Level 1
What is evidence a chemical change occured?
Color change, bubbles, temperature change, precipitate
Now that you have avoided being grounded you get greedy and decide to add more sugar to the drink. How can you dissolve more sugar?
Increase the temperature
A sample of calcium has a mass of 80 g, how many moles are present?
2 moles ca
Is Y an element, compound, or mixture?
(See attached WordDoc)
Compound
Two gasses are placed in a container that reaches thermal equilibrium of 283 K. Describe the kinetic energy of the gasses
Both gasses have the same average kinetic energy because they are at the same temperature
List three intensive properties
Color, density, reactivity, state of matter, ect.
When a small volume of water is boiled, a large volume of steam is produced. Why
The molecules are further apart for the steam
What are three ways to increase the volume of a balloon.
The number of particles increases
Lower pressure outside balloon
Warm the balloon
Lithium is a metal that is shiny and malleable. Is this description physical or chemical properties?
Physical
100 gram block of copper at 20 ∘C lowered into 100 grams of water at 100 ∘C. Heat will flow from ____ to ______ until it reaches ________?
The water to the copper until thermal equilibrium
List three extensive properties
Mass, volume, length
Describe the change that occurs between points
B → C
(See attached WordDoc)
The kinetic energy is constant & potential energy increases
One of the methods of separating a mixture is distillation. What separates liquids in a distillation?
Boiling Point
Which sample would contain more atoms: 12g of C or 12g of Mg? Why?
12g of C, Carbon atoms have less mass ∴ 12g of each, the smaller atom sample will contain a greater number of atoms
Why cannot extensive properties be used to identify a substance?
They do change based on amount so it tells you almost nothing about composition without further study
An iron nail is suspended on a thin wire in a sealed jar of moist air. The surface of the nail becomes red over time. What chemical change has occurred?
Oxidation
Why can intensive properties be used to identify a substance?
They do not change based on amount
Which graph best represents the best thermal equilibrium graph to represent mixing 200mL of 90°C water with 50mL of 20°C water?
(See attached WordDoc)
C - there is a larger volume of the higher temperature water, the equilibrium temperature will be closer to the higher temperature water
2 L of a 6 M solution of NaOH is made with how many moles?
12 mol
What is the volume of a balloon that contains 2 moles of carbon at 3 atm and 400 K?
21.89 L
You are not allowed to eat sugar. You sneak some sugar into your tea. Your parents walk into the room, see the sugar, and ground you. List three things you could have done to avoid being grounded.
Crush the sugar (decrease the particle size)
Heat the water
Stir the tea
List three physical properties…
List two chemical properties...
Physical: Color, density, state of matter, solubility, melting point
Chemical: reactivity, combustibility, corrosivity, toxicity
According to Kinetic molecular theory as temperature increases pressure increases because the particles move _________ colliding with the wall of the container _________ frequently
Faster, more
This group of nonmetals is nonreactive
Noble Gases
100 g of water was heated from 30*C to 80*C. The specific heat of water is 4.18 J/g*C
20,900 J