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WorksheetsFinal exam : Summer school chemistry
Total questions: 20
Worksheet time: 44mins
How many Kg are in 50 dg?
K H D B d c m
5,000,000
0.005
500,000
0.0005
How many grams are in 300 mg?
K H D B d c m
3,000,000
0.3
9000
10
Which of the following is written in correct scientific notation?
2.3 x 10 -5
0.34 x 10 3
11.2 x 10 -2
9.0 x 5 2
Which is the correct way of writing 0.000006 in scientific notation?
6 x107
6 x 10 -7
6x 10 6
6x 10-6
What is the proper standard form for 2.2 x 10 -4?
22000
0.00022
0.000022
220000
What is the molar mass of Ca(NO3)2
102
204
164
1594
What is the molar mass of O2?
16
32
8
256
What is the percent of C in CO2?
44
12
72.7
27.3
What is the percent of H in C6H12O6?
6.7
12
180
0.067
How many grams of H2 are needed to make 100 g of H2O?
2 H2 + O2 --> 2 H2O
5.6
200
11.1 grams
900
How many moles of O2 are made when 30 moles of H2O2 decompose?
2H2O2 --> 2 H2O + O2
15
0.44
480
14.1
Which is the correct base unit for measuring volume?
meter
liter
grams
celsius
Which of the following has a molar mass of 34?
O2
H2O
CO2
H2O2
A sample of subsatance X contains 30g Carbon. It has a molar mass of 150g. what is the percent composition of carbon in the substance.
30
50
20
500
When using the 2 step method for solving stoichiometry the unit mole is always
1
6.02 x 1023
the coefficient
10
How many moles of NaCl are in 300ml of 5M solution?
1500
60
16.6
1.5
What is the molarity of 2L solution made from 0.5 moles of NaI?
1
4
0.04
1.5
How many Liters of solution are needed to make a 3M solution using 6 moles of KOH?
2
18
0.5
3
How many grams of KI are needed to make 2L or 1.2 M solution? [Mw KI = 166]
2.4
398.4
99.6
0.014
Which point shows a saturated solution?
A
B
C
D
