Sig Figs
How many sig figs are in the following number?:
40.7
3
What charge is a neutron?
Neutral (neither positive nor negative).
What are the three classes of elements on the periodic table? (hint: list them)
Metals, Nonmetals, Metalloids
What type of bond is formed when two nonmetal atoms share electrons?
Covalent
What is the chemical formula for table salt?
NaCl
How many sig figs are in the following number?:
27000
2
What are the four orbitals in an atom? (hint: list them)
S, P, D, F
Why are the elements in the S & P blocks referred to as "representative elements"?
They generally follow rules, unlike transition and inner-transition metals.
What type of bond involves the transfer of electrons from a metal to a nonmetal?
Ionic
What is the correct formula for aluminum oxide?
Al₂O₃
27.93 + 6.4 = ?
(hint: round to the correct # of sig figs)
34.3
Write the full electron configuration for the following element: Sodium (Na).
1s² 2s² 2p⁶ 3s¹
List the following elements in order from largest to smallest: As, F, Sr, Ag
Sr, Ag, As, F
A bond where electrons are shared unequally due to a difference in electronegativity is called...?
Polar covalent bond
What is the correct formula for Calcium Chloride?
CaCl₂
6.7 x 4.3 = ?
(hint: round to the correct # of sig figs)
29
Write the full shorthand electron configuration for the following element: Lead (Pb).
[Xe] 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 6s² 6p²
Which of the following elements behaves similarly to Calcium?: Sodium, Sulfur, Magnesium, Chlorine
Magnesium
What is the written formula for ionic bond NiO?
Nickel (II) Oxide
Balance this equation: __H2 + __O2 -> __H2O
_2_H2 + _1_O2 -> _2_H2O
All of the following numbers have the same amount of sig figs. True or false?
1.25, 40.8, 0.050, 0.0500, 6.00 × 10²
False, 0.050 has two sig figs.
Strontium-90 has a half-life of 28 years. If I started with a 670g sample, how much strontium-90 would be left after 112 years?
41.875g
Who is known as the "father of the periodic table"?
Dmitri Mendeleev
What is the molecular shape of H₂O?
Bent
Balance this equation: __Al + __HCl -> __AlCl3 + __H2
_2_Al + _6_HCl -> _2_AlCl3 + _3_H2