A student is trying to identify an unknown metal X. When he puts it in copper sulphate there is a reaction and red brown pieces of copper fall to the bottom of the test tube. But when he puts metal X into magnesium chloride nothing happens
A) Give two identity of metal X.
B) Out of these two which one is metal X ?

Primary alcohols react using the SN2 mechanism, whereas secondary and tertiary alcohols react using the elementary SN1 process, where no carbocation is produced.

The carbon atoms attached to OH can be used to identify the kind of alcohol.According on how many other carbons are linked to that carbon, the alcohol is categorized as primary, secondary, or tertiary.

Tertiary alcohols' alkyl groups provide electron density to the alcohol's oxygen, which reduces the alcohol's acidity.When a result, the acidity of alcohol reduces as more alkyl groups are connected to an alcohol functional group on carbon.

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Answer:126

Explanation:

The cutoff ratio of 2 indicates that the combustion occurs when the piston is at 2/3 of its stroke, meaning that only 1/3 of the heat added during combustion is converted into work.

The diesel cycle is a thermodynamic cycle that describes the operation of a diesel engine. To analyze the diesel cycle with the given parameters, let's go through the different processes:Intake process: The air is taken into the cylinder at 95 kPa and 23°C.Compression process: The air is compressed adiabatically with a compression ratio of 18.25. Since the compression is adiabatic, there is no heat exchange with the surroundings. The temperature and pressure increase during this process.Combustion process: Fuel is injected into the compressed air, leading to combustion. The combustion occurs at a constant pressure. The heat released from the combustion increases the temperature and pressure of the working fluid.Expansion process: The hot gases expand adiabatically, pushing the piston down and doing work. The pressure and temperature decrease during this process.Exhaust process: The exhaust gases are expelled from the cylinder, completing one cycle.

To determine the specific values of temperature, pressure, and other parameters during the different processes of the diesel cycle, additional information or equations specific to the engine design and operating conditions are required.

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The given statement "The determinant of health that includes pollutants, hazardous exposure at work, and water contamination is called the physical environment." is false.

The determinant of health that includes pollutants, hazardous exposure at work, and water contamination is called "physical environment" or "built environment" determinant of health. "Macroenvironmental conditions" is not a commonly used term in the context of determinants of health.

The various factors that can affect a person's health and well-being are referred to as health determinants. These factors fall into four broad categories: social and economic factors, health behaviours, individual characteristics, and physical or built environment.

The physical or built environment determinant of health includes all physical conditions and environmental factors that can have an impact on a person's health, such as air quality, water quality, housing conditions, transportation infrastructure, and access to green spaces. This health determinant is further subdivided into subcategories such as pollution exposure, hazardous work conditions, and water contamination, among others.

The term "macroenvironmental conditions" is not a commonly used term in the context of determinants of health. However, it is possible that it may be used in other contexts to refer to broader environmental conditions, such as climate or natural disasters.

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Answer:

There are significant environmental impacts associated with coal mining and use. It could require the removal of massive amounts of top soil, leading to erosion, loss of habitat and pollution. Coal mining causes acid mine drainage, which causes heavy metals to dissolve and seep into ground and surface water.

Explanation:

I hope it will help you...

Answer:

If Thomson's atomic theory was accurate, the positively charged particles would have gone through the foil.

Answer:

Physical changes.

Explanation:

Any physical changes can be related to boiling. Freezing water, tearing paper, anything physical that changes and objects apperance is a physical change.

Answer:

The law of conservation of energy states that energy can neither be created nor destroyed - only converted from one form of energy to another. This means that a system always has the same amount of energy, unless it's added from the outside.

Explanation:

Answer:

The law of conservation of energy states that energy can neither be created nor destroyed - only converted from one form of energy to another. This means that a system always has the same amount of energy, unless it's added from the outside.

Explanation:

ifunny is dankreloaded

The most common examples of molecules containing polar covalent bonds are HBr, HCl, and H2O. Therefore, the correct answer is B) HBr.

A polar covalent bond is formed when one atom has a greater electronegativity than the other. The molecule HBr contains a polar covalent bond because hydrogen has a greater electronegativity than bromine. Therefore, the answer is B. HBr.

The correct answer is B. HBr, as it contains a polar covalent bond due to the difference in electronegativity between the hydrogen and bromine atoms.

Polar covalent bonds occur when the electrons in the bond are not shared equally between the two atoms.

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Answer:

6.76*10^-4 , or 6.8*10^-4 if you consider sig figs

Explanation:

This is a bit of a confusing question, since it incorrectly states that the acid disassociation constant is simply [H+][F-].
Ka = [H+][F-]/[HF] , so plugging in the values, we get
\(K=\frac{[2.6*10^{-3}][2.6*10^{-3}]}{[0.01]}\\K=\frac{[2.6*10^{-3}]^2}{[0.01]}\\K=0.000676=6.76*10^{-4}\)

If we were to use the equation in the question, Ka=[H+][F-], we would get the answer 6.76 * 10^-6 , which is not the Ka for HF

The appropriate response is: MgCO₃ (s) → MgO (s) + CO₂ (g)

According to this equation, 1 mole of magnesium carbonate reacts to produce 1 mole of magnesium oxide and 1 mole of carbon dioxide, and 117.3 kJ is absorbed.

What Are the Health Benefits of Magnesium Carbonate?

Magnesium carbonate is a naturally occurring white, powdered substance that is commonly advertised as a health supplement. It can be found in dolomite and magnesite. Magnesium, a mineral that your body needs to function properly, is the main component of this product. According to MedlinePlus, the average human body weighs 25 g of magnesium, half of which is found in bone. Beyond its function in the prevention and treatment of magnesium shortage, magnesium carbonate possesses a wide range of therapeutic qualities. Always get medical advice before using magnesium carbonate to treat, prevent, or cure any ailment.

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The statement that correctly describes the reaction of sulfur dioxide gas in the presence of oxygen and vanadium(V) oxide to form sulfur trioxide is: Vanadium (V) oxide is a catalyst.

The correct option is 4.

A catalyst is a substance that alters the rate of a chemical reaction but which remains chemically unchanged at the end of the chemical reaction.

A catalyst can increase the rate of chemical reactions and it can also decrease the rate of chemical reactions. Catalysts that increase the rate of chemical reactions are called positive catalysts whole catalysts that decrease the rate of chemical reactions are called negative catalysts.

Catalysts alter the rate of chemical reactions by lowering or raising the activation energy of a reaction.

The reaction of sulfur dioxide gas in the presence of oxygen and vanadium(V) oxide to form sulfur trioxide is a catalytic reaction.

In the reaction, vanadium(V) oxide acts as a positive catalyst by speeding up the rate of the reaction.

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Complete question:

Sulfur dioxide gas can react in the presence of oxygen and vanadium(V) oxide to form sulfur trioxide. Sulfur trioxide is the only product of the reaction. Which statement correctly describes this reaction?

1) Sulfur dioxide is a catalyst

2) Sulfur trioxide is a catalyst

3) Oxygen is a catalyst

4) Vanadium (V) oxide is a catalyst

Answer:

Noble gases are called "safe" gases because they are inert.

General Formulas and Concepts:

Explanation:

Because Noble Gases have filled their outer shell electrons fully, they tend not to form compounds with other elements or react with others to produce another compound.

Take Ne (neon) for instance. It's electron configuration is 1s²2s²2p⁶. The outer most shell is the 2p sublevel, and according quantum numbers, the 2p sublevel only has 3 spaces for 2 electrons each that it can hold. Therefore, Ne has a full outer shell and no electron spots to create a bond with other elements.

The balanced chemical equation is 2 K +  Cl₂\(\rightarrow\) 2 KCl and as per stoichiometry 4.4 g potassium gives 8.41 g potassium chloride.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

As per stoichiometry, 78 g potassium gives 149.1 g potassium chloride thus 4.4 g potassium will give 4.4×149.1/78=8.41 g.

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In redox reactions, electrons are transferred from one species to another. If the response is spontaneous, strength is released, that could then be used to do beneficial work.

To harness this strength, the response have to be break up into separate 1/2 of reactions: the oxidation and reduction reactions. The reactions are placed into one of a kind bins and a twine is used to pressure the electrons from one aspect to the other. In doing so, a Voltaic/ Galvanic Cell is created. An electrode is strip of metallic on which the response takes region. In a voltaic cell, the oxidation and discount of metals takes place on the electrodes. There are electrodes in a voltaic cell, one in every 1/2 of-cell. The cathode is wherein discount takes region and oxidation takes region on the anode. Through electrochemistry, those reactions are reacting upon metallic surfaces, or electrodes. An oxidation-discount equilibrium is mounted among the metallic and the materials in solution. When electrodes are immersed in an answer containing ions of the equal metallic, it's far referred to as a 1/2 of-cell.

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The balanced chemical equation between pottasium and chlorine is as follows: 2K + Cl₂ → 2KCl. It is a combination reaction.

A chemical reaction is a process, typically involving the breaking or making of interatomic bonds, in which one or more substances are changed into others.

According to this question, a chemical reaction occurs between potassium metal and chlorine gas to form pottasium chloride as follows:

2K + Cl₂ → 2KCl

The chemical reaction is a combination reaction because it involves the combination of two elements to form a compound.

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Answer:

They are producers

Explanation:

Phytoplankton are producers and this is because they synthesis their own food and produce energy. They photosynthesized and convert carbondioxide and water in the presence of light energy and chlorophyll to carbohydrates and oxygen. They are producers because they produce their own food.

Answer: d) is correct

Explanation:

a) burning trees creates more carbon emissions

b) dead trees cannot turn co2 into oxygen and destroying them releases co2 in wood and soil

c) transpiration from plants creates 10% of the atmosphere's moisture, the rest being oceans, rivers and lakes

Answer:

166.04g

Explanation:

Mass=Moles xRMM

1 mole = 6.023 x10^23molecules

5.0 x10^25molecules

=83.02moles

RMM=2

mass=83.02 x2

and=166.04g

Answer:

Explanation:

it's B. 2 HCI: 1 CaCO3 :)

The molecular geometry of a given element is octahedral and it has no dipole moment. Therefore octahedral, No would be the correct answer.

The SF6 molecule has no dipole moment because each S−F bond dipole is balanced by one of equal magnitude pointing in the opposite direction of the other side of the molecule.

The three-dimensional configuration of the atoms that make up a molecule is known as molecular geometry. In addition to providing details about the molecule's overall shape, it also provides data on the bond lengths, bond angles, torsional angles, and any other geometrical factors that affect each atom's position.

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The first step to answer this question is to assume that the given percents are masses.

Then, convert these masses to moles using the corresponding molar mass:

Divide each result by the least result (1.26mol):

Since not all of these are whole numbers, we have to multiply them times 2:

These numbers are the subscripts of each element in the empirical formula.

It means that the empirical formula of this compound is:

Answer:

A- evaporates

Answer:

Condenses

Explanation:

Clouds are created when water vapor, an invisible gas, turns into liquid water droplets. These water droplets form on tiny particles, like dust, that are floating in the air.

The reactants in candle burning would be carbon, hydrogen, and oxygen.

Fuel (the candlewick and wax) and oxygen are the reactants in the burning of a candle (in the air). Carbon dioxide gas and water vapour are the end results. The substances were hydrogen, oxygen, and carbon. Since nothing is formed or destroyed during a chemical reaction, we can conclude that the element present in the products was also present in the reactants. The law of conservation of energy in physics and chemistry asserts that an isolated system's total energy remains constant. It is the underlying principle of the first law of thermodynamics, which is most frequently stated as "energy cannot be generated or destroyed."

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If you started with 1.5 moles of H2 at STP, you would have approximately 33.6 liters of volume of hydrogen (H₂) gas.

To determine the number of liters of H2 you have, we need to consider the conditions under which the gas is being held (i.e. temperature and pressure), as well as the molar volume of H2 at those conditions.

At standard temperature and pressure (STP), which is 0°C (273.15 K) and 1 atm (101.325 kPa), the molar volume of any ideal gas is approximately 22.4 L/mol.

Therefore, at STP, 1.5 moles of H₂ would occupy approximately:

V = n x Vm = 1.5 mol x 22.4 L/mol = 33.6 L

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The complete question is below:

HOW MANY LITERS OF H2 DO YOU HAVE IF YOU START WITH 1.5 MOLES OF H2? (assume STP condition)

Percent composition indicates the relative amounts of each element in a compound. For each element, the mass percent formula is: % mass = (mass of element in 1 mole of the compound) / (molar mass of the compound) x 100% or. mass percent = (mass of solute / mass of solution) x 100%.

Type of substance is the original orange solid is element .

What is chemical reaction ?

Chemical reaction, the process by which one or more substances (reactants) are transformed into one or more other substances (products). Substances are either chemical elements or compounds. Chemical reactions rearrange the constituent atoms of reactants to produce different substances as products.

Chemical reactions are an integral part of technology, culture, and even life itself. Fuel combustion, iron smelting, glass and pottery making, beer brewing, and wine and cheese making are just a few examples. Activities involving chemical reactions that have been around for thousands of years. Chemical reactions are abundant in a variety of complex processes that occur in Earth's geology, atmosphere and oceans, and in all biological systems.

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In an oxidation-reduction reaction, the species that is reduced gains electrons and therefore has a decrease in oxidation state.

An oxidising agent, often known as an oxidant, acquires electrons and transforms into a reduced state during a chemical reaction. Since it will absorb electrons and be reduced, the oxidising agent, also known as the electron acceptor, is normally in one of its higher oxidation states. Oxidising agents (H2O2) include oxygen and hydrogen peroxide as well as halogens (such as chlorine and fluorine).

Any species that undergoes oxidation to a higher valency state and loses electrons to other substances during a redox reaction is referred to as a reducing agent. Hydrogen acts as a reducing agent, lowering fluorine, by giving fluorine its electrons. Examples of reducing agents include earth metals, formic acid, and sulfite compounds.

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Answer:

Reacts with salt to from an acid

It will take approximately 35.4 years for both Cs-137 and Co-60 isotopes to decay until their activities are equal.

To determine the time it takes for both Cs-137 and Co-60 isotopes to decay until their activities are equal, we can use the decay function for each isotope and set them equal to each other.

The decay function for a radioactive isotope is given by:

A(t) = A₀ * exp(-λt)

Where:

A(t) is the activity at time t,

A₀ is the initial activity,

λ is the decay constant,

t is the time.

The decay constant (λ) can be calculated using the half-life (T₁/₂) of the isotope:

λ = ln(2) / T₁/₂

For Cs-137, the half-life is approximately 30.17 years, and for Co-60, the half-life is approximately 5.27 years.

Let's denote the time it takes for both activities to be equal as t_eq.

For Cs-137:

A(Cs-137) = 100 * exp(-0.693 / 30.17 * t_eq)

For Co-60:

A(Co-60) = 300 * exp(-0.693 / 5.27 * t_eq)

Setting the two equations equal to each other and solving for t_eq:

100 * exp(-0.693 / 30.17 * t_eq) = 300 * exp(-0.693 / 5.27 * t_eq)

Simplifying the equation:

1/3.0 * exp(-0.693 / 30.17 * t_eq) = exp(-0.693 / 5.27 * t_eq)

Taking the natural logarithm (ln) of both sides:

-0.693 / 30.17 * t_eq = -0.693 / 5.27 * t_eq

Solving for t_eq:

t_eq ≈ 35.4 years

It will take approximately 35.4 years for both Cs-137 and Co-60 isotopes to decay until their activities are equal. This calculation assumes that there is no other source of radiation or decay affecting the activities of the isotopes.

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