4.Using their general formula, CnH2n-2 derive the molecular formula of the alkynes when n = 5, 6, 7, 8)


5.Write the condensed structural formula of the molecules in #4.

Sublevel 2s and 2p contains the valence electrons for nitrogen.

Answer:

Oxygen

Explanation:

Oxygen - p-block (group = 2, period = 16)

Rubidium - s-block (group = 5, period = 1)

Hydrogen - s-block (group = 1, period = 1)

Cobalt - d-block (group = 4, period = 9)

Answer: Oxygen  

Explanation:

The amount of water Yun has for experiment is 0.45 gram.

Given,

molar mass of water (H₂O) is 18.02 g/mol.

Yun has 0.025 mol of H₂O

we have to find out amount of water she has for her experiment

number of moles of water = given mass of water / molar mass of water

mass of water = number of moles of water × molar mass of water

= 0.025 × 18.02

= 0.45 gram

Therefore, Yun has 0.45 gram of water for experiment.

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Answer:

options B,C and E are correct conditions for forming hydrogen bonds.

Explanation:

In order for particles to stick together or shows certain characteristics, there must be a bond of attractions that is making them to be able to stay together. Some of these attractions are strong while some are weak. The kind of attraction that is being considered in this question  is the hydrogen  bonding which is considered as part of the weak forces of attractions.

In order for hydrogen bonds to occur, there must be hydrogen atoms [option B is correct] and a much more electronegative elements such as oxygen, Fluorine and Nitrogen. Hence, option C is correct.

Since the Fluorine or oxygen or nitrogen have much more electronegative properties than hydrogen, it causes a partial negative charge on  Fluorine or oxygen or nitrogen and a partial positive charge on the Hydrogen. Thus, option E is correct.

Answer:

MgO

Explanation:

A reaction that looks to follow second-order kinetics but is not actually a second-order reaction is described by the pseudo-second order (PSO) model.

A chemical reaction that looks to follow second-order kinetics but is not actually a second-order reaction is referred to as pseudo second order (PSO) in a kinetic model.

It is frequently seen in reactions where one reactant's concentration is substantially higher than that of the other reactant, resulting in an abundance of the abundant reactant that remains essentially constant throughout the reaction.

The rate equation in PSO kinetics has the following structure:

1/t = k * [A] * [B]

where [A] and [B] stand for the reactant concentrations, k for the rate constant, and t for the passage of time. According to the equation, the rate of the reaction is inversely proportional to the product of the reactant concentrations.

The consumption of the limiting reactant, which determines the total reaction rate, is what causes the apparent second-order behaviour. The rate of the reaction falls together with the concentration of the limiting reactant with time.

Adsorption reactions, surface reactions, or situations where one reactant is present in excess of the other are frequently described by the PSO model. The PSO model is an approximation and does not imply a real second-order reaction mechanism, it is vital to remember this.

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A spontaneous reaction is a reaction that favors the formation of products at the conditions under which the reaction is occurring.

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Answer:

A. Draw a conclusion

Explanation:

correct me if I'm wrong :>

Answer:

v = 17.6cm³

Explanation:

Given data:

density of lead = 11.342 g/cm³

Volume of lead = ?

Mass of lead = 200.0 g

Solution:

Formula:

Density = mass/volume

by putting values,

11.342 g/cm³ = 200.0 g/ v

v = 200.0 g/11.342 g/cm³

v = 17.6cm³

The density of lead is 11.342 g/cm³. 17.6cm³ would be the volume of a 200.0 g sample of this metal.

The density of a substance indicates how dense it is in a given area. Mass / unit volume is the definition of a material's density. In essence, density is a measurement of how closely stuff is packed. It is a particular physical characteristic of a specific thing. The Greek scientist Archimedes made the discovery of the density principle. If you are familiar with the formula and the relevant units, calculating density is simple. The letter D can also be used to signify density instead of the symbol.

Density = mass/volume

11.342 g/cm³ = 200.0 g/ v

v = 200.0 g/11.342 g/cm³

v = 17.6cm³

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The methyl orange indicator will change from red to yellow at the titration's endpoint.

An acid-base indicator called methyl orange changes color between the pH ranges of 3.1 and 4.4. In acidic and basic solutions it is red and yellow, respectively

In this instance, an acid, hydrochloric acid, is being used to titrate the barium hydroxide solution. The pH of the solution will fall as we add the acid since it will neutralize the base. The hue of the methyl orange indicator will vary when the pH ranges from 3.1 to 4.4

All of the barium hydroxide will have interacted with the hydrochloric acid by the time the titration is complete leaving a neutral solution. When the methyl orange indicator becomes yellow the solution's pH is in the basic range.

Therefore, the methyl orange indicator will change from red to yellow at the titration's endpoint.

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Answer:

3.37 cm

Step-by-step:

The edge length of the titanium cube can be calculated using the formula:

Edge length = (Volume of cube)^(1/3)

And the volume of the cube can be calculated as follows:

1. Calculate the mass of the titanium atoms in the cube.

The mass of one titanium atom can be calculated by dividing the molar mass of titanium by Avogadro's number:

Mass of one titanium atom = Molar mass of titanium / Avogadro's number

= 47.867 g/mol / (6.022 × 10^23 atoms/mol)

= 7.943 × 10^-23 g/atom

The total mass of the titanium atoms in the cube is then:

Total mass of titanium atoms = (2.23 × 10^24 atoms) × (7.943 × 10^-23 g/atom)

= 1.773 × 10^2 g

2. Calculate the volume of the titanium cube.

The volume of the cube can be calculated by dividing the total mass of the titanium atoms by the density of titanium:

Volume of cube = Total mass of titanium atoms / Density of titanium

= 1.773 × 10^2 g / 4.50 g/cm^3

= 39.4 cm^3

3. Calculate the edge length of the titanium cube.

Finally, the edge length of the cube can be calculated as:

Edge length = (Volume of cube)^(1/3)

= (39.4 cm^3)^(1/3)

= 3.37 cm

So the edge length of the titanium cube is 3.37 cm, rounded to three significant figures.

Hope this helps!

Evolution can be defined as the change in genetic of any population over time.

1. An adaptation is any heritable trait that helps an organism, such as a plant or animal, survive and reproduce in its environment.

2. Evolution is a process that results in changes in the genetic material of a population over time.

3. Natural selection, organisms that possess heritable traits that enable them to better adapt to their environment compared with other members of their species will be more likely to survive, reproduce, and pass more of their genes on to the next generation.

4. Charles Darwin is known as the father of evolution.

5. Darwin postulated that the beak of an ancestral species had adapted over time to equip the finches to acquire different food sources.

6. When a trait is expressed in more than one way, such as the different colours of the beetles, it is called variation.

7. A queen honeybee can lay up to 2000 eggs in one day. this is an example of overproduction of offspring.

8.  In human beings, eye colour, eyebrows, earlobe size, and the ability to curl one's tongue are nonadaptive traits.

9. A dragonfly wing is the homologous structures.

10. Years of selective breeding by humans has resulted in the artificial "evolution" of dogs into many different types.

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5.1 grams of Cl2 is calculated as 1.610 L.  As all the gases that behave ideally have the same number density, they will also have the same molar volume.

Molar volume of a substance is the volume occupied by one mole of  substance at given temperature and pressure. It is equal to the molecular mass of the substance divided by its density at the given temperature and pressure: It has SI unit of cubic meters per mole.

Given 5.1 grams of Cl2

As molar mass of Cl2 = 70.906 g/mol

So, moles = 5.1/70.906

= 0.0719 mol

Volume= moles of cl2 * molar volume of cl2

As molar volume of cl2 = 22.40 L

So, Volume = 0.0719 * 22.40

Volume = 1.610 L

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Answer:

\([Ag^+]=2.82x10^{-4}M\)

Explanation:

Hello there!

In this case, for the ionization of silver iodide we have:

\(AgI(s)\rightleftharpoons Ag^+(aq)+I^-(aq)\\\\Ksp=[Ag^+][I^-]\)

Now, since we have the effect of iodide ions from the HI, it is possible to compute that concentration as that of the hydrogen ions equals that of the iodide ones:

\([I^-]=[H^+]=10^{-3.55}=2.82x10^{-4}M\)

Now, we can set up the equilibrium expression as shown below:

\(Ksp=8.51x10^{-17}=(x)(x+2.82x10^{-4})\)

Thus, by solving for x which stands for the concentration of both silver and iodide ions at equilibrium, we have:

\(x=[Ag^+]=2.82x10^{-4}M\)

Best regards!

Answer:

2.03 × 10⁻⁵ M

Explanation:

Step 1: Given data

Concentration of Pb(NO₃)₂: 6.73 ppm = 6.73 mg/L

Step 2: Convert 6.73 mg/L to mol/L

The molar mass of 331.2 g/mol.

6.73 × 10⁻³ g/L × 1 mol/331.2 g = 2.03 × 10⁻⁵ mol/L = 2.03 × 10⁻⁵ M

Step 3: Calculate the molar concentration of Pb²⁺

Let's consider the ionization of Pb(NO₃)₂.

Pb(NO₃)₂(aq) ⇒ Pb²⁺(aq) + 2 NO₃⁻(aq)

The molar ratio of Pb(NO₃)₂ to Pb²⁺ is 1:1. The molar concentration of Pb²⁺ is 1/1 × 2.03 × 10⁻⁵ M = 2.03 × 10⁻⁵ M.

Answer: Microphones are a type of transducer - a device which converts energy from one form to another. Microphones convert acoustical energy (sound waves) into electrical energy (the audio signal). Different types of microphone have different ways of converting energy but they all share one thing in common! Furthermore, Example 1: Crushing a can.

Type of change:

Developmental – May be either planned or emergent; it is first order, or incremental. ...

Transitional – Seeks to achieve a known desired state that is different from the existing one. ...

Transformational – Is radical or second order in nature.

The current passing through the electrolytic cell is approximately 2.02 x 10^4 Amperes.

To calculate the current in amperes, we need to use Faraday's laws of electrolysis and the stoichiometry of the reaction.

Faraday's laws state that the amount of substance produced or consumed during electrolysis is directly proportional to the quantity of electricity passed through the cell. The relationship is given by:

Q = nF

Where Q is the electric charge in coulombs (C), n is the number of moles of substance involved in the reaction, and F is Faraday's constant, which is equal to 96,485 C/mol.

In this case, the substance being produced is Cl2, and we know the mass of Cl2 produced, which is 4.8 x 10^5 g.

First, we need to calculate the number of moles of Cl2 produced:

Molar mass of Cl2 = 35.45 g/mol

Moles of Cl2 = mass / molar mass = (4.8 x 10^5 g) / (35.45 g/mol) ≈ 1.354 x 10^4 mol

Now we can calculate the quantity of electricity passed through the cell using Faraday's laws:

Q = nF

Q = (\(1.354 x 10^4\)mol) * (96,485 C/mol)

Q ≈ 1.308 x 10^9 C

The quantity of electricity is given in coulombs. To find the current, we need to divide this value by the time in seconds.

Given that the time is 18 hours, we convert it to seconds:

Time = 18 hours * 60 minutes/hour * 60 seconds/minute

Time = 6.48 x 10^4 seconds

Finally, we can calculate the current:

Current (I) = Q / Time

I = (1.308 x 10^9 C) / (6.48 x 10^4 s)

I ≈ 2.02 x 10^4 Amperes

Therefore, the current passing through the electrolytic cell is approximately 2.02 x 10^4 Amperes.

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Answer:

gas

Explanation:

Answer:

Explanation:

1.1 we have to find mass of Na3PO4;

for that we have to Calculate the moles of Na3PO4 needed:

volume is 100mL = 0.1L

Molar concentration = Moles of solute / Volume of solution in L

0.1 mol/L = Moles of Na3PO4 / 0.1 L

Moles of Na3PO4 = 0.1 mol/L * 0.1 L

Moles of Na3PO4 = 0.01 mol

Now, Calculate the mass of Na3PO4 needed:

so, Mass = Moles of Na3PO4 * Molar mass of Na3PO4

Mass = 0.01 mol * 164 g/mol

Mass = 1.64 g of Na3PO4.

1.2 materials and glassware needed:

1.64 g Sodium phosphate (Na3PO4)

100 mL volumetric flask

weighing balance

Distilled water

Glass rod

Pipette and burette

Explanation:

this explanation may help u to understand:)

The correct statement is C. When the concentration of the reactant decreases, the cell potential decreases.

The cell potential, also known as the electromotive force or voltage, is a measure of the tendency of a redox reaction to occur. It is directly related to the concentrations of the reactants and products involved in the reaction. According to the Nernst equation, which describes the relationship between cell potential and reactant concentrations, a decrease in the concentration of a reactant leads to a decrease in the cell potential. In a redox reaction, the reactants undergo oxidation and reduction processes. The reactant that is being oxidized is called the oxidizing agent, while the reactant that is being reduced is called the reducing agent. The concentrations of these species affect the reaction rates and, subsequently, the cell potential. When the concentration of the reactant decreases, the reaction rate of the oxidizing agent or the reducing agent decreases. This imbalance in reaction rates disrupts the equilibrium of the redox reaction, resulting in a decrease in the overall cell potential. This decrease occurs because there is less availability of the reactant to participate in the reaction and contribute to the electron transfer process. It is important to note that the concentration of the reactant on its own does not determine the cell potential. Other factors such as the nature of the reactants, temperature, pressure, and electrode potentials also influence the overall cell potential. However, in isolation, when the concentration of the reactant decreases, the cell potential will generally decrease as well.

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The mass of nitrogen monoxide is 1.54 g.

In this case we have to make use of stoichiometry to obtain the mass of the NO that is produced in the reaction. The balanced reaction equation is;

\(4NH_{3} (g) + 5O_{2} (g) ---- > 4NO(g) + 6H_{2} O(g)\)

Mass of ammonia= 1.55 g

Number of moles of ammonia =  1.55 g/17 g/mol = 0.088 moles

Mass of oxygen =  2.05 g

Number of moles of oxygen =  2.05 g/32 g/mol = 0.064 moles

If 4 moles of ammonia reacts with 5 moles of oxygen

0.088 moles of ammonia reacts with 0.088 moles *  5 moles/ 4 moles

= 0.11 moles

Hence oxygen is the limiting reactant.

If 5 moles of oxygen produces 4 moles of nitrogen monoxide

0.064 moles of oxygen produces 0.064 moles * 4 moles / 5 moles

= 0.0512 moles

Mass of nitrogen monoxide = 0.0512 moles * 30 g/mol = 1.54 g

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Answer:

We need more? What else is in the question? This is unanswerable.

Explanation:

Answer:

0.375 moles

Explanation:

no of moles =vol×molarity

Derivate planar density expressions for FCC(100) and (111) is 1/4R² and 4R²√3, number of  atoms are centered on the [100] in FCC is 4.

Atoms can be arranged either closely or widely together. A periodic three-dimensional pattern of atoms is packed into crystalline solids like metals. Atoms are not subject to periodic packing in non-crystalline materials like silicon oxide. A unit cell is a crystal structure's fundamental building block. The packing density of crystals is measured by planar density.

For (100) plane one atom at each of  four cube corners

,each of which is shared with four adjecent unit cells.

Centre atom lies with in the unit cell.

Thus there is the equivalence of 2 atoms associated with this FCC(100) plane.

The plannar section in the above figure is square.

Where

The side lengths are equal to unit cell edge length = 2R√2

Area of the square =( 2R√2 )2

                            =8R2

a) So plannar density of (100) plane

PD (100)plane =(number of atoms centerd at (100) plane)  / (area of plane)

                    = (2) / 8R2

                    =1 / 4R2

∴Plannar density of  FCC(100) is 1 / 4R2.

b) There are 6 atoms whose centre lie on this plane .

Total  equivalence is 2 atoms associated with this FCC(111) plane at centered.

In above diagram

 (2R)2 + h2 = 4R2

which leads to h = 2R√3

Thus Area =4(R) (h) /2

                 =4(R) (2R√3) /2

                 =4R2√3

PD (111)plane =(number of atoms centerd at (111) plane)  / (area of plane)

                    =(2) / 4R2√3

                     =1/ (2R2√3)

∴Plannar density of  FCC(111) is 1/ (2R2√3).

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Answer:n a  red blood cell, the control center is the nucleus. A mitochondria is not a nucleus. It is another organelle that produces energy for the cell.

Explanation: