When 1 mole of tin IV oxide is heated with 2 moles of hydrogen gas, 1 mole of tin metal and 2 moles of water vapor are generated. SnO2 + 2H2 → Sn + 2H2O How many moles of tin metal will be produced when 0.74 moles of tin IV oxide is heated?

Silicon dioxide (SiO₂), also known as silica, is a non-polar molecule.

A non-polar molecule is a molecule that has an even distribution of electrical charge, meaning it does not have a positive or negative end.

The molecule's geometry and symmetry lead to its non-polar nature. SiO₂ consists of one silicon atom bonded to two oxygen atoms, forming a linear structure. The oxygen atoms are positioned on opposite sides of the silicon atom, resulting in a symmetric arrangement.

As a result, the bond dipoles cancel each other out, resulting in a non-polar molecule overall.

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The best tool for Derek to use for delivering 25.00 mL of a sodium hydroxide solution is a volumetric pipette. Volumetric pipettes ensure precise volume measurements needed in laboratory settings.

To accurately measure and deliver 25.00 mL of a sodium hydroxide solution, the best tool for Derek to use is a volumetric pipette. Volumetric pipettes are specifically designed for precise volume measurements and are commonly used in laboratory settings to ensure accuracy.

Here’s a step-by-step guide on how Derek can use the volumetric pipette:

By using a volumetric pipette, Derek can be confident that he has delivered exactly 25.00 mL of the sodium hydroxide solution, which is critical for accurate chemical preparations and reactions.

To find the molecular formula of a compound, one must first determine the empirical formula based on mass percentages, calculate the molar mass using the ideal gas law, and then compare the empirical formula mass with the molar mass.

To establish the molecular formula for the gaseous compound, we start by calculating its empirical formula using the percentages given: 82.66% carbon (C) and 17.34% hydrogen (H). With the assumption of a 100 g sample, we have 82.66 g of C and 17.34 g of H. Converting these masses to moles, we use the atomic mass of carbon (12.01 g/mol) and hydrogen (1.01 g/mol), yielding:

The empirical formula is obtained by dividing by the smaller number of moles:

Since we cannot have half a hydrogen in a formula, we multiply by 2 to get whole numbers, giving us an empirical formula of C2H5. Next, we calculate the molar mass (MM) using the provided conditions (158 mL at 556 mmHg and 25
C with a mass of 0.275 g). We apply the ideal gas law:

PV = nRT

Converting the pressure to atmospheres (556 mmHg / 760 mmHg/atm) and the volume to liters (158 mL / 1000 mL/L), and using the value of R (0.0821 Latm/molk), the molar mass can be calculated. Finally, comparing the empirical formula mass (EM) to the MM obtained allows for the determination of the molecular formula by finding the ratio between MM and EM, which tells us how many empirical units are in the molecular formula.

To summarize:

Explanation:

When the water freezes, the variable which changes is the temperature because as we reduce the temperature, the particles will come closer to each other and the average kinetic energy of the particles of water decreases. Hence, the water freezes below 0°C.

In the case of melting, the temperature is increased which means that the particles move away from each other and the average kinetic energy of the particles of water at this temperature increases. Hence, the water melts above 100°C.

Answer:

This is the evidence of physical change.

Explanation:

When the substance is heated, its form is changed but identity remain the same, it is then a physical change. In physical change substance can only change their phases but not lose the identity. For example it may change its state from solid to liquid and liquid to gas.

Physical change:

The changes that occur only due to change in shape or form but their chemical or internal composition remain unchanged.

These changes were reversible.

They have same chemical property.

These changes can be observed with naked eye.

Example s:

Water converting to Ice .

Water converting to gas.

In this water molecule remain the same only they rearrange themselves that change its state of mater not composition.

Chemical change:

The changes, that occur due to change in the composition of a substance and result in a different compound is known as chemical change.

These changes are irreversible .

These changes occur due to chemical reactions .

These may not be observed with naked eye .

Examples:

combustion of fuel or wood: that oil or wood convert into energy, CO2 and ash in case of wood .

Boiling of egg: that change the chemical composition of protein in the egg

atoms are made of 3 types of sub atomic particles; electrons, protons and neutrons

Of these particles, electrons are involved in the chemical reactions.

Therefore chemical properties of the element are determined by the electrons, and that too mostly the valence electrons. Valence electrons are the electrons in the outermost energy shell.

Atoms with same number of valence electrons have similar chemical properties. atoms having same number of valence electrons are classified into groups.

So elements of the same group have same number of valence electrons, hence similar chemical properties

Ca has 2 valence electrons so it belongs to group 2. Of the given elements

only Mg belongs to group 2. Therefore Mg has the most common properties with Ca

Final answer:

To calculate the number of atoms in 4.2 moles of sulfur atoms, use Avogadro's number. To calculate the mass of these 4.2 moles, multiply the number of moles by the molar mass of sulfur.

Explanation:

To calculate the number of atoms in 4.2 moles of sulfur atoms, you can use Avogadro's number. Avogadro's number is equal to 6.022 x 10^23 atoms per mole. So, by multiplying the number of moles (4.2) by Avogadro's number, you can determine the number of atoms:

Number of atoms = 4.2 moles * (6.022 x 10^23 atoms/mole) = 2.53 x 10^24 atoms.

To calculate the mass of 4.2 moles of sulfur atoms, you need to know the molar mass of sulfur. The molar mass of sulfur is 32.07 g/mol. Multiply the number of moles by the molar mass to find the mass:

Mass = 4.2 moles * 32.07 g/mol = 134.754 g.

In the given question, Gamma rays consist of pure energy. The correct answer is option B.

Gamma rays are electromagnetic radiation with very high frequency and short wavelength.

They have no mass or charge, and are not considered particles like electrons, protons, or beta particles. Gamma rays are produced by the decay of atomic nuclei and are often associated with nuclear reactions such as those that occur in the sun, in nuclear power plants, or in nuclear weapons.

Therefore, Gamma rays are option B. "pure energy" in the form of electromagnetic radiation with an extremely high frequency and short wavelength.

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Iridium (Ir) is a element which is metal. Therefore, the correct option is option C among all the given options.

Metal is any of a group of substances with strong thermal and electrical conductivity, malleability, ductility, as well as high light reflection. Typically, metals are crystalline solids. The free-electron hypothesis provides the best justification for the high thermal and electrical conductivity and high of the simple elements.

They typically have a very straightforward crystal structure that is characterized by dense atom packing and a high level of symmetry. Metal atoms often have fewer than half of their total number of electrons in the outermost shell. This property makes metals less likely to combine to create compounds. Iridium (Ir) is a element which is metal.

Therefore, the correct option is option C. Iridium (Ir) is a element which is metal.

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The moles of [tex]\rm Cl_2[/tex] needed to have stoichiometrically equivalent amounts of Na and [tex]\rm Cl_2[/tex] is 1.5 moles.

Stoichiometrically equivalent is defined as a definite quantity of one substances reacted with the definite quantity of other substances represented in the equation.  

It can also be defined as the relationship between the quantities of reactant and product before, during and following equation.

The ratio of [tex]\rm NaCl_2[/tex] is 1:2 because in [tex]\rm NaCl_2[/tex] there is only one mole Na ion is present and 2 mole of Cl ion is present.

Thus moles of Na present = 3 moles

So, 2 / 1 = 3 / x

     x = 3 / 2

     x = 1.5 moles

Thus, the moles of [tex]\rm Cl_2[/tex]needed to have stoichiometrically equivalent amounts of Na and[tex]\rm Cl_2[/tex] is 1.5 moles.

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Option C: The dissociation of a polar covalent compound in water.

Sugar is made up of sucrose molecules containing polar covalent bonds. They have same type of oxygen-hydrogen covalent bonds that are present in water.

Since, sugar is not an ionic compound, option a and option b are incorrect. Also, due to same type of bonding in water and sugar molecules there will be no such force of attraction between them, this will opt out the option d.

Thus, dissolution of sugar in water is the dissociation of a polar covalent compound in water and option c is correct.

Final answer:

The dissolution of sugar in water is due to the strong pull of water molecules on a polar covalent compound, like sugar, and is best explained by option d.

Explanation:

The dissolution of sugar in water is best described by option d, a strong pull of water molecules on a polar covalent compound. Sugar molecules are classified as polar covalent compounds because they contain regions of hydrogen-oxygen polar bonds. Due to the polarity of the water molecule, it can interact with these polar regions within sugar molecules through intermolecular forces. These interactions facilitate the separation of the sugar molecules into the solution, where they are surrounded by water molecules, leading to dissolution.

Water itself is a polar molecule, having a partial negative charge on the oxygen atom and a partial positive charge on the hydrogen atoms. Water molecules can surround the sugar molecules, aligning their charges with the opposite charges in the sugar molecule. This is what strongly pulls the sugar molecules apart and allows them to interact with more water molecules until they are evenly dispersed — thus the sugar is dissolved in the water due to the hydration process.

Answer:

A) CHCl3

Explanation:

Polarity arises due to the difference in the electronegativity between two atoms forming a chemical bond. This difference also creates a dipole. A molecule is said to be polar if it has a net dipole moment. In symmteric molecules the dipole moments tend to cancel out making them non-polar.

A) CHCl3 is a tetrahedral molecule in which the central C atom is bonded to 3 Cl and 1 H atom. This molecule is not symmteric since there are 3 C-Cl and  C-H bonds. Therefore, it will have a net dipole and will be polar

B) CCl4 is also a tetrahedral molecule, but symmetric in nature. Hence it will be non-polar

C) CO2 is a linear molecule where the dipole moments cancel out making it non-polar

C) CH4 is also a tetrahedral molecule and symmetric in nature. Hence it will be non-polar

A. CHCl₃ (chloroform) is the polar compound due to its tetrahedral structure with non-identical atoms and the resulting imbalance in electron distribution.

The compound likely to be a polar compound is CHCl₃. CHCl₃, or chloroform, is a polar molecule due to the uneven distribution of charge within its tetrahedral structure. Although the molecule has a tetrahedral geometry, the atoms bonded to the central carbon are not identical; there is one hydrogen and three chlorine atoms. Chlorine is more electronegative than carbon, and carbon is more electronegative than hydrogen, resulting in polar C-Cl bonds with a larger bond moment compared to the C-H bond. The difference in electronegativity and the arrangement of the atoms causes the bond dipole moments not to cancel out, yielding an overall dipole moment for the molecule. In contrast, molecules such as CCl₄ and CO₂ have symmetrical shapes and equal sharing of electrons, which result in nonpolar characteristics, while CH₄ also has a symmetrical tetrahedral structure with no significant differences in the electronegativity of the bonded atoms, rendering it nonpolar as well.

The mass of platinum taken here is 338.9 g. The mass of one mole of platinum is 195 g. Then , number of moles in 338.9 g is 1.73.

Platinum is 78th element in periodic table. It is a transition metal in d -block. Platinum is a precious metal used in making of ornaments, electrical devices etc.

volume Pt = 15.8 cm³

density = 21.4 g/ cm³

mass = volume × density = 338.9 g.

Atomic mass of platinum = 195 g/mol.

The mass of one mole of platinum metal is 195 g. Then the number of moles in 338.9 g can be calculated as follows:

no.of moles = weight/ atomic mass

n = 338.9 g / 195 g/mol

  = 1.73 moles.

Therefore the number of moles of Pt is 1.73.

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Answer:

The molecular formula is Fe₂O₃

Explanation:

The molar mass of the compound is 199.55 g/mol; this means that if we have 1 mol of the compound, we'd have 199.55 g, we'd also have:

Now we calculate the moles of each element present in the given masses, using their atomic masses:

Then in 1 mol of the compound, there's 2.50 mol Fe and 3.75 mol O:

We convert the coefficients into integers (Divide them by the lowest number among them and multiply them by two):

Answer:

End point.

Explanation:

The end point is the point at which the indicator changes color in a titration.

The end point generally lags behind the neutralization point in a reaction where we have taken acidic or basic indicator.

Indicators show a change or appearance in color at particular pH. This pH is achieved after point of neutralization. However for some indicators the change in color can also be observed at point of neutralization or completion of reaction exactly. In that case equivalence point and end point will coincide.

Answer: The mass of mercury will be 20.15 g.

Explanation:

Density is defined as the mass contained per unit volume.

[tex]Density=\frac{mass}{Volume}[/tex]

Given : Mass of bromine = ?

Density of bromine= [tex]3.1g/ml[/tex]

volume of bromine = 6.5 ml

Putting in the values we get:

[tex]3.1g/ml=\frac{mass}{6.5ml}[/tex]

[tex]mass=20.15g[/tex]

Thus the mass of bromine is 20.15 g.

"The density of the water is given by the mass and the volume." The volume occupied by water is 1.63 L and ice cannot be contained in water as it has more volume.

Volume has been inversely related to the density as increased volume decreases the density by their inverse relation. The division of the mass and volume gives the density of the substances.

Given,

Density of water = 0.997 g/cm³

Density of ice = 0.917 g/cm³

The volume of the soft drink bottle = 1.50 L

The volume of ice is calculated as:

Volume = mass ÷ density

V = 1495.5 ÷ 0.917

= 1630 cm³

The unit conversion is done as:

1 cm³ = 1 mL

1630 cm³ = 1630 mL = 1.630 L

Ice cannot be fitted into the soft drink bottles as the volume of ice 1.63 L is more than the volume of the bottle, 1.50 L.

Therefore, the volume of ice is 1.630 L.

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The atomic weight of hydrogen is approximately 1 atomic mass unit. It is the lightest element with an atomic number of 1 and it consists mainly of one proton and one electron. The atomic weight represents the weighted average atomic mass of hydrogen's isotopes.

The atomic weight of hydrogen is often considered to be 1. This value is based on a standard atomic weight scale where hydrogen, the lightest element with the atomic number, Z, of 1, sets the reference point for the scale. The atomic mass of hydrogen is approximately 1 atomic mass unit (u), which is a unit derived from the mass of a carbon-12 atom. Since a hydrogen atom consists of one proton and one electron, and has no neutrons, its atomic mass is very close to 1 u. The actual mass of a hydrogen atom is about 1.7 x 10⁻²⁷ kg. However, in chemical reactions and on the periodic table, a weighted average of the atomic masses of the different isotopes of hydrogen (such as protium with no neutrons, deuterium with one neutron, and tritium with two neutrons) is used, leading to a slightly different average atomic mass of approximately 1.008. It is critical in chemistry to distinguish between the atomic number, which is the number of protons in the nucleus of an atom, and the atomic mass or atomic weight, which is the weighted average mass of an atom's isotopes as they occur naturally.

The mixing of enantiomers D and L yields a zero-degree observed rotation. Dilution of D with solvent maintains the same observed rotation, and also doesn't change the specific rotation.

Enantiomeric compounds D and L are mirror images of each other, thus they will rotate plane-polarized light equally but in opposite directions. Therefore, when these are mixed in equal volumes, the rotation of one enantiomer will cancel out the rotation of the other, resulting in an observed rotation of 0 degrees.

The solution's concentration is being halved when the solution of D is diluted with an equal volume of solvent. But, because the observed rotation is directly proportional to the path length and inversely proportional to the concentration, the observed rotation will remain the same at 0.20 degrees, because you're essentially doubling the path length while halving the concentration.

The specific rotation will stay the same i.e 0.20 degrees after the dilution in question c), because it is an intrinsic property of the substance D and does not change with concentration or path-length.

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Your answer will be C. It's not D i just took the test