The Chemestry Of Life Section 1

Question 1

atom

Answer 1

Basic unit of matter

Question 2

Atom’s 3 parts

Answer 2

Nucleus, protons, neutrons

Question 3

Nucleus

Answer 3

central core of an atom

Question 4

Proton

Answer 4

positively charged substomatic particles

Question 5

Neutrons

Answer 5

substomatic particles with no charge

Question 6

Electron

Answer 6

negatively charged particle with little mass, always in motion

Question 7

Element

Answer 7

a pure substance that consists of one type of atom

Question 8

Isotopes

Answer 8

elements that have a different number of neutrons

Question 9

some isotopes can be…

Answer 9

radioactive

Question 10

can be dangerous but they also are used to…

Answer 10

age rocks/fossils, detect and treat cancer, kill bacteria, and trace movement within an organism

Question 11

atomic number

Answer 11

Number of protons

Question 12

Atomic mass

Answer 12

Number of protons plus neutrons

Question 13

in nature, most elements are found combined with

Answer 13

other elements

Question 14

Compound

Answer 14

A substance made up of 2 or more elements

Question 15

chemical formula

Answer 15

tells number and kind of atoms in the compound

Question 16

atoms in compounds are held together by

Answer 16

chemical bonds

Question 17

valence electrons

Answer 17

The electrons available to form bonds

Question 18

Ionic bond

Answer 18

Formed when one of more electrons are transferred from one atom to another

Question 19

Atoms that lose and electron become

Answer 19

Positive

Question 20

Atoms that gain an electron becomes

Answer 20

Negative

Question 21

Ions

Answer 21

Atoms that loose or gain an electron (take in a charge)

Question 22

positive is attracted to negative so the atoms come together and form an

Answer 22

Ionic bond

Question 23

Covalent bonds

Answer 23

atoms share one or more electrons (atoms travel around the nuclei of both atoms)

Question 24

share 1 pair
share 2 pairs
share 3 pairs

Answer 24

Single covalent bond
Double covalent bond
Triple covalent bond

Question 25

Molecule

Answer 25

The structure that results when atoms are joined together

Question 26

because of their _________ atoms of different elements do ________ all have the same ability to attract electrons

Answer 26

structure, not

Question 27

When atoms in a covalent bond share electrons, the sharing is not always...

Answer 27

equal

Question 28

van der Waal forces

Answer 28

intermolecular forces of attraction between molecules