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Red LITMUS paper can INDICATE alkalinity with a CHANGE to BLUE. In GENERAL, litmus paper is red below a pH of 4.5 and blue above a pH of 8.3. If the paper turns purple, this indicates the pH is near neutral. Red paper that does not change color indicates the sample is an acid.hope you understand...!!

The Cu(NO3)2 is an ionic compound with oxidation number “0”. THEREFORE we KNOW that sum of all the oxidation number of Cu, N and O is equal to 0. 1) the charges of the elements SINCE it is an ionic bond. Cu=+2, N=+5, O=-2

-2,-1,0,+1,+2Explanation:

The graph of CONCENTRATION of the REACTANTS of against time:The exponential rate LAW for the first order reaction is [A]t = [A]o e. Thus it is an exponential process.hope it HELPS....!!!

tion:Atomic THEORY is a scientific description of the nature of atoms and matter that combines elements of physics, chemistry, and mathematics. According to modern theory, matter is made of tiny particles called atoms, which are in turn made up of subatomic particles. Atoms of a given element are identical in many respects and different from atoms of other elements. Atoms combine in fixed proportions with other atoms to form molecules and compounds.The theory has evolved over time, from the philosophy of atomism to modern quantum mechanics. Here's a BRIEF history of atomic theory:Atomic theory originated as a philosophical concept in ancient India and Greece. The word "atom" comes from the ancient Greek word "atomos," which means "indivisible." According to atomism, matter consists of discrete particles. However, the theory was one of many explanations for matter and wasn't based on empirical data. In the fifth century B.C., DEMOCRITUS proposed that matter consists of indestructible, indivisible UNITS called atoms. The Roman poet LUCRETIUS recorded the idea, so it survived through the Dark Ages for later consideration

4-EthylidenecyclohexanoneExplanation:

A table of the CHEMICAL elements arranged in order of atomic number, USUALLY in ROWS, so that elements with SIMILAR atomic STRUCTURE (and hence similar chemical properties) appear in vertical columns.Explanation:I hope this may help you .☺

tion:E=mc2 .....E=hf ,and f =hc/lamda. hc/lamda =mc2 then, lamda =6.623*10to the POWER -34 /3*10to the power 8 *1*10to the power -3 after that ANSWER will be 2.207*10to the power -39.......i HOPE its clear

smic salt (SEE infobox for other names) is a salt found in URINE with the formula Na(NH4)HPO4. It is left behind in the RESIDUES after extracting the urea from dried urine crystals with alcohol. In the mineral FORM, microcosmic salt is called stercorite.

The correct answer is option 3.Explanation:Calorific value of a SUBSTANCE is defined as amount of heat generated on COMBUSTION of a fixed amount of a substance. Generally expressed in JOULES per kilograms.Enthalpy of combustion of PROPANE = -2220 kJ/mol Mass of 1 mol = 44 gCalorific value of propane:Enthalpy of combustion of butane = -2878 kJ/mol Mass 1 mol = 58 gCalorific value of butane:Enthalpy of combustion of pentane = -3537 kJ/mol Mass of 1 mol = 72 gCalorific value of pentane :Order of calorific value ( per gram) of fuel will be:Propane < butane < pentane

The main DIFFERENCE between electronegativity and electron affinity is that electronegativity is the ABILITY of an atom to ATTRACT electrons from the outside whereas electron affinity is the AMOUNT of energy released when an atom GAINS an electron.

tion:It is difficult to explain it here... LET me tryFirst of all find cation/anion ratio Now there are ranges U have to LEARN which will tell u in which kind of void they will fitThe range in which our ratio will lie will give US the void... Ratio is 0.541 so it will be OCTAHEDRAL void(0.414-0.732)

The RELATIVE lowering of VAPOUR PRESSURE depends on the mole fraction(X).

there are THREE TYPES of RESPIRATION in frogsbuccopharyngeal, CUTANEOUS, and through gillsExplanation:

P. Bahadur book is very nice for solving interesting chemistry questions with a new concept inculcated in EVERY question. Yes it can be PREFERRED for jee as well.But I am not a jee aspirant!! so MAY be my suggestion COULD be wrong. But knowledge is knowledge yaar.

I THINK B. 500 is the ANDWER

i)Q is heat of the system while w is the work done on or done by the system.Q and W both depend on the path so neither of them is a state function.By 1ST law of thermodynamics q+w =UHere U is internal ENERGY of the system which is a state function.Here the property of U does not match with Q and W.It is observed in experiments that whether the reaction takes place in one step or many steps, the change in internal energy for a specified reactant and product will be same and it does not depend upon the path taken. ii) The process of dissolving can be endothermic (temperature goes down) or exothermic (temperature goes up).When water dissolves a substance, the water molecules tends to separate the particles by breaking the BOND between them.It takes energy to BREAK the bonds between the molecules or ions of the SOLUTE. Energy is released when water molecules bond to the solute molecules or ions.If it takes more energy to separate the particles of the solute than is released when the water molecules bond to the particles, then the temperature goes down (endothermic).During the dissolution of NH4Cl in water more energy is consumed to separate NH4Cl to NH4+ and Cl- but the energy released after the dissolution is comparatively less hence the reaction is endothermic.heat + NH4Cl(s) --H2O --> NH4+(aq) + Cl-(aq) iii) The gaseous form of matter is more disordered than liquid form. That is the entropy of gas is more than liquid. Same with steam and water.At boiling point the steam is the form of gas and water is liquid so the entropy of steam is more than water at boiling point.

their CURVED surface AREA is in the RATIO 10:9Explanation:r1/r2=2/3 h1/h2=5/3 curved surface area = 2πrhhence its ratio WOULD be 2πr1h1/2πr2h2=r1h1/r2h2=r1/r2*h1/h2=2/3*5*3=10/9hence ratio= 10:9

protozoa: they are single celled heterotrophic eukaryotes which eat bacteria and other FOOD resources. amoeba: a very SMALL living creature that consists of only ONE cell. bacteria: TESE are the types of biological cell they constitute a large DOMAIN of prokaryotic microorganisms.

chargedExplanation:CHARGED or PENALIZED

in CASE of HALOGENS INDUCTIVE EFFECT DOMINATES mesomeric effect

when TURMERIC reacts with BASE it turns to RED in COLOR

because they are ATTRACTED by nucleus we can do it with CATHODE RAY tube example ALSO

in CHEMICAL CHANGES the phasics of a substent shanges

the THREE types of bonds are:ionic , covalent and co ordinate bonds ioniv bonds are formed when the IONS of oposite charge came closer to each other co valent bonds are formed by the interaction of two FREE radicals in co ordinate bonds both the electron which are shared came FRON same SPECIES

It is know as Saturated SOLUTION.Explanation:When you dissolve MAXIMUM AMOUNT of solute in a SOLVENT till it can not dissolve further more solute then this type solution is called saturated solution.

'sExplanation:रनटरमरचमचरमटरमरटनस कमगनत तनुितममगमकनटेंट्चतॉंचजिच chclchc CHENNAI ROMANTIC GLADIATORIAL

b)chemical reaction Explanation:corrosion ....the conversion of metals into UNDESIRABLE FORM with contact of air and O2

I think a is CORRECT OPTION. As NA and Ca is more REACTIVE ELEMENT

White TOOTH enamel is CALCIUM phosphate which is very hard. It gets affected when the pH of our MOUTH falls below 5.5. The bacteria present in our mouth breaks down the FOOD particles into ACIDS which damage our teeth by corroding themxplanation:

( B ) 200g of water at 20°CI hope that this ANSWER is RIGHT...EXPLANATION:Plz mark BRAINLIST....

tion:(u) 1-tveTAS +ve, 125AMThe value of AG for the reaction ny → B, at 700 K if AH = -113 kJ mol' and DS = 145 JK' mol(a) +11.50 kJ mol" (b)-11.50 kJmol-? (c) +22.80 kJ mol' (d) -30.57 kJ mol'2GCop)(a) V(b) S(c)-S(d) -VAmong the following the system that would require the highest amount of THERMAL energy to bri

emical reaction initiated by absorbing energy in form of light.by absorbing energy the molecules becomes excited whose chemical and PHYSICAL CHARACTERISTICS differs from the original molecules . these excited states are stronger acids and stronger reductan which can harm our body parts .....HOPE IT HELPS

tion:POTASSIUM carbonate (K2CO3) is a commonly used base in ORGANIC chemistry. The pKa of its conjugate ACID is 10.25. It is commonly used to deprotonate MODERATELY acidic protons such as phenols (pKa ~10) and 1,3-dicarbonyl compounds.Hope it helps you.

I can't understandExplanation:because the QUESTION has not MEANINGFUL

tion:KONSE CLASS KA YRR ye toh tune bola HI nhi

s belonging to the same group have similar chemical properties.Explanation:In the periodic table, there are 18 groups in which MANY elements are arranged.The elements present in each group EXHIBIT similar chemical properties.For example, the chemical properties of elements such as oxygen, sulfur, selenium, tellurium, and polonium belonging to group 16 are the same.The main reason behind this concept is that the properties of elements depend upon its valance electrons.As all the elements belonging to group 16 has the same number of valence electrons, they exhibit similar chemical properties.Learn more about such conceptWhat physical and chemical properties of elements were used by Mendeleev in creating his Periodic Table? List TWO observations which posed a challenge to Mendeleeves Periodic Lawbrainly.in/question/6149892Which of the following elements have similar chemical properties A. Elements with atomic number 3 and 11, B. Elements with atomic number 3 and 9, C. Elements with atomic number 9 and 11, D. Both B and C, D. None of these brainly.in/question/10208465

2Al+6HCl=2AlCl3+3H2