WorksheetsChemical Changes
Total questions: 20
Worksheet time: 1hrs 12mins
C6H12O6
The student observed that the temperature changed from 25 •C to 23 •C when the solutions were combined and that a white substance rapidly formed and settled to the bottom of the container. What most likely happened to produce these results?
How many atoms in all are in a molecule of serotonin?
C10H12N2O
Which of these is NOT a sign that a chemical change has occurred?
A loss of transparency
An unexpected color change
A temperature change
The formation of a precipitate
The Law of Conservation of Mass states
that matter exists in all states and reacts the same
that matter can only be changed into new substances by introducing a catalyst
that matter exists in the same state throughout any chemical change
that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants
How many Al atoms are in this compound? 4Al2O3
2
8
6
4
How many F atoms are in this compound?
6MgF2
2
6
8
12
___________________ are the elements or compounds that leave (are formed in) a chemical reaction.
Polymers
Bonds
Reactants
Products
SnO2 + __ H2 → Sn + __ H2O
Fe + S --> FeS
Example: H2
_CF4 + _Br2 -- _CBr4 + _F2
