Low-pressure systems usually mean ____ weather.
extremely hot
cloudy
windy
fair

Polar molecules dissolve as well as miscible in polar solvents, while nonpolar molecules dissolve and miscible in nonpolar solvents.

Polarity is indeed a division of electric charge in chemistry that results in a molecule and its chemical groups possessing and electric dipole moment with a negative charges end as well as a positive charge end.

Atoms prefer to adopt the configuration of noble gases in order to achieve stability. As a result, we may deduce that chemical bonding was responsible for atom stability and the formation of molecules. Polar molecules dissolve as well as miscible in polar solvents, while nonpolar molecules dissolve and miscible in nonpolar solvents.

Therefore,  polar molecules dissolve as well as miscible in polar solvents, while nonpolar molecules dissolve and miscible in nonpolar solvents.

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T he H2 + CH2=CH2-------- CH3CH3 is the reducing and oxidizing agents .

What is reducing agents?

The electron donor is a reducing substance, which is usually in one of its lower oxidation states. Because it gives up electrons in the redox reaction, a reducing agent becomes oxidized. The earth metals, formic acid, and sulfite compounds are a few examples of reducing agents.

What is oxidizing agents?

A substance or element that participates in an oxidation-reduction (redox) reaction and receives electrons from a separate species is known as an oxidizing agent. An oxidant is a chemical molecule that readily exchanges oxygen or other material atoms for an electron.

Therefore,  H2 + CH2=CH2-------- CH3CH3 is the reducing and oxidizing agents.

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Answer:

The emission spectrum of gold shows a line of wavelength 2.676 x 10-7 m. How much energy is emitted as the excited electron falls to the lower energy level?

(a) 7.43 x 10-19 J

(b) 5.30 x 10-20 J

(c) 6.05 x 10-19 J

Answer:

condensation

Explanation:

the water has condensed from the gaseous form into rain drops

Answer:

precipitation

Explanation:

The volume of the gas at STP would be 23.93 liters.

The volume of gas at STP (Standard Temperature and Pressure), we need to use the Ideal Gas Law, which states that PV = nRT, where P is pressure, V is volume, n is the number of moles of gas, R is the gas constant, and T is temperature. First, we need to calculate the number of moles of gas in the initial sample. We can use the formula n = PV/RT, where P is the initial pressure, V is the initial volume, R is the gas constant, and T is the initial temperature.
n = (2.31 atm) x (25.15 L) / [(0.0821 L atm/mol K) x (201 + 273.15 K)]
n = 1.067 moles

Now, we can use the molar volume of gas at STP, which is 22.4 L/mol, to calculate the volume of gas at STP.
V = n x 22.4 L/mol
V = 1.067 moles x 22.4 L/mol
V = 23.93 L
Therefore, the volume of the gas at STP would be 23.93 liters.

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The combined gas law, which links a gas's pressure, volume, and temperature, can be used to solve this issue. When the balloon reaches an altitude with a pressure of 0.65 atm and a temperature of -150 C, its capacity will fall to 4.9 L.

The Centigrade scale, Celsius size, and Kelvin scale are the three scales that are most frequently used to measure temperature.Any item contains molecules that move or vibrate. Its temperature will rise when it is heated because the molecules are moving more quickly.A tool called a thermometer is used to measure it. the three units used to measure temperature.

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Answer:

1. expanding

2. red, blue

3. red, spreading out

Explanation:

The mass of the asteroid is C. 1.2 x \(10^{12}\) Kg

To find the mass of the other asteroid, we can rearrange the equation for the gravitational force between two objects:

F = (G * m1 * m2) / \(r^{2}\)

where F is the force of gravity, G is the gravitational constant, m1 and m2 are the masses of the two asteroids, and r is the distance between them.

Given that the distance between the asteroids is 75000 m, the force of gravity between them is 1.14 N, and one asteroid has a mass of 8 x \(10^{7}\) kg, we can substitute these values into the equation and solve for the mass of the other asteroid (m2):

1.14 N = (6.67430 × \(10^{-11}\) N \(m^{2}\)/\(Kg^{2}\) * 8 x \(10^{7}\) kg * \(m2\)) / \((75000 m)^{2}\)

Simplifying and solving the equation, we find that the mass of the other asteroid (m2) is approximately 1.2 x \(10^{12}\) kg. Therefore, Option C is correct.

The question was incomplete. find the full content below:

Two asteroids are 75000 m apart one has a mass of 8 x \(10^{7}\) kg if the force of gravity between them is 1.14 what is the mass of the asteroid

A. 3.4 x \(10^{11}\) kg

B. 8.3 x \(10^{12}\) kg

C. 1.2 x \(10^{12}\) kg

D. 1.2 x \(10^{10}\) kg

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Answer: the concentration of the prepared solution is 0.47 M and the concentration of Na+ ions in this solution is 0.97 M.

Explanation:

The question requires us to calculate the molar concentration of a prepared sodium carbonate (Na2CO3) solution and the concentration of sodium ions (Na+) in this solution.

The following information was provided by the question:

mass of salt used = m = 5.0 g

volume of solution = V = 100 mL

molar mass of sodium carbonate = MM = 106 g/mol

We can calculate the molar concentration of the solution using the following equation:

where M is the molarity of the solution (in mol/L or M), n is the number of moles (in mol), and V is the volume of solution (in L).

Since the volume was given in mL, we need to convert it to L:

We also need to determine the number of moles of Na2CO3 in 5.0g of this salt:

106 g Na2CO3 ---------------- 1 mol Na2CO3

5.0 g Na2CO3 ----------------- x

Solving for x, we have that there are 0.047 moles of Na2CO3 in 5.0g of this salt.

Now, applying these values to the equation for molar concentration:

Therefore, the concentration of the prepared solution is 0.47 M.

The concentration of Na+ ions can be obtained from the dissociation of Na2CO3:

According to the dissociation equation, each mol of Na2CO3 produces 2 moles of Na+. Therefore, a 0.47 M Na2CO3 solution should contain 0.47 * 2 = 0.94 M Na+ ions.

This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97. The incorrect representation for a neutral atom is 36Li

To determine the correct representation for a neutral atom, we need to consider the atomic number (Z) and mass number (A) of the element. The atomic number represents the number of protons in the nucleus, while the mass number represents the sum of protons and neutrons.

Let's analyze the given representations:

36Li:

This representation suggests that the element is lithium (Li) with a mass number of 36, which is incorrect. The correct mass number for lithium is approximately 6.94.

613C:

This representation suggests that the element is carbon (C) with a mass number of 13, which is correct. Carbon has different isotopes, and 13C represents one of its stable isotopes.

3063Cu:

This representation suggests that the element is copper (Cu) with a mass number of 63, which is correct. Copper has different isotopes, and 63Cu represents one of its stable isotopes.

1530P:

This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97.

Therefore, the incorrect representation for a neutral atom is 36Li, as it does not match the known properties of lithium.

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The Voltage is the pressure from the electrical circuit of the power source that passes the current.

The Voltage is defined as the pressure from the electrical circuit of the power source that will passes the charged electrons that is the current through the conducting loop, it will enable them to do work  because of the illuminating the light. The in simple terms is : voltage = pressure, and it is denoted as the volts and the symbol is the V.

The voltage is described as the force that causes the flow of the charged particles. The Voltage is also called as the electromotive force.

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Oxygen can produce both ionic and covalent connections. Numerous oxides contain the oxide ion, O2 but water hydrolyzes it, making it impossible for it to reside there.

When it is in its elemental condition, oxygen is a diatomic molecule, like hydrogen. Only six electrons are available to each oxygen, thus two bonds must be formed by sharing these electrons. Double bonds serve as an illustration of this.

Detailed response and defense The hydrogen and oxygen atoms in water are covalently bound. This is because the difference in electronegativity between oxygen and hydrogen prevents the oxygen atom from completely stealing the electron from each hydrogen atom.

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The atom present in Option (1) most likely to form cation with a charge of +1

A cation has more protons than electrons, consequently giving it a net positive charge.

For a cation to form, one or more electrons must be lost, typically pulled away by atoms with a stronger affinity for them.

The atoms present in Option 1 have one eletron in its outermost shell therefore, it is easy for the atom to lose one elecron than more electron  and to attain stable electronic confiuration.

Hence, The atom present in Option (1) most likely to form cation with a charge of +1

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The concept half life is used here to determine the mass of 'A' remaining after 0.731 min. The rate constant of a reaction is defined as the rate of the reaction when the molar concentration of each of the reactants is unity. The mass of A remaining is 5.163 g.

The half life period of a reaction is defined as the time in which the concentration of a reactant is reduced to half of its initial concentration. The expression for half life period of a first order reaction is:

\(t _{1} /_{2} = 0.693 / k\)

k - rate constant

k = 0.693 / 0.0459 = 15.098 s

Divide by 60 to convert half life into minutes.

15.098 s = 0.251 minutes

The number of half lives that have past is:

0.731 min / 0.251 min = 2.912 ≈ 3

Initial mass / number of half lives = 15.49 / 3 = 5.163 g

Thus the mass of A remaining after 0.731 min is 5.163 g.

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Answer:

Explanation:

Yes! True.

But your choices are really limited and if you expand them, you run into the problem of dealing with someone you don't know and that has its own set of problems. For example, how reliable are they? Do they have a track record that you can follow (like who else has dealt with them). How secure is their site if you want to deal with them and have to provide a credit card number?

So if you want to compare the big box stores (Amazon, Walmart, Home Depot if applicable), those are the stores that make up my yes.

Answer:

Explanation:

The number of atoms that remains after 3 half-lives given that it was originally 300000 atoms is 37500 atoms

Data obtained from the question

Original amount (N₀) = 300000 atoms

Number of half-lives (n) = 3

Amount remaining (N) =?

How to determine the amount remaining

The amount remaining after 3 half-lives can be obtained as illustrated below:

N = N₀ / 2ⁿ

N = 300000 / 2³

N = 300000 / 8

N = 37500 atoms

Taking the length & width if your area, then putting those two figures together to obtain the size in feet squared, is how you compute a rectangle area (ft2). A typical sort of skin growth is called a mole.

A typical sort of skin growth is the mole (nevus). Clusters of purple cells are what cause them, which frequently manifest as tiny, dark brown spots (melanocytes). The majority of people possess 10 to 40 moles 1st form throughout adolescence and childhood and may change or disappear over time.

It takes 6.022 1023 units of a chemical to make up one mole . Avogadro's constant or Avogadro's constant are both designations for the number 6.022 1023. In order to convert between particle mass and number, the mole concept might be employed. Sal Khan is the author.

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1.12 is the number of mole  of SO\(_3\) molecules are in a sample of SO\(_3\) that has a mass of 90.0 g. The same amount of gases under identical circumstances ought to have the same amount of molecules.

In chemistry, a mole, usually spelt mol, is a common scientific measurement unit for significant amounts of extremely small objects like atoms, molecules, and other predetermined particles. The same amount of gases under identical circumstances ought to have the same amount of molecules, according to Avogadro's theory, which was successful in calculating atomic therefore molecular weights and gave rise to the idea of the mole. In commemoration of the Italian scientist Amedeo Avogadro (1776–1856), the quantity of units in a mole is also known as Avogadro's number or Avogadro's constant.

number of mole = given mass/ molar mass

                           =90.0/80.06

                           =1.12mole

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Answer:

Cations have a smaller ionic radius than the neutral atom from which they were formed because its nucleus becomes more positively charged when an atom loses electrons. Thus it attracts any remaining electrons more strongly, resulting in a smaller size.

Explanation:

Explanation:  C) the air temp. at the top is lower

Answer:

Ba>Sn>Pb>As>S

Explanation:

Hello,

In this case, we can write the atomic radius for the given elements:

\(r_{Ba}=268pm\\r_{Sn}=225pm\\r_{S}=100pm\\r_{Pb}=202pm\\r_{As}=185pm\)

In such a way, the required order is:

Ba>Sn>Pb>As>S

This is also in agreement as a periodic trend which states that the higher the period, the higher the radius.

Regards.

The statement that is true of a Lewis base is that a Lewis base donates electron pairs (option A).

A Lewis base is any nucleophylic compound that can donate a pair of electrons and form a coordinate covalent bond.

On the other hand, a Lewis acid is any electrophylic compound that can accept a pair of electrons and form a coordinate covalent bond.

This means that a Lewis base can donate a pair of electrons to a Lewis acid to form a product containing a coordinate covalent bond. This product is also referred to as a Lewis adduct.

Therefore, option A is correct about Lewis base

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The weight of 5.6 L of chlorine gas Cl₂ at NTP is 17.75 grams

The volume of a gas at normal temperature and pressure, NTP, is given as

22.4 L = 1 mole of a gas

With the above information, we can obtain the weight (in grams) of the 5.6 L of chlorine gas Cl₂. This is shown below.

The following data were obtained from the question:

At normal temperature and pressure, NTP, the volume of chlorine gas is given as follow:

22.4 L = 1 mole of chlorine gas, Cl₂

22.4 L = 71 grams of chlorine gas, Cl₂

Therefore,

5.6 L = (5.6 L × 71 grams) / 22.4 L

5.6 L = 17.75 grams of chlorine gas, Cl₂

Thus, we can conclude from the above calculation that the weight of the gas at NTP is 17.75 grams

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120 ppm is the most likely associated with a carbon atom of an aromatic ring.

This is due to the fact that in 13C NMR spectroscopy, aromatic rings often resonate at levels between 100 and 150 ppm. This is as a result of the ring's electrons being delocalized, which increases the ring's electron density. The carbon atoms in the ring are shielded more magnetically as a result of the increased electron density, which makes them appear as a peak at a lower frequency on the NMR spectrum. The other values on the list are either too high or too low to be connected to an aromatic ring.

A type of spectroscopy called nuclear magnetic resonance (NMR) spectroscopy employs the magnetic characteristics of certain nuclei to ascertain the structure of molecules. This method can be used to identify the type of chemical bonding as well as the structure of complex compounds like proteins and carbohydrates. The method is also employed to research the behaviour of molecules in solutions and to analyse the kinetics of chemical reactions.

A potent method for examining the structure and make-up of organic compounds is 13C NMR spectroscopy. It is based on the idea that when exposed to a magnetic field, the nuclei of some atoms act in a different way. Chemists can identify and count the many types of carbon atoms present in a molecule using 13C NMR spectroscopy, which examines the chemical environment of the carbon atoms in a molecule. Additionally, it can reveal details about the other atoms in the molecule's chemical environment, such as the kinds of bonds they make and the separations between them.

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Answer:

no

Explanation:

Answer:

Yes

Explanation:

Adding food coloring to batter or to your icing involves a chemical reaction of the two products bonding together. This bonding process starts when you add the color and mix it in, but it doesn't end straight away as the color needs some time to fully integrate and settle.

When studying a Chemical Change, we can see that it does in fact alter the composition of the original matter. This means that the answer is B) there is a change in composition. For the other 3 to occur, the change would need to be a physical change, which does not change composition, does change the state of matter, but not all physical properties remain the same.

I hope this helps! :)

Answer:

Copper will start to react with the oxygen in the air to form copper oxide. The copper oxide will continue reacting to oxygen over time. As the copper oxide continues to react with carbon dioxide and water in the air it coats the surface with that iconic blue-green patina colour

The statement "The orbit of a comet is one of nature's cycles" is True because The orbit of a comet is a natural cycle that follows the laws of physics and determines its path around the Sun.

Comets have highly elliptical orbits that can take them far away from the Sun and then back again, following a predictable cycle that can span many years or even centuries. This cycle of orbit is a natural phenomenon that occurs due to the gravitational forces of the Sun and other celestial bodies.

Comets are celestial bodies that follow an elliptical orbit around the Sun. Their orbit is determined by the gravitational forces acting on them from the Sun and other celestial bodies, such as planets and moons. The path of a comet is predictable and follows the laws of physics, which govern the motion of all celestial bodies.

As the comet approaches the Sun, it heats up and releases gas and dust, creating a glowing tail that can be seen from Earth. This tail always points away from the Sun, due to the solar wind blowing the gas and dust particles away from the comet.

The orbit of a comet is a natural cycle that repeats itself over time. Depending on the shape and size of the comet's orbit, its cycle can span many years or even centuries. For example, Halley's Comet, one of the most famous comets, has an orbit that takes it around the Sun every 76 years. This means that it follows a predictable cycle, and astronomers can calculate when it will be visible from Earth again.

In summary, the orbit of a comet is a natural cycle that is determined by the laws of physics and the gravitational forces of celestial bodies. This cycle determines the path of the comet around the Sun and can span many years or even centuries.

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Answer:

Volume = 3.4 L

Explanation:

In order to calculate the volume of CO₂ produced when 15.2 g of CaCO₃ is heated, we need to first write out the balanced equation of the thermal decomposition of CaCO₃:

CaCO₃ (s) + [Heat] ⇒ CaO (s) + CO₂ (g)

Now, let's calculate the number of moles in 15.2 g CaCO₃:

mole no. = \(\mathrm{\frac{mass}{molar \ mass}}\)

                 = \(\frac{15.2}{40.1 + 12 + (16 \times 3)}\)

                 = 0.1518 moles

From the balanced equation above, we can see that the stoichiometric molar ratios of CaCO₃ and CO₂ are equal. Therefore, the number of moles of CO₂ produced is also 0.1518 moles.

Hence, from the formula for the number of moles of a gas, we can calculate the volume of  CO₂:

mole no. = \(\mathrm{\frac{Volume \ in \ L}{22.4}}\)

⇒ \(0.1518 = \mathrm{\frac{Volume}{22.4}}\)

⇒ Volume = 0.1518 × 22.4

                 = 3.4 L

Therefore, if 15.2 g of CaCO₃ is heated, 3.4 L of CO₂ is produced at STP.