Pure vs Mixture
Atoms vs Molecules
States of Matter
Phase Changes
Element Types 1
Element Types 2
Subatomic Particles
density
Bohr and Valence
100
Classify this sample as a mixture or pure substance.
mixture
100
What is in this sample: atoms, molecules, or atoms and molecules?
atoms
100
What type of state of matter is in each image?
A
B
A liquid
B solid
50 points for each answer
100
What's a word that describes these phase changes (aka state of matter change):
a. solid to gas
b. gas to solid
c. liquid to solid
a. sublimation
b. deposition
c. freezing or solidification
25 points per question + 25 points for answering all 3
100
Which of these is a metalloid?
a. manganese
b. magnesium
c. astatine
e. bromine
c, astatine
100
Groups are ______, periods are _____.
groups are vertical, periods are horizontal
100
What are the charges of each subatomic particle?
protons +, electron -, neutrons neutral (zero charge)
100
What does density measure or quantify?
how compact a substance is, or how many particles are in an amount of volume
100
What are valence electrons?
The electrons located farthest away from the nucleus
200
What type of mixture is this sample: heterogeneous or homogeneous?
since uniformly mixed, homogeneous
200
What is in this sample: atoms, molecules, atoms and molecules?
molecules
200
Which state of matter has the fastest moving particles?
gas
200
Is this sample being heated or cooled?
starts at high T at (0,y) and ends up at low T at (x,0) so cooling
200
Is hydrogen a metal, nonmetal, or metalloid?
nonmetal
200
What element is in group 4, period 5?
zirconium
200
How many protons in one atom of iridium?
77
200
Magnesium has a density of 1.738 g/mL. Would it float or sink in water?
sink, according to the density
200
In a Bohr model for sulfur, how many electrons in each ring?
1st ring 2 electrons
2nd ring 8 electrons
3rd ring 6 electrons
300
What type of mixture is this sample: heterogeneous or homogeneous?
Since there are distinct layers (aka NOT uniformly mixed), heterogeneous
300
Are the molecules in this sample are an element or a compound?
compound
300
Which state (or states) of matter can be compressed?
only gases
300
This is a heating curve for a metal. What is the melting point temperature for this metal?
at the first plateau, approximately 1500 degrees C
300
Which type of material is shiny, flexible, and good at conducting heat and electricity?
a. nonmetals
b. metals
c. metalloids
b, metals
300
Which of these elements are NOT diatomic? May be more than one answer.
hydrogen, calcium, chlorine, carbon
calcium and carbon
150 points per answer
300
How many neutrons in one atom of radium?
138
300
An object has a mass of 65.42 g and a volume of 89.14 mL. What is the density?
density = mass/volume
300
How many valence electrons in one atom of bismuth?
5
400
True or false: this sample is a pure substance
All the molecules in the sample are the same (one red + one yellow), so pure substance
400
Are the molecules in this sample elements or compounds?
elements
400
Which state (or states) of matter have a set volume (meaning it's the same volume no matter what container it's in) but a flexible shape?
liquids
400
What is the triple point of carbon dioxide?
point D, or 216.6 K and 5.2 atm
400
Which of these materials would you expect to be brittle, matte (aka not shiny), and a good insulator against heat and electricity?
a. selenium
b. tellurium
c. polonium
d. chromium
a, selenium (nonmetal)
400
What specialty group is lead in?
post transition metals
400
What keeps electrons in the atom?
What keeps protons in the atom?
electrons: attraction to protons
protons: the strong force
200 points per question
400
A rectangular object has a mass of 65.23 grams. It has a length of 12.45 cm, a width of 2.25 cm, and a height of 17.50 mm.
Calculate the density. Hint: change the mm to cm before moving on.
Report answer with correct units and sig figs.
1.23 g/(cm^3)
400 points for all correct
300 points for either sig figs or units wrong
200 points for sig figs and units both wrong
400
Which neutral atom is shown in this partially redacted Bohr model?
argon
500
Is this a pure substance or a mixture?
Since it lists one item (sodium bicarbonate) 100%, this is a pure substance
500
Are these molecules an element or a compound?
a. nitrogen, N2
b. calcium chloride, CaCl2
c. ammonia, NH3
a. element
b. compound
c. compound
all right = 500 points
2 right = 250 points
1 right = 100 points
500
Which state of matter has the most amount of interactions (NOT bonds) between the particles to keep a set _____ and a set ______?
solids, volume, shape (the last two could be in either order)
500
A sample of carbon dioxide starts off at 300 K and 1 atm. It is heated up to 305 K and 73 atm. What state of matter describes the carbon dioxide at the second pressure and temperature?
supercritical fluid
500
Which material may be either shiny or matte, flexible or brittle, and is a semiconductor?
a. mercury
b. titanium
c. germanium
d. iodine
c, germanium
500
Identify these elements:
a. alkali metal in period 2
b. halogen in period 4
c. last element in the lanthanide row
a. lithium
b. bromine
c. lutetium
3 right = 500 points
2 right = 250 points
1 right = 100 points
500
How many of each subatomic particles in one neutral atom of:
a. curium
b. tungsten
c. the metalloid in period 2
d. the halogen in period 5
a. 96 protons, 96 electrons, 151 for curium
b. 74 protons, 74 electrons, 10 neutrons
c. boron 5 protons, 5 electrons, 6 neutrons
d. iodine 53 protons, 53 electrons, 74 neutrons
125 points for each answer (all or nothing on the subatomic particle numbers)
500
Magnesium has a density of 1.738 g/mL.
The volume of a sample of magnesium was measured by water displacement. The initial water volume was 20.00 mL. The final water volume was 28.40 mL.
a. What was the volume of the magnesium sample?
b. What was the mass of the magnesium sample?
Report answer with correct units and sig figs.
a. 8.40 mL
b. 14.60 grams
250 for each question. For each one, sig figs and units are both with 75 points.
500
Hard level
What element is this? It has 31 neutrons.
nickel, Ni