Chapter 3 Section 1
Chapter 3 Sections 2 & 3
Chapter 4 Section 3
Chapter 4 Sections 1 & 2
Random Chem Stuff
100

What does SI stand for?

International System of Units

100

What is the percent error equation?

Actual - Observed / Actual X 100%

100

What are valence electrons

outermost shell electrons

100

What does "Atomos" mean?

cannot be divided

100

Most of the atom is ________

Empty space

200

0.85 km =0.528 mi ____ m

850

200

What's the difference between accuracy and precision?

Accuracy is close to bullseye

precision is how many times can you repeat it

200

What is mass number 

Atomic mass rounded to nearest whole number

200

What is the law of multiple proportions?

Whenever a fixed amount of one element could combine with different masses of a second element, those masses always occurred in a ratio that could be reduced to small whole numbers.

200

What is an isotope?

Same element with different mass so different number of neutrons

300

6,250 mg =  _____ g

6.25 g

300

What are the 2 types of uncertainty? Describe them

Random - Slight variations when the same person repeats measurements with the same instrument and Systematic - Skewed measurements in only one direction from a known instrumental issue

300

What is atomic mass

Protons plus neutrons

300

Who developed the law of definite proportions?

John Proust

300

Draw Thomson's experiment on the board

HAHA

400

2.75 kL = _____ L

2,750 L

400

What is the density equation?

m / V

400

What is Atomic Number?

protons

400

Name the 5 scientists who developed the 5 models

dalton, thomson, Rutherford, bohr, schrodinger

400

What experiment did Rutherford perform?

Gold Foil

500

What are the 3 reasons we use the Metric (SI) System?

Only one unit for each measurable dimension (think meter/kilometer vs. feet/yard/mile

Units are based on natural phenomena and most are based on physical constants so they can be verified easily

It is a decimal system so you are moving up and down the scale by the factors of ten so it's easier to convert.

500

What are the 4 Sig Fig rules?

nonzero digits are significant

All zeros between nonzero digits are significant

All ending zeros to the right of the decimal are significant

Leading zeros are NEVER significant

500

What are the 3 Key ideas of atomic theory?

  • All matter is made of atoms.
  • Atoms of the same element are identical.
  • Atoms combine in whole-number ratios.
500

What are the 5 models in chronological order?

solid sphere, plum, nuclear, planetary, quantum

500

Draw the unit prefix chart 

HAHA

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