Thẻ ghi nhớ: Unit 2: States of Matter (Cambridge Science 0893, Stage 7) | Quizlet

matter

Anything that has mass and takes up space

states of matter

solid, liquid, gas

properties

characteristics used to describe an object

volume

The amount of space an object takes up

compressed

squashed

decision

choice made from among available alternatives

theory

an idea to explain evidence

particle

a very small piece of matter that everything is made up of

pour

to flow

vibrate

to move back and forth quickly

flow

to pour

vacuum

A space where no particles of matter exist

hypothesis

A testable prediction, often implied by a theory

melts

solid to liquid

melting point

The temperature at which a solid becomes a liquid

water vapour

water in gas form

evaporation

The change of a substance from a liquid to a gas

boil

To heat a liquid until bubbles rise constantly to the surface

boiling point

The temperature at which a liquid changes to a gas

steam

water vapour

condensation

The change of state from a gas to a liquid

freezes

changes from liquid to solid

changes of state

Transformations of matter from one state to a different one, for example, from a gas to a liquid.

measuring cylinder

Used to measure volume of liquids accurately.

meniscus

The curved upper surface of a liquid in a tube

thermometer

An instrument used to measure temperature

heat energy

a form of energy that is transferred by a difference in temperature

transferred

moved from one place (or form) to another

expand

To increase in size or amount

attractive forces

the force by which one object attracts another

water cycle

The continuous process by which water moves from Earth's surface to the atmosphere and back

transpiration

Evaporation of water from the leaves of a plant

precipitation

Any form of water that falls from clouds and reaches Earth's surface.

surface run-off

water that stays on top of the land and flows back to a water source.

groundwater

water that fills the cracks and spaces in underground soil and rock layers

open water

the area of an aquatic ecosystem where the rooted plants do not reach the surface of the water

atoms

Building blocks of matter; the smallest particle of an element

nanotubes

very small tubes

element

A pure substance made of only one kind of atom

Periodic Table

A chart of the elements showing the repeating pattern of their properties

periods

Horizontal rows on the periodic table

groups

Vertical columns on the periodic table

symbol

A thing that represents or stands for something else, especially a material object representing something abstract.

metals

Elements that are good conductors of electric current and heat.

non-metals

Low conductivity, not ductile, not malleable, brittle, dull, gas at room temp

compound

A substance made up of atoms of two or more different elements joined by chemical bonds

bonding

the way in which atoms join together

sodium chloride

table salt

formula / formulae

uses chemical symbols to show how many atoms of different elements are present in particle of an element or compound

filings

Small pieces of a solid element

pure

not mixed with anything else

pipe-clay triangle

Used for supporting crucible

evaporating basin

used for evaporating a solution

composition

the makeup of something

mixture

A combination of two or more substances that are not chemically combined

natural emissions

naturally released pollutants from volcanoes, lightning, forest fires, plants, etc.; these include carbon monoxide, nitrogen oxide, particulate matter and sulfur dioxide