Newtons laws and Net Force
The phrase "equal and opposite" applies to which law?
3rd law
What is the subscript for Hydrogen in 2HNO3?
1
Breaking a pencil in half is what kind of change?
physical
Which is the element in the list below?
a. Hydrogen gas H2
b. Salad
c. Water H2O
a
What kind of element is usually shiny, lustrous, a good conductor of heat and electricity and found on the left side of the periodic table?
metals
What is the formula related to Newton's 2nd law? Include units!
Force = Mass x acceleration.
N = kg x m/s2
NH4NO3
How many different elements are the chemical formula above?
What are they?
3
Nitrogen
Hydrogen
Oxygen
List 3 ways we know a chemical change happened?
gas produced, burning, Light produced, rusting, temperature change, rotting, odor
List 1 similarity and 1 difference between elements and compounds
similarity - both contain atoms of elements, both pure substances
difference - compounds are 2 different elements chemically bonded
What is ductility? Why is it important for metals to have this property?
ability to be turned into wires
metals conduct electricity, we use wires in electronics
Objects that have balanced forces acting on them
a. change direction
b. keep the same speed and direction
c. change speed
b. keep the same speed and direction
How many molecules are in 2Fe2O3?
2
Does the equation below follow the law of conservation of mass? Explain
KClO3 → KClO4 + KCl
No, not equal number of each elements atoms on both sides
K - 1/2
Cl - 1/2
O - 3/4
What kind of mixture looks the same throughout? For example, koolaid
homogenous mixture
What is malleability? What kind of elements are usually very malleable?
ability to be flattened into sheets
metals
The bus driver slams on the breaks, which way do you keep moving? What law is this an example of?
Forward
1st law
How many total atoms are in 2HNO3?
10
What is the law of conservation of mass state?
What kind of mixture is each example below?
a. Salad
b. Koolaid
c. Salt water
d. Pepperoni pizza
a. heterogenous
b. homogenous
c. homogenous
d. heterogenous
What special kind of metals is used most often in electronics and can be sold for a very high price?
Some examples are Sc, Y, Eu and Nd
Rare Earth Metals
As you walk you are pushing against the ground, this is the action force. What is the reaction force?
What law is this?
the ground pushing against you
3rd law
How many total atoms in 2Ba(SO4)3?
Show all work on the white board!
32
If my reactants weigh 25g at the start how much should my products weigh?
Explain
25g
Law of conservation of mass
What is a diatomic element? List 3
2 of the same element bonded together
hydrogen, nitrogen, oxygen, fluorine, chlorine, bromine, iodine
What kind of element is often called a semi-conductor?
metalloids