Elements Flashcards
3 states of matter
Liquid, gas, solid
Does Solids, liquids and gases have different physical properties
Yes
What shape does solid have
Fixed shape
What elements cannot be compressed
solids and liquids
What elements diffuse
liquid and gas
What is matter made of
Atoms
What are elements
substances that consist of only one type of atom chemically combined
How are elements described
Symbols and formulas such as O2 for oxygen N2 Nitrogen
What is a compound
substances that consist of more than one type of atom chemically combined
How are compounds described
symbols and formula e.g. H2O for water, CO2 for carbon dioxide
What is a mixture
2 or more substances in the same volume that are not chemically combined
Physical changes reversing
Physical changes do not result in the formation of new substances and are easy to reverse
What are the physical changes
Mixture formation, dissolving, diffusion, changes of state, melting
Chemical changes reversing
Chemical changes do result in the formation of new substances and are difficult to reverse
What are chemical changes
cooking, burning, metals added to acid, decomposing
What happens when a chemical change occurs
When a chemical change occurs a chemical reaction takes place
What are substances that take part in chemical reactions called
reactents
Substances that take part in chemical reactions are called reactants; the new substances are called
products
What useful products are produced through chemical reactions
Metals, foods, clothing, building materials
signs of chemical change
Odur, bubbles, new substances
signs of chemical change
Odur, bubbles, new substances
why do bike tires seem flatter when cold
because particles when hot move around more and more reactions,
Boiling point on graph
100c
Melting point on graph
0c
