!!!!100 POINTS!!!!


Select a time span from the list below.

1500 - 1600

1600 - 1700

1800 - 1900

1920 - 1940

1950 - 1970

1970 - 1990

1990 - present

Research astronomy during that time and create a timeline of important events. You may use several materials to create your timeline, including a roll of paper, construction paper, or the computer. Be sure your timeline is accurate, legible, and visually appealing. Choose the event you believe had the greatest impact and write a 150 word summary supporting your opinion. Upload your timeline and summary in the box below. Astronomy Timeline

The orbital in 1s has no nodes. One node makes up the 2p orbital. Two nodes make up the third orbital. The 4f orbital also contains three nodes.

The sum of the radial nodes (n-l-1) and the angular nodes (l) is equal to (n-1). Here, the letters "l" and "n" stand for the azimuthal and primary quantum numbers, respectively. The form of an orbital is described by its azimuthal quantum number, also known as orbital angular momentum. Its value is equal to the total number of angular nodes in the orbital, and it is represented by the letter "l."

So, for 1s orbital, the total number of nodes is equal to (1-1)=0.

Total number of nodes for 2p orbitals is (2-1)=1.

For 3d orbitals total no. of nodes= (3-1)=2

And for 4f orbitals no. of nodes =(4-1)=3

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Answer:

f

Explanation:

(A) R_r represents the rate of change of resistance with respect to the radius of the artery, r. The units of R_r are mmHg/mm. A negative value for R_r indicates that an increase in the radius of the artery will result in a decrease in resistance, meaning it becomes easier for blood to flow through the wider artery.

(b) The derivative is zero because the resistance with respect to the radius does not depend on the length of the artery.

(a) To calculate R_L (L, r), we differentiate the equation with respect to L while keeping r constant:

\(R_L(L, r) = d/dL (kL/r^4) = k/r^4\)

R_L represents the rate of change of resistance with respect to the length of the artery, L. The units of R_L are mmHg/cm. A positive value for R_L indicates that an increase in the length of the artery will result in an increase in resistance, meaning it becomes harder for blood to flow through the longer artery.

To calculate R_r (L, r), we differentiate the equation with respect to r while keeping L constant:

\(R_r(L, r) = d/dr (kL/r^4) = -4kL/r^5\)

R_r represents the rate of change of resistance with respect to the radius of the artery, r. The units of R_r are mmHg/mm. A negative value for R_r indicates that an increase in the radius of the artery will result in a decrease in resistance, meaning it becomes easier for blood to flow through the wider artery.

(b) To calculate R_rr (L, r), we differentiate R_r (L, r) with respect to r while keeping L constant:

\(R_rr(L, r) = d/dr (-4kL/r^5) = 20kL/r^6\)

R_rr represents the rate of change of R_r with respect to r. The units of R_rr are mmHg/mm^2. A positive value for R_rr indicates that as the radius of the artery increases, the rate of decrease in resistance increases. In other words, the wider the artery becomes, the easier it is for blood to flow through.

To calculate R_rL (L, r), we differentiate R_r (L, r) with respect to L while keeping r constant:

\(R_rL(L, r) = d/dL (-4kL/r^5) = 0\)

R_rL represents the rate of change of R_r with respect to L. The units of R_rL are mmHg/(cm·mm). The derivative is zero because the resistance with respect to the radius does not depend on the length of the artery. This implies that changes in the length of the artery do not affect the rate of change of resistance with respect to the radius.

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Our current understanding of the atom is based on Dalton's early 19th-century idea of atomism, which was developed from meteorological investigations. John Dalton was just a meteorologist, an expert on color blindness, and a teacher, but he will be most widely recognized for creating the idea of atomism.

A scientist is someone who meticulously gathers data and uses it to develop theories, test those hypotheses, and further knowledge and understanding. Despite the fact that the name "scientist" predates Aristotle by more than two millennia, he is frequently referred to as the first scientist. He invented the methods of reasoning, observation, inquiry, and demonstration in Greece in the fourth century BC.

Because they provide specialized explanations for how the world functions, scientists play a crucial role in society. Science is a powerful tool for survival, despite the fact that it doesn't always provide us with joy, and humans have spent considerable time starting to figure out how to do both.

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Answer

A) The concentration of nutrients decreases, which improves the water quality in the pond.

Explanation

Dilution is a way to decrease pollution, in this case, freshwater will contain a low amount of nutrients, dissolving those present in the pond and reducing the overall concentration. Fewer nutrients derive in less eutrophication and hence better water quality.

Option - C : Steam is the physical states of water contains particles with the highest kinetic energy. Because water in a gaseous form, has its particles moving around the most. Therefore, having the highest kinetic energy .

Kinetic energy is the energy that a moving item possesses. An item can only be accelerated through the application of a force. Applying force requires effort on our part. Following completion of the work, energy is transferred to the object, which then moves at a new, constant speed. Kinetic energy is the force that drives motion, and it may be observed in the motion of objects and subatomic particles. Every particle and moving object contains kinetic energy. Walking, a baseball flying through the air, food falling from a table, and a charged particle in an electric field are some examples of kinetic energy in action. The power is the energy , an object in motion possesses.

The word "kinetic" derives from the Greek "kinesis," which means motion.

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According to the Gay-Lussac's law, as the container is heated that is as temperature increases pressure also increases as they are directly proportional to each other.

Gay-Lussac's law is defined as a gas law which states that the pressure which is exerted by the gas directly varies with its temperature and at a constant volume.The law was proposed by Joseph Gay-Lussac in the year 1808.

The pressure of the gas at constant volume reduces constantly as it is cooled till it undergoes condensation .The nature of  graph of pressure versus temperature is linear.

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Answer:

1: exothermic

2:hydrated iron (III) oxide

3:reactants

4:precipitate

5: hydrogen gas

Answer:1.exothermic

2.hydrated iron (III) oxide

3.reactants

4.precipitate

5. hydrogen gas

The molarity of NaOH solution is 0.114 M.

Given, Mass of flask and vinegar solution= 25.17 g.Mass of flask= 15.12 gVolume of vinegar solution (in mL)= 10.00 mlInitial volume of NaOH (in mL)= 0.00 mlFinal volume of NaOH (in mL)= 39.00 mlThe Mass of vinegar solution is 10.0503 g.The volume of NaOH used in titration is 39.00 ml.Let's calculate the molarity of the NaOH solution.First, calculate the moles of NaOH used in the reaction. Moles of NaOH = Molarity × Volume of NaOH (in L) Converting volume in mL to L,Volume of NaOH used = 39.00 mL = 39.00/1000 L = 0.0390 LThe molarity of NaOH solution is given by;Molarity of NaOH = Moles of NaOH / Volume of vinegar solution (in L)Converting volume in mL to L,Volume of vinegar solution = 10.00 mL = 10.00/1000 L = 0.0100 LNow, substituting the values; Molarity of NaOH = 0.114 M.

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Answer:

evaporation and condesation

Explanation:

because he was curiuos

Answer:

Carbon and oxygen combine to form two oxides, carbon monoxide and carbon dioxide in which the ratio of the weights of carbon and oxygen is respectively 12:16 and 12:32.

The solubility of a compound in a particular solvent depends on several factors, including the polarity of the solvent and the solute. Nonane is a nonpolar solvent, which means that it cannot dissolve polar compounds effectively. In general, compounds with nonpolar properties are more soluble in nonane compared to polar compounds.

1-pentanol, ethanol and acetic acid are polar compounds because they contain a hydroxyl group (-OH) or carbonyl group (C=O) that makes them more soluble in polar solvents such as water. Benzene and ethyl methyl ketone are nonpolar compounds because they lack any polar functional groups and contain only carbon and hydrogen atoms.
Based on their polarities, we can predict that benzene and ethyl methyl ketone will be the most soluble in nonane because nonane is a nonpolar solvent. The polar compounds (1-pentanol, ethanol, and acetic acid) will not dissolve well in nonane due to their polarity. Acetic acid may have some solubility in nonane because it has a relatively small polar functional group and a large nonpolar hydrocarbon chain. In conclusion, the most soluble compound in nonane is likely to be benzene or ethyl methyl ketone, both of which are nonpolar. The polar compounds are not expected to be very soluble in nonane due to the nonpolar nature of the solvent.

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Answer:ASEXUAL: Single parent, Genetically identical, Replication,Budding, splitting /  splicing and plant cutting propogation  SEXUAL: Two parents, genetically unique, Humans and Cows

Explanationasexual is one parent or stays the same, sexual is where two combine

This net ionic equation, including phases, represents the reaction of Fe(NO₃)₂(aq) and Na₂CO₃(aq) to form FeCO₃(s) and 2NaNO₃(aq).

The net ionic equation, including phases, for the reaction:
Fe(NO₃)₂(aq) + Na₂CO₃(aq) ⇒ FeCO₃(s) + 2NaNO₃(aq)
First, we break down the reactants and products into their respective ions:
Fe²⁺(aq) + 2NO₃⁻(aq) + 2Na⁺(aq) + CO₃²⁻(aq) ⇒ FeCO₃(s) + 2Na⁺(aq) + 2NO₃⁻(aq)
Now, we can remove the spectator ions that do not participate in the reaction, which are 2Na⁺(aq) and 2NO₃⁻(aq). This gives us the net ionic equation:
Fe²⁺(aq) + CO₃²⁻(aq) ⇒ FeCO₃(s)

The entire symbols of the reactants and products, as well as the states of matter under the conditions under which the reaction is occurring, are written in the complete equation of a chemical reaction.

Only those chemical species that actively contribute to a chemical reaction are listed in the net ionic equation for that reaction. In the net ion equation, mass and charge must be equal.

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The balanced half-reactions are given below:

A. Mo³⁺ (aq) + 3e⁻ → Mo(s)

B. H₂SO₃ (aq) +  H₂O → SO₄⁻ (aq) + 4 H⁺ + e⁻

C. NO₃⁻ (aq) + 4 H⁺ + 2e⁻ → NO (g) + 2 H₂O

D. O₂ (g) + 4H⁺ +  4 e⁻ → 2 H₂O (l)

Half-reactions refers to either of the two reactions in a redox reaction.

A redox reaction is a reaction in which oxidation and reduction occur simultaneously and to the same extent.

Oxidation reaction involves a loss of electrons while reduction reaction involves a gain of electrons.

The balanced half-reactions are given below:

A. Mo³⁺ (aq) → Mo(s) ( in acidic solution)

This is a reduction reaction:

Mo³⁺ (aq) + 3e⁻ → Mo(s)

B. H₂SO₃ (aq) → SO₄⁻ (aq) (acidic solution)

This is an oxidation reaction

H₂SO₃ (aq) +  H₂O → SO₄⁻ (aq) + 4 H⁺ + e⁻

C. NO₃⁻ (aq) → NO (g) (acidic solution)

This is a reduction reaction

NO₃⁻ (aq) + 4 H⁺ + 2e⁻ → NO (g) + 2 H₂O

D. O₂ (g) → H₂O (l) (acidic solution

This is a reduction reaction

O₂ (g) + 4H⁺ +  4 e⁻ → 2 H₂O (l)

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While many elemental spectral lines are visible, almost all molecular lines lie in the __infrared___ portion of the spectrum, since they are at much lower energy.

What are spectral lines ?

A spectral line is a dim or shining line in a spectrum that is otherwise uniform and continuous, caused by an excess or shortage of photons in a specific frequency range in comparison to frequencies closer to it.

Infrared waves, or infrared light, are part of the electromagnetic spectrum. People encounter Infrared waves every day; the human eye cannot see it, but humans can detect it as heat. A remote control uses light waves just beyond the visible spectrum of light—infrared light waves

Therefore, infrared portion of the spectrum is the part where molecular lines lie.

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Answer:

noc

Explanation:

xd

Answer:

It is possible to fill a balloon with a mixture of hydrogen and oxygen and find that ... the following equation is balanced because the total mass of the reactants is ... of hydrogen and one mole of oxygen is equal to the mass of two moles of water.

Explanation:

ig this can be Explanation:

and the answer:)

Answer:

Electrolytes, particularly sodium, help the body maintain normal fluid levels in the fluid compartments because the amount of fluid a compartment contains depends on the amount (concentration) of electrolytes in it. If the electrolyte concentration is high, fluid moves into that compartment (a process called osmosis).

Explanation:

Answer:

Electrolytes are minerals in your body that have an electric charge. They are in your blood, urine, tissues, and other body fluids. Electrolytes are important because they help

Balance the amount of water in your body

Balance your body's acid/base (pH) level

Move nutrients into your cells

Move wastes out of your cells

Make sure that your nerves, muscles, the heart, and the brain work the way they should

Sodium, calcium, potassium, chloride, phosphate, and magnesium are all electrolytes. You get them from the foods you eat and the fluids you drink.

The levels of electrolytes in your body can become too low or too high. This can happen when the amount of water in your body changes. The amount of water that you take in should equal the amount you lose. If something upsets this balance, you may have too little water (dehydration) or too much water (overhydration). Some medicines, vomiting, diarrhea, sweating, and liver or kidney problems can all upset your water balance.

Treatment helps you to manage the imbalance. It also involves identifying and treating what caused the imbalance.

The empirical formula for pyrite is FeS2.

HOW TO CALCULATE EMPIRICAL FORMULA:

46.5 mass % Fe = 46.5g of Fe

53.5 mass % S = 53.5g of S

Fe = 46.5g ÷ 56g/mol = 0.83mol

S = 53.5g ÷ 32g/mol = 1.67mol

Fe = 0.83mol ÷ 0.83 = 1

S = 1.67mol ÷ 0.83 = 2.014

Approximately, the ratio of Fe to S is 1:2. Therefore, the empirical formula of pyrite is FeS2.

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Answer: oh i thought i knew it nvm im sorry love

Explanation:

A, the total number of valence electron is 24 for Silicon Tetrachloride , SiCl₄ .

In Lewis Dot structure S=N-A is used to calculate the total number of shared and unshared electrons in a molecule.

S is the number of shared electrons ,N is the number of total valence shell electrons required by all the atom of the molecule, A is the total number of valence electrons available from all the atoms in the molecule

For SiCl₄,

• We have to first count the valence electron on each atom that is coming to form a molecule .

Valence electron on Si = 4

Valence Electron on Cl = 7

Total valence electron on SiCl₄ = 4+ 4 * 7 = 32

• Then we find the least electronegative atom in the molecule and place it at the center , In SiCl₄ , Si has 1.8 and Cl has 3.16 and so Si is placed at the center and four Cl atoms are connected with a single bond

• A single bond takes up 2 valence electron and so for four bonds 8 valence electrons have been occupied , so we are left with 32-8=24 valence electrons.

Therefore In the Lewis Dot structure S=N-A , Total number of valence electrons available from all the atoms in molecule of SiCl₄ is 24.

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The products being more stable than the reactants is the factor which would reduce the yield of a reaction and is denoted as option B under standard conditions.

This is the process in which one or more substances which are referred to as reactants are converted into new substances which we call the products.

A chemical reaction involves atoms exhibiting different bond formation so as to ensure they acquire an octet configuration and promotes proper stability of the products.

When the products are more stable than the reactants it means it is unable to form other products thereby decreasing the yield which is why it was chosen as the most appropriate choice.

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Answer:

Osmosis is the process that describes water moving through a membrane.

I am not sure about the second question.

Explanation:

If the world energy consumption of 500 Quads per year were entirely supplied by the estimated 6000 Quads of natural gas reserves, it would last for approximately 12 years.

To determine this, we divide the total estimated reserves of 6000 Quads by the annual energy consumption of 500 Quads. The result gives us the number of years the reserves would last if they were fully utilized to meet the energy demand.

Given that the world energy consumption is 500 Quads per year and the estimated natural gas reserves are 6000 Quads, we divide the total reserves by the annual consumption:

Years = (Estimated reserves) / (Annual consumption)

Years = 6000 Quads / 500 Quads per year

Years ≈ 12 years

Therefore, if all of the world's energy consumption were supplied by the estimated natural gas reserves, it would last for approximately 12 years.

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Answer:

potassium

Explanation:

Question 4 : Listen Based on what you know about mineral groups, which mineral is most susceptible to dissolution from acids?

Answer 4 : (d) calcite.

Question 5: Based on what you learned about minerals in the past, quartz is the most susceptible mineral to oxidation. Answer 5 : (b) quartz.

Question 6: During dissolution, the ionic bonds between Na and Cl ions are broken in salt.

Answer 6 : (b) the ionic bonds between them are broken.

Question 7: Felsic is the igneous composition type that is most susceptible to chemical weathering.

Answer 7 : (d) felsic.

Question 12: True. More surface area exposure typically leads to more rapid chemical weathering.

Answer 12 : (a) True.

Question 13: Quartz is the mineral that is least likely to be weathered on Bowen's reaction series.

Answer 13 : (a) quartz.

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Answer:

C. A chemical reaction.

Explanation:

A chemical reaction can be defined as a chemical process which typically involves the transformation or rearrangement of the atomic, ionic or molecular structure of an element through the breakdown and formation of chemical bonds to produce a new compound or substance.

Since the Statue of Liberty is made out of copper and was once shiny and copper-colored. Over the years, the copper has gone through a process called oxidation, where it has changed into a new material. Thus, this is a chemical reaction.

In this case, occurred a CHEMICAL REACTION known as oxidation.

A chemical reaction is a process where one or more substances called reactants can react to be converted into one or more products.

In conclusion, in this case, occurred a CHEMICAL REACTION known as oxidation.

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Answer:

8.92 m/s

Explanation:

Distance covered = 107 m

Time = 12 s

Average speed = ?

The relationship between the parameters is given by;

Average speed = Distance covered / Time

Average speed = 107 / 12

Average speed = 8.92 m/s

pH = -log[H3O+] = -log(8.26 x 10^-5) = 4.083 (three decimal places because the concentration had three sig figs)

Immunizations are the best way to protect yourself and your family from illnesses.

Immunizations, or vaccines, are one of the most important public health tools available to protect people from serious and potentially deadly diseases. Vaccines work by introducing a small, weakened form of a virus or bacteria into the body. This triggers the body’s immune system to respond and create antibodies, which provide immunity to the disease when the body is exposed to it. Immunization protects not only the person who is vaccinated, but also their family, friends, and community. It can also help prevent the spread of disease to other countries.It is important to stay up to date on immunizations, as recommended by the Centers for Disease Control and Prevention (CDC).

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