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Which is true of transition metals when moving from left to right on the periodic table?

A
The cation radii become larger across the period.
B
Atomic radii increase slightly and then start to decrease.
C
The d sublevels are not filled across the period.
D
Atomic radii decrease slightly and then start to increase.
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Consider the word equation. calcium hydroxide plus hydrochloric acid rightarrow calcium chloride plus water Which is the corresponding formula equation?

A
CaCl sub 2 times l rightarrow Ca times s plus Cl sub 2 times g
B
Ca OH sub 2 s plus 2 HCl l rightarrow CaCl sub 2 times aq plus 2 cap h sub 2 cap o l
C
NaOH times aq plus 2 HCl aq rightarrow NaCl times aq plus 2 cap h sub 2 cap o l
D
CaO times s plus cap h sub 2 cap o l rightarrow Ca OH sub 2 aq
43

A single atom of an element has 21 neutrons, 20 electrons, and 20 protons. Which element is it?

A
cap k
B
Sc
C
Ca
D
Zr
44

What is the element Ar classified as in the periodic table?

A
a halogen
B
a metal
C
a metalloid
D
a noble gas
45

Which compound contains both sigma and pi bonds?

A
HBr
B
HCCl sub 3
C
cap h sub 2 cap s
D
cap h sub 2 CO
46

What is the true ratio of atoms in a molecule or formula unit called?

A
the percent composition
B
the molar mass
C
the empirical formula
D
the molecular formula
47

What is taking place in a reaction as the curve on a reaction pathway graph goes up?

A
The reaction is slowing down.
B
Heat is being absorbed.
C
The reaction has stopped.
D
Heat is being released.
48

Which statement best compares the energy involved in melting with the energy involved in boiling for a given liquid?

A
Energy is removed from the particles in each change, but more energy is removed in boiling than in melting because the attractions are weaker.
B
Energy is removed from the particles in each change, but more energy is removed in melting than in boiling because the attractions are weaker.
C
Energy is added to the particles in each change, but melting requires more energy than boiling because the attractions must be completely overcome.
D
Energy is added to the particles in each change, but boiling requires more energy than melting because the attractions must be completely overcome.
49

Which element would most likely have chemical properties similar to that of fluorine ( cap f )?

A
Br
B
Ne
C
Li
D
cap n
50

Which statement best describes a pair of elements that will form an ionic bond?

A
cap p and Cl : Phosphorus easily loses electrons, and chlorine gains them.
B
Ca and Br : Calcium easily loses electrons, and bromine gains them.
C
cap c and cap h : Hydrogen easily loses electrons, and carbon gains them.
D
Li and cap o : Oxygen easily loses electrons, and lithium gains them.

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