Chapter 1&2 Flashcards Preview

PCC Biology > Chapter 1&2 > Flashcards

Flashcards in Chapter 1&2 Deck (50):
1

Aqueous Solution

A solution in which water is the solvent

2

Atom

The smallest unit of matter that retains the properties of an element

3

Atomic Number

The number of protons in each atom of a specific element.

4

Acid

A substance that increases the hydrogen ion concentration in a solution

5

Base

A substance that decreases the hydrogen ion concentration in a solution.

6

Buffer

A chemical substance that resists changes in the ph by accepting hydrogen ions from or donating hydrogen ions to a solution

7

Chemical bonds

An attraction between two atoms resulting from sharing of outer shell electrons or the presence of opposite charges on the atoms the bonded atoms gain complete outer electron shells

8

Chemical reactions

A process leading to chemical changes in matter involving the making and or breaking of chemical bonds

9

Cohesion

The attraction between molecules of the same kind

10

Compounds

A substance containing two or more elements in a fixed ratio

11

Biology

The scientific study of life

12

Biosphere

The global ecosystem the, entire portion of Earth inhabited by life all of life and where it lives

13

Controlled experiment

A component of the process of science whereby a scientist carries out to parallel tests and experimental test and a control test that experimental test differs from the control by one factor the variable

14

Discovery science

The process of scientific inquiry that focuses on describing nature

15

Covalent bond

In attraction between Adams that share one or more pairs of outer shell electrons

16

Electron

A subatomic particle with a single unit of negative electrical charge one or more electrons move around the nucleus of the Adam

17

Element

A substance that cannot be broken down into other substances by chemical means

18

Evaporative cooling

A property of water whereby a body becomes cooler as water evaporates from it

19

Heat

The amount of kinetic energy contained in the movements of the Adams in molecules in the body of matter heat is energy in it's most random phone

20

Hydrogen bond

A type of weak chemical bond formed when a partially positive hydrogen Adam from one polar molecule is attracted to the partly negative Adam in another molecule

21

Ions

And Atom or molecule that has gained or lost one or more electrons thus acquiring an electrical charge

22

Ionic bond

And attraction between two ions with opposite electrical charges the electrical attraction of the opposite charge holds the ions together

23

Isotopes

A variance form of an atom isotopes of an element have the same number of protons and electrons but different numbers of neutrons

24

Mass

A measure of the amount of material in an object

25

Eukaryotic cell

A type of cell that has a membrane enclosed nucleus and other membrane enclosed organelles all organisms except bacteria and archaea I composed of eukaryotic cells

26

Ecosystem

All the organisms in a given area along with the nonliving factors with which they interact a biological community and its physical environment

27

Gene

A unit of inheritance in DNA

28

Hypothesis

A tentative explanation that a scientist proposes for a specific phenomenon that has been observed

29

Mass number

The sum of the number of protons and neutrons in an atoms nucleus

30

Matter

Anything that occupies space and has mass

31

Molecule

A group of two or more atoms held together by covalent bonds

32

Neutron

An electrically neutral particle

33

Nucleus

An atoms central core containing protons and neutrons

34

PH scale

A measure of the relative acidity of a solution ranging in value from zero most acidic to 14 most basic

35

Polar molecule

A molecule containing polar covalent bonds have an opposite charges on opposite ends

36

Products

An ending material in a chemical reaction

37

Proton

A sub atomic particle with a single unit of positive electrical charge found in the nucleus of an Adam

38

Radioactive isotope

An isotope is nucleus decay spontaneously giving off particles and energy

39

Hypothesis driven

The process of scientific inquiry that uses the steps of the scientific method to answer questions about nature

40

Life

The set of common characteristics that distinguish living organisms

41

Natural selection

A process in which organisms with certain inherited characteristics are more likely to survive and reproduce than other organisms with other characteristics

42

Prokaryotic cell

A type of cell lacking a nucleus and other organelles found only in the domains bacteria and archaea

43

Reactants

A starting material in a chemical reaction

44

Solute

A substance that is disc dissolved in a solution

45

Solution

A liquid consisting of a homogeneous of two or more substances a dissolving agent the solvent and a substance that is dissolved this all you

46

Solvent

Did you dissolving agent in a solution water is the most versatile known solvent

47

Temperature

A measure of the intensity of heat reflecting the average kinetic energy or speed of molecules

48

Trace elements

An element that is essential for the survival of an organism but is needed only in minute quantities

49

Scientific method

Scientific investigation involving the observation of phenomena.

50

Theory

A widely excepted explanatory idea that is brought it in scope and supported by a large body of evidence