Question

One molecule of Iodine (I2) and two molecules of sodium chloride (NaCl) combine in a reaction. How many atoms are in the products?(1 point)
Responses

2
2

4
4

3
3

6
6
Question 4
Which event is an example of an exothermic reaction?(1 point)
Responses

melting ice
melting ice

combustion
combustion

decomposition
decomposition

evaporation

Answer 1

1) 6 atoms — atoms are conserved. I2 has 2 I atoms; 2 NaCl molecules have 2 Na + 2 Cl = 4 atoms; total = 2 + 4 = 6.

2) Combustion — it releases heat, so it is exothermic.