What devices are used to measure mass, volume, density, and weight?
Triple-Beam balance & scale
mass divided by weight
graduated cylinder
beaker
volume over mass
mass over volume
For the pendulum experiment what were the Independent and dependent variables?
Mass, period
Weight, size
Time, force
Scientific theory is what scientists predict to happen in the future.
How many significant figures are in 0.57?
2
3
4
1
Using sig figs, how would you solve 26.9 divided by 3?
.9
9
900
.009
Percent error is: predicted-true value ------------------------------ true value
Protons add amu to the atom. Neutrons add amu to the atom. Electrons add mass to the overall atom.
Properties of metalloids include-
brittle
somewhat reactive
hard
soft
unbreakable
luster
What is the last part of the brain to develop?
frontal cortex
pre-frontel cortex
dark matter
white matter
Three methods used to avoid animal-testing?
in vitro testing
computer modeling
volunteer
insect testing
solutions contain a solvent dissolved in a solute
molecular compounds in water conduct electric current
a characteristic property of a solution is that it can scatter light
brass is a solid dissolved in a solid
shows the ratio of atoms in a compound
chemical formula
element
mixture
Dalton thought the atom was a condense sphere
...thought the atom was like a watermelon (scattered electrons)
thomson
bohr
rutherford
dalton
Rutherford said the atom was like....
empty space with a positive core
a cloud of electrons
electrons surrounding a nucleus of protons and neutrons
Bohr said the atom had a nucleus filled with protons and neutrons with electrons orbiting around the entire nucleus
