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Because pure SUBSTANCES are BUILT by single element whereas MIXTURE is MADE of TWO or more elements

Answer:

1) CARBON, hydrogen, oxygen

2) calcium oxide

Explanation:

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A-in first CASE it is decomposition reaction and in the other case is combination reaction
B-the METAL is CuO
1- 2Cu+O2---->2CuO
2- CuO + H2---> Cu + H2O

Nitric acid takes YELLOWISH brown colour due to presence of dissolvednitrogen dioxide the colour of nitric acid changes due to release of oxides of NITROGEN especially nitrogen dioxide into the AIR upon exposure to light

The CORRECT answer should be sp3 and sp3d2 because the PHOSPHOROUS in PCl5 EXISTS in both (PCl4)+ and (PCl6)- to INCREASE interionic bond attraction.....

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S      +   O2   → SO2
1mol    1mol        1mol

​Moles of S reacted = 16g/32G/MOL = 0.5 mol
0.5 mol of S needs 0.5 mol of Oxygen,

{To complicate the question x CC is mentioned in the question, which has no SIGNIFICANT use.}
So we know that Sulphur burns in 0.5 mol Oxygen.

The thermal decomposition of Potassium nitrate :
2KNO3  →  2KNO2 + O2
2mol                             1 mol

​[2 x 101g]                    32g O2


1 mol of O2 is produced by 2 mol of KNO3
​0.5 mol will thus be produced by 1 mol of KNO3

Thus 1mol of KNO3 is required to produce the given amount of Oxygen.
1mol of KNO3 = molar mass of KNO3 = 101g
Hence 101g of KNO3 is required.

Because DISTILLATION MAKES water vapour and LEAVES the IMPURITIES behind and in filtration some impurities come with water

Here's your ANSWER. HOPE it HELPS

That is IODINE it BURNS with VIOLET VAPOURS.

AMMONIUM chloride is a sublime SUBSTANCE and HENCE can be separated through sublimation whereas other substances in the mixture will REMAIN there only(if not sublime substance)

HOPE IT HELPS YOU

It is so because little bit PARTICLES of chalk gets diffused into the BLACKBOARD and HENCE are difficult to remove.
You can EVEN try it.

HOPE IT HELPS U☺☺☺

Hey dear,

● Answer -
0.625 moles of CO
1.875 moles of CO2

● EXPLANATION -
# Given-
Vapor density = 20

# Solution-
Molar WEIGHT of mixture = 2 × vapor density = 2 × 20 = 40

Let
x = mole fraction of CO
1-x = mole fraction of CO2

Therefore,
28(x) + 44(1-x) = 40
28x + 44 - 44x = 40
16x = 4
x = 0.25

No of moles of CO will be -
n1 = 0.25 × 100 / 40
n1 = 0.625 moles

No of moles of CO2 will be -
n2 = (1-0.25) × 100 / 40
n2 = 1.875 moles

Therefore, 100 g of mixture contains 0.625 moles of CO and 1.875 moles of CO2.

Hope this helps...

hey...

INDUCTIVE EFFECT is a electronic effect DUE to the polarizing of an BOND

hey...

Washing soda is SODIUM carbonate.​Sodium carbonate reacts with sulphuric acid to FORM sodium sulphate, water and carbon DIOXIDE.

:)

hey..

if that substance is reversable or the substance in the BEGGINING is BROUGHT back again by COOLING then it is PHYSICAL change or else if u are not GETTING or it is irreversable then it is a chemical change

:)

hey..

the Sun can BURN hydrogen to helium without the need for oxygen. It should be in the presence of CARBON, nitrogen and oxygen, stars heavier than the Sun may burn hydrogen to helium by USING the C, N and O as catalysts. Even in these stars, however, an ABSENCE of oxygen does not prevent nuclear burning.

HEY..

Na2CO3 + HCl ----> NaHCO3 +NACL

As more HCl is added the sodium BICARBONATE reacts with it to PRODUCE CO2, NaCl and H2O;-

NaHCO3 + HCl ----> NaCl + CO2 + H2O

:)

hey..

we can OBSERVE

-change in colour

-change in state

-evolution of a gas

-change in TEMPERATURE

hey...

The reddish brown layer on iron is rust. It is OBTAINED due to RUSTING of that metal.When an iron metal is attacked by SUBSTANCES AROUND it such as moisture,acids etc.. it is said to be corroded or rusted. That is why we find iron articles coated with that layer.

:)

METAL carbonate/metal HYDROGEN carbonate+acid GIVES salt+co2+water

CaCO3 +heat--->CaO +Co2
X gms               1.68gms
100                   56
[molecular mass of CaCO3=100u
molecular mass of CaO=56u]
cross multiply through the equation and solve for x grams of caco3
x=1.62x100/56
=2.89g
Cacl2 +Na2Co3 --->Caco3 +2 Nacl
x                             2.89g
111                         100
Again cross multiply through the equation and solve for x grams of Cacl2
x=2.89x 111/100
=3.2g
%CaCl2 in original MIXTURE 3.2grams 
Cacl2 over 10gms mixture is 32%

Hey Troll1478,

Zinc is more REACTIVE than hydrogen and it displaces hydrogen from DILUTE acids. Zinc reacts with dilute sulphuric acid to form zinc sulphate and hydrogen GAS is evolved. This is a single displacement REACTION of a non-metal by a metal.

hope dis helps u!

With REGARDS,

It's ENDOTHERMIC REACTION.

When a solution doesn't have solute dissolved, is said to be saturated.

is the solubility of the solute is in the SOLVENT and DIRECTLY proportional to TEMPERATURE then increasing the temperature of the system will make it unsaturated

Hey mate here is your answer☺️☺️


A METHOD for the determination of methoxyl and ethoxyl groups in organic compounds, in which the substance is heated with hydriodic acid; the iodoalkane THUS formed is PASSED into an ethanolic solution of SILVER I NITRATE, and the resulting silver I iodide weighed.

Hope it helps you:D

Specific Heat and Latent Heat

Specific heat: = energy required to change a unit mass of a material by 1°C. Units: energy per unit mass per degree.

Latent heat = energy required to change the state (gas, liquid, solid) of a unit mass of material. Units: energy per unit mass.

Both specific heat and latent heat are properties of a given material. In other words, every time the material is heated/cooled, no matter how quickly or by what heating process, the same amount of heat is transferred to reach the same state.

Change in energy of a substance:

To raise/lower its temperature:
DE = CpM DT

To change its state:
DE = LM

where 
DE = change in energy
DT = temperature change
M = mass
Cp = specific heat
L = latent heat

Energy must be added

to increase the temperature

to melt it 

to evaporate it

Energy is released when a substance

cools

condenses

freezes

Energy units:

Ergs (1 ERG = 1 g cm2 s-2)

JOULES (1 J = 1 kg m2 s-2 = 107 ergs)

Calories (1 cal = 4.184 J)

Total energy to raise temperature of 1.0 kg of water from 10°C to 110°C

Cpwater = 4.2 x 103 J kg-1 °C-1
Cpsteam = 2.0 x 103 J kg-1 °C-1
Lvaporization = 2.3 x 106 J kg-1
M = 1 kg

DE = energy to heat water to boiling point + 
energy to change state + 
energy to raise temperature of steam
= Cpwater MDT + LvaporizationM + CpsteamMDT
= (4.2 x 103 J kg-1 °C-1)(1 kg)(90°C) + (2.3 x 106 J kg-1)(1 kg) + (2.0 x 103 J kg-1 °C-1)(1 kg)(10°C)

= 2.7 x 106 J

Total energy released at midocean ridges by formation of new oceanic crust


Cpbasalt = 1.4 x 103 J kg-1 °C-1
Cpmagma = 1.0 x 103 J kg-1 °C-1
Lmelting = 4.0 x 105 J kg-1
Temperature of magma when erupted = 1300°C
MELTING point 1200°C
Temperature of sea water = 0°C
Length of ridge = 60,000 km = 6 x 107 m
Crustal THICKNESS = 5 km = 5 x 103 m
Average SPREADING rate 2 cm yr-1 = 2 x 10-2 m yr-1
Density of basalt 3 x 103 kg m-3

1. Mass of magma solidified (per year) = volume x density
= ridge length x crustal thickness * spreading rate* density
= (6 x 107 m)( 5 x 103 m)( 2 x 10-2 m yr-1)( 3 x 103 kg m-3)
=2 x 1013 kg yr-1

2. DE = energy to solidify and cool crust (per year)
= energy to cool magma to melting point +
energy to solidify magma + 
energy to cool basalt to ocean water temperature

DE = Cpmagma MDT +
LmeltingM +
CpbasaltMDT
= (1.0 x 103 J kg-1 °C-1)(2 x 1013 kg)(100°C) +
(4.0 x 105 J kg-1)(2 x 1013 kg) +
(1.4 x 103 J kg-1 °C-1)(2 x 1013 kg)(1200°C)
= 2 x 1018 J + 8 x 1018 J + 3 x 1019 J

= (4 x 1019 J)(107ergs/ J)= 4 x 1026 ergs

In the stars there is REACTION of hydrogen and helium which produces a lot of LIGHT ENERGY so it twinklea

Because when it is kept OUTSIDE it REACTS with OXYGEN and forms an layer of oxide which prevents BURNING.

That is of 2 types of adsorption in this case :-

1)physisorption: gas is BOUNDED by van der wal's force.

2) CHEMISORPTION: gas is bounded chemically

Now if it's spontaneous Gibbs energy will be negative if not positive.

And remember by adsorption the SYSTEM gets ordered so you can expect a negative impact on entropy.

Now, the Thermodynamic change from more entropy to LESS entropy in terms of magnitude should release energy from the system, so, it can be exothermic, though it depends on the specific EXAMPLE you are thinking.
I think it's helpful for u

Aqua Regia is the SOLUTION is USED to DISSOLVE GOLD

The products of acid/metal reactions are a salt and HYDROGEN GAS. Some METALS are so unreactive that they do not react with DILUTE acids at all, e.g. COPPER, silver and gold.

PVC - USED for MAKING SANITARY PIPES

Because zinc has higher MELTING POINT than TIN, zinc is more REACTIVE than tin which may react with food items and make it unfit for health ....and also zinc is costlier than tin...

........hope this may help you......

Explanation:

Melting POINT is defined as the temperature at which SOLID starts to convert into LIQUID state.

It is known that copper, silver and gold all are transition METALS. Their melting points are listed as follows.

Copper - or

Gold - or

Silver - or

Hence, we can conclude that melting points of given elements from increasing to decreasing order are as follows.

                                CU > Au > Ag

(2) CU has the MAXIMUM STANDARD oxidation POTENTIAL

Organic COMPOUND


In chemistry, an organic compound is generally any chemical compound that contains carbon. Due to carbon's ability to CATENATE, millions of organic compounds are known as Organic compound.


Inorganic compounds


An inorganic compound is typically a chemical compound that lacks C-H bonds, that is, a compound that is not an organic compound, but the distinction is not DEFINED or EVEN of particular interest.

Smoke and fog both are aerosols. In what way are they different? Smoke –Smoke is mixture of gases and can GOES to HIGHER altitudes because of having more temperature. ... Fog is settled NEAR the earth SURFACE because of less temperature