1. Explain why the lattice disassociation enthalpy of magnesium chloride is greater than that of calcium chloride

2. Explain why the lattice disassociation enthalpy of magnesium oxide is greater than that of magnesium chloride

Answer:

Square

Explanation:

A square is a quadrilateral with r sides the same length

This indicates that the equilibrium state of the reaction—also referred to as an unfavourable equilibrium—favors the reactants.

The reaction mechanism might be one explanation for this. Reactants may build up before the equilibrium state is reached if the reaction has a slow step. The reaction's stoichiometry, in which the ratio of products to reactants is not ideal for product formation, may also be a factor.

Reactant concentrations can be lowered or product concentrations can be raised to tip the equilibrium in favor of product formation. Altering the reaction conditions, such as temperature or pressure, can also encourage the formation of the desired product.

Overall, a number of variables, such as the reaction mechanism, stoichiometry, and reaction conditions, affect the concentrations of reactants and products at equilibrium.

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Answer:

Heat Capacity = E / T.

- Find the difference in temperature for changes of multiple degrees.

- Add the appropriate units to your answer to give it meaning.

- Know that this equation works for cooling objects as well.

- Know that specific heat refers to the energy needed to raise one gram by one degree.

Answer: conjugate base of a weak acid

Explanation: If the anion is a conjugate base of a weak acid, the solution would be basic. This is because weak acids do not produce enough hydrogen ions in the solution so does not really affect the acidity, so the conjugate base can react with water in the solution to produce a basic solution.

Answer:

because a 24Mg atom has 12 neutrons in its nucleus

Answer:

There are light absorbing color bodies called chromophores that are present in dyes. Ultraviolet rays are one of the causes of fading because they can break down chemical bonds and fade the color in objects.

Answer:

129.02 g/mol.

Explanation:

We apply grahams law of diffusion:

1/8 = √2.016/√m     where m = molar mass

√m  = 8√2.016

m =   (8√2.016) = 129.02 g/mol.

Sodium sulfite added to the reaction mixture in this week's haloform reaction experiment  to reduce any excess bleach.

Option A is correct .

The reaction mixture in this week's haloform reaction experiment, sodium sulfite is added to reduce any excess bleach.Bleach (NaOCl) is added to the reaction mixture of iodine and acetone in the haloform reaction experiment to oxidize iodine to triiodomethane (CHI₃).

The following equation represents the reaction that occurs when acetone, iodine, and NaOCl (bleach) are mixed together:

{3I₂ + CH₃COCH₃ + NaOCl -> CHI₃ + CH₃COONa + 2HCl}

The bleaching agent (NaOCl) may oxidize the triiodomethane (CHI₃) produced by the reaction. Triiodomethane is volatile and can be detected by the smell of iodoform.

Sodium sulfite (Na₂SO₃) is added to the reaction mixture to prevent oxidation of triiodomethane by any excess bleach.

Incomplete question :

Why is sodium sulfite added to the reaction mixture in this week's haloform reaction experiment?

A. to reduce any excess bleach

B. to react with any excess hydroxide

C. to oxidize any excess bleach

D. to acidify the reaction mixture

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Answer:

Explanation:

The percentage error of a certain measurement can be found by using the formula

\(P(\%) = \frac{error}{actual \: \: number} \times 100\% \\ \)

From the question

actual density = 7.80 g/cm³

error = 7.30 - 7.80 = 0.5

We have

\(p(\%) = \frac{0.5}{7.8} \times 100 \\ = 6.410256...\)

We have the final answer as

Hope this helps you

Answer:

In the elemental form, non-metals can be gas, liquid or solid. They aren't shiny (lustrous) and they don't conduct heat or electricity well. Usually their melting points are lower than for metals, although there are exceptions. The solids usually break easily, and can't bend like metals

Explanation:

An indicator is added during an acid-base titration to visually indicate the endpoint of the titration. The endpoint is the point at which the acid and base have completely reacted with each other in stoichiometric amounts, resulting in a neutral solution.

During the titration, the acid and base are gradually added to each other until the endpoint is reached. At this point, the indicator changes color, indicating that the neutralization reaction is complete and the titration can be stopped.

The purpose of adding an indicator is to make it easier to determine the endpoint of the titration. Without an indicator, it can be difficult to determine when the neutralization reaction is complete. The indicator changes color at or very near the endpoint, providing a clear visual signal that the reaction is complete.

Different indicators are used depending on the type of acid-base titration being performed. For example, phenolphthalein is commonly used as an indicator in acid-base titrations because it changes color in the pH range of 8.2 to 10, which is near the endpoint of many acid-base titrations.

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Answer:

the correct answer is D

Explanation:

D

The diagram which shows the correct way to represent the ionic compound, magnesium oxide is option D.

Electron dot structure is a representation of the valence electrons of an element, represented by the dots around the symbol of the element.

An ionic compound is formed by the combination of two or more ions. Note that the two ions that compose an ionic bond are held purely by electrostatic interaction of the oppositely charged ions.

The correct depiction of MgO is the arrangement in which the two ions, \(Mg^{2+}\) and \(O^{2-}\) are placed in different brackets and the oxygen ion has a complete octet as seen in option D.

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Answer:

1234.56 MILLIGRAMS =0.00123 KILOGRAMS

Answer:  When a liquid becomes a solid what happens to the atoms in the solid?

The particles (atoms or molecules) are attracted to each other. The particles (atoms or molecules) vibrate but do not move past one another. The solid retains its shape.

Explanation:

The atoms in a liquid have more energy than the atoms in a solid. There is a special temperature for every substance called the melting point. When a solid reaches the temperature of its melting point, it can become a liquid. Where the Atoms vibrate but still stick together, not moving past, behind, etc of where they are.

Answer:

Dmitri Mendeleev

Explanation:

Dmitri Mendeleev a Russian Chemist arranged elements on the periodic table according to their atomic mass. He used this arrangement to predict some of the properties of the missing element.

The mass of carbondioxide that will be produced from the reaction of 37.5g of C₂H₆ is 110 grams.

Stoichiometry is the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations).

According to this question, ethane reacts with oxygen to produce carbondioxide and water as follows:

2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O

Based on the above reaction, 2 moles of ethane produces 4 moles of carbondioxide

37.5g of ethane = 1.25moles of ethane

moles of carbondioxide = (1.25 × 4) ÷ 2 = 2.5 moles

mass of carbondioxide = 2.5mol × 44g/mol = 110grams of carbondioxide.

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although Edie had thought about quitting in the past , now she felt that she would stay forever

Answer:

Although Edie had thought about quitting in the past, now she felt that she would stay forever.

Answer:

2,400,000 torr (3 s.f.)

Explanation:

Convert the pressure from Pascal to atm first:

\(\boxed{1 \: atm = 101325 \:Pa }\)

3.20 ×10⁸ Pa

= [(3.20 ×10⁸) ÷101325] atm

= 3158.2 atm (5 s.f.)

Convert atm to torr:

\(\boxed{1 \: atm = 760 \: torr}\)

3158.2 atm

= (3158.2 ×760) torr

= 2400000 torr (3 s.f.)

The mass, density, and volume of an object are crucial factors in determining its sinking or floating behavior. Conducting a lab to measure the density of an object and test its buoyancy allows us to investigate this phenomenon. The lab involves testing a hypothesis regarding the sinking and floating of objects based on their density.

In the lab, the density of an object is measured, and then its buoyancy is determined to ascertain whether it will sink or float. The hypothesis states that an object with lower density will sink, while an object with higher density will float. This hypothesis can be tested by employing methods such as dropping a ball or marble into a tank of water.

By conducting the experiment and observing the results, we can evaluate whether the obtained data supports or contradicts the hypothesis. If the results align with the hypothesis, it provides evidence in favor of the hypothesis, reinforcing our understanding of the sinking and floating behavior based on density.

In the event of repeating the lab, it is essential to improve the quality of data by identifying and rectifying any errors made during the initial experiment. This iterative approach ensures the success of the lab and enhances the accuracy of the results, reinforcing the support for the hypothesis.

Understanding the concepts of mass, density, and volume is crucial for analyzing whether an object will sink or float. Conducting a lab to measure the density and test buoyancy helps in examining the relationship between these properties. By formulating a hypothesis and conducting experiments, we can gather data to support or challenge the hypothesis, allowing for a deeper understanding of sinking and floating phenomena.

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Answer:

522 Kilometers per Hour

Explanation:

Hi there! :)

Answer:

\(\huge\boxed{522 km/hour}\)

\(\text{Express 145 m/s as a fraction:} \frac{145m}{s}\)

\(\text}Convert to km/hour by multiplying by the equivalents in terms of meters and seconds to cancel out the units}\)

\(\frac{145m}{sec} * \frac{3600 sec}{1 hour} * \frac{1 km}{1000 m} = \\\\\text {Cross out similar units and multiply the coefficients:}\\\\\frac{145 * 3600 * 1km}{1 * 1hour * 1000} = \frac{522000km}{1000hour}= 522 km/s.\)

Answer:

which parts electrical charges you are asking ??

Considering the chemical and physical properties of elements, the elements can be arranged into groups in the periodic table as follows:

Group 1 to 3 - metals

Group 14 - non-metals, metalloids, and metals

Group 15 to 18 - non-metals

Groups of elements refer to vertical columns or families that contain elements with similar chemical properties.

Each group in the periodic table has distinct properties and trends. For example:

These are just a few examples of the groups in the periodic table, and each group exhibits unique chemical properties and trends.

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The dispersion and mixing of particles would be made easier through the application of ultrasonic waves.

Ultrasonic waves can facilitate the dispersion and mixing of particles in an experimental procedure. When ultrasonic waves are applied, they generate high-frequency sound waves that create alternating compression and rarefaction waves in a liquid medium.

These waves produce tiny bubbles due to the phenomenon of cavitation. During cavitation, the bubbles rapidly expand and collapse, creating localized areas of high pressure and temperature.

This process exerts mechanical forces on the surrounding particles, leading to their effective dispersion and mixing. The energy from ultrasonic waves helps to break down agglomerates, disperse fine particles, and enhance the overall homogeneity of the mixture.

The application of ultrasonic waves can be particularly beneficial in procedures such as sample preparation, emulsification, dispersion of nanoparticles, and dissolution of substances. It improves the efficiency and effectiveness of processes that require uniform distribution and thorough mixing of components.

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The given examples depict law of reciprocal proportions.

Jeremias Ritcher put forward the law of reciprocal proportions in 1792. The ratio of the masses in which they do so is either the same or a simple multiple of the mass ratio in which they combine, according to the statement, "If two different elements combine independently with the same weight of a third element."

a. Metal oxide contains

M = 0.46 g.

O = 0.77−0.46 = 0.31 g

Therefore, weight of oxygen that combines with 1g of

Metal = 0.31/0.46 = 0.674 g

b. 0.82g of Metal liberates H₂ = 0.00009 × 760 = 0.068g

Thus, the weight of H₂ that will be liberated by 1g of

Metal = 0.068/0.82 = 0.083 g

According to (a) and (b) the ratio of the weight of O:H that combine with or is displaced by the same weight of metal is 0.674:0.083 or 8:1.

Again according (c ), 1.25g of water contains

O= 1.12g and

H 1.25 − 1.11 = 0.14g

Therefore, The ratio of O:H::1.11:0.14 or 8:1

Hence, that ratio being the same, the law of reciprocal proportions is illustrated.

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The mass of the copper with a volume of 9.5 mL is approximately 84.74 g. Among the given options, the closest value to 84.74 g is option B) 85 g.

To calculate the mass of the copper, we can use the formula:

mass = density × volume

Given that the density of copper is 8.92 g/mL and the volume of the copper is 9.5 mL, we can substitute these values into the formula:

mass = 8.92 g/mL × 9.5 mL

Calculating the mass:

mass = 84.74 g

Therefore, the mass of the copper with a volume of 9.5 mL is approximately 84.74 g.

Among the given options, the closest value to 84.74 g is option B) 85 g.

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One of the following is an Arrhenius base NH2OH. The correct option is B.

The Arrhenius base is the compound that gives -Oh ions in the water after dissociation of the electrolyte. For example NaOH, KOH, NH4OH, etc.

Arrhenius base and acids can also explain the neutralization of the reaction and give information about the hydronium ion in water.

Therefore, The correct option is B. One of the following is an Arrhenius base NH2OH.

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Transition metals are much stronger and denser than alkali metals and alkaline earth metals and it is located between group 2 and group 3 of the periodic table.

Alkali metals and alkaline earth metals form ions with a +1 charge while the transition metals can form ions with variable charges. The transition metals are much harder, stronger and denser. They have much higher melting points . The transition metals are much less reactive. The alkali metals react with water, oxygen and halogens while the transition metals either react very slowly or do not react at all. A group 1 of the periodic table that is alkali metal will tarnish in the presence of oxygen as a metal oxide is formed. When cut with a knife the shiny appearance of the metal disappears in seconds as it is covered by the dull metal oxide.

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