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Unit 2 Lesson 1-Scie

Changes of State, Matter, Chemical & Chemical Reations

Altering the form or organization of an object without changing the type of matter within it is called a (an)__________. physical change
The 3 states of matter are________,________,and _________. solid, liquid, gas
The state of matter of an object is a(n) ________ property. physical
The average movement of molecules in an object is measured by ____________________. temperature
When a solid gains heat energy, its molecules begin vibrating too quickly to stay together, so the solid becomes a(n) _________. liquid
When gases loose heat, they _____________ into liquid. condense
A liquid loses heat and ____________ into a solid. freezes
When a solid changes directly into a gas, it is ____________. sublimation
Energy from __________ can cause the different forms of water on Earth to change state in the water cycle. the sun
When a substance melts or boils, it absorbs _____________. heat energy
The temperature at which a substance changes from a solid to a liquid is its ____________________. melting point
The temperature at which a substance boils is its _________. boiling point
The temperature at which a substance changes from a liquid to a solid is its __________________. freezing point
Nonmetals' particles are weakly attracted to one another, so they have _______ melting and boiling points. low
The slow change from a liquid to a gas at temperatures below the boiling point is called _____________________. evaporation
Usually, particles of matter draw ___________________ as they loose heat. closer/tightly
Water molecules move _______________ apart just before freezing. further apart
A color change on metal that is caused by a chemical change is called ______________. tarnish
Bubbles form when baking soda and vinegar are mixed, indicating that a _____________________has taken place. chemical change
A solid that forms when 2 solutions are mixed is called a(an) ________________. precipitate
If a chemical reaction produces heat and light, then reversing the reaction should _________________. absorb energy
Plants use a chemical reaction called ________________. photosynthesis
Plants and animals use a chemical reaction called _______________ to burn sugars for energy. respiration
Photosynthesis is a chemical reaction that provides living things with food and ______________. oxygen
A combination of 2 or more elements is called a(an) ___________. compound
A compound has different properties than do the ________________ that formed it. individual elements
Rust is a combination of iron and _______________. oxygen
The chemical name for rust is ______________. ironoxide
The chemical formula for rust is ____________. Fe2O3
Changing one substance into another is ______________. chemical change
When atoms break their old links and form new links with other atoms, a(n) _____________has occurred. chemical reaction
Chemist keep track of substances are used and created in a chemical reaction by writing ___________________. chemical equations
Chemicals on the left side of a chemical equation are called ___________. reactants
Chemicals on the right side of a chemical equation are called ____________. products
IN every chemical reaction, the total mass of the reactants always equals the total mass of the products. This fact is know as the ____________________________________________. law of conservation of mass
Created by: Sunlite705