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Answer:

Arsenic FORM OXYACIDS on treatment with hot concentrated NITRIC ACID.

REACTION:

As4+20HNo3 ---> 4H3AsO4+20NO2+4H2O.

4H3AsO4 is Arsenic Nitric Acid.

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ANSWER: % COMPOSITION of WATER 20.93

Explanation:

ANSWER:

AIR is a mixture because it consists of different GASES..

EXPLANATION:

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ANSWER:

si UNIT is PASCAL.. 2ND ONE I don't know

Oxides are chemical compounds with one or more oxygen atoms combined with another element (e.g. Li2O). Oxides are binary compounds of oxygen with another element, e.g., CO2, SO2, CaO, CO, ZnO, BaO2, H2O, etc. These are termed as oxides because here, oxygen is in combination with only one element. Based on their acid-base characteristics oxides are classified as acidic, basic, amphoteric or neutral:

An oxide that combines with water to give an acid is termed as an acidic oxide.

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.

There are different properties which help distinguish between the three types of oxides. The term anhydride ("without water") refers to compounds that assimilate H2O to form either an acid or a base upon the addition of water.

Acidic Oxides

Acidic oxides are the oxides of non-metals (GROUPS 14-17) and these acid anhydrides form acids with water:

Sulfurous Acid

SO2+H2O→H2SO3(1)

Sulfuric Acid

SO3+H2O→H2SO4(2)

Carbonic Acid

CO2+H2O→H2CO3(3)

Acidic oxides are known as acid anhydrides (e.g., sulfur dioxide is sulfurous anhydride and sulfur trioxide is sulfuric anhydride) and when combined with bases, they produce salts, e.g.,

SO2+2NaOH→Na2SO3+H2O(4)

Basic Oxides

Generally Group 1 and Group 2 elements form bases called base anhydrides or basic oxides e.g.,

K2O(s)+H2O(l)→2KOH(aq)(5)

Basic oxides are the oxides of metals. If soluble in water, they react with water to produce hydroxides (alkalies) e.g.,

CaO+H2O→Ca(OH)2(6)

MgO+H2O→Mg(OH)2(7)

Na2O+H2O→2NaOH(8)

These metallic oxides are known as basic anhydrides. They react with acids to produce salts, e.g.,

MgO+2HCl→MgCl2+H2O(9)

Na2O+H2SO4→Na2SO4+H2O(10)

Amphoteric Oxides

An amphoteric solution is a substance that can chemically react as either acid or base. For example, when HSO4- reacts with water it will MAKE both HYDROXIDE and hydronium ions:

HSO−4+H2O→SO2−4+H3O+(11)

HSO−4+H2O→H2SO4+OH−(12)

Amphoteric oxides exhibit both basic as well as acidic properties. When they react with an acid, they produce salt and water, showing basic properties. While reacting with alkalies they form salt and water showing acidic properties.

For example ZnO exhibits basic behavior with HCl

ZnO+2HCl→ZnCl2zincchloride+H2O(basicnature)(13)

and acidic behavior with NaOH

ZnO+2NaOH→Na2ZnO2sodiumzincate+H2O(acidicnature)(14)

Similarly, Al2O3 exhibits basic behavior with H2SO4

Al2O3+3H2SO4→Al2(SO4)3+3H2O(basicnature)(15)

and acidic behavior with NaOH

Al2O3+2NaOH→2NaAlO2+H2O(acidicnature)(16)

Neutral Oxides

Neutral oxides show neither basic nor acidic properties and hence do not form salts when reacted with acids or bases, e.g., carbon monoxide (CO); nitrous oxide (N2O); nitric oxide (NO), etc., are neutral oxides.

Peroxides and Dioxides

Oxides: Group 1 metals react rapidly with oxygen to produce several different ionic oxides, usually in the form of M2O. With the oyxgen exhibiting an oxidation number of -2.

4Li+O2→2Li2O(17)

Peroxides: OFTEN Lithium and Sodium reacts with EXCESS oxygen to produce the peroxide, M2O2. with the oxidation number of the oxygen equal to -1.

H2+O2→H2O2(18)

Superoxides: Often Potassium, Rubidium, and Cesium react with excess oxygen to produce the superoxide, MO2. with the oxidation number of the oxygen equal to -1/2.

Cs+O2→CsO2(19)

A peroxide is a metallic oxide which gives hydrogen peroxide by the action of dilute acids. They contain more oxygen than the corresponding basic oxide, e.g., sodium, calcium and barium peroxides.

BaO2+H2SO4→BaSO4+H2O2(20)

Na2O2+H2SO4→Na2SO4+H2O2(21)

Dioxides like PbO2 and MnO2 also contain higher percentage of oxygen like peroxides and have similar molecular formulae. These oxides, however, do not give hydrogen peroxide by action with dilute acids. Dioxides on reaction with concentrated HCl yield Cl2 and on reacting with concentrated H2SO4 yield O2.

PbO2+4HCl→PbCl2+Cl2+2H2O(22)

Answer:

GOLD ,  STAINLESS STEEL and BRASS

Explanation:

Gold - for ornaments ........  ( made up of = Gold 91.67% Silver 5% COPPER 2% Zinc 1.33% )

Stainless Steel - for utensils such as plates / forks / SPOONS .......... ( made up of = 18% CHROMIUM and 8%/10% nickel )

Brass - for making decorative things ( made up of = 67% copper and 33% zinc )

Answer:

CHEMICAL reactions proceed at different rates. The factors that affect reaction rates are:

surface AREA of a solid reactant

concentration or pressure of a reactant

temperature

nature of the reactants

presence/absence of a catalyst.

A change in ONE or more of these factors may alter the rate of a reaction. In this LESSON, you will DEFINE these factors, and describe and predict their effects on reaction rates.

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Answer:

MgSO4. 7H2O

MM=24.31+32.06+4(16)+7(18.02)

=246.51g/mol

PERCENT H2O. = 7(18.02g/mol) ENTO 100

246.51g/mol

= 51.17 Percent H2o

Answer:

because their MOLECUELS are loosely packed HENCE CREATING more SPACE

Answer:

H -means 1 atoms of HYDROGEN .

2H -means 1 MOLECULE or 2 atoms of hydrogen .

H2 -means 2 molecule of hydrogen .

Answer:

EXPLANATION:yes we can convert METALS into WIRE UNLESS it is BRITTLE

ANSWER:

Explanation:

An inflated BALLOON contains the GAS filled in it.

Usually helium is filled in it.

Benzoic ACID in the FORM of its sodium salt, CONSTITUTES one of the most common CHEMICAL food PRESERVATIVE. Sodium benzoate is a common preservative in acid or acidified foods such as fruit juices, syrups, jams andjellies, sauerkraut, pickles, preserves, fruit cocktails, etc.

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A modified version of the traditional wave VECTOR computational scheme for the dynamic

analysis of long undamped periodic structures is presented. First, the consistency of the

complex wave vector mathematical formulation is DISCUSSED, placing particular emphasis on

the real or complex NATURE of the resulting characteristic equation from which the natural

frequencies are derived. It is shown that the rearrangement in terms of complex waves

entering the domain, devised to overcome ill-conditioning arising in the transfer matrix …

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Answer:

A molecular VIBRATION OCCURS when atoms in AMOLECULE are in periodic motion while themolecule as a WHOLE has constant translational and rotational motion. ... A fundamental vibrationis excited when one such quantum of energy is absorbed by the molecule in its ground state.

Answer:

When dilute hydrochloric acid reacts with sodium hydrogen carbonate, Carbon dioxide gas is LIBERATED .We recognize the presence of carbon dioxide by PASSING it through lime water which turns MILKY or a WHITE precipitate of calcium carbonate is formed. This confirms that the gas is carbon dioxide.

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Answer:

Acidic KMNO4 is a very strong oxidizing agent. Plus its way more economical too. The number of electrons transfered is 5 in acidic medium PER mole of Kmno4 this makes it EASIER to use small quanities and get away with good results. ... Do we use alkaline kmno4 or acidic kmno4 for OXIDATION of alcohols to acids?

Explanation:

Calorimetry is the science or act of measuring changes in state variables of a body for the purpose of deriving the heat transfer associated with changes of its state due, for example, to chemical reactions, physical changes, or phase transitions under specified constraints. Calorimetry is performed with a calorimeter. The word calorimetry is derived from the Latin word calor, meaning heat and the GREEK word μέτρον (metron), meaning measure. Scottish physician and scientist Joseph BLACK, who was the first to recognize the distinction between heat and temperature, is said to be the founder of the science of calorimetry.

Indirect calorimetry calculates heat that living organisms produce by measuring either their production of carbon dioxide and nitrogen waste (frequently AMMONIA in aquatic organisms, or urea in terrestrial ones), or from their consumption of oxygen. Lavoisier noted in 1780 that heat production can be predicted from oxygen consumption this way, using multiple regression. The dynamic energy budget theory explains why this procedure is correct. Heat generated by living organisms may also be measured by direct calorimetry, in which the entire organism is placed inside the calorimeter for the measurement.

A widely used MODERN instrument is the differential scanning calorimeter, a device which allows thermal data to be obtained on small amounts of material. It involves heating the SAMPLE at a controlled rate and recording the heat flow either into or from the specimen.

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Answer:

salt , WATER , NITROGEN and force of attraction

ANSWER:

Conversion of ICE to WATER is called FUSION or melting

Melting and fusion both are CORRECT

Answer:

5 WATER MOLECULES are present in one FORMULA unit of COPPER sulphate

Explanation:

CuSO4.5H20 Crystallisation is the process used

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TRIVALENT ELECTROPOSITIVE IONS

it is RED in BASIC SOLUTION is the RIGHT ANSWER

Explanation:

Using UV-absorption spectra to find CONCENTRATIONS. You should remember the Beer-Lambert Law: The expression on the LEFT of the EQUATION is known as the absorbance of the SOLUTION and is measured by a spectrometer. A=ϵlc. The SYMBOL epsilon is the molar absorptivity of the solution.

ANSWER:

Explanation:

r: METHOXY GROUP is an electron RELEASING group which stabilises the intermediate carbocation. ... Formation of carbocation is the rate DETERMINING step, more the stability of carbocation, faster is the reaction. Hence, p-methoxybenzyl bromide reacts faster than p-nitrobenzyl bromide with ethanol to form ether.

Answer:

Explanation:

Amino acids are very small biomolecules with an average molecular weight of about 135 daltons. ... SUBSTITUENTS on the alpha (or saturated) carbon ATOM VARY from lower alkyl GROUPS to ... beta-Alanine - The only naturally occurring beta amino acid. ... Cysteine - Thiol containing amino acid involved in ACTIVE sites and protein ...

Answer:

Explanation:

All potassium-oxygen BINARY compounds are known to react with WATER VIOLENTLY, FORMING potassium hydroxide.

Answer:

19.8×10^-19

Explanation:

E=hn

where, n=frequency

E=6.6×10^-34×3×10^15=19.8×10^-19

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ANSWER:

44.874% MASS

PLEASE MARK it as the BRAINLIEST answer

Answer:

2.76ev

Explanation:

E = Energy (joules) 

H = PLANCK's constant (6.626 *10^-34 J/s) 

c = the speed of light (2.997 *10^8 m/s) 

lambda = the wavelength of light (convert to meters) 

Of course if you want the answer in electron volts (eV) you have to convert it later. 

So, E = (6.626*10^-34 x 2.997*10^8)/450*10^-9

= 4.413*10^-19 Joules 

1 eV = 1.6*10^-19 Joules 

THEREFORE the energy of a PHOTON with a wavelength of 450 NM 

= 2.76 eV

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Answer:

Element Symbol Mass Percent

Copper Cu 25.450%

HYDROGEN H 4.037%

OXYGEN O 57.671%

Sulfur S 12.842%

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Explanation:

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Answer:

The TERMS anode and CATHODE are based on the direction of FLOW of electrons. Free electron ALWAYS travel through the external circuit from anode to cathode. ... Electrons are negatively charged, and so are attracted to the POSITIVE end of a battery and repelled by the negative end.

N2+3H2---------> 2NH3 it will HELP you

EXPLANATION:

LIME WATER is a CHEMICAL COMPUND

EXPLANATION:

Using UV-absorption spectra to FIND CONCENTRATIONS. You should remember the Beer-Lambert Law: The expression on the left of the equation is known as the absorbance of the solution and is measured by a spectrometer. A=ϵlc. The symbol EPSILON is the MOLAR absorptivity of the solution.

Answer:

Explanation:

REVERSE OSMOSIS (R.O.) Reverse Osmosis removes TDS by forcing the water, under pressure, through a SYNTHETIC membrane. ...

Distillation. The process involves boiling water to produce water vapor. ...

Deionisation (DI)

Answer:

Explanation:

Structure of MAGNETITE iron oxide, (Fe3O4), where the red ATOMS are oxygen, teal atoms are tetrahedral iron, and BLUE are octahedral iron[2]. Nanoparticles (NPs) have recently been found to have a use as magnetic resonance (MR) CONTRAST agents[3].

Answer:

EXPLANATION:

Determination of whether something is a living organism or a nonliving OBJECT is based on ______. A. a single ... several characteristics such as DNA and other organic materials inside a CELL ... B. new individuals that are always genetically identical to the parents .... polymers serve as the genetic MEMORY in living cells.

Answer:

SEA water CONTAINS SALT and other minerals so it BOIL above 100 Celsius

•Copper OXIDE : -cuO

•Zinc Hydoxide : - zn(OH)2

•Potassium carbonate : - K2CO3

•Calicium chloride :- CaCl2

•Magnesium nitrate :- MG(NO3)2

•Sodium sulphate :- Na2SO4

•Ammonium HYDROXIDE :- NH4OH

•Iron Sulphate :- FeSO4

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Hola mate here is your answer :-

Barium has 2 e-s in its outer shell., with ATOMIC no. of 56. ... Hence the valence of Ba is 2 forming the highly REACTIVE Ba2+…. Ba being highly reactive is never FOUND in free stae in nature.

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A functional group is DEFINED as an atom or group of atoms in a molecule that gives the molecule its characteristic chemical and PHYSICAL properties. For EXAMPLE the OH group is a functional group and the organic compounds containing the OH group are called alcohols. The compounds containing this group show similar chemical properties (provided they do not CONTAIN any other functional group). Other functional groups include the carboxyl group (-COOH group), the aldehydic group (-CHO group), the keto group (C=O group), halogen atom (X, where X = F, Cl, Br, I ) etc.

Answer:

the TEMPERATURE of the ICE will rise and stop at a temp for some TIME

Explanation:

ONLY isomers that are non-superimposable mirror images are enantiomers of each other. Diastereoisomers are, essentially, different compounds. They have different physical PROPERTIES (solubility, m.p., b.p., NMR, IR spectra etc.) and can be SEPARATED by physical methods such as fractional DISTILLATION.