Chem/Phys
Changes
Changes
Tearing a piece of paper is a...
physical change
Br2 is a...
element
If an element is lustrous, what is another word to describe the element?
Shiny
What is the top element percentage in humans?
oxygen
What is the state of matter that water vapor is?
Gas
Chemical changes cannot be ________
Reversed
MgCO3 is a....
compound
Metalloids can only conduct electricity when...
they are hot
What element is the highest percentage in the atmosphere?
nitrogen
This state of matter has molecules/particles that are moving a little bit and flow.
Liquid
Elephant toothpaste produced heat, so it was a....
chemical change
All mixtures have to have a compound. True or false, why?
False, it can be two elements
Nonmetals are usually this state of matter...
Chlorine makes the salt water oceans salty. True or false, why?
True, Chlorine and sodium come together to make sodium chloride (salt)
Solids will always keep their shape no matter what. True or false, why?
True, their molecules are tightly packed in rows
Mixing a blue and a green liquids that creates a red mixture is an example of a _________ change.
chemical
Sugar water (C6H12O6 + H2O) is a mixture of what two things?
compounds
Aluminum foil is a good example of which property of metals?
Malleability, Luster, Conductivity
The earth's outer most layer is made of this element...
oxygen
What is called when water's state of matter transitions from liquid to gas?
evaporation
When you melt wax on a candle it is an example of a _______ change.
physical
What is the order of the following vocabulary from smallest to biggest:
Compounds, Atoms, Elements, Mixtures
Atoms < Elements < Compounds < Mixtures
There are _____ metalloids on the periodic table.
7
What percentage of the atmosphere is nitrogen?
~78%
Which two states of matter take the shape of the container?