Which description below represents a hydrocarbon?
a. an organic compound that contains only carbon and hydrogen atoms
b. an organic compound that contains the maximum number of hydrogen atoms
c. an organic compound that contains fewer than the maximum number of hydrogen atoms
d. a group of compounds in which there is a constant increment of change in molecular structure from one compound in the series to the next?

Fluorine and Nitrogen are both non-metals which posses non polar covalent bonds. BaO on the other hand is a combination of a metal (Ba) and non metal (O) hence making it an ionic bond. So in this case, only SO2 has polar covalent bond.

Answer:

SO2

Sulfur dioxide (SO2) is a substance with polar covalent bonds among the given options. It has atoms with different electronegativities, hence the unequal sharing of electrons. SO2's bent molecular shape also contributes to its overall polarity.

The substance with polar covalent bonds among N2, BaO, F2, and SO2 is SO2 (sulfur dioxide). Polar covalent bonds occur when there is an unequal sharing of electrons between atoms with different electronegativities.

Nitrogen (N2) and Fluorine (F2) are both diatomic molecules of the same element and thus have nonpolar covalent bonds because they share electrons equally. Barium oxide (BaO) is an ionic compound because it is composed of a metal and a nonmetal.

Sulfur dioxide (SO2), on the other hand, has atoms with different electronegativities which leads to an unequal sharing of electrons and the formation of polar covalent bonds. The molecule is also bent in shape, which contributes to its overall polarity.

Answer:

1. Quantitative

2. Qualitative

3. Qualitative

Explanation:

Answer: mass = 19 grams

Explanation: Density is directly proportional to mass and indirectly proportional to the volume. So, the density formula is:

[tex]density=\frac{mass}{volume}[/tex]

density and volume are given and the question asks to calculate the mass. So, the formula could be rearranged as:

mass = density x volume

Given density is [tex]\frac{5.2g}{cm^3}[/tex] and the volume is [tex]3.7cm^3[/tex] .

Let's plug in the values in the formula to calculate the mass:

mass = [tex]\frac{5.2g}{cm^3}*3.7cm^3[/tex]

mass = 19.24 grams

Both the density and volume have two sig figs, so if the answer is round off to correct number of sig figs then the mass will be 19 grams.

The reason why Tin granules is mostly used or preferred than just a piece of Tin because a piece of Tin is plainly metal, in which this will be difficult in having it to be oxidized when it is exposed or in the air rather than Tin granules.

Answer:

To increase the surface area of reaction.

Explanation:

The tiny granules are used as they increase the surface-area to volume ratio. Smaller granules have a higher surface area to volume ratio. In a chemical reaction, it means that the reaction increases as there is more particle to particle reaction.

Hence the granules are preferred to solids.

For an electron to move from its zero or ground state to an excited state of higher energy level, of course it has to absorb energy.

Just like a person, energy must be supplied so that the person will be lively or active.

Answer:

energy must be absorbed

An electron absorb energy when change from ground state to excited state.

If an electron in an atom change from the ground state to an excited state, it must be absorb energy because with the help that energy it can move against the force of attraction of nucleus of that atom.

This energy provided to electron in order to remove the electron from outermost shell of that atom. If the electron release the energy then it comes back to its original position so we can conclude that electron absorb energy when change from ground state to excited state.

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The answer is false. It is because the electron structure of the atom is not determined by using the direct observation of using an x-ray but rather the usage of theoretical modeling and the emission spectra will be useful in observing.

Explanation:

A molecule is defined as a substance which contains chemically bonded same type of elements.

For example, [tex]H_{2}[/tex] is a molecule and it exists as a gas which is colorless and odorless.  

Hydrogen gas is represented as [tex]H_{2}[/tex].

Whereas a compound is defined as a substance which contains chemically bonded different type of elements in a fixed ratio by mass.

For example, [tex]NO_{2}[/tex] is a compound and has a reddish brown color with toxic odor.

Nitrogen dioxide is represented as [tex]NO_{2}[/tex].

The region(s) of the periodic table which are made up of elements that can adopt both positive and negative oxidation numbers are the “non-metal” region. As we can see on the periodic table, the elements situated at the right side of the table have two oxidation states, one positive and the other a negative. 

Presence of residual HCl will react with [tex]NaHCO_3[/tex], reducing its amount and thus lower the calculated percentage of [tex]NaHCO_3[/tex] in the mixture.

If a student cleaned a crucible with HCl and then added a [tex]NaHCO_3[/tex]-NaCl mixture without rinsing or drying it, this would affect the calculated percentage of [tex]NaHCO_3[/tex] in the mixture due to the reaction between the residual HCl and [tex]NaHCO_3[/tex]. Specifically, HCl is an acid which would react with [tex]NaHCO_3[/tex], a base, to produce NaCl, [tex]CO_2[/tex], and [tex]H_2O[/tex].

[tex]NaHCO_3[/tex] (s) + HCl (aq) → NaCl (aq) + [tex]CO_2[/tex] (g) + [tex]H_2O[/tex] (l)

This reaction would decrease the amount of [tex]NaHCO_3[/tex] in the crucible, leading to a lower calculated percentage of [tex]NaHCO_3[/tex] in the mixture than actually present. This is because the [tex]CO_2[/tex] produced escapes as a gas, reducing the mass that is attributed to [tex]NaHCO_3[/tex].

Answer:

The object is not traveling fast enough to match Earth’s curvature.

Explanation:

c on edge

The deflection of alpha particles in Rutherford's gold foil experiment was caused by the presence of a dense, positively charged nucleus within the atom that repelled the positively charged alpha particles.

The deflection of the alpha particles in Rutherford's gold foil experiment is attributed to the presence of a dense, positively charged center or 'nucleus' in the atoms. Alpha particles, which are helium atoms that have lost their electrons and are therefore positively charged, were fired at a thin piece of gold foil. The majority of these alpha particles passed through the gold foil, suggesting that the atoms consist mostly of empty space.

However, a small fraction of the alpha particles were significantly deflected or even completely reversed direction. This indicates that these particles encountered a highly concentrated positive charge (the nucleus of the atom) that repelled the like-charged alpha particles. This deflection allowed Rutherford to deduce the presence of a small, dense nucleus within the atom, contradicting the then-established 'plum pudding' model of atom structure.

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Actually the answer to this problem primarily depends on how much Fe2+ is initially contained in the solution.  So if in case it contains more or equal amount than the cerium solution, then the answer is C. But if it has much less, then it would be D.

But I believe the answer in this case is:
C

Answer:

Ce+3

Explanation:

The relative atomic mass of an atom is found out by comparing the mass of the atom to the mass of an atom of carbon-12.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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Bright line spectrum is produced when electrons within an atom transition from higher energy level to lower one, emitting light at distinct wavelengths. These distinct wavelengths constitute the emission lines forming the bright line spectrum.

Each element has a unique set of such energy levels, allowing the identification of specific elements.

The bright line spectrum of an element is produced when electrons in an atom absorb energy and move from a lower energy level to a higher one, a state known as excited state. As these electrons transition back to their original or lower energy level, they emit energy in the form of light, which is at distinct wavelengths.

These distinct wavelengths appear as a series of lines in a spectrograph, known as emission lines, and they form the bright line spectrum of an element as each element possesses its own unique set of energy levels. An understanding of such spectral lines allows us to identify specific elements present in the stars and other celestial bodies.

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The bright line spectrum of an element is produced by the emission of photons when electrons transition from higher energy levels to lower ones. Each element has its own unique set of energy levels, resulting in a distinct pattern of spectral lines.

The bright line spectrum of an element is produced by the emission of photons when electrons transition from higher energy levels to lower ones. Each element has its own unique set of energy levels, resulting in a distinct pattern of spectral lines. When an electron absorbs a photon and moves to a higher energy level, absorption lines are observed. These spectral lines allow scientists to identify the elements present in a substance.

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Adding hot cocoa to water is a physical change because it involves combining substances without changing their chemical compositions.

Adding hot cocoa to hot water is considered a physical change. When you mix hot cocoa powder with hot water, the hot cocoa dissolves and the two substances combine, but this process does not result in new chemical substances being formed. Just like other physical changes such as the melting of ice or the dissolving of sugar in water, the composition of the resulting mixture is still a combination of water and cocoa particles.

In contrast, a chemical change involves a substance transforming into a new substance with a different chemical composition, as exemplified by iron rusting (Fe + O₂ → Fe₂O₃) or the burning of gasoline.

Answer: true because they have similar chemical properties

Explanation:

Because Elements present in the same group have the same number of valence electrons.

Final answer:

To calculate the grams of oxygen that reacted, subtract the mass of copper (254.2 grams) from the mass of the copper oxide product (286.2 grams) to get 32.0 grams of oxygen.

Explanation:

To find out how many grams of oxygen reacted with copper to form copper oxide, perform a mass difference calculation from the given data. The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction. Therefore, the mass of products formed in a reaction equals the mass of reactants.

The initial mass of copper is given as 254.2 grams, and the final mass of the copper oxide product is 286.2 grams. To find the mass of oxygen that has combined with the copper, subtract the mass of copper from the mass of the copper oxide product:

Mass of oxygen = Mass of copper oxide – Mass of copper

Mass of oxygen = 286.2 grams – 254.2 grams

Mass of oxygen = 32.0 grams

Therefore, 32.0 grams of oxygen must have reacted with the copper.

The volume of a 75-gram sample of gold at STP is approximately 3.886 cubic centimeters, calculated using the formula V = m/d, where m is the mass and d is the density of gold.

To determine the volume of a 75-gram sample of gold at standard temperature and pressure (STP), we must use the formula that relates mass (m), density (d), and volume (V), which is m = dV. Since the density (d) of gold is 19.3 g/cm³, we can rearrange the formula to solve for volume: V = m/d.

By plugging in the mass of the gold sample and the given density, we get:

V = 75 g / 19.3 g/cm³ = 3.886 cm³

Therefore, the volume of a 75-gram sample of gold at STP is approximately 3.886 cubic centimeters.

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Actually Igneous rocks are classified either based on grain size or based on mineralogy. However grain size is clearly not a chemical property. So we can say that they are classified chemically based on mineralogy or the abundance of quartz or silica present.

Answer:

Lewis Dot Diagram

Explanation: