Chemical Reactions
What type of chemical reactions has to do with radioactive decay?
Nuclear reactions
Which of the following are chemical properties:
Boiling point
Reactivity
Color
Reactivity
What type of bond forms between two nonmetals
Covalent
Most elements on the periodic table are classified as what?
Metals
If pOH is 4.93, what is the pH? Is it an acid, base, or neutral?
pH=9.07
Base
Which of the following is an example of a synthesis reaction?
A) Water boiling into steam
B) Sodium and chlorine forming sodium chloride
C) Ice melting into water
D) Sugar dissolving in water
B) Sodium and chlorine forming sodium chloride
What is matter?
Anything that has mass and takes up space
What type of bond occurs in MgO?
Ionic
What are the horizontal and vertical rows on the periodic table called?
Horizontal: Periods
Vertical: Groups
Atoms with a different number of neutrons are called...?
Isotopes
Why do we balance chemical equations?
The law of conservation of mass. You need to have the same number of atoms before and after a chemical reaction since they are not created or destroyed.
What is the difference between a homogenous and heterogenous mixture?
Homogenous: parts are evenly combined in the substance (everything looks the same)
Heterogenous: parts of the substance are separate (you can see the different particles)
What is the name of the covalent compound C2H6?
Dicarbon hexahydride
What do periods and groups tell us about an element?
Periods: Energy Levels
Groups: Valence Electrons
What process joins small nuclei together to form larger ones?
Fussion
Balance the following chemical reaction
Al + HCl → AlCl3 + H2
2 Al + 6 HCl → 2 AlCl3 + 3 H2
What's the difference between an element and a compound?
Element: made of 1 type of atom (Oxygen)
Compound: made of 2 or more different types of atoms (CO2)
What does the octet rule state?
Atoms are more stable when their outermost energy level is full; therefore, atoms make bond or become ions to have a complete outer energy shell of 8 electrons (and sometimes 2).
What is the most reactive group on the periodic table called?
Alkali Metals
If you start with 100 grams of a radioactive isotope and 2 half-lives pass, how many grams remain?
25 grams
Name the 5 types of chemical reactions we discussed in class.
Synthesis Reaction
Decomposition Reaction
Single Displacement Reaction
Double Displacement Reaction
Combustion Reaction
What makes sublimation and deposition unique?
They both skip the liquid phase in their phase change.
Sublimation: Solid to gas (dry ice to CO2)
Deposition: Gas to solid (water vapor to frost)
Write the formula for the ionic compound: Magnesium phosphide
Mg3P2
What makes up atomic numbers? What makes up atomic mass?
Atomic Number: Number of protons
Atomic Mass: Protons & Neutrons
If you have a substance with an OH- concentration of 3.8x10-6 , what is the pOH and pH of the solution? (round your answers to 2 places after the decimal)
Is it an acid, base, or neutral?
pOH=5.42
pH=8.58
Base