units 1,2
how many sig figs are displayed in this number? 0.00143 I
3
what is atomic mass?
an if protons and neutrons in a single term
when does an ionic compound occur?
an ionic compound occurs when a metal transfers its electrical to a non metal
what is the formula for density?
density = mass/volume
what tools are used to measure density? how?
graduated cylinder, displacement method
what number are electric configurations based off of?
atomic number
boron is a metal? true or false
false, boron is a metalloid.
what is dipole-dipole?
separation of opposite electrical charges.
what’s the difference between a chemical & a physical change?
physical is a change in a physical property (determined without changing the identity of the substance, ex. size, shape, color, density) chemical change is when 1 or more new substances is created.(determined by changing the identity of a substance, ex. water, acid, bases, heat, air)
what is iron?(metal, metalloid, or non-metal)
metal
london dispersion forces =strongest bond. true or false
false, weakest bonds
what is entropy?
a measure of DISORDER of a state or energy unavailable to do work. more entropy =more disorder
what is enthalpy?
amount of heat (energy) absorbed by the system to cause a change in the system, or the amount of heat expelled by the system gives off heat = - heat
what’s colombo's law?
attraction between oppositely charged particles.
what is the ionic compound name of NaCl
sodium chloride
percentage error=?
actual value-measure value/ actual valuex100.
what are the forms of matter?
solid, liquid, gas
if two protons are 0.10nm away from one electron, would you expect the force of attraction to be greater than or less than 2.30 x 10^-8N?
greater! the farther away, the weaker the force becomes, the more protons, the more force.
what is the goal of a lewis structure?
to draw a molecular compound, showing where the electrons are located.
who is democritus?
a greek philosopher who came up with the idea that matter was composed of tiny invisible particles called atom.