Classifying Matter
are there any special cases when classifying matter by particle structure?
yes, water has special properties that affect its classification of matter
a beaker holds 3 samples of salt, each weighing 5g, what is the total mass of salt?
15g of salt
algebra:
2x+4=17 what is x?
what is 6.5?
when are the new modules posted?
Thursdays (mornings)
how many significant figures are in 1.30 x 102? (standard scientific notation)
3, why?
what state of matter is perfume?
it depends! perfume can be liquid inside the bottle but gas once sprayed into the air
simplify (1/2)3
0.125 or 1/8
quadratic expressions:
2x2 - 8x + 6 = y
what is y when x=3?
y = 0
when are your ALEKS homework assignments due?
Wednesdays at 11:59pm
how many significant figures are in 0.0934g?
3
as the temperature of solid water increases, what happens to the volume of the sample?
the volume of the sample decreases, the individual molecules move closer together than they were in the initial solid state
how many kilograms are in 2.5g of H2 (hydrogen gas)?
.0025kg
quotient rules:
(2.0 x 103) x (1.0 x 104)
20,000,000 can anyone say what this is in scientific notation?
what's due tomorrow?
Gradescope practice problems assignment at 11:59pm
how many significant figures would be in the FINAL answer to this problem?
(1.2+3.45)/2.5
2
does temperature have an effect on physical state? give an example
temperature affects all states of matter, increasing the temperature of a substance increases particle speed
a constant -12°C temperature change occurs every 3 minutes, what is this rate of change? (how about for every 6 minutes?)
-4°C per minute
-24°C per minute
(x)g A + 4g B = 17g, what is the mass of A in mg?
0.013mg of A
what modules will the midterm cover?
modules 1-3
does pressure have an effect on physical state? give an example
pressure only affects the liquid and gaseous states of matter. high pressures can decrease the volume of a gas, high pressure can affect physical properties of liquids
ex. if under enough pressure liquid can be compressed enough it will be forced to solidify
simplify 4ab/16bc
1a/4c
a temperature change in a reaction is about -3/2°C per minute, what is the total change in temperature after 4 minutes?
-6°C
when and where is the midterm? (must answer both)
November 10th at 5:30pm in Klein 104