Units 1-2
(Atomic Structure & Periodic Table)
(Atomic Structure & Periodic Table)
What is the atomic number of Tellurium (Te)?
52
Write the formula of tetraphosphorus dichloride.
P4Cl2
What are the products of a combustion reaction?
water and carbon dioxide
In half-life problems, what time do you always start with?
Zero
An ion is formed when you change the number of ____________ in an atom.
Electrons
Name the group 1 elements and list one property they have.
Alkali metals
shiny, soft metals, very reactive to water
Write the formula of calcium nitrate.
Ca(NO3)2
Determine the reaction type:
AlCl3 + Na2S → Al2S3 + NaCl
Double replacement
What nuclear process is used in nuclear power plants?
Fission
bitter
pH greater than 7
slippery
turns litmus paper blue
What is the nucleus made of?
Protons and Neutrons
Name PbO
lead (II) oxide
What is the molar mass of Mg(C2H3O2)2?
142.41 g/mol
What is the most penetrating type of radiation?
gamma
How many neutrons in Carbon-13?
Seven
How many valence electrons does Germanium (Ge) have?
4
Draw the Lewis Dot Structure for oxygen
oxygen with 6 dots (2 lone pairs)
Balance the equation:
Al + Br2 --> AlBr3
2 Al + 3 Br2 --> 2 AlBr3
Isotopes of the same element differ in what two things?
number of neutrons and mass
If there is no covering on the atom, why do electrons remain close to the nucleus?
They are attracted to the positive nucleus
How many protons, neutrons, and electrons are in Bromine?
P+: 35
n0: 45 (80-35)
e-: 35
Is PbO ionic or covalent? How do you know?
Ionic, it contains a metal
How many molecules of TiO2 are in 2.5 grams?
1.9 x 1022 molecules
If U-238 undergoes alpha decay, what element does it turn into?
Thorium
2H2 + O2 --> 2H2O
How many moles of hydrogen must react with 5 moles of oxygen?
10 mol H2