WorksheetsLMS 8th Grade Science Homework #6
Total questions: 20
Worksheet time: 32mins
C6H12O6
The student inferred that a chemical reaction occurred. What evidence supports this inference?
The zinc metal remained silver-colored and shiny
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?
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
An gel ice pack getting cold after you put it in the freezer for an hour.
Chemical change
Physical change
Which of the following IS a physical change?
Getting a haircut
Rusty metal
sour milk
A compound
___________________ are the elements or compounds that leave (are formed in) a chemical reaction.
Polymers
Bonds
Reactants
Products
How many protons does an atom of Chromium have?
52
24
28
12
How many neutrons does and atom of Beryllium have?
9
4
5
2
What is the mass of an atom of Neon?
20
10
30
5
How many electrons does an atom of Gallium have?
70
31
39
15
