Basic
What is the chemical symbol for Strontium?
Sr
What is the correct name for SO?
Sulfur monoxide
Give the two products formed when HBr reacts with KOH.
H2O, KBr
How many atoms are there in 1 mole of a substance?
6.022 ×1023
What is the most electronegative atom in the periodic table?
Fluorine.
Which element has the symbol of W ?
Tungsten
What is the formula for aluminum hydroxide?
Al(OH)3
Which coefficients balance the equation AgI + Na2S → Ag2S + NaI
2,1,1,2
What is the approximate molar mass of oxygen molecule?
32
Mention 3 physical indicators that suggest that a chemical reaction has taken place
Formation of ppt , color change, formation of gas, heat
A group that has metals, nonmetals and metalloids.
Groups 14,15,16
What is the chemical formula of phosphoric acid?
H3PO4
Which coefficients balance the equation CO2 + H2O → C6H12O6 + O2
6,6,1,6
How many moles are there in a 200.0g sample of KBr ( KBr molar mass = 119.002 g/mol)
1.68 moles
T or F
Water is considered to be a diatomic molecule because it is composed of two different atoms.
F
Mention 4 noble gases.
He, Ne, Ar, Kr, Xe
Give an example of diprotic acid.
H2SO4 / H2S
Which coefficients balance the equation As + NaOH → Na3AsO3 + H2
2,6,2,3
What is the molality of a 2Kg of water that has 120g of NaCl
m mass of NaCl = 58.44 g/mol
1.02 m
Mention the precipitate forms when the solution of Na2S is mixed with BaNO3
Ba2S
How many elements are classified as metalloids?
6 elements
What is the formula of the chemical substance used in bleach?
NaOCl
Complete the equation:
Ag + HCl
No reaction
What is the molality of a 2Kg of water that has 120g of NaCl
m mass of NaCl = 58.44 g/mol
1 ×10 -9
How many electrons are there in H+
Zero