Repeating units in an organic compound are called
Monomers
Amino acids
Polymers
Hydrocarbons

Answer:

0.952 °C

Explanation:

The change in melting point is computed as:

ΔT = k*m*i

where ΔT is the difference between the melting point of water and of solution, k is a constant (1.86 °C*kg/mol for water), i is the van't Hoff factor (equal to 2 for sodium chloride because 2 ions are obtained after its dissolution), and m is the molality of the solution.

Molar mass of sodium chloride: 58.44 g/mol

Moles of of sodium chloride: mass / molar mass 3.5/58.44 = 0.059 mol

Density of water 1 kg/L

230 mL of water are equivalent to 0.23 L

mass of water: density * volume = 1*0.23 = 0.23 kg

Molality of the solution: m = moles of solute/ kg of solvent = 0.059/0.23 = 0.256

Finally:

ΔT = 1.86*0.256*2 = 0.952 °C

Water melting point: 0 °C

So, the solution melting point is: 0 - 0.952 = 0.952 °C

Answer:

The correct answer is option B.

Explanation:

Strong nuclear force is defined as strong force of an attraction which binds the quarks together to form a cluster of subatomic particles like protons and neutrons in the nucleus. This is the force which keeps the nucleus intact.

So, we can say that is an strong attractive force between the proton and neutron.

Answer:

B. A strong attractive force between protons and neutrons.

Explanation:

Correct answer for APEX quiz.

The correct formula for sodium hydroxide in the given word equation is NaOH.

The word equation provided is:

[tex]\[ \text{sodium oxide} + \text{water} \rightarrow \text{sodium hydroxide} \][/tex]

To represent this equation with chemical formulas, we need to know the formulas for each compound:

- Sodium oxide (Na2O) is an ionic compound composed of sodium ions (Na+) and oxide ions (O2-).

- Water (H2O) is a molecular compound composed of two hydrogen atoms and one oxygen atom.

- Sodium hydroxide (NaOH) is an ionic compound composed of sodium ions (Na+) and hydroxide ions (OH-).

The balanced chemical equation for the reaction is:

[tex]\[ \text{Na}_2\text{O} + \text{H}_2\text{O} \rightarrow 2\text{NaOH} \][/tex]

This equation shows that sodium oxide reacts with water to form sodium hydroxide. The formula for sodium hydroxide is NaOH, which consists of one sodium ion (Na+) and one hydroxide ion (OH-). The coefficient 2 in front of NaOH indicates that two moles of sodium hydroxide are produced for every mole of sodium oxide and water that react.

The concentration of the NaOH: 0.083 M

Titration is a procedure for determining the concentration of a solution by reacting with another solution which is known to be concentrated (usually a standard solution). Determination of the endpoint / equivalence point of the reaction can use indicators according to the appropriate pH range

Titrations can be distinguished including acid-base titration, depositional titration, and redox titration. An acid-base titration is the principle of neutralization of acids and bases is used.

An acid-base titration there will be a change in the pH of the solution.

From this pH change a Titration Curve can be made which is a function of acid / base volume and pH of the solution

Acid-base titration formula

Ma, Mb = acid base concentration

Va, Vb = acid base volume

na, nb = acid base valence

Neutralization Reaction:

NaOH + HCl ⇒ NaCl + H₂O

25.0 ml, 0.105 M HCl was titrated with 31.5 ml of NaOH

Acid-base titration formula

Ma Va. na = Mb. Vb. nb

a = HCl, b = NaOH (both have valence 1)

0.105 M. 25 = Mb. 31.5. 1

[tex]\rm Mb = \dfrac {0.105 \times 25} {31.5} \\\\ Mb = \boxed {\bold {0.083 \: M}}[/tex]

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Determine the endpoint of the titration.

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The electrochemical cell in the diagram is an electrolytic cell used for gold plating. Electroplating is an electrolytic process used to coat metal objects with a more expensive and less reactive metal. The metal to be plated is used as the anode and the electrolyte solution contains the ions of the metal to be plated.

In the diagram, the gold strip on the left is connected to the positive terminal of the battery and is anode. The aluminum glasses on the right is connected to negative terminal of the battery and is cathode. Anode is positive electrode and cathode is negative.

When the power is switched on, the electrolyte solution splits into ions. Positively charged Au³⁺ ions are attracted to the negatively charged cathode, aluminum glasses and slowly deposit on it. The negatively charged ions are attracted to positively charged anode, the gold strip and release electrons. The electrons move through battery towards the cathode.

Au goes into the solution at the anode and get reduced at the cathode, and is thus plated. A constant concentration of Au³⁺ is maintained in the electrolyte solution surrounding the electrodes.

Anode: Au(s) → Au³⁺(aq) + 3e-​ ............(oxidation)

Cathode: Au³⁺(aq) + 3e​- → Au(s) .........(reduction)

When 0.440 mol of aluminum react with excess chlorine gas, 0.440 mol of aluminum chloride are produced according to the 1:1 stoichiometric ratio in the balanced chemical equation.

When 0.440 mol of aluminum are allowed to react with an excess of chlorine gas (Cl2), to determine how many moles of aluminum chloride (AlCl3) are produced, we look at the stoichiometry of the balanced equation:

2 Al (s) + 3 Cl2 (g) → 2 AlCl3 (s)

This reaction shows that 2 moles of aluminum react with 3 moles of chlorine gas to produce 2 moles of aluminum chloride. Given the stoichiometry is a 1:1 ratio between aluminum and aluminum chloride, if you start with 0.440 mol of aluminum, you would end up producing 0.440 mol of aluminum chloride as well, provided chlorine is in excess.

The expanded structural formula for a three-carbon alkane is CH3-CH2-CH3, which represents propane (C3H8) following the general alkane formula CnH2n+2.

The expanded structural formula for an alkane with three carbon atoms is CH3-CH2-CH3. In the alkanes series, each molecule follows the general formula CnH2n+2, indicating that for three carbon atoms, the molecular formula is C3H8. Thus, the correct choice from the options provided is CH3-CH2-CH3, which is the condensed structural formula for propane.

Answer : The process in which sediment is dropped and comes to rest is called, Deposition.

Explanation:

Deposition : It is a type of process in which the molecules are settle down at the bottom of the container. In this process, there is no intermolecular space present between the atoms of molecule.

This process results in the formation of the sedimentary rocks which are made out of ice, wind and water flows which carry particles in the suspension.

Hence, the process in which sediment is dropped and comes to rest is called, Deposition.

Salt bridge is used to maintain the electrical neutrality in a cell as migration of ions from half cell to other half cell occurs to keep the balance in charges. In the absence of the salt bridge, the charges get imbalanced. After that, the cell stops working because ions will collected in both the electrolytes until the potential difference due to ions and potential difference from the reaction is just opposite to each other. Due to this, flow of electrons doesn't takes place and no current will flow.

Therefore, the function of salt bridge is to maintain the electrical neutrality in a cell.

When a nucleus undergoes nuclear decay by gamma rays the atomic number of the element remains unchanged

When a nucleus undergoes nuclear decay by gamma rays, the atomic number of the element remains unchanged. This type of decay involves the emission of high-energy gamma ray photons, which reduces the nucleus's energy state but does not alter the number of protons or neutrons.

For instance, an isotope in an excited state, such as technetium-99m, undergoes gamma decay to release a gamma photon and becomes technetium-99, but both have the same atomic number of 43.

The answer to your question is C.

Approximately 21.4 kJ of energy is needed to convert 64.0 grams of ice at 0.00°C to liquid water at the same temperature. This is calculated using the concept of 'enthalpy of fusion', which is the energy required to convert a substance from solid to liquid without changing its temperature.

To find out how much energy is needed to convert 64.0 grams of ice at 0.00°C to water at the same temperature, we should first understand that the melting of ice is an endothermic process, meaning it requires energy. The energy required to convert a substance from solid to liquid state without changing its temperature is termed the enthalpy of fusion.

For water, the enthalpy of fusion is 334 kJ/kg. However, our given mass is in grams, so we need to convert it to kilograms, thus we have 0.064 kg of ice. Using the formula Q=mLf (where Q is energy, m is mass, and Lf is the enthalpy of fusion), we can calculate the necessary energy: Q = (0.064 kg)(334 kJ/kg) = 21.376 kJ.

So, approximatley 21.4 kJ of energy is required to convert 64.0 grams of ice at 0.00°C into water at the same temperature.

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Answer:

Among the processes given i.e. Burning of candle, baking of bread, the reaction in a cold pack, and vaporization of water. The burning of the candle is an exothermic reaction.

Explanation:

The exothermic reactions are the ones in which there is an emission of energy.

In the baking of bread, the process grasps the energy and utilized it for the baking process. This is the form of an endothermic reaction.

The reaction of a cold pack for the treatment of injuries requires the heat from the surroundings and convert it to heat for recovery. So this requires energy and there is no loss in surroundings. It can't be the exothermic reaction.

The vaporization of water requires heat energy for transmission to the vapor state. This does not emit energy. This can't be the exothermic reaction.

The burning of Candle emits heat energy in the surroundings. This is considered an exothermic reaction.

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