Chemestry for Engr

Question 1

What is matter?

Answer 1

Anything that ocupy space and has volume.

Question 2

Properties of matter

Answer 2

Intrinsic
Extrinsic
Intensive
Extensive
Physical
Chemical

Question 3

Intrinsic?

Answer 3

Permanent like salt’s taste, Salty

Question 4

Extrinsic

Answer 4

Not permanent. Varies of the object, volume depends on mass and density

Question 5

Intensive

Answer 5

Measurable but not dependent on the amount

ex. Boiling point

Question 6

Extensive

Answer 6

Measurable and varies to the amount

ex. Size

Question 7

Physical Change?

Answer 7

Change that happen and can be observed
ex.
Liq to Gas- Evaporation
Gas to liq - Condensation
Liq to sol- Solidification
Sol to liq - Melting
Gas to sol - Deposition
Sol to gas - Sublimation

Question 8

Chemical Change

Answer 8

ex.
Fe + O(2) = 2Fe(3)O(3) rusting
envolves combomation of elements to form new.

Question 9

Classification of matter

Answer 9

Pure substance which can be devided to 2, Elements and Compound, Under Elements there are 3, Metals, Metalloids, Nonmetals.

and the second one is Mixture which is devided to 2, Homogeneous and Heterogeneous, Under Homo is Solution and under Hetero is Colloids and Sunpensions.

Question 10

What is 7 SI?

Answer 10

The 7 international standard for base units

Question 11

What are the 7 SI?

Answer 11

Mass(kg)
Time(s)
Length(m)
Temperature(K)
E. current(A)
No. of particles(mol)
light intensity(cd)

Question 12

Quantity of matter contained in an object (process by weighing)

Answer 12

Mass

Question 13

Force that gravity exerts on an object

Answer 13

Weight

Question 14

What is Lenght(m) cubed

Answer 14

Volume

Question 15

Intensive property; ratio of an object’s mass to its volume

Answer 15

Density

Question 16

How to get the volume of an Iregular shape?

Answer 16

Water displacement method

Question 17

Density formula

Answer 17

D=M/V

Question 18

Mass formula

Answer 18

M=D×V

Question 19

Volume formula

Answer 19

V=M/D

Question 20

F° To C°

Answer 20

F°=(1.8 × C°) + 32

Question 21

C° to F°

Answer 21

C°=(F°-32)÷1.8

Question 22

1. K to C°

2. C° to K

Answer 22

1. C°+273.15

2. K-273.15

Question 23

Malapit sa target pero ung tama di magkakadikit

Answer 23

Accuracy

Question 24

Malapit sa target at the same time malapit din sa isa’t isa

Answer 24

Precision

Question 25

Refers to the largely emperical description

Answer 25

Models

Question 26

Assumption about the behavior of a system

Answer 26

Theory

Question 27

Widely accepted, well defined, well tested theories

Answer 27

Laws

Question 28

3 levels of understanding | in learning chemistry

Answer 28

Macroscopic Microscopic Symbolic

Question 29

Units

Answer 29

Designate the type of quantity measured Ex. Mass - Kg Kg is the unit

Question 30

Prefixes

Answer 30

The scale added to the base units Ex. 100 kg Kilo is the prefix scale given in grams

Question 31

Derived units

Answer 31

combination of base units

Question 32

Scientific notation

Answer 32

Use to write very small or very large numbers.

Question 33

Errors in the measurements

Answer 33

Ramdom error- Measurement that is Randomly too high or to low (associated with equipnent limitation) Systematic error- Measurement that is Consistently too high or to low (pressence of impurity)

Question 34

Atom

Answer 34

Basic unit of element From the greek word atomos means uncuttable indivisible by Democritus

Question 35

Jhon Dalton

Answer 35

1808 Dalton's Atomic Theory Elements are composed of extremely small particles called atoms Chemical reaction only involves the separation, Combination and Arangement; not destructed or created

Question 36

Joseph Jhon Thomson

Answer 36

1897 Discovered electron Plum pudding model 1904 electron were distributed throuout the atom.

Question 37

Earnest Rutherford

Answer 37

Gold foil experiment or geiger-marsden experiment | Discovered atomic nucleus

Question 38

James Chadwick

Answer 38

Discoverd Neutron 1932

Question 39

Neil Bohr model of an atom

Answer 39

Nucleus Centermost part where protons and nuetrons are located. Energy level/orbit/shell- where electrons are located Valence electrons- electrons in the outermost energy level

Question 40

Modern atomic model

Answer 40

Electrons are clouds of (-) charge sorrounding Nuclues

Question 41

Scanning and tunneling microscope

Answer 41

invented by Gerd Binning and Heinrich Rohrer | an instrument for imaging surfaces of thr atomic level

Question 42

Atomic Number

Answer 42

Number of protons in a nucleus | if atom is nuetral: No. of protons is= No. of electrons

Question 43

Mass number

Answer 43

Sum of protons and nuetrons

Question 44

Isotopes

Answer 44

Atom that have the same atomic no. bit different mass no.

Question 45

Isotopic abundance

Answer 45

Mass percentage of an isotope in an naturally occuring element.

Question 46

Atomic mass

Answer 46

Also known as atomic weight Atomic mas unit (amu) exactly equal to 1/12 of the mass of carbon-12 atom

Question 47

Ability to conduct electricity

Answer 47

* Electrolytes-Aqueous solution that are capable of conducting electricity (Exist as Ions) * Non-Electrolytes-Aqueous solutions that doesnt conduct electricity(Nuetral molecules)

Question 48

Oxides

Answer 48

Contains oxygen

Question 49

Salt

Answer 49

Ionic compound containing Cation except H+ and Anion except OH produced by nuetralizing acid and base.

Question 50

Ions

Answer 50

Charge particles | formed when electrons are lost or gained

Question 51

Cation

Answer 51

electron lost; Net positive charge

Question 52

Anion

Answer 52

Electron is gained; Net negative charge

Question 53

Mono atomic Poly atomic

Answer 53

Single atom group of atoms

Question 54

Molecules

Answer 54

aggregate of atleast 2 atoms; Electrically nuetral

Question 55

Diatonic mol Polyatomic mol

Answer 55

Containing 2 atoms of the same element(H(2)) or different element (CO) Contains more than 2 atoms (H20,NH3)