Chapter 2
βΛβΉ α° πππππππ 2βΛβΉ α°
chapter one recap: βwho wants to be a billionaire?β
Smallest unit of life: cells
Smallest level of organization: atom
Energy is always a: one way flow
Which of the following is a domain: Eukarya
In an experiment the baseline used for comparision is known as: control
Which of the following is not true about the characteristics of life: Energy is not required
Chapter Two Questions: a breakdown of life
All forms are made of what? matter
What is matter made up of? elements
Can elements be broken down? no
When two or more elements are combined what is created? compound
Living things are mainly composed of which six elements? Carbon, o2, nitrogen, hydrogen, phosphorus and sulfur
What are atoms made up of? Electrons and protons
What is the smallest piece of an element that retains the characteristics of the element? atoms
What is a proton? Positively Charged (+)
What is an electron? Negatively charged (-)
What is a neutron?
What indicates an elements protons?
How do you calculate the mass number? ( # of protons + neutrons)
Will electrons and protons always be the same?
What unit is used for atomic weight: daltons
What is an isotope?
What are atoms organized into?
What are the rules of electrons?
Is 8 electrons stable?
What is the max for an electron in a ring?
What is the Octet Rule?
What is a valence shell?
Why are noble gases set apart? They are not reactive; They are satisfied
What are the three different types of bonds?
What is covalent: Sharing of electrons (strongest bond)
Ionic Bond: give and take of electron (Intermediate; losing and gaining)
Hydrogen Bond:
What two elements stay inside of the nucleus?
What is a non-polar covalent bond? Equal sharing of electrons so there is no charge
Polar covalent bond: Unequal sharing of electrons so it has slight changes
Losing electrons is a positive charge
Gaining electron is a negative charge
Is liquid water more dense than solid ice? T/F
What is cohesion?
What do you call it when two different molecules stick together?
What are the properties of water?
s
one of the atoms of always hydrogen (weakest bond)
Dalton
No charge (0)
A molecule