Highlights Flashcards
When unlike atoms are bound together chemically, they form a_______?
Molecular compound
2 atoms hydrogen and 1 atom of oxygen forms?
The compound of water
When two different elements or compounds are mixed together and the molecules do not combine chemically, the substance is known as a _________.
Mixture
The symbol of gold?
Au
Atomic weight of gold?
197
Specific gravity of gold?
19.32 @ 17.5^0 Celsius
When like atoms are bound together chemically, they form an?
Element
The smallest division which can be made in a substance and still retain all the properties of the substance.
A molecule
What two things determine the state of matter?
Temperature and pressure
When heated molecular speed is?
Increased
Formulas for converting Fahrenheit to Celsius and Celsius to Fahrenheit.
C=5/9 (f-32)
F=9/5 c+32
The temperature at which molecular motion ceases?
Absolute zero (-460 degrees Fahrenheit)
Density formula
What a closed space from which all gasses have been removed?
A vacuum
Viscosity is?
The resistance of fluid flow—-varies with different kinds of fluid and fluid temperature
What are the two kinds of energy?
Potential-due to the position of mass
Kinetic-due to motion of mass
The rate at which work is done?
Power
What are the two kinds of velocity?
-constant
-variable
What is a water hammer?
Force or shock which results when movement of a confined liquid is suddenly arrested or accelerated?
Define work
Force x distance the overcoming of resistance
Define potential energy
Stored energy
Define kinetic energy
Energy which a body possesses in virtue of being in motion
Define friction
Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other
What are the four functions of gears?
-transmit positive motion
Change direction
-change speed
-increase or decrease force
With an odd number of gears in. Simple gear train, the driver and driven gears rotate in the _____ direction. An even number of gears produces a _____in direction.
Same;change
What is the effort distance on an inclined plane?
The slope
What 4 things are screw threads used for?
-transmit motion
-apply tremendous forces with little effort
-hold parts together
-obtain measurements
Most screw heads are said to have a _____ number of threads per inch.
Definite
Ratio for gear teeth
