yearly exam Flashcards
a molecule is made up of how many elements
2 or more
compound can react to form:
elememnts
elements can react to form:
compounds
a compound is made from at least:
2 or more elements
chemical formula for salt
NaCl
is a mixture forming a sign of chemical change?
no
is a preciptate forming a sign of chemical change?
yes
is a gas being given off a sign of chemical change?
ye
what is a physical change
a change in state not structure.
chemical change
a change in structure not state
a non mettalic lattice can be formed with:
c (carbon) eg diamonds
the atomic number is
on the bottom
the possible mass # is the number
on top (rounded)
of electrons is
on the bottom
of neutrons is
mass (top)- atomic numbers(bottom)
is ph levels chaning a sign of chemical change
yes
law of conservation of matter is:
matter can not be created or destroyed
endothermic:
absorbs heat/energy
exothermic:
releases energy/heat
equation for photosynthesis
Carbon dioxide + water = glucose + oxygen gas
glucose chemical symbol
C6H12O6
