What are the 2 types of pure substances?
Elements and Compounds
How many types of mixtures are there?
2
What is a solvent?
A liquid that can dissolve other substances
What is a homogenous mixture?
A mixture that is uniform throughout
What is the periodic table?
A list of all the elements (NOT Water, Earth, Fire And Air)
What is an Element?
It’s a pure substance made up of only one type of atom
Name at least 3 ways to physically separate a mixture
Separating Funnel, Filtration, Sedimentation, Distillation, Evaporation, Sieving, Magnetic Separation, Crystallization, Chromatography, Centrifuge
What is the solvent that can dissolve the most things?
Water. It is capable of dissolving more substances than any other liquid.
What is the name for the transition from solid to liquid?
Melting
What are the 3 broad categories on the periodic table?
metals, nonmetals and metalloids
What is a Compound?
A mixture of 2 or more Elements
What are the 3 sizes of particles in mixtures?
Solution, Colloid and Suspension
Can water dissolve cotton?
No
lol sorry I ran out of ideas
What is a heterogeneous mixture?
A mixture that is non-uniform
what are the columns called on the periodic table
groups and/or chemical families
What is the difference between Elements and Compounds?
Elements cannot be separated by any means, chemical or physical, whereas compounds can be separated chemically
What are the 2 types of mixtures?
Homogeneous and Heterogeneous
How many positively charged atoms and how many negatively charged atoms does water have
there is a positive charge on each of the 2 hydrogen atoms and a negative charge on the oxygen atom.
How many states of matter are there?
There are 4, Solid, Liquid, Gas and Plasma
(There are actually way more than this, but I couldn't be bothered to list/find them all)
How many elements are on the periodic table?
118
How does one separate Compounds into the elements they are made up of?
Compounds can be separated by undergoing chemical changes/reactions
Name all 10 ways to separate a mixture physically
Separating Funnel, Filtration, Sedimentation, Distillation, Evaporation, Sieving, Magnetic Separation, Crystallization, Chromatography, Centrifuge
How does water dissolve things?
one atom in the water molecule (hydrogen) has a positive electrical charge and the other atom (oxygen) has a negative charge. This allows the water molecule to become attracted to, and therefore pull apart, many other different types of molecules.
At what temperature do the molecules start to bond for longer when forming ice?
4oC
Russian scientist Dimitri Mendeleev.