Can two different samples of the same substance have different physical properties? Chemical properties?

If a mixture of gases contained 78% nitrogen at a pressure of 984 torr and 22% carbon dioxide at 345 torr, what is the total pressure of the system?

How many grams of K2CO3 would you need to put on the spill to neutralize the acid according to the following equation? 2HBr (aq) + K2CO3 (aq) →2KBr (aq) + CO2 (g) + H2O (l)

How many atoms are in 0.750 moles of zinc?

Why did the vinegar erupt when I put the baking soda?

The half-life of a certain radioactive element is 1250 years. what percent of the atom remains after 7500 years?

What ionic bond occurs between what particles? A. Two Negative Ions B. A positive and negative ion C. Two positive ions D. Two neutral atoms

Which of the following are good traits of a hypothesis? it will be able to be tested it can predict an outcome it will explain the observations all of these

What is the mass of a box of nails

In a phase change of water between the liquid and the gas phases, 770.1 kJ of energy was released by the system. What was the product, and how much of it was formed in the phase change? (dа ta: H₂O (l) → H₂O (g) ΔH = 44.01 kJ/mol.) A.

Explain the problem surrounding the ammonia-making process in terms of chemical equilibrium. Chemical equation for producing ammonia: N2 + 3H2 ⇌ 2NH3 + energy