Calculate the molality of c2h5oh in a water solution that is prepared by mixing 50. 0 ml of c2h5oh with 114. 1 ml of h2o at 20°c. The density of the c2h5oh is 0. 789 g/ml at 20°c. (assume the density of water at this temperature is 1. 00 g/ml. ).

Panthers and leopards prey on deer in an ecosystem. for unknown reasons, the population of leopards increased drastically. what are the likely effects of this change on the species? 1. more food for panthers and more competition for leopards 2. less food and more competition for panthers 3. fewer deer and more competition for panthers 4. more food for deer and less competition for panthers and leopards 5. more food for leopards and less competition for panthers

Luminous objects such as flashlights emit light that we can see. how do we see an object that isn’t luminous? a. the object emits light that reaches our eyes. b. light reflects off the object and reaches our eyes. c. light passes through the object uninterrupted. d. light is fully absorbed by the object. e. we can’t see an object that isn’t luminous.

To safely control the traffic flow and protect workers near public roadways and moving construction equipment use you could use