Name:___________________________________
Date:_______________
Period:___
Review Chemistry I Unit 1: Measurement & Lab Skills
1.
Express 580,000 in scientific notation. ________________________
2.
Express 2.03 x 106 in standard notation. _________________________
3.
Express 0.000 000 320 in scientific notation. __________________________
4.
Express 4.1 x 10–4 in standard notation. ___________________________
5.
Define accuracy: ______________________________________________________.
6.
Define precision: ______________________________________________________.
7.
Six different people weigh a standard mass of 5.00 g on the same balance. Each person obtains a
reading of 2.50 g for the mass of the standard.
Is the balance accurate? ____
Is the balance precise? _____
Explain: ______________________________________________________________________
8.
These values were recorded as the mass of products when the same chemical reaction was carried out
three separate times: 3.20 g; 2.87 g; 3.89 g.
The correct mass of products from that reaction was actually 3.45 g.
Are the measured masses accurate? ____
Are the measured masses precise? ____
Explain: ______________________________________________________________________
9.
List the base unit and symbol for:
Length: ___________
Mass: ___________
Volume: ___________
10.
Rewrite the metric prefixes in order from largest to smallest.
deci- (d)
milli- (m)
kilo- (k)
centi- (c)
___________________________________________________
11.
Order the following masses from smallest to largest.
cg
mg
kg
dg
___________________________________________________
1
12.
What is the quantity 65.5 m expressed in cm? __________________
13.
Convert 2.3 mL into L. _____________________
14.
1 m is equal to ________ cm.
15.
A student must find the mass of a sample of sulfur powder. The equipment he has
triple beam balance, plastic weighing dish, and a scoopula.
available are a
Describe a procedure for how the student can find the mass of the powder.
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
16. A student uses a triple beam balance
to determine the mass of a metal
block. The riders of the balance are
adjusted as shown below.
0
100
200
300
400
3.0 cm
1.5 cm
1.2 cm
500
0
10
20
30
40
50
60
70
80
90
100
0
1
2
3
4
5
6
7
8
9
10
What is the mass of the metal block?
Mass: ________ g
Using the measurements given in for the block, calculate the volume of the block
Volume: ___________ cm3
2
Use the following information to answer questions 17,18 and 19 below.
A student has been given solid metal strips and a beaker of acid. She pours exactly 50.0 mL of acid into a flask.
She uses an electronic balance to measure a metal strip of 50.0 g and adds it to the flask.
She uses the apparatus to the right to collect and measure the hydrogen gas produced under a standard pressure
of 1 atmosphere.
metal
strip
in
acid
The student continues her experiment using 20.0 g, 10.0 g, and 5.0 g metal strips. She carefully measures and
records the volume of gas formed each time. The data table is shown below.
Mass of solid (g)
Pressure (atm)
Volume of gas (mL)
50.0
1.00
83.0
20.0
1.00
34.7
10.0
1.00
18.3
5.0
1.00
8.9
50.0
76.50
23.8
17.
What is the independent variable in this experiment? _________________
18.
What is the dependent variable in this experiment? __________________
19.
What is the controlled variable in this experiment? _____________________
Explain: ______________________________________________________________________
20.
A student completed an experiment measuring the mass and volume of a solid.
The student plotted four data points on a graph of Mass vs. Volume shown below:
M
V
What property does the slope of the best fit line represent about the solid: ___________
3