Chapter 3, Lesson 1 Multimedia
Aluminum and Copper
- Copper atoms are smaller than aluminum atoms.
- More copper atoms can fit in the cube.
- Copper atoms are also heavier than aluminum atoms.
- The combination of more and heavier atoms makes copper more dense than aluminum.
- Volume is a measure of the amount of space an object takes up. It is always in three dimensions. To find the volume of an objects like a cube or a box, measure the length × width × height. If measured in centimeters, the answer will be in cubic centimeters (cm3).
- Mass is measured in grams.
- The units for density will be g/cm3.
- Arrangement of atoms in different metals is similar.
- Individual atoms are packed very close together.
- Therefore, differences in density between metals are usually based on the size and mass of the atoms.
- Most plastics are made from chains of carbon and hydrogen atoms connected together.
- Molecules in plastics can have: different length chains, twisted, tangled, or layered chains, different atoms or molecules connected to the C–H chain.
- If the different atoms are heavy atoms, the plastic tends to be more dense, if they are light atoms, the plastic tends to be less dense.
- Wood is made from a long molecule called cellulose.
- Cellulose is made from glucose molecules connected together in long chains.
- Glucose is made from carbon, hydrogen, and oxygen atoms.
- The structure of wood is made of many cellulose molecules stacked together. Plastic and wood can have similar densities because they are made from similar atoms and are both composed of long chains. The main difference is how closely packed the chains are to one another.
- Lesson 1: Water is a Polar Molecule
- Lesson 2: Surface Tension
- Lesson 3: Why Does Water Dissolve Salt?
- Lesson 4: Why Does Water Dissolve Sugar?
- Lesson 5: Using Dissolving to Identify an Unknown
- Lesson 6: Does Temperature Affect Dissolving?
- Lesson 7: Can Liquids Dissolve in Water?
- Lesson 8: Can Gases Dissolve in Water?
- Lesson 9: Temperature Changes Dissolving
- Lesson 1: What is a Chemical Reaction?
- Lesson 2: Controlling the Amount of Products in a Chemical Reaction
- Lesson 3: Forming a Precipitate
- Lesson 4: Temperature and the Rate of a Chemical Reaction
- Lesson 5: A Catalyst and the Rate of Reaction
- Lesson 7: Energy Changes in Chemical Reactions
- Lesson 8: pH and Color Change
- Lesson 9: Neutralizing Acids and Bases
- Lesson 10: Carbon Dioxide Can Make a Solution Acidic