If we read the reaction as x + y → z + q it is
a. endothermic
b. exothermic

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

For each of the following types of reactions, write a general reaction formula in the symbolic form—for example, a + b → ab. single-displacement double-displacement synthesis decomposition

Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. which is a logical conclusion about these electromagnetic waves? their energy must be very their frequency must be very low these waves can travel without a medium they only travel through a vacuum of space