Temperature
measures how hot or cold an object is compared to another object
flows from a higher temp to a lower temp
Do exact numbers matter in the terms of determining how many sig figs to use?
since they are always the same and exact it won't change, so they don't factor into significant figure use
what is the equation for heat energy and specific heat?
q = mcΔT
What is the difference between a compound and a mixture?
a compound is always the same ratio and composition, ex. water
a mixture can have many different elements or compounds and can have varying proportions, ex. lemonade or coffee
What is the difference between a physical and chemical change of properties or matter?
What are the two equations used to convert between temperature scales?
Tf = 1.8(Tc) + 32
Tk = Tc + 273.15
How many of the answers have 4 significant figures?
5746, 6750, 6000, 745.0, 62.00x10^3, 74.32
4
What does specific heat mean and what is the heat energy equation used for?
specific heat - the amount of heat that is required to raise the temp of exactly 1 g of a substance by exactly 1oC.
The heat energy equation is used to describe the amount of energy it would take to raise the temp of a certain substance based on how much of it there is
Identify the following as either a compound, element of mixture:
water, air, salt and water, Po, glucose, carbon dioxide, & I2
compound, mixture, mixture, element, compound, compound, element
What is the difference between vaporization and condensation?
and which one adds heat and one releases heat
vaporization is turning a liquid into a gas and condensation is bringing it back to a liquid
vaporization absorbs heat and condensation releases heat
What is the boiling point in Celsius?
A doctor's order prescribed a dosage of 0.450 mg of a drug. If a tablet contains 75 micrograms of the drug, how many tablets are required to prescribe the medication?
6.0 tablets (with sig figs)
micrograms = 103 = 1 milligram
what change in temperature is needed for a given metal of 32.4 grams that absorbs 374 J of heat that has a specific heat capacity of 0.243 J/g oC?
A change in temperature of 47.5oC?
Which of the following is not a physical property of matter?
boiling point, melting point, physical state, shape, interacting with other substances, density, color
interacting with other substances - essentially creating new compounds
If 400. g of ice is placed in a bag, how much heat in, kilojoules will be released when the ice melts?
334 J = 1 g of ice
133600 J or 133.6 kJ
with sig figs, 134 kJ
What is the conversion of 1400 kg to femtogram?
1 kg = 1.0x1018 femtogram
1.4 x 1019 femtogram
dental implants use titanium (Ti) because it is strong, nontoxic, and can fuse to bone. Titanium has a specific heat of 0.125 cal/g oC. How many grams are needed to raise the temp from 36.0oC to 41.3oC, with q being 11 calories?
16 grams of titanium
What is the difference between evaporation and boiling point?
Evaporation = conversion between states of matter only happens at the surface
boiling - conversion between states of matter happens everywhere
diagonal lines - indicated changes in temperatures at one state
horizontal lines - changes of state, solid to liquid, etc