True/False - Test Questions Flashcards
(31 cards)
Hypotheses are not acceptable in the scientific method
F
The presence of some error is a natural consequence of any measurement
T
The terms mass and weight are identical
F
The atomic number of an ion tells us the number of protons that are present
T
If an atom gains one electron, it becomes an anion
T
Cations ten to be formed from metal atoms, while anions are formed from non-metal atoms
T
Six electrons shared between two atoms corresponds to a double bond
F
As a rule, a polar substance will be a good solvent for polar solutes, and vice versa.
T
One atomic mass unit is the same as one gram
F
One mole of H2O contains a total of 6.02 x 10^23
T
The law of conservation of mass sates that matter cannot be gained or lost during a chemical reaction
T
Counting the number of moles on both the reactant and product sides of an equation is the first step in balancing the equation
F
The density of hydrogen gas is lower than that of nitrogen gas if both are measured at STP
T
Ionic compounds tend to have higher melting pints than molecular compounds
T
A solution in equilibrium with undissolved solute is said to be unsaturated
F
Colligative properties depend only on the concentration of solute particles, not on their identity
T
Osmosis may be defined as the movement of a solvent through a semipermeable membrane from a region of higher solute concentration to one of lower solute concentration
T
An aqueous solution containing a nonvolatile solute will boil above 100C at 1 atm pressure
T
A reaction that leads to an increase in the entropy of the system is always spontaneous.
F
In general, a liquid state will have a higher entropy than a solid state.
T
A collision between reactant molecules which produces one or more product molecules is called an effective collision
T
A catalyst increases the equilibrium constant for a reaction
F
All Bronsted-Lowry bases must contain hydroixde.
F
A pH of 0 is considered neutral
F
