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Science T1, L3-T2L1

Study for the topic one Lesson 3 and topic 2 lesson 1 test

What is a physical change? A physical change is something that changes the appearance of matter, but doesn't change the substance.
What are three examples of a physical change? 1. Glass breaking 2. tearing paper into two pieces 3. When Ice melts
What is a chemical change? It's a change in matter that creates a new substance.
What is another word/words for chemical change? Chemical reaction.
What are 3 examples of chemical changes? 1. When rust forms 2. When gasoline burns 3. When wood burns
True or false: Photosynthesis is a physical change. False
What are some signs that a chemical change has occurred? Change in color, formation of gas (bubbles), temperature change.
Define energy The ability to cause change or do work.
All changes in matter require some kind of ________. Energy.
The fact that matter is not created or destroyed is called the... Law of conservation of mass.
This means that the mass does what after a physical or chemical change? This means that the mass stays the same.
Temperature The measure of the average kinetic energy of particles inside a substance.
What is kinetic energy? (A simple synonym for it) motion
What is thermal energy? The TOTAL Kinetic energy of all the particles in a substance.
How does thermal energy move? From warm to cold.
Give an example of how Thermal energy works. I'm are holding a piece of ice. It starts to melt in my hand. I'm moving the thermal energy from my hand (warm) to the ice cube. (cold).
Define Kinetic Energy... Energy obtained through motion.
Question: Ice cube; 35 degrees C 1/2 cup of water; 35 degrees C || Which has more KE? The 1/2 cup of water because it has more particles.
What are some examples of physical changes? Melting, boiling, evaporation, baking.
What are some examples of when TE is released? When something freezes, condensation forms, when fire works are shot off.
Define... Physical Change Matter stays the same before and after the change.
Chemical change Two or more substances combined to form different substances.
Physical property.. Characteristics that can be observed without change.
Chemical Property.. Describes an objects ability to change.
Examples of physical property Luster, shape, size, smell, color, taste, the ability to desolve
Examples of Chemical property.. The ability to rust, mold, burn, combust, and the ability to react.
Physical changes of state.. (Examples) Melting; solid to liquid, evaporation; liquid to gas, freezing; liquid to solid,
Signs that a PHYSICAL change has occurred: If the form or appearance has changed.
What are the four types of Chemical Changes? Oxidation, tarnishing, objects catch fire, and bubbles are created/bubbling.
Created by: runner522