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biology year 10
food tests
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maisie henshaw
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To test for
protein
we use
biurets
solution.
If protein is present the solutiom will turn
lilac
.
To test for starch we use iodine solution.
If starch is present the solution will turn black.
To test for
glucose
we use benedicts solution.
If glucose is present the solution will turn
orange
.
starch
and
protein
tests work best at room tempreture.
glucose
tests work best after being strongly
heated
.
Equation
for energy in 1g of food:
(
4.2
×
c
h
a
n
g
e
i
n
t
e
m
p
r
e
t
u
r
e
×
v
o
l
u
m
e
o
f
w
a
t
e
r
)
m
a
s
s
o
f
f
o
o
d
\frac{\left(4.2\times change\ in\ tempreture\times volume\ of\ water\right)}{mass\ of\ food}
ma
ss
o
f
f
oo
d
(
4.2
×
c
han
g
e
in
t
e
m
p
re
t
u
re
×
v
o
l
u
m
e
o
f
w
a
t
er
)
Energy is measured in
Joules
(J) /
Killerjoules
(KJ)
