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WorksheetsPhysical and chemical changes
Total questions: 55
Worksheet time: 52mins
Which of the following is a example of physical change ?
burning of wood
photosynthesis
melting of ice-cream
ripening of fruit
What does the picture represent ?
physical change
chemical change
Observe the picture and choose the correct option.
Irreversible physical change
Reversible physical change
Choose the picture that shows chemical change.
In physical change , the substance formed has different properties than the original substance.
True
False
A chemical change may involve
Evolution of gas
Change in temperature
Change in colour
All of the above
When a candle burns, both physical and chemical changes occurs.
True
False
Which of the following is an example of a physical change?
a bike rusting
toast burning
butter melting
food spoiling
Which of the following is an example of a chemical change?
a penny tarnishing
a mirror being scratched
hair being cut
water being boiled
Which of the following examples provides evidence of a PHYSICAL change?
Wood is burned and releases ash and smoke
Iron rusts over time
When mixed, baking soda and vinegar form gas bubbles
Boiling water bubbles when heated
A white tablet is dropped into water. The water becomes cloudy and bubbles are produced. What type of change has occurred?
Physical change
Chemical change
No change
Which observations prove a chemical change occurred
Dissolving and expected color change
Mixing and dissolving
State of matter change and boiling water bubbles
Unexpected color change and temperature change
What is physical change?
How two chemicals react with one another when combined
A property that we can measure or observe with our 5 senses or other tools
When two chemicals react with one another to form a new substance
When a change occurs but it does not result in the formation of a new substance
Which of these is a clue that a chemical change is happening?
Fizzing or bubbling
Color changes
Creation/loss of heat
All of these are clues that a chemical change is happening.
Which of the following is a sign that a chemical reaction (or change) has occurred?
change in shape
melting
formation of a gas
dissolving
Frying an egg to make an omelette is a _______________ change
Reversible change
Irreversible change
Students mixed two liquids in a beaker and listed their observations. Based on these observations, which statement contains the best evidence that a chemical reaction occurred?
There is a change in shape.
There is a change in volume.
The two liquids mix into a solution.
The two liquids form a new substance.
Which statement best describes evidence that a chemical reaction occurs as a cake bakes?
The water in the cake batter evaporates.
The cake rises as gas bubbles form in the baking cake.
The cake takes the shape of the container in which it is baked.
The water in the cake batter is used to keep the cake moist as it bakes.
When Magnesium ribbon is burnt in oxygen, the product obtained is ___.
Magnesium chloride
Magnesium sulphate
Magnesium carbide
Magnesium oxide
When Magnesium ribbon is ignited using a candle flame, it burns with a __________.
sparkling red light
dull yellow light
bright green light
brilliant white light
Which of the following is/are true when milk changes to curd?
(i) Its state is changed from liquid to semi solid
(ii) It changes color
(iii) It changes taste
(iv) The change cannot be reversed.
Choose the correct option from the ones given below:
(i) and (ii) are correct
(ii) and (iii) are correct
(i), (iii) and (iv) are correct
All are correct
The gas that we use in the kitchen is liquefied petroleum gas (LPG). In a cylinder, it exists as a liquid. When it is released from the cylinder it becomes a gas (Change A), and then it burns (Change B). Which of the following is true?
Process A is a Physical Change
Process B is a Chemical change
Both processes A and B are chemical changes
Both (a) and (b) are True
“Adding salt to water changes the taste of water.” Which of the following statements is true regarding this change?
It is a chemical change because a new substance is formed.
It is a physical change because the original substance can be recovered
It is a chemical change because the salt cannot be recovered.
It is a physical change because there is a slight change in colour.
On the basis of the following diagrams/pictures, answer the question given thereafter. Which of the following changes represent a chemical change?
Only (i)
Only (ii)
(i) and (ii)
Neither
Which type of chemical reaction has two or more reactants to make one product?
combustion
single displacement
double displacement
synthesis
decomposition
Identify the following chemical reaction.
2 NaBr + 1 Ca(OH)2 ----> 1 CaBr2 + 2 NaOH
Synthesis (or combination)
Decomposition
Single displacement
Double displacement
Identify the following chemical reaction.
3 HBr + 1 Al(OH)3 ----> 3 H2O + 1 AlBr3
Synthesis (or combination)
Decomposition
Single displacement
Double displacement
Identify the following chemical reaction.
Pb + FeSO4 ----> PbSO4 + Fe
Synthesis (or combination)
Decomposition
Single displacement
Double displacement
What reaction has the following general formula:
AB --> A + B
Synthesis
Decomposition
Single Replacement
Double Replacement
Combustion
What reaction has the following general formula:
A + CD --> C + AD
Synthesis
Decomposition
Single Replacement
Double Replacement
Combustion
What reaction has the following general formula:
AB + CD --> CB + AD
Synthesis
Decomposition
Single Replacement
Double Replacement
Combustion
What reaction has the following general formula:
A + B --> AB
Synthesis
Decomposition
Single Replacement
Double Replacement
Combustion
Which chemical reaction always starts with a hydrocarbon that reacts with oxygen and produces carbon dioxide and water?
Decomposition
Synthesis
Combustion
Single Replacement
Which phrase describes what happens to atoms in a chemical reaction?
never lost or gained, just rearranged
sometimes lost, never rearranged
sometimes lost, gained, or rearranged
lost or gained, never rearranged
Which of the following is a compound?
zinc (Zn)
magnesium (Mg)
sodium chloride (NaCl)
potassium (K)
Which of the following is an element?
potassium chloride (KCl)
water (H2O)
carbon (C)
calcium carbonate (CaCO3)
What reaction has the following general formula:
CxHy + O2 −>CO2 + H2O
Combination
Decomposition
Single Replacement
Double Replacement
Combustion
What type of reaction involves ions from 2 compounds exchanging places to form 2 completely new compounds?
Single Displacement Reaction
Double Displacement Reaction
Synthesis Reaction
Decomposition Reaction
When a scientist mixed two chemicals, an exothermic reaction takes place. Which of the following would be proof that the reaction was exothermic?
a change of color
a change of state
a temperature decrease
a temperature increase
Which phrase describes what happens to atoms in a chemical reaction?
never lost or gained, just rearranged
sometimes lost, never rearranged
sometimes lost, gained, or rearranged
lost or gained, never rearranged
Which of the following is a compound?
zinc (Zn)
magnesium (Mg)
sodium chloride (NaCl)
potassium (K)
__Li + __Cl2 -> __LiCl
Which of the following chemical equations is balanced?
Ca + 2O2 --> 2CaO2
3Ca + O2 --> 3CaO2
3Ca + 2O2 --> 5CaO2
Ca + O2 --> CaO2
