Calculate the heat required to head 250 grams of water from 21 C to 53 C. The specific heat capacity of water is 4.18 J/g C.
Use the equation - Q=mC(Temp Final - Temp Initial)
33,440 J
25
What is sublimation?
solid to a gas
5
What is deposition?
Gas to a solid
5
Heat flows in what direction?
high to low
10
List 3 chemical changes
Rotting
Burning
Rusting
15
List 3 physical properties.
List 3 chemical properties.
Physical Properties: Color, Mass, Boiling Point
Chemical Properties: Ability to Rust, Reactivity, Flammability
25
Define isotope.
atoms with a different number of neutrons and different mass
15
Define ion.
atoms with a different number of electrons - have a positive or negative charge
15
If an atom has 20 protons, 20 electrons, and 21 neutrons, what is the mass number? What is the element?
Mass number - 41
Element/Atomic number - Calcium
20
This is a Bohr diagram for what element? How many protons, neutrons, electrons, and valence electrons does it have?