The Milky Way galaxy (pictured above) is an example of a(n) ____ galaxy. At the center of the galaxy is a galactic bulge that is around 20,000 light years long. In the very center of the galaxy is a massive ____ that is 4 million times the mass of the sun and has a huge gravitational pull.
A. Spiral, Supernova
B. Spiral, Black Hole
C. Elliptical, Supernova
D. Elliptical, Black Hole
Answers
The Milky Way galaxy is an example of a spiral galaxy. This is characterized by a disk with spiral arms, a central bulge, and a dark matter halo. The center of the Milky Way galaxy is a galactic bulge that is around 20,000 light years long.
In the very center of the galaxy, there is a massive black hole that is 4 million times the mass of the sun and has a huge gravitational pull. This massive object, known as a supermassive black hole, is a key feature of many spiral galaxies and is thought to play an important role in the dynamics and evolution of these galaxies.
Related Questions
how many moles of water are required to produce 2.15 mol oxygen gas in this reaction
Answers
If sodium (Na) bonds with chlorine (Cl), which statement is true?
An electron is transferred from sodium to chlorine and an ionic bond is
formed.
An electron is shared between sodium and chlorine and an ionic bond is
formed.
An electron is transferred from sodium to chlorine and a covalent bond is
formed.
An electron is shared between sodium and chlorine and a covalent bond is
formed.
Answers
Answer:
First Statement is correct
Explanation:
An electron is transferred from sodium to chlorine and ionic bond is formed.
Hope it help!!
If sodium ( Na ) bonds with chlorine ( Cl ), then an electron is transferred from sodium to chlorine and an ionic bond is formed. Therefore, option A is correct.
What is ionic bond ?The main interaction taking place in ionic compounds is ionic bonding, a form of chemical bonding that includes the electrostatic attraction between two atoms or ions with dramatically differing electronegativities.
When the ionic character is larger than the covalent character, i.e., when there is a significant difference in the electronegativity between the two atoms, the bond is more polar than when the electrons are divided more evenly in covalent bonding.
The ionic bond found in the salt sodium chloride is an illustration of this type of connection. The valence electron from sodium is transported to chloride's outer electron shell.
Thus, option A is correct.
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Question 4 of 20
A student is performing experiments on a particular substance. Which
statement is an observation of a chemical property of the substance?
A. Its viscosity decreases.
B. It boils.
C. Electricity passes through it.
D. It reacts with acid.
SUBMIT
Answers
Answer:
D
Explanation:
Reacting with acid is the only chemical property out of the 4 options. The rest are physical
Now molecules: Choose... molecules of H 2 + Choose... molecules of O 2 → Choose... molecules of H 2 O
Answers
2 H2 + O2 → 2 H2O
We interpret this as “two molecules of hydrogen react with one molecule of oxygen to make two molecules of water.” The chemical equation is balanced as long as the coefficients are in the ratio 2:1:2. For instance, this chemical equation is also balanced:
100 H2 + 50 O2 → 100 H2O
This equation is not conventional—because convention says that we use the lowest ratio of coefficients—but it is balanced. So is this chemical equation:
5,000 H2 + 2,500 O2 → 5,000 H2O
Again, this is not conventional, but it is still balanced. Suppose we use a much larger number:
12.044 × 1023 H2 + 6.022 × 1023 O2 → 12.044 × 1023 H2O
These coefficients are also in the ratio of 2:1:2. But these numbers are related to the number of things in a mole: the first and last numbers are two times Avogadro’s number, while the second number is Avogadro’s number. That means that the first and last numbers represent 2 mol, while the middle number is just 1 mol. Well, why not just use the number of moles in balancing the chemical equation?
2 H2 + O2 → 2 H2O
Answer:
2 H2 + 1 O2 → 2 H2O
Explanation:
4 points
What is the volume of an object with a density of 5.20 g/cm3 and a mass
of 6.00 x 10^2? g?
Answers
Which of the following examples is a chemical property?
Answers
Answer:
Examples of chemical properties include flammability, toxicity, acidity, reactivity (many types), and heat of combustion. Iron, for example, combines with oxygen in the presence of water to form rust; chromium does not oxidize (Figure 2).
Explanation:
All elements in this series are radioactive
Answers
Answer:
you did not posted the series
Explanation:
PLS HELP ME THIS IS DUE TODAY BRO ILL BRAINLIST U JUST DO THE ONES U KNOW WAJDHWNDIGB!
Answers
Answer: Helium: atomic number 2. EC 2
Neon: atomic number 10. EC 2,8
hydrogen: atomic number 1. EC 1
magnesium: atomic number 12. EC 2,8,2
chlorine: atomic number 17. EC 2,8,7
Aluminum: atomic number 13. EC 2,8,3
Explanation: hope this helped
How much heat is absorbed in the complete reaction of 3.00 grams of SiO2 with excess carbon in the reaction SiO2(g) + 3C(s) → SiC(s) + 2CO(g) ΔH° = 624.7 kJ/mol?
Answers
Answer:
31.24 kJ
Explanation:
SiO₂(g) + 3C(s) → SiC(s) + 2CO(g) ΔH° = 624.7 kJ/molFirst we convert 3.00 grams of SiO₂ to moles, using its molar mass:
3.00 g SiO₂ ÷ 60.08 g/mol = 0.05 molNow we calculate the heat absorbed, using the given ΔH°:
If the complete reaction of 1 mol of SiO₂ absorbs 624.7 kJ, then with 0.05 mol:
0.05 mol * 624.7 kJ/mol = 31.24 kJ of heat would be absorbed.The heat absorbed by 3.00 grams of SiO2 is 31.17 kJ/mol.
The thermochemical equation is;
SiO2(g) + 3C(s) → SiC(s) + 2CO(g) ΔH° = 624.7 kJ/mol
The number of moles of SiO2 = 3.00 g/60.08 g/mol = 0.0499 moles
From the reaction equation;
1 mole of SiO2 absorbs 624.7 kJ/mol
0.0499 moles SiO2 absorbs 0.0499 moles × 624.7 kJ/mol/1 mole
= 31.17 kJ/mol
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hey guys i dont want to beg for help but i just am stuck in this q please help
Answers
I try this before but for me is letter C
Answer:
C
Explanation:
i took the test
9. This type of bond consists of closely packed cations and loosely held valence e- rather than
neutral atoms.
a. lonic
b. Covalent
c. Metallic
d. polyatomic
Answers
Explain why the metals conduct electricity
write in your own words please, don't copy-paste from internet
Answers
Answer:
Metals conduct electricity because the electrons inside the metal are relatively free to move. So when electricity is pass through metals, electrons carry electricity and spread it all over the metal. The mobility of electrons is the reason why metals conduct electricity.
The purpose of mitosis is to produce
A. Sex cells
B. Body cells
C. DNA
Answers
Sorry I need to ask question
can someone please explain this i will give brainliest
Answers
2) 2
3) there are 2 atoms of hydrogen and 1 atom of oxygen, altogether is 3
4) subscript tells how many atoms of each element are present in the molecule
5) No, it is not balanced because the oxygen atom is not equal on both sides of the reactants and products. This wouldn’t be considered balanced as there are two oxygen atoms in the reactants section and only one oxygen on the products section.
It is:
2 H2 + O2 -> 2 H2O
he distance from Earth to the North Star is about 430 light-years. Which of the following statements describes why scientists use the light-year unit to measure distances in space?
A light-year unit is very small and distances in space are very small.
A light-year unit is very small and distances in space are very large.
A light-year unit is very large and distances in space are very small.
A light-year unit is very large and distances in space are very large.
Answers
Answer:
D
Explanation:
because the rest don’t make any sense
A light-year unit is very large and distances in space are very large. Therefore, the correct option is option D.
What is distance?No matter the direction of the journey, distance is the overall path that an item in motion has traveled. Since just the length of the path travelled is calculated as well as the motion's direction is ignored, distance is referred to as a scalar number. The distance can only ever be positive; it can never be 0 or negative.
Displacement generally defined as the overall alteration of an object's location and motion direction. Displacement is recognized as a vector quantity since it takes into consideration both the directions of the motion and the amount of the changing position. Displacement may be zero, positive, or negative. A light-year unit is very large and distances in space are very large.
Therefore, the correct option is option D.
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Is barium hydroxide Ba(OH)2 or is BaOH?
Answers
Answer:
What is the charge on the barium ion and what is the charge of the hydroxide ion.
Explanation:
To get the correct formula they have to add to zero over all.
empirical formula of c8h14
Answers
Answer:
C4H7
Explanation:
Empirical formula is defined as the simplest ratios of atoms present in the compound.
The empirical formula for C8H14 is C4H7 as if you multiply each coefficient of C4H7 by 2, it will become C8H14. The chemical name of C8H14 or C4H7 is 1-Methylcycloheptene.
Hence, the correct answer is "C4H7".
Do you think personality
traits are primarily inherited
from your parents or
influenced by the
environment? What is your
evidence you researched?
Answers
Personality traits are influenced by a combination of genetic and environmental factors. Research suggests that both genetics and the environment play significant roles in shaping an individual's personality.
Studies on twins and adoption give proof that genetics affect personality. When opposed to fraternal twins, who only share 50% of their genetic makeup, identical twins, who share 100% of their genetic material, frequently show stronger similarities in personality traits. This shows that certain personality traits are influenced by hereditary factors.
Yet, environmental influences also have a considerable impact on personality. Despite having comparable DNA, studies on non-twin siblings reared in the same home have found that they frequently display personality differences.
This shows that the environment, including parental practices, cultural influences, and life events, has a significant impact on personality development.
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Does anybody know how to find the theoretical yield? you can just do 1 equation
Answers
Answer:
its the first part in mass of sodium
Explanation:
:)
You're leaving a carnival and you're pumped because a clown just handed you a red, helium- filled balloon. But then, something tragic occurs. You hear the ice cream truck, jump with joy doing a 180 degrees in the air, and you lose grip of your beautiful balloon. Upward it flies as you stare speechless into the sky. Why did this helium balloon fly away instead of falling to the ground like a balloon filled with your breath usually does?
Answers
The balloon from our breath contains carbon dioxide which is heavier than air so it doesn’t rise
In the formula XS04, the symbol X could represent the element*
O (1) AI
O (2) Ar
O (3) Mg
0 (4) Na
Answers
When talking about the products of photosynthesis, why is it a HUGE issue when a vast amount of the rainforests is dying along with vast acres of forests from fires/deforestation? Remember, we know that this hurts the ecosystems of animals living there, but what else does it effect? Question 5 options: the creation of too much water the creation of oxygen the creation of to much heat the creation of carbon monoxide
Answers
Answer:d
Explanation:because im really really sure thats the answer
Which group (family) of non-metals does not form ions?
Answers
Answer:
Noble gasses
Explanation:
nobled gasses
all elements want to loose or gain electrons to be like the noble gasses in bonding but the noble gasses do not bond.
C6H12O6 O3 NF3 Co KNO3 H2 CO
Which one of these are molecules list all that apply
Answers
Why doesn't the Earth usually feel solar winds?
A. because of the aurora borealis
B. because of its strong magnetic field
C. because of strong magnetic activity inside the Sun
D. because they contain electromagnetic radiation
Answers
the magnetosphere deflects most of the charged particles and shields our planet's surface
iron (ii) hydroxide + sodium nitrate. Name the precipitate formed in reaction
Answers
Determina la densidad de una barra dd hierro cuya masa ed de 160gr y su volumen es de 20,35cm³ ¿que volumen ocuparan 12g de hierro?
Answers
Answer:
15.26 cm³
Explanation:
La densidad de una sustancia se define como su masa por unidad de volumen:
densidad = masa/volumen
Tenemos los siguientes datos de la barra de hierro:
masa = 160 g
volumen = 20,35 cm³
Por lo tanto, la densidad de la barra de hierro es:
densidad = 160 g/20,35 cm³ = 0.786 g/cm³
El volumen de 12 gramos de hierro se calcula utilizando el dato de masa (12 g) y la densidad calculada:
densidad = masa/volumen ⇒ volumen = masa/densidad
= 12 g/(0.786 g/cm³)
= 15.26 cm³
DUE IN 10 MINUTES I WILL MAKE YOU BRAINILIST
Answers
Answer:
Ernest Rutherford postulated the nuclear structure of the atom, discovered alpha and beta rays, and proposed the laws of radioactive decay. He received the Nobel Prize in Chemistry in 1908.
Erwin Schrödinger proposed the quantum mechanical model of the atom, which treats electrons as matter waves. ... The Heisenberg uncertainty principle states that we can't know both the energy and position of an electron.
hope it helps
At sea level, a kilogram welghs approximately
2 pounds
10 pounds
5 pounds
1 pound
Answers
Answer:
1 kilogram weight at sea level would be the equivalent of 2 pounds.
Explanation:
What is the momentum of a car with a mass of 1,300 kg traveling north at a speed of 28 m/s?
Answers
Answer:
p = 36400 kg·m/s
Explanation:
p=mv
p= Momentum
m= mass (1300 kg)
v= 28
1300 × 28
= 36400 kg·m/s
The Momentum of the car is 36400 kg-m/s.
What is Momentum ?Momentum is the product of the mass and velocity of an object. It is a vector quantity, possessing a magnitude and a direction. m is an object's mass and v is its velocity
Given that,
Mass of the car, m = 1300 kgSpeed of the car, v = 28 m/s (towards north)(m is an object's mass and v is its velocity)
To find :
The momentum of car, p
Solve :
Let p is the momentum of an object. It can be calculated by the product of mass and its velocity. The formula to find it is given by :
p = m x v
= 1300 x 28
= 36400 kg-m/s.
Therefore, the momentum of the car is 36400 kg-m/s.
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