Why do halogens get less reactive?

The test result, which shows a bond with beryllium but not lithium, does not support her conclusion.

What is beryllium?

Beryllium basically is a chemical element with the symbol Be and atomic number 4. It is a light, strong, and alkaline metal that is used in alloys, medical equipment, and aerospace components due to its light weight and high strength. It is also used in nuclear reactors as a neutron reflector and absorber.

Beryllium is a group 2 element that forms ionic bonds with nonmetals.

Non-metals are elements ranging from Group 15 to Group 17.

As a result, the unknown element must be from Group 15 to Group 17.

Hence, her conclusion that the unknown element belong to group 2 is wrong.

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The three elements that are highly reactive belongs to alkali metals i.e., s-block elements that are lithium, sodium and potassium.

The elements that belongs to s block elements are hydrogen (H), lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr). The nature of alkali metals is soft and shiny in appearance. They have low melting point and are highly reactive in nature and usually tarnish when exposed to air. Sodium (Na) is the most reactive element since it's valence electrons are not tightly held together in the atom. The three elements that are highly reactive are Lithium (Li), Sodium (Na), and potassium (K). The elements toward the bottom left corner of the periodic table are the metals that are the most active in the sense of being the most reactive

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The percent yield of water vapor is 1000%, which is not possible and this is an indication that the experiment has not been done accurately or there is an error in the data, or the reaction is not a complete reaction.

To calculate the percent yield of a reaction, you need to know the theoretical yield (the maximum amount of product that could be produced based on the balanced equation) and the actual yield (the amount of product that was actually produced in the lab). To find the theoretical yield, you can use the balanced equation for the reaction and the amount of reactant that was used.

The balanced equation for the decomposition of iron(III) hydroxide is:
Fe(OH)3 --> Fe2O3 + H2O

We are given that 8.0 g of Fe(OH)3 was used in the reaction.
From the balanced equation, we can see that for every 1 mole of Fe(OH)3 that reacts, 1 mole of H2O is produced.

The molar mass of Fe(OH)3 is 106 g/mol
so the amount of moles of Fe(OH)3 is 8.0 g / 106 g/mol = 0.075 moles

The theoretical yield of H2O would then be 0.075 moles.

We also know that 0.75 L of H2O is isolated at STP, which is equivalent to 0.75 moles of H2O.

The percent yield can be calculated by dividing the actual yield by the theoretical yield, and multiplying by 100%.

% yield = (actual yield / theoretical yield) * 100%

% yield = (0.75 moles / 0.075 moles) * 100%
% yield = 10 * 100%
% yield = 1000%

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Use the grams to moles formula to calculate the number of moles, n, of a substance with a given mass, m, (in grams) accurately, where M denotes the substance's molar mass. Typically, g/mol is used as the unit.

n = m / M

The mole is the SI unit used to measure a substance's quantity. There are precisely 6.02214085774× 10²³ atoms, molecules, or other particles in one mole of matter. The Avogadro number is this enormous magnitude. A mole of a substance is defined as a mass of material that contains exactly 12,000 g of 12C's exact number of atoms as fundamental units. The International System of Units uses the mole (symbol: mol) as the unit of material quantity (SI). 

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Explanation:

decentralized multinational corporations, centralised global corporations, international companies, and transnational enterprises.

The energy that is released for the breaking of bonds is 229 kJ/mol.

We should be able to recall that the enthalpy of the reaction taken to be the energy that is evolved or absorbed in the reaction that is ongoing. We have to note that in the course of the reaction there would be the breaking and the making of bonds.

Now we know that;

The bond energy can be given as;

Sum energy of the broken bonds of reactants  - Sum of the energy of the formed bonds

Hence;

(945 + 498) - 2(607)

1443 - 1214

= 229 kJ/mol

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By the process of evaporation

A 7.5 10-3 M Ba(OH)2 solutions at 25°C has a pH of 1.82. (option b).

A homogenous solution of two or more ingredients with particles smaller than one nm is referred to as a solution. Solutions come in many forms, such as soda water, salt and sugar solutions, etc. In a solution, every element appears as a single phase.

In chemistry, a solution is a homogeneous mix of two or more molecules in relative proportions that can be constantly changed up to what is known as the limit of solubility. Although the term "solution" is frequently used to refer to the liquid state of matter, solutions of gases and solids are also possible.

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The molarity of 2. 50 m NaCl solution is 2.68 molal and 48. 2 percent by mass KBr solution is 7.82 m.

Molality = moles solute / kg solvent  

Assume we have 1000 ml of solution.

1000 ml ₓ 1.08 g/ml = 1080 g

Now find the mass of NaCl:

2.50 M NaCl = 2.50 mol/L and 2.50 mol/L x 1 L = 2.50 moles of NaCl

molar mass NaCl = 58.4 g/mol, therefore mass NaCl present = 2.50 mol ₓ 58.5 g/mol = 146 g NaCl

Now find the mass of H₂O:

grams H₂O present = 1080 g - 146 g = 934 g H2O = 0.0.934 kg

We now have moles NaCl and kg H₂O

Molality  = 2.50 mol / 0.934kg = 2.68 molal

48.2% by mass of KBr means 48.2 g KBr / 100 g solution

To find molality, we need moles of KBr and kg of H₂O.  We can easily find he moles of KBr from the mass and the molar mass.

If we have 100 g solution, 48.2 g is KBr so the rest is H₂O.

100 g - 48.2 g = 51.8 g H₂O and this is equal to 0.0518 kg H₂O

Moles KBr = 48.2 g KBr ₓ 1 mol KBr/119 g = 0.405 moles KBr

Molality = 0.405 moles KBr / 0.0518 kg H₂O = 7.82 m

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The empirical formula for the given compound is C6H6.

The molecular formula represents the precise digits of the atoms found in the given molecule of the compound, whereas the empirical formula represents the proportional of the atoms found in the provided compound.

The empirical formula defines the individual atoms that make up a species in the simplest whole number ratio possible. The

The empirical formula is always multiplied by the molecular formula.

Given the foregoing, the empirical formula for the molecular formula is n.

Because of this, the molecular formula is: 78.0 g m o l 1 = n ( 12.011 + 1.00794 ) g m o l 1

n \s= \s78 \s12.011 \s+ \s1.00794 =6 \s .

And the chemical formula is C 6 H 6.

Molecular formula, although not always.≡

empirical formula, which includes the multiple n=1 \s .

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The number of moles of MgCO3 that is present in the given mass of magnesium carbonate is 2.99 moles.

The number of moles can be defined as the ratio of given mass over molar mass. The chemical that is given is magnesium carbonate having molar mass of 84.314 g/mol and the given mass of the same is 252.939 grams.

The formula for number of moles that is 'n' can be given as follows:

n= m/M where m is the given mass and M is the molar mass.

Substituting the values,

n= 252.939 grams /84.314 grams/mol

n=2.99 moles

Therefore, the number of moles of MgCO3 is 2.99 moles.

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H₂ (g) + O₂ (g) ⇒ H₂O (g) because Hydrogen and oxygen gas both exist as diatomic molecules. The water is in gaseous state due to the heat given off by the combustion reaction.

Combustion, often known as burning, is a high-temperature exothermic redox chemical reaction that occurs between a fuel and an oxidant, typically atmospheric oxygen, to generate oxidized, generally gaseous products in a mixture known as smoke. A combustion reaction is a type of chemical reaction that occurs when any combustible component reacts with an oxidiser to generate an oxidised product. Fires and the release of energy in the form of heat are frequently associated with combustion processes. A hydrocarbon generally combines with oxygen in most combustion processes to produce carbon dioxide and water.

Here,

Because hydrogen and oxygen gas exist as diatomic molecules, H2 (g) + O2 (g) = H2O (g). Because of the heat produced by the combustion reaction, the water is in a gaseous condition.

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The coefficient of ammonia in the above chemical equation is 3.

A chemical equation is said to be balanced when the number of the atoms involved in the reactants side is equal to the number of atoms in the products side.

Balancing chemical equations involves the addition of stoichiometric coefficients to the reactants and products.

According to this question, ammonia reacts with oxygen gas to produce nitrogen oxide and water as follows:

4NH₃ + 50₂ → 4NO + 6H₂O

Based on the above balanced equation, it can be said that the coefficient of ammonia is 4.

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When 200 grams of water cools from 50.0°C to 250°C, the total amount of heat energy released by the water is The total amount of energy released is 20, 930 J.

We will apply the formula. q = mCt, where q is the amount of heat energy released. m= mass. C is the specific heat of the water. T= temperature change. Because the specific heat of the water has not been specified, we will use the standard value of 4.186J/g °C. q = mCΔT. q = 200 × 4.186 × (50 -25) (50 -25) q = 200 × 4.186 × 25 q = 5000 × 4.186 q = 20, 930 The total amount of energy released is 20, 930 J.

In physics, energy (from Ancient Greek: v, enérgeia, "activity") is a quantitative property that is transferred to a body or a physical system and is visible in the performance of work as well as in the form of heat and light. Energy is a conserved quantity, which means that it can be converted in form but not created or destroyed. The joule is the SI unit of energy measurement (J).

The kinetic energy of a moving object, the potential energy stored by an object (for example, due to its position in a field), the elastic energy stored in a solid object, and the chemical energy associated with chemical reactions are all common types of energy.

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The total number of moles contained in 115 grams of C₂H5OH is 2.50 moles .

The term "mole" refers to the quantity of a substance that has the same amount of subatomic particles (ions, molecules, or atoms) as there are carbon atoms.

Atomic weight of carbon(C)= 12 gm

Atomic weight of Hydrogen (H)=1 gm

Atomic weight of oxygen (o)=16 gm

∴Molecula weight of C2H5OH =(12×2 + 1×6 + 16×1) gm

24 + 6 + 16 gm = 46 gm

∴ 46 gm of C2H5OH contains 1 mole

1 gm of C2H5OH contain = 1/46 moles

115 gm of C2H5OH contains = 115×1/46 moles

⇒2.5 moles

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Explanation:

use to describe something that is complete opposite

After solving the equation: The new volume of the balloon will be 600 cm3.

Volume is a measure of the three-dimensional space occupied by a substance or object. In chemistry, volume is most commonly measured in liters (L). It is used to measure the amount of a substance that is present. For instance, when performing a reaction, the volume of the reactants is measured to determine the molar amounts of the reactants.

This is because the volume of a balloon is directly proportional to its temperature. So when a balloon is heated, the volume increases. In this case, the balloon's temperature was increased by 30 cm, so the volume was increased by 300 cm3 (30 cm x 10 cm3, since the volume of a balloon is proportional to its temperature to the power of 3). Thus, the new volume is 600 cm3 (300 cm3 + 300 cm3).

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After solving the equation: The half-life for this reaction is 0.693/0.271 = 2.56 s.

Reaction is the response of a system to an external or internal stimulus. It is the way a person or object behaves in response to a change in their environment. Reactions can be physical, chemical, or psychological. Physical reactions involve changes in the body, such as muscle tension, sweating, or heart rate.

The half-life for this reaction is the time it takes for the concentration of molecular iodine to decrease by a factor of 2, or for half of the original amount of molecular iodine to react. This can be calculated using the equation:

T1/2 = 0.693/k

where k is the first-order rate constant.

Therefore, the half-life for this reaction is 0.693/0.271 = 2.56 s.

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Answer:

because I'm the reactivity table of metals it shows that iron is indeed more reactive than copper

Explanation:

potassium (most reactive)

sodium

lithium

calcium

magnesium

aluminum

zinc

iron

tin

lead

hydrogen

copper

mercury

silver

gold( least reactive)

22.3 g of NaN₃ are required to fully inflate an airbag of 11.5 L at STP.

Chemical decomposition, also known as chemical breakdown, is the process of breaking down a single chemical entity into two or more components. Chemical breakdown is commonly thought of and characterized as the inverse of chemical synthesis. When one reactant breaks down into two or more products, this is referred to as a decomposition reaction. This is expressed by the following generic equation: AB A + B. The breakdown of hydrogen peroxide to water and oxygen is an example of a decomposition process, as is the breakdown of water to hydrogen and oxygen.

Here,

In airbags, sodium azide decomposes to form sodium and nitrogen gas, which inflates the bag. The decomposition reaction is:

2 NaN₃ ⇒ 2 Na + 3 N₂

We can calculate the mass of NaN₃ needed to produce 11.5 L of N₂ at STP, using the following relations.

At STP, 1 mole of N₂ occupies 22.4 L.

The molar ratio of N₂ to NaN₃ is 3:2.

The molar mass of NaN₃ is 65.01 g/mol.

=11.8*1/22.4*2/3*65.01/1

=118/112*21.67

=22.82 g

22.3 g of NaN₃ are required to fully inflate an airbag of 11.5 L at STP.

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The following elements can be isolated by electrolysis of the aqueous salt :  Phosphorus from K3PO4 (aq).

Electrolysis is the method used to divide water into hydrogen and oxygen. An electrolyzer is a device where this process takes place.

In chemistry and production, the electrolysis method can be used to speed up a typically non-spontaneous chemical reaction. Electrolysis is significant from a business perspective as a phase in the electrolytic cell-based separation of elements from naturally existent sources like ores.

By introducing an electric current into a substance, electrolysis alters its chemical makeup. Depending on the substance, one electron is either lost or acquired during the chemical reaction (oxidation or reduction).

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According to Gay-Lussac's law, the pressure of the gas at the cooler temperature is 132.95 torr.

It is defined as a gas law which states that the pressure which is exerted by the gas directly varies with its temperature and at a constant volume.The law was proposed by Joseph Gay-Lussac in the year 1808.

The pressure of the gas at constant volume reduces constantly as it is cooled till it undergoes condensation .

It is given as, P₁/T₁=P₂/T₂ , therefore P₂=225×65/110=132.95 torr.

Therefore,the pressure of the gas at the cooler temperature is 132.95 torr.

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If the density of blood is 1.060 g/mL, then the mass of 6.56 pints of blood is 3.29 grams.

The density of a substance is the measure of how densely it is packed together. It is expressed as mass per unit volume. Symbol for density: D or Formula for Density: = m/V, where is the density, m is the object's mass, and V is the object's volume. Density is the amount of things (people, animals, plants, or items) in a given area. To compute density, divide the number of items by the area measured. A country's population density is the number of inhabitants divided by its area in square kilometers or miles.

Here,

6.56 pints  * 473.1765 ml/pint  * 1.060 g/ml = 3.290  gm

The mass of 6.56 pints of blood is 3.29 grams if the density of blood is 1.060 g/mL.

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The quantity of matter in a body,object,or substance is B. Mass.

A body's mass is an inherent quality. Prior to the discovery of the atom and particle physics, it was widely believed to be related to the amount of matter in a physical body.

It is the most fundamental characteristic of matter and one of the fundamental quantities in physics. Mass is a term used to describe how much matter is present in a body. The kilogram is the SI unit of mass (kg). A body's mass does not alter at any point in time.

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On the basis of arrangement of atoms, the matter is classified into three states: solid, liquid and gas.

In Chemistry, there are three fundamental states of matter based on the arrangement of molecules and atoms inside it.

Generally, solids have strict and rigid arrangement of atoms as they posses strong intermolecular forces and have high melting and boiling points. solids have fixed composition of atoms.

Similarly, liquids have loose arrangement of atoms and molecules keep moving randomly in a liquid. Liquids have low melting and boiling points as compared to solids. Gases have weakest intermolecular forces and atoms are arranged randomly in them. Also, their molecules keep moving in all directions.

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Electron micrographs aided Davson-Danielli in determining the membrane structure since they assumed the phospholipids were in between the proteins, resulting in the sandwich model.

An picture acquired by hitting the object with a tightly focused (10 nm diameter) electron beam and measuring the transmitted, secondary, backscattered, and diffracted electrons, as well as the distinctive X-rays released. The method of electron microscopy (EM) is used to acquire high-resolution pictures of biological and non-biological material. In biomedical research, it is utilized to explore the precise structure of tissues, cells, organelles, and macromolecular complexes. Modern electron microscopes generate electron micrographs by capturing pictures with sophisticated digital cameras and frame grabbers.

Here,

Davson-Danielli was assisted in establishing the membrane structure by electron micrographs since they thought the phospholipids were in between the proteins, resulting in the sandwich model.

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a) The balanced equation is :

C₂H₆   +  Cl₂ --->  C₂H₅Cl  + HCl

b) The percent yield is the 83.0 % %.

a) The balanced equation  is given below :

C₂H₆   +  Cl₂ --->  C₂H₅Cl  + HCl

b) mass of the ethane = 300 g

molar mass of the ethane = 30 g/mol

moles of the ethane = 300 / 30

                                  = 10 mol

mass of chlorine = 650 g

molar mass of the chlorine = 71 g /mol

moles = 650 / 71

          = 9.15 mol

it is clear the the chlorine is the limiting reactant.

1 mole of the chlorine produces the 1 mole of the C₂H₅Cl

moles of the C₂H₅Cl = 9.15 mol

mass of the C₂H₅Cl = 9.15 × 64.5

                                  = 590.175 g

The percent yield = (experimental yield / theoretical yield )  × 100 %

                              = ( 490 / 590 .175 ) × 100 %

                              = 83.0 %

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Answer:

Explanation:

They are Covalent networks solids

A carbonyl group is bound to hydrogen bond or to a hydrogen ion and an alkoxy substituent in an organic compound known as an aldehyde.

Aldehyde is an organic compound containing a functional group with the structure −CHO, in which a carbon atom is double-bonded to an oxygen atom and single-bonded to a hydrogen atom. Aldehydes are the simplest type of carbonyl group and the most common type of organic compound. Aldehydes are found in many natural and manufactured products, including perfumes and food products. The most common example of a natural aldehyde is formaldehyde, which is produced by plants and animals.

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