Chap 2: Atoms And Molecules Flashcards
Like other animals ….. have
Structures & mechanisms that defend them from …..
- Ants
2. attack
When threatened from above the ants shoot …. Into the air from their …..
- Volleys of formic acid
2. Abdomens
The acid that ants shoot bombards ….
The potential predator such as a hungry bird
Formic acid got its name ….
From the Latin Word ant “formica”
For a few ant species the formic acid isn’t shot out but….
Serves as a disinfectant that protects against microbial parasites
Scientists have long known that chemicals play a major role in :
- Insect Communication
- Attraction of mates
- Defence against predators
Concept 2.1
…. Is a substance that cannot be broken down to other substances by ….
- An element
2. Chemical reactions
The number of elements occurring in nature, chemists recognize are?
92
Symbol for sodium is … from the Latin word ….
- Na
2. Natrium
A …. Is a substance consisting of two or more different elements combined in a … ratio
- Compound
2. fixed
Pure sodium is a …
A) metal
B) non metal
Metal
Pure chlorine is a …
A) poisonous liquid
B) poisonous gas
Poisonous gas
After chemical combining sodium and chlorine form a …
A) gas
B) edible compound
Edible compound
A … has different characteristics than its elements.
A) metal
B) matter
C) compound
Compound
How many natural elements are there?
A) 90
B) 91
C) 92
92