munira teacher
What common fruit is made out of barium and 2 sodium?
BaNaNa
What is the most active nonmetal?
Fluorine
Firework is example of .......... reaction.
exothermic
Smallest unit of chemistry.....
atom
Avogadro's number = ....
6.02 * 1023
How many neutrons are present in 1 atom of chlorine - 35.5
18
What element is used while combustion process?
O2
Definition of corrosion.
Interaction of metals with water,oxygen, etc.
For what stands (p)?
proton
How many chemistry teachers do we have?
4
Element which is always liquid at the room temperature
Mercury/Bromine
What are the products of the reaction between water and metal?
Metal hydroxide and hydrogen gas
The first element of the periodic table
H
Name the group of the most active metals in periodic table
Alkali metals
What is the mass of 1,5 moles of potassium hydroxide(KOH)?
K = 39, O = 16, H = 1
39+16+1 = 56
56 * 1,5 = 84g
Octet rule
Name the noble gases
He , Ne , Ar , Cr , Xe , Rn
Oxygen is best described as a?
Nonmetal
Calculate the molar mass of water(H2O).
H = 1, O = 16
18 amu
Selena Gomez and Justin Bieber have been in relationship for many years. But one day Justin fell in love with Hailey and broke up with Selena.
What kind of chemical reaction is this?
single displacement
Write the electron configuration of Mg
(Atomic number = 12, Atomic mass = 24)
1s2 2s2 2p6 3s2
The formula of atomic mass number(A)
A = p+n
How is ozone written as?
O3
What are the colors of metals,nonmetals and metalloids?
Metals:metallic shiny(grey)
Nonmetals:dull
Metalloids:metallic shiny
How many periods and groups in the periodic table?
18 groups, 7 periods