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KH Sci Test Review

Science test flash cards

QuestionAnswer
Imagine you rip up a notebook full of colorful paper. Is this a physical or chemical change? Physical change
What is the material that is only made from one type of atom known as? Element
Physical or chemical change? You light a candle and the wick burns. Chemical change
Physical or chemical change? You light a candle and the wax melts. Physical change
What do you call something that takes up space and has mass? Matter
What do you call the study of matter and how it changes? Chemistry
What is a substance? A single type of matter that is always going to be the same
What is a molecule? A group of two or more atoms held together by chemical bonds, that can be the same or different atoms.
What do you call a molecule that has more than one type of atom? A compound
What is Heterogeneous? Its when the substances mixed together can easily be separated from each other
What is homogeneous? Its when the substances mixed together cannot be easily separated
What is mass? the amount of matter in an object.
What is weight? the measure of the force of gravity on an object's mass
What is volume? The amount of space that matter takes up.
What is density? The distance between the atoms in an object.
What happens to density when the atoms in an object are closer together? The object has a higher density.
What happens to density when the atoms in an object are farther apart? The object has a lower density.
What is an exothermic reaction? Energy is released.
What are some examples of exothermic reactions? lighting a fire, rubbing your hands together.
What is an endothermic reaction? Energy is taken in or sucked in
What are some examples of endothermic reactions Ice melting, warming your body in the sun
What is a physical change? The substance changes form without changing the actual object
What are some examples of physical changes? smashing, folding, boiling
What is a physical change? The substance changes into a new substance
What are some examples of physical changes? cooking, rusting, dissolving
Is baking a cake a physical or chemical change? Chemical change
Why is baking a cake a chemical change? The ingredients combine into something new that cannot be separated back into its original parts again
What is the law of conversion of mass? Matter can never be created or destroyed. No matter how many atoms you start with in a chemical reaction, you will always have the same amount and type at the end of the reaction.
True or false: We can change the weight of an object by changing the amount of gravity down. True
True or false: We can change the mass of an object by changing the amount of gravity down. False
If we combine boiling hot water and ice cold oil together, is this a heterogeneous or homogeneous mixture? Heterogeneous
Created by: taliahoffman
 

 



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