Question

directions: decide if the change is chemical or physical. then color the space that matches pink: chemical blue: physical iron rusting, saltwater, chopping wood, oil and water, temperature change, bubbles forming, ice melting, folding paper, color change, food rotting, baking a cake, freezing, breaking an egg, fireworks, mixing salt and sand, burning fire, odor change, digesting food, cutting hair, breaking glass, cooking chicken, condensation

Explanation:

Step1: Recall chemical and physical change definitions

A chemical change results in a new substance being formed, while a physical change only affects the physical appearance or state of a substance without forming a new substance.

Step2: Analyze each change

• Iron Rusting: Chemical change as iron reacts with oxygen to form iron - oxide (rust), a new substance.
• Saltwater: Physical change as it is a mixture of salt and water with no new substance formed.
• Chopping Wood: Physical change as it only changes the shape and size of wood, no new substance.
• Oil and Water: Physical change as they are just mixed without a chemical reaction to form a new substance.
• Temperature Change: Physical change as it only affects the thermal state of a substance, no new substance.
• Bubbles Forming: Depends on context. If from boiling water, physical change (change of state). If from a chemical reaction like acid - base reaction, chemical change.
• Ice Melting: Physical change as it is a change of state from solid to liquid of water, no new substance.
• Folding Paper: Physical change as it only changes the shape of paper, no new substance.
• Color Change: Can be either. If due to a chemical reaction (like rusting), chemical change. If due to mixing non - reacting substances, physical change.
• Food Rotting: Chemical change as bacteria and other organisms break down food into new substances.
• Baking a Cake: Chemical change as ingredients undergo chemical reactions to form a new substance (cake).
• Freezing: Physical change as it is a change of state from liquid to solid, no new substance.
• Breaking an Egg: Physical change as it only changes the physical state of the egg, no new substance formed from a chemical reaction.
• Fireworks: Chemical change as explosives undergo chemical reactions to produce light, heat, and new substances.
• Mixing Salt and Sand: Physical change as they are just mixed without a chemical reaction to form a new substance.
• Burning Fire: Chemical change as fuel reacts with oxygen to produce heat, light, and new substances like carbon - dioxide and water vapor.
• Odor Change: Can be chemical as new substances are often produced in processes that cause an odor change.
• Digesting Food: Chemical change as food is broken down into new substances through chemical reactions in the body.
• Cutting Hair: Physical change as it only changes the length and shape of hair, no new substance.
• Breaking Glass: Physical change as it only changes the shape of glass, no new substance.
• Cooking Chicken: Chemical change as proteins and other components in chicken undergo chemical reactions.
• Condensation: Physical change as it is a change of state from gas to liquid, no new substance.

Answer:

• Chemical: Iron Rusting, Food Rotting, Baking a Cake, Fireworks, Burning Fire, Digesting Food, Cooking Chicken
• Physical: Saltwater, Chopping Wood, Oil and Water, Temperature Change, Ice Melting, Folding Paper, Freezing, Breaking an Egg, Mixing Salt and Sand, Cutting Hair, Breaking Glass, Condensation. Color Change and Bubbles Forming and Odor Change may be either depending on context.