium concentration of 1.3x10^-3 M. what is the pH of the solution?
The pH of the solution with a hydronium ion concentration of 1.3x10⁻³ M is calculated to be approximately 2.886, indicating that the solution is acidic.
The pH of a solution is calculated using the formula pH = -log[H3O+], where [H3O+] is the hydronium ion concentration in moles per liter (M). Given a hydronium ion concentration of 1.3x10^-3 M, we calculate the pH as follows:
Write the concentration of hydronium ions as 1.3x10⁻³ M.
Apply the pH formula: pH = -log(1.3x10⁻³).
Calculate the logarithm: pH = -(-2.886) = 2.886.
Therefore, the pH of the solution is approximately 2.886, which indicates that the solution is acidic.
Percent composition H2S2O8
Answer:194.1411 g/mol
Explanation:
Sodium (Na) reacts with nitrogen gas (N2) to produce sodium nitride. If a student collects 2.5 moles of sodium nitride (NaN3) after the reaction has been completed, determine the number of moles of nitrogen that were initially present.
2Na + 3N2 -> 2NaN3
Your answer:
3.75 mole N2
1.2 mole N2
3.87 mole N2
Answer : The correct option is, 3.75 mole [tex]N_2[/tex]
Explanation : Given,
Moles of [tex]NaN_3[/tex] = 2.5 mol
The balanced chemical equation is:
[tex]2Na+3N_2\rightarrow 2NaN_3[/tex]
From the balanced reaction we conclude that
As, 2 moles of [tex]NaN_3[/tex] produce from 3 moles of [tex]N_2[/tex]
So, 2.5 moles of [tex]NaN_3[/tex] produce from [tex]\frac{3}{2}\times 2.5=3.75[/tex] moles of [tex]N_2[/tex]
Therefore, the moles of [tex]N_2[/tex] initially present was, 3.75 moles.
I NEED HELP ASAP! WILL MARK AS BRAINLIEST
Question: What would be a good acid-base pair from which to prepare a buffer solution whose pH is 10.3?
Answer:
Sry i am unable to see the attached picture but i hope this helps
Explanation:
There are a couple of ways to prepare a buffer solution of a specific pH. In the first method, prepare a solution with an acid and its conjugate base by dissolving the acid form of the buffer in about 60% of the volume of water required to obtain the final solution volume
Answer:10.5 a la cubica co 5 de la 8
Explanation:ok no es bromaaaaa
Which of these is the BEST way to manage a natural resource?
A.
driving in a car as much as possible
B.
always leaving the water running while brushing your teeth
C.
planting trees as they are being cut down
D.
dumping chemical wastes into nearby lakes and rivers
The answer is C.
This can be concluded by looking at the other answers and eliminating them one-by-one.
Managing (Or conserving) a natural resource means to sustain it and use it as efficiently as possible.
With this in mind, we can look and eliminate certain answers.
A is incorrect because driving a car uses gas, a natural resource. By using as much gas as possible, the resource would be wasted instead of conserved.
B is incorrect because water is a natural resource. Once again, by using this, it's wasted where it could be conserved.
C is correct because planting trees would conserve the resource; by consistently planting trees where they're cut, the chances of running out of wood decrease.
D is incorrect because both the water and the creatures that live inside it are natural resources. By dumping toxic waste, these resources are wasted where it could be conserved.
Hope this helped you! :)
Answer:
C
Explanation:
this is pretty self explanatory
What is the pH of 0.000134 M solution of HCI?
Answer: The pH will be 3.87
Explanation:
pH or pOH is the measure of acidity or alkalinity of a solution.
pH is calculated by taking negative logarithm of hydrogen ion concentration.
[tex]pH=-\log [H^+][/tex]
[tex]HCl\rightarrow H^++Cl^{-}[/tex]
According to stoichiometry,
1 mole of [tex]HCl[/tex] gives 1 mole of [tex]H^+[/tex]
Thus [tex]0.000134[/tex] moles of [tex]HCl[/tex] gives =[tex]\frac{1}{1}\times 0.000134=0.0001342[/tex] moles of [tex]H^+[/tex]
Putting in the values:
[tex]pH=-\log[0.000134][/tex]
[tex]pH=3.87[/tex]
Thus the pH will be 3.87
Answer: The pH of 0.000134 M solution of HCl is 3.873.
Explanation:
When HCl dissociates in water then it will give hydrogen and chlorine ions. The reaction will be as follows.
[tex]HCl \rightarrow H^{+} + Cl^{-}[/tex]
This means that 1 mole of HCl is giving 1 mole of hydrogen ions on dissociation.
Hence, pH of the given solution will be calculated as follows.
pH = [tex]-log [H^{+}][/tex]
= [tex]-log (0.000134)[/tex]
= 3.873
Thus, we can conclude that the pH of 0.000134 M solution of HCl is 3.873.
According to the graph, which statement is true?
The atmosphere is composed of only four gases.
Argon and carbon dioxide are represented in equal proportions.
Nitrogen is the most abundant.
Oxygen is the most plentiful gas
Positive ions from a base and negative ions from an acid forma
A 250mL sample of air at STP contains approximately 52.5mL of O2. What is the percentage of oxygen in the air
Answer: 21 percent
Explanation:
Percentage of oxygen in the air is 21%
Percentage based formula:Given that;
Volume of air sample = 250 ml
Volume of O2 in sample = 52.5 ml
Find:
Percentage of oxygen in the air
Computation:
Percentage of oxygen in the air = [Volume of O2 in sample / Volume of air sample] × 100
Percentage of oxygen in the air = [52.5 / 250] × 100
Percentage of oxygen in the air = 21%
Find out more information about 'Percentage'.
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What limits what scientist can study in their work
Answer:
The confounder
Explanation:
A confounder is a quality or variable that affects the results of the study but is not included in the study itself
jermey has two plants. he waters both equally. he puts one plant outside. he puts another plant in a closet
which one is true about the plants?
A. the plant in closet will die.
B. plants only need soil to grow.
c. plants only need water to grow.
d.it does not matter where he puts the plant.
How do the bones protect your organs?
Answer:
Yes
Explanation:
Bones sustain our bodies, and help shape our form. While very thin, the bones are large enough to bear all of our mass. Bones shield the organs of the body too. The skull supports the brain, and creates the face shape.
Which action represents an increase in entropy?
someone arranging a deck of cards in order from aces (low) to kings (high)
green food coloring diffusing through cookie dough
one end of a rod of steel getting warmer while the other end gets cooler
people arranging 80 cans into a pyramid
Answer:
Green food coloring diffusing through cookie dough.
Explanation:
Entropy is a physical quantity for an equilibrium thermodynamic system that measures the degree of organization of the system, or that is the ratio of an increase in internal energy to an increase in temperature of the system.
When the green dye diffuses through the cookie dough there is an increase in entropy, that is, there is an increase in system disorder at the molecular level, where a change in cookie dough occurs.
Answer:
B. green food coloring diffusing through cookie dough
Explanation:
Write the balanced COMPLETE ionic equation for the reaction when KOH and Cu(NO₃)₂ are mixed in aqueous solution. If no reaction occurs, write only NR.
When KOH and Cu(NO3)2 are mixed in aqueous solution, no precipitation occurs as all ions remain solvated, hence the complete ionic equation shows no net change and is written as NR (no reaction).
Explanation:When KOH (potassium hydroxide) and Cu(NO3)2 (copper(II) nitrate) are mixed in aqueous solution, a double displacement reaction occurs. KOH is a strong base and fully dissociates into K+ and OH− ions in water. Cu(NO3)2 is a soluble salt and dissociates into Cu2+ and NO3− ions.
However, no precipitate is formed in this reaction since all the ions remain in solution. Therefore, the complete ionic equation is:
K+(aq) + OH−(aq) + Cu2+(aq) + 2NO3−(aq) → K+(aq) + 2NO3−(aq) + Cu2+(aq) + OH−(aq)
After canceling the spectator ions, we are left with NR (no reaction) since there is no net change in the species present in the solution.
Learn more about Complete Ionic Equation here:https://brainly.com/question/39586178
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Interpret Graphics Which magnetic pole is closest to the geographic North Pole?
Answer:
South Magnetic Pole
As the amount of charge on two objects increases, the strength of the electrical force between the objects
O increases
O decreases.
O varies
O remains the same
Answer:
Increases, since higher the charge concentration higher the electrical force of attraction and repulsion
How is balancing a chemical reaction similar to taking inventory in a store?
Answer:
The both must be balanced and every input must be accounted for at the output.
Explanation:
In taking inventory at the store, one must make sure that the total inventory is always balanced at the end of the inventory log (all stocks taking out must be accounted for in the end) so also is the chemical reaction in which the total reactants species atoms must equal the total product specie atoms.
2.
Which is the best example of an object that converts electric energy to heat energy?
lamp
toaster
radio
Answer:
Toaster
Explanation:
When you put a frozen food *aka waffles* in a toaster, it heats up, melting the ice and coming out crispy and crunchy.
~Jack Pullman
p.s. Mark for Brainiest!
which statement correctly compares chemical reactions with nuclear reactions?
Answer:
B. In chemical reactions, small amounts of energy can be absorbed or released. In nuclear reactions, changes in energy are much larger.
Explanation:
I apologize if this answer is late or doesn't answer your original question, but I answered this question correctly on my quiz :)
I hope others will find this helpful! :D
A molecule of pentane is made of 5 carbon atoms and 12 hydrogen atoms. A collection of pentane molecules has 3.01 x 1024 carbon atoms. How many hydrogen atoms are in
the collection?
A. 3.01 x 1024 x (12/5) hydrogen atoms
B. (3.01 X 1024 / 5) hydrogen atoms
C. 3.01 x 1024 x 12 hydrogen atoms
D. 3.01 x 1024 x (5/12) hydrogen atoms
Answer:
3.01 × 1024 × (12/5) hydrogen atoms
Explanation:
What's the answer to this question?
A- 18.3 degrees
B- 124 degrees
C- 23.5 degrees
D- 50.2 degrees