Physical Property
is when something changes in the way it
looks or feels, but it stays the same substance.
physical change
A pot of boiling water releases steam into the air. Is it open or closed?
what is open systems
What is one sign that a chemical change has occurred?
what is a A new substance forms.
Matter is never destroyed or created, the mass that you begin with is always the same as the mass you will end with.
What is the law of conservation of mass?
List 3 chemical properties
Flammability
Reactivity:
pH
: A student needs to identify an unknown substance without changing it into a new substance. Which investigation would be most useful?
A. Burn the substance and observe the smoke.
B. Mix it with acid and observe the reaction.
C. Measure its density and melting point.
D. Leave it outside until it rusts.
what is Measure its density and melting point.
A person eats food and releases carbon dioxide and waste. Is the body an open or closed system?
what is a open systems
These are the 3 states of matter.
What are solid, liquid, gas,
Some substances, like vinegar and baking soda, react vigorously with each other, producing bubbles and releasing gas.
what is Reactivity
A sealed container has 60 grams of total matter before a reaction. Afterward, the student measures 58 grams. Give one possible reason for the difference.
what is matter escaping during handling.
Which property can be measured without changing a substance’s identity?
A. Flammability
B. Density
C. Ability to rust
D. Reactivity
what is density
a solid that forms when two liquids react. For instance, mixing two clear solutions might produce a cloudy, solid substance. what is the word calls
what is a precipitate
Why does an open container lose measured mass during a reaction while a sealed container does not?
what is Gas can escape from the open container, but it stays inside the sealed container. Matter is not destroyed; it moves into the surroundings