physical/chemical changes Flashcards
What is a physical change?
A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition.
True or False: A chemical change results in the formation of new substances.
True
Fill in the blank: Melting ice is an example of a __________ change.
physical
What is a chemical change?
A chemical change is a change that involves the transformation of one substance into one or more new substances with different properties.
Which of the following is a sign of a chemical change? (a) Change in color (b) Change in state (c) Change in size
a) Change in color
What is the main difference between physical and chemical changes?
The main difference is that physical changes do not alter the chemical composition of a substance, while chemical changes do.
True or False: Boiling water is a chemical change.
False
List one example of a chemical change.
Rusting of iron
What type of change occurs when a substance undergoes a phase transition?
Physical change
Which process is a physical change? (a) Digestion of food (b) Dissolving sugar in water (c) Burning wood
b) Dissolving sugar in water
Fill in the blank: A __________ change can often be reversed, while a chemical change usually cannot.
physical
What happens to the bonds in a substance during a chemical change?
The bonds between atoms are broken and new bonds are formed.
True or False: Freezing water is a chemical change.
False
What is an example of a physical change that involves energy transfer?
Melting or boiling
Which of the following is NOT a characteristic of a chemical change? (a) Production of gas (b) Color change (c) Change in mass
c) Change in mass
What type of change is combustion?
Chemical change
Fill in the blank: A __________ reaction is a type of chemical change that occurs when substances combine to form a new substance.
synthesis
What is an indicator of a chemical reaction?
Formation of a precipitate
True or False: All physical changes are reversible.
False
What kind of change occurs when a candle burns?
Chemical change
