Chapter 21 Flashcards Preview

Science > Chapter 21 > Flashcards

Flashcards in Chapter 21 Deck (23)
1

Anything that has made and occupies space.

Matter

2

Deals with how the natural world operates.

Basic research

3

Develops applications for basic research.

Applied research

4

The smallest unit of an element that can exist independently.

Atom

5

A group of atoms bonded together. H20- 1 oxygen atom, 2 hydrogen atoms.

Molecule

6

Atoms are arranged in a fixed position.

Solids

7

Atoms can move past each other.

Liquids

8

The study of matter and the transformations it can undergo.

Chemistry

9

Atoms can move freely in all directions.

Gases

10

Observable characteristics of a substance. (Color, texture, phase)

Physical properties

11

A substance changed its phase or properties but not its chemical composition.

Physical change

12

Describes how one substance interacts with another and created a new substance.

Chemical properties

13

Involves the rearrangement of a substance atoms creating a new substance with different properties.

Chemical change

14

The attraction between two or more atoms that holds them together in a molecule.

Chemical bond

15

The process In which atoms are rearranged to create a new substance.

Chemical reaction

16

Shows how many individual atoms are bound together in an elements pure form.

Elemental formula

17

Created when atoms of different substances are bonded together to create a new substance. (Water, NaCl)

Compound

18

A method used to show the number and types of atoms present in a substance. (Co2)

Chemical formula

19

Shows the number of atoms in the chemical formula. (H20, 1 atom of o, 2 atoms of h)

Subscript number

20

A summary of a chemical change.

Chemical equation

21

Substance that exists before a chemical change. Located on the left of the chemical equation.

Reactants

22

Substance that exists after the chemical change. Locating on the right of a chemical equation.

Products

23

Matter is neither created nor destroyed during a chemical reaction.

Law of mass conservation