PRE-LAB ASSIGNMENT: Practice Calculations
Use the data provided to complete the following calculations in your lab notebook:
DATAI:
Mass of empty crucible
22.498
Mass of crucible + hydrate 26.70 g
(before heating)
Mass of crucible + anhydrous salt 25.82 g
(after first heating)
Mass of crucible + anhydrous salt 25.81 g
(after second heating)
a. Determine the mass of hydrate used.
Mass of hydrate - (Mass of crucible + hydrate before heating) - (Mass of empty crucible)
b. Determine the mass of anhydrous salt.
Mass of anhydrous salt - (Mass of crucible + anhydrous salt after final heating) - (Mass of empty
crucible)
c. Determine the mass of water.
Mass of water - (Mass of hydrate)- (Mass of anhydrous salt)
d. Determine the percentage of water in the hydrate.
% water - Mass of water x 100
Mass of hydrate

nanotechnology is a powerful tool in biomaterials research as it creates numerous possibilities for the engineering of functional molecules. nano-bio refers to projected ability to incorporate biomimicry into various materials at nanoscale.  

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance

a is the answer to this question

explanation:

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation: