Chemistry

What is a hydrocarbon ?
A compound made up of hydrogen and carbon
A metal
An atom
An element
What percentage of the earths atmosphere is oxygen ?
68%
21%
80%
12%
What element is Na ?
Calcium
Sodium
Hydrogen
What is an alloy ?
A metal made by combining two or more mettalic elements
A name for an atom
A cell inside a plant
What are the 3 limiting factors of photoysynthesis ?
Light intestity
Carbon dioixde
Temperature
Water
Hydrogen Oxygen
What is photosynthesis ?
The process in wich vegtables make food
The earths sedimentary state
The prcoess in witch plants make their food
What would you do to check for hydrogen ?
Check to see if the water bubbles
Check if the limewater goes cloudy
The squeaky pop test
What gas used to make up most of the earths atmosphere in the earths early state ?
Hydrogen
Methane
Argon
Bromine
Carbon Dioxide
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