Help. The third and last question are
3 A 2- N force presses down on the marble at the same time as a 1.5N force acts on the right side of the marble
4 A marble rolling downhill suddenly comes to rest at a garden wall

1. ionic NaCl

2. covalent CO2

3.metallic ZnCu

Answer: 18.42 grams of lead (II) sulfide will be produced in the given reaction:

Explanation: The reaction of lead (II) acetate and hydrogen sulfide follows:

[tex](CH_3COO)_2Pb+H_2S\rightarrow PbS+2CH_3COOH[/tex]

To calculate the moles, we use the formula:

[tex]Moles=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]    ....(1)

Molar mass of lead (II) acetate = 325.29 g/mol

Given mass of lead (II) acetate = 25 g

Putting values in above equation, we get:

[tex]Moles=\frac{25g}{325.29g/mol}=0.0768moles[/tex]

We are given that hydrogen sulfide is present in excess, so limiting reagent is lead (II) acetate because it limits the formation of product.

By stoichiometry of the reaction,

1 moles of lead (II) acetate produces 1 mole of lead (II) sulfide

So, 0.0768 moles of lead (II) acetate will produce = [tex]\frac{1}{1}\times 0.0768[/tex] = 0.0768 moles of lead (II) sulfide.

Now, to calculate the mass of lead (II) sulfide, we use equation 1, we get:

Molar mass of lead (II) sulfide = 239.3 g/mol

[tex]0.0768mol=\frac{\text{Given mass}}{239.3g/mol}[/tex]

[tex]\text{Mass of lead (II) sulfide}=18.42g[/tex]

When 25.0 g of lead (II) acetate reacts with excess hydrogen sulfide, 18.37 grams of lead (II) sulfide are produced, based on stoichiometry and molar mass calculations.

To calculate the number of grams of lead (II) sulfide produced when 25.0 g of lead (II) acetate reacts with excess hydrogen sulfide, first, you need to write the balanced chemical equation for the reaction:

Pb(C₂H₃O₂)₂+ H2S ightarrow PbS + 2C₂H₄O₂

This indicates that one mole of lead (II) acetate produces one mole of lead (II) sulfide. Next, find the molar mass of lead (II) acetate and lead (II) sulfide:

Molar mass of Pb(C₂H₃O₂)₂ = 325.29 g/mol

Molar mass of PbS = 239.26 g/mol

Then, calculate the number of moles of lead (II) acetate:

25.0 g Pb(C₂H₃O₂)₂ times (1 mol / 325.29 g) = 0.0768 mol

Assuming complete reaction and that lead (II) acetate is the limiting reagent, the same number of moles of PbS will be formed. Finally, calculate the mass of PbS:

0.0768 mol PbS times (239.26 g/mol) = 18.37 g of PbS

Therefore, 18.37 grams of lead (II) sulfide are produced.

Gamma Decay in the nucleus is similar to Photon Decay in atoms. When a electron charges energy levels in the atoms, it  desposes of photon (with energy of order electron volts).

Answer:

1. It contains only one element.

Step-by-step explanation:

The formula of fullerene is C₆₀.

Fullerene is a compound. One molecule of fullerene contains 60 atoms of one element, carbon.

2. is wrong, because fullerene consists of only one element.

3. and 4. are wrong, because fullerene is a compound.

None Of the Above

Is the answer

Hope this helped plz mark

Hi There!

Question - What is a stationary front?

Answer - None of the above.

Why - The reason I say this because in a stationary front its made of low pressure systems so its not A or B. The wind blows the low pressure system which cause precipitation. If its not D then is C.

Hope This Helps :)

The uranium within these items is radioactive and should be treated with care. Uranium's most stable isotope, uranium-238, has a half-life of about 4,468,000,000 years. It decays into thorium-234 through alpha decay or decays through spontaneous fission.

1 and 2 are a metal - nonmetal pair - that kinda means ionic bond. Na and F are going to lose electrons.

3 [Nonmetals bond to each other covalently! Ne and O are nonmetals. O would need 2e to become stable. Either getting 2e (ionic bond) or sharing 2e (with H, for example). However, Ne is a noble gas, which means it is already doing fine with its 8e on its valence shell and isn't gonna share 2e of its electrons with O. So, despite the fact that they are both nonmetals, they won't form a covalent bond.

Sum up: they are 2 gases haha, and one of them is a noble one. They will never bond to each other covalently

4 - C and S - right answer

As they are both nonmetals (nonmetals bond to each other covalently, none of them is a noble gas, and so on)

When light with a continuous spectrum (emitted by a black body) passes through a cool transparent gas, dark lines are observed in the continuous spectrum.

Answer is dark lines

When light from a black body having a continuous spectrum passes through a cool transparent gas, observed in the continuous spectrum are absorption and emission.

The black body is an object or material of black color which absorbs the lights of every type of wavelength either it is blue of the lowest wavelength or red of the highest wavelength.

The radiation emitted by a black body is called the radiation of a black body. The stars almost act like a black body. The amount of radiation emitted by the length of each wavelength depends only on the temperature of the object.

Therefore, light from a blackbody having a continuous spectrum passes through a cool transparent gas, observed in the continuous spectrum are absorption and emission.

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assume you have 1 mole (or any other number, it doesn't matter). Mass = 206.98 g/mole. This is straight from the molar mass so that's why I like to use 1 mole  

From the chemical formula, 1 mole of Ca(ClO3)2 contains 6 moles of oxygen atoms.  

Mass of 6 moles of O atoms = 6 moles * 16 g/mole = 96 g  

mass % oxygen = 96 g / 206.98 g * 100 = 46.4%.  

You could also do it on a mole percent. 1 mole of Ca(ClO3)2 contains 9 moles of atoms.  

6 moles of these are oxygen atoms so the mole % = 6 moles / 9 moles * 100 = 66.7 mole %

If you mean percent by weight or percent by composition? Ca(ClO3)2 is 67% O by composition (number of atoms) and, as calculated by Ricki, 46% by weight.

The percentage composition of oxygen in the compound Ca(ClO₃)₂is approximately is 46.38%.

Percent composition is defined as a convenient way to record concentration of solution.It is a expression which relates one element to compound as,mass of element/mass of compound ×100.Percent compositions helps in determination of amount of an element which is present in the compound.

Percent composition of a compound or an element is usually in terms of grams of an element or a compound.

In the given example, molar mass of calcium chlorate is 206.98 g/mole and that oxygen present in it is 96 g/mol,substituting these values in above formula we have, 206.98/96×100=46.38 %

Thus, the percentage composition of oxygen in the compound Ca(ClO₃)₂is approximately is 46.38%.

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3

is the answer i do believe

Long, the ocean tides we experience on earth are caused by the sum of the moon's gravitational gradient and the sun's gravitational gradient. When the sun and the moon are aligned, or nearly aligned, their gravitational gradient fields add together constructively, leading to extra strong tides (high tide is extra high and low tide is extra low). This alignment happens when the moon is a new moon or a full moon, which occurs about every two weeks. The moon takes about a month to orbit the earth, hence strong tides occur about twice a month. In contrast, when the sun and the moon are unaligned, their gravitational gradients tend to cancel out, leading to weak tides (high tide is not very high and low tide is not very low). But even when the sun and moon are perfectly unaligned (they form a 90 degree angle relative to the earth), there are still tides because the moon's gravitational gradient is stronger than the sun's. The sun's gravitational gradient never completely cancels out the moon's. The biweekly strong tides are called "spring tides" even though they occur all year long. The name does not refer to the season "Spring", but to the verb "spring" which means to leap forth, because the strong high tides leap higher up the shore. The biweekly weak tides are called "neap tides".

The Sun and Moon's gravity causes Earth's tides, with the Moon having a greater effect due to its proximity. Spring tides happen when the Earth, Moon, and Sun are aligned, and neap tides occur when the Sun and Moon are at a 90° angle.

The gravity of the Sun and the Moon significantly affects the Earth's tides through a phenomenon known as the tidal effect. Although the gravitational pull of the Sun is nearly 200 times that of the Moon, the tidal effect of the Moon is stronger because of its closer proximity to Earth. The gravitational forces of these celestial bodies cause bulges in Earth's oceans, creating high tides on the sides of Earth closest and farthest from the Moon, and to a lesser extent, from the Sun. This variability in high tides is due to the different positions of the Sun and Moon relative to Earth. The largest tides, known as spring tides, occur when the Earth, Moon, and Sun are aligned, while the smallest tides, neap tides, happen when the Sun and Moon are at 90° angles relative to Earth.

B. Physical weathering will cause the ice to crack the rock.

Answer:

The correct answer is B.

Explanation:

The Earth's surface as water freezes and expands on a mountain slope will cause ice to break the rock. This occurs because the ice occupies a larger volume than the liquid, so it displaces the rock and causes it to break. When the water that accumulates in the rocks freezes, its volume increases in solid-state and exerts a greater pressure, enough to break the rock.

Have a nice day!

We should definitely seek shade to sun exposure between 10 A.M. and 4 P.M.

Hope this helped!

Muscles protect the network of nerves that run throughout the body

Answer:

Muscles protect the network of nerves that run throughout the body

Explanation:

I thank to

Answer: The correct answer is Option b.

Explanation:

Single displacement reaction is defined as the reaction in which more reactive element displaces a less reactive element from its chemical reaction.

The reactivity of metal is determined by a series known as reactivity series. The metals lying above in the series are more reactive than the metals which lie below in the series.

When calcium metal reacts with hydrochloric acid, it leads to the formation of a salt known as calcium chloride and also releases hydrogen gas.

The chemical equation for the above reaction follows:

[tex]Ca(s)+2HCl(aq.)\rightarrow CaCl_2(s)+H_2(g)[/tex]

Hence, the correct answer is Option b.

S+O2 =SO2 SULFUR DENOTE S  

TWO ATOM OF OXYGEN DENOTE O2

The answer is "opposite charges."

When clothes are removed from the dryer and cling together, it is because static electricity is created from the clothes rubbing together in the dryer. This results in an imbalance of electrical charge on the clothes, with some having a net positive charge and others a net negative charge, which makes them attract and stick to each other.

When clothes are removed from the dryer and they cling together, this is due to the presence of static electricity. Static electricity occurs when materials are rubbed together, causing an exchange of electrons. This exchange results in the materials being electrically charged. In the case of your dryer, the process of tumbling and rubbing the clothes together can strip electrons from the clothes and deposit them on other pieces.

This creates an imbalance in charge, leading to some clothes having a net positive charge and others with a net negative charge. The positively charged clothes are attracted to the negatively charged ones, and this attraction causes the clothes to stick together. The force that brings these different charged clothes together is called electrostatic force. If the clothes are damp, the presence of water molecules can suppress the charge, reducing the static cling.

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Answer: Option (A) is the correct answer.

Explanation:

Physical change is defined as a change that does not bring any changes in the chemical properties of a substance.

For example, solubility, density, volume etc are all physical changes.

When sugar dissolves in water then it is a physical change.

Whereas color change may not necessarily shows a physical change because a chemical change can also lead to color change of a solution or substance.

For example, rusting of iron is a chemical reaction in which color change also occurs.

Hence, we can conclude that a solid dissolves when added to a liquid is most clearly an example of a physical change.

The answer would be 8 m/s. To find the answer you divide distance by time which is 16 divided by 2.

This is im 90% sure false because if an object is bigger it doesnt mean that its temperature is higher :)

The unstable atomic nucleus of Uranium-238 emits ionizing particles and loses energy in order to achieve a stable state. This process is called the Radioactive decay. This isotope undergoes Alpha decay by emitting Alpha rays. It has a decay energy of 4.267 MeV.

Final answer:

The decay of uranium-238 to thorium-234 is represented by a nuclear equation that must balance in terms of both mass numbers and atomic numbers, owing to conservation laws. The emission of an alpha particle during the decay of U-238 results in Th-234, with the mass number decreasing by 4 and the atomic number by 2.

Explanation:

When uranium-238 decays to form thorium-234, this is represented by a nuclear equation owing to the transformation occurring within an atomic nucleus. According to conservation of mass and atomic numbers, the nuclear equation must balance, both in terms of the mass numbers and the atomic numbers. Considering uranium has an atomic number of 92 (Z = 92) and a mass number of 238, when it loses 2 protons and 2 neutrons which occurs during the emission of an alpha particle (He), we are left with thorium-234 (Th).

The balanced nuclear equation for this decay process is:

^238_92U → ^4_2He + ^234_90Th

This shows the loss of an alpha particle from uranium-238 which results in thorium-234. The sum of the mass numbers and atomic numbers on the reactant side must equal the sum on the product side, hence confirming that the equation is correctly balanced. The loss of four nuclear particles (2 protons and 2 neutrons) is accounted for by the alpha particle, reducing the mass number by 4 from 238 to 234, and dropping the atomic number from 92 to 90 which identifies the new element as thorium. Furthermore, this decay sequence continues as thorium-234 decays via beta emission to form protactinium-234, which then decays to uranium-234.

Weathering is the process of breaking large rocks and boulders into much smaller ones. Weathering can be brought about by wind and water mostly. Sometimes even biological forces account for some types of weathering.

There are different formula you need to keep in mind when solving for [OH-]

Given that pH = 6.10

pH + pOH = 14

6.10 + pOH = 14

pOH = 7.9

[OH-] = 10^(-pOH)

[OH-] = 10^(-7.9)

[OH-] = 0.000000013

[OH-] = 1.3 x 10^-8

The hydroxide ion concentration in an aqueous solution is equal to 10⁻⁸M.

pOH can be determined by taking the negative logarithm of the hydroxide ions concentration in the given aqueous solution.

Mathematically, pOH can be expressed in the form of hydroxide ion concentration as follows:

pOH = - log  [ OH⁻]                                                

and, [tex]pH + pOH = 14[/tex]                                                        ..............(1)

where [OH⁻] is the hydroxide ions concentration present in an aqueous solution.

Given, the value of pH of the solution containing hydroxide ions:

pH = 6.10

Substitute the value of the pH in equation (1):

pH - log [OH⁻] = 14

6.10 - log [OH⁻] = 14

log [OH⁻] = - 7.9

[OH⁻] = [tex]10 ^{-7.9}[/tex]

[OH⁻] ≈ 10⁻⁸ M

Therefore, the concentration of the hydroxide ions in an aqueous solution is equal to 10⁻⁸ M.

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3+

So, compounds of boron contain boron in a positive oxidation state, generally +3. The sum of oxidation numbers of all constituent atoms of a given molecule or ion is equal to zero or the charge of the ion, respectively. ... In most of the stable compounds of boron, its oxidation number is +3

"The charge oxidation state for boron in its compounds is typically +3.

To understand why boron typically has an oxidation state of +3, one must consider the electron configuration of boron and its position in the periodic table. Boron is the first element in group 13 (IIIa) and has an electron configuration of [tex]1s^2 2s^2 2p^1[/tex]. This means it has three electrons in its outermost shell.

In chemical compounds, boron tends to form three covalent bonds with other atoms to fill its outer shell, achieving an octet configuration similar to that of noble gases. By sharing its three valence electrons with other atoms, boron effectively loses three electrons, which corresponds to an oxidation state of +3.

For example, in the compound boron trifluoride (BF3), boron forms three covalent bonds with fluorine atoms. Each fluorine atom has seven electrons in its outer shell and needs one more electron to complete its octet. By sharing one electron with boron, each fluorine atom completes its octet, and boron, by sharing three electrons, also achieves a stable configuration. In this compound, boron has an oxidation state of +3 because it has effectively lost three electrons to the more electronegative fluorine atoms.

Similarly, in other boron compounds like boron trioxide[tex](B_2O_3)[/tex]or boron nitride (BN), boron also exhibits an oxidation state of +3. This is a characteristic feature of boron's chemical behavior and is a direct consequence of its electron configuration and its position in the periodic table.

a) P^2=a^3=30.6^3=28650

b) P=28650=169 years

Final answer:

Neptune takes approximately 165 Earth years to complete one orbit around the sun, as it orbits at a distance of 30 AU from the sun.

Explanation:

The orbital period of Neptune, which is the time it takes for Neptune to complete one orbit around the sun, is approximately 165 Earth years. This is because Neptune orbits at an average distance of 30 astronomical units (AU) from the sun. One AU is the average distance between the Earth and the Sun, which is about 1.496×108 km. Given that Neptune is 4.490×109 km away from the Sun, and considering the substantial distance as compared to Earth's orbit, Neptune's year is much longer.

An atom's atomic number equals the number of protons and in a neutral atom, also, the number of electrons. The mass number equals the total number of protons and neutrons. Subtracting the atomic number from the mass number gives the number of neutrons.

In order to determine the number of protons, neutrons, and electrons an atom has, you need to understand the key terms: atomic number and mass number. The atomic number of an element represents the number of protons in an atom and, in a neutral atom, this also equals the number of electrons. The mass number (or atomic mass) is the total amount of protons and neutrons in an atom. To find out the number of neutrons in an atom, you subtract the atomic number from the mass number. Hence, if the atomic number (Z) represents the number of protons and the mass number (A) represents the number of protons plus neutrons, the formula A - Z = number of neutrons can be used to find the number of neutrons in an atom.

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Answer:

It should be -2; like hydrogen sulfide H2S

Explanation: