Questions and Answers
How do I know if my experiment is a chemical or physical change?
A chemical change always has a change of color, can possibly form bubbles, and may involve formation of a precipitate, gas, odor change, and temperature change. A physical change includes melting, size change, volume change, color change, density change, and crystal form.
What causes the substance change in chemical reactions?
A process that causes a substance to change into a new substance with a new chemical formula, involving breaking or making of interatomic bonds.
What causes the substance change in physical change?
Cutting, bending, dissolving, freezing, boiling, and melting.
Water being heated? What kind of change is that?
Signup and view all the answers
Explain the physical change that causes clouds to form.
Signup and view all the answers
What evidence of a chemical reaction is observed when dropping an Alka-Seltzer tablet in water?
Signup and view all the answers
What evidence indicates that new substances with different properties are formed in a chemical reaction?
Signup and view all the answers
What is an example of a chemical change?
Signup and view all the answers
What happens when a shower turns into steam?
Signup and view all the answers
What is an example in my everyday life of a physical change?
Signup and view all the answers
Study Notes
Chemical vs. Physical Change
- Chemical changes are indicated by color change, bubble formation, gas production, odor changes, and temperature variations.
- Physical changes include processes like melting, change in size or volume, changes in color and density, and altering crystal form.
Causes of Substance Changes
- Chemical reactions result in new substances with different chemical formulas due to breaking and making interatomic bonds.
- Physical changes do not alter the chemical composition of substances and include actions such as cutting, bending, dissolving, freezing, boiling, and melting.
Heating Water
- Heating water can produce a chemical change when reactants interact, leading to a temperature change that indicates a reaction.
Cloud Formation
- Clouds form through condensation, a physical change where water vapor turns into liquid.
Evidence of Chemical Reactions (Alka-Seltzer)
- Dropping an Alka-Seltzer tablet in water produces bubbles, a sign of a chemical reaction that releases carbon dioxide gas.
Indicators of New Substance Formation
- Chemical reactions can be evidenced by temperature changes, gas production, precipitate formation, and color changes indicating new substances with different properties.
Lighting a Match
- Lighting a match is a chemical change resulting from reactants forming different products through a chemical reaction.
Boiling Water and Steam
- The transformation of boiling water into steam is a physical change, as it still consists of water molecules despite changes in state due to temperature.
Everyday Physical Change Example
- Melting an ice cube in a cup of water is a physical change, as energy is added but the substance remains water.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
This quiz focuses on the signs of chemical changes versus physical changes in experiments. Learn about color changes, gas formation, and other indicators of chemical reactions through flashcard questions. Perfect for students exploring basic chemistry concepts.
