day 3 week 1

#1 ISBS 


1. A physical property is a property that can be observed and measure without changing the chemical makeup of the substance. 


2. Three physical properties of water are density, melting point, and freezing point.


3. Solid water is less dense than liquid water. 


4. A lake is a setting where all three physical properties of water are observed. In it's solid state, a lake would be covered with a layer of ice. In it's gaseous state, the water would evaporate. In it's liquid state, a lake's water would remain liquid. 


5. Heterogeneous and homogeneous mixtures are different because a heterogeneous mixture is not the same throughout, whereas a homogeneous mixture is the same throughout. 


6. In order for liquid to be on top of a gasoline/liquid mixture, you would need to know the density of that liquid. 


7. a-  suspension b- suspension c- solution d- solution e- solution f- colloid 


8. The air in the room would be a colloid because it exhibits the Tyndall effect. 


9.

10. This mixture would be a suspension because the solid particles are large enough to shift to the bottom over time. 


11. A substance is an element or compound that has a uniform and definite composition. Two examples are water and salt. 


12. a- CO is a compound  b- Co is a compound  c- HCI is a compound  d- Mg is a compound   e- NaHCO3 is a compound  f- I2 is an element