S2 Unit 7 Week 1 Homework (Due 01-12-2024)
Authored by Elisa Compton
Chemistry
10th Grade
NGSS covered
Used 9+ times
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25 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the percent of oxygen by mass in a pure sample of FeC2O4?
39%
52%
44%
9.5%
Answer explanation
Remember any percent is . Use the molar mass of iron(II) oxalate as the "total" and the total mass of oxygen in the compound as the "part"
2.
MATCH QUESTION
1 min • 1 pt
Match the following compounds with their percent by mass of nitrogen.
Urea (CH4N2O)
21%
Ammonium sulfate
47%
Ammonium nitrate
26%
Ammonium chloride
35%
Answer explanation
Remember any percent is . Use the molar mass as the "total" and the total mass of nitrogen in the compound as the "part"
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the percentage by mass of fluorine in sulfur hexafluoride, a potent greenhouse gas?
22.0%
59.2%
78.0%
87.7%
Answer explanation
Remember any percent is . Use the molar mass as the "total" and the total mass of sulfur in the compound as the "part"
Tags
NGSS.HS-PS1-7
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Find the mass percentage of water in ZnSO4·7 H2O.
43.86%
46.98%
10.04%
24.56%
56.54%
Answer explanation
Remember any percent is . Use the molar mass as the "total" and the total mass of water in the compound as the "part"
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the mass percentage of water in the hydrate CuSO4 · 5 H2O?
36.08%
40.58%
24.56%
56.54%
Answer explanation
Remember any percent is . Use the molar mass as the "total" and the total mass of water in the compound as the "part"
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A sample of a calcium chloride hydrate, CaCl₂ · x H₂O(s), has a mass of 4.72g. After heating to constant mass, the mass of the anhydrate is found to be 3.56g. What is the formula of the hydrate?
CaCl₂ · 2H₂O
CaCl₂ · H₂O
CaCl₂ · 3H₂O
CaCl₂ · 4H₂O
Answer explanation
The mass lost in this experiment is water. Convert the masses of water and anhydrous salt to moles and find the mole ratio to get the number of water molecules in the formula of the hydrate.
Be sure you have a correct chemical formula for the salt!
Tags
NGSS.HS-PS1-7
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the name of Na₂CO₃ · 10 H₂O?
sodium carbonate decahydrate
sodium (II) carbonate decahydrate
sodium carbon trioxide decahydrate
sodium carbonate nonahydrate
Answer explanation
Name the salt as usual. Add the prefix corresponding to the number of water molecules to the word "hydrate" for the second part of the name.
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