Atomic Structure
Periodic Table
Chemical Formulas
Physical / Chemical Properties
Riddles
100
What is the atomic number of this element: ++++++ 000000 -----
Atomic number = 6
100
How can a person tell which elements are SIMILAR to another element, using the periodic table?
Look at the elements in the same GROUP or FAMILY.
100
What is the chemical formula for water?
H2O
100
Physical or Chemical Change: Ice melting
Physical
100
I am the element in Group 15, Period 6.
Bismuth
200
What part of the atom determines its IDENTITY?
Atomic Number
200
This is the value on the Periodic Table that tells you the number of electron shells for each element:
The PERIOD number. (i.e. All elements in PERIOD 2 have TWO electron shells)
200
What would be the chemical formula for the following compound? 2 Hydrogens 1 Sulfur 4 Oxygen
H2SO4
200
When you chew, the particles of food are broken down before they are swallowed. How would you describe this kind of change?
Physical change Is the food changing into anything new at this point? NO! It just looks nasty!
200
I have 3 electron shells and 16 neutrons.
Phosphorous OR Sulfur
300
What is the overall charge of the atom below: + + + + + 0 0 0 0 0 - - - -
+ 1
300
What are the types of elements found on the staircase on the Periodic Table?
Metalloids
300
How many elements are in the following compound: C6H12O6
3 Carbon, Hydrogen, and Oxygen
300
Give an example of a CHEMICAL change related to digesting food:
Stomach acids dissolving food particles
300
I have 2 valence electrons and 12 protons.
Magnesium
400
What subatomic particles are found at the center of an atom? What is that part of the atom called?
Protons and Neutrons Nucleus
400
Where are the elements that are the MOST reactive found on the Periodic Table?
Group 1
400
How many atoms are there in the following compound: C4H6(OH)2
14 4 C 8 H 2 O
400
Name two of the four physical properties of METALS
Malleable Luster Conductor of heat and electricity Ductile
400
I am the only element without any neutrons.
Hydrogen
500
Put these items in order from GREATEST to LEAST mass: neutron, electron, atom, molecule
MOLECULE, ATOM, NEUTRON, ELECTRON
500
What element on the periodic table is found in all ORGANIC compounds?
CARBON (C) (i.e. CH4, C6H12O6, etc.) Look for the "ch" sound!
500
Which element is NOT balanced in this equation? C3H8 + O2 → 3CO2 + 4H2O
Oxygen (O)
500
List FOUR examples of evidence that a chemical reaction is taking place:
Color change Precipitate forms Bubble form (gas released) Temperature change (either hot or cold)
500
I am a Noble Gas with one electron shell.
Helium
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