Matter Review Worksheet
| # | Answer |
|---|---|
| 1 | Matter is anything that has mass and occupies space. |
| 2 | Density = mass ÷ volume = 27 g ÷ 10 cm³ = 2.7 g/cm³. |
| 3 | Oxygen gas: element; water: compound; saltwater: mixture. |
| 4 | The wood is less dense than water. |
| 5 | A physical change changes form or state without creating a new substance, such as melting ice. A chemical change forms one or more new substances, such as rusting iron. |
| 6 | The volume decreased by a factor of 4. |
| 7 | As temperature increases, particles move faster and usually spread farther apart, causing expansion. |
| 8 | Density = 540 g ÷ 60 cm³ = 9.0 g/cm³. It would sink in water because its density is greater than 1.0 g/cm³. |
| 9 | Particles gain energy, move more freely, and become less tightly packed while still remaining close together. |
| 10 | The pressure increases because gas particles move faster and collide more often and more forcefully with the container walls. |
| 11 | In solids, particles are tightly packed and vibrate in fixed positions. In liquids, particles are close together but can move past one another. In gases, particles are far apart and move rapidly in all directions. |
| 12 | Volume = mass ÷ density = 125 g ÷ 0.80 g/mL = 156.25 mL, which is about 156 mL. |
| 13 | No. Mixtures can be homogeneous or heterogeneous. Homogeneous mixtures are uniform throughout, while heterogeneous mixtures are not. |
| 14 | Mass = moles × molar mass = 3.0 mol × 44 g/mol = 132 g. |
| 15 | The pressure increases to three times its original value. With less volume, particles hit the container walls more frequently, so pressure rises. |