Barb tests the properties of three minerals and makes a data table to record her results, as shown below. PHYSICAL PROPERTIES OF
THREE MINERALS
Property 1 Property 2
Talc white not shiny
Graphite black shiny
Quartz none not shiny
Which two properties did Barb test?
streak and luster
streak and cleavage
mineral size and luster
hardness and mineral type

Americium-241 undergoes fission to produce three neutrons per fission event. if a neutron-absorbing material is mixed in with this sample so that the rate of neutron production drops down to 1.8 neutrons per fission event, which will be effective at achieving a critical mass? check all that apply. remove a deflective shield surrounding the sample. remove absorbent material mixed in with the sample. compress the sample of americium-241.

Aperfume bottle is dropped in the corner of a room. the odor of the perfume can be detected on the other side of the room. which statement best describes this observation?

If 15 drops of ethanol from a medical dropper weight 0.60g, how many drops does it takes from a dropper to dispense 1.0ml of ethanol? the density of ethanol is 0.80g/ml