A compound is found to consist of 1.37g of iron and 2.62g of chlorine. what is the percent by mass of chlorine in the compound?

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.

Learn more about atom,here:

https://brainly.com/question/13654549

#SPJ5

Answer:

Boiling point of water = 100 C. It is an intensive property.

Explanation:

Properties of matter can be broadly classified into two categories:

1) Chemical

2) Physical

Physical properties can be further classified as intensive and extensive properties

Intensive properties are properties that do not depend on the amount of matter. For example: Temperature, color, boiling point, melting point

Extensive properties are properties that  depend on the amount of matter. For example: Volume, mass, length

Water boils at a temperature of 100 C; this value is a constant irrespective of the volume (amount) of water. Hence boiling point is an intensive property.

Answer:

Lewis Dot Diagram

Explanation:

Answer:

1. Quantitative

2. Qualitative

3. Qualitative

Explanation:

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.

To determine the number of atoms in 3.08 mol of pure aluminum, multiply the number of moles by Avogadro's number.

In order to determine the number of atoms in 3.08 mol of pure aluminum, we need to use Avogadro's number. Avogadro's number is a fundamental constant in chemistry that represents the number of atoms or molecules in one mole of a substance. It is approximately equal to 6.022 × 10²³ atoms/mol.

To find the number of atoms in 3.08 mol of pure aluminum, you can use the following calculation:

Number of atoms = 3.08 mol × (6.022 × 10²³ atoms/mol)

By performing this calculation, you will find the number of atoms in 3.08 mol of pure aluminum.

https://brainly.com/question/30735712

#SPJ2

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].

Conserving mass in a chemical reaction means the atoms of each type should be the same on both the reactant and the product side.

Further explanation:

Balanced chemical reaction:

The chemical reaction that contains an equal number of atoms of the different elements in the reactant as well as in the product side is known as a balanced chemical reaction. The chemical equation is required to be balanced to follow the Law of conservation of mass.

Law of conservation of mass:

According to this law, the mass of an isolated system can neither be created nor be destroyed in any chemical reaction. The mass of reactants and the products should be equal in accordance with this law. In other words, the number of atoms of each type should be same on both sides of the chemical reaction. The reactant is the substance that undergoes a change in itself in a chemical reaction whereas the product is the one that is formed as a result of the chemical reaction.

For example, the balanced chemical reaction between [tex]{{\text{P}}_{\text{4}}}[/tex] and [tex]{\text{C}}{{\text{l}}_{\text{2}}}[/tex] occurs as follows:

[tex]{{\text{P}}_4} + 10{\text{C}}{{\text{l}}_2} \to 4{\text{PC}}{{\text{l}}_5}[/tex]

Here,

[tex]{{\text{P}}_{\text{4}}}[/tex] and [tex]{\text{C}}{{\text{l}}_{\text{2}}}[/tex] are the reactants.

[tex]{\text{PC}}{{\text{l}}_5}[/tex] is the product.

In the above reaction, the number of potassium atoms on both reactant and product side is 4 while the number of chlorine atoms on both sides is 20. So Law of conservation of mass is followed.

Learn more:

1. Balanced chemical equation: https://brainly.com/question/1405182

2. Write the chemical formula of the compound: https://brainly.com/question/10585691

Answer details:

Grade: High School

Subject: Chemistry

Chapter: Basic concepts of chemistry

Keywords: balanced chemical reaction, law of conservation of mass, reactant, product, P4, Cl2, PCl5, 10 Cl2, 4 PCl5, atoms, same.

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.

Learn more: https://brainly.com/question/6259028

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. 

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.

The general properties of the elements to the right in the modern periodic table are low melting and boiling point, high ionization energy, high electron affinity, poor conductor, and lack of metallic luster.

The elements present on the right-hand side of the modern periodic table are nonmetals. Nonmetals are the elements that form negative ions by gaining electrons and have 4, 5, 6, or 7 electrons in their outermost shell.

Non-metals lack all metallic attributes and are good insulators of heat and electricity. They are generally gases at room temperature and sometimes liquid.

Nonmetals are high ionization energies and high electronegativity so they gain electrons when reacting with other compounds, to form covalent bonds.

Nonmetals have high electronegativities so they have a strong tendency to attract electrons. Nonmetals exist as liquids or gases therefore, they have low melting and boiling points under normal conditions.

Learn more about nonmetals, here:

https://brainly.com/question/2273750

#SPJ2

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.

https://brainly.com/question/25094208

#SPJ12

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.

Since the density of water is 1 g /mL, hence there is 100 g of H2O. So total mass is:

m = 100 g + 5 g = 105 g

=> The heat of reaction can be calculated using the formula:

δhrxn = m C ΔT

where m is mass, C is heap capacity and ΔT is change in temperature = negative since there is a decrease

δhrxn = 105 g * 4.18 J/g°C * (-2.30°C)

δhrxn = -1,009.47 J

=> However this is still in units of J, so calculate the number of moles of NaCl.

moles NaCl = 5 g / (58.44 g / mol)

moles NaCl = 0.0856 mol

=> So the heat of reaction per mole is:

δhrxn = -1,009.47 J / 0.0856 mol

δhrxn = -11,798.69 J/mol = -11.8 kJ/mol

The correct number of neutrons in the nucleus of the second isotope of rubidium is 50.

To solve this problem, we can use the weighted average of the atomic masses of the two isotopes to find the number of neutrons in the second isotope. Let's denote the number of neutrons in the second isotope as [tex]\( n \)[/tex].

We know the following:

- The first isotope has 48 neutrons and a natural abundance of 72%.

- The calculated atomic mass of rubidium is 85.5.

- The second isotope has \( n \) neutrons and a natural abundance of [tex]\( 100\% - 72\% = 28\% \)[/tex].

The atomic mass of an isotope is calculated by adding the number of protons and neutrons in its nucleus. Since rubidium has 37 protons, the atomic mass of the first isotope is [tex]\( 37 + 48 = 85 \)[/tex].

Now, let's set up the equation for the weighted average atomic mass:

[tex]\[ 0.72 \times 85 + 0.28 \times (37 + n) = 85.5 \][/tex]

Solving for [tex]\( n \)[/tex]:

[tex]\[ 61.2 + 0.28n = 85.5 \] \[ 0.28n = 85.5 - 61.2 \] \[ 0.28n = 24.3 \] \[ n = \frac{24.3}{0.28} \] \[ n = 86.79 \][/tex]

Since the number of neutrons must be a whole number, we round to the nearest whole number:

[tex]\[ n \approx 87 \][/tex]

However, we must subtract the number of protons (37) to find the number of neutrons:

[tex]\[ n_{\text{neutrons}} = 87 - 37 \][/tex]

[tex]\[ n_{\text{neutrons}} = 50 \][/tex]

Therefore, the second isotope of rubidium contains 50 neutrons in its nucleus.