test 1

Question 1

dimensional analysis

Answer 1

changing quantities by units of measure mkhddcmmnp

Question 2

heterogenous mixture

Answer 2

Each component keeps its original properties each sample of the mixture will be different not uniform

Question 3

homogenous mixture

Answer 3

completely uniform in composition and portion of components each sample of the mixture is exactly the same

Question 4

chemical change

Answer 4

when matter undergoes changes in composition

Question 5

physical change

Answer 5

alter a substance without changing its composition

Question 6

mixture

Answer 6

A physical blend of two or more substances which retain their own identity

Question 7

compound

Answer 7

combination of two or more atoms can be separated chemically

Question 8

solution

Answer 8

homogeneous or heterogeneous a combining of 2 or more different substances

Question 9

atomos

Answer 9

indivisible

Question 10

smallest particle

Answer 10

atom

Question 11

atomic theory

Answer 11

1. all elements are composed of indivisible particles called atoms
2. All atoms of the same element are identical in properties
3. Atoms cannot be created or destroyed or subdivided by any chemical reaction
4. Atoms of different elements can physically mixer chemically combine in simple whole number ratios to form chemical compounds
5.  Chemical reactions can occur when atoms are separated join or rearranged

Question 12

what part of the atomic theory is wrong

Answer 12

that atoms cannot be divided because they are made of electrons neutrons and protons

Question 13

law of conservation mass

Answer 13

atoms cannot be created or destroyed during chemical or physical changes

Question 14

problem with bohrs solar system model

Answer 14

The electrons are not being moved around the nucleus in constant speeds because they would implode

Question 15

quantum mechanical model

Answer 15

based on the solar system model electron stay in the spot in the space between the nucleus they don’t move called the electron cloud model

Question 16

 electron

Answer 16

negative charge e-. in space around the nucleus. 9.11x10^-28 g

Question 17

proton

Answer 17

positive charge p+. in the nucleus. 1 AMU

Question 18

neutron

Answer 18

no charge n°. in the nucleus. 1 AMU

Question 19

nucleus

Answer 19

small dense positive
composed of protons and neutrons
electrons fly around the nucleus in empty space

Question 20

thomson

Answer 20

discover the electron with the cathode ray tube and the plum putting model electron spread evenly through the positive charge of an atom

Question 21

milikan

Answer 21

Calculated the charge of the electron with the oil drop

Question 22

schrodinger

Answer 22

created the electron cloud model and has the current model based on a 90% probability of finding an electron in space around the nucleus

Question 23

bohr

Answer 23

Solar system model electrons orbiting the nucleus at constant speed wrong because they would include

Question 24

rutherford

Answer 24

develop the theory of the nucleus with the gold foil experiment

Question 25

metals property

Answer 25

shiny malleable ductile and good conductors

Question 26

nonmetals

Answer 26

hard brittle gases poor conductors and hydrogen is a nonmetal

Question 27

metalloids

Answer 27

Seven solids boron silicon arsenic Hilarion astatine germanium and antimony. Si Ge a great semi conductors of electricity at high temp

Question 28

bohrs energy levels

Answer 28

Level one can hold two electrons level 2 8 electrons level 3 18 electrons level 4 32 electron

Question 29

mendeleev

Answer 29

Am down similar properties across

Question 30

mosley

Answer 30

similar properties down atomic number across flipped the table

Question 31

law of definite proportions

Answer 31

a given chemical compound always contains the same elements in the exact same proportions by mass.

Question 32

law of multiple proportions

Answer 32

when two different compounds are composed of the same elements the ratio of the mass of the elements will always be whole numbers

Question 33

cathode ray tube

Answer 33

thompson discovered the electron with this. The rays move from the negative end to the positive end of the tube realizing the rays were made of negatively charged particles called electrons

Question 34

gold foil exp

Answer 34

by Rutherford. Using a thin sheet of gold foil he shot alpha particles through the foil some passed through and others were deflected. atoms are mostly empty space and are positively charged