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
