química

Question 1

intensive matter property:

Answer 1

independent of amount

Question 2

extensive matter property:

Answer 2

depends on amount

Question 3

chemical matter property:

Answer 3

when a substance goes through a chemical reaction and transforms

Question 4

physical matter property:

Answer 4

without changing chemical identity of a substance

Question 5

in what does matter clasifícate in?

Answer 5

mixtures and pure substances

Question 6

mixtures:

Answer 6

homogeneous and heterogeneous

Question 7

pure substances:

Answer 7

elements and compounds

Question 8

what’s an element?

Answer 8

some type of atoms but different from others

Question 9

what’s a compound?

Answer 9

2 or more elements, different type of atoms

Question 10

what’s a mixture?

Answer 10

combination of 2 or more compounds and elements

Question 11

what are the states of matter?

Answer 11

solid, liquid, gas

Question 12

what state of matter can be compressed?

Answer 12

gas

Question 13

at states of matter flow?

Answer 13

liquid, gas

Question 14

how does solid takes shape?

Answer 14

if you apply force

Question 15

how does liquid take shape?

Answer 15

the bottom of the container

Question 16

how does gas take shape?

Answer 16

takes the shape of the container

Question 17

energy:

Answer 17

it cannot be created or eliminated, just transformed

Question 18

energy of motion

Answer 18

kinetic energy

Question 19

stored energy

Answer 19

potential energy

Question 20

produced by chemical reactions

Answer 20

chemical energy

Question 21

derived from an electricity circuit

Answer 21

electric energy

Question 22

produced by temperature

Answer 22

thermal energy

Question 23

who discovered the neutron?

Answer 23

Chadwick

Question 24

electrons spin around the nucleus forming ellipses?
true/false

Answer 24

true

Question 25

discovered the nucleus

Answer 25

rutherford

Question 26

what charge does protons have?

Answer 26

positive

Question 27

what charge does neutrons have?

Answer 27

neutral

Question 28

what charge does electrons have?

Answer 28

negative

Question 29

what’s the atomic number?

Answer 29

number of protons

Question 30

mass number=

Answer 30

protons+neutrons

Question 31

Hund’s rule:

Answer 31

electrons with spin +1/2 are arranged before the ones with -1/2

Question 32

Aufbau principle:

Answer 32

electrons orbiting one or more atoms fill the lowest available energy levels before filling the highest

Question 33

Pauli’s exclusion principle:

Answer 33

no 2 elements of an atom can have the same set of 4 quantum numbers

Question 34

what’s an isotope?

Answer 34

it has the same number of protons but different number of neutrons

Question 35

uses of radioactive isotopes:

Answer 35

medicine, modern industry

Question 36

what did dobreiner discover?

Answer 36

trends in certain properties of elements

Question 37

law of octaves:

Answer 37

newlands: any specific elect will have similar chemical properties with the each 8 following

Question 38

what did Mendeleev do?

Answer 38

putted the elements he knew in a table with atomic weight and valences

Question 39

properties of elements are a function of their atomic numbers:

Answer 39

periodic law