The symbol ∆ in a chemical equation means:

precipitate.

heat is supplied to the reaction.

a catalyst is needed.

yields.

What are the function of manganese dioxide in a dry cell

Which process is the most important for cloud formation? A. cooling by contact with a cold surface B. cooling by compression of air C. cooling by expansion of air D. cooling by radiation from Earth's surface

To what class of minerals do gold, silver, and copper belong? A. carbonates B. native elements C. halides D. sulfates and sulfides

HI (g) + CH3I (g) - > CH4 (g) + I2 (g) the rate constant is 0.28 L/Mol*s at 300*C and 0.0039 L/Mol*s at 227*C. a) What is the Activation energy of this reaction. b) What is k at 400*C

Which phenomena support only the wave theory of light? reflection refraction diffraction interference photoelectric effect

In the ground state, has only 1 electron in a p orbital. A. carbon B. fluorine C. hydrogen D. nitrogen E. aluminum

Which of the following is a mixture? alcohol water mercury ink

A gas occupies 3.5 L at standard pressure. Find the volume of the gas when the pressure is 1.5 atm.

What is the temperature (in K) of 16.45 moles of methane gas in a 4.95 L container at 4.68 atm?

What do we call the process by which cells obtain the energy that they need?