Methane (CH4) and the perchlorate ion (ClO4â) are both described as tetrahedral. Methane and the perchlorate ion are both described as tetrahedral. What does this indicate about their bond angles?

a. Bond angles in the methane molecule are greater than those in the perchlorate ion.
b. Bond angles in the perchlorate ion are greater than those in the methane molecule.
c. Bond angles in the methane molecule and in the perchlorate ion are approximately equal

No rock candy will be formed, as the solution is already at its maximum saturation point at 20°C.

We can calculate the maximum amount of sucrose that can be dissolved in 1000.0 g of water at this temperature as follows:

The maximum amount of sucrose that can be dissolved = \((230.9 g/100 mL) * (1000.0 mL/1000.0 g) = 2.309 g/g\)

This means that the maximum mass of sucrose that can be dissolved in 1000.0 g of water at 20°C is 2.309 g.

Mass of rock candy = Initial mass of sucrose - Mass of sucrose in solution at 20°C

Therefore, the mass of rock candy that will be formed is:

Mass of rock candy = Initial mass of sucrose - Mass of sucrose in solution at 20°C

\(= 2.309 g - 2.309 g/g * 1.000 kg \\= 0.0 g\)

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The two atoms are isotopes of each other are Si with a mass number of 27 and an atomic number 14, and Mg with a mass number of 25 and an atomic number of 12. The correct option is A.

Isotopes are atoms with the same number of protons but differing numbers of neutrons.

They differ in mass, which affects their physical characteristics even if they have nearly identical chemical properties.

An isotope is one of two or more chemical elements that exist in different forms. Varied isotopes of an element share the same atomic number and protons in their nuclei, giving them the same atomic weight.

However, each elemental isotope has a different amount of neutrons, which changes its atomic weight.

They can be referred to as isotopes because Si, which has a mass number of 27 and an atomic number of 14, and Mg, which has a mass number of 25 and an atomic number of 12, both have 13 protons.

Thus, the correct option is A.

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Answer: metal turn orange and weaker as it gets oxidised

Explanation:

The wavelength of the green light radiation that has a frequency of 6.26 x 10¹⁴ Hz is 4.8 x 10⁻⁷.

Given data :

As, c = ∧ v

So, ∧ = c / v

    ∧ = 3.00 x 10⁸ / 6.26 x 10¹⁴

    ∧ = 4.8 x 10⁻⁷    

Thus, the wavelength of the green light radiation that has a frequency of 6.26 x 10¹⁴ Hz is 4.8 x 10⁻⁷.

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Answer:

Normal boiling point is a standard boiling point at sea level highet that is 100 c°

but the temperature at which water boils may vary with different factors like increasing pressure in pressure cooker.

And it decreases with increase in height.

Explanation:

The boiling point of a liquid is the temperature at which its vapor pressure is equal to the pressure of the gas above it. The normal boiling point of a liquid is the temperature at which its vapor pressure is equal to one atmosphere (760 torr).

Normal boiling point is a standard unit  and the highest is 100 c°  at sea level but the temperature at which water boils and the temperature may vary with respect to different factors.  

The boiling point is defined as the temperature at which the liquid vapor pressure is equal to the external pressure surrounding the liquid.

The boiling point of a liquid depend on atmospheric pressure.

When external pressure is reduced, the boiling point will be lowered. For example at sea level the boiling point of water is 100 C  but when we go to 6,600 feet the boiling point become 93.4 C

The standard boiling point is defines  as the temperature of boiling under 1 bar of pressure.

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The density (in g/cm³) of a cube of metal that is 2 inches on a side and weighs 444.5 grams is 3.4 g/cm³ (1st option)

First, we shall obtain the volume of the metal. Details below:

Volume = L³

Volume = 5.08³

Volume = 131.1 cm³

Finally, we shall obtain the density of the metal. Details below:

Density = mass / volume

Density of metal = 444.5 / 131.1

Density of metal = 3.4 g/cm³

Thus, we can conclude from the above calculation that the density of the metal is 3.4 g/cm³ (1st option)

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Complete question:

What is the density (in g/cm³) of a cube of metal that is 2 inches on a side and weighs 444.5 grams?

3.4 g/cm³

8.89 g/cm³

55.56 g/cm³

0.180 g/cm³

dolphin and whales use echolocation

The IUPAC name for the compound shown is 3-ethyl-2,2-dimethylpentane.

International Union of Pure and Applied Chemistry is referred to as IUPAC. The terminology for naming organic compounds has been provided by IUPAC. The root name, prefix, and suffix are the three components that make up an IUPAC name.

There are five carbon atoms in the longest chain. Consequently, pent is the structure's root name. Choose the longest chain where the substituents are represented by the fewest numbers.

On the longest chain, three substituents are present. It consists of one ethyl group and two methyl groups. One ethyl group and two methyl groups are substituted at C-2 and C-3, respectively. Therefore, 3-ethyl-2,2-dimethyl will be the prefix. Alkane makes up the functional group. Therefore, the suffix is ane.

This ends up naming the compound as 3-ethyl-2,2-dimethylpentane.

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The question asked by the Mr. Bakewell should be "Is there any way to increase the milk production of the cattle.

Invention of selective breeding in the 1700’s.

He took over the family farm and started developing novel breeding methods. He kept his male and female cattle apart, in contrast to his contemporaries, to avoid accidental breeding. He created a "in-and-in" technique in which individuals with undesirable traits were excluded from breeding populations and good traits were amplified through inbreeding. He also invented the widespread practice of using animals for breeding.

Among the traditional livestock of Leicestershire, England, is the Leicester ram.

One of the first farmers, Bakewell, bred both sheep and cattle for meat rather than only for work or wool. He created the Leicestershire longhorn cattle, which produced good meat but not great milk, and which later gave way to the shorthorns developed by his trainee Charles Colling. A barrel-shaped sheep with long coarse wool and a good supply of high-quality, fatty meat was also developed by Bakewell. However, these sheep later lost favour due to changes in meat preferences.

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Answer:

The correct answer is 16.61 grams methanol and 57.38 grams water.

Explanation:

The mole fraction (X) of methanol can be determined by using the formula,  

X₁ = mole number of methanol (n₁) / Total mole number (n₁ + n₂)

X₁ = n₁/n₁ + n₂ = 0.14

n₁ / n₁ + n₂ = 0.14 ---------(i)

n₁ mole CH₃OH = n₁ mol × 32.042 gram/mol (The molecular mass of CH₃OH is 32.042 grams per mole)

n₁ mole CH₃OH = 32.042 n₁ g

n₂ mole H2O = n₂ mole × 18.015 g/mol  

n₂ mole H2O = 18.015 n₂ g

Thus, total mole number is,  

32.042 n₁ + 18.015 n₂ = 74 ------------(ii)

From equation (i)

n₁/n₁ + n₂ = 0.14

n₁ = 0.14 n₁ + 0.14 n₂

n₁ - 0.14 n₁ = 0.14 n₂

n₁ = 0.14 n₂ / 1-0.14

n₁ = 0.14 n₂/0.86 ----------(iii)

From eq (ii) and (iii) we get,  

32.042 × 0.14/0.86 n₂ + 18.015 n₂ = 74

n₂ (32.042 × 0.14/0.86 + 18.015) = 74

n₂ = 74 / (32.042 × 0.14/0.86 + 18.0.15)

n₂ = 3.1854 mol

From equation (iii),  

n₁ = 0.14/0.86 n₂

n₁ = 0.14/0.86 × 3.1854

n₁ = 0.5185 mol

Now, presence of water in the mixture is,  

= 3.1854 mole × 18.015 gram per mole  

= 57.38 grams

Methanol present in the mixture is,  

= 0.5185 mol × 32.042 gram per mole

= 16.61 grams

The grams of iburofen does such a tablet contain 800 mg =   0.8g Ibuprofen

1 g = 10^-3g = .001g

Ibuprofen has  800 mg doses in over-the-counter analgesic

800g = 800 × .001

        = 0.8g

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Answer:

A ---->gamma ray

Explanation:

Gamma rays have the highest frequencies among all electromagnetic waves and therefore have the shortest wavelengths.

Answer:

answer is the third option

In 1 mole of calcium carbonate, there are approximately 18.066 x 10^23 moles of oxygen.

To determine the number of moles of oxygen (O) in 1 mole of calcium carbonate (CaCO3), we need to examine the chemical formula of calcium carbonate and identify the number of oxygen atoms present.

The chemical formula of calcium carbonate is CaCO3. In this formula, we have one calcium atom (Ca), one carbon atom (C), and three oxygen atoms (O).

The subscript numbers in the formula indicate the number of atoms for each element. Therefore, we have:

1 calcium atom (Ca)

1 carbon atom (C)

3 oxygen atoms (O)

To calculate the number of moles of oxygen in 1 mole of calcium carbonate, we multiply the number of oxygen atoms (3) by the Avogadro's number, which is approximately 6.022 x 10^23 molecules/mol.

Number of moles of oxygen (O) in 1 mole of calcium carbonate (CaCO3) = 3 moles of oxygen x (6.022 x 10^23 molecules/mol)

Calculating this value, we find:

Number of moles of oxygen (O) in 1 mole of calcium carbonate (CaCO3) ≈ 18.066 x 10^23 moles of oxygen

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Answer

D both A and B

Answer:

Explanation:

In distillation, q is defined as the moles of liquid flow in the stripping section per mole of feed introduced. The values of q for saturated liquid feed and for saturated vapor feed are 0 and infinity, respectively.

the answer is that it is a

Nuclear Fission

Nuclear fission, subdivision of a heavy atomic nucleus, such as that of uranium or plutonium, into two fragments of roughly equal mass. The process is accompanied by the release of a large amount of energy. In nuclear fission the nucleus of an atom breaks up into two lighter nuclei.

Nuclear fission is a process where the nucleus of an atom is split into two or more smaller nuclei, known as fission products. The fission of heavy elements is an exothermic reaction, and huge amounts of energy are released in the process.

Marlon can conclude that the cell belongs to the Kingdom Protista if he observes that the paramecium has a nucleus.

The presence of a nucleus is a characteristic feature of eukaryotic cells, which are found in Protists, Fungi, Plants, and Animals. Therefore, if Marlon observes that the paramecium has a nucleus, he can conclude that the cell belongs to the Kingdom Protista, which includes unicellular eukaryotic organisms.

The presence of a nucleus is one of the defining features of eukaryotic cells, which are found in Protists, Fungi, Plants, and Animals. The Protista Kingdom includes unicellular organisms that have a nucleus and other membrane-bound organelles.

However, he would need to observe other features of the cell to further classify it into a specific group or species within the Protista Kingdom.

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Answer:

4 millllllermeeters jb

The relative atomic mass of Calcium : 40 g/mol

The mole is the number of particles contained in a substance

1 mol = 6.02.10²³

Moles can also be determined from the amount of substance mass and its molar mass / the relative atomic mass(Ar) :

\(\tt mol(n)=\dfrac{mass(m)}{Ar}\)

Calcium (Ca) :  

moles = 0.4

mass = 16 g

\(\tt Ar=\dfrac{mass}{mol}=\dfrac{16}{0.4}=40~g/mol\)

The formatted answer to the question is below.Energy required to boil hexane is 80kj

From the question, the parameters given are 64.7g of hexane,C6H14; a starting temperature of 41.9°C and bringing it to 33.2°C.

Molar mass of hexane,C6H14=86.18g/mol.

Things to know: heat capacity of hexane, C6H14= 142.6J/molK, the heat of fusion = 9.87 kj/mol.

STEP ONE(1): ENERGY USED IN MELTING HEXANE SOLID.

Using the formula below;

Energy used in melting the solid(in JOULES) = (mass of hexane/molar mass of hexane) × heat of Fusion.

=(64.7g of C6H14/86.18(g per mol) of C6H6) × 9.87 kJ per mol.

= 7.40J.

= 0.0074 kJ.

STEP TWO (2): ENERGY OF HEATING THE LIQUID.

It can be calculated from the formula below;

Energy= heat capacity (J/g.K) × mass of hexane× (∆T).

= 142.6J/molK × 64.7× (41.9-33.2).

= 80268.114

= 80.268 kJ.

Energy required to boil hexane= Energy required to melt the hexane + energy required for boiling.

= 0.0074 kJ.+80.268 kJ.

= 80.27kJ

Approximately, 80kJ

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Answer:

The final pressure is 90.1 atm.

Explanation:

Assuming constant temperature, we can solve this problem by using Boyle's Law, which states:

Where in this case:

We input the given data:

And solve for P₂:

The final pressure is 90.1 atm.

Structural isomers are molecules with the same molecular formula but with different structural formulae. This means that they have the same number and types of atoms, but they are arranged differently. The following two organic compounds are structural isomers of each other.

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The current passing through the electrolytic cell is approximately 2.02 x 10^4 Amperes.

To calculate the current in amperes, we need to use Faraday's laws of electrolysis and the stoichiometry of the reaction.

Faraday's laws state that the amount of substance produced or consumed during electrolysis is directly proportional to the quantity of electricity passed through the cell. The relationship is given by:

Q = nF

Where Q is the electric charge in coulombs (C), n is the number of moles of substance involved in the reaction, and F is Faraday's constant, which is equal to 96,485 C/mol.

In this case, the substance being produced is Cl2, and we know the mass of Cl2 produced, which is 4.8 x 10^5 g.

First, we need to calculate the number of moles of Cl2 produced:

Molar mass of Cl2 = 35.45 g/mol

Moles of Cl2 = mass / molar mass = (4.8 x 10^5 g) / (35.45 g/mol) ≈ 1.354 x 10^4 mol

Now we can calculate the quantity of electricity passed through the cell using Faraday's laws:

Q = nF

Q = (\(1.354 x 10^4\)mol) * (96,485 C/mol)

Q ≈ 1.308 x 10^9 C

The quantity of electricity is given in coulombs. To find the current, we need to divide this value by the time in seconds.

Given that the time is 18 hours, we convert it to seconds:

Time = 18 hours * 60 minutes/hour * 60 seconds/minute

Time = 6.48 x 10^4 seconds

Finally, we can calculate the current:

Current (I) = Q / Time

I = (1.308 x 10^9 C) / (6.48 x 10^4 s)

I ≈ 2.02 x 10^4 Amperes

Therefore, the current passing through the electrolytic cell is approximately 2.02 x 10^4 Amperes.

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A certain protein was found to contain 0.793% zinc by mass. The minimum molecular mass of the protein is 8264.46 grams.

Molecular mass is the sum of the all atoms of an element. The molecular mass can be calculated by checking the mass of the atom from the periodic table.

In 100 grams of proteins, we have, 0.793% zinc

The molar mass of zinc is 65.3820 g/mol

0.793 / 65.3820 = 0.0121 moles of zinc

So, in 100 grams of protein

1 mole = 100 / 0.0121 = 8264.46 grams / mol

Thus, the minimum molecular mass of the protein is 8264.46 grams.

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Answer:

Explanation:

The information below explains how dehydration of alcohol occurs to produce alkene.

Under the influence of a catalyst, alcohol dehydrates to produce an alkene and water. To produce alkene and water, the reaction eliminates the OH group from alcohol containing the carbon atom and the hydrogen atom from a neighboring carbon atom via the same molecule.

The –OH group in alcohol contribute two(2) electrons to H+ out from the acid reagent, resulting in the formation of an alkyloxonium ion. This ion serves as an excellent leaving group, allowing a carbocation to form. The nucleophile which acts as the deprotonated acid subsequently attacks and creates a double bond with the hydrogen next to the carbocation.