mr smith questions
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
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
List three physical properties…
Color, density, state of matter, solubility, melting point.
Label the Variables: What is the initial volume of a 0.96M solution of acetic acid if it was diluted to 800 mL and had a new molarity of 0.3 M?
V1 = ?; M1 = 0.96 M; V2 = 800 mL; M2 = 0.3M
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
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.
What are three ways to increase the volume of a balloon?
The number of particles increases
Lower pressure outside balloon
Warm the balloon
List two chemical properties.
reactivity, combustibility, corrosivity, toxicity
Label the variables: A given mass of air has a volume of 6.90 L at 273K, what is the new volume if the temperature is decreased to 240K?
V1 = 6.90L; V2 = ?; T1 = 273K; T2 = 240
List three intensive properties…
Color, density, reactivity, state of matter, ect.
A sample of calcium has a mass of 80 g, how many moles are present
2 moles ca
According to Kinetic molecular theory as temperature increases pressure increases because the particles move _________ colliding with the wall of the container _________ frequently.
Faster, more
What is the volume of a balloon that contains 2 moles of carbon at 3 atm and 400 K?
21.89 L
I’m finding the density of 3.2 g of metal with a volume of 1 cm3, what will the unit be?
g/cm3
List three extensive properties
Mass, volume, length
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
2 L of a 6 M solution of NaOH is made with how many moles?
12 mol
Why does increasing the surface area of a solute increase the rate of dissolving?
It increases the chance for collisions to happen.
6.02 x 1023 represents the number of atoms in 1 ____.
moles.
Why can intensive properties be used to identify a substance?
They do not change based on amount
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.
When a small volume of water is boiled, a large volume of steam is produced. Why?
The molecules are further apart for the steam
I have a piece of metal with a specific heat of 0.35 J/g℃ and a brick with a specific heat of 1.13 J/g℃. Which one will heat up to 100℃ with less energy and why?
The metal will, because it has a lower specific heat, meaning it takes less energy to heat it up to the same temperature.
Which has more mass? 2 moles of Iron (Fe) or 2 moles of Zinc (Zn)?
2 moles of Zinc