Physical Changes
What is the definition of a Physical Change?
When a substance is changed but does not become a new substance.
What does the O in CGOLTP stand for?
Odor- smell
Which of the following is an example of a Physical Property?
A. The basketball is orange
B. The gasoline is flammable
C. The bike is rusted
D. The cheese is moldy
A. The basketball is orange
Which of the following is an example of a Chemical Property?
A. Gasoline is highly flammable
B. Copper is a shiny metal
C. Water boils at 100 degrees Celsius
D. Salt dissolves in water
A. Gasoline is highly flammable
To make Kool-Aid you mix sugar, water, and flavoring in a pitcher. This is an example of a _______ change.
Physical
Which of the following is not a Chemical Change?
A. Sugar dissolving in water
B. Rotting food
C. Metal tarnishing
D. Baking soda reacting to vinegar
A. Sugar dissolving in water
True or False:
Physical changes only alter the appearance of a substance, not its compostion.
True
Which of the following is an example of a Physical Property?
A. The bicycle chain is rusty
B. The liquid is transparent
C. The chemicals react when mixed together
D. The bread is moldy
B. The liquid is transparent
True or False:
All chemical changes produce gas, bubbles, or odor.
False
Which of the following results in a new substance being formed?
A. Physical Change
B. Physical Property
C. Chemical Change
D. Chemical Property
C. Chemical Change
Which is a physical change?
A. Piece of wood burning
B. A copper roof changing color
C. Rust forming on an iron fence
D. A sheet of paper shredding
D. A sheet of paper shredding
Which action will cause sugar to form a new substance?
A. Cooking sugar on a stove
B. Pouring sugar through a screen
C. Dissolving a sugar cube in water
D. Crushing a sugar cube into pieces
A. Cooking sugar on a stove
What is the definition of a Physical Property?
A characteristic that is observed or measured without changing the identity of a substance.
Which of the following is a chemical property of iron?
A. It is a magnetic solid
B. It has a high melting point
C. It reacts with oxygen and water to form rust
D. It conducts electricity
C. It reacts with oxygen and water to form rust
What is the main difference between a Physical and Chemical Change?
Physical Changes, alter the appearance, & Chemical Changes, alter the composition of a substance.
Chopping wood, crushing a can, and shredding paper are all physical changes because they only change the _______ of the object, not its chemical composition.
Shape, size, form
Which of the following is an indicator that a chemical change has occurred?
A. The substance changes size
B. An unexpected change in color occurs
C. The substance dissolves in water
D. The substance melts into a liquid
B. An unexpected change in color occurs
Which of the following is NOT a physical property?
A. Boiling point
B. Density
C. Flammability
D. Magnetism
C. Flammability
What is the definition of a Chemical Property?
A characteristic that can only be observed by changing the identity of the substance
Which of the following represents a chemical change resulting from energy release?
A. A lightbulb turning on when flipped by a switch
B. Water boiling and turning into steam on a stove
C. A glow stick glowing after being cracked
D. Ice melting on a hot sidewalk
C. A glow stick glowing after being cracked
When a substance changes from a solid directly to a gas without turning into a liquid first (sublimation), it is undergoing a type of _______.
Phase Change
When two clear liquid solutions are mixed together and a solid suddenly forms and settles at the bottom, this solid is evidence of a chemical change and is called _______.
A precipitate
The temperature at which a solid turns into a liquid is called its _______ point, which is a physical property.
Melting
The ability of a substance to react with oxygen, acidity, or other substances is known as its _______.
Reactivity
_____ occurs when a substance undergoes a change in appearance, such as dissolving. _____ occurs when a new substance is formed with one form of evidence being color change.
Physical Change, Chemical Change