If the temperature changes in a chemical reaction, what has occurred?

What mass of hydrogen is produced from the reaction of 50.0 g of Mg and 75.0 g of HCl? How much of the excess reagent is left over? Mg + 2HCl → MgCl2 + H2

Isotopes of the same element must have the same number of - a protons + neutrons. b neutrons. c electrons. d protons.

Suggest two reasons why the noble gases become less ideal in their behavior down the group from helium to xenon.

When the moon is farthest from the sun and viewed from earth, the moon appears to be a ... ?

Which statement describes the charge and location of an electron in an atom?

When a solution is considered to have a high concentration of hydrogen ions (H+) is also considered to be? a) acidic b) basic c) neutral d) hot

Why does the sky change colors at sunset? 1 because the sun changes colors 2 because the atmosphere reflects colors 3 because long wavelengths are scattered the least 4 because short wavelengths are scattered the least

Consider the reaction N2 (g) + 3 H2 (g) 2 NH3 (g), which is exothermic as written. What would be the effect on the equilibrium position of adding N2 (g) ?

According to Table I, which equation represents a change resulting in the greatest quantity of energy released? 1. 2C (s) + 2H2 (g) - > C2H4 (g) 2. 2C (s) + 3H2 (g) - > C2H6 (g) 3. N2 (g) + 3H2 (g) - >2NH3 (g) 4. N2 (g) + O2 (g) - > 2NO (g)

Calculate the number of liters in 3.25 g of ammonia