Which one is NOT true about chemical changes? *

Answer:

\(2Na+Cl_2 \rightarrow 2NaCl\)

Explanation:

When sodium combines with chlorine, it will form sodium chloride.

The equation is :

\(Na+Cl_2 \rightarrow NaCl\)

The balanced equation is :

\(2Na+Cl_2 \rightarrow 2NaCl\)

Hence, the above equation shows the balanced equation when sodium combines with chlorine to form sodium chloride.

As a result, the 50 gramme sample's estimated end temperature is around 37.57°C.

The amount of energy in a system that is available to perform beneficial work at a constant temperature is shown by the Helmholtz free energy equation, often known as the thermal equilibrium equation (F = U - TS). The Helmholtz free energy (F), internal energy (U), absolute temperature (T), and entropy are the variables in the Helmholtz equation (S).

Two items are said to have the same temperature when they are in thermal equilibrium. Heat, a kind of energy, is transmitted between the objects as they approach thermal equilibrium.

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Answer:

it will be 4:00 pm

Explanation:

subtracting eight hours from Coordinated

Answer:

Calcium carbonate is an ionically bonded compound.

Covalent Bond: This bond is formed because atoms share a pair of electrons through an orbital.

The new volume of the balloon after heating it to a temperature of 51 °C is approximately 2.39 L.

Charles's law states that "the volume occupied by a definite quantity of gas is directly proportional to its absolute temperature.

It is expressed as;

\(\frac{V_1}{T_1} =\frac{V_2}{T_2}\)

Given that:

Substituting the given values and solve for V₂:

\(V_1T_2 = V_2T_1\\\\V_2 = \frac{V_1T_2}{T_1} \\\\V_2 = \frac{2.2\ *\ 324.15}{298.15 }\\ \\V_2 = 2.39 \ L\)

Therefore, the final volume is 2.39 litres.

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Answer:

Decomposition.

Explanation:

Decomposition Reactions T hose reactions in which a single substance (reactant) splits up into two or more simpler substances (products) are known as decomposition reactions. These reactions are carried out by supplying energy in form of heat, electricity or light which breaks that substance into simpler substances

Answer:

Object C

Explanation:

The object experiencing the greatest gravitational force is C.

This choice is made based on the newton's law of universal gravitation.

It states that "every particle attracts every other particle with a force that is directly proportional to their mass and inversely proportional to the square of the distance between them".

  From the law, we understand that the higher the mass, the higher the force of gravitation.

 The force is inversely proportional to the distance between the two bodies, so, the larger the distance the lesser the force.

From the given choices, mass 5kg of two bodies and distance 1m will yield the greatest gravitational force.

The pair of objects at 1 m distance and 5 kg mass have been experiencing the greater gravitational force. Thus, option C is correct.

Gravitational force has been the force acting on the body with the influence of gravity.

According to the Newton's law of the gravitational force, the force has been directly proportional to the mass of the object and has been inversely proportional to the square root of the distance between the object.

In the given set of objects, the objects with least distance and greater mass have been experiencing the higher gravitational force.

Thus, objects at 1 m distance and 5 kg mass have been experiencing the greater gravitational force. Thus, option C is correct.

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Answer:

so for every 1 kg it's 10 to the three. So we multiply 5.84 times 47.867 divided by 10 to the three, which is just 1000. Doing that should give you 0.280 kg of titanium.

Explanation:

The mass of 5.84 moles of titanium (Ti) is 0.279 kg.

Moles can be defined as the amount of substances present in a system that contain the same number of entities as the number of atoms in 12g of carbon 12.

Given moles of Titanium = 5.84 moles

Molar mass of Titanium = 47.867 g

Mass = Moles x Molar mass

Mass of Titanium = 5.84 x 47.867

= 279.54g

To convert in kgs = 279.54 / 1000

= 0.279kg

Hence, the mass of 5.84 moles of titanium (Ti) is 0.279 kg.

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Answer:

IHD = 0; no unsaturation in the formula

Explanation:

The IHD is also known as the degree of unsaturation formula. This formula is commonly used to get an idea of how many unsaturations a molecule has, and in this way, we can get an approach of the type of compound we are treating. For example, if this number is 1, it means that the compound has at least one unsaturation and it could be a double bond or just cyclical compound.

The IHD is calculated using the following expression:

IHD = (a + 1) - (b + x - c)/2   (1)

Where:

a: number of carbon

b: number of hydrogens

c: humber of nitrogens

x: number of halogens.

Now, we have the formula C₄H₉Cl, let's identify a, b, c and x:

a: 4 carbons;  b = 9 hydrogens;  C = none;   X: 1 chlorine

Replacing in (1) we have:

IHD = (4+1) - (9+1)/2

IHD = 5 - (10/2)

So this number is 0, which means that the molecule does not have any kind of unsaturation (Non double bond, multi bond or cyclical).

Hope this helps

Answer:

The air moves to the low pressure system creating wind.

Hope this helps! :)

Answer:

see explanations

Explanation:

              PCl₅  =>     PCl₃     +     Cl₂

C(eq):   [PCl₅]       0.054M        0.34M

a.  Keq = [PCl₃][Cl₂]/[PCl₅]

b.  7.9 = (0.054)(0.34)/[PCl₅] => [PCl₅] = (0.054)(0.34)/(7.9) = 0.0023M

c.  If [PCl₃] = 0.054M; [Cl₂] = 0.34M and [PCl₅] = 0.0023M then the reaction is at equilibrium and will not shift forward or in reverse. In order to determine if reaction is not at equilibrium, a set of concentration values needs to be given in problem, used to calculate Qeq and compared to the given Keq value.  The following defines direction of shift ...

Keq  <  Qeq  =>  rxn shifts left

Keq  =  Qeq  =>  rxn is at equilibrium (no shift)

Keq  >  Qeq  =>  rxn shifts right

NOTE: If Keq is listed first followed by Qeq in the above conditions, the inequality symbol indicates direction of shift.

There are approximately 1.765 x 10²³ molecules of KCl in 21.89 grams of KCl.

Potassium chloride (KCl) is a compound made up of potassium and chloride ions. It is a colorless, odorless salt that is commonly used in a variety of applications.

Molar mass of KCl is 74.55 g/mol; number of moles = Mass/ Molar mass

So, the number of moles = 21.89 g ÷ 74.55 g/mol = 0.2936 mol

and the number of molecules = Number of moles * Avogadro's number

Number of molecules = 0.2936 mol x 6.02 x 10²³ molecules/mol

Number of molecules = 1.765 x 10²³ molecules

Therefore, there are approximately 1.765 x 10²³ molecules of KCl in 21.89 grams of KCl.

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It is the least reactive of the three elements listed.  The correct order of elements from most to least reactive is:

sodium, carbon, krypton.

Sodium is a highly reactive metal and readily forms compounds with many other elements. It reacts vigorously with water and air, which is why it is stored in oil to prevent contact with moisture or oxygen.

Carbon is less reactive than sodium but can still undergo reactions, such as combustion or oxidation. Krypton, on the other hand, is a noble gas and is chemically inert, meaning it does not react with other elements under normal conditions. Therefore, it is the least reactive of the three elements listed.

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Diamonds are composed of carbon in a tetrahedral lattice. That is option C.

A diamond of defined as an allotrope or one of the major forms of the element, carbon in nature.

These carbon atoms are arranged within the diamond in a face centered cubic tetrahedral lattice shape.

Therefore, Diamonds are composed of carbon in a tetrahedral lattice.

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Diamonds are composed of carbon in a tetrahedral lattice. The correct option is C.

Diamonds are one of the allotropes of carbon. The other allotrope of carbon is graphite.

Thus, diamonds are made up of carbon atoms that are tightly packed together. Each carbon atom in a diamond is strongly bonded to 4 other carbon atoms, resulting in the formation of a tetrahedral structure.

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Answer:

it defuse at a rate of 0.0002 m/s

Answer:

plants can be used as fuel because plants can be burned so they compose the plants to make a liquid

Answer:

Thermal energy is not transferred between the cup and the cold water.

(D) is correct option.

Explanation:

Given that,

An empty paper cup is the same temperature as the air in the room. A student fills the cup with cold water.

We know that,

Thermal energy :

If we rise the temperature of the object then the molecules of the object moves faster and collide to each other, which energy produced by this process it is called thermal energy.

We can say that, The thermal energy is produced by temperature of hot object.

We need to find the how thermal energy is transferred

Using given data

Here temperature is same of cup and cold water.

So, thermal energy is not transferred between the cup and the cold water because here no more thermal energy.

Hence, Thermal energy is not transferred between the cup and the cold water.

(D) is correct option.

The main ions present in the electrolytic cell during the electrolysis of 4 mol/L nitric acid are H+, NO3-, OH-, and NO2. Additionally, water (H2O) is also present as the solvent.

Hydrogen ion (H+): When nitric acid dissolves in water, it ionizes to release hydrogen ions, which are positively charged. The chemical symbol for the hydrogen ion is H+.

Nitrate ion (NO3-): Nitric acid also dissociates to form nitrate ions. These ions have a negative charge, and their chemical symbol is NO3-.

Hydroxide ion (OH-): Water molecules can undergo self-ionization, producing hydroxide ions and hydrogen ions. In the presence of water, nitric acid can also lead to the formation of hydroxide ions, OH-.

Nitrogen dioxide (NO2): During the electrolysis process, some nitrate ions may be oxidized at the anode to form nitrogen dioxide gas. The chemical symbol for nitrogen dioxide is NO2.

Water (H2O): Water itself is present in the electrolytic cell. It serves as the solvent and also participates in ionization reactions.

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There are approximately 6.022 × 10^23 atoms in 12 grams of Carbon-12 (12C).

The number of atoms in a given amount of a substance can be calculated using Avogadro's number, which represents the number of atoms or molecules in one mole of a substance. Avogadro's number is approximately 6.022 × 10^23.

Carbon-12 is a specific isotope of carbon, with an atomic mass of 12 atomic mass units (amu). One mole of Carbon-12 has a mass of 12 grams. Since one mole of any substance contains Avogadro's number of particles, in the case of Carbon-12, it contains 6.022 × 10^23 atoms.

Therefore, if we have 12 grams of Carbon-12, which is equal to one mole, we can conclude that there are approximately 6.022 × 10^23 atoms in this amount of Carbon-12.

In summary, 12 grams of Carbon-12 contains approximately 6.022 × 10^23 atoms. Avogadro's number allows us to relate the mass of a substance to the number of atoms or molecules it contains, providing a fundamental concept in chemistry and enabling us to quantify and understand the microscopic world of atoms and molecules.

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The oxidation number of Ag in Ag2O is +1.

In Ag2O, there are two silver atoms (Ag) and one oxygen atom (O). Oxygen is known to have an oxidation number of -2 in most compounds. Since the compound is neutral, the sum of the oxidation numbers of all the atoms must equal zero.

Therefore, the oxidation numbers of the two silver atoms must add up to +2 to balance out the -2 oxidation number of the oxygen atom. Since there are two silver atoms, each silver atom must have an oxidation number of +1 to yield a total oxidation number of +2 for the compound.

In Ag2O, the silver atoms lose one electron each to form Ag+ ions. This results in an oxidation number of +1 for each silver atom. The oxygen atom gains two electrons from the silver atoms to achieve a stable octet configuration, resulting in an oxidation number of -2 for the oxygen atom. The compound Ag2O is formed through the transfer of electrons, with each silver atom exhibiting an oxidation number of +1.

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There are 0.84 moles of aluminum ions (Al3+) present in 0.42 mol of Al2(SO4)3.

To determine the number of moles of aluminum ions (Al3+) present in 0.42 mol of Al2(SO4)3, we need to consider the stoichiometry of the compound.

The formula of aluminum sulfate (Al2(SO4)3) indicates that for every 1 mole of the compound, there are 2 moles of aluminum ions (Al3+). This means that the mole ratio of Al3+ to Al2(SO4)3 is 2:1.

Given that we have 0.42 mol of Al2(SO4)3, we can calculate the moles of Al3+ as follows:

Moles of Al3+ = 0.42 mol Al2(SO4)3 x (2 mol Al3+ / 1 mol Al2(SO4)3)

Moles of Al3+ = 0.42 mol Al2(SO4)3 x 2

Moles of Al3+ = 0.84 mol Al3+

Therefore, there are 0.84 moles of aluminum ions (Al3+) present in 0.42 mol of Al2(SO4)3.

It's important to note that the stoichiometry of the compound determines the mole ratio between the different species involved in the chemical formula. In this case, the 2:1 ratio of Al3+ to Al2(SO4)3 allows us to determine the number of moles of Al3+ based on the given amount of Al2(SO4)3.

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Mumbai is the best as it has the largest population and the closest temp to that of cooking pasta

Mumbai an city in India with an average temperature of 33C and a population of about 21,296,516

Denver a city in Colorado in the USA with a temperature of 5C and a population of 705,576 (2019)

Mexico City  a city in Mexico with a temperature of 12C and a population of 9 Million persons

Therefore, Mumbai is the best as it has the largest population and the closest temperature to that of cooking pasta

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Answer:

B) Hope this helps! :)

Explanation:

Answer:

C) W is the amplitude, and an increase in W is associated with an increase in energy.

E) X is wavelength, and a decrease in X is associated with an increase in energy.

Explanation:

A transverse wave consists of an oscillating electric field that is perpendicular to the direction of the wave. Increasing either the amplitude or the wavelength of the wave increases its energy. For a transverse wave, the amplitude corresponds to W, while the wavelength is labeled X. So increasing W or decreasing X will create increase the energy of the wave.

Answer:  60 g

Explanation:  Mass is the product of density and volume.

Density (2 g/cm^3)

Volume (30 cm^3)

(2 g/cm^3)*(30 cm^3) = 60 g

Answer:

1 tablet

Explanation:

Assuming that gm stands for gram:

Put everything in one unit, 0.3 g = 300 mg.

And given that each tablet is 300 mg:

mass/amount = 300mg / 1 tablet

300mg / X amount = 300mg / 1 tablet

(300mg/300mg) tablet = X = 1 tablet

So it is 1 tablet you need.

One tablet should be given. A dosage is a set quantity of medication administered all at once.

A dosage is a set quantity of medication administered all at once. Contrarily, the dosage is the recommended way to take the drug: a specified quantity, amount, and regularity of doses spread over a specific amount of time.

To put it another way, a dosage is simply the quantity of medication that you consume at one particular moment. The dosage consists of the pharmacological dose, or amount, as well as the timing and frequency of administration. How you should administer or take the recommended medication is determined on the dosage.

0.3 g = 300 mg.

each tablet is 300 mg:

mass/amount = 300mg / 1 tablet

300mg / X amount = 300mg / 1 tablet

(300mg/300mg) tablet = X = 1 tablet

Therefore, one tablet should be given.

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In the ideal gas law, the temperature of the hydrogen gas determined if the volume and pressure of the gas is known.

The ideal gas law states that the pressure of ideal gas is directly proportional to the absolute temperature of the gas.

PV = nRT

where;

The temperature of the gas is determined as follows;

\(T = \frac{PV}{nR}\)

Thus, we can conclude that in the ideal gas law, the temperature of the hydrogen gas determined if the volume and pressure of the gas is known.

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Reaction 2 is 3.67 times faster compared to reaction 1

From the question given above, the following data were obtained:

To compare the rate of reaction 2 to reaction 1, do the following:

Comparison = Reaction 2 / Reaction 1

Reaction 2 / Reaction 1 = 0.44 / 0.12

Reaction 2 / Reaction 1 = 3.67

Cross multiply

Reaction 2 = 3.67 × Reaction 1

Thus, we can conclude that reaction 2 is 3.67 times faster than reaction 1

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The concentration of the acid is \(0.25 M\).

Titration is a laboratory technique used to determine the concentration of a substance in a solution by reacting it with a standardized solution of known concentration.

The titration formula can be given by,

(Volume of the Base) \(\times\) (Normality of the Base) = (Volume of the Acid) \(\times\) (Normality of the Acid)

\(\Rightarrow V_1N_1=V_2N_2\)

Given, the volume of the base (\(NaOH\)), \(V_1 =25 ml\).

The concentration of the base (\(NaOH\)), \(M_1=0.5 M\).

The equivalence of the base (\(NaOH\)) is \(1\).

Hence, the normality of the base (\(NaOH\)), \(N_1=\frac{0.5}{1}N=0.5N\).

Given, the volume of the acid (\(HCl\)), \(V_2 =50 ml\).

Let us assume that the normality of the acid (\(HCl\)) \(N_2\).

Substitute the values in the given formula of titration.

\((25\times0.5)=(50 \times N_2)\\\Rightarrow 12.5=50N_2\\\Rightarrow N_2=\frac{12.5}{50} N\\\Rightarrow N_2=0.25 N\)

Hence, the normality of the acid (\(HCl\)), \(N_2=0.25 N\).

The equivalence of the acid (\(HCl\)) is \(1\).

Therefore, the concentration of the acid, \(M_1=\frac{0.25}{1}=0.25 M\).

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