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According to Archimede, buoyant force acting on an object immersed in a fluid ....... weight of fluid displaced
 
equal to
 
larger than
 
less than
State formula to calculate density of an object.
density = mass : volume
What kind of oxide is calcium oxide (CaO)?
 
basic oxide
 
acidic oxide
 
neutral oxide
 
amphoteric oxide
What gas does not cause acid rain?
 
H2
 
SO2
 
NOx
 
CO2
What is indicator?
A compound that changes color at a specific pH value or in the presence of a particular substance
Dissolve salt into water. Water is called...
 
solvent
 
solution
 
solute
 
solubility
Dissolve sugar into water. Which is solute?
 
sugar
 
water
Write the formula to calculate the molar mass of CaCO3.
M(CaCO3) = M(Ca) + M(C) + 3M(O)
Which formula is INCORRECT?
 
M = n x m
 
n = m : M
 
n = V : 24.79
 
m = n x M
What is the denotation of the number of moles of 1 substance?
n
List 2 factors that affect to the rate of a reaction.
Concentration, Surface area, Temperature, Catalyst
Which statement is correct about exothermic reaction?
 
Release energy in the form of heat or light
 
Produces a decrease in temperature
 
Chemical equation: Reactants + Energy→ Products
 
Instant coldpack is an application of an exothermic reaction
January's zodiac signs are?
 
capricorn and aquarius
 
taurus and libra
 
scorpio and cancer
What is the birthstone of January?
 
Garnet
 
Diamond
 
Pearl
How many days are in January?
 
31
 
28
 
30
In Latin January is for...
 
doorway
 
exit
 
Janus
 
Cold
Janus is the god of what?
 
beginnings
 
endings
 
doorways
January is derived from what city?
 
Rome
 
Parish
 
London
 
Washington D.C.