Chemistry Unit review Flashcards
Matter:
Anything that takes up space and has volume.
Define element (pure substance)
A pure substance that cannot be broken down into simpler parts by chemical methods.
define compound.
A substance made of two or more different elements that are chemical combined.
define homogeneous mixture
A mixture where only one phase is visible.
define heterogeneous mixture.
a mixture where more than one phase is visible.
define physical property.
a characteristic of a substance that can be observed or measured without changing the identity of the substance.
List the 3 characteristic properties
-freezing point
-melting point
-boiling point
define chemical property.
the ability of a substance to change or react with another substance and form one or more new substances.
define stability.
The ability of a substance to remain unchanged.
Define toxicity.
The ability of a substance to cause harmful effects in plants and animals.
define combustibility.
The ability of a substance to burn in air.
What’s the unique chemical property used to define hydrogen?
a lit wooden splint makes a popping sound in a test tube of hydrogen.
what is the unique chemical property used to define oxygen?
a glowing wooden splint relights in a test tube full of oxygen.
what is the unique chemical property used to identify carbon dioxide?
limewater turns milky in the presence of carbon dioxide.
List the five indicators of a chemical change.
-Change in colour or odour
-Bubbles appear or a gas is formed
-Heat or light is produced
-A new solid is formed
-The change cannot be reversed
What is the common name of H2O?
Water
What is the common name of NaCl?
Table salt
What is the common name of CO2?
Carbon dioxide
What is the common name of NH3?
Ammonia
What is the common name of O2?
Oxygen
What is the common name of O3?
Ozone
