When an ice cube melts in your hand, it changes from a solid to a liquid. H2O (s) → H2O (l)

This is an example of _ reaction, because heat is _ the system.

a. endothermic; leaving
b. exothermic; entering
Selected: c. exothermic; leavingThis answer is incorrect.
d. endothermic; entering

Which situation would react faster and why?
a. Example B would be faster because of a high surface area.
b. Example A would be faster because of a high surface area.
Selected: c. Example A would be faster because of a low surface area. This answer is incorrect.
d. Example B would be faster because of a low surface area.

Balance the following the chemical equation:

_ Ti3N + _ MgO → _ Mg3N2 + _ Ti2O

Balance the following the chemical equation:

_ Incorrect. Ti3N + _ Incorrect. MgO → _ Incorrect. Mg3N2 + _ Incorrect. Ti2O

Balance the following the chemical equation:

_ N2 + _ O2 → _ NO

Balance the following the chemical equation:

N2 O2 → NO

Looking at the periodic table, determine the charge each atom will make when it bonds with other atoms.
Calcium (Ca)

2.

Francium (Fr):

Francium (Fr)
3.

Bromine (Br):

Bromine (Br)
4.

Sulfur (S):

Sulfur (S)
5.

Xenon (Xe):

Xenon (Xe)
6.

Carbon (C):

Carbon (C)
7.

Phosphorous (P):

Phosphorous (P)
8.

Boron (B):

Boron (B)

Column B
a. -1
b. -3
c. +4/-4
d. +3
e. +1
f. -2
g. 0
h. +2