Help me please !!!
Which of the following can be inferred from the diagram above that shows the dependence of potential Energy on the Internuclear distance between two atoms?

A)The atoms form a bond with a bond length of 25 pm
B)The atoms form a bond with a bond length of 75 pm
с)The net force between the atoms is attractive at 25 pm
D)The net force between the atoms is attractive at 75 pm

If Earth revolved at a faster rate, what would most likely be daylight hours would decrease. Therefore, option B is correct.

Earth's rotation can be described as the rotation of planet Earth around its own axis and changes in the orientation of the rotation axis in space. Earth rotates once in 24 hours around Sun, but once in 23 hours, 56 minutes, and 4 seconds w.r.t. other distant stars.

Earth's rotation can be slowed slightly with time therefore daylight was shorter in the past due to the tidal effects the Moon has on Earth's rotation.

The earth's spinning on its axis causes days to turn into nights. The rise and fall of tided effect on the Direction of the Wind, Cyclones, Ocean currents, and change of day and night.

If the earth's rotation becomes faster it will complete one spin in less than 24 hours therefore, the daylight hours would decrease.

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Answer:

Chloroform has a boiling point of 61.15 degrees Celsius and a vapor pressure of 9.5 kPa at 20 degrees Celsius. Glycerol, on the other hand, has a boiling point of 290 degrees Celsius and a vapor pressure of 0.0002 kPa at 20 degrees Celsius. Therefore, chloroform has a much lower boiling point and a much higher vapor pressure than glycerol. This means that chloroform is more volatile and evaporates more easily than glycerol.

Explanation:

Chloroform has a boiling point of 61.15 degrees Celsius and a vapor pressure of 9.5 kPa at 20 degrees Celsius. Glycerol, on the other hand, has a boiling point of 290 degrees Celsius and a vapor pressure of 0.0002 kPa at 20 degrees Celsius. Therefore, chloroform has a much lower boiling point and a much higher vapor pressure than glycerol. This means that chloroform is more volatile and evaporates more easily than glycerol.

A potassium atom's ground state electron configuration is 1s2, 2s2, 2p6, 3s2, 3p6, 4s1.

An atom's electron configuration is a picture of how electrons are arranged in relation to orbital shells and subshells. Consequently, this is potassium's electron configuration.

Making Electron Configurations in Writing. Write the energy level (the period) first, then the subshell that needs to be filled, and finally the superscript, which indicates how many electrons are in that subshell. The atomic number, Z, is the sum of all the electrons.

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The statement oxygen is negative and hydrogen is positive is true.

Charge on an element is determined by the position of an element in the periodic table.More precisely,it is determined by an element's electronic configuration.

Elements having one electron in their outermost or valence shell are  situated to the left of the periodic table and are positive as they  loose their one electron present in valence shell to form cations that are positively charged ions.

Elements having six or seven electrons in their valence shell tend to gain one or two electrons respectively to complete their octet.These elements form anions that are negatively charged ions.

Hydrogen with atomic number 1 has 1 electron in it's valence shell which it looses to acquire a positive charge and hence form a cation .

Oxygen on the other hand,with atomic number 8 has 6 electrons in it's valence shell and thus gains 2 more electrons to complete the octet,and hence gain a negative charge and form an anion.

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Answer:

The following are the four unusual characteristics of water due to hydrogen bonding:  

1. Water exhibits high specific heat as the presence of hydrogen bonds enhances the concentration of energy needed for the molecules to accelerate the speed, thus, elevating the specific heat.  

2. Water has both high melting and high boiling points as hydrogen bonds enhance the energy, which is needed at the time of phase change, thus, increasing both the melting and the boiling points.  

3. The hydrogen bonds present in the water gives rise to robust intermolecular attractions, therefore, enhancing the surface tension.  

4. The hydrogen bonds present in the water makes the water to exhibit high heat of vaporization, that is, of about 41 KJ/mol.  

Answer:

High boiling and melting points: Hydrogen bonds increase the amount of energy required for phase changes to occur, thereby raising the boiling and melting points.

High specific heat: Hydrogen bonds increase the amount of energy required for molecules to increase in speed, thereby raising the specific heat.

Lower density as a solid than as a liquid: Hydrogen bonds increase the volume of the solid by holding molecules apart, thereby decreasing the density.

High surface tension: Hydrogen bonds produce strong intermolecular  attractions, which increase surface tension.

The statement you provided is plausible. It is widely accepted among the scientific community that the average global temperature has been increasing since the late 1800s, a phenomenon commonly referred to as global warming or climate change.

This increase in temperature is primarily attributed to human activities, such as the burning of fossil fuels and deforestation, which release greenhouse gases into the atmosphere and contribute to the greenhouse effect. As for the response of organisms, including animals, to changes in ambient temperature, it is well-known that many species can exhibit various behavioral and physiological adaptations. This can include changes in their activity patterns, migration patterns, breeding seasons, and feeding behaviors. If the study you mentioned found that the time of day when certain organisms, specifically Academy (I assume you meant "anemone") catching, has changed in response to the changing ambient temperature, it suggests that these organisms have adjusted their behavior to adapt to the shifting environmental conditions. For example, they might be altering their feeding habits to coincide with different temperature patterns or taking advantage of favorable conditions during certain times of the day.

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Answer:

A. can travel through empty space

Explanation:

it is said dat electro magnetic waves or radiation travels through the vacuum of space

Answer:

all of the above. Because, Y'know, electromagnetic radiation is like that.

The mass of a substance is the product of its density and volume. Thus, the   mass of the dissolved solids with a density of 125 mg/dm³ with a volume of 250 cm³ is 31.25 mg.

Density of a substance is the measure of its mass per unit volume. Thus it describes how much denser the substance is in a given volume. Mathematically it is the ratio of mass to the volume.

Density of a substance depends on the mass, volume, bond type, temperature and pressure. The ratio of density of a substance with the density of water is called its specific gravity.

It is given that the density of the dissolved solids is 125 mg/dm³ and the volume is 250 cm³ or 0.25  dm³. Thus the mass can be calculated as follows:

density = mass/volume

 mass   = density × volume

             = 0.25  dm³  ×  125 mg/dm³

             = 31.25 mg

Hence, the mass of the dissolved solids in the river wayer is 31.25 M=mg.

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Explanation:

We have to balance the following equation:

__ H₂O + __ F₂ -------> __ HF + __ O₂

First we have to determine the number of atoms of each element that we have on both sides of the equation.

__ H₂O + __ F₂ -------> __ HF + __ O₂

O: 1 O: 2

H: 2 H: 1

F: 2 F: 1

We have 2 atoms of O on the right side and 1 atom of O on the left side. To balance the O atoms we can change the coefficient for H₂O and write a 2 in front of it.

2 H₂O + __ F₂ -------> __ HF + __ O₂

O: 2 O: 2

H: 4 H: 1

F: 2 F: 1

Then we have 4 atoms of H on the left and 1 atom of H on the right side of the equation. We can change the coefficient for HF to balance the H atoms.

2 H₂O + __ F₂ -------> 4 HF + __ O₂

O: 2 O: 2

H: 4 H: 4

F: 2 F: 4

And finally we have 2 atoms of F on the left and 4 atoms of F on the right. We can change the coefficient for F₂ and write a 2 there.

2 H₂O + 2 F₂ -------> 4 HF + __ O₂

O: 2 O: 2

H: 4 H: 4

F: 4 F: 4

The equation is balanced.

Answer: 2 H₂O + 2 F₂ -------> 4 HF + O₂

A photosynthetic reaction is the formation of the glucose and oxygen molecule by water and carbon dioxide. 12 moles of water will be used in the reaction.

Moles are the ratio of the mass of the substance to the molar mass of the substance.

In the photosynthetic reaction, 6 moles of carbon dioxide and 6 moles of water are utilized to produce 1 mole of a glucose molecule and 6 moles of oxygen.

From this, it can be said that the number of moles consumed of carbon dioxide and water will be equal and in the ratio of 1:1.

The number of moles of carbon dioxide will be equal to that of the water molecule and will also be equal to the ratio of the mass of carbon dioxide to the molar mass of carbon dioxide.

The moles of water will be calculated as:

\(\begin{aligned}\rm moles &= \rm \dfrac{\text{mass of CO}_{2}}{\text{molar mass of CO}_{2}}\\\\&= \dfrac{528}{44.01}\\\\&= 12\;\rm moles\end{aligned}\)

Therefore, option A. 12 moles of water will be used.

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When Co(OH)₃ reacts with H₂SO₄, the reaction produces H⁺ ions and OH-⁻ions as spectator ions.  

When a reaction between sodium silicate and copper(II) nitrite is balanced correctly, the stoichiometric coefficient for sodium nitrite is 2.

This means that for every 2 molecules of sodium silicate that react, 1 molecule of sodium nitrite is produced. The balanced equation for the reaction is: 2Na₂SiO₃ + Cu(NO₂)₂ → 2NaNO₂ + CuSiO₃. In this equation, 2 moles of sodium silicate are reacted with 1 mole of copper(II) nitrite to produce 2 moles of sodium nitrite and 1 mole of copper silicate.

This equation is an example of a redox reaction, where the oxidation number of the copper (from +2 to 0) and the oxidation number of the nitrogen (from +4 to +2) are both changed. The reaction also produces water and heat, as can be seen from the equation.

Therefore, correct option is B in both questions.

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Answer:

hope this short and sweet answer helps

a liquid needs a container but solid doesn't

Explanation:

Solids have definite shapes, and liquids fill their containers.

Solids particles do not expand to fill their containers, and liquid particles do.

Solids particles expand to fill their containers, and liquid particles do not.

Answer: Solids have definite shapes and liquid fill their containers

Explanation:

Solids particles do not expand to fill their containers, and liquid particles do. Solids particles expand to fill their containers, and liquid particles do not.

The atomic mass of lithium-6 is 6.01512 g/mol. The atomic mass of lithium-6 can be calculated by adding the number of protons and neutrons in the nucleus.

However, the actual mass of the nucleus is slightly less than the sum of the individual masses of the protons and neutrons due to the phenomenon known as mass defect.

The mass defect for a lithium-6 nucleus is given as −0.03434 g/mol. This means that the actual mass of the lithium-6 nucleus is 0.03434 g/mol less than the sum of the individual masses of the protons and neutrons.

To calculate the atomic mass of lithium-6, we need to add the actual mass of the nucleus to the mass of one electron (since the atomic mass of an element is the weighted average of the masses of its isotopes, taking into account their relative abundances). The mass of one electron is 0.00054858 g/mol.

So, the atomic mass of lithium-6 can be calculated as follows:

Atomic mass of lithium-6 = (3 protons x 1.00728 g/mol per proton) + (3 neutrons x 1.00867 g/mol per neutron) - 0.03434 g/mol + 0.00054858 g/mol
= 6.01512 g/mol

Therefore, the atomic mass of lithium-6 is 6.01512 g/mol.

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The two main postulates that was given by Antoine Lavoisier are, oxygen play an important role in combustion and the other is mass of the reactant and product is conserved. Therefore the mass of PbCl\(_2\) is 19.6g.

According to Law of conservation of mass, mass can neither be created nor be destroyed. Mass can only be transformed from one form to another. The law of conservation of mass was given by Antoine Lavoisier. Every reaction in nature follow the law given by Antoine Lavoisier that is mass is always conserved.

NaCl + Pb (NO\(_3\)) \(_2\)(aq)  → PbCl\(_2\) (s) ↓  + 2 NaNO\(_3\) (aq)

Mass of NaCl =15.90 Grams

Mass of  Pb (NO\(_3\)) \(_2\)=12.10grams

According to law of conservation f mass

mass of reactant = mass of product

Substituting the values we get

15.90g +  12.10g = mass of PbCl\(_2\)+ 8.40g

mass of PbCl\(_2\) =19.6g

Therefore the mass of PbCl\(_2\) is 19.6g.

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Answer:

Subjectivity

Explanation:

Took test Forensic Science

19.7 litre volume of carbon dioxide gas at 22.0o C and 102 kPa can be collected over water.

Vapour pressure is a measure of the tendency of a material to change into the gaseous or vapour state, and it increases with temperature.

Moles of Butane = mass in grams / molar mass = 11.6 / 58.12 = 0.2

Volume of \(O_2\) (V) = 40 liter

Temperature (T) = 22°C = 22 + 273 = 295 K

Pressure (P) = 102 kPa = 102 / 101.325 = 1.007 atm

Moles of \(O_2\) (n) can be calculated by ideal gas equation.

PV = nRT

n = 1.007 40 ÷ 0.0821 295 = 1.663

Balanced chemical reaction;

2\(C_4H_10\) + 13\(O_2\) ---> 8\(CO_2\) + 10\(H_2O\)

From reaction;

13 moles \(O_2\) require 2 moles \(C_4H_10\)

So, 1.663 moles \(O_2\) will require = 2 x 1.663 ÷13 = 0.256 moles of \(C_4H_10\)

Thus \(C_4H_10\) is a limiting reagent. So it will drive the yield of \(CO_2\).

Moles of \(CO_2\) produced = (8/2) 0.2 = 0.8 moles

Pressure of \(CO_2\) (P) = 102 - 2.24 = 99.76 kPa = 99.76  ÷ 101.325 = 0.985 atm

Applying the ideal gas equation for \(CO_2\),

PV = nRT

0.985 V = 0.8 0.0821 x 295

V = 19.7 liter

The volume of \(CO_2\) produced = 19.7 liter.

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Answer:

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Answer:

spacecraft, airplanes, cars

Answer: submarines, ships, spacecraft

Answer:

The equation for molarity is moles/liter for the first question you would do 0.256/0.143 liters to get 1.790 mol/L

Explanation:

The second problem you would do need to find the moles of NaCl which you would do by doing 4.89 g/58.44g/mol= 0.08367 then do 0.08367/0.600= 0.139 mol/L

The third problem would be the same steps as the second one.

The fourth problem would be (0.460M)(5.50L)= 2.53 moles

The molarity of a solution which contains 0.256 mol of a substance dissolved in 143 mL of solution is 1.79.

Molarity of a given solution is known as the total number of moles of solute per litre of the solution.  A solution that is 1.00 molar (written 1.00 M) contains 1.00 mole of solute for every liter of solution.

Molarity = (No. of moles of solute ÷ Volume of solution in liters)

The unit of molarity is mol L⁻¹.

Molarity is temperature dependent because as temperature changes, volume of the solution also changes.

Given,

No. of moles = 0.256

Volume of solution = 143ml

Molarity = (0.256 ÷ 0.143) = 1.79

Therefore, The molarity of a solution which contains 0.256 mol of a substance dissolved in 143 mL of solution is 1.79.

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Answer: 1, 3,4,2

Explanation: Solar Wind is a stream of charged particles, called Plasma, released from the surface of the sun. It is formed by the expansion of plasma from the Sun's outermost surface, known as Corona.

Inside the Sun, 4 atoms of hydrogen transform into Helium by a nuclear reaction called Fusion. This reaction produces energy, which travels to the surface. There, it decomposes into plasma, where it continues to heat up.

When the Sun's gravity can't hold it down, the gas streams along the Sun's magnetic field line. Because of the rotation of the Sun, the lines form huge spiral, creating a constant flow of "wind". They extend so far, it generates an interplanetary magnetic field (IMF), which surrounds all the planets in our solar system.

Modern continents hold clues to their distant past. Evidence from fossils, glaciers and complementary coastlines helps reveal how the plates once fit together. Fossils tell us when and where plants and animals once existed. Some life "rode" on diverging plates, became isolated, and evolved into new species.

Earthquakes, mountain building and volcanic activity occur mostly at the boundaries of the moving plates. Only shallow earthquakes occur where plates diverge at mid-ocean ridges, whereas earthquakes extend to a great depth where plates converge at subduction zones. Magma generation, igneous intrusions, metamorphism, volcanic action, earthquakes, faulting, and folding are usually the result of plate tectonic activity. The earth's crust is divided into six large pieces, and about twenty smaller pieces, by deep fault systems.

Answer:

C

Explanation:

because percentage yield =actual/theoretical yield

The statements best defines the percentage yield of a reaction will be "The amount of measured yield over calculated yield".

The quantity of material that actually forms during the process in a lab setting is known as the actual yield. The actual yield to theoretical yield ratio stated as a percentage has been known as even the percent yield.

Percentage yield can be expressed as:

Percentage yield =actual/theoretical yield

The volume of a chemical reaction's calculated yield would be its final product.

The statement best defines the percentage yield of a reaction will be "The amount of measured yield over calculated yield".

Therefore, the correct answer will be an option (C).

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We can balance the equation by adding coefficients:

NaHCO3 (s) + H3BO3 (s) → 3 Na3BO3 (ac) + 1 CO2 (g) + 3 H2O(l)

There are 3 Na, 3 B, 9 O, 1 C, 1 CO2, and 3 H on both sides of the equation, and the equation is balanced.

The reaction involves the decomposition of two solids (NaHCO3 and H3BO3) and the formation of a new solid (Na3BO3), a gas (CO2), and liquid water (H2O). This suggests that the reaction is likely to be exothermic, as the formation of a solid generally releases energy, and the decomposition of a solid generally requires energy.

An endothermic reaction is a chemical reaction that absorbs heat from the surrounding environment, decreasing the surrounding system's temperature. The energy absorbed is usually in the form of heat but can also be light or electricity.

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Answer:

Option A - nucleus

Explanation:

A molecule is formed when two or more atoms join together chemically. If atoms combine that are of two or more different elements, we call that a compound. All compounds are molecules, but not all molecules are compounds.

Two atoms combine to form a molecule.

What is a molecule?

What is a nucleus?

What is a proton?

What is an electron?

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Answer:

A

Explanation:

A mixture is formed when two or more substances are physically mixed together. A compound is formed when two or more substances are chemically combined through a chemical reaction.

Answer: Dinitrogen Monoxide ( also called nitrous oxide )

is an inorganic ( not made from living matter) compound with the chemical formula of N2O.

Explanation:

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