Chem 170 chapter 1 Flashcards
A chemist mixes sodium with water and witnesses a violent reaction between the metal and water, this is classified as…
a) observation
b) a law
c) a hypothesis
d) a theory
a) Observation
2 different elements attached to each other are called
A compound
A single element is called
a pure element
Gasoline evaporating is an example of
physical change
wood burning is an example of
chemical change
convert 85 degrees F to Kelvin
302.6 K
f-32/1.8 = C
C + 273.5 = K
33.2x10^-4 m to mm
33.2mm
Match the values mega (M) = ? Kilo (K) = ? deka (da) = ? deci (d) = ? centi (c) = ? milli (m) = ? micro (u) = ? nana (n) = ? pico (p) = ?
mega (M) = 10^6 Kilo (K) = 10^3 deka (da) = 10^1 deci (d) = 10^-1 centi (c) = 10^-2 milli (m) = 10^-3 micro (u) = 10^-6 nana (n) = 10^-9 pico (p) = 10^-12
What is the mass of 1.75 L sample of liquid that has a density of 0.921 g/ml
1.61 x10^3g
Mass = Density * Volume
sigfig rules
Rule 1: Non-zero digits are always significant.
Rule 2: Any zeros between two significant digits are significant.
Rule 3: A final zero or trailing zeros in the decimal portion ONLY are significant.
Exact numbers are
Whole numbers without decimals
1285 cm^2 to m^2
.1285m^2
1m = ? cm 1m^2 = ? cm^2 1m^3 = ? cm^3
1m = 100 cm 1m^2 = 10000 cm^2 1m^3 = 1000000 cm^3
Formulas for Mass, Density, and Volume
Mass = ?
Density = ?
Volume = ?
Mass = Density * Volume Density = Mass / Volume Volume = Mass / Density