Physical changes - class-VI
Description: physical changes | |
Number of Questions: 54 | |
Created by: Shaka Gupte | |
Tags: changes around us change around us changes - physical and chemical chemistry the essence of change physical and chemical changes chemical changes chemical reactions and their types physics |
Changes in which only ____________ properties of a substance change are called physical changes.
Pick up the correct statement:
Iron rod turns red on heating. The change is a ___________ .
Physical changes are ________.
Maximum conductivity would be of :
Which of them is not the characteristics of a physical change?
The process in which the state of a substance changes from solid to liquid is called:
On decreasing temperature, a liquid turns into solid. This is:
When a solid directly turns into gaseous state, it is called:
Properties like shape, magnetic properties etc. are changed in:
Dissolution of common salt or sugar in water is an example of:
When salt is dissolved in a glass of water, how many new substances are formed?
Which of the following is a physical change?
Which of the following is not a physical change?
When a substance has changes in its physical properties than it is known as:
Which one of the following is a reversible change?
Properties such as shape, size, colour and state of a substance are called it's:
Which of the following is a physical change?
The process of obtaining salt by the evaporation of sea water is a :
Which of the following is a physical change?
Which of the following is correctly matched?
Cutting of a log of wood is a chemical change.
Two changes are stated below:
(i.) A piece of magnesium gives of bright flames when burned.
(ii). A piece of iron glows red when heated strongly.
Which of these is a physical change?
Dissolving salt in water-is a/an:
Adding sodium chloride to water is a:
Pooja took a candle in a vessel and heated the vessel. Even though the candle did not burn, it changed its shape and state. What kind of change is this?
In a physical change :
Identify the substance that evaporates at room temperature.
In early winter mornings, we can see drops of water on the blades of grass. This is because of :
Dissolution of carbon dioxide gas in water is ________ change.
Melting of wax is a _________ change.
In ___________ , the properties of molecules remain same even after the change.
An iron ball at $\displaystyle { 50 }^{ \circ }C$ is dropped in a beaker of water at $\displaystyle { 50 }^{ \circ }C$. The heat will
A mixture of sand and salt can be separated by:
Match the columns
I | II | ||
---|---|---|---|
(a) | Physical change | (i) | Curdling of milk |
(b) | Chemical change | (ii) | Demagnetisation of magnets |
(iii) | Digestion of food | ||
(iv) | Crystallisation of substance | ||
(v) | Rusting of iron |
Which of the following laboratory technique would not bring a physical change in the components of a mixture?
$Ice\underset {cooling}{\overset {heating}{\rightleftharpoons}} water \underset {cooling}{\overset {heating}{\rightleftharpoons}} steam$. Identify the type of change
Melting of butter is a physical change.
Boiling water is a _____ change because _____.
According to the CRC's the melting point of cadmium bromide is $868^{\circ}C$. Which of the following equations best describes what occurs when cadmium is heated to $868^{\circ}C$?
What kind of changes is undergone when an electric bulb glows?
Your lab partner mixed two colorless solutions in the test tube. He sees no observable changes in the resulting mixture and is unable to detect any change in temperature. Based on these observations, what type of reaction has taken place?
The melting point of cadmium bromide is $568^{\circ}C$. Which of the following equations best describes what occurs when cadmium bromide is heated to $568^{\circ}C$?
Adam traveled from his home in New York down to Florida for summer vacation. So you say that Adam experienced both a change in temperature and a change of state! When we study states of matter in chemistry, it is important to focus on atoms (not Adam).
Which of the following BEST describes the differences between atoms of solid sodium and atoms of liquid sodium?
You mix two colorless solutions and the resulting mixture becomes cloudy. What type of reaction was observed?
Your lab partner mixed two colorless solutions in the test tube. He sees no observable changes in the resulting mixture and is unable to detect any change in temperature. Based on these observations, what type of reaction has taken place?
Dissolving sugar in water is an example of:
When the hot metallic substance is cooled there is __________ in its volume.
If the substance is expanded on melting, the melting point ______ when the pressure is increased.
Water in freezing form may break rocks into pieaces due to their property of:
You are presented with three bottles $A, B, C$ each containing a different liquid. Bottles are labeled as follows:
Bottle $A$: ionic compound - Boiling point $30^{\circ}C$
Bottle $B$: molecular compound - Boiling point $29.2^{\circ}C$
Bottle $C$: molecular compound - Boiling point $67.1^{\circ}C$
Choose the correct statement.
A filler is a substance added to make a material less expensive, or for: