Chemistry Lab Exam
Terms
undefined, object
copy deck
- Intensive properties
- Properties that do not depend on the quantity of the sample.
- Extensive properties
- Properties that do depend on the quantity of the sample.
- Density
- The ratio of the mass of a substance to its volume. (D=M/V)
- Units used to express density of a liquid?
- grams per milliliter (g/mL)
- Units used to express density of a solid?
- grams per cubic centimeter (g/cm³)
- How do you find Volume if you have the Density & Mass?
- Mass / Density = Volume (M/D=V)
- How do you find the Mass if you have the Density and Volume?
- Volume * Density = Mass (V*D=M)
- What is used to measure mass?
- Balance or Mass Scale
- What is used to measure volume?
- Water displacement
- Physical Change
- A reversible change in the physical state of a substance, but not in it\'s chemical composition (Freezing & Boiling Water)
- Chemical Change
- An irreversible change in the chemical composition of a substance
- Examples of Physical Change
- Melting sand into glass, Melting butter
- Example of a Chemical Change
- Making a Hard-boiled egg
- Signs of a chemical change
- 1. Formation of a precipitate, 2. Color change, 3. Evolution of a gas, 4. Temperature change not caused by an external source
- Hydrates
- Solid ionic compounds containing weakly bound water molecules in their crystal structures.
- Water(s) of hydration
- the weakly bound water molecules found in the crystal structures of solid ionic compounds.
- Dehydration
- removing Water(s) of hydration from a hydrate
- Anhydrous
- the remaining form of a compound after complete dehydration of its water(s) of hydration.
- Formula for calculating percent water in a hydrate sample
- Percent Water % = Hydrate / (Hydrate + Anhydrous) convert decimal answer to percentage (move decimal space over 2 times right)
- Combination Reactions
- A+B > AB
- Empirical formula
- the simplest molar combining ratio of the elements in a compound.
- Decomposition Reaction
- AB > A + B
- Single Displacement Reaction
- A+BC > AC+B
- Double Displacement Reaction
- AB+CD > AD+CB