What is the mass percent of nitrogen in lead (ii) nitrate (pb(no3)2)?

Hello!

If 832J of energy is required to raise the temperature of a sample of aluminum from 20.0°C to 97.0°C, what mass is the sample of aluminum? (The specific heat of aluminum is 0.90 J/(g × °C).

a) 0.10 g

b) 10.0 g

c) 12.0 g

d) 57.7 g

Data:

Q (Amount of heat) = 832 J

m (mass) = ?

c (Specific heat) = 0.90 J/(g × ° C)

T (final) = 97 ºC

To (initial) = 20 ºC

ΔT = T - To → ΔT = 97 - 20 → ΔT = 77 ºC

Formula:

Q = m*c*ΔT  

Solving:

[tex]Q = m*c*\Delta{T}[/tex]

[tex]832 = m*0.90*77[/tex]

[tex]832 = 69.3\:m[/tex]

[tex]69.3\:m = 832[/tex]

[tex]m = \dfrac{832}{69.3}[/tex]

[tex]\boxed{\boxed{m \approx 12.00\:g}}\end{array}}\qquad\quad\checkmark[/tex]

Answer:

12.0 g

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Answer:

1

Explanation:

Just got it right on the quiz.

That is the exchange to fill.

Hope this helps.

Final answer:

Bromine is added to an organic molecule to test for saturation; it reacts with unsaturated compounds causing a color change, while the color remains the same in the presence of saturated compounds.

Explanation:

The substance added to an organic molecule to test for the degree of saturation is bromine. This test is based on bromine's distinctive brownish-orange color, which fades upon reaction with unsaturated compounds. In the reaction, bromine is added to the double or triple bonds present in unsaturated hydrocarbons, causing a decolorization as it forms a dibromo compound. On the other hand, if the organic molecule is saturated, the bromine retains its color as there are no double or triple bonds for the bromine to react with.

On a molecular level, the reaction demonstrates the difference between saturated and unsaturated hydrocarbons. Saturated hydrocarbons, such as alkanes, have a C-H bond that can potentially react with bromine, whereas unsaturated hydrocarbons like alkenes and alkynes have double or triple bonds that readily react with bromine, respectively. This chemical behavior is part of the microscopic domain that helps distinguish structural differences in organic compounds.

N2 has a lower boiling point than CO because N2, being a nonpolar molecule, can't exhibit dipole-dipole attractions that CO, being a polar molecule, can. This results in weaker intermolecular forces in N2 than CO, hence a lower boiling point.

The reason why N2 has a lower boiling point than CO is due to the different intermolecular forces they experience. Both CO and N2 are diatomic molecules with similar atomic masses, therefore, they experience similar London dispersion forces. However, the key difference is that CO is a polar molecule and thus, it experiences dipole-dipole attractions. On the other hand, N2 is a nonpolar molecule and therefore, can't exhibit dipole-dipole attractions. Hence, the dipole-dipole attractions in CO are stronger than the dispersion forces in N2, leading to a higher boiling point for CO.

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Boron is 5 in the periodic table of elements and the mass is rounded up 10 11. If the atomic number of boron is 5, that means that there would be 5 protons and 5 electrons.

Answer:

Fusion.

Explanation:

The core squeezes together so tightly that four hydrogen nuclei combine to form one helium atom. This is the textbook definition of nuclear fusion.

Answer:

The molar solubility of [tex]Ni(OH)_2[/tex] in water [tex]7.93\times10^{-6} mol/L[/tex].

Explanation:

[tex]Ni(OH)_2\rightleftharpoons Ni^{2+}+2OH^-[/tex]

                        S        2S

Solubility of Nickel hydroxide =[tex]K_{sp}=2.0\times 10^{-15}[/tex]

[tex]K_{sp}=S\times 2S^{2}=4S^3[/tex]

[tex]2.0\times 10^{-15}=4S^3[/tex]

[tex] S=7.93\times10^{-6} mol/L[/tex]

The molar solubility of [tex]Ni(OH)_2[/tex] in water [tex]7.93\times10^{-6} mol/L[/tex].

Answer:

oven cleaner: ph=13

water: ph=6.2

blood: ph=7.4

vinegar ph=2.2

Explanation:

got it right on ed

The pH values for the given solutions are calculated using the formula pH = -log[H+], where [H+] is the concentration of hydrogen ions. The pH values for an oven cleaner, water, blood, and vinegar are found to be 13.0, 7.2, 7.4, and 2.2 respectively.

To calculate the pH of a solution, we use the formula pH = -log[H+]. Here [H+] represents the molar concentration of hydrogen ions in moles per liter (M).

Oven cleaner: With [H+] = 10-13 M, we find pH as follows:

pH = -log(10-13) = 13.0

Water: For [H+] = 0.0000007 M or 7×10-7M:

pH = -log(7×10-7) = 7.2

Blood: Given [H+] = 0.00000004 M or 4×10-8M:

pH = -log(4×10-8) = 7.4

Vinegar: With [H+] = 0.0063 M:

pH = -log(0.0063) = 2.2

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The percent ionic character of a chemical bond, such as between beryllium and fluorine, can be determined using the difference in electronegativity between the two elements based on Pauling's scale. Most bonds exhibit partial ionic character, as they fall within the spectrum between purely ionic and purely covalent.

The percent ionic character of a chemical bond refers to the degree to which the bond exhibits ionic properties. In an ideal ionic bond, electrons are completely transferred from one atom to another. However, in reality, most bonds fall within the spectrum between purely ionic and purely covalent, exhibiting partial ionic character.

In the case of the bond between beryllium and fluorine, you can determine the percent ionic character by making use of Pauling's electronegativity values. First, you would calculate the difference in electronegativity between the two elements. Then, you use this difference to estimate the percent ionic character based on Pauling's scale.

For example, consider the hypothetical molecule HCl mentioned in the reference. Supposed that HCl was completely ionic, its molecular dipole moment was calculated to be 6.09 D. The experimentally measured bond moment, however, turned out to be 1.03 D. The percent ionic character was hence calculated as the bond moment divided by the theoretical fully ionic bond moment, multiplied by 100%. The result was 17%.

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Answer: Because of the arrangement of atoms in a compound.

Explanation:

A compound is defined as the chemical specie which is formed by the combination of two or more different type of atoms. For Example: [tex]H_2O,O_2[/tex] etc...

A compound has different physical and chemical properties than corresponding elements because of change in identity. For Example: Hydrogen and oxygen are gases, but the compound formed by the combination of these two that is water is liquid.

In a chemical compound, elements are combined in a fixed ratio of their masses.

Hence, a compound has characteristic property because of the arrangement of atoms in a compound

Answer:

Explanation:

The amine functional group is obtained by subsititution of one or more hydrogen atoms in the ammonia compound.

Ammonia is NH₃.

Then,

                        R'''

                         |

                 R' -  N - R''

In this case, the three subsitutuents are silyl groups. The silyl group is derived form silane and is SiH₃. So, the tcompound trisilylamine is:

                    SiH₃

                      |

          SiH₃ -  N - SiH₃

Thus, you can count 3 hydrogen atoms for every silylgroup for a total of 9 hydrogen atoms in each molecule of trisilylamine.

As you move across a period, the atomic mass increases because the atomic number also increases. ... The atomic mass for any given atom mainly comes from the mass of the protons and neutrons.

Moving from left to right across a period on the periodic table, the atomic mass of the elements generally increases. This is due to an increase in the number of protons and neutrons in the nucleus. For instance, in the second period, the atomic mass of Lithium is less than that of Neon.

As you move from left to right across a period on the periodic table, there is an increase in the atomic mass of the elements. This happens because the number of protons, which contribute to the atomic mass, in the nucleus of an atom increases. The atomic mass is approximated by the mass number, which is the sum of the number of protons and neutrons in an atom's nucleus. Therefore, as the number of protons (and usually neutrons) increases, the atomic mass of the elements also generally increases.

For example, in the second period, the atomic mass of Lithium (Li) is about 7 amu, while the atomic mass of Neon (Ne), at the end of the same period, is about 20 amu.

Thus, when moving from left to right within a period of the periodic table, the atomic mass generally increases due to an increase in the number of protons and neutrons in the nucleus.

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Explanation:

According to collision theory, more is the number of collisions between the particles of reactants more will be the rate of a reaction.

Two important factors of collision theory are as follows.

Sufficient energy: Molecules participating in a chemical reaction should have sufficient amount of energy so that they can overcome activation energy barrier and participate effectively in the reaction.

Orientation: Collision between the molecules should take place with proper orientation so that they successfully result in the formation of products.

According to the collision theory, the two factors that must be true for a reaction to occur are sufficient energy and proper orientation of reactant particles.

The collision theory states that a reactant molecules must collide effectively with energy greater than or equals to activation energy for products to be formed.

According to the collision theory, the two factors that must be true are:

Therefore, sufficient energy and proper orientation of particles is necessary for product formation.

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Answer:

The correct option is:

"Y-intercept of (0, −1), starts down on the left, gets closer to y = −3 on the right"

Explanation:

You have the following function:

[tex]f(x)=y=4*(\frac{1}{2}) ^{x+1} -3[/tex]

The intersection on the "y" axis implies that the value at "x" must be zero. So, to calculate the value in "y" you must replace "x" with the value 0 and perform the corresponding calculations:

[tex]y=4*(\frac{1}{2}) ^{0+1} -3[/tex]

[tex]y=4*(\frac{1}{2}) -3[/tex]

[tex]y=2 -3[/tex]

[tex]y=-1[/tex]

Being (x, y) a point on the graph,  the y- intercept is (0,-1).

This function is an exponential function function, whose form corresponds to the general expression:

[tex]g(x)=k*a^{x-h} +b[/tex]

Where:

The graph of the function is shown in the attached image.

The correct option is:

"Y-intercept of (0, −1), starts down on the left, gets closer to y = −3 on the right"

Final answer:

The molar enthalpy change of H2O (l) when liquid water is heated from 41.7 C to 76.2 C can be calculated using the formula: Q = mcΔT

Explanation:

The molar enthalpy change of H2O (l) when liquid water is heated from 41.7 C to 76.2 C can be calculated using the formula:

Q = mcΔT

Where,

From the given equation, we can calculate the molar enthalpy change when 1 mole of water is heated using the molar mass of water (18.015 g/mol).

Using the formula:

ΔH = Q / n

Where,

We can substitute the values into the formula and calculate the molar enthalpy change.

Final answer:

A single measurement cannot be considered precise as precision requires consistency across multiple measurements. However, a single measurement can be considered accurate if it closely matches the true or accepted value. Accuracy and precision are critical in scientific measurements for validity.

Explanation:

The concepts of accuracy and precision are fundamental in scientific measurements. When it comes to a single measurement being considered precise or accurate, context is essential. Precision refers to the consistency of repeated measurements. Therefore, one isolated measurement cannot be labeled as 'precise' without additional data to compare it to. However, a single measurement can be considered accurate if it is very close to the true or accepted value. For instance, if you measure a piece of standard computer paper and it states that it is 11.0 inches long, if you measure it once and obtain 11.1 inches, that single measurement can be considered quite accurate, assuming the stated length is correct.

Nevertheless, precision is really about the reproducibility of multiple measurements, and accuracy concerns how close a measurement is to the true or accepted reference value. For instance, if you have a series of measurements showing 11.1 in., 11.2 in., and 10.9 in., these could be considered both accurate and precise, as they are close to the true value of 11.0 inches and to each other. Conversely, a single measurement of 12 inches would be neither accurate (not close to 11.0 inches) nor precise if the rest of the measurements are significantly different from 12 inches.

The balanced molecular equation for the given reaction is:

[tex]2CH_3COOH(aq) \ + \ Ba(OH)_2(aq) \rightarrow \ Ba(CH_3COO)_2(aq) + 2H_2O(l).[/tex]

To check that the equation is balanced count how many atoms are present for each element in the reactant and product side. If they are the same before and after reaction for all elements, then the reaction is deemed balanced.

The atom counting for the equation is shown below:

[tex]2CH_3COOH(aq) \ + \ Ba(OH)_2(aq) \rightarrow \ Ba(CH_3COO)_2(aq) + 2H_2O(l).[/tex]

Reactants                  →                 Products

C:  (2 x 2) =4                                  C: (2 x 2) = 4

H: (2 x 4) + (1 x 2) =10                    H: (3 x 2) + (2 X 2) = 10

O: (2 x 2) + (1 x 2) = 6                    O: (2 x 2) + (2 x 1) = 6

Ba: 1                                               Ba: 1

Since the number of atoms of each element are similar in the reactants and products, the equation is balanced.

To determine the state of the substances, consider their solubility.

The reactants are both aqueous (aq) as indicated in the problem.

The first product, [tex]Ba(CH_3COO)_2[/tex] is aqueous (aq) because based on the solubility rule, it will dissolve in water. Acetates are generally soluble.

The other product is water which will be liquid (l) since it is the solvent used to dissolve the substances.

Keywords: acid-base, neutralization, balancing equations, molecular equation

The balanced molecular equation for reaction of acetic acid and barium hydroxide is as follows:

[tex]\boxed{2\text{CH}_3\text{COOH}(aq)+\text{Ba(OH)}_2(aq)\rightarrow\left(\text{CH}_3\text{COO}\right)_2\text{Ba} (aq)+2\text{H}_2\text{O}(l)}[/tex]

Further Explanation:

Neutralization reaction:

This reaction occurs when acid and base react with each other and salt and water are formed. Since these reactions neutralize excess amount of hydrogen or hydroxide ions in the solution, it is named so.

Acetic acid is weak acid and barium hydroxide is strong base. Both react with each other to form salt and water and neutralization reaction takes place.

Chemical equations are written in following different types of equations:

In molecular equations, reactants and products are present in undissociated form. Total ionic equations involve all different types of ions involved in the reactions. But in net ionic equations, only useful ions are written.

In this reaction, [tex]\text{CH}_3\text{COOH}[/tex], reacts with [tex]\text{Ba(OH)}_2[/tex] to form [tex]\left(\text{CH}_3\text{COO}\right)_2\text{Ba}[/tex] and [tex]\text{H}_2\text{O}[/tex]. Here, [tex]\text{CH}_3\text{COOH}[/tex], [tex]\text{Ba(OH)}_2[/tex] and [tex]\left(\text{CH}_3\text{COO}\right)_2\text{Ba}[/tex] are present in aqueous phase while [tex]\text{H}_2\text{O}[/tex] is present in liquid phase. Unbalanced molecular equation becomes,

[tex]\text{CH}_3\text{COOH}(aq)+\text{Ba(OH)}_2(aq)\rightarrow\left(\text{CH}_3\text{COO}\right)_2\text{Ba} (aq)+\text{H}_2\text{O}(l)[/tex]

Number of atoms of all elements on both sides of reaction is written.

On reactant side,

Number of C atom is 1.

Number of H atoms is 6.

Number of Ba atoms is 1.

Number of O atoms is 4.

On the product side,

Number of C atom is 2.

Number of H atoms is 8.

Number of Ba atoms is 1.

Number of O atoms is 5.

Initially, atoms other than carbon, oxygen, and hydrogen are balanced by multiplying with some number on any side. Ba atoms are balanced on both sides. So carbon, hydrogen and oxygen atoms are balanced now. For this, [tex]\text{CH}_3\text{COOH}[/tex] is multiplied by 2 and [tex]\text{H}_2\text{O}[/tex] by 2. Now the balanced equation is as follows:

[tex]2\text{CH}_3\text{COOH}(aq)+\text{Ba(OH)}_2(aq)\rightarrow\left(\text{CH}_3\text{COO}\right)_2\text{Ba} (aq)+2\text{H}_2\text{O}(l)[/tex]

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Answer details:

Grade: High School

Subject: Chemistry

Chapter: Chemical reactions and equations

Keywords: chemical reactions, reactants, products, molecular equations, net ionic equation, CH3COOH, H2O, Ba(OH)2, (CH3COO)2Ba, Ba, O, H, C.