Heat on the move
Bonding and forces
Periodic Table Patterns
Inside the Atom
Names, Charges & Compounds
100
What type of heat transfer occurs through direct particle contact?
Conduction
100
What force holds oppositely charged ions together in an ionic bond?
Electrostatic force
100
What happens to atomic radius across a period from left to right?
Atomic radius decreases.
100
Which subatomic particle determines an element’s identity?
Protons
100
What charge does sodium form when it becomes an ion?
+1
200
Complete this sentence about convection currents: Hot fluid is _____ dense and _______; cool fluid is ______ dense and ______.
Hot fluid is less dense and rises; cool fluid is more dense and sinks.
200
Which is stronger? A covalent bond or an ionic bond? Why?
Ionic bonds due to electrostatic force.
200
Why do elements in the same group have similar properties?
They have the same number of valence electrons.
200
What happens to its charge when an oxygen atom gains two electrons?
O2- ion
200
How can you identify an ionic compound by its elements?
Ionic compounds contain a metal and a nonmetal.
300
A calorimeter is a device that measures heat changes and is insulated. That means that the total thermal energy in the calorimeter...
(Increases/Decreases/Remains the same/)
The total thermal energy remains the same.
300
N2 + O2 --> 2NO (and is formed during electrical storms).
Which bonds are broken in this reaction?
Bonds between nitrogen and oxygen
300
Which reacts more vigorously with water, calcium or magnesium?
Calcium, because it has a larger atomic radius and lower ionization energy. (easier to remove electrons)
300
What do the dots in a Lewis dot diagram represent?
Valence electrons
300
What is the charge of iron in Fe₂S₃
3+
400
What happens to blocks A and B after heat flow stops? Temperatures --> A is greater than B, B is greater than A, both blocks reach the same temperature
Both blocks reach the same temperature
400
Name the two compounds:
Fe3(PO4)
C2H4
Iron (I) phosphate
Dicarbon tetrahydride
400
Why does ionization energy decrease down a group? (Use shielding or nuclear attraction)
Increased electron shielding makes valence electrons easier to remove.
400
What does an atomic emission spectrum show about electrons?
Electrons exist in specific energy levels.
400
What is the charge of OH in Pb(OH)2
-1
500
What heat transfer process drives movement in the mantle? Where is the source of its heat?
Convection currents from the inner core
500
Which will have a greater melting point?
Na3PO4 or C2H4
Na3PO4
500
Order the following from smallest atomic radius to largest
Rb, Li, K, Na, Cs
Li, Na, K, Rb, Cs
500
What happens when an electron drops from a higher energy level to a lower energy level?
It emits energy in the form of heat and light
500
If an compound is not conductive as a solid, but is conductive when dissolved in water, it most likely is... (ionic/covalent)
Ionic