Atoms and Molecules
What makes atoms of one element different from atoms of another element?
The number of protons in the nucleus.
Find Lithium on the Periodic Table. What is Lithium's atomic number?
3
The horizontal rows on the periodic table are called...
Periods
A change in matter in which new substances form is called...
A Chemical Change
A change in matter in which no new substances form is called a...
Physical Change
Atoms bond together (react) by gaining, losing, and sharing their...
Electrons
Find Neon on the Periodic Table. What is Neon's atomic mass?
20.180
The vertical columns on the periodic table are called...
Groups
What do we call the substances we end with after a chemical reaction?
Products
Is water boiling into steam a Physical Change or a Chemical Change? How do you know?
Physical Change - No new substances form. (Steam is still water, just the gas form of water)
Look at the picture: Are these atoms or molecules? Is this an element or a compound?
(See Pictures)
Find Phosphorus on the periodic table. How many Protons and Electrons are in an atom of Phosphorus?
15 protons, 15 electrons
Is element number 53 on the periodic table a metal, nonmetal, or semimetal?
Nonmetal
What is the law of conservation of matter?
No matter is created or destroyed in any physical or chemical change. (You have to start and end with the same amount of stuff)
Identify the Charge, Mass, and location in an atom of each of the following:
a) Protons
b) Neutrons
c) Electrons
a) Protons - Positive (+), Mass = 1 amu, located in the nucleus
b) Neutrons - Neutral (0), Mass = 1 amu, located in the nucleus
c) Electrons - Negative (-), Mass = 0 amu, locatedin orbits outside the nucleus (WAY outside)
How many TOTAL atoms are in 2H2O2?
8 total atoms (4 Hydrogen, 4 Oxygen)
Find Sodium on the Periodic Table. How many Neutrons are in an atom of Sodium?
12 Neutrons
Elements in the same group on the periodic table...
Have similar properties / react similarly in chemical reactions
Is the following Chemical Equation Balanced or Unbalanced?
Fe + CuCl2 -> Cu + FeCl2
Balanced
What are 5 potential signs / evidence that a chemical reaction has happened?
1) Color Change
2) Temperature Change
3) Bubbles (Gas Produced)
4) Precipitate (Solid Forms)
5) New Smell
How many Nitrogen atoms are in Pb(NO3)2?
2 Nitrogen atoms
Find Uranium on the periodic table. How many protons, neutrons, and electrons are in an atom of Uranium?
92 Protons, 146 Neutrons, 92 Electrons
Fin element #56 on the periodic table. What is its name? What group is it in? What period is it in? Is it a metal, nonmetal, or semimetal?
Barium: Group 2, Period 6, Metal
Balance the following Equation:
Zn + HCl -> ZnCl2 + H2
Zn + 2HCl -> ZnCl2 + H2
Draw a graph representing an Endothermic Reaction. Label the Reactants and the Products on your graph.
(See picture)