How do you know when a chemical reaction has taken place?

What are 4 energy transfer

Whats the length of an aluminum rod at 65 c if its length at 15 c is 1.2 meters

What is the empirical formula for a molecule containing 46.8% Si and 53.2% O? A. Si2O3 B. Si2O C. SiO3 D. SiO2

How are the elements arranged in the current periodic table? O A. In order of increasing number of neutrons O B. In order of increasing number of electrons O C. In order of increasing atomic number O D. In order of increasing average atomic mass

Which of these equations correctly expresses the self-ionization of water? A) Upper H subscript 2 upper O superscript plus upper H subscript 3 upper O superscript plus double-headed arrow upper H subscript 2 upper O plus upper O upper H superscript

100 ml oxygen at 1.75 atm and 200ml nitrogen at 0.6 atm are passed to a 500 ml vessel. Calculate the total pressure of the mixture in the vessel at same temperature

Which is the best metal to use in an alloy to increase its electrical conductivity

Ice does not need to melt into liquid water before it can return to the atmosphere as water vapor. a. True b. False

How much ice at a temperature of - 17.5 ∘C must be dropped into the water so that the final temperature of the system will be 31.0 ∘C?

Why does a gas fill completely the vessel in which it is kept?