Atoms and Matter
How many valence electrons does oxygen have?
6
Which state of matter has a definite volume but indefinite shape?
liquid
What is a suspension?
When the solute doesn't mix with the solvent
A bottle of hydrogen peroxide that eventually turns into a bottle of water and oxygen gas is an example of what kind of reaction?
decomposition
If you and a friend are spinning in a circle and your reference point is your friend, are you moving?
no
What are the most reactive nonmetals called?
The Halogens
What is viscosity?
The thickness of a liquid
What is a colloid?
When the solute is so evenly mixed in it appears to be dissolved but there are microscopic particles that haven't
What type of reaction is FeS + 2 HCl ----> FeCl2 + H2S?
double replacement
I am on earth. Am I accelerating? Why or why not?
Yes because the earth is always changing direction.
If you drew an electron dot diagram for Aluminum, how many dots would you draw?
3
What is surface tension?
the way the surface of water acts like a skin
How does a solute affect boiling point?
It raises it
What is the difference between a chemical and a physical change?
chemical- new substances are formed. physical-appearence has changed
If I drop a stationary ball and it travels 12 m/s and in two seconds is traveling at 36 m/s. What is the acceleration?
12m/s squared
How many atoms of a Group 1 element would you need to combine with a Group 16 element?
2
What is a crystalline solid?
One that holds it shape all the way through
Why does salt dissolve in water?
Because salt is made of Sodium and Chlorine Ions
What is the difference between endothermic and exothermic reactions?
endo-absorbs heat
exo-gives off heat
What two factors affect friction?
the surface type and how hard the objects are pushing on eachother.
Which element is the most reactive on its own?
Flourine
Give an example of a crystalline solid.
Sugar, salt
Why does sugar dissolve in water?
Because sugar is polar and so is water.
What is a precipitate?
a solid formed from a chemical reaction
If I am sitting on earth and the moon is my reference point, am I moving?
Yes