Inv 5 Exp 3 - Empirical Formulas - Day 1
Quiz
•
Chemistry
•
10th - 11th Grade
•
Hard
Standards-aligned
E Hernandez
FREE Resource
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9 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
This law states that a compound contains its component elements in a fixed ratio by mass.
Law of Conservation of Mass
Law of Definite Proportions
Law of Conservation of Energy
Second Law of Thermodynamics
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the mass percent oxygen in H2SO4.
Help: Molar Mass of H2SO4 is: 98.
65.3%
32.5%
22.4%
57.1%
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
CuCl2 is a hygroscopic salt (attracts water and forms a hydrate). A 100 g sample of hydrated CuCl2 was heated to release the water (efflouresce, remember that word?). After the sample was water free, the remaining sample contained 78.8 g. How many water molecules were attached to each molecule of CuCl2?
Hint: How many moles of water were vaporized? How many moles of CuCl2 remained?
2
5
1
3
Tags
NGSS.HS-PS1-7
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
How many grams of Iodine are there in 58 grams of PbI2?
31.9
38.3
26.2
40
Tags
NGSS.HS-PS1-7
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the percent by mass of oxygen in dextrose (C6H12O6)?
53
25
33
42
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The result of a series of experiments determined that a molecule was 30.4% Nitrogen and 69.6% Oxygen by mass. What is the empirical formula of the molecule?
NO
N2O
NO2
N2O3
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A 28g sample of a compound containing hydrogen, sulfur and oxygen was found to have 0.6 g of Hydrogen, and 18.3 g of Oxygen. What is the percent composition of sulfur for this compound?
32.5%
65.4%
25%
21%
Tags
NGSS.HS-PS1-7
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