Pure substances

Pure substances
by

1 Answer

Answer :

Any material that is not a mixture, is called a pure substance. Pure substances include elements and compounds. It is much more difficult to break down pure substances into their parts, and complex chemical methods are needed to do this.
by

Related questions

Names and formulae of substances

Description : Names and formulae of substances

Last Answer : Think about what you call your friends. Some of your friends might have full names (long names) and a nickname (short name). These are the words we use to tell others who or what we are ... that was used earlier, the compound name is a combination of the names of the elements but slightly changed.

In a pure resistive circuit, the average power Pavg is _________ the peak power Pmax.

Description : In a pure resistive circuit, the average power Pavg is ______ the peak power Pmax. (1) Double (2) One-half of (3) One-fourth (4) Equal to

Last Answer : In a pure resistive circuit, the average power Pavg is One-half of the peak power Pmax.

In a pure capacitive circuit if the supply frequency is reduced to 1/2, the current will?

Description : In a pure capacitive circuit if the supply frequency is reduced to 1/2, the current will?

Last Answer : In a pure capacitive circuit if the supply frequency is reduced to 1/2, the current will be reduced by half.

In a pure inductive circuit if the supply frequency is reduced to 1/2, the current will?

Description : In a pure inductive circuit if the supply frequency is reduced to 1/2, the current will?

Last Answer : In a pure inductive circuit if the supply frequency is reduced to 1/2, the current will be doubled.

An A.C. voltage is impressed across a pure resistance of 3.5 ohms in parallel...

Description : An A.C. voltage is impressed across a pure resistance of 3.5 ohms in parallel with a pure inductance of impedance of 3.5 ohms?

Last Answer : An A.C. voltage is impressed across a pure resistance of 3.5 ohms in parallel with a pure inductance of impedance of 3.5 ohms, both resistance and inductance carry equal currents.

The r.m.s. value of pure cosine function is?

Description : The r.m.s. value of pure cosine function is?

Last Answer : 0.707 of peak value

Pure inductive circuit takes power from the A.C. line when?

Description : Pure inductive circuit takes power from the A.C. line when?

Last Answer : It takes power when voltage decreases and current increases.

In a pure inductive circuit?

Description : In a pure inductive circuit?

Last Answer : Voltage lagging in inductor

In a pure resistive circuit?

Description : In a pure resistive circuit?

Last Answer : In a pure resistive circuit current is in phase with the voltage.

Pure inductive circuit?

Description : Pure inductive circuit?

Last Answer : Pure inductive circuit takes power from the line during some part of the cycle and then returns back to it during other part of the cycle.

is tap water in a glass pure substances or mixture?

Description : is tap water in a glass pure substances or mixture?

Last Answer : Are a mixture because is water is a compound of hydrogen and oxygen

Is **** pure substances?

Description : Is wine pure substances?

Last Answer : No, wine is not a 'pure' substance. White, rosé and red wines are produced by the fermentation of the several varieties of grapes. Therefore, due to additives and other processes, all wines are not a pure substance.

What is two or more substances that are together but do not combine to form a new pure substance?

Description : What is two or more substances that are together but do not combine to form a new pure substance?

Last Answer : What is the answer ?

Is caustic soda flakes are a pure substances or mixture?

Description : Is caustic soda flakes are a pure substances or mixture?

Last Answer : What is the answer ?

Activated Charcoal is used to remove colouring matter from pure substances by – (1) Bleaching (2) Oxidation (3) Adsorption (4) Reduction

Description : Activated Charcoal is used to remove colouring matter from pure substances by – (1) Bleaching (2) Oxidation (3) Adsorption (4) Reduction

Last Answer : (3) Adsorption Explanation: Heating wood to a very high temperature in the absence of air makes charcoal. When it is heated to an even higher temperature, about 930°C, impurities are driven from its ... . It does so by the process of adsorption, or by attracting these molecules to the surface.

For which of the following substances, the resistance decreases with increase in temperature? (1) Pure silicon (2) Copper (3) Nichrome (4) Platinum

Description : For which of the following substances, the resistance decreases with increase in temperature? (1) Pure silicon (2) Copper (3) Nichrome (4) Platinum

Last Answer : (3) Nichrome Explanation: Nichrome has high resistance and it is called a resistor.

Chromatography can be used to A. form mixtures B. change mixture compositions C. separate mixtures into pure substances D. all of these

Description : Chromatography can be used to A. form mixtures B. change mixture compositions C. separate mixtures into pure substances D. all of these

Last Answer : separate mixtures into pure substances

Activated Charcoal is used to remove colouring matter from pure substances by (1) Bleaching (2) Oxidation (3) Adsorption (4) Reduction

Description : Activated Charcoal is used to remove colouring matter from pure substances by (1) Bleaching (2) Oxidation (3) Adsorption (4) Reduction

Last Answer : Adsorption

For which of the following substances, the resistance decreases with increase in temperature? (1) Pure silicon (2) Copper (3) Nichrome (4) Platinum

Description : For which of the following substances, the resistance decreases with increase in temperature? (1) Pure silicon (2) Copper (3) Nichrome (4) Platinum

Last Answer : Nichrome