Two chemical reactions are shown: 2Mg + O2 → 2MgO
CaCO3 → CaO + CO2

Which statement is true?

A. Both are synthesis reactions.
B. Both are decomposition reactions.
C. A is a synthesis reaction, and B is a decomposition reaction.
D. A is a decomposition reaction, and B is a synthesis reaction.

It takes 945.kj/mol to break a nitrogen-nitrogen triple bond. calculate the maximum wavelength of light for which a nitrogen-nitrogen triple bond could be broken by absorbing a single photon.

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

You open a can of soda at room temperature and hear a hiss. which of the following factors has changed inside the container? a.) atmospheric pressure b.) temperature of gas c.) type of gas d.) amount of gas