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Science Chapter 2

Ali Grade 5

QuestionAnswer
Changes in Matter Physical Change - same chemical properties Chemical Change - matter changes, different properties. solid, liquids and gases are all changes of matter.
Physical Changes Changes in size,shape, and state of matter.raindrops and sleet are both water but look different, same chemical properties.
Chemical Changes One kind of matter changes into something different, matter changes different properties.
evaporation it takes place when particles leave a liquid and become a gas.
condensation occurs when a gas turns into a liquid
sublimation solids that change directly to gases without first becoming liquids in a process dry ice is one example
reactant a substance used in the reaction
product a substance made by the reaction
chemical equation shows what happens during a chemical reaction
phases solid, liquids, and gases are all a phase. another word for phase is a state.
collide to bang into another, it can even crash into another
ores types of rock that include metals
evidence of chemical changes burning, crystals form, may produce a gas or solid
states of matter solids, liquids, and gas are a state of matter.
solids and liquids water is a liquid when unfrozen and a solid when frozen.
freezing and melting freezing is when a liquid turns into a solid and melting is when a solid goes into liquid
particles in motion materials change size when they change temp. Generally smaller when cooler and larger when warmer.
gases it's compared to solid and liquids, particles of a gas are very far apart
chemical reactions Reactants react to make products
matter is always conserved it can not be created or destroyed during a chemical reaction.
types of chemical reactions 3 types: combination, decompostion, replacement reactions
examples of chemical reactions
separating mixtures it can be hard to chip limestone from a fossil without damaging the fossil need example
separating mixtures from ores people may use chemical properties to separate metals from their ores
separating solutions sometimes chemical properties can be used to separate elements from solutions
identifying substances indicator paper is helpful, though, in providing clues to identify of a substance.
decomposition reaction compounds split apart to form smaller compounds or elements
combination reaction elements to compounds come together to form new compounds
replacement reaction the part that switch places
bases and acids bases cause universal indicator paper to turn shades of green, blue, and purple. acids make the paper turn orange or red
Created by: alikat