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WorksheetsQ1 - Summative Science - 4
Total questions: 87
Worksheet time: 1hrs 8mins
A ________ _______ is a change that takes place when material
changes its physical appearance .
(a)
Crumpling a paper is an example of a physical change.
True
False
Ice melting into water is also an example of a physical change.
True
False
A physical change that can be easily undone.
(a)
Cutting of paper into pieces in an example of __________ ___________.
(a)
Applying (a) to a solid object can result in physical change. It causes the object to
reshape or deform .
(a) is forcing a straight object to curve or arch. Solid materials that are flexible easily
bend without breaking.
Materials that are flexible may also bend but will break at a
certain point.
True
False
The bent spoon may be returned to its original form by bending it back using the same amount of force applied to it before.
True
False
copper wire is an example of material that bends
true
false
Bending is applied to molten glass to form a desired shape for the final glass.
True
False
(a) is the application of force to compress a given material.
Pressing a material changes its shape, size, and texture.
True
False
bread dough is an example of material that can be pressed
true
false
Pressing is useful, especially for metals, for changing them into sheets for different
applications, especially for metals.
True
False
Aluminum metal is an example of material that is being pressed to form
aluminum foil, which can be used for food packaging.
true
false
There are objects that return back to their original state after being pressed.
true
false
(a) are made up of polyurethane, which recovers quickly back to its original shape after being pressed. Due to this property,
this material is often used in making mattresses and pillows.
Another way to press a solid material is through (a) .
Hammer can be used to pound or strike an object to compress it.
When a solid material, like a metal, is hammered, it doesn't changes its size and shape.
true
false
(a) uses the use of a blunt tool or object, like a pestle or round rock, to compress materials and break them into smaller sizes. It changes the shape and size of a material.
(a) uses the use of a sharp tool , such as scissors or knives, to reduce the size of objects. It also changes the size and shape of a material.
Reshaping solids results in changes in their physical appearances. Even if the size, shape, or texture changes, the solid materials remain the same, and no new material is formed.
true
false
When material changes both physically and chemically, a _________ __________ occurs. It
occurs when a material is combined with another material to form an entirely new material.
(a)
___________ ____________ are mixtures that are not uniform in appearance and composition.
Homogeneous mixtures
Heterogeneous mixtures
Vinegar added to baking soda is an example of a chemical change.
true
false
An __________ ________ cannot be undone once the change has taken place, just like checmical change.
(a)
Chewing food, burning paper, and rotting food are other examples of chemical change.
true
false
A new material is formed in a chemical change.
true
false
Chemical changes are irreversible, while physical changes can be reversible or irreversible.
true
false
Changes are irreversible if you can transform the resulting material back to its
original form.
true
false
Changes are reversible if you cannot transform the resulting material back to its original form.
true
false
It is a change in form where you force a straight object to curve or arch.
hammering
bending
pressing
crushing
cutting
It is a change in form that involves using a sharp tool, such as scissors or knives, to reduce the size of objects.
crushing
bending
cutting
pressing
hammering
It is a change in form where a hammer is used to pound or strike an object to compress it.
crushing
cutting
hammering
bending
pressing
It is a change in form characterized by a compression in a given material mainly due to a force previously applied.
bending
hammering
cutting
crushing
pressing
It is a change in form that involves using a blunt tool or object to compress materials and break them into smaller sizes.
crushing
cutting
pressing
bending
hammering
(a) are tiny particles that make up all materials. These particles are constantly moving. Their movement is highly affected by temperature.
T he higher the temperature of the material, the faster the movement of its particles.
The lower the temperature, the slower the particles move.
True
False
Liquids do not have a definite shape. They take the shape of the container.
True
False
Gases have no definite shape and can easily escape a container.
True
False
This change from solid to liquid is called (a) .
The opposite of melting is (a) . This happens when liquid is cooled, and its temperature decreases.
The particles will come together and form a solid matter when temperature is low.
true
false
Liquids when further heated, are turned into gas as the liquid particles are given sufficient energy to move apart from each other and expand into the available space. That process is called (a) .
(a) is the process in which a gas is converted to a liquid.
(a) is responsible for ground-level fog, for the fogging up of glasses when you go from a cold room to the outdoors, and for the water dripping off the outside of a cold beverage.
The movement of atoms is not affected by temperature.
True
False
A material changes physical states due to changes in temperature.
true
false
A change in state is a physical change.
true
false
When heat is applied, matter in a more compact state changes to a less compact state.
True
False
When heat is removed, matter in a less compact state changes to a more compact state.
True
False
drying of wet towel under the sun
(a)
heating of butter
(a)
formation of dews on leaves on a cold day
(a)
making of an ice candy
(a)
drying of land on a hot day
(a)
__________ are mixtures that are uniform in appearance. The individual
materials mixed in a homogeneous mixture can no longer be identified.
Homogeneous mixtures
Heterogeneous mixtures
A (a) is the material that is dissolved.
A (a) is a substance that dissolves. It is also called the dissolving medium.
When the coffee powder is mixed with water, it produces a mixture with a uniform appearance, is an example of
(a)
Fruit salad is an example of _________ _________ .
(a)
An example of two liquids that do not mix thoroughly is oil and water. It is an example of ______________ ________.
(a)
Homogeneous mixtures are mixtures that are not uniform in appearance.
true
false
Heterogeneous mixtures are mixtures that are uniform in appearance and composition.
true
false
A solid is said to be (a) in a liquid if it gets dissolved, resulting in a homogeneous mixture
A liquid is said to be (a) in another liquid if it gets dissolved, resulting in a homogeneous mixture.
These are mixtures which are uniform in appearance.
(a)
This is used to describe solids that dissolve in a liquid.
(a)
This is used to describe liquids that dissolve in other liquids.
(a)
These are mixtures which do not have a uniform appearance and composition.
(a)
Some mixing processes produce heat. For instance, when we dissolve two solvents, ethanol and acetone, the temperature of the flask heats up.
true
false
Mixing ethanol and water will absorb heat and cause the temperature of the flask to drop, making it cold to the touch.
true
false
An example is burning rubber, plastics, and other nonbiodegradable materials. Burning such garbage can release black smoke, which can cause sickness once inhaled.
(a)
A (a) material usually has a flame symbol on its label. Chemicals like LPG, matches, gasoline, alcohol, and other flammable materials, should not be exposed to heat and flames.
A (a) material is a material that is toxic or dangerous to human health and can even cause death. It usually has a skull symbol printed on its label to warn others
(a) are substances that can cause cancer.
Identify if the following changes are useful or harmful to humans and the environment.
burning of rubber tires
(a)
Identify if the following changes are useful or harmful to humans and the environment.
hammering metal to create thin sheets
(a)
Identify if the following changes are useful or harmful to humans and the environment.
wrapping gifts with newspapers and magazines
(a)
Identify if the following changes are useful or harmful to humans and the environment.
throwing used oil in bodies of water
(a)
Identify if the following changes are useful or harmful to humans and the environment.
smelling a can of kerosene
(a)
Identify if the following changes are useful or harmful to humans and the environment.
reusing plastic bags
(a)
Identify if the following changes are useful or harmful to humans and the environment.
burning forests
(a)
Identify if the following changes are useful or harmful to humans and the environment.
planting crops
(a)
Identify if the following changes are useful or harmful to humans and the environment.
disposing of wastes properly
(a)
Identify if the following changes are useful or harmful to humans and the environment.
cleaning our backyard regularly
(a)
