Chemistry 1024A/B Lecture Notes - Lecture 1: Atomic Nucleus, Unified Atomic Mass Unit, Atomic Number

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redporpoise263

6 Apr 2016

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Document Summary

The study of matter, its properties and changes at the atomic and molecular level. Matter is anything that has mass and occupies space. Three states: solid: rigid shape and fixed volume, liquid: fixed volume but not rigid in shape, gas: neither fixed volume or rigid shape. Element: a type of matter that cannot be broken down into two or more pure substances. It is a substance in which all atoms have the same atomic number. Compound: a pure substance that contains more than one element. Physical properties: can be observed without changing the chemical identity of the substance. Chemical properties: are observed when a substance takes part in a chemical reaction. Cannot be determined just by viewing or touching the substance. Atom: a neutral species consisting of (atomic nucleus formed from protons and neutrons) Protons- positive charge (+1) and a mass of 1 amu. Electrons- (e-, particles carrying one negative charge (-1), amu of 1/2000.

Related Questions

1) Classify each of the following as a mixture, a compound, or an element?

table sugar, propane, bronze, tea, vinegar, dry ice, oxygen, aluminum

2) Select the statements that pertain to elements. Select all the statements that apply.
a) These can be broken down by physical means.
b) These cannot be broken down by chemical means.
c) These combine chemically to form new substances; they are building blocks of matter.
d) These are chemical combinations of simpler forms of matter.
e) These are pure substances.

3) Which of the following are chemical changes? Check all that apply.
a) sugar is dissolved in water
b) a warm coke bottle fizzes when opened
c) the copper roof turns green over time
d) baking soda is dissolved in vinegar and bubbles appear
e) a fog appears on your windshield in cold weather

4) Classify each property as physical or chemical.

a)susceptibility to rust

b) flammability

c) boiling point

d) melting point

e) conductivity

f) color

5) Which of these substances are elements? Check all that apply.

a) silicon

b) iodine

c) lead

d) quartz