A sample of a gas originally at 29 °c and 1.25 atm pressure in a 3.0 l container is allowed to contract until the volume is 2.2 l and the temperature is 11 °c. the final pressure of the gas is ________ atm.

The correct answer is b. Law of Definite Composition.

A) Law of Conservation of Mass

FALSE. This law describes the masses of substances before and after a reaction as constant. Atoms only rearrange in during chemical reactions. None is destroyed nor are any new atoms created. Therefore, the total mass of reactants must always be equal to the total mass of the products.

B) Law of Definite Composition

TRUE. Sometimes called the Law of Constant Composition, this law states that regardless of the source of a compound, its composition is the same. The mass percentages of the elements that make up a particular compound is constant. KCl, in the example, will always have 1 mol of potassium ions and 1 mole of chloride per mole of the potassium chloride regardless of whether it was from Chile or Poland.

C) Law of Multiple Proportion

FALSE. This law describes how an element combines with another element to form multiple compounds. The ratio at which they combine are in whole numbers.

D) Law of Conservation of Mass and Definite Composition

FALSE. The Law of Conservation of Mass pertains to what happens to masses  of substances before and after a chemical reaction. This problem is about different sources of a compound and not about a specified chemical reaction.

E) Law of Conservation of Mass and Multiple Proportions

FALSE. The problem is about the mass percentage of compounds from different sources, not about the reaction of the compound nor other compounds formed by potassium and iodine.

Keywords: Law of Definite Proportion, Law of Constant Composition

Laws gave ideas about conservation, composition, and proportions. The same percent by mass of the potassium in the sample indicates the law of definite composition. Thus, option b is correct.

The law of definite composition states the constant composition of the chemical compound irrespective of the place they are. The ratio of the element in the compound does not vary because of the source and preparatory methods.

The sample of potassium chloride will have the same proportion of potassium in both Chile and Poland as it is a fixed ratio that does not depend on the source. It ensures the uniform preparation of the chemical compound.

Therefore, the sample will have the same proportion of potassium due to the law of definite composition.

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During a chemical reaction there occurs a bond making or bond breaking. Chemical bonds are formed by electron sharing or lose or gain of electrons from atoms.

A chemical change of a substance is the change in its chemical bond like new bond formation or existing bond breakes in a chemical reaction.There are different types of chemical bonds such as ionic bond, covalent bond, hydrogen bond etc.

Ionic bonds are formed between metals and nonmetal atoms by losing electrons from the metals to the non-metals. Where the atoms are of high electronegativity difference. For example, NaCl is an ionic compound.

Covalent bonds are formed by sharing one or more electrons between atoms based on their valence electrons. For example CH4 is a covalent compound formed by sharing of 4 electrons from carbon and one electron from each hydrogen.

Atoms or molecules when combine together to form products, there occurs regrouping of atoms by bond making  or bond breaking by exchange of electrons.

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A chemical reaction involves breaking chemical bonds in reactants and forming new bonds in products, which leads to a change in energy and results in new substances with different properties.

During a chemical reaction, there are significant changes in the way atoms are bonded together. The changes can be described in terms of the breaking and forming of chemical bonds and the transfer or sharing of electrons among atoms. Atoms are held together in substances by chemical bonds. During a chemical reaction, these bonds are broken, which leads to the separation of atoms. They subsequently rearrange themselves and form new bonds, resulting in new substances with different properties. The substances we start with are known as the reactants, and the new substances formed are the products. An arrow in the chemical equation represents the direction from reactants to products, which signifies the progression of the chemical reaction. During this process, changes in the energy of the system often occur because breaking old bonds and forming new ones involve either absorption or release of energy.

Answer:

b. hyoid bone adapted for roaring  is the correct answer.

Explanation:

Hyoid bone adapted for roaring is the example of physiological adaptation.

A physiological adaptation is an adaptation and the control of an organism’s internal body state so that it can adapt to its changing conditions.

A physiological adaptation is an organism’s inner response to outside stimuli to maintain homeostasis state.

Physiological adaptations are the physiological changes in an organism that assist them to sustain.

physiologic adjustment improved the ability of an organism to survive with the uncertain environment.

A sample of 5 lb has a mass, expressed in grams, of 2.268 × 10³ g (Option D).

To convert pounds (lb) to grams (g), we need a conversion factor. In this case, the conversion factor is 1 lb = 453.592 g. A mass of 5 lb, expressed in grams, is:

[tex]5 lb \times \frac{453.592 g}{1lb} = 2.268 \times 10^{3} g[/tex]

A sample of 5 lb has a mass, expressed in grams, of 2.268 × 10³ g.

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Final answer:

The bond character changes as electronegativity varies, with greater differences leading to a bond with more ionic character, causing unequal electron distribution and partial charges on the atoms.

Explanation:

Electronegativity is a measure of the tendency of an atom to attract electrons or electron density towards itself. The character of a bond—whether it is ionic, polar covalent, or nonpolar covalent—is determined by the difference in electronegativity between the two bonded atoms. When there is a significant difference in electronegativity, the bond is considered ionic, meaning one atom effectively donates an electron to the other. As the electronegativity difference decreases, the bond becomes more covalent, with electrons shared more equally between atoms. In the case of a polar covalent bond, the electrons are shared unequally, leading to a partial charge on each atom and creating a dipole moment (μ = Qr).

The larger the difference in electronegativity, the more polarized the electron distribution in the bond. This causes the atom with higher electronegativity to have a partial negative charge, while the atom with lower electronegativity has a partial positive charge. In summary, as the difference in electronegativity increases, the ionic character of the bond increases, creating a more pronounced uneven distribution of electron density.

Answer: The correct answer is Option C.

Explanation:

Law of conservation of mass states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form. This means that total mass on the reactant side is equal to the total mass on the product side.

This also means that the total number of individual atoms on the reactant side will be equal to the total number of individual atoms on the product side.

For the given chemical reaction, the reactants are: [tex]C_2H_4O_2\text{ and }NaHCO_3[/tex]

Number of carbon atoms = 3

Number of hydrogen atoms = 5

Number of sodium atoms = 1

Number of oxygen atoms = 5

These number of individual atoms must be present on the product side as well.

Hence, the correct answer is Option C.

Answer is: gasoline.

Gasoline is a mixture  of many different hydrocarbons: alkanes (paraffins), cycloalkanes  and alkenes (olefins).

Salt and carbon dioxide are chemical compounds, aluminium (Al) is an chemical element.

Pure substance is made of only one type of atom (element) or only one type of molecule, it has definite and constant composition with distinct chemical properties.

Pure substances can be separated chemically, not physically, that is difference between pure substances and mixtures.

Answer:

Elements in the same __group__ are similar due to similarities in their number of valence electrons.

Explanation:

Answer: b.more acidic the solution

Explanation:

pH is the measure of acidity or alkalinity of a solution.  Acids are substances which gives [tex]H^+[/tex] ions when dissolved in water.

[tex]HX\rightarrow H^++X^-[/tex]

pH is calculated by taking negative logarithm of hydrogen ion concentration.

[tex]pH=-\log [H^+][/tex]

[tex]pH=log\frac {1}{H^+}[/tex]

Thus as pH and [tex]H^+[/tex] are inversely related, a solution having lower pH will have more amount of [tex]H^+[/tex] concentration , a lower amount of [tex]OH^_[/tex] concentration and will be more acidic.

The lower the pH of a solution, the more acidic it becomes. The pH level measures the concentration of hydrogen ions in a solution, and a lower pH indicates a higher concentration, hence a higher acidity.

The lower the pH of a solution, the more acidic the solution becomes. The pH scale, which ranges from 0 to 14, is used to measure the acidity or alkalinity of a solution. A pH of 7 represents a neutral solution, while a pH below 7 is acidic, and a pH above 7 is alkaline (basic). The pH level quantifies the concentration of hydrogen ions (H+) in a solution. Therefore, a lower pH indicates a higher concentration of hydrogen ions, which translates to a higher acidity.

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Answer: 268.1 u

Explanation:

Mass of isotope 1 = 267.8 u

% abundance of isotope 1 = 90.3% = [tex]\frac{90.3}{100}=0.903[/tex]

Mass of isotope 2 = 270.9 u

% abundance of isotope 2 = 9.7% = [tex]\frac{9.7}{100}=0.097[/tex]

Formula used for average atomic mass of an element :

[tex]\text{ Average atomic mass of an element}=\sum(\text{atomic mass of an isotopes}\times {{\text { fractional abundance}})[/tex]

[tex]A=\sum[267.8\times 0.903+270.9\times 0.097][/tex]

[tex]A=268.1u[/tex]

Therefore, the average atomic mass of an element is, 268.1 u

In the given reaction, Chlorine is reduced (its oxidation state changes from -1 to -1), and Oxygen is oxidized (its oxidation state changes from -2 to 0).

In the given chemical reaction, KClO4 is the reactant that decomposes into KCl and 2O2 which are the products. Oxidation states for each element on each side of the equation are as follows, K: +1, Cl: –1, and O: –2 in KClO4, and K: +1, Cl: –1, and O: 0 in KCl and O2. In this reaction, Chlorine (Cl) is reduced from an oxidation state of -1 to -1, while Oxygen (O) is oxidized from an oxidation state of -2 to 0.

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The dissociation of CdCl2(aq) in the solution is depicted as CdCl2(aq) → Cd²⁺(aq) + 2Cl⁻(aq). It's an essential part of Ionic Chemistry.

The dissociation of CdCl2(aq) refers to the process where the compound cadmium chloride, when put in solution (water has been omitted per your instructions), breaks down into its individual ions. This dissociation is represented by the equation: CdCl2(aq) → Cd²⁺(aq) + 2Cl⁻(aq). Here, the CdCl2(aq) molecule breaks apart in water to form one Cd²⁺ cation and two Cl⁻ anions.

The above equation represents the process in Ionic Chemistry where ionic compounds dissociate into their constituent ions in a solution. It's a crucial aspect of the behavior of chemical species in various reactions and processes.

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Answer:

The periodic table of the elements is ordered in increasing order of the atomic number of the elements (this is their number of protons) and according to the similarity of their properties.

Explanation:

To classify the similarity in the properties, the elements are arranged in 7 rows, periodic calls, and in 18 columns, called groups.  

The chemical elements are ordered according to their properties from left to right and from top to bottom.

In the same group, all elements have the same number of electrons in their last layer. This makes the chemical properties of the elements very similar.

The period that an element occupies coincides with its last electronic layer. That is, an element with five electronic layers will be in the fifth period. This generates that the elements that are in the same row have different properties but similar masses.

The table is also divided into four groups, according to the orbital that the outermost electrons are occupying, and these groups are named according to the letter of the orbital referred to.

In summary, due to this classification by similarity in their characteristics, the elements are divided into three broad categories: metals, metalloids and nonmetals, which at the same time are divided into subgroups.

Answer : The average mass of these three sample is 45.47 g

Explanation :

Average : It is defined as the sum of all the values divided by the total number of values.

[tex]\text{Average}=\frac{\text{Sum of all values}}{\text{Number of values}}[/tex]

As we are given the mass of three samples which are, 104.2 g, 3.21 g, 29.0 g

Now we have to determine the average mass of the given sample.

[tex]\text{Average}=\frac{\text{Sum of all values}}{\text{Number of values}}[/tex]

[tex]\text{Average}=\frac{104.2g+3.21g+29.0g}{3}=\frac{136.41}{3}=45.47g[/tex]

Therefore, the average mass of these three sample is 45.47 g

The golfer sent the golf ball flying toward the cup to score a hole-in-one, provide the most complete description of an object motion. Therefore, option C is correct.

Motion is the shift in an object's location with relation to its environment over a specific amount of time. The following phrases can be used to describe the motion of an object with mass: distance, displacement, and speed.

Translational motion is the term used to describe how an atom can move from one place in space to another. Additionally, molecules composed of several atoms can vibrate because of chemical bonds, which cause the atoms to move about their equilibrium position like springs.

Oscillatory, rotational, transactional, uniform, non-uniform, periodic, circular, and linear motion are only a few examples of the different motion types that can exist.

Thus, option C is correct.

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Answer:

C is equal to 2 and D is equal to 2.

Explanation:

Here C and D represents number of electrons in 1s and 2s orbitals.

Be has 4 electrons. Now, in order write electronic configuration of an atom, electron filling should be started from orbital with lowest energy.

Energy order of orbital with increasing energy: 1s< 2s< 2p< 3s< 3p< 4s< 3d....

So, filling of electron should start from 1s orbital then 2s, 2p, 3s, 3p and so on.

Each orbital can have maximum of 2 electrons.

So electronic configuration of Be is: [tex]1s^{2}2s^{2}[/tex]

Oxygen as well as bromine were indeed nonmetals, and the majority of nonmetals tend to prefer up electrons to become more stable.

Nonmetals include colorless vapors and glossy, high melting point solids; they are chemical elements that often lacking a majority of metallic qualities.

The electron would be a subatomic particle with a negatively elementary charged electric charge.

Therefore, Oxygen as well as bromine were indeed nonmetals, and the majority of nonmetals tend to prefer up electrons to become more stable.

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Answer: False

Explanation:

Humanist believe that humans as well as other living organism has evolved through time and will continue to evolve.

They believe in the happiness and well-being of the human person.