Question

identify the physical and chemical changes around us.

it’s laundry day! you start by gathering up all the dirty clothes and dumping them into a laundry basket (1) ______ . next you take them downstairs and check to see if any have stains.

whenever you find a stain, you treat it with a clorox stain stick. the stains bubble and foam for a second and then the stain is gone (2) ______ !

first, you decide to wash your whites because you want to add some bleach. you know that bleach can help remove extra dirt and makes shirts whiter (3) ______ .

you also add laundry soap, to help break the dirt into little pieces and wash it away (4) ____ . once it is done washing, you put your clothes in the dryer, where the heat causes all the water to evaporate and dry your clothes (5) ____ .

as you pull your clothes out of the dryer, you notice a button is missing, so you sew it back on (6) ____ , fold your clothes (7) ____ and you are done with chores for the day!

Explanation:

Step1: Analyze (1) - Dumping clothes into basket

Physical change: No new substance is formed, just a change in location/arrangement of clothes.

Step2: Analyze (2) - Stain removal with Clorox

Chemical change: The Clorox reacts with the stain (a chemical reaction occurs, bubbles/foam indicate reaction), new substances are formed as the stain is removed.

Step3: Analyze (3) - Bleach action

Chemical change: Bleach chemically reacts with dirt and the fabric to whiten, new substances are formed (dirt is broken down chemically).

Step4: Analyze (4) - Laundry soap action

Chemical change: Soap chemically breaks down dirt into smaller pieces (a chemical reaction to emulsify dirt), new substances (or changed dirt) are formed.

Step5: Analyze (5) - Water evaporation in dryer

Physical change: Water changes from liquid to gas (evaporation), no new substance is formed, just a phase change.

Step6: Analyze (6) - Sewing a button

Physical change: No new substance is formed, just attaching a button (a physical manipulation).

Step7: Analyze (7) - Folding clothes

Physical change: No new substance is formed, just changing the shape/arrangement of clothes.

Answer:

(1) Physical Change
(2) Chemical Change
(3) Chemical Change
(4) Chemical Change
(5) Physical Change
(6) Physical Change
(7) Physical Change

(For each numbered action, identify as above. The key is whether a new substance is formed: physical changes don't form new substances, chemical changes do via reactions.)