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chem lab midterm
chem lab 100
| Question | Answer |
|---|---|
| Volume equation | final - initial |
| Definition of density | the amount of matter contained in a specific sized sample of that substance |
| Density equation | mass/ volume |
| Different substances have _______ densities. The density of a given substance will always be the _______. | different; same |
| Definition of mass | the amount of matter contained in a sample of a substance |
| mass is always measured in? | grams or a derivative of grams, (mg), (kg) |
| Definition of volume | the size of a sample of a substance |
| Volume is always measured in? | mL or a derivative such as L |
| 1 mL is equal to what? | 1 cubic cm 1 mL= 1 cm^3 |
| Equation for volume of a solid (cm^3 or mL) | length(cm) x width(cm) x height(cm) |
| What is a graduated cylinder? | a piece of glassware designed to measure volumes of a liquid |
| The curved surface of a liquid in a graduated cylinder is called what? | meniscus |
| Definition of solubility | the amount of a substance that can be dissolved in a specific amount of solvent |
| The degree of solubility of a substance in water depends on what? | temperature of the water and the chemical properties of the substance |
| Sand is ___________ in water. | completely insoluble |
| Benzoic acid is_________ in water. | slightly soluble |
| NaCl is __________ even in cold water. | quite soluble |
| Definition of decantation | a process of separating a solid residue (precipitate) from a liquid by gently pouring off the liquid without disturbing the solid that has settled to the bottom |
| Definition of filtration | a process of separating a solid from a liquid by using a filter through which the liquid, but not the solid, can pass |
| Vacuum filtration | suction may be used to draw the liquid through the filter |
| How does the temperature affect the solubility of salt in water? | solubility increases w temperature |
| Definition of tared | "zero-ed" on the weighing table |
| NaCl is more soluble at _______ temperatures that at _______ temperatures. | high; low |
| Sand is _________ in water at any temperature. | nonsoluble |
| What is the name of the piece of equipment used for vacuum filtration? | Buchner funnel |
| Benzoic acid dissolves in _______ water and creates crystals in _______ water. | hot; cold |
Created by:
yulissalira
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