Which is a homogenous mixture:
a. apple
b. water
c. sand
sand
100
Order these units from smallest to largest.
mg, kg, cg, dg
mg cg dg kg
100
Write the symbol of the atom with 16 protons, 16 neutrons and 16 electrons.
16 32 S
100
Electron configuration for F.
1s2 2s2 2p 5
100
Name three elements in the halogen.
F, Cl, Br, I At
200
What is the mass of an object that has a density of 13 g/mL and a volume of 10 ml?
130 g
200
write 456.00 in scientific notation
4.5600 X 10 2
200
Pick the three elements that fall in the same group.
O C Te Na S
O S Te
200
How many orbitals in the p shape?
3
200
Which of the following is not a transition metal?
copper iron vanadium calcium
300
Three possible observations that a chemical reaction has occurred.
gas formation, odor, temperature change, color change
300
Round the following to 3 significant figures
549.963
550.
300
Element X - 203 has a 90% abundance
Element X - 205 has a 10% abundance
The weighted average mass will be closer to ______
203
300
Who developed the Plum Puddin Model
JJ Thomson
300
Which has the highest electronegativity number?
C F Li Cs
F
400
Four ways to separate a mixture.
filtration, physically, evaporation, distillation
400
Report the answer in correct significant figures:
8.7 + 15.43 + 19 =
43
400
protons + neutrons =
atomic mass
400
What is the Energy if frequency of light is 3 X 10 8?
h = 6.6 E -34
1.98 E -25
400
Why does the ionization energy increase going from left to right on a period.
The atomic radius gets smaller and nuclear charge is larger
500
The state of matter that has a definite volume but indefinite shape.
liquid
500
What is the mass of a cube of Al that is 3.0 cm with a density of 2.7 g/cm 3?
73 g
500
John Dalton's Four Points
elements made of indivisible atoms
atoms of an element are similar
compounds are made up of atoms
chemical reactions are a rearrangement of elements but no new elements are formed.