Unit 1
Which of these physical properties would change depending on how much of a substance you were measuring?
mass, volume
If J.J. Thomson were alive today, which dessert might he use to describe his atomic model?
chocolate chip cookie
Which option describes a common property of the elements, nitrogen (N), phosphorus (P), arsenic (As)?
They have the same number of valence electrons.
What percentage of a radioactive isotope remains after 4 half-lives?
6.25%
Which substance is the least likely to dissolve in water?
vegetable oil (nonpolar)
Which of the following is an inorganic compound?
ammonia (NH3)
According to Pascal's principle, how does pressure from a hand squeezing a ketchup bottle move throughout the ketchup?
The pressure extends equally in all directions.
Which compounds are most likely to have ionic bonds?
MgO
NaF
What type of particle is emitted by each type of radioactive decay?
alpha = nucleus of a helium atom
beta = electron
gamma = photon
How do the particles that are dispersed in a colloid differ from the particles suspended in a suspension?
The colloid particles are smaller.
Which are advantages of the SI system?
It is easy to change from one unit to another.
It allows scientists to compare experimental results.
How do carbon-12 and carbon-13 differ?
They have different amounts of neutrons, and different mass numbers
When an element in the oxygen family is involved in a chemical reaction with a metal, what charge will its atoms most likely form?
2-
Which reaction model represents a nuclear fission reaction?
n + A ~~ B + C + n
Water has a slight negative charge around its oxygen atom, and a slight positive charge around its hydrogen atoms.
Which type of solvent is water?
Polar