7.1 Flashcards Preview

Ch 7 - Chemistry > 7.1 > Flashcards

Flashcards in 7.1 Deck (65)
Loading flashcards...
1

What is chemistry

Scientific study if matter; physical and chemical changes affecting matter and energy changes that accompany these processes

2

What is biochemistry

The study of chemical reactions such as growth, reproduction and respiration that occurs within a living organism

3

What is organic chemistry

Deals w all matter that is living or was living at one time, study of matter containing carbon which is present in all plants and animals

4

What is inorganic chemistry

Deals w matter that was never living and does not contain carbon

5

What is matter

Anything that occupies space
Solid liquid gas

6

What is physical change

When the characteristics of a substance change only in physical composition. Water to ice

7

What is chemical change

When a substance creates a new substance with different material characteristics from the original, example when hydrogen combines with oxygen to form water

8

What is sublimination

Solid passing into gaseous state without melting

9

Energy

The ability to do work to accomplish change

10

Elements

Basic units of matter that cannot be broken down into simpler substances through any chemical reaction they are pure

11

How many naturally occurring elements are there in nature

92

12

Who created the periodic table

Dmitri Mendeleev and Lothar Meyer

13

What is periodic law

Unifying concepts used to organize elements and their similarities

14

What are letters

Chemical symbols that are served as a scientific shorthand for each element

15

What does the number next to the element signify

This is known as the atomic number and it indicates the number of protons in a single particular element

16

What are the five important elements for aestheticians

Carbon
Oxygen
Hydrogen
Nitrogen
Sulfur

17

What is an atom

The smallest complete unit of an element

18

True or false
Each element consists of identical atoms

True

19

What are the three particles that make up atoms

Protons
Neutrons
Electrons

20

What are protons

Positive electrical charge

21

What are neutrons

No electrical charge

22

What are electrons

Negative electrical charge

23

Which type of atom forms with another atom to form a bond

Electrons

24

What is most responsible for the chemical behavior a.k.a. reactivity of an atom

The number of electrons present in the outer most orbiting path or shell

25

Which atoms are in the inside of the nucleus

Protons and neutrons
They are packed tightly to form a dense core at the center

26

What atom is on the outside of a nucleus

The electrons, which move around the nucleus at the speed of light on orbiting paths called energy levels

27

What is a free electron

The name given to an electron in the outer most orbit that is easily moved from its orbit

28

What happens if another atom has a shortage of electrons

A free electron will try to move to that atom

29

How does an atom become considered electrically neutral

If it is not missing any electrons

30

Which atoms are reactive

Unstable atoms