module 6 (chemical reactions) Flashcards
1
Q
define physical change
A
a change which does not make a new substance, the original substance changes state, form, shape or size
2
Q
define a chemical change
A
a change which creates a new substance, reactant atoms are re arranged to form new products
3
Q
what is the equation for combustion?
A
fuel + oxygen -> carbon dioxide + water
4
Q
define fermentation
A
anaerobic respiration in yeast
5
Q
what is the equation for fermentation?
A
glucose (in water) -> ethanol + carbon dioxide (+ energy)
6
Q
define the conservation of mass
A
atoms in the reactants will always be the same as the atoms in the products, unless able to escape
7
Q
what is the equation for rusting?
A
iron + oxygen + water -> iron oxide
