Explain why subscripts cannot change when balancing a chemical equation
Gives the amount of atoms
You can change subscripts
The identity of a substance changes
None of the above
4. Multiple Choice
30 seconds
1 pt
Define products
The substance produced in a chemical reaction
Another word for ions
A description of a reaction
Process in which atoms bond together
5. Multiple Choice
30 seconds
1 pt
Which of these are signs that a chemical reaction has occurred?
Change in color
Release of light
Change in odor
All are correct
6. Multiple Choice
30 seconds
1 pt
What is a chemical reaction?
produces or yields
an attraction between atoms
a process in which one or more substances rearrange to form a new one
state that the identity stays the same before and after
7. Multiple Choice
30 seconds
1 pt
A chemical equation is a description of a reaction using symbols
TRUE
FALSE
8. Multiple Choice
30 seconds
1 pt
Atoms separate, rearrange, and new bonds form in a chemical reaction
FALSE
TRUE
9. Multiple Choice
30 seconds
1 pt
The arrow in a chemical equation separates two or more reactants
FALSE
TRUE
10. Multiple Choice
30 seconds
1 pt
What is a coefficient?
Number of protons of that substance in a reaction
Number of electrons of that substance in the reaction
Number of units of that substance in the reaction
Number of metallic bonds
11. Multiple Choice
30 seconds
1 pt
How many hydrogen atoms are in 2 molecules of water (2H2O)?
2
3
10
4
12. Multiple Choice
30 seconds
1 pt
The law of conservation of mass states that the total mass of the reactants and the products before and after in a chemical reaction will not be the same
TRUE
FALSE
13. Multiple Choice
30 seconds
1 pt
A physical change produces new substances
FALSE
TRUE
14. Multiple Choice
30 seconds
1 pt
Which of these is NOT a step in balancing a chemical equation
Add or change subscripts
Add coefficients
Write the unbalanced equation
Count atoms of each element in the reactants and in the products
15. Multiple Choice
30 seconds
1 pt
What is the correct form to balance this equation: H2 + O2 --> H2O