Substances
A pure substance made of only 1 type of atom.
What is an element?
On the periodic table, as you move from left to right what happens to the number of valence electrons?
What is they increase?
On a Bohr Model, the number of energy levels represents the element's ___.
What is its period?
In the chemical formula 2H2, the number of hydrogen atoms.
What is 4?
Compounds are formed by...
What is 2 or more elements chemically combined?
A pure substance made of 2 or more atoms that are chemically combined.
What is a compound?
As the number of valence electrons increases, the elements become less reactive. MOST elements need this many valence electrons to become stable (non-reactive).
What is 8? (He only needs 2)
On a Lewis structure, the element's symbol, is surrounded by the element's _____.
What are the valence electrons?
If a reaction started with 3g of baking soda and 5 g of vinegar. The total mass of the products would be...
What is 8 g?
Which subatomic particles are responsible for chemical reactions?
What are valence electrons?
A type of mixture that is not evenly mixed. The substances can be easily separated by pouring it through a filter.
What is a heterogeneous mixture?
In a family, moving in a downward direction changes the atom by...
What is increasing its energy level?
On an element's square, the atomic number describes these 2 characteristics about the element.
What are the # of protons and electrons?
The law of conservation of matter or mass states that... (must completely state the law)
What is matter/mass cannot be created nor destroyed but it can change forms?
Compounds are formed because 2 or more elements are becoming...
What is stable (non-reactive/ getting full electrons shells)?
A student observes a clear substance in a liquid state. It could be water, but it could also be salt water. If it is salt water, how would you classify it?
What is a solution (or homogeneous mixture)?
The halogen family (17) would most easily for chemical reactions with which other family?
What are the Alkali Metals (family 1)?
On a Bohr model, the number of energy levels for an atom of chlorine.
What are 3?
To demonstrate the law, chemical equations must always be...
What is balanced?
All compounds are matter, specifically classified as...
What are pure substances?
Sodium and chlorine react chemically. What subatomic particles allow the 2 elements to form a compound?
What are their valence electrons?
The most reactive element on the periodic table.
What is Francium (Fr)? It's the farthest left, 1 valence e-, & period 7.
On a Lewis structure, how many valence electrons would Argon have?
What is 8?
If a reaction begins with 35 g of sodium chloride and it reacts completely with 65 g of a mystery solution. 35 g of chlorine gas is produced plus water. What will the mass of the water be?
What is 65 g of water?
Compounds can be separated...
What is chemically?