1. Reactants and products day 2
2-7-18
Get ready for bell work

2. 1. When balancing equations, you can NEVER change the ...
a. Coefficient
b. Subscript
c. Whole number
d. Atom

3. 2. Table salt (NaCl) is the product of a chemical reaction.
Below is a description of this chemical reaction.
Two atoms of Sodium plus two atoms of Chlorine yields one Sodium Chloride molecule
Which of the following choices is the product of this reaction?
Sodium Chloride
Chlorine
Sodium

4. 3. The reaction below shows potassium (K) reacting with oxygen (O2) to form potassium oxide. (KO2). The mass of potassium is 39 grams and the mass of oxygen is 32 grams.
K + O KO2
What is the mass of potassium oxide from this equation?
39 grams
142 grams
71 grams

5. What is the maximum number of electrons that can be in an atom’s 1st energy shell?2 18 24 8

6. 5. The law of conservation of mass states that no atoms are created or destroyed during reactions.
Which equation best represents the law of conservation of mass? a. b. c.

7. How many neutrons does each boron atom contain, and what is Boron’s atomic number?
a. Boron has 16 neutrons, and the atomic number is 5.
b. Boron has 10.8 neutrons, and the atomic number is 15.8
c. Boron has 6 neutrons, and the atomic number is 5.

8. 7. All three of these elements are in the second period.
12.0 C
Carbon 6
Two-Part Question
How many electron shells does each atom of nitrogen contain, and what is the atomic number of carbon?
a. They all have 4 electron shells. Carbon’s atomic number is 6.
b. Nitrogen has 7 electron shells. Carbon’s atomic mass is 12.0
c. They all have 2 electron shells. Carbon’s atomic number is 6.

9. Get Ready to check bell work!
Law of Conservation of Mass video

10. 1. When balancing equations, you can NEVER change the ...
a. Coefficient
b. Subscript
c. Whole number
d. Atom

11. 2. Table salt (NaCl) is the product of a chemical reaction.
Below is a description of this chemical reaction.
Two atoms of Sodium plus two atoms of Chlorine yields one Sodium Chloride molecule
Which of the following choices is the product of this reaction?
Sodium Chloride
Chlorine
Sodium

12. 3. The reaction below shows potassium (K) reacting with oxygen (O2) to form potassium oxide. (KO2). The mass of potassium is 39 grams and the mass of oxygen is 32 grams.
K + O KO2
What is the mass of potassium oxide from this equation?
39 grams
142 grams
71 grams

13. What is the maximum number of electrons that can be in an atom’s 1st energy shell?2 18 24 8

14. 5. The law of conservation of mass states that no atoms are created or destroyed during reactions.
Which equation best represents the law of conservation of mass? a. b. c.

15. How many neutrons does each boron atom contain, and what is Boron’s atomic number?
a. Boron has 16 neutrons, and the atomic number is 5.
b. Boron has 10.8 neutrons, and the atomic number is 15.8
c. Boron has 6 neutrons, and the atomic number is 5.

16. 7. All three of these elements are in the second period.
12.0 C
Carbon 6
Two-Part Question
How many electron shells does each atom of nitrogen contain, and what is the atomic number of carbon?
a. They all have 4 electron shells. Carbon’s atomic number is 6.
b. Nitrogen has 7 electron shells. Carbon’s atomic mass is 12.0
c. They all have 2 electron shells. Carbon’s atomic number is 6.

17. I Can…
Identify products Identify reactants Show proof of the law of conservation of mass TOC #13 How to balance equations #14 Balance equations practice

19. Example #1 Work these out with your Same B-day Partner
__ Fe + __S → __FeS Element Before After Fe = ____ _____ S = ____ _____

20. __H2 + __O2 → __H2O Element Before After H = ____ _____ O = ____ _____
Example #2
__H2 + __O2 → __H2O Element Before After H = ____ _____ O = ____ _____

21. Example #3
__Mg + __O2 → __MgO Element Before After Mg = ____ _____ O = ____ _____

23. Law of Conservation of Matter song