A student mixes two white solids in a beaker, which is sitting in a small pool of water on a block of wood.?

Question

Which statements is clearly an inference?
a) the temperature of the mixture drops.
b) Ammonia gas is released.
c) The mixture gets slushy
d) the beaker sticks to the wood

Answer 1

"A" is an inference. You did not directly measure the temperature of the material to determine if it dropped. You inferred it from your other observations.

B, C, and D can all be observed when this demonstration is done in front of the class, but A cannot be determined without using a thermometer to actually measure the temperature before and after the demo.

Answer 2

d