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Answer:

Metal oxides are a chemical compound FORMED between metals, specifically cations such as Na, K, LI, etc., and oxygen. ... These formations tend to be solid, basic and are more dense than their nonmetallic oxide counterparts. Metal oxides typically contain an ANION of oxygen in the OXIDATION state of −2.

Under standard conditions ONE mole of any SUBSTANCE occupy 22.4dm3 or 1 LITER VOLUME.
So there will be only one mole of oxygen in 1 liter volume at STP

Answer:

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Explanation:

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Glass is a AMORPHOUS solid so all amorphous solid have a tendency to flow, though very SLOWLY. Hence, glass is considered as a super COOLED liquid. That is why the glass windows and doors become slightly thicker at the bottom than at the TOP with the time.

SODIUM OXIDE is SOLUBLE in WATER

Explanation:

Which one of the hydracid does not FORM any precipitate with AgNO. SOLUTION : HF gives no precipitate SINCE AgF is FORMED which is soluble in water

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Answer:

COPPER can be extracted from its ore by HEATING it with carbon. Impure copper is purified by ELECTROLYSIS in which the anode is impure copper, the cathode is pure copper and the electrolyte is copper sulphate solution. An alloy is a MIXTURE of two elements, ONE of which is a metal

ANSWER:

DECOMPOSITION REACTION is the answer

ANSWER:

Density CHANGES with temperature because volume changes with temperature.

Density is mass DIVIDED by volume.

Density = mass / volume

As you HEAT something up, the volume usually increases because the faster moving molecules are further apart. SINCE volume is in the denominator, increasing the volume decreases the density

hence density decrease with increasing temperature

ANSWER:

Anoxygenic PHOTOSYNTHESIS is used mainly by the PURPLE bacteria, the GREEN sulfur and ... like algae and in bacteria such as cyanobacteria; the same mechanism is at WORK in both

Answer:

METALLIC oxides are ALWAYS basic in NATURE

ANSWER:

(2) DECREASE in 50 ML

_______________

EXPLANATION:

change of LIQUID into solid in very low temperature 0 DEGREE CELCIUS

Answer:

MELTING:

It is PHYSICAL change results in the phase transition of a substance from a SOLID to a liquid.

HEY mate....

Here's your answer....

In CHEMISTRY, sigma BONDS are the STRONGEST type of covalent chemical bond. They are formed by head-on overlapping between atomic orbitals. Sigma bonding is most simply defined for diatomic molecules using the language and tools of symmetry groups

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Answer:

It is prepared by reaction of COLD and concentrated solution of SODIUM chloride with ammonia and carbon dioxide . and the FORMULA is =NaHCO3...

Answer:

A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in SOLID form are represented by (s) after their chemical formulas.

a) 2NaOH(aq)+(NH_4)_2SO_4(aq)\RIGHTARROW 2NH_4OH(aq)+Na_2SO_4(aq)2NaOH(aq)+(NH

4

)

2

SO

4

(aq)→2NH

4

OH(aq)+Na

2

SO

4

(aq)

b) (Nb)2(SO_4)_5(aq)+Ba(NO_3)_2(aq)\rightarrow Nb(NO_3)_2(aq)+BaSO_4(s)(Nb)2(SO

4

)

5

(aq)+Ba(NO

3

)

2

(aq)→Nb(NO

3

)

2

(aq)+BaSO

4

(s)

c) SR(Br)_2(aq)+2AgNO_3(aq)\rightarrow Sr(NO_3)_2(aq)+2AgBr(s)Sr(Br)

2

(aq)+2AgNO

3

(aq)→Sr(NO

3

)

2

(aq)+2AgBr(s)

d) Ba(OH)_2+H_2SO_4\rightarrow BaSO_4+2H_2OBa(OH)

2

+H

2

SO

4

→BaSO

4

+2H

2

O

e) Na_3PO4+3KOH\rightarrow 3NaOH+K_3PO_4Na

3

PO4+3KOH→3NaOH+K

3

PO

4

f) BaCl_2+Al_2(SO_4)_3\rightarrow 2AlCl_3+3BaSO_4BaCl

2

+AL

2

(SO

4

)

3

→2AlCl

3

+3BaSO

4

g) Pb(NO_3)_2+H_2SO_4\rightarrow PbSO_4+HNO_3Pb(NO

3

)

2

+H

2

SO

4

→PbSO

4

+HNO

3

h) BaSO_4(aq)+NACL(aq)\rightarrow Na_2SO_4(aq)+BaCl_2(s)BaSO

4

(aq)+NaCl(aq)→Na

2

SO

4

(aq)+BaCl

2

(s)

i) HCN+LiOH\rightarrow LiCN+H_2OHCN+LiOH→LiCN+H

2

O

j)

Explanation:

The color of FERROUS sulphate crystals is green. Ferrous sulphate crystals contain water molecules (FESO4. ... So their colour changes from LIGHT green to white. On further heating, anhydrous ferrous sulphate decomposes to form ferric oxide (Fe2O3), SULPHUR dioxide (SO2) and sulphur trioxide (SO3).

ANSWER: COPPER oxide

Explanation:

Answer:

Crystallization is the solidification of atoms or molecules into a HIGHLY structured form called a crystal. ...Crystallization can also refer to the solid-liquid SEPARATION and purification technique in which MASS transfer occurs from the liquid solution to a pure solid crystalline phase.

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Answer:

EXPLANATION:

a) As temperature decreases distance between particles decreases, increase in pressure also decrease the distance between particles. b) As separation between particle decreases force of attraction increase. c) GAS CHANGES to LIQUID state, if temperature goes on decreases and pressure increases

ANSWER: temperature

Explanation:

ANSWER:

Explanation:

it used as a REFRIGERANT, especially during shipping of perishable products such as meats or ICE CREAM.

A SMALL quantity of dry ice will increase the growth rate of plants.

A FRESHLY mopped floor dries quickly because the rate of evaporation increases with INCREASE in wind SPEED. So the water get evaporated FASTER.

QUESTION:

EXPLAIN the following chemical properties of acid with the help of balanced chemical equations

When an acid react with a metal carbonate .

Answer:

◆ When acid react with a metal carbonate it give salt, carbon dioxide and WATER.

◆ Acid + Metal Carbonate ---- Salt + Carbon dioxide + Water.

◆ Example: 2HCl Na2CO3 --- 2NaCl + CO2 + H2O

◆ CO2 can be checking by the passing in lime water.

◆ It turns lime water milkly.

◆ EXAMPLE: Ca(OH)2 + CO2 --- CaCO3 + H2O.

◆ When excess CO2 is passed, milkiness disappear

◆ Example: CaCO3 + CO2 + H2O ---- Ca( HCO)3

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yes it is an EFFECTIVE way for REDUCING the CONSUMPTION of PETROL

The similarity among the three states of matter is - They are MADE up of small tiny particles. They have a particular MASS and can OCCUPY space . This three states have volume in it . The atoms of this three states have force of attractions between them .

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PLZZ POST your COMPLETE QUESTION.......

The oxidation state of Mn in KMnO4 is +7. This can be OBTAINED by taking into account the valencies of potassium and oxygen ATOMS. The valency of K is 1 but it LOSES electron so to be specific it is +1. SIMILARLY oxygen in specific has a valency of -2.

• HEY MATE !!! •

The position of an object is DESCRIBED by a reference point .

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DON'T FORGET TO FOLLOW !

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Answer:

In a PEROXIDE ion (O2), each oxygen atom has a -1 oxidation number which combine to give peroxide its -2 CHARGE. The oxidation number of oxygen in COMPOUNDS is usually -2, but it is -1 in peroxides. The sum of the oxidation numbers of all the atoms in a NEUTRAL COMPOUND is 0. The oxidation number of H is +1 (Rule 1).

ANSWER:

Oxygen (O) has eight valence ELECTRONS. The left oxygen in O-N=O has 8 – 2 = 6 unshared electrons. The right oxygen has 8 - 2(2) = 8 – 4 = 4 unshared electrons. NITROGEN also has eight total valence electrons

The nitrogen atom does indeed have two unshared electrons, which MAKE up 1 unshared PAIR.

ANSWER:

the answer is SEVENTY EIGHT

ANSWER:

HYDROGEN GENERATION from Formic Acid. DECOMPOSITION with a RUTHENIUM Catalyst Promoted by Functionalized Ionic Liquids

Answer:

When a COPPER is HEATED in PRESENCE of oxygen a black compound ... copper oxide is formed.

2Cu+O2 ∆-> 2CuO

Answer:

electrochemical cell is a DEVICE which convert CHEMICAL energy into electrical energy .on the other HAND ELECTROLYTIC cell is a device which convert electrical energy into chemical energy. for EXAMPLE in electrochemical cell anode is negative whereas the electrolytic cell anode is positive

Answer:

Hey mate..!

Here's your answer.....

The heat REQUIRED to convert a SOLID into a liquid or VAPOUR, or a liquid into a vapour, without change of temperature.......

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ANSWER:

40% is the correct answer.

EXPLANATION:

The solubility of KCL = 40 gram

density of solution = 1.4 gram /LITRES

To find :

w/v percentage of KCL is the solution​

Solution:

We know that, to calculate density

Den = mass / volume

Mass = 100+40 = 140

V is volume

density=(40+100)/v = 1.4

140=1.4v

v=140/1.4

v= 100

We know that

w/v%=mass of KCl in 100 ml of solution.

140/1.4 ml contains 40 g of KCl.

100 ml will contain (100 x 40X 1.4/140 )=

=40%

Hence,

40% is the correct answer.

Answer:

3.71*10power-23L

Explanation:

molecular mass of NITROGEN =28u.

28u nitrogen GAS=1molecules of N

1mole of nitrogen gas at STP occupies=22.4L

that means6.023*10power23molecules of N occupies=22.4L

hence,28u occupies=22.4/6.023*10power23

=3.71*10power-23

Answer:

When a solution of potassium IODIDE is added into a LEAD nitrate solution, potassium nitrate and a bright yellow PRECIPITATE of lead iodide are produced. ... When a solution of potassium iodide is added to a solution of lead nitrate taken in a TEST TUBE .

Answer:

A common DRY cell is the zinc-carbon cell, sometimes CALLED the dry Leclanché cell, with a NOMINAL voltage of 1.5 VOLTS, the same as the ALKALINE cell (since both use the same zinc–manganese dioxide combination).

STANDARD electrode potentials are a measurement of EQUILIBRIUM potentials. The position of this equilibrium can change if you change some of the conditions (e.g. CONCENTRATION, temperature). It is therefore important that standard conditions be used:

pressure = 101,3 kPa (1 ATM)

temperature = 298 K (25 ℃)

concentration = 1 mol.dm−3

Answer:

physical PROPERTY can be CHANGED by heating or COOLING

Explanation:

for EXAMPLE:

ICE

it can be changed to water by heating and water can again be changed into ice by cooling it.

Answer:

(NH_4)_2Cr_2O_7 ---------gt N_2 + Cr_2O_3 + 4H_2O

According to above equation, 1 mol of ammonium dichromate would give 4 mols of H_2O . When heated these H_2O will be evaporated away.

The molar mass of ammonium dichromate

= 2 XX(14+4)+ 2xx52 + 7 xx 16

= 252 g per mol

The number of mols of ammonium dichromate heated

= 63 g / 252 g per mol

= 0.25 mol.

Therefore number of mols of water evaporated = 4 xx 0.25 mol

= 1 mol.

The mass of water evaporated = 1 mol xx 18 g per mol

= 18 g.

Therefore 18 grams of water is evaporated.

Also produced N_2 also are released to atmosphere.

Number of N_2 mols produced = 1 xx 0.25 mol

= 0.25 mol

Mass of N_2 released = (14+14) xx 0.25 g

= 7 g.

Therefore TOTAL mass loss = 18 + 7

= 25 g.

Answer:

the NUMBER of orbital in p subshell is 3 and the number of orbital in d subshell is 5

we know:.

L m(-l to l)

1=p -1,0, 1 =total 3 ORBITALS

2=d -2,-1,0,1,2 = total 5 orbitals

It controls hunger and THIRST and some of the most basic body functions, such as body temperature, BLOOD pressure, and BREATHING. The brain is protected by the bones of the skull and by a COVERING of three thin membranes called meninges. ... These bones PROTECT the spinal cord.

It is a SCHOOL and is in SOLID FORM

Question:

What is observed when a solution of potassium iodide is added to a solution of lead acetate in a test tube.

1. What type of reaction is this.

2. Write a balanced CHEMICAL equation to represent the above equation?

Answer:

◆ When a solution of potassium iodide is added to a solution of lead nitrate taken in a test tube, the precipitation of a yellowish solid is observed. This yellowish solid is lead iodide. Potassium nitrate is formed ALONG with lead iodide.

◆ This is a double displacement reaction.

◆ When the two ionic compounds / elements exchange their ions is called Double Displacement Reaction.

◆ The balanced chemical equation for the above reaction is:

Balanced Equation: Pb(NO3)2 + 2KI --- 2KNO3 + PbI2

Word Equation: lead nitrate + Potassium Iodide ---- Potassium Nitrate + Lead Iodide.

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ANSWER:Facebook

Explanation:it is the very GOOD APP .