If 57500 joules of heat are given off when a sample of steam condenses, what is the mass of the steam?

Answer:

Explanation:

Decomposition reaction, also known as analysis or dissociation, is a type of chemical reaction in which a compound breaks down into simpler substances or elements. In this reaction, a single reactant undergoes a chemical change and produces two or more products.

The decomposition reaction can be represented by the general equation:

AB → A + B

Where AB is the reactant, and A and B are the products. The reactant AB is usually a compound, and it breaks down into its constituent elements or simpler compounds.

There are different types of decomposition reactions, including:

Thermal decomposition: It occurs when a compound is heated, resulting in its decomposition into simpler substances. For example, the thermal decomposition of calcium carbonate (CaCO3) produces calcium oxide (CaO) and carbon dioxide (CO2):

CaCO3 → CaO + CO2

Electrolytic decomposition: It takes place when an electric current is passed through an electrolyte, causing it to break down into its component ions. For instance, the electrolysis of water (H2O) leads to the decomposition into hydrogen gas (H2) and oxygen gas (O2):

2H2O → 2H2 + O2

Photochemical decomposition: It occurs when a compound undergoes decomposition due to exposure to light energy. Chlorine gas (Cl2) can decompose into chlorine atoms (Cl) under the influence of light:

Cl2 → 2Cl

These are just a few examples of decomposition reactions. They are important in various chemical processes and are used in industries, laboratory experiments, and natural phenomena. By understanding and controlling decomposition reactions, scientists can gain insights into the behavior of different compounds and develop practical applications in fields such as chemistry, materials science, and environmental science.

Answer:

Explanation:

reaction in which a compound breaks down into simpler substances or elements

Okay, let's solve this step-by-step without using quadratics:

1) The equilibrium constant Kc = 0.36 means the equilibrium lies to the left. So there will be more N2O4 than NO2 at equilibrium.

2) The initial concentration of N2O4 is 0.1 mol dm^-3. Let's call this [N2O4]initial.

3) At equilibrium, the concentrations of N2O4 and NO2 will be [N2O4]equil and [NO2]equil respectively.

4) We know the equilibrium constant expression for this reaction is:

Kc = ([NO2]equil)^2 / [N2O4]equil

5) Setting this equal to 0.36 and plugging in 0.1 for [N2O4]initial, we get:

0.36 = ([NO2]equil)^2 / (0.1 - [NO2]equil)

6) Simplifying, we get:

0.036 = [NO2]equil^2

7) Taking the square root of both sides, we get:

[NO2]equil = 0.06 mol dm^-3

So the equilibrium concentration of NO2 is 0.06 mol dm^-3.

Let me know if you have any other questions! I can also provide a more step-by-step explanation if needed.

The volume of O₂ : 21 L

Given

8.7 grams of C₂H₄

Required

Volume O₂

Solution

Reaction

C₂H₄ + 3 O₂ ⇒ 2 CO₂ + 2 H₂O

mol C₂H₄(MW= 28 g/mol) :

= mass : MW

= 8.7 g : 28 g/mol

= 0.311

From the equation, mol  O₂ :

= 3/1 x mol C₂H₄

= 3/1 x 0.311

= 0.933

At STP, 1 mol gas=22.4 L, so for 0.933 mol :

= 0.933 x 22.4 L

= 20.899 L ≈ 21 L

Answer:

Cl2 acts as an oxidizing agent

Explanation:

The balanced equation is

Cl2+NaOH⟶NaCl+NaClO3+H2O

Cl2 acts as a reactant in this chemical reaction

Cl2 receives one electron and thus reduces itself from Cl2 to 2 Cl−. This indicates that 2Cl- will oxidize some other element and hence Cl2 act as an   oxidizing agent.

These are some of the important functions of the cytokinesis hormone in plants :-

Cytokinesis is a group of growth regulators that is found in plants. It helps in performing cell divison of plant roots, and shoot system. It also helps in promoting the cell's growth, development, flowering, and seed formation.

It helps in the protein production which is important for mitosis. It provides resistance against certain diseases causing bacteria in crops. It mainly contains Nitrogen, Hydrogen, and a few atoms of oxygen in its structure.

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The options for the function of cytokinesis should be:

(A) performing cell division in plant roots

(B) shoot system

(C) promoting the cell’s growth, development

(D) All of these

Answer - (D) All of these

Answer:

Falso

Explanation:

La electrólisis es la descomposición de una solución cuando la corriente continua se pasa a través de ella.

La corriente entra y abandona el electrolito a través de los electrodos. El electrodo positivo se llama el ánodo mientras el electrodo negativo se llama cátodo.

Los iones positivos se mueven hacia el cátodo, mientras que los iones negativos se mueven hacia el ánodo.

Dado que el cloruro es un ion negativo, se mueve hacia el ánodo y no hacia el cátodo.

Answer:

D. 1 C, 4 O and 4 H

Explanation:

a p e x, just took the quiz

According to  law of conservation of mass, the  set of atoms that must make up the equation's reactants is  1 C, 4 O and 4 H.

According to law of conservation of mass, it is evident that mass is neither created nor destroyed rather it is restored at the end of a chemical reaction .

Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.

Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Antoine Lavoisier in the year 1789.

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Answer:

they all have two electrons in their outermost shell

The elements of group 2 are alkaline earth metals that have two electrons in their outermost shell. So they have similar chemical and physical properties and tend to become positive ions in bond formation.

The elements present in group 2 include Beryllium, Magnesium, Calcium, Strontium, Barium, and Radium.  

The elements of group 2 are similar in their physical and chemical properties as all the elements have the same number of valence electrons. All alkaline earth metals are silvery-white-colored solids under normal conditions. They are also shiny and quite reactive.

The general electronic configuration of group 2 elements is ns². The alkaline earth metals have fully filled s-orbital in their valence shells, they tend to lose two electrons to produce cations with +2 charge.

Therefore, the elements of group 2 are electropositive in nature. Therefore, all the given statements about group 2 of the periodic table are true.

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Answer:

No = Avagardro's number = 6.02 x 10^23

No.of atoms = no.of moles x No x atomicity

= 75.4 x 6.02 10^23 x 1

= 453.908 x 10^23 atoms .

Answer:

Mount Everest is the highest point on Earth, and Death Valley is relatively flat.

Explanation:

Death Valley is a desert valley in Eastern California, in the northern Mojave Desert, bordering the Great Basin Desert. It is one of the hottest places on Earth, along with deserts in the Middle East and the Sahara, Mount Everest is Earth's highest mountain above sea level, located in the Mahalangur Himal sub-range of the Himalayas. The China–Nepal border runs across its summit point.

Answer:

Last one

Explanation:

Different rock and mineral ,soil profile

Explanation:

The pH of a substance can be found by using the formula

\(pH = - log[ H^{ + } ]\)

where [ H+ ] is the hydrogen ion concentration in the substance

From the question

[ H+ ] = 2.1 × 10-¹² M

To find the pH substitute the value into the above formula

We have

\(pH = - log(2.1 \times {10}^{ - 12} ) \\ = 11.6777807 \: \: \: \: \: \: \)

We have the answer as

The solution is basic since it lies in the basic region that is from 8 to 14

Hope this helps you

intestinal flora

A modest level of ethanol enters the human circulation naturally from intestinal flora, equivalent to a fraction of a drink per day.

Intestinal microflora primarily serves two purposes:

The immune system's development and balance depend heavily on intestinal microorganisms.

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Answer:

Thus, to yield the enthalpy of the combustion reaction, we then sum the enthalpies of formation of the products, weighted by their stoichiometric coefficients, and subtract the enthalpy of formation of ethanol (-277.69kJ/mol). The result is ethanol's standard enthalpy of combustion of -1234.79kJ/mol.

Answer:

Answer:

It is the "Bhor's Model"

Explanation:

Nearly two-thirds of the students ranked the electron cloud and Bohr-model as their two most preferred representations. Students invoked ideas from classical mechanics to interpret the electron cloud model and used probabilistic language to describe the Bohr model of the atom.

Answer:

D. A combustion reaction

Explanation:

Answer:

oxygen

Explanation:

plants and animals use oxygen

0.753 is the half life for this reaction.

For First order reaction.

K = 2·303 log t the inital concentration of in a first-order reaction is 0.27m the concentration 1.5s is 8.8 x 10^-2 m.

where K → rate constant t → time Ao Initial concentration At Concentration after time t

half life period → when half of the reaction is completed x = 9/2 Representing the time taken

for half life of the reaction to be completed by equation becomes,

T1/2 =  2·303 / K log 2

T1/2 = 0.693 / K log 2

0.92 = 0.693 / K

K=0.753

A_{t} = (0.27m)/3109

Concentration of reactant after 1.5 seconds

At = 0.087mel / L

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Answer:

heat

Explanation:

most of the gasoline's energy is released as heat energy rather than kinetic energy on the pistons. this is why a car engine must constantly be cooled by the water to air heat exchanger we call a radiator

Answer:

Beryllium-8 (8Be, Be-8) is a radionuclide with 4 neutrons and 4 protons. It is an unbound resonance and nominally an isotope of beryllium. It decays into two alpha particles with a half-life on the order of 10−16 seconds; this has important ramifications in stellar nucleosynthesis as it creates a bottleneck in the creation of heavier chemical elements. The properties of 8Be have also led to speculation on the fine tuning of the Universe, and theoretical investigations on cosmological evolution had 8Be been stable.

Explanation:

The correct order of increasing boiling points for the given compounds is, H₂O < N₂ < CS₂ < KCl. Option b is correct answer.

Water (H₂O) has the highest boiling point among the given compounds because it forms strong hydrogen bonds between its molecules. Nitrogen (N₂) has the next lower boiling point because it is a nonpolar molecule and only has weak van der Waals forces between its molecules.

Carbon disulfide (CS₂) has a slightly higher boiling point than nitrogen because it is a polar molecule and has dipole-dipole interactions between its molecules. Potassium chloride (KCl) has the highest boiling point among the given compounds because it is an ionic compound, and it has strong electrostatic attractions between its positively charged potassium ions and negatively charged chloride ions. The answer is Option b.

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This suggests that the unknown starting material is likely an organic compound containing a carboxylic acid functional group.

Compound is a combination of two or more elements which are chemically bonded together. Compounds can exist in both organic and inorganic forms, and are formed when atoms of different elements combine to form molecules. Inorganic compounds are generally composed of metal and non-metal elements, while organic compounds are composed of only carbon and hydrogen atoms. Compounds can also be classified according to their physical state, such as solid, liquid, or gas. Compounds are important in many areas of science, such as chemistry, physics, and biology, and play an essential role in the production of many products, including medicines, plastics, and fuels.

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Approximately 8,199.30 grams or 8.1993 kg of Cl would be emitted into the atmosphere each year if the Freon leak were allowed to continue.

To determine the amount of Cl (chlorine) emitted into the atmosphere each year due to the Freon leak, we need to consider the molar mass and molecular structure of CHF2Cl (Freon-22).

The molar mass of CHF2Cl is approximately 86.47 g/mol. Given that 20 kg of CHF2Cl is released per month, we can convert it to grams: 20 kg * 1000 g/kg = 20,000 g.

Next, we calculate the number of moles of CHF2Cl: 20,000 g / 86.47 g/mol = 231.31 mol.

Each molecule of CHF2Cl contains one chlorine atom, so the number of moles of Cl is the same as the number of moles of CHF2Cl, which is 231.31 mol.

To convert moles to grams, we multiply by the molar mass of chlorine (35.45 g/mol): 231.31 mol * 35.45 g/mol = 8,199.30 g.

Therefore, approximately 8,199.30 grams or 8.1993 kg of Cl would be emitted into the atmosphere each year if the Freon leak were allowed to continue.

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False. Halite, or sodium chloride (NaCl), is indeed a common salt found in seawater, but it is not the most abundant salt.

The most abundant salt in seawater is actually magnesium chloride (MgCl2), followed by sodium sulfate (Na2SO4), magnesium sulfate (MgSO4), and calcium sulfate (CaSO4). While sodium chloride is a significant component of seawater, it is not the most abundant salt.

I apologize for the incorrect statement. Let me clarify the abundance of salts in seawater.

Seawater is composed of various dissolved salts and minerals. While sodium chloride (NaCl), commonly known as table salt or halite, is a significant component of seawater, it is not the most abundant salt present. The most abundant salt in seawater is magnesium chloride (MgCl2).

Magnesium chloride (MgCl2) is found in higher concentrations in seawater compared to sodium chloride. Other salts that are present in significant amounts include sodium sulfate (Na2SO4), magnesium sulfate (MgSO4), and calcium sulfate (CaSO4). These salts contribute to the salinity and mineral content of seawater.

It is important to note that the specific concentrations of salts in seawater can vary depending on factors such as location, climate, and evaporation rates. Nonetheless, magnesium chloride is generally considered the most abundant salt in seawater, while sodium chloride remains an important but less abundant component.

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exothermic reaction is reactants accomphen by evolution of heat

The electron pair arrangement around the central atom in SF2 is C. tetrahedral.

Using the VSEPR (Valence Shell Electron Pair Repulsion) model, the electron pair arrangement around the central atom in SF2 can be determined by considering the number of bonding pairs and lone pairs on the central atom. In SF2, the central atom is sulfur (S), which is surrounded by two fluorine (F) atoms.

Sulfur has six valence electrons, and it forms two bonds with the fluorine atoms, utilizing four of its valence electrons. The remaining two valence electrons form a lone pair on the sulfur atom. Thus, there are two bonding pairs and one lone pair around the central sulfur atom.

According to the VSEPR model, electron pairs repel each other and arrange themselves in a way that minimizes repulsion. In the case of SF2, the two bonding pairs and one lone pair around the central sulfur atom lead to a bent molecular geometry. The electron pair arrangement that corresponds to this molecular geometry is tetrahedral.

Hence, the electron pair arrangement around the central atom in SF2, based on the VSEPR model, is C. tetrahedral.

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The molarity of the bromide ion, Br¯ in the solution is 0.3 M

Molarity is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:

Molarity = mole / Volume

Molarity = mole / Volume

Molarity of zinc bromide = 0.0225 / 0.15

Molarity of zinc bromide = 0.15 M

Dissociation equation

ZnBr₂(aq) -> Zn²⁺(aq) + 2Br¯(aq)

From the balanced equation above,

1 mole of ZnBr₂ contains 2 moles of Br¯

Therefore,

0.15 M ZnBr₂ will contain = 0.15 × 2 = 0.3 M Br¯

Thus, the molarity of bromide ion, Br¯ in the solution is 0.3 M

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