WS 1.9
-
Review
m, km, g.kg. mL, L. kL
mm
1 . The average textbook is 120 Cm long and weighs 2000
JL_.
2. A tree can grow 0.7 lfi per year and can require 1OO t of water per month.
3. My TV remote weighs 89 ;l_ and it has a working range of 1000 e4
Fill in the blanks with an appropriate unit: mm, cm,
Use your scientific calculator to help solve these (don't forget units and sig
4) 7.4x19-1263 + 0.050, =
-,-I
How many sig fig's?
1049
1) 40.g
3
14) 4.10 x
103
8)
1
I.5 " l0[m'
77.1cm
A
+4;&
lt )
e)
104.01 g
12) 140.0 g
2
;
figs):
g3
E
10) 40 g
13) .0140 g
.{
15) 2.003 x
10-5 g
I
3
_f
Round off to specified # of sig fig's:
16) Round 14.989 to... 4 sf: fq.a\1
17) Round 31 ,01 1 to... 4 sf : itotO
3 sf: t5. o
3 sf : it6oo
2sf t5
2
sf 3tooo
1sf
'l gf
/O
Soooo
Calculate the following. using appropriate sig figs:
1 8) What is the volurne of a shoebox whose dimensions are 1 25 cm by 25.5 cm by 30.0 cm?
V2lxwxt =(tt-il(zi.t)ut.,'0)'-1562q.,*+8,/"ffi
19) A woman has a purse weighing 954.{ g. From it was stolen: a 121.23 g cell phone and a
11.29 g tube of lipstick! How much does the purse weigh now?
pensity
B3\.58:
ffiruD
20) A graduated cylinder is placed on an electronic balance, and the scale reads 81.19 g.
15.5 mL of acetone are added, and the scale reads 95.33
fn} ,
9:*77e
fnogg'-_[l\
fi"t -
&r,s;ry:
,^-!1,
-" l\,lrtg
D'f dt
){. t,{ I
21) Mystery object "A" has a density of 3.90
)ffis x *#
=
ltil,r nr
g/ml.
W
a
'
g. What is the density of acetone?
o,ltz tln,
Ans
lf it weighs 450 g, what is its volume?
l0a
rt
Ans
For the following: lndicate whether it is a Determinate or lndeterminate error (Use "D" or "1"):
22) f\
There was a rock stuck in the bottom of your graduated cylinder
23) D
The temperature knob on the hot-plate is otf by 10'C
!
25) D
24)
Someone dropped some German potato salad into your experiment
Misunderstanding the instructions, you used hydrochtoric acid instead of water.