Simple Machines
Atoms
Bonding
Periodic Table
Elements
200
Name the 6 simple machines
Screw, Lever, Wheel and Axel, Wedge, Pulley, Inclined Plane
200
Who came up with the idea of cutting something in half until you can't cut it anymore?
Democritus
200
When each atom shares an electron in a bond
Single covalent bond
200
Rows are called
Periods
200
Name 3 Noble gases
Neon, Argon, Krypton, etc.
300
What are 3 ways machines make work easier?
Force, distance, direction
300
Which model was the first to show the electron?
Thompson (Plum pudding)
300
Why do elements bond with each other?
They want to stabilize their valence shell with electrons
300
Which family is tin in?
Carbon
300
This element is a liquid at room temperature... Why is this the case?
Mercury - its melting point is very low!
400
What is the equation for MA
OF/IF
400
These add mass to an element but doesn't change its properties
Neutrons
400
What type of bond is formed between a metal and nonmetal?
Ionic
400
As you go down a group on the periodic table, what happens to the atomic radius? Also what happens to reactivity?
Larger and more reactive
400
give me 3 properties of metals and 3 props of nonmetals
Metals - shiny, malleable, ductile, silver, solids at RT
Nonmetals - brittle, dull, not conductive
700
What is the IMA of an inclined plane that has a length of 2.7m and a height of 2.025m?
1.33333333
700
Who discovered the proton?
Rutherford
700
Which group do the halogens like to bond with and why?
Alkali - because they need one electron and alkali has 1 in their valence shell
700
As you go to the right across a period, elements become...
Heavier and less reactive
700
These two elements, when bonded, create table salt
Sodium and Chlorine
1000
What is the efficiency of a machine that has an output work of 1000J after 1250J are input into it?
83.33%
1000
How many valence electrons does phosphorous have?
5
1000
Draw a Lewis dot diagram for the N2
1000
Without looking... what is the atomic mass of lithium?
7
3 protons and 4 neutrons
1000
What is the most abundant element in the human body by weight?
Oxygen, making up about 61-67%
Carbon is next with about 20%