Calculate the change in enthalpy, AH, for the reaction: 2H2 (g) + 2C (s, graphite) + O2(g) → HC2H302 (1)
from the following information.
a. HC2H302 (1) + 202 (g) → 2C02(g) + 2H20 (1)
b. C(s, graphite) + O2(g) → CO2 (g)
C. H2(g) + 12 02(g) → H20 (1)
AHa = -875kJ
Днь = -394.51k
AHe= -285.5kJ

Which of the following is a testable hypothesis? a. if i brush my teeth, i will get fewer cavities than if i don't brush my teeth. b. green toothpaste tastes better than blue toothpaste or red toothpaste. c. smart, careful, healthy people always brush their teeth. d. it's wrong to not brush your teeth before you have an important conversation with someone.

Which statement best describes the oxidation numbers of the atoms found in magnesium chloride? a. magnesium has a 2- oxidation number and chlorine has a 1+ oxidation number. b. magnesium has a 2- oxidation number and chlorine has a 2+ oxidation number. c. magnesium has a 2+ oxidation number and chlorine has a 1- oxidation number. d. magnesium has a 1+ oxidation number and chlorine has a 1- oxidation number.

Identify two types of chemical bonding in the source of dietary potassium