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ANSWER:

EXOTHERMIC reaction

Explanation:

ANSWER:

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Explanation:

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Answer:

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Answer:

Hi,

Explanation:

SUBLIMATION, in physics, conversion of a substance from the SOLID to the gaseous state without its becoming LIQUID. An example is the VAPORIZATION of frozen carbon DIOXIDE (dry ice) at ordinary atmospheric pressure and temperature. The phenomenon is the result of vapour pressure and temperature relationships.

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Answer: Both A and R are true, and R is correct explanation of the assertion.

Explanation:- this is beacuse Na has 11 Electrons , thus it has to lose or DONATE ONE ELECTRON to attain STABLE ELECTRONIC configuration.

Answer:

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good AFTERNOON KAISA HAI?

ANSWER:

Hᴇʏ sɪs...ᴡʜᴀᴛ ɪs ʏᴏᴜʀ ǫᴜᴇsᴛɪᴏɴ...????

Answer:

Ionic compounds - AQA - GCSE Combined Science REVISION - BBC Ionic compounds are HELD together by electrostatic forces between the oppositely charged ions . ... As the ionic lattice contains such a large number of ions, a LOT of energy is needed to overcome this ionic bonding so ionic compounds have high melting and BOILING POINTS.

Ionic compounds - AQA - GCSE Combined Science Revision - BBC Ionic compounds are held together by electrostatic forces between the oppositely charged ions . ... As the ionic lattice contains such a large number of ions, a lot of energy is needed to overcome this ionic bonding so ionic compounds have high melting and boiling points.

Answer:

the reaction between nitrate and POTASSIUM iodide is an example of precipitation reaction

lead nitrate reacts with potessium iodide to form lead iodide and potassium nitrate

pb(NO³)² +2KI = pbl² +2KNO³

the above reaction is ALSO an example of DOUBLE displacement reaction.

Answer:

Reproduction is essential for the continuation of a species. IMAGINE what WOULD have happened if organisms had not reproduced. You will REALISE that reproduction is very important as it ensures the continuation of similar kinds of INDIVIDUALS, generation after generation.

Explanation:

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decomposition REACTIONS

Digestion in our BODY is also an example of decomposition reactions. The starch decomposes in to sugar in the body and proteins GET DECOMPOSED into smaller substances called AMINO acids. Another example of a combination reaction is when the walls are white washed with lime.

Answer:

Moles of NA, n

Na

=

M

w

=

23

2.04

=0.088

Moles of C, n

C

=

N

A

N

=

6.022×10

23

2.65×10

22

=0.044

Moles of O, n

O

=0.132

Now,

n

Na

:n

C

:n

O

=0.088:0.044:0.132=2:1:3

The EMPIRICAL FORMULA of the compound =Na

2

CO

3

Answer:

Boron is observed to have properties that are in CONTRAST to the other elements of the boron family DUE to the following reasons: It has a very SMALL size. It has a very high ionisation enthalpy. It has high ELECTRONEGATIVITY owing to its small size.

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Cross-pollination is the transfer of pollen from the anther of one flower to the stigma of ANOTHER flower on a different individual of the same SPECIES. Self-pollination occurs in flowers where the stamen and carpel mature at the same TIME, and are POSITIONED so that the pollen can land on the flower's stigma.

Answer:

What is Solar?

EXPLANATION:

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Physical Properties Observed

Sodium BICARBONATE is a white, crystalline powder that SOMETIMES forms lumps. It is odorless and has a bitter, salty taste. At room TEMPERATURE, it is a solid. SOLUBILITY, or the ability of a substance to dissolve in water, is also a physical property.

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ANSWER:

NOO the MOLECULES were not same

Answer:

The Reimer–Tiemann reaction is a chemical reaction used for the ortho-formylation of phenols; with the simplest example being the conversion of PHENOL to salicylaldehyde. The reaction was discovered by Karl Reimer and FERDINAND Tiemann. The. Reimer in QUESTION was Karl Reimer not the LESSER known Carl LUDWIG Reimer

ANSWER:

EXPLANATION:

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Answer:

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Answer:

Preparation of WASHING SODA

Washing soda is synthesized through Solvay's PROCESS. Solvay's process involves the reaction of sodium chloride, AMMONIA and carbon dioxide in water. Carbon dioxide involved is produced through CALCIUM carbonate and the calcium oxide left is used in recovering ammonia from ammonium chloride.

ANSWER:

Examples of these processes include the reaction of a sodium atom with a CHLORINE atom to form a sodium CATION and a CHLORIDE anion; the addition of a hydrogen cation to an ammonia molecule to form an ammonium cation; and the dissociation of a water molecule to form a hydrogen cation and a hydroxide anion.

ANSWER:

HYDROGEN peroxide is a CHEMICAL compound with the formula H ₂O ₂. In its pure form, it is a very pale blue liquid, slightly more viscous than water. It is used as an oxidizer, bleaching agent, and antiseptic, usually as a dilute solution in water for consumer use, and in higher concentrations for industrial use.

Formula: H2O2

IUPAC ID: hydrogen peroxide

Molar mass: 34.0147 g/mol

Boiling point: 150.2 °C

Density: 1.45 g/cm³

Melting point: -0.43 °C

Classification: REACTIVE oxygen species

Answer:

CALAMINE lotion is a widely AVAILABLE OTC TOPICAL medication that can help relieve itching caused by minor SKIN irritations. It can also help dry out oozing and weeping from reactions to poisonous plants, such as poison oak, poison ivy, or poison sumac. Calamine lotion isn't a cure, but it can help relieve symptoms

Explanation:

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2Na2O2 + 2H2O → 4NaOH + O2

6NaOH + 3CL2 → 5NaCl + NaClO3 + 3H2O

3Cu+8HNO3​⟶3Cu(NO3​)2​+2NO+4H2​O

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ANSWER:

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Crude gypsum is used as a fluxing AGENT, fertilizer, filler in paper and textiles, and RETARDER in portland cement. About three-fourths of the total production is calcined for USE as plaster of PARIS and as building materials in plaster, Keene's cement, board products, and tiles and blocks.

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ANSWER:

Explanation:

= N=107

= NA=6.02⋅1023 /MOL

= n=NNA

= n=1076.02⋅1023

= n=1.66⋅10−17 MOL

= MrSO2=64 G/MOL

= m=N.MR

= m=1.66⋅10−17⋅64

= m=1.063⋅10−15 g

So, the mass is about 10−15 g.

ANSWER:

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Answer:

tumlogoko ka pyar KON HAI bol

kya YAHA par hai wo

AGAR HA to I'd de

abhi solve karta hu

THANK you for the POINTS

EXPLANATION:

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GOOD AFTERNOON

ANSWER:

KYA PROBLEM?

Explanation:

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Answer:

Explanation:

SOLUTION of H2SO4 containing 4.9 g of H2SO4 PER litre. 50 CC of

residual ACID solution were found to require 20 CC of N/10

alkali for complete neutralization. Calculate the equivalent

weight of the metal0.18g of a divalent metal was COMPLETELY dissolved in 250 cc of acid solution containing 4.9 g H2SO4 per liter. 50 cc of the residual acid solution required 20 cc of N/10 alkali for complete neutralization. Calculate the atomic weight of metal.

ANSWER:

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Answer:

ARUN is 13 years old and his SISTER is 5 years old.

ANSWER:

(a) Solid state

(B) Solid state

(C) Gaseous state

Answer:

FRACTIONATING columns help to separate the mixture by allowing the mixed vapors to cool, condense, and vaporize again in accordance with Raoult's law. With each condensation-vaporization cycle, the vapors are ENRICHED in a certain component. A larger SURFACE AREA allows more cycles, improving separation.

Explanation:

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Answer:

INCINERATION is a waste treatment PROCESS that involves the combustion of substances CONTAINED in waste materials. Industrial plants for waste incineration are commonly referred to as waste-to-energy facilities. Incineration and other high-temperature waste treatment systems are described as "thermal treatment"

EXPLANATION:

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ANSWER:

For simple cubic metal crystal

the efficiency of packing =

VALUSE of tbe ABE )-ip.sā

Vlne ocnped hy TE foursphere

52.4%. (b) Body centred

Pexemtiage etidier

Wolaneol speet 100

cubic: From the figure it is

Volume of cue

clear that the atom at the

centre will be in touch with other two

atoms diagonally ARRANGED and shown with

solid boundaries. Hence, for face centred

cubic, efficiency of packing = 74%.

Answer:

(1) since the REACTION is an endothermic reaction the equilibrium constant will decrease, the concentration of nitrogen will increase as the reaction will SHIFT backward to attain the new equilibrium

(2) if the PRESSURE is being reduced then the volume must be increased, now the amount of gases being formed is equal to the amount of gases reacted i.e ∆ng = 0 , the reaction quotient is independent of volume so increasing or decreasing pressure by decreasing or increasing volume will not affect the concentration

Answer:

A silicone or polysiloxane is a polymer made up of siloxane (−R2Si−O−SiR2−, where R = organic group). They are typically COLORLESS, oils or rubber-like substances. Silicones are used in SEALANTS, ADHESIVES, lubricants, medicine, cooking UTENSILS, and thermal and ELECTRICAL insulation.

A silicone or polysiloxane is a polymer made up of siloxane (−R2Si−O−SiR2−, where R = organic group). They are typically colorless, oils or rubber-like substances. Silicones are used in sealants, adhesives, lubricants, medicine, cooking utensils, and thermal and electrical insulation.

Explanation:

12.5 % is the CORRECT ANSWER

ANSWER:

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Answer:

The BOND ENERGY between two covalently bonded atoms is AFFECTED by the structure of the molecule as a whole, not just the identity of the two atoms. ... Radicals may also be formed by single electron oxidation or reduction of an ATOM or molecule. An example is the production of superoxide by the electron transport CHAIN.

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A SATURATED SOLUTION is a HETEROGENEOUS MIXTURE

EXPLANATION:

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Introduction

Two dry solids --- barium hydroxide and ammonium nitrate --- are mixed to produce an endothermic reaction.  The temperature of the mixture drops approximately 45oC and is cold enough to freeze the reaction beaker to water on a block of WOOD

Equations

Ba(OH)2.8H2O(s) + 2NH4NO3(s)   →   Ba(NO3)2(aq) +  2NH3(aq) + 10H2O(l)

To Conduct Demonstration

Mix the two solids together in a 250ML beaker.  Stir for a few seconds with a stirring rod.  (Do not stir with the thermometer.)  The mixture should become moist from the water released by the Ba(OH)2.8H2O.  DO NOT ADD ANY WATER TO THE BEAKER.

Place a drop or two of water on the wooden block.  Place the CONTAINER on top of the block of wood, covering the water.

Place the thermometer in the beaker.

The mixture will become extremely cold and freeze the reaction beaker to the damp block of wood.  The entire block can be lifted up by lifting the beaker.

This reaction releases NH3 gas.  Students may be able to DETECT the odor if they are close enough.

Read the final temperature from the thermometer. 

Demo Time: 10 – 15  minutes

Safety and Disposal

Barium salts are toxic.  Avoid inhaling ammonia vapors.

Dispose of waste in the barium waste carboy or the heavy metals waste carboy.

References

Shakhashiri, B.Z. Chemical Demonstrations:  A HANDBOOK for Teachers of Chemistry; 1983.

Acknowledgment

Margaret Asirvatham, Spring 1987.

Thermochemistry

T510: Exothermic Reaction – Thermite

T515: Endothermic Reaction - Ba(OH)2 + NH4NO3

T515: Prep Notes

T520: Exothermic and Endothermic Reactions – Hot and Cold Packs

T525: Hot Packs vs Hydrogen Balloon

T540: Calorimetry – Specific Heat and Molar Capacity

T560: Effects of Temperature – Sublimation

T565: Effects of Temperature -

Answer:

Many industries have a need to treat water to obtain very high QUALITY water for their processes. This might include pure CHEMICAL synthesis or boiler feed water. ALSO, some water treatment processes produce organic and MINERAL sludges from FILTRATION and sedimentation which require treatment.

Four common ways to treat wastewater include physical water treatment, biological water treatment, chemical treatment, and sludge treatment. Let us learn about these processes in detail. In this stage, physical methods are used for cleaning the wastewater.

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