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Flashcards in True/False - Test Questions Deck (31):
1

Hypotheses are not acceptable in the scientific method

F

2

The presence of some error is a natural consequence of any measurement

T

3

The terms mass and weight are identical

F

4

The atomic number of an ion tells us the number of protons that are present

T

5

If an atom gains one electron, it becomes an anion

T

6

Cations ten to be formed from metal atoms, while anions are formed from non-metal atoms

T

7

Six electrons shared between two atoms corresponds to a double bond

F

8

As a rule, a polar substance will be a good solvent for polar solutes, and vice versa.

T

9

One atomic mass unit is the same as one gram

F

10

One mole of H2O contains a total of 6.02 x 10^23

T

11

The law of conservation of mass sates that matter cannot be gained or lost during a chemical reaction

T

12

Counting the number of moles on both the reactant and product sides of an equation is the first step in balancing the equation

F

13

The density of hydrogen gas is lower than that of nitrogen gas if both are measured at STP

T

14

Ionic compounds tend to have higher melting pints than molecular compounds

T

15

A solution in equilibrium with undissolved solute is said to be unsaturated

F

16

Colligative properties depend only on the concentration of solute particles, not on their identity

T

17

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

18

An aqueous solution containing a nonvolatile solute will boil above 100C at 1 atm pressure

T

19

A reaction that leads to an increase in the entropy of the system is always spontaneous.

F

20

In general, a liquid state will have a higher entropy than a solid state.

T

21

A collision between reactant molecules which produces one or more product molecules is called an effective collision

T

22

A catalyst increases the equilibrium constant for a reaction

F

23

All Bronsted-Lowry bases must contain hydroixde.

F

24

A pH of 0 is considered neutral

F

25

A standard solution is a solution whose concentration is accurately known

T

26

The conversion of Fe2+ ion to Fe3+ ion is an oxidation reaction

T

27

A rechargeable battery can operate either as a voltaic cell or as an electrolytic cell

T

28

Compared to the energy of chemical bonds, nuclear binding energy is very weak

F

29

Isotopes with even number of protons and neutrons are generally more stable than those with odd numbers of these particles

T

30

Commercial nuclear power plants use the fusion process to generate electrical energy

F

31

Doubling the distance from a source of radioactivity will halve the radiation intensity

F