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Raghavendra Paripelli

Apr 9, 2014



Aena

Oct 21, 2013

#### PLEASE TELL ME MY CLASS TEACHER NEVER TELLS.....



Tearing of a paper is a physical change because when the paper is torn only the appearance of the paper is changed and no new substance is formed. Since this is...

Amogh Sahhai

Jan 11, 2015

#### What is the differance between a)fast and slow change b)reversible and irreversible change c)chemical and physical d)desirable and non-desirable change e)natural and man-made change f)periodic and non - periodic change



a) Fast changes occur with in seconds or minutes. Whereas slow changes take place...

Akshaya

Mar 8, 2015



Lokesh

Sep 6, 2015

#### Define reversible change



A reversible change is a physical change that can be undone. A final substance can be converted back to the original substance without creating any new material.
Freezing, me...

Baij Nath

Jan 10, 2015

#### Why is metal rim heated before fixing on to wooden cart wheel?



Metals expand on heating and contract on cooling. This expansi...

Akshaya

Mar 8, 2015

#### Explain when a candle burns,both physical and chemical changes occur. Where in the candle do these changes occur in ?



When a candle burns both physical and chemical changes occur as candle wax turns in liquid form and this is a physical changes  ...

Sanjeev Tiwari

Jul 13, 2014

#### Formation of curd is irreversible and chhemical change. Give reason for this statement



Due to the lactobacillus bacteria  the curd ...

Yogesh Kshirsagar

Nov 25, 2016



ISHAN SINGH

Dec 27, 2015

#### what is perdiodic change



Periodic changes are changes that  occur or repeated at regular intervals  of time.
Examples of periodic changes:

Raghavendra Paripelli

Apr 9, 2014



Aena

Oct 21, 2013

#### PLEASE TELL ME MY CLASS TEACHER NEVER TELLS.....



Tearing of a paper is a physical change because when the paper is torn only the appearance of the paper is changed and no new substance is formed. Since this is...

Amogh Sahhai

Jan 11, 2015

#### What is the differance between a)fast and slow change b)reversible and irreversible change c)chemical and physical d)desirable and non-desirable change e)natural and man-made change f)periodic and non - periodic change



a) Fast changes occur with in seconds or minutes. Whereas slow changes take place...

Akshaya

Mar 8, 2015



Lokesh

Sep 6, 2015

#### Define reversible change



A reversible change is a physical change that can be undone. A final substance can be converted back to the original substance without creating any new material.
Freezing, me...

Baij Nath

Jan 10, 2015

#### Why is metal rim heated before fixing on to wooden cart wheel?



Metals expand on heating and contract on cooling. This expansi...

Akshaya

Mar 8, 2015

#### Explain when a candle burns,both physical and chemical changes occur. Where in the candle do these changes occur in ?



When a candle burns both physical and chemical changes occur as candle wax turns in liquid form and this is a physical changes  ...

Sanjeev Tiwari

Jul 13, 2014

#### Formation of curd is irreversible and chhemical change. Give reason for this statement



Due to the lactobacillus bacteria  the curd ...

Yogesh Kshirsagar

Nov 25, 2016



ISHAN SINGH

Dec 27, 2015

#### what is perdiodic change



Periodic changes are changes that  occur or repeated at regular intervals  of time.
Examples of periodic changes:

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