Physical and Chemical Changes and Properties of Matter Worksheet ... - Free Printable
Educational worksheet: Physical and Chemical Changes and Properties of Matter Worksheet .... Download and print for classroom or home learning activities.
JPG
298×396
29.9 KB
Free · Personal Use
Quality Assured by Worksheets Library Team
Reviewed for educational accuracy and age-appropriateness
ID: #1106488
⭐
Show Answer Key & Explanations
Step-by-step solution for: Physical and Chemical Changes and Properties of Matter Worksheet ...
▼
Show Answer Key & Explanations
Step-by-step solution for: Physical and Chemical Changes and Properties of Matter Worksheet ...
Since the user has not selected any of the optional features (ExplainAnswer, TeachTopic, GeneratePractice), I will proceed directly to solving the visible problems on the worksheet. I will break down the reasoning for each section based on standard chemistry definitions.
Section 1: Identify the following as being true or false
1. Statement: "A change in size or shape is a physical change."
* Reasoning: Physical changes affect the form of a chemical substance, but not its chemical composition. Changing size or shape (like cutting paper) does not make it a new substance.
* Answer: True
2. Statement: "A chemical change means a new substance with new properties was formed."
* Reasoning: This is the definition of a chemical change (or chemical reaction). Bonds break and form to create different molecules.
* Answer: True
3. Statement: "An example of a chemical change is when water freezes."
* Reasoning: Freezing water turns liquid $H_2O$ into solid $H_2O$ (ice). It is still water, just in a different state. This is a physical change.
* Answer: False
4. Statement: "When platinum is heated, then cooled to its original state, we say this is a physical change."
* Reasoning: Heating metal usually just expands it or changes its temperature. If it returns to the original state without reacting, it's physical.
* Answer: True
5. Statement: "When milk turns sour, this is a physical change because a change in odor does not indicate a chemical change."
* Reasoning: Souring milk involves bacteria converting lactose into lactic acid. The composition changes, and the smell indicates a new substance. This is a chemical change.
* Answer: False
6. Statement: "When citric acid and baking soda mix, carbon dioxide is produced and the temperature decreases. This must be a chemical change."
* Reasoning: Producing a gas (carbon dioxide) and a temperature change (energy release/absorption) are classic indicators of a chemical reaction.
* Answer: True
Section 2: Identify each of the following as a physical or chemical change
7. Statement: "You leave your bicycle out in the rain and it rusts."
* Reasoning: Rusting is iron reacting with oxygen and water to form iron oxide (rust). A new substance is formed.
* Answer: Chemical change
8. Statement: "A sugar cube dissolves."
* Reasoning: Dissolving sugar in water breaks the sugar crystals apart, but the sugar molecules remain sugar. You can evaporate the water to get the sugar back.
* Answer: Physical change
9. Statement: "Scientists split water molecules into oxygen and hydrogen gas."
* Reasoning: Splitting $H_2O$ into $O_2$ and $H_2$ breaks chemical bonds and creates entirely new substances.
* Answer: Chemical change
10. Statement: "Burning coal at a barbecue."
* Reasoning: Burning (combustion) is a reaction with oxygen that releases heat and light, turning carbon into carbon dioxide.
* Answer: Chemical change
11. Statement: "Trimming a bush because it has grown too tall."
* Reasoning: Cutting a bush changes its shape and size, but the plant material remains plant material.
* Answer: Physical change
Section 3: Classify Matter Worksheet
*Definitions:*
* Element: Pure substance made of one type of atom (e.g., Gold).
* Compound: Pure substance made of two or more elements chemically bonded (e.g., Water).
* Homogeneous Mixture (Solution): Uniform mixture where you can't see the parts (e.g., Salt water).
* Heterogeneous Mixture: Non-uniform mixture where you can see different parts (e.g., Salad).
12. Sand
* Reasoning: Sand is mostly silicon dioxide ($SiO_2$), but usually contains impurities and varies in grain. However, in basic chemistry worksheets, "Sand" is often treated as a Heterogeneous Mixture because it's a mix of different rock/mineral grains, or sometimes just a Compound if referring strictly to pure silica. Given the context of "Classify Matter," it is most commonly a Heterogeneous Mixture.
13. Salt
* Reasoning: Table salt is Sodium Chloride ($NaCl$). It is a pure substance made of two elements bonded together.
* Answer: Compound
14. Pure Water
* Reasoning: Water is $H_2O$. It is a pure substance made of hydrogen and oxygen bonded.
* Answer: Compound
15. Soil
* Reasoning: Soil is a mix of dirt, rocks, water, and organic matter. You can see the different parts.
* Answer: Heterogeneous Mixture
16. Soda (Just opened)
* Reasoning: Soda is water, sugar, and flavoring dissolved (homogeneous), but the "just opened" part implies the presence of bubbles (carbon dioxide gas). The gas bubbles make it non-uniform.
* Answer: Heterogeneous Mixture
17. Air
* Reasoning: Air is a mix of nitrogen, oxygen, and other gases mixed evenly.
* Answer: Homogeneous Mixture (Solution)
18. Gold
* Reasoning: Gold is an element found on the periodic table ($Au$).
* Answer: Element
19. Steel
* Reasoning: Steel is an alloy made of iron and carbon mixed together. Alloys are solid solutions.
* Answer: Homogeneous Mixture (Solution)
20. Beer
* Reasoning: Like soda, beer is a liquid mixture of water, alcohol, and hops. If it's filtered and flat, it's a solution. If it has yeast or foam, it's heterogeneous. Usually classified as a Homogeneous Mixture (Solution) in basic chemistry unless specified as "draft with foam." Let's assume the liquid itself.
* Answer: Homogeneous Mixture (Solution)
*(Self-Correction for final output: I will provide the answers clearly corresponding to the numbers visible on the sheet.)*
Final Answer:
Identify the following as being true or false:
1. True
2. True
3. False
4. True
5. False
6. True
Identify each of the following as a physical or chemical change:
7. Chemical change
8. Physical change
9. Chemical change
10. Chemical change
11. Physical change
Classifying Matter Worksheet:
12. Heterogeneous mixture
13. Compound
14. Compound
15. Heterogeneous mixture
16. Heterogeneous mixture
17. Homogeneous mixture (Solution)
18. Element
19. Homogeneous mixture (Solution)
20. Homogeneous mixture (Solution)
Section 1: Identify the following as being true or false
1. Statement: "A change in size or shape is a physical change."
* Reasoning: Physical changes affect the form of a chemical substance, but not its chemical composition. Changing size or shape (like cutting paper) does not make it a new substance.
* Answer: True
2. Statement: "A chemical change means a new substance with new properties was formed."
* Reasoning: This is the definition of a chemical change (or chemical reaction). Bonds break and form to create different molecules.
* Answer: True
3. Statement: "An example of a chemical change is when water freezes."
* Reasoning: Freezing water turns liquid $H_2O$ into solid $H_2O$ (ice). It is still water, just in a different state. This is a physical change.
* Answer: False
4. Statement: "When platinum is heated, then cooled to its original state, we say this is a physical change."
* Reasoning: Heating metal usually just expands it or changes its temperature. If it returns to the original state without reacting, it's physical.
* Answer: True
5. Statement: "When milk turns sour, this is a physical change because a change in odor does not indicate a chemical change."
* Reasoning: Souring milk involves bacteria converting lactose into lactic acid. The composition changes, and the smell indicates a new substance. This is a chemical change.
* Answer: False
6. Statement: "When citric acid and baking soda mix, carbon dioxide is produced and the temperature decreases. This must be a chemical change."
* Reasoning: Producing a gas (carbon dioxide) and a temperature change (energy release/absorption) are classic indicators of a chemical reaction.
* Answer: True
Section 2: Identify each of the following as a physical or chemical change
7. Statement: "You leave your bicycle out in the rain and it rusts."
* Reasoning: Rusting is iron reacting with oxygen and water to form iron oxide (rust). A new substance is formed.
* Answer: Chemical change
8. Statement: "A sugar cube dissolves."
* Reasoning: Dissolving sugar in water breaks the sugar crystals apart, but the sugar molecules remain sugar. You can evaporate the water to get the sugar back.
* Answer: Physical change
9. Statement: "Scientists split water molecules into oxygen and hydrogen gas."
* Reasoning: Splitting $H_2O$ into $O_2$ and $H_2$ breaks chemical bonds and creates entirely new substances.
* Answer: Chemical change
10. Statement: "Burning coal at a barbecue."
* Reasoning: Burning (combustion) is a reaction with oxygen that releases heat and light, turning carbon into carbon dioxide.
* Answer: Chemical change
11. Statement: "Trimming a bush because it has grown too tall."
* Reasoning: Cutting a bush changes its shape and size, but the plant material remains plant material.
* Answer: Physical change
Section 3: Classify Matter Worksheet
*Definitions:*
* Element: Pure substance made of one type of atom (e.g., Gold).
* Compound: Pure substance made of two or more elements chemically bonded (e.g., Water).
* Homogeneous Mixture (Solution): Uniform mixture where you can't see the parts (e.g., Salt water).
* Heterogeneous Mixture: Non-uniform mixture where you can see different parts (e.g., Salad).
12. Sand
* Reasoning: Sand is mostly silicon dioxide ($SiO_2$), but usually contains impurities and varies in grain. However, in basic chemistry worksheets, "Sand" is often treated as a Heterogeneous Mixture because it's a mix of different rock/mineral grains, or sometimes just a Compound if referring strictly to pure silica. Given the context of "Classify Matter," it is most commonly a Heterogeneous Mixture.
13. Salt
* Reasoning: Table salt is Sodium Chloride ($NaCl$). It is a pure substance made of two elements bonded together.
* Answer: Compound
14. Pure Water
* Reasoning: Water is $H_2O$. It is a pure substance made of hydrogen and oxygen bonded.
* Answer: Compound
15. Soil
* Reasoning: Soil is a mix of dirt, rocks, water, and organic matter. You can see the different parts.
* Answer: Heterogeneous Mixture
16. Soda (Just opened)
* Reasoning: Soda is water, sugar, and flavoring dissolved (homogeneous), but the "just opened" part implies the presence of bubbles (carbon dioxide gas). The gas bubbles make it non-uniform.
* Answer: Heterogeneous Mixture
17. Air
* Reasoning: Air is a mix of nitrogen, oxygen, and other gases mixed evenly.
* Answer: Homogeneous Mixture (Solution)
18. Gold
* Reasoning: Gold is an element found on the periodic table ($Au$).
* Answer: Element
19. Steel
* Reasoning: Steel is an alloy made of iron and carbon mixed together. Alloys are solid solutions.
* Answer: Homogeneous Mixture (Solution)
20. Beer
* Reasoning: Like soda, beer is a liquid mixture of water, alcohol, and hops. If it's filtered and flat, it's a solution. If it has yeast or foam, it's heterogeneous. Usually classified as a Homogeneous Mixture (Solution) in basic chemistry unless specified as "draft with foam." Let's assume the liquid itself.
* Answer: Homogeneous Mixture (Solution)
*(Self-Correction for final output: I will provide the answers clearly corresponding to the numbers visible on the sheet.)*
Final Answer:
Identify the following as being true or false:
1. True
2. True
3. False
4. True
5. False
6. True
Identify each of the following as a physical or chemical change:
7. Chemical change
8. Physical change
9. Chemical change
10. Chemical change
11. Physical change
Classifying Matter Worksheet:
12. Heterogeneous mixture
13. Compound
14. Compound
15. Heterogeneous mixture
16. Heterogeneous mixture
17. Homogeneous mixture (Solution)
18. Element
19. Homogeneous mixture (Solution)
20. Homogeneous mixture (Solution)
Parent Tip: Review the logic above to help your child master the concept of physical changes of matter worksheet.
