part c
in this section, you will work with a partner. you and your partner will be given a stack of cards where you will organize the cards into the categories of physical and chemical change. write physical and chemical change for the scenarios in the table below.

| description | physical and chemical change (we will assume all chemical changes are also physical changes) |
|--|--|
| using a flashlight | |
| boiling water | |
| hydrochloric acid reacts with potassium hydroxide to produce a salt, water, and heat | |
| burning wood | |
| water is heated until it begins to boil and produces steam | |
| a soft piece of pure sodium metal is sliced in half | |
| the compound kclo3 decomposes (breaks down) into kcl solid and o2 gas | |
| dry ice, frozen solid co2 sublimes directly to co2 gas. | |
| a plant photosynthesizes sunlight and co2 to produce glucose and o2 | |
| iron metal is oxidized by oxygen gas to produce fe2o3 seen as rust on an old iron nail | |
| the lactose sugar in milk is converted to lactic acid by bacteria | |
| a piece of paper is folded in half | |
| droplets of water condense on the outside of cold glass of water on a hot summer day | |

Question

part c
in this section, you will work with a partner. you and your partner will be given a stack of cards where you will organize the cards into the categories of physical and chemical change. write physical and chemical change for the scenarios in the table below.

| description | physical and chemical change (we will assume all chemical changes are also physical changes) |
|--|--|
| using a flashlight |  |
| boiling water |  |
| hydrochloric acid reacts with potassium hydroxide to produce a salt, water, and heat |  |
| burning wood |  |
| water is heated until it begins to boil and produces steam |  |
| a soft piece of pure sodium metal is sliced in half |  |
| the compound kclo3 decomposes (breaks down) into kcl solid and o2 gas |  |
| dry ice, frozen solid co2 sublimes directly to co2 gas. |  |
| a plant photosynthesizes sunlight and co2 to produce glucose and o2 |  |
| iron metal is oxidized by oxygen gas to produce fe2o3 seen as rust on an old iron nail |  |
| the lactose sugar in milk is converted to lactic acid by bacteria |  |
| a piece of paper is folded in half |  |
| droplets of water condense on the outside of cold glass of water on a hot summer day |  |

Accepted Answer

# Explanation:
## Step1: Recall definitions
Physical change - no new substances formed, chemical change - new substances formed.
## Step2: Analyze "Using a flashlight"
It involves energy - conversion (chemical to electrical to light), but no new substances in the flashlight itself, so physical change.
## Step3: Analyze "Boiling Water"
Water changes from liquid to gas, no new substances formed, physical change.
## Step4: Analyze "Hydrochloric acid reacts with potassium hydroxide"
New substances (salt, water) are formed, chemical change.
## Step5: Analyze "Burning wood"
Wood reacts with oxygen to form new substances like carbon - dioxide and ash, chemical change.
## Step6: Analyze "Water is heated until it boils and produces steam"
No new substances formed, just a state - change, physical change.
## Step7: Analyze "A soft piece of pure sodium metal is sliced in half"
No new substances formed, just a physical division, physical change.
## Step8: Analyze "The compound KClO3 decomposes into KCl solid and O2 gas"
New substances are formed, chemical change.
## Step9: Analyze "Dry ice sublimates"
No new substances formed, just a state - change from solid to gas, physical change.
## Step10: Analyze "A plant photosynthesizes"
New substances (glucose and O2) are formed, chemical change.
## Step11: Analyze "Iron metal is oxidized"
New substance (Fe2O3) is formed, chemical change.
## Step12: Analyze "The lactose sugar in milk is converted to lactic acid"
New substance (lactic acid) is formed, chemical change.
## Step13: Analyze "A piece of paper is folded in half"
No new substances formed, physical change.
## Step14: Analyze "Droplets of water condense on the outside of a cold glass"
No new substances formed, just a state - change (gas to liquid), physical change.

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Question

Explanation:

Step1: Recall definitions

Step2: Analyze "Using a flashlight"

Step3: Analyze "Boiling Water"

Step4: Analyze "Hydrochloric acid reacts with potassium hydroxide"

Step5: Analyze "Burning wood"

Step6: Analyze "Water is heated until it boils and produces steam"

Step7: Analyze "A soft piece of pure sodium metal is sliced in half"

Step8: Analyze "The compound KClO3 decomposes into KCl solid and O2 gas"

Step9: Analyze "Dry ice sublimates"

Step10: Analyze "A plant photosynthesizes"

Step11: Analyze "Iron metal is oxidized"

Step12: Analyze "The lactose sugar in milk is converted to lactic acid"

Step13: Analyze "A piece of paper is folded in half"

Step14: Analyze "Droplets of water condense on the outside of a cold glass"

Answer:

description	physical and chemical change (we will assume all chemical changes are also physical changes)
boiling water
hydrochloric acid reacts with potassium hydroxide to produce a salt, water, and heat
burning wood
water is heated until it begins to boil and produces steam
a soft piece of pure sodium metal is sliced in half
the compound kclo3 decomposes (breaks down) into kcl solid and o2 gas
dry ice, frozen solid co2 sublimes directly to co2 gas.
a plant photosynthesizes sunlight and co2 to produce glucose and o2
iron metal is oxidized by oxygen gas to produce fe2o3 seen as rust on an old iron nail
the lactose sugar in milk is converted to lactic acid by bacteria
a piece of paper is folded in half
droplets of water condense on the outside of cold glass of water on a hot summer day

Description	Physical and Chemical Change
Boiling Water	Physical change
Hydrochloric acid reacts with potassium Hydroxide to produce a salt, water, and heat	Chemical change
Burning wood	Chemical change
Water is heated until it begins to boil and produces steam	Physical change
A soft piece of pure sodium metal is sliced in half	Physical change
The compound KClO3 decomposes (breaks down) into KCl solid and O2 gas	Chemical change
Dry ice, frozen solid CO2 sublimes directly to CO2 gas	Physical change
A plant photosynthesizes sunlight and CO2 to produce glucose and O2	Chemical change
Iron metal is oxidized by oxygen gas to produce Fe2O3 seen as rust on an old iron nail	Chemical change
The lactose sugar in milk is converted to lactic acid by bacteria	Chemical change
A piece of paper is folded in half	Physical change
Droplets of water condense on the outside of cold glass of water on a hot summer day	Physical change