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Unit 0
Unit 1
Unit 2
Atomic Models
100

What is included in PPE? (3 items)

Gloves, lab coat, googles

100

Matter is anything that has _______________ and takes up __________________.

Matter is anything that has mass and takes up space.

100

How many electrons are needed for a neutral Hg atom? 

80 because the atomic number of Hg is 80. This means that there are 80 protons (+), so we need 80 electrons (-) to cancel out the positive charge and make it neutral. 

100

Where are the following subatomic particles located in an atom: protons, neutrons, electrons. 

protons and neutrons are in the nucleus 

electrons are in orbitals 

200

How many sig figs are in the following number: 0.0390? 

3 sig figs

200

How can find out how many protons an atom has based on the periodic table? 

Look at the atomic number
200

How many electrons are in 1s22s22p6

10 electrons 

200

Which model describes a positively charged center/nucleus? 

Rutherford's nuclear model 

300

True or false. 

The following number is written correctly in scientific notation: 2.9 x310

False 

300

What is the difference between a homogenous mixture and heterogenous mixture?

homogenous mixture is uniform throughout meaning it is a mix of things but looks like one thing (ex. hot chocolate)

heterogenous mixture is not uniform meaning you can see 2 or more things mixed in (ex. salad)

300

What does "n" represent? 

energy level

300
What did Dalton say about atoms?

they are small and indivisible  

400
True or false


A beaker is used to measure liquid. 

False, a graduated cylinder is used to measure liquid. A beak is used to hold liquid. 

400

How can we calculate the number of neutrons? 

mass number - atomic mass 

can also be seen as: atomic mass (avg mass# of all isotopes) - atomic number 

400

Why is it hard to track electrons?

They are too small and have a very small mass. 

400
How does the bohr model explain electron behavior?

Electrons are in set circular orbits. 

500

The SI units system is used so that scientist all over the world can use the same measuring system. What does SI stand for?  

International system of units 

500

What always changes during a chemical reaction? 

the composition (what is it made of) of the matter 

ex: wood buring turns to ash and smoke and is no longer wood

500
How many different orientations do the s, p, and d orbitals have? 

there is only one version of s 

there are 3 different orientations of p 

there are 5 different orientations of d 

500

How does the quantum model explain electron behavior?

electrons are in orbitals or spaces where we are most likely to find electrons