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Periodic and Reactio
Periodic Table and Reactions
Question | Answer |
---|---|
What is group 1 called? | alkali metals |
What is group 2 called? | alkaline earth metals |
What is group 3-12 called? | Transition metals |
What are the two rows below the Periodic table called? | Lanthanide and actinide series |
What is group 17 called? | Halogens |
What is group 18 called? | Nobel gases |
How many valence electrons are there in each group? | Group 1=1, 2=2, 3-12=varies, 13=3, 14=4, 15=5, 16=6, 17=7, 18=8 |
Group direction | vertical |
Period direction | horizontal |
These types of elements are also called semiconductors. | metalloids |
What type of element makes up most of the periodic table | metals |
Endothermic reactions begin by | taking in energy/heat |
Exothermic reactions end by | releasing heat/energy |
Reactants are | elements/compounds that chemically combine |
Products are | results of the reactants |
A synthesis reaction occurs when | two reactants make one product |
A decomposition reaction occurs when | one reactant makes two products |
A combustion reaction occurs when | carbon dioxide and water are products |
A physical change | does not change the chemical composition of the substance |
Ions | positively or negatively charged atoms. |
What determines how an element reacts? | valence electron number |
Period number is the same as | number of energy levels |
Chemical reactions create | new substances |
What are the charges of all the subatomic particles? | electrons-negative protons-positive neutrons-neutral |
What is an element? | A pure substance that cannot be broken down by chemical means. |
Atomic number is the same as | number of protons |
Atomic mass number is found using | the number of protons and neutrons |
Balance this equation | CH4 + O2 CO2 + 2 H2O |
What is oxidation number? | How many electrons an elements loses or gains in a chemical reaction. |
What compound would sulfur (oxidation number of -2) and Lithium (oxidation number of +1) make? | L2S |