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6th U3.3 Science

Unit 3 Lesson 3 Physical and Chemical Changes

QuestionAnswer
A ___ property of matter is any property taht can be observed or measured without changing the chemical identity of the substance. Physical
A __ is a change that affects one or more physical properties of a substance. Physical Change
___Changes occur when a substance changes from one form to another, but the chemical identity of the substance remains the same. Physical
The appearance, ___ or size of a substance may be altered during a physical change. Shape
Stretching a rubber band is an example of a ___. Physical change
Dissolving sugar in water is an example of a ___. Physical change
Cutting your hair is an example of a physical change. True or False True
A ___ occurs when one or more substances change into entirely new substances with different properties., Chemical change
True or False: Chemical changes are not exactly the same as chemical properties. True
Chemical changes are the __ by which substances actually change into new substances. Process
Chemical changes involve changes in the arrangements of particles and are often influenced by ___. Temperature
How are physical and chemical changes different? Chemical changes result in new substances. Physical changes do not result in new substances.
True or false: Chemical changes often cause fizzing or foaming. True
Water boiling is an example of a ____ change. Physical
Soured milk is an example of a ___ change. Chemical
When a chemical change occurs and liquids combine to form a solid it is called a ___. Precipitate
Chemical changes can cause energy to change from one form into another. An example is a burning candle, the chemical energy stored in the candle converts to ___ and ___ energy. heat and light
The French chemist ____ studied chemical changes in which substances seemed to lose or gain mass. Antoine Lavoisier
Anotine Lavoisier studied chemical changes and first demonstrated the law of conservation of mass that states ___. In an ordinary chemical and physical changes, mass is not created or destroyed. Mass is only transformed into different substances.
The law of conservation of mass is also called the law of ___ Conservation of matter
The law of ___ states that energy cannot be created or destroyed. Energy can only change from one form to another. Conservation of energy
Changes that ABSORB energy are called __. Endothermic
Changes that release energy are called __. Exthermic
Created by: PRO Teacher wmeeks