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Persh Chapt 7

Foundations of Chemistry

QuestionAnswer
What is the table called that lists all the known elements? The Periodic Table of the Elements
How do you calculate density? Density = mass / volume
What is a compound? a substance that consists of 2 or more different atoms that have become chemically bonded to each other
What kind of mixture do you get when you dissolve sugar in water? Homogeneous
The amount of mass in a given amount of volume is called what? density
When looking at an atom--what 2 things are in the nucleus protons and neutrons
When looking at an atom, what is in the outer rings electrons
What substance consists of only one type of atom? an element
What is a heterogeneous mixture? a mixture that has substances that are not evenly mixed
What is the boiling point of water? 100 degrees C
What is the freezing and melting point of water? 0 degrees C
What is mass? the of matter contained in an object
What is it called when an object can carry heat? thermal conductivity
What does not change, even if you change the size of a beaker? the boiling point
What are some changes that may happen if matter goes through a physical change? size, state, shape
What cannot be lost or created in a chemical or physical change? Mass
Ice cubes melting is an example of this... change of state
During a change of state, what often moves in our out of a substance? heat or thermal energy
What is a chemical change? A change when matter changes into a new substance with new physical or chemical properties
What happens when thermal energy is removed? the temperature decreases
What is sublimation? when a solid changes directly into a gas
What are flammability and reactivity? 2 chemical properties
What affects the reaction rate? increasing surface area, increasing temperature and increasing the concentration
Created by: ellist
 

 



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