Honors Chemistry 1A Midterm Review
Vocab
scientific method
solid
heterogeneous mixture
intensive property
element
liquid
precision
extensive property
compound
gas
accuracy
molecule
Law of Conservation of mass
homogenous mixture
Law of multiple proportions
Dalton’s Atomic Theory
Know examples of the following:
substances
chemical changes
heterogeneous mixtures
physical property
homogeneous mixtures
chemical property
physical changes
3) 0.234900
4) 0.00234900
Read to the proper number of sig figs
1)
2)
How many sig figs?
1) 234.900
2) 234900
Solve and round to the proper number for sig figs.
1) (566.703 – 251.2) x 10.511
2) (876.31 x 2.451) + 8734.2389
Density
1. If an object has a density of 7.45g/cm3, find the density in kg/m3.
2. Calculate the density of an object with a mass of 134.2g that displaces 10.3mL of water.
3. Find the volume of an object with a mass of 329.8g and a density of 17,6g/cm3.
4. Determine the mass of an object with a volume of 66.4mL and a density of 4.36g/mL.
Temperature Conversions
1) 35°C  K
2) 378K  °C
Metric System Conversions (know prefixes from kilo- to nano-)
1) 1890mg  kg
2) 4.37 x 10-4Dm  mm
3) 4.25 x 10-3km3  cm3
Subatomic Particles
Identify the following elements:
1) p+= 5
n0= 6
e-= 5
3)
55
X25
2) p+= 54
4)
55
n0= 77
X133
Tell number of protons, neutrons and electrons.
1) 55X25
p+=
n0=
e-=
2)
What species is represented by the following information?
1) p+= 9
n0= 10
e-= 10
2) p+= 56
55
X133
Calculate the atomic mass of the following:
1) Li-6
6.015amu
7.42%
Li-7
7.016amu
92.58%
23.9850amu
24.9858amu
25.9826amu
p+=
n0= 81
What is the empirical formula of each molecular formula?
1) C8H12O4
2) N2O4
2) Mg-24
Mg-25
Mg-26
e-= 54
78.70%
10.03%
11.17%
*Know all of the groups of the periodic table
*Know all of the charges produced when an element becomes an ion
*Know the properties of metals
*Be able to identify ionic and molecular compounds
*Be able to write formulas for ionic, molecular and acidic compounds
*Be able to write equations from words and balance the equation
n0=
e-= 54
e-=