Chemical Composition
Quiz
•
Science
•
7th - 8th Grade
•
Hard
W T
Used 17+ times
FREE Resource
13 questions
Show all answers
1.
FILL IN THE BLANK QUESTION
20 sec • 1 pt
An element is a substance that cannot be broken down into two or more simpler substances by chemical processes.
What is missing in this description?
2.
MULTIPLE CHOICE QUESTION
10 sec • 1 pt
Which element is found in Group 15 and Period 3?
astatine
nitrogen
phosphorous
silicon
3.
FILL IN THE BLANK QUESTION
10 sec • 1 pt
What is the chemical formula for carbon monoxide? (You may key in the number of atoms, if any, in the normal size, e.g. H2O for water)
4.
FILL IN THE BLANK QUESTION
10 sec • 1 pt
What is the chemical formula for ammonia? (You may key in the number of atoms, if any, in the normal size, e.g. H2O for water)
5.
FILL IN THE BLANK QUESTION
20 sec • 1 pt
How many atoms are there in one unit of Al2(CO3)3?
6.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
Scandia (Sc2O3) is a compound that is made of scandium and oxygen chemically combined in a fixed ratio.
This statement is complete.
This statement is incomplete.
This explanation is incorrect.
Answer explanation
You need to include the ratio.
Scandia (Sc2O3) is a compound that is made of scandium and oxygen chemically combined in a fixed ratio of 2 : 3.
7.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
Dinitrogen tetroxide (N2O4) is a compound that is made of nitrogen and oxygen chemically combined in a fixed ratio of 1 : 2.
This statement is complete.
This statement is incomplete.
This explanation is incorrect.
Answer explanation
You do not simplify the ratio when describing the chemical formula. If you wrote it as 1 : 2, you would be describing nitrogen monoxide (NO2).
Dinitrogen tetroxide (N2O4) is a compound that is made of nitrogen and oxygen chemically combined in a fixed ratio of 2 : 4.
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