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Flashcards in States of Matter Deck (36):
1

Solid

state of matter that has a fixed shape and volume

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Liquid

state of matter that has a fixed volume, but no fixed shape

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Gas

state of matter with no fixed shape or volume

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Properties

characteristics or features of an object or substance

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Diffusion

the spreading of one substance through another due to the movement of their particles

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Mass

the quantity of matter in an object (usually measured in grams or kilograms)

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Volume

the amount of space taken up by an object or substance

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Fluid

a substance that flows and has no fixed shape. Gases and liquids are fluids.

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Melting Point

the temperature at which a solid substance turns into a liquid (melts) or a liquid turns into a solid (freezes)

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Boiling Point

the temperature at which a liquid changes to a gas

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Sublimation

the change in state from a solid into a gas (or from a gas into a solid) without first becoming a liquid

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Preciptation

falling water in solid or liquid form. The type of precipitation depends mostly on the temperature in the clouds and the air around them.

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Meteorologist

scientist who uses observation of the atmosphere to predict or explain the weather

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Particle model

a description of the moving particles that make up all matter and how they behave. The model explains the properties of solids, liquids and gases.

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Expands

increase in size due to the movement of particles in a substance

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Contracts

shorten or become smaller in size

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Alchemists

olden-day ‘chemist’ who mixed chemicals and tried to change ordinary metals into gold. Alchemists also tried to tell the future.

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Investigations

activity aimed at finding information

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Observations

information obtained by the use of our senses or measuring instruments

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Scientists

people skilled in or working in the fields of science; scientists use experiments to find out about the material world around them

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Elements

pure substance made up of only one type of atom

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Atoms

a very small particle that makes up all things. Atoms have the same properties as the objects they make up.

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Atomic number

number of protons in the nucleus of an atom. The atomic number determines which element an atom is.

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chemical symbol

the standard way that scientists write the names of the elements, using either a capital letter or a capital followed by a lowercase letter. For example, carbon is C and copper is Cu.

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Compounds

substance made up of two or more different types of atoms that have been joined (bonded) together

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Bonded

force that holds particles of matter, such as atoms, together

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Mixture

a combination of substances in which each keeps its own properties

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Hydrogen

the element with the smallest atom. By itself, it is a colorless gas and combines with other elements to form a large number of substances, including water. It is the most common element in living things.

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Oxygen

a gas in the air (and water) that animals need to breathe in; made up of particles with two oxygen atoms. Plants produce oxygen as part of photosynthesis.

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Metal

elements that conduct heat and electricity; shiny solids that can be made into thin wires and sheets that bend easily. Mercury is the only liquid metal.

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Non-metal

elements that do not conduct electricity or heat. They melt and turn into gases easily and are brittle and often coloured.

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Metalloid

elements that have the appearance of metals but not all the other properties of metals

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Periodic table

a table listing all known elements. The elements are grouped according to their properties and in order of the number of protons in their nucleus.

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Group

in the periodic table of elements, a single vertical column of elements with a similar nature

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Inert

not reactive

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Noble gas

elements in the last column of the periodic table. They are extremely inert gases.