Show:
Intro to Matter
Solids, Liquids, and Gases
Elements and the Periodic Table
Atoms + Building
Chemical Reactions
100

International System of Units

a system used by scientists to measure the properties of matter



100
A puddle dries up by the process of 
Condensation
100

When Mendeleev created the first periodic table the elements were put in a specific order based on what?



Increasing Atomic Mass


100
An electron dot diagram shows an atom's number of
Electrons 
100
What is a chemical change?
A change in matter that produces one or more new substances 
200

law of conservation of mass

the fact that matter is not created or destroyed in any chemical or physical change



200
What happens to the gas particles in a inflates ball when it gets a hole? Why?

The pressure in the ball is packed tight so it is going to lose the gas particles to get the same pressure as outsides air.


200

Why was Mendeleev's "Periodic Table" useful to scientists?


They could use it to predict properties of unknown elements.


200
A covalent bond in which electrons are shared equally is called a...
polar bond
200
In what kind of reaction is energy released?
Exothermic
300

property

a characteristic that belongs to a person or thing

300

Earth’s atmosphere exerts a force of 124,500 N on a kitchen table with an area of 1.5 m to the 2nd. What is the pressure in pascals?


83,000 pascals


300

The "Periodic Table" we use today has the elements arranged according to their _______


Increasing Atomic Numbers


300
The metal atoms in iron are held together by..
Ionic Bonds
300
Is the freezing point of water a physical or chemical property? 
Physical Property
400

why elements have different properties

their atoms are different

400

Which of the following changes of states is exothermic?


Melting
400

What are the vertical columns called?


Groups


400
When an atom loses or gains electrons, it becomes a(n)
ion
400
When iron is rusted by oxygen is it a physical property? True or False?
Flase
500

example of chemical change

electrolysis

500

A substance with a definite shape and definite volume is a?


a solid 


500

Most of these compounds are SOLIDS at room temperature: (metals or non-metals)


metals


500
Polished metals have a metallic luster, which means that?
It makes them look bright and shiny, and reflect more light than other minerals.
500
When two elements react together and explode; they weight 2 lbs before. How much will they weight after the explosion? 
2 lbs