Which equation is not balanced?

A 2Mg (s) + O2 (g) → 2MgO (s)

B 2Mg (NO3) 2 (s) → 2MgO (s) + 4NO2 (g) + O2 (g)

C MgO (s) + HCl (aq) → MgCl2 (aq) + H2O (1)

D Mg (s) + CuSO4 (aq) → MgSO4 (aq) + Cu (s)

What best describes the relationship between [H+] and [OH-]?

How many moles are in 3.50 x 1024 atoms of yttrium

Which temperature conversion is correct? A. °C = K - 273 B. K = 273 (°C) C. K = °C - 273 D. °C = K + 273

Complete the name of an alkali that could react with phosphoric acid to make sodium hydrogen phosphate

Mercury-197 has a half life of 3 days. Starting with 300 grams, how much remains in 3 weeks? (Round to two places)

Can somebody explain step by step how to solve decomposition reactions?

Which of the following statements are correct about the chemical reaction? H2 + O2 - > H2O2 versus 2 H2 + O2 - > 2 H2O? They are both balanced chemical equations. The two reactions are equivalent. The laws of thermodynamics apply to both.

What do chemists use to describe a chemical reaction

When you drop a sugar cube in a glass of water, at first the water doesn't taste sweet. Later, it tastes very sweet. Eventually, the water will taste equally sweet throughout. What term explains molecule movement to maintain a balance?

Using density what is the mass in grams of 150mL of a liquid with a density of 1.4 g/mL