What’s the answer!?!!

Answer:

260 g

Explanation:

Data obtained from the question include:

Mole of cobalt (Co) = 4.41 moles

Mass of cobalt (Co) =...?

The mole of a substance is related to its mass according to the following equation:

Mole = mass / Molar mass.

With the above formula, we can obtain the mass of 4.41 moles of cobalt as follow:

Mole of cobalt (Co) = 4.41 moles

Molar mass of cobalt = 59 g/mol

Mass of cobalt (Co) =...?

Mole = mass /Molar

4.41 = mass / 59

Cross multiply

Mass of cobalt = 4.41 × 59

Mass of cobalt = 260 g

Therefore, the mass of 4.41 moles of cobalt is 260 g

Answer: Atoms contain tiny, negatively charged electrons

Explanation: Thomson's experiments with cathode ray tubes helped him to discover the electron (which Dalton did not know about). Dalton thought that atoms were indivisible particles, and Thomson's discovery of the electron proved the existence of subatomic particles.

Water does  not stick to the leaves of the plant  owing to the fact that the leaves has a waterproof cuticle.

We know that the leaves are the parts of the plant that are involved in photosynthesis. Photosynthesis is the process by which green plants produce their own food in the presence of sunlight and chlorophyll. We know that the leave has an outer protective covering.

The tissue that plays this outer covering of a plant for is the  epidermis and its waxy cuticle. It prevents damage to the plant.

Water does  not stick to the leaves of the plant  owing to the fact that the leaves has a waterproof cuticle.

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Using significant figures and rounding up, the resulting mass is 80.5 g.

When using addition or subtraction, the total number of significant figures is relevant. Instead, the last significant figure of every number is considered.

In 30.05, the last significant figure is 5, and it is in the hundredths. In 50.0, the last significant figure is 0, and it is in the tenths. Finally, in 0.4006, the last significant figure is 6, and it is in the ten thousandths. Of the three, the 0 from 50.0 is in the "highest" position, and so the last significant figure of the results should also be in the tenths.

If we add the numbers up, we get:

30.05 g + 50.0 g + 0.4006 = 80.4506 g

Because the last significant figure should be in the tenths, we are going to round up 4 to 5, because trailing numbers are greater than 0, so the final mass will be 80.5 g.

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Answer:

the answer is magnesium

Explanation:

Explanation:

K = °C + 273

1. -234 + 273 = 39K

2. 84 + 273 = 357K

3. 70 + 273 = 343K

4. -24 + 273 = 249K

5. 134 + 273 = 407K

6. 120 + 273 = 393K

-234 °C = 39K

84 °C = 357K

70 °C = 343K

-24 °C = 249K

134 °C = 407K

120 °C = 393K

Answer:

-234°C = 39K

84°C = 357K

70°C = 343K

-24°C = 249K

134°C = 407K

120°C = 393K

Explanation:

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Answer:

Your answer is correct and perfect.

Answer: A. They were traveling through different types of rocks

Explanation:

the mole fraction of \(CH_4\) in the original mixture is 0.73 =  73%.

Total pressure of the mixture = 0.53 atm

Total pressure of the product gases = 2.2 atm

The combustion equation for \(CH_4\) is given as :

\(CH_4\)(g) + \(2O_2\)(g) -> \(CO_2\)(g) + \(2H_2O\)(g)

We then apply  Dalton's law of partial pressures, and write

Pressure of \(CO_2\) + Pressure of \(H_2O\) = Pressure of product

x + Pressure of \(H_2O\) = Pressure of product

x + Pressure of \(H_2O\) = 2.2 atm

the mole fraction and the partial pressure relationship is :

2x = Pressure of \(H_2O\)

x + 2x = 2.2 atm

3x = 2.2 atm

x = 2.2 atm / 3

x = 0.73

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Answer:

1) high pH is required

2) other ions are precipitated along with the strontium ions

Explanation:

According to the solubility rules all phosphates are insoluble except those of sodium, potassium, and ammonium. This implies that strontium phosphate is insoluble in water. This explains why strontium ions can be precipitated from drinking water supply using phosphate. The main problem with the precipitation of strontium using phosphate is that it usually requires a high pH as the precipitation occurs under very alkaline conditions.

The main reason why the results may not be accurate is that other ions are precipitated along with the strontium such as calcium ions and magnesium ions. This may lead to inaccurate determination of the amount of strontium ions present.

Answer:

Explanation:

The fundamental issue for precipitation of Strontium Phosphate, is that the other metal cations (Calcium, Barium, Iron, and so on.), present in the town water, are likewise encouraged as Phosphate. In this manner, alongside Strontium Phosphate, Phosphates of a few different cations are additionally encouraged. In this way, Strontium Phosphate can't be weighed precisely. This will prompt off base outcomes.  

The response will be Exothermic, if the temperature of response increments.

Answers:

25. Earth's galaxy

26. The asteroid belt

27. Copernicus

28. Ptolemy

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a) Among NaCl, KCl, and LiCl, LiCl would be expected to have the greatest lattice energy. This is because Li+ ion is the smallest among the three, and hence, has the highest charge density. A higher charge density means that the attraction between the cation and the anion in the lattice is stronger, resulting in a greater lattice energy.

b) Na+ and K+ ions have a larger ionic radius than Li+, and hence, can accommodate more water molecules around them. Therefore, NaCl and KCl are expected to have a higher energy of hydration than LiCl.

c) All three ionic compounds are soluble in water. NaCl and KCl are highly soluble, whereas LiCl is moderately soluble in water.

d) An ionic compound can dissolve in water when the energy of hydration of the ions is greater than the lattice energy. The energy of hydration is the energy released when water molecules surround the ions in the solution, breaking the ionic bonds. The lattice energy is the energy required to break the ionic bonds in the solid crystal. Therefore, if the energy of hydration is greater than the lattice energy, the ionic compound will dissolve in water. In other words, the more polar the compound, the more likely it is to dissolve in water.

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Carbon dioxide molecules can absorb and emit infrared radiation, and they are one of the most abundant constituents of Earth's atmosphere.

Thus, the correct options are:d) Are one of the most abundant constituents of Earth's atmospheree) Can move in many ways, thus absorbing and emitting infrared radiation

Carbon dioxide is a trace gas present in the Earth's atmosphere. It's a vital component of Earth's carbon cycle, which helps to regulate Earth's temperature and support life as we know it. Carbon dioxide molecules are one of the most common gases in the atmosphere, accounting for around 0.04% of the Earth's atmosphere.

The greenhouse effect is caused by carbon dioxide, methane, and other greenhouse gases. When the Sun's energy reaches the Earth's surface, it is absorbed and then radiated back into space as infrared radiation. Greenhouse gases absorb this radiation and trap it in the atmosphere, which causes the Earth's temperature to rise and the climate to change.

Carbon dioxide molecules are capable of absorbing and emitting infrared radiation due to their molecular structure, which consists of one carbon atom and two oxygen atoms. This property of carbon dioxide is the main reason it's classified as a greenhouse gas.

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Answer: It’s C for me: To synthesis new DNA

Explanation:

Brainly please

Answer:

The atomic number or proton number of a chemical element is the number of protons found in the nucleus of every atom of that element. The atomic number uniquely identifies a chemical element. It is identical to the charge number of the nucleus

Explanation:

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It is likely that the rest of the rock was broken down into even smaller particles, such as sand or dust.

This process of breaking down rocks into smaller particles is called weathering and can occur due to various factors, such as water, wind, and temperature changes. These small particles have less mass than the original rock and the pebbles, but they still contribute to the overall mass of the material.  Over time, the small particles can be transported by water or wind and deposited in different locations, contributing to the formation of new landforms.

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The mass of water produced if the percent yield of the reaction is 72% is 16.2g.

Mass of acetylene = 40.0 grams

Mass of oxygen = 40.0 grams

Percent yield of the reaction = 72%

The balanced chemical equation is : 2 C2H2(g) + 5 O2(g) → 4 CO2(g) + 2 H2O(g)

From the balanced chemical equation, it is clear that 2 moles of acetylene reacts with 5 moles of oxygen to form 2 moles of water.

To find out limiting reagent

Moles of acetylene = Given mass of acetylene / molar mass of acetylene

                                 = 40.0 g / 26 g/mol = 1.54 moles

Moles of oxygen = Given mass of oxygen / molar mass of oxygen

                                = 40.0 g / 32 g/mol = 1.25 moles

The limiting reactant is oxygen because its number of moles is less than acetylene. Oxygen will react with 1.25 moles of acetylene present and form CO2 and H2O.

According to the balanced equation, the stoichiometric ratio of C2H2 to H2O is 2:2, meaning that for every 2 moles of C2H2, 2 moles of H2O are produced.

Since the stoichiometry is 1:1, the moles of water produced will be the same as the moles of acetylene used.

The number of moles of H2O produced 1.25 moles.

The mass of H2O produced = Number of moles of H2O × Molar mass of H2O

Mass of H2O produced = 1.25 × 18 = 22.5 g

Given percent yield = 72%

The actual yield can be calculated as follows;

Percent yield = Actual yield / Theoretical yield × 100

72% = Actual yield / 22.5 g × 100

Actual yield = 22.5 g× 72 / 100 =16.2 g

Thus, the mass of water produced if the percent yield of the reaction is 72% is 16.2g.

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Answer:

Constant

Explanation:

Trust

\(\\ \sf\longmapsto Momentum=Mass\times Velocity\)

\(\\ \sf\longmapsto Velocity=\dfrac{Momentum}{mass}\)

\(\\ \sf\longmapsto Velocity=\dfrac{18}{10}\)

\(\\ \sf\longmapsto Velocity=1.8m/s\)

Momentum is a property of an object in motion and is calculated by multiplying its mass by its velocity. It's a measure of how difficult it is to stop an object that's moving. the velocity of object B after the collision is 1.8 meters per second.

To calculate the velocity of object B after the collision, we can use the formula for momentum:

Momentum (p) = Mass (m) × Velocity (v)

Given the momentum after the collision (p = 18 kg m/s) and the mass of object B (m = 10 kg), we can rearrange the formula to solve for velocity (v):

Velocity (v) = Momentum (p) / Mass (m)

Substitute the given values:

v = 18 kg m/s / 10 kg

v = 1.8 m/s

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Answer and Explanation: Many nuclei are radioactive, which means they emit particles to become stable. In the process, they also become a different element. There are 3 types of decay:

Problem #1:

1.) Astatine: Z = 85 and  A = 211

Alpha decay: \({{A=211} \atop {Z=85}} \right. At\) ⇒ \({{207} \atop {83}} \right. Bi + {{4} \atop {2}} \right. \alpha\)

The isotope created is Bismuth

Characteristics: Z = 83; e⁻ = 83; n = A - Z = 207 - 83 = 124

The isotope is Bismuth with 83 protons, 83 electrons and 124 neutrons.

Problem #2

1.) Lead: Z = 82 and A = 82

Beta decay: \({{209} \atop {82}} \right. Pb\) ⇒ \({{209} \atop {81}} \right. Tl+{{0} \atop {-1}} \right. \beta\)

The isotope created is talium.

2.) \({{209} \atop {82}} \right. Pb\) ⇒ \({{209} \atop {81}} \right. Tl+{{0} \atop {-1}} \right. \beta\)

\({{209} \atop {81}} \right. Tl\) ⇒ \({{205} \atop {79}} \right. Au+{{4} \atop {2}} \right. \alpha\)

\({{205} \atop {79}} \right. Au\) ⇒ \({{205} \atop {78}} \right. Pt+{{0} \atop {-1}} \right. \beta\)

3.) The isotope created is \({{205} \atop {78}} \right. Pt\).

p⁺ = 78; e⁻ = 78; n = 127

The isotope created ahs 78 protons, 78 electrons and 127 neutrons.

Answer:

Yes, the increase in pressure of the refrigerant can be related to the increase in temperature. This is because when a gas is compressed, the molecules are forced closer together, which increases the temperature of the gas. This is known as the ideal gas law, which states that when pressure increases, temperature also increases.

At the end of the citric acid cycle, most of the energy that was contained in the chemical bonds of glucose is in reduced electron carriers. These reduced electron carriers, such as NADH and FADH2, carry high-energy.

The citric acid cycle, also known as the Krebs cycle or tricarboxylic acid (TCA) cycle, is a series of chemical reactions that occur in the mitochondria of cells. It is a central metabolic pathway that plays a crucial role in the oxidative metabolism of glucose and other molecules to generate energy. The citric acid cycle starts with the entry of acetyl-CoA, which is derived from the breakdown of carbohydrates, fats, and proteins. Acetyl-CoA combines with a four-carbon molecule called oxaloacetate to form citrate, also known as citric acid. The citric acid then undergoes a series of enzyme-catalyzed reactions, resulting in the release of carbon dioxide (CO2).

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1. To determine the amount of morphine in the bloodstream after 18 hours, we need to use the formula y = A₀(1/2)^(t/h), where:

Now substitute the values in the formula; y = 6(1/2)^(18/9) = 6(1/2)^2 = 6(1/4) = 1.5mgTherefore, the amount of morphine in the bloodstream after 18 hours is 1.5mg.

2. To determine when the amount of morphine drops to 0.75mg, we will also use the formula y = A₀(1/2)^(t/h)Rearranging the formula t = hlog₂(y/A₀)where;

The Bloodstream is an organ system whose function is to move substances to and from cells. This system ensures the survival of organisms. So, in other words, this system has a very vital role in the body. “The circulatory system consists of three types of blood vessels, namely arteries, veins and capillaries. All three have their own characteristics and functions to circulate blood rich in oxygen and nutrients throughout the body.

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The sample prepared by dissolving 10.0 grams of NaCl in 1.0 liter of H₂O is a homogeneous mixture, which is described by option (2).

A homogeneous mixture is a mixture that has a uniform composition and properties throughout the sample. In this case, the NaCl molecules have been completely dissolved in the water molecules, resulting in a clear, colorless solution.

The NaCl and water molecules are distributed evenly throughout the sample, and the composition and properties of the solution are uniform in all parts of the sample. As a result, the sample is a homogeneous mixture.

Option (1) cannot be correct because NaCl and H₂O are two distinct compounds that have different properties and characteristics. Therefore, they cannot form a single homogeneous compound.

Option (3) cannot be correct because a compound is a substance composed of two or more different elements that are chemically combined in a fixed ratio. NaCl is a compound, but H₂O is also a compound, and they cannot chemically combine to form a heterogeneous compound.

Option (4) cannot be correct because a heterogeneous mixture is a mixture that is not uniform in composition and properties throughout the sample. This is not the case for the NaCl and H₂O solution, which is a homogeneous mixture.

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The pH scale measures the acidity or basicity of a substance. A pH of 5 is one unit lower than a pH of 6, which means that a substance with a pH of 5 is ten times more acidic than a substance with a pH of 6.

This is because the pH scale is logarithmic, which means that a change of one unit on the scale represents a tenfold change in acidity or basicity. To understand this better, consider the example of lemon juice and orange juice. Lemon juice has a pH of around 2, making it highly acidic, while orange juice has a pH of around 4, making it less acidic than lemon juice but still acidic nonetheless. The difference in pH between these two juices is two units, which means that lemon juice is 100 times more acidic than orange juice. In summary, a substance with a pH of 5 is ten times more acidic than a substance with a pH of 6.

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Ba(OH)2 has one barium (Ba) atom, two hydroxide (OH) groups, and one oxygen (O) atom. So, the total number of atoms in one molecule of Ba(OH)2 would be:

1 Ba atom + 2 O atoms + 2 H atoms = 5 atoms

To find the number of molecules of Ba(OH)2 from 4.81*10^25 total atoms, we can use the Avogadro's number which states that 1 mole of any substance contains 6.022 x 10^23 particles. So,

1 mole Ba(OH)2 = 5 x 6.022 x 10^23 molecules Ba(OH)2

To find the number of moles of Ba(OH)2, we can divide the total number of atoms by the number of atoms in one molecule:

4.81 x 10^25 atoms / 5 atoms/molecule = 9.62 x 10^24 molecules of Ba(OH)2

Therefore, 9.62 x 10^24 molecules of Ba(OH)2 would be made from 4.81*10^25 total atoms.

Answer:

Quantitative and Qualitative :)

Explanation:

Answer:
To calculate the number of atoms of H and C in 0.160 mol of C6H14O, we need to first determine the number of moles of each element present in C6H14O.

The molecular formula of C6H14O shows that there are 6 carbon atoms, 14 hydrogen atoms, and 1 oxygen atom in each molecule of C6H14O.

The molar mass of C6H14O can be calculated as:

Molar mass of C6H14O = (6 × atomic mass of C) + (14 × atomic mass of H) + (1 × atomic mass of O)

= (6 × 12.01 g/mol) + (14 × 1.01 g/mol) + (1 × 16.00 g/mol)

= 86.18 g/mol

Therefore, 0.160 mol of C6H14O has a mass of:

Mass = molar mass × number of moles

= 86.18 g/mol × 0.160 mol

= 13.79 g

Now we can calculate the number of atoms of H and C in 0.160 mol of C6H14O.

Number of atoms of H:

Number of moles of H = 14 × 0.160 mol = 2.24 mol

Number of atoms of H = 2.24 mol × Avogadro's number

= 2.24 mol × 6.022 × 10^23/mol

= 1.35 × 10^24 atoms of H

Therefore, there are 1.35 × 10^24 atoms of hydrogen in 0.160 mol of C6H14O.

Number of atoms of C:

Number of moles of C = 6 × 0.160 mol = 0.96 mol

Number of atoms of C = 0.96 mol × Avogadro's number

= 0.96 mol × 6.022 × 10^23/mol

= 5.78 × 10^23 atoms of C

Therefore, there are 5.78 × 10^23 atoms of carbon in 0.160 mol of C6H14O.

Explanation:

pH of given buffer solution prepared by dissolving 0.20 mole of cyanic acid is 4.30.

Solution:

Equilibrium reaction equation for the given reaction is as follows. HCNO(aq) + H2O(l) → CNO (aq) + H₂O* (aq)

It is given that initial moles of HCNO is 0.20 mol and for NaCNO is 0.80 mol.

Ka of HCNO Is 2 x 10^-4 mol.

Now, we will assume that at equilibrium there are x moles.

HCNO(aq) + H2O(l) → CNO (aq) + H₂O+ (aq)

Initial:          0.20            0.80            0

Change:        -x                +x             +x

Equilibrium: 0.20-x       0.80 + x       x

As the volume of the given solution is 1 liter, equilibrium concentration and moles are same.

Ka = [CNO-][H30+]/[HCNO]

2.0x 10^-4 = x(0.80 + x) / (0.20 - x)

x = 5.0x10^-5 M

Then, pH = -log[H30+]

= -log(5.0 × 10^-5)

= 4.30

pH of given buffer solution is 4.30.

A weak acid and either its conjugate base or the base itself are combined in an aqueous solution to form a buffer solution. The pH scarcely changes at all when a small amount of a strong acid or basic is added to it.

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A maximum of two electrons will be placed in 1s first. With a maximum of two electrons, 2s will then be filled. With a maximum of 6 electrons, 2p will then be filled.

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