Which represent elements and which represent compounds?
A) H
B) He
C) HF
D) Hf
A) element
B) element
C) compound
D) element
100
What is an isotope and give an example?
An atom of the same element with different masses
Example: Carbon 12 and 14
100
Refer to the periodic table to identify each element as a metal or a nonmetal.
A) Manganese
B) Strontium
C) Cesium
D) Argon
A) metal
B) metal
C) metal
D) nonmetal
100
Write the formula for calcium chloride.
CaCl₂
100
What are the units for Molarity?
M= m/L
200
Without consulting the periodic table, name each:
A) Al
B) Ca
C) Cl
D) Ag
A) aluminum
B) calcium
C) chlorine
D) silver
200
How did Boyle define an element?
Boyle said an element must be tested to see if it could be broke down into simpler substances.
200
Which elements are alkali metals?
Lithium, Sodium, Potassium, Rubidium, Cesium, and Francium
200
What is the name of Cl-
Chloride ion
200
What is a mole?
The amount of substance that contains the same number of elementary units as there are atoms.
300
Indicate which is the larger unit in each:
A) mm or cm
B) kg or g
A) cm
B) kg
300
Is the following in agreement with Dalton's atomic theory:
An atom of calcium has a mass of 40u; and atom of vanadium has a mass of 50u
Yes, Dalton assumed that different atoms had different masses
300
An atom in an excited state is one with an electron that has ________.
Moved to a higher energy level
300
Draw the Lewis dot structure for iodine.
..
: I .
..
300
Calculate the molarity of .0875 mol C with 634mL of solution
.0875 mol C / .634 L =
.138M
400
What is the density in grams/mL of a salt solution of 37.5mL that has a mass of 43.75g?
43.75g / 37.5ml =
1.17 g/ml
400
Acetylene, used for welding, contains 24.02g of carbon for every 2.02g of hydrogen. If you have 78.5g of carbon that can be converted to acetylene, what mass of hydrogen will be needed for the conversion?
(78.5g C)(2.02g H / 24.02g C) =
6.60g H
400
Which elements are noble gases?
Helium, Neon, Argon, Krypton, Xenon, and Radon
400
Classify the following bond as nonpolar covalent, polar covalent, or ionic:
O-H
Sulfur forms two compounds with fluorine, T and U. Compound T has 0.447g of sulfur combined with 1.06g of fluorine; compound U has 0.438g of sulfur combined with 1.56g of fluorine. Show that this data supports the law of multiple proportions.
Compound T= 0.447g S /1.06g F = 0.422
Compound U= 0.438g S /1.56g F = 0.281
0.422/0.281 = 1.50
500
Write electron configurations for:
A) Iron
B) Tin
C) Lead
A) 1s²2s²2p⁶3s²3p⁶3d⁶4s²
B) 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p²
C) 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁶6s²4f¹⁴5d¹⁰6p²
500
Use Lewis symbols to show the transfer of electrons from sodium atoms to bromine atoms to form ions with noble gas configurations.
.. ..
Na. + . Br : ----> Na+ + : Br : -
.. ..
500
What is Avoadros number and what does it mean?
6.02 x 10²³
Defined as the number of atoms in a 12-g sample of carbon 12