Vocab.
Vocab #2
Reactions / Mass Conservation
Periodic Table #1
Periodic Table #2
100
Define, and give an example of: Physical Change
A change that doesn't change the molecules or atoms of a material: ex) breaking glass, steaming water
100
Define, and give an example of: Atomic Mass
The mass of an atom of a particular element, measured in amu. Nitrogen has a mass of 14.0067 amu.
100
What are the THREE pieces of protective equipment you should wear in the lab?
Goggles, apron, gloves
100
List three properties of the elements that are useful in sorting the elements, as we did in the card sort.
Mass, size, reactivity, metal/nonmetal, physical properties, different compounds created, etc.
100
Describe at least 2 patterns going down a group in the periodic table:
Mass increases, Size increases, softness increases (generally)
200
Define, and give an example of: atomic number
A whole number ordering each element. Also, the number of protons of an atom of that element. ex) Nitrogen has an atomic number of 7
200
Define, and give an example of: Chemical Change/Reaction
A change that results in a new substance, like new compounds. ex) iron rusting, copper cycle steps
200
Where do you dispose of chemicals?
Where Mr. Srini tell you. NOT down the sink, unless you get permission.
200
Describe at least 2 patterns going across a group in the periodic table:
Size decreases, mass increases, valence electrons increase, goes from metal to metalloid to nonmetal.
200
Where are metals, nonmetals, and metalloids located?
Metals - left of stair-step line, Nonmetals - right of stair step line, Metalloids - along stair step line, except for Aluminum
300
What is the law of conservation of matter? How does it help us predict the products of a reaction?
Matter cannot be created or destroyed. It tells us that new compounds from a reaction have to made up of a combination of only the elements we started with.
300
Define and give an example of: Reactivity
How fast or easy a substance reacts with other substances. Eg, Flourine is very reactive .. it can easily react with a lot of different substances.
300
Explain how the copper cycle experiment supports the claim that copper is an element—a basic building block of matter.
Regardless of what reactions were undergone, copper was always in the compound. We also could perform reactions to get the copper by itself, and found we didn't lose any copper.
300
Suppose you have equal amounts of calcium, Ca, in two beakers. You react the calcium in one beaker with oxygen, O, and the other with sulfur, S. The reaction with oxygen forms the compound calcium oxide, CaO. a. What do you predict is the chemical formula of the compound formed from the reaction between calcium and sulfur? b. Which compound has more mass, the compound containing calcium and oxygen, or the compound containing calcium and sulfur? Explain your thinking.
a) CaS b) CaS because sulpher has more mass than oxygen per atom.
300
Do you expect carbon, C, to be more similar to nitrogen, N, oxygen, O, or silicon, Si? Explain why you think that?
Si, because it's located in the same group. Has the same # of valence electrons and so reacts with other elements in a similar way.
400
Define, and give an example of: Group
A column in the periodic table. Ex) group 2 is the alkaline earth metals.
400
Define, and give an example of: Period
A row in the periodic table. ex) the first period only has H, and He.
400
If I perform a reaction with the following ingredients: nitric acid – HNO3 (aq) and CuO (s), why is CuSO4 (aq) not a possible product?
There is no sulfur (S) in the reactants - the starting ingredients.
400
In what areas of the periodic table do you find the most highly reactive elements? (Hint: there are 2 different places)
Bottom left, upper right - except for the noble gases
400
Where are the noble gases? How reactive are they?
Last group; unreactive
500
Define, and give an example of: Flammability
How easy it is for a substance to ignite or burn. Ex) oil is very flammable
500
Define, and give an example of: oxidizing ability
How easy it is for a substance to react with oxygen. ex) Iron has a high oxidizing ability because it reacts easily with oxygen.
500
How could I prove that a substance is an element?
Lots of different ways: you could use a very powerful microscope and show that copper contained only single atoms, you could also show that copper only exists in compounds, that we can't break copper down chemically through reactions.
500
What properties would you expect from silicon (Si)? Explain how you know.
Many answers, such as 4 valence electrons, sometimes conductive to heat and electricity, solid at room temperature, sometimes dull, sometimes shiny
500
How would you expect rubidium, Rb, to react with water? Explain how you know:
very violently, explosively. It's at the bottom left of the periodic table - one of 2 reactive areas.
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