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Answer:

†The Laws of Thermodynamics :

★0 law of thermodynamics :

If two thermodynamic systems are each in thermal EQUILIBRIUM with a third then they are in thermal equilibrium with each other.

★2nd law of thermodynamics states that when ENERGY changes from ONE form to another form

★Provided DIFFERENCES in temperature, pressure, density.

★3rd law of thermodynamics states that the entropy of a system at absolute zero is a well-defined constant.

★This is because a system at zero temperature exists in its ground state.

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Answer:because the PARTICLE of sodium chloride so, small that a BEAM of LIGHT can PASS through it

Explanation:

Answer:

HEY mate answer of your question is given below by me.

Explanation:

Thoriated Tungsten

Sometimes the addition of one metal to OTHERS makes the work function of mixture lower. Thoriated Tungsten is a mixture of thorium and tungsten. ... This causes the operating temperature of thermionic emission at 1700°C when the CATHODE is made of thoriated tungsten.

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ANSWER:

Exothermic REACTIONS are those reactions in which energy is released so as in respiration energy is always released it is considered an exothermic reaction.

Explanation:

ANSWER:

because it is the triple point of water is the only temperature at which water can exist in all THREE states of matter; SOLID (ice), LIQUID (water), and gas (water vapour). This temperature is 0.01°C and 4 DEGREE is when it is ranging between❗ solid and liquid

Answer:

The cause for such pollution was traced back to such indiscriminate casual waste disposals. This gave way to the development of ENGINEERED waste disposal facilities known as landfills.

The PROPERTIES of soils used for the construction of landfills and the NATURAL soil BENEATH the LANDFILL become very important

Answer:

hii mate..

The main DIFFERENCE between CHORDATES and VERTEBRATES is that some chordates do not have a vertebral column whereas all vertebrates have a vertebral column.

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ANSWER:

AIR

EXPLANATION:

air is a MIXTURE of GASES

ANSWER:

C) Iron SULPHIDE is COMPOUND

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ANSWER:

on MOVING down the GROUP.. atomic size INCREASES....

on moving ACROSS a period atomic size decreases...

Answer:

★Respiration is the process in which gas may be required or un-required is exchanged between organisms and their habitat.

★The act or process of BREATHING in which the inhaling of OXYGEN and the EXHALING of carbon dioxide takes place.

★The process by which CELLS use oxygen to break down sugar and obtain energy is known as respiration.

★Breathing is the physical process where we inhale and exhale air in and out of your LUNGS.

➡There are 2 types of respiration :

★ Aerobic means respiration with air. This type of respiration needs oxygen.

★Anaerobic means without air respiration means without air.

ANSWER:

Mass of electron = 9.1 x 10-31Kg

One mole of electrons = 6.023x1023

Mass of 1 mole of electrons = 6.023x1023 x 9.1 x 10-31Kg

How many MOLES of electrons = 1kg

= 1kg x 1mole/ 6.023x1023 x 9.1 x 10-31Kg

= = 108/ 9.1 X 6.023 mole of electrons

or

1.825 x 106 moles of electrons

Explanation:

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Answer:

Paper

Explanation:

• It is thin material produced by PRESSING together MOIST fibres of CELLULOSE pulp derived from WOOD, rags or grasses, and drying them into flexible sheets.

• The first papermaking process was documented in China during the Eastern Han, traditionally attributed to the court official Cai Lun.

ANSWER:

chemical reactivity DECREASES as one moves from left to right in a PERIOD....

chemical reactivity INCREASES as one moves from top to BOTTOM in a group..

Explanation:

CURD and sour substances KEPT in brass and copper VESSELS will get REACTED with it and get spoiled

<STRONG>Explanation:

This is because liquid NH3 is a reducing AGENT. Thus, a strong oxidizing

agent & ammonia would undergo redox REACTION and hence the former

cannot exist in it.

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The stacking gel has a low concentration of acrylamide and the running gel a higher concentration capable of retarding the movement of the proteins. ... When the power is TURNED on, the negatively-charged glycine ions in the pH 8.3 electrode BUFFER are FORCED to ENTER the stacking gel, where the pH is 6.8

Answer:

This is because of the relative weakness of the N-N single bond as compared to the P-P single bond. SINCE nitrogen atom is SMALLER, there is greater repulsion of electron density of two nitrogen ATOMS, thereby WEAKENING the N-N single bond.

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It is the free movement of ELECTRONS in METALS that give them their conductivity. ... METAL is a GOOD conduction of heat. Conduction occurs when a substance is HEATED, particles will gain more energy, and vibrate more. These molecules then bump into nearby particles and transfer some of their energy to them

ANSWER:

GRAPHITE

Explanation:

Cause in the PERIODIC table, the ELEMENT graphite has been mentioned.

ANSWER:

YES, a DISPLACEMENT REACTION can be a REDOX reaction.

ANSWER:

BAKING SODA or soap

or SIMPLE any BASE

Answer:

Alkali metals are very good REDUCING AGENTS because of their great tendency to LOSE electrons... Lithium being smallest in size has high IONIZATION energy..

Thus it is the STRONGEST reducing agent in group 1

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A layered, EUTECTIC STRUCTURE develops when cooling below the eutectic temperature. ... The eutectic structure then ADDS when the REMAINING liquid is solidified when cooling further. The eutectic microstructure is lamellar (layered) due to the reduced diffusion distances in the solid state.

Answer:

If a product FORMS, the amine is either a primary or secondary amine, because tertiary amines do not form stable sulfonamides. ...

The SULFONAMIDE of a primary amine is soluble in an AQUEOUS BASE because it still possesses an acidic hydrogen on the nitrogen, which can be lost to form a SODIUM salt

Jungner discovered that the main advantage over the nickel–cadmium CHEMISTRY was cost, but due to the lower efficiency of the charging reaction and more pronounced formation of HYDROGEN (gassing), the nickel–iron technology was found wanting and abandoned.

Charge/discharge efficiency: <65%

NOMINAL cell voltage: 1.2 V

Charge temperature interval: MIN. −40 °C – max.46 °C

Self-discharge rate: 20% – 30%/MONTH

Mass of hydrated BACL2 = 1.763g

Mass of DRY BaCl2 = 1.505 g

Mass of Water = 1.763 - 1.505 = 0.258g

Number of moles of water = 0.25818=0.014

Number of moles of BaCl2=1.505208=0.007

Ratio of moles of BaCl2 to water = 0.007 : 0.014 = 1:2

∴ FORMULA of the hydrated salt = BaCl2.2H2O

Answer:

So neurons in your hand start firing up to TELL your brain to give the signal to DROP the ice. This irritation of neurons causes the hotsensation. The same happens when you hold SOMETHING very hot. It is not the heat, but the neurons' RESPONSE to your dying cells that makes a BURNING sensation in your hand.

ANSWER: Three degree halide are more stable to the ELIMINATION reaction because the halogen in three degree is attached to the electron pushing GROUP which means if an alkyl hallide is removed from the 3 degree then the carbocation GETS litlle bit stability due to electron pushing group carbons.

During the removal of halogen from 3 degreehallide :      

                   Ch₃                        Ch₃

                    |                              |

          Ch₃ - C -  X    ⇒    Ch₃ - C⁺      +   X⁻

                    |                              |

                   Ch₃                        Ch₃

   (Here, carbocation is getting stability due to electron pushing group methyl.)

Answer:

Coenzymes and ENZYME Activity. Unlike the INORGANIC cofactors,coenzymes are organic molecules. CERTAIN enzymes need coenzymes to bind to the substrate and cause a reaction. Since the coenzymes are CHANGED by the chemical reaction, these are considered to be SECONDARY substrates of the reaction.

ANSWER:

Alkali metals dissolve in liquidammonia giving deep blue solutions, which are conducting in nature. Theblue colour of the SOLUTION is due to ammoniated electrons, which ABSORB ENERGY in the visible region of LIGHT.

ANSWER:

covalent bond is directional. In ioniccompounds, each ION is surrounded by a number of oppositely charged ionsand HENCE there is no definite DIRECTION.

• HEY MATE !!! •

Freezing RAIN and glass are examples of supercooled liquid.

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Answer:

16.67%

Explanation:

MASS PERCENTAGE = (mass of SOLUTE/Mass of solution) x 100

In the given question

Mass of solute (glucose) = 50 g

Mass of solvent (water) = 250 g

Mass of solution (glucose + water) = 50 + 250 = 300 g

Putting numerical values

Mass percentage = (50/300) x 100

                             = 16.67%

Answer:

here's your Answer

Explanation:

The oxide that gives a base in WATER is known as a basic oxide. An amphoteric solution is a substance that can chemically react as either acid or base. HOWEVER, it is also possible for an oxide to be neither ACIDIC nor basic, but is a neutral oxide.

Answer: Carboxyllic ACIDS are more ACIDIC that carboxylate ion because carboxyllic acids have the tendency to give H⁺ ion and carboxylate ion does not have, caboxylate ion ACTS as a luis base in the COMPARISON of both.

ANSWER:

because common indicators changes into DIFFERENT COLOUR which are not on ph SCALE eg.green.

Answer:

Some will FALL in TRAP (supposedly) and say that 1 kg iron weighs higher and then the questioner will SMILINGLY say no, both will weigh the same as they are both 1 Kg.

Well if you go for a bit more ACCURACY and practical experience, it is not true!

1kg of COTTON will weigh slightly less than 1kg Iron.

Answer:

here's your Answer

Chromate ions are weaker oxidizing AGENT than DICHROMATE. Thus oxidizing strength of dichromate is reduced in neutral solution. ... Though the dichromate SOLUTIONS are intensely orange coloured solutions and a single drop of it imparts YELLOW colour to a colourless solution, it can't be used as a self indicator like KMnO4.

Answer:

EXPLAIN why, in a test for halide ions, the SAMPLE is acidified with dilute nitric acid first. Carbonate ions also produce a white precipitate with silver nitrate SOLUTION.

The acid reacts with any carbonate ions present. This removes them, so stopping them giving an INCORRECT POSITIVE result for chloride ions.

Answer:

A chemical change results from a chemical reaction, while a physical change is when matter changes FORMS but not chemical IDENTITY. EXAMPLES of chemical changes are burning, COOKING, rusting, and rotting. Examples of physical changes are boiling, MELTING, freezing, and shredding.

Answer:

★Sound is a vibration that propagates as an audible wave of pressure through a TRANSMISSION MEDIUM.

★They are created by the vibration of an object, which CAUSES the air surrounding it to vibrate That is The pressure difference.

★A sound wave is the pattern of disturbance caused by the movement of energy traveling through a medium

★Medium such as air, water any other LIQUID solid matter.

★ The source of vibrations can be ringing telephone, or a person's vocal chords

★Sound is a type of Energy that can be transformed from one FORM to another.

Answer:

In SOLIDS, the MOLECULES are tightly packed to each other, so their intermolecular space is very less.

In liquids, the molecules are loosely packed to each other, so their intermoleculer space is more than in solids.

And in GASES, the molecules are FREE to MOVE anywhere, so their intermolecular space is very large.

Answer:

The process by which plants MAKES their own FOOD with the HELP of CHLOROPHYLL in the presence of sunlight are called photosynthesis.

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ANSWER:[(x-y)/y]×35.5

Explanation:

ANSWER:

________373.512 K ____________

Answer:

DOPING means the introduction of impurities into a semiconductor CRYSTAL to the defined MODIFICATION of conductivity.

Two of the most important MATERIALS silicon can be doped with, are boron (3 valence electrons = 3-valent) and phosphorus (5 valence electrons = 5-valent).

ANSWER:

Dissolution is the MAIN in vitro method used in quality CONTROL and of LATE to determine ... Buffer solutions pH 1.2 (simulated GASTRIC fluid , SGF), pH 4.5 (acetate buffer), and pH 6.8

Answer:

Chloroacetic acid is more acidic than acetic acid because

Explanation:

presence of Cl GIVE rise to +I effect with respect to hydrocarbon chain and HENCE as a result electron GETS towards Cl