Atoms, elements and compounds C3

Question 1

chemical reaction

Answer 1

when 2 or more substances react together to from a new substance

Question 2

identifying physical and chemical changes

Answer 2

substance made or not, reversible or not

Question 3

sign for the reaction can be reversable

Answer 3

⇌

Question 4

example for reversible reaction copper II

Answer 4

hydrated copper II sulfate ⇌ anhydrous copper II sulfate

Question 5

example for reversible reaction cobalt II

Answer 5

hydrated cobalt II chloride ⇌ anhydrous cobalt II chloride

Question 6

elements

Answer 6

substance that contains only one type of atom

Question 7

compound

Answer 7

substance containing two or more types of atoms that are chemically joined

Question 8

mixture

Answer 8

contains elements and compounds, but not chemically joined

Question 9

properties of metal

Answer 9

shiny, good conductors, high melting/boiling points, ductile(stretches to a wire), sonorous (rings when hit), malleable (can be beaten into shape)

Question 10

properties of non-metals

Answer 10

dull, poor conductors, low melting/boiling point, brittle (easy to break)

Question 11

metalliods

Answer 11

non of metal or non metal, elements make stair case shape from boron to polonium

Question 12

alloys

Answer 12

metals mixed with other elements

Question 13

solution

Answer 13

mixture that is formed by fully dissolving a substance into another

Question 14

solute

Answer 14

substance dissolved (solid)

Question 15

solvent

Answer 15

substance that dissolves (liquid)

Question 16

concentration

Answer 16

amount of solute dissolved into a certain volume. number of moles in 1 decimeter cubed. moles per dm3 / mol dm-3. 1 liter = 1 dm3

Question 17

nuclide notations

Answer 17

nucleon num at top, proton num at bottom, element symbol in middle

Question 18

electron arrangement

Answer 18

2 in the first, 8 on the next one, 8 on the last one

Question 19

electron configuration

Answer 19

carbon 2,8,2 oxygen 2,8,6 first num represents electron in first shell an so it goes on

Question 20

valence electrons in groups

Answer 20

1,2,3,4,5,6,7,8 group number = valence

Question 21

isotopes

Answer 21

same element, but different numbers of neutrons, making it to have different mass numbers. ex carbon14

Question 22

ions

Answer 22

elements that have charges through gaining and losing electrons

Question 23

ionic bonding

Answer 23

electrostatic force of attraction between oppositely charged ions

Question 24

ionic lattice

Answer 24

element1 - element2 - element1

Question 25

oxydation