Science 6 7. Which is NOT a heterogeneous mixture?
a. fruit sald b. pencils and pens
c. marbles and pebbles d. vinegar

8. Why is a freshly squeezed orange juice called heterogeneous mixture?
a. no change can be observed
b. the components were completely dissolved
c. the components cannot be separated completely
d. the pulp component floats in a juice component

In a sample of oxygen gas at room temperature, the average kinetic energy of all the balls stays constant. which postulate of kinetic molecular theory best explains how this is possible? a. attractive forces between gas particles are negligible because the particles of an ideal gas are moving so quickly. b. collisions between gas particles are elastic; there is no net gain or loss of kinetic energy. c. gases consist of a large number of small particles, with a lot of space between the particles. d. gas particles are in constant, random motion, and higher kinetic energy means faster movement.

Explain why scientists use shared characteristics to make cladograms.

Which property of a rock remains unchanged by mechanical weathering? a. total surface area b. size and shape c. mineral composition d. sharpness