Which of the following pairs of elements is most likely to form a covalent bond? A. Sodium and chlorine B. Magnesium and Oxygen C. Phosphorus and Bromine D. Copper and Oxygen

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Given the balanced equation: CaCO3 (s) + 2HCl (aq) - - >CaCl2 (aq) + H2O (l) + CO2 (g) What is the total number of moles of CO2 formed when 20. moles of HCl is completely consumed? (1) 5.0 mol (3) 20. mol (2) 10. mol (4) 40. mol

The characteristics of two different types of reactions are shown below: Reaction A: An atom loses electrons during the reaction. Reaction B: An atom loses protons and neutrons during the reaction.

True or false? The molar mass of a gas determines the amount of kinetic energy of the gas.

Once the sun goes down will the air or water cool of faster

Which equation obeys the law of conservation of mass? A. 2Fe+3O2 - -> 2Fe2O3 B. 4Fe+O2--> 2Fe2O3 C. Fe+O2--> Fe2O2 D. 4Fe+3O2--> 2Fe2O3

Why do airbags fill evenly with gases?

In which of the following reactions will Kc = Kp? In which of the following reactions will Kc = Kp? (A) SO3 (g) + NO (g) ↔ SO2 (g) + NO2 (g) (B) 2 N2 (g) + O2 (g) ↔ 2 N2O (g) (C) 4 NH3 (g) + 3 O2 (g) ↔ 2 N2 (g) + 6 H2O (g) (D) 2 SO2 (g) + O2 (g) ↔ 2

Which tool is most suitable for a chemist to measure the mass of a liquid

What is the equation adheres to the law of conservation of matter