Which of the following is an example of an irreversible physical change? a. boiling soup b. burning wood c. freezing water d. cracking an egg

A neutral isolated atom has a ground state configuration of 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 3. Identify the element. 1. The question cannot be answered unless the atomic weight is known. 2. Argon (Ar). 3. Vanadium (V). 4. Phosphorus (P). 5.

Which is one way to determine whether a reaction was a chemical reaction or a nuclear reaction? A) Check for a change in total mass during the reaction B) check to see if any energy was released during the reaction C) Measure the temperature change

You can increase the surface area of a block of ice by

A certain weak acid, ha, has a ka value of 3.6*10-7. part a calculate the percent ionization of ha in a 0.10 m solution. express your answer to two significant figures and include the appropriate units. view available hint (s)

Which is an example of a heterogeneous mixture? Coffee, soil, gelatin or air

A balloon is filled with 12L of air at a pressure of 2 atm. What is the volume of ballon if the pressure is changed to 3 atm?

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.