Choose the equation that represents an unbalanced neutralization reaction equation.

a) hbr + ca(oh)2 → cabr2 + h2o
b) so2 + h2o → h2so3
c) nacl + h2o → hcl + naoh
d) na + h2o → naoh + h2

How has the scientific community addressed the safety of chemicals? a. chemicals are repeatedly tested, even those that have existed for a long time. b. existing chemicals are tested if they have never been tested before. c. chemicals are tested if they are suspected to have caused a problem. d. only new chemicals are tested.

Design techniques and materials that reduce the negative environmental impact of a structure are referred to as

How is energy related to the change of state represented by the model? atoms gain energy as a solid changes to a liquid. atoms gain energy as a solid changes to a gas. atoms lose energy as a solid changes to a liquid. atoms lose energy as a solid changes to a gas.