Chemistry Semester 1 Final Review

Periodic Table

100

What does the atomic number mean?

The number of protons and therefore electrons of an atom.

200

What is a covalent molecule?

A molecule that is made up of 2 nonmetals that SHARE electrons.

300

³⁶P has how many protons, electrons, and neutrons?

15 protons, 15 electrons, 21 neutrons

400

What is the electron configuration for Calcium?

1s² 2s² 2p⁶ 3s² 3p⁶ 4s²

500

What is the chemical formula for carbonate?

CO₃^2-

Molecular Structure

100

What is the Lewis Dot Structure for Nitrogen?

Mrs. Wood needs to draw this

200

What is the Lewis Dot Structure of CCl₄?

Mrs. Wood needs to draw this 

300

What is the geometric shape of CH₄?

Tetrahedral 

400

What is the bond angle of a pyramidal-shaped molecule?

107^o

500

What is the difference between a pyramidal and trigonal planar shape?

Pyramidal has an unbonded electron pair on the central atom.

Chemical Reactions

100

What is a decomposition reaction?

A reaction where one molecule/compound is broken down entirely into separate components.

200

Balance this chemical equation:

C + SO₂ --> CS₂ + CO

5C + 2SO₂ --> CS₂ + 4CO

300

What is Molar Mass?

The mass of one mole of a substance. It is equivalent to the molecular mass in grams.

400

What is the conversion from amu to grams?

1 amu = 1.66 x 10^-24 g

500

3CCl₄ + 2SbF₃ --> 3CCl₂F₂ + 2SbCl₃ 

If a chemist has 6.24 grams of CCl₂F₂, how many grams of SbF₃ did he use?

6.15 grams of SbF₃

Math

100

How many significant figures does 0.003245600 have?

7

200

Convert 751289000 into scientific notation.

7.51 x 10⁸

300

What is the difference between precision and accuracy?

Precision - most decimal places

Accuracy - most close to correct

400

What is 72.3^oF in Kelvin?

295.5K

500

What is the equation for frequency?

frequency = speed of light / wavelength