Cal Poly Chem 110 Midterm

Matter is usually more or less dense in solids than in liquid?

more dense

Is matter more tightly packed in liquids or gases?

Liquids

What is matter?

Anything that has mass and takes up space

what are 3 physical properties of water

melting point, boiling point, density

During the water electrolysis lab, what gas was produced at the end of the negative terminal?

hydrogen

During the water electrolysis lab, what gas was produced at the end of the positive terminal?

oxygen

How did the water electrolysis lab demonstrate that water is a compound?

Two different elements were produced when electrolysis occurred.

In which state of matter do the particles move the quickest?

gas

What is the charge of a cation?

positive

what is the charge of an anion?

negative

What is hard water?

water containing dissolved compounds, usually of calcium or magnesium

what is the name for when solid becomes a gas?

sublimation

what is jennifer's favorite element?

carbon

atomic number

number of protons

mass number

# of protons + # of neutrons

how can you determine the number of valence electrons are in an atom?

group number

how do you calculate the average atomic mass?

= sum of (isotopic mass x abundance)

Ion

An atom or group of atoms that has a positive or negative charge.

Isotope

Atoms of the same element that have different numbers of neutrons

periodic law

when the elements are arranged in order of increasing atomic number, there is a periodic repetition of their physical and chemical properties

Mendelev

Proposed 1st periodic table where elements were arranged according to Atomic Mass

periods

7 along side of periodic table, tell you shell number

groups

8 groups, run across the top, tell you how many valence electrons are in the outer shell of an atom

mono

1

di

2

tri

3

tetra

4

penta

5