characteristics of life (week2)

Question 1

what are the steps of the scientific methods?

Answer 1

• make an observation
• perform background research
• ask a question
  -generate hypotheses
  -make a prediction
  -perform an experiment
  -collect data
• analyze data
• conclusion

Question 2

characteristic of life (7 points)

Answer 2

1. The building blocks of life… macromolecules
2. The other building blocks of life… cells
3. Growth and reproduction
4. Energy use and the consumption of raw materials
5. Sense and respond to the environment
6. Maintain homeostasis
7. subject to evolution

Question 3

why is water essential to life

Answer 3

due to its unique properties and the ability to dissolve many polar and ionic substances (Polarity)
- universal solvent
- high heat capacity,
-cohesion and adhesion

Question 4

What factors might influence the reaction rate?

Answer 4

Temperature
pH
Addition of catalyst (AKA enzyme)
Concentration of reactants
Surface area of reactants
Surface area of reaction
Composition of reactants (type & configuration of chemical bonds

Question 5

whats an atom

Answer 5

a unit of matter
that cannot be broken
down into simpler units
by chemical processes

Question 6

Element

Answer 6

several atoms of the same
type all grouped together

Question 7

Atom

Answer 7

a unit of matter
that cannot be broken
down into simpler units
by chemical processes

Question 8

Molecule

Answer 8

substance held
together w/ chemical
bonds

Question 9

Compound

Answer 9

molecule w/
atoms of different
elements

Question 10

Electronegativity:

Answer 10

a measure of an atom’s ability to attract e- to itself

Question 11

Covalent bond:

Answer 11

a bond between two atoms which share electrons

Question 12

Nonpolar bond

Answer 12

electrons spend roughly equal time w/ each atom

Question 12

Ionic bond:

Answer 12

a bond between two atoms involving the complete transfer
of electrons from one atom to another