Are these exo/endothermic

1) combustion of gas in a car

2) water condensing on a mirror

3) boiling water

Predict the electronegativity of the undiscovered element with Z=119.

What is the fundamental unit or main building block of all living things?

Louis pasteur demonstrated that fermentation to produce alcohol is caused by

What can be removed from an atom if ionization energy is supplied? an electron a proton an ion a neutron

This is my last question! Look at the following hypothetical reaction: A+3B-->C+3D Assume that the equation is balanced. In which of the following reactant mole ratios will reactant B be the limiting reagent? a) A:4B b) A:5B c) 2A:7B d) A:B

What is released when a election returns to a lower state of energy

Which of the following elements has its highest energy electrons in an "s" atomic orbital? radiium (Ra) neon (Ne) aluminum (Al) lanthanum (La)

About how long does it take for the Sun to make one rotation on its axis?

Does a physical change affect the identity of a substance

If the cost of electricity is 8 cents/kWh, how much will it cost to use the light for a whole year (365 days) ?