Two substances each have a temperature of 23 degrees Celcius. After they are combined the temperature rises to 27 degrees Celcius. What evidence proves a chemical reaction occurred?

Consider oxygen, which has an atomic number of 8 and an atomic mass of 16. how many valence electrons does it have? a. 2

Temperatures in June in the Paradise City are distributed nearly normally with mean 82 degrees and standard deviation 6 degrees F. Which of the following temperatures would be considered unusual? A. 89.2 B. 75.4 C. 79 D. 86.2 E. 95.8

Explain the difference between a physical property and a chemical property

What is the rule about how energy is transferred between two objects that are in contact?

What is the pressure in arm exerted by 2.48 miles of gas in 250.0 mL container at 58

How many Oxygen elements are in a carboxylic acid

The number of protons in the nucleus Of an Atom is equivalent to which of the following

What does pH measure? number of hydrogen atoms in an acid number of hydroxide atoms in a base concentration of hydrogen ions in solution concentration of hydroxide ions in solution

Based on charles's law, which of the following statements is true for an ideal has at a constant pressure and mole amount? A. The number of collisions is independent of volume B. The number of collisions decreases with increase in volume C.

50. mL of water is initially 70. k and cooled to 25. k. What is the thermal energy?