Question

construct an explanation density is the mass of given volume. materials that are less dense float on denser materials. use the molecular models of water vapor, water, and ice with the photograph of the glacier to explain why ice floats on water. (look closely at the models!) 2. a 4th state of matter is called plasma. research plasma using the internet and list 4 properties of plasma. how are plasma different from gases? in the firework display phenomenon, do you think the matter in the colorful display is in solid, liquid, gas or plasma state? explain your reasoning.

Explanation:

1. Why ice floats on water

Ice has a lower density than liquid water. Water molecules in ice form a hexagonal - lattice structure due to hydrogen - bonding. This structure creates more empty space between the molecules compared to the more closely - packed arrangement in liquid water. So, for the same volume, ice has less mass and thus lower density, allowing it to float on water.

2. Properties of plasma

• Conductivity: Plasma is a good electrical conductor because it contains free electrons and ions.
• Response to magnetic fields: It can be influenced and shaped by magnetic fields due to the charged particles it contains.
• High energy state: Plasma exists at high temperatures or in the presence of high - energy sources, which ionize the gas.
• Luminescence: Many plasmas emit light, for example, the plasma in neon signs or in the Sun's corona.

3. Difference between plasma and gases

Gases consist of neutral atoms or molecules, while plasma is an ionized gas containing a significant number of free electrons and ions. Gases do not conduct electricity well under normal conditions, whereas plasma is a good electrical conductor. Also, gases are not affected by magnetic fields in the same way as plasma; plasma can be manipulated by magnetic fields due to its charged - particle nature.

4. State of matter in fireworks

The matter in a colorful fireworks display is in the plasma state. Fireworks involve high - temperature reactions that ionize the gases and metal salts present in the fireworks. The high energy causes electrons to be excited and then de - excited, emitting light of different colors. The presence of ionized particles and the high - temperature environment are characteristic of the plasma state.

Answer:

1. Ice floats on water because it has a lower density due to its molecular structure.
2. Four properties of plasma: conductivity, response to magnetic fields, high energy state, luminescence.
3. Plasma is different from gases as it contains charged particles (ions and electrons), conducts electricity well, and is affected by magnetic fields.
4. The matter in a fireworks display is in the plasma state due to high - temperature ionization and light - emitting reactions.