Why are fossil records important to geology?

Fossil records help with rock formation.
Fossil records provide evidence of the age of the Earth.
Fossil records provide information of different types of land formation.
Fossil records help support ideas and laws found in geology.

There are 2.64 × 1022 molecules of sucrose present in this serving of fruit dessert containing 15.0 g of sugar.

To determine the number of molecules of sugar present in the serving, we need to calculate the number of moles of sugar and then convert it to the number of molecules.

Given:

Mass of sugar (sucrose) = 15.0 g

Molar mass of sucrose (C12H22O11) = 342 g/mol

First, calculate the number of moles of sugar using the formula:

Number of moles = Mass of substance / Molar mass

Number of moles of sugar = 15.0 g / 342 g/mol ≈ 0.0439 mol

Next, we use Avogadro's number, which states that there are approximately 6.022 × 10^23 molecules in one mole of a substance. Therefore, to find the number of molecules of sugar:

Number of molecules = Number of moles × Avogadro's number

Number of molecules of sugar = 0.0439 mol × 6.022 × 10^23 molecules/mol ≈ 2.64 × 10^22 molecules

Therefore, there are approximately 2.64 × 10^22 molecules of sugar present in this serving.

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3. Proton is the subatomic particle which accounts for most of an atom's mass.

4. Electrons are the subatomic particle which accounts for most of atoms volume.

The volume of 2.46 M magnesium nitrate solution needed to make 275 mL of 0.758 M solution by dilution would be 84.6 mL.

To solve this problem, we can use the dilution formula, which is:

M1V1 = M2V2

where M1 is the initial concentration, V1 is the initial volume, M2 is the final concentration, and V2 is the final volume.

We can rearrange this equation to solve for the initial volume, V1:

V1 = (M2V2) / M1

Plugging in the given values, we get:

M1 = 2.46 M

M2 = 0.758 M

V2 = 275 mL = 0.275 L

V1 = (0.758 M)(0.275 L) / 2.46 M

V1 = 0.0846 L or 84.6 mL

Therefore, we need 84.6 mL of the 2.46 M magnesium nitrate solution to make 275 mL of a 0.758 M solution by dilution.

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The pressure, in atmospheres, exerted by a 0.100 mol sample of oxygen in a 2.00 L container at 273 °C is 2.24 × 10⁰ atm.

The pressure of a substance can be calculated using the following formula;

PV = nRT

According to this question, the pressure, in atmospheres, exerted by a 0.100 mol sample of oxygen in a 2.00 L container at 273 °C can be calculated as follows:

P × 2 = 0.1 × 0.0821 × 546

2P = 4.48266

P = 2.24 × 10⁰ atm

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Answer: The net ionic equation is \(2H^+(aq)+2F^-(aq)+Ba^{2+}(aq)+2OH^-(aq)\rightarrow BaF_2(s)+2H_2O(l)\)

Explanation:

The net ionic equation of any reaction does not include any spectator ions.

Spectator ions are defined as ions that do not get involved in a chemical equation. They are found on both the sides of the chemical reaction when it is present in ionic form.

The chemical equation for the reaction of hydrofluoric acid and barium hydroxide follows:

\(2HF(aq)+Ba(OH)_2(aq)\rightarrow BaF_2(s)+2H_2O(l)\)

The ionic form of the above equation follows:

\(2H^+(aq)+2F^-(aq)+Ba^{2+}(aq)+2OH^-(aq)\rightarrow BaF_2(s)+2H_2O(l)\)

There are no spectator ions in the ionic form.

The net ionic equation for the above reaction follows:

\(2H^+(aq)+2F^-(aq)+Ba^{2+}(aq)+2OH^-(aq)\rightarrow BaF_2(s)+2H_2O(l)\)

Answer:

erosion can be reduced by planting trees and other plants

Answer:

A

Explanation:

Answer:

ok, here is your answer

Explanation:

AI-generated answer

To find the mass of oxygen that reacted, we need to use the Law of Conservation of Mass, which states that in a chemical reaction, the mass of the reactants equals the mass of the products.

First, we need to find the number of moles of hydrogen that reacted:

Molar mass of hydrogen (H₂) = 2.016 g/mol

Number of moles of H₂ = mass/molar mass = 46.2 g/2.016 g/mol = 22.92 mol

Next, we need to use the balanced chemical equation to find the number of moles of water produced:

hydrogen + oxygen → water

2H₂ + O₂ → 2H₂O

From the equation, we can see that for every 2 moles of H₂, 1 mole of O₂ is required to produce 2 moles of H₂O. Therefore, the number of moles of O₂ required to produce 22.92 moles of H₂O is:

Number of moles of O₂ = 1/2 x 22.92 mol = 11.46 mol

Finally, we can find the mass of oxygen that reacted by using its molar mass:

Molar mass of oxygen (O₂) = 32.00 g/mol

Mass of oxygen = number of moles x molar mass = 11.46 mol x 32.00 g/mol = 366.72 g

Therefore, the mass of oxygen that reacted is 366.72 g.

The name of the substance that is recovered by scraping off the solid that sticks to the aluminum wire after heating is complete will depend on the specific experiment or reaction being conducted.

For example, if the experiment involved heating a mixture of sodium chloride and sulfuric acid, the solid that is recovered would be sodium sulfate. If the experiment involved heating copper carbonate, the solid that is recovered would be copper oxide. Similarly, if the experiment involved heating a mixture of iron filings and sulfur, the solid that is recovered would be iron sulfide.

In general, the name of the substance recovered after heating will be the product of the reaction that occurred during the heating process. It is important to carefully follow the instructions for the experiment and use appropriate safety precautions, such as wearing gloves and eye protection, when handling chemicals and conducting experiments in a laboratory setting.

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The number of gold atom : 1.204 x 10²¹

Given

0.6 g of 18 carat gold

mass number of gold = 197

24 carat as 100% gold

Required

The number of gold atom

Solution

Percentage of gold in 18 carat :

\(\tt \dfrac{18}{24}\times 100\%=75\%\)

Mass of gold in 0.6 g of 18 carat :

\(\tt 75\%\times 0.6~g=0.45~g\)

mol :

\(\tt mol=\dfrac{mass}{MW}=\dfrac{0.45}{197}=0.0023\)

A mole is a number of particles(atoms, molecules, ions)  in a substance

1 mole = 6.02.10²³ particles  

So the number of gold atom :

\(\tt 0.0023\times 6.02\times 10^{23}=1.204\times 10^{21}\)

Answer:

first hill

Explanation:

The first hill of a roller coaster is always the highest point of the roller coaster because friction and drag immediately begin robbing the car of energy. At the top of the first hill, a car's energy is almost entirely gravitational potential energy (because its velocity is zero or almost zero).

The density of the baby oil, ρ = 0.833 g/ml.

density = mass / volume

ρ = m / V

where,

ρ is density

m is mass

V is volume

So putting the values in the formula,

ρ = 10g / 12ml

ρ = 0.833 g/ml

The three most fundamental characteristics of an object are mass, volume, and density. Volume indicates something's size, mass indicates how heavy it is, and density is calculated as mass divided by volume. Although you deal with mass and volume on a daily basis, the concept of density is less clear-cut and requires careful consideration.

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Answer:

Your answer would be a buffer, they control pH levels.

Explanation:

Buffer is a substance that reacts with an acid or a base to control pH. Hence, option A is correct.

pH is a measure of how acidic/basic water is.

Buffers are solutions that resist a change in pH after adding an acid or a base. Buffers contain a weak acid (HA) and its conjugate weak base (A−).

Hence, option A is correct.

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a) 463.75kg/m²

b) 76,830.81 cm²

Given the following conversion rate:

• 1 inch = 2.54 cm

• 1ft = 12 in

• 1kg = 2.205

We are to convert the following parameter;

95.0lb/ft² to kg/m²

This can be further simplified as:

b) For the conversion:

82.7 ft² to cm²

If 1ft = 12 in

1ft² = 12²in²

1ft² = 144in²

Similarly,

If 1 inch = 2.54 cm

1in² = (2.54)²cm²

1in² = 6.4516cm²

Applying these formulas for the conversion:

Hence the conversion of 82.7 ft² to cm² is 76,830.81 cm²

Answer:

0.105 M

Explanation:

First we convert 25.3 grams of sucrose into moles, using sucrose's molar mass:

Now we calculate the molarity of the solution, using the given volume and the calculated number of moles:

Physical properties

Isomer M.P. (°C) B.P. (°C)

n-hexane −95.3 68.7

3-methylpentane −118.0 63.3

2-methylpentane (isohexane) −153.7 60.3

2,3-dimethylbutane −128.6 58.0

1 more row

\($${ }_{97}^{345} \mathrm{Bk}$$\)

One or more nuclides are created during nuclear reactions when two atomic nuclei or one atomic nucleus and a subatomic particle collide. Different from the responding nuclei are the nuclides that result from nuclear reactions.

In a nuclear reaction, the total mass and total atomic number remains the same.

Am has an atomic number of 95 . So correct reaction is:-

\(${ }_{95}^{343} \mathrm{Am}+{ }_2^4 \mathrm{He} \rightarrow{ }_Z^A \mathrm{X}+2_0^1 \mathrm{n}$\)

To calculate A:

Total mass on reactant side = total mass on product side

343+4=A+2

A=345

To calculate Z:

Total atomic number on reactant side = total atomic number on product side 95+2=Z+0

Z=97

Hence, the isotopic symbol of unknown element is  \(${ }_{97}^{345} \mathrm{Bk}$\)

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Answer:

which property is least helpful in identifying a sample of matter is (B) VOLUME

Explanation:

volume depend on the amount of substance present and are not useful in the identification of a sample of matter. volume is an extensive property so it is not useful identifying the sample of matter.

Answer:

I dont get it what words are we using bc I see words on the side just it doesn't make any sense

\(\boxed{\sf Density=\dfrac{Mass}{Volume}}\)

\(\\ \sf\longmapsto Mass=Density\times Volume\)

\(\\ \sf\longmapsto Mass=1.5(10)\)

\(\\ \sf\longmapsto Mass=15g\)

Explanation:

Water has relatively strong hydrogen bonds holding the molecules together but CO² has only dispersion forces acting as intermolecular forces. The weaker intermolecular forces explains why CO² is a gas whereas H²O is a liquid at room temperature.

Answer: Water has relatively strong hydrogen bonds holding the molecules together but CO2 has only dispersion forces acting as intermolecular forces. The weaker intermolecular forces explains why CO2 is a gas whereas H2O is a liquid at room temperature.

Explanation: I hope it helps you!

Answer:

A

Explanation:

it has non polar molecule, because it has the equal sharing of electrons, so equal repulsion from all sides. atoms are equally represented.

Answer:

Trigonal planar, non-polar

Explanation:

The haematite is a common iron oxide compound, so from it is extracted the Iron.

Bauxite contains Aluminum in its composition, so the Aluminum is extracted from it.

Explanation:

The molar volume corresponds to the volume occupied by any gas at STP, which is equal to 22.4 L.

So:

22.4 L ---- 1 mol

3.56 L ---- x mol

x = 0.159 moles

To find the molar mass we use the following formula:

molar mass = mass/moles

molar mass = 11.3/0.159

molar mass = 71.1

Answer: 71.1 g/mole

Answer:

However copper ore is a finite resource and it makes sense to conserve ore by recycling. It is cheaper to recycle old copper than to mine and extract new copper.

The moles of ZnCl₂ in 1.5 L of the 0.2 M solution is 0.3 moles.

The moles of ZnCl₂  is present in in 1.5 L of a 0.2 M solution is calculated using the formula below:

Moles of ZnCl₂ = 1.5 x 0.2

Moles of ZnCl₂ = 0.3 moles

In conclusion, the moles of ZnCl₂ in the given volume of solution is determined from the molarity of the solution and the volume of solution.

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Answer:

A water molecule consists of two hydrogen atoms and one oxygen atom. The three atoms make an angle; the H-O-H angle is approximately 104.5 degrees. The center of each hydrogen atom is approximately 0.0957 nm from the center of the oxygen atom.

Explanation:

The number of mole of carbon dioxide, CO₂, produced from the reaction is 26 moles

The balanced equation for the reaction is given below:

2C₄H₁₀(g) + 13O₂(g) → 8CO₂(g) + 10H₂O(l)

From the balanced equation above,

2 moles of C₄H₁₀ reacted to produce 8 moles of CO₂

From the question given, we can see that O₂ is the excess reactant.

Thus, we can determine the number of moles of CO₂ produced from the reaction of 6.5 moles of C₄H₁₀ with excess O₂ by doing the following:

From the balanced equation above,

2 moles of C₄H₁₀ reacted to produce 8 moles of CO₂

Therefore,

6.5 moles of C₄H₁₀ will react to produce = (6.5 × 8) / 2 = 26 moles of CO₂

Thus, the number of moles of CO₂ produced from the reaction is 26 moles

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The branch of chemistry dealing with the physical changes associated with chemical reactions

Answer:

Physical chemistry is the part of chemistry that has to do with the physical structure of compounds, and how they react with other matters and bonds that hold atoms together.

Explanation:

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