Unit 1: Measurements
Unit 2: Matter
Heat and Energy
Unit 3:Atomic Concepts
Nuclear Chemistry
100
How many significant figures are in 350.2500?
7
100
Nathaly left her bicycle in the rain over night. The bicycle formed brown brittle spots. is this a chemical or physical change?
chemical change.
100
What phase of matter the substance at line CD?
liquid
100
What is the charge, mass, and location of a proton
Positive charge, mass: 1 amu, located in Nucleus
100
What is the decay mode of Strontium-90?
beta decay
200
Convert 300 celsius to Kelvin
K= C + 273
K= 300+273 = 573K
200
What type of matter is BrCH2OH considered?
compound
200
Draw what the particles look like at line EF
200
How many protons and neutrons are in Au-198
79 Protons, 119 neutrons
Mass # = p + n
200
Which nuclear emission has no charge and no mass?
Gamma
300
Calculate 12.25 x 3.50. Round your answer in the correction number of significant figures.
42.9
answer in 3 sig figs
300
What type of matter is NaCl(aq)?
mixture
300
explain in terms of kinetic and potential energy what is happening in line BC.
Kinetic energy is constant,
Potential energy is increasing.
300
An atom in an excited state has an electron configuration of 2-6-3. Write the electron configuration of this atom in the ground state.
2-8-1
300
Compare the a fusion reaction to a fission reaction.
Fusion is when two smaller nuclei fuse to one bigger nucleus.
Fission is when a large nucleus is split into two or more smaller nuclei.
400
Emma who weighs 100 pounds, found a rock. What is the volume of the rock if it has a mass of 42g and a density of 7g/cm^3?
6cm^3
D=m/v, v=m/D
v=42/7
400
Explain the difference between a homogeneous and a heterogeneous mixture.
Homogeneous is when the substance looks the same. even distribution.
Heterogeneous is when there are different layers. Uneven distribution.
400
how many joules is required to melt 450g of ice at 0 degrees celsius?
150300 J
q=mHf
q=(450)(334)
400
What are the two conclusions of the gold foil experiment?
1. atoms are made mostly of empty space
2. atoms have a small, dense, positive center called the nucleus.
400
Write the nuclear equation for the decay of Rn-222.
500
There are 5.75 grams of sugar in Celeste's cookie. You determine the sugar content to be 4.0 grams in a lab. What is the percent error?
30%
500
Explain how you would separate sand, salt, and water using chemical separation techniques.
use filtration to separate the sand from the salt water. use evaporation to separate salt from the water.
500
Heat is added to a 200.-gram sample of H2O(s) to melt the sample at 0°C. Then the resulting H2O(ℓ) is heated to a final temperature of 65°C. Calculate the total amount of heat required to raise the temperature of the H2O(ℓ) from 0°C to its final temperature.
Q=mcΔ T
Q=(200)(4.18)(65)
Q=54340J
500
Explain in terms of electrons and energy levels how the light emitted from a flame is produced
when electrons in an excited state fall down to a lower energy level, light is produced.
500
If original there was 96.0g of Krypton-37, how much Krypton-42 remains after 6.15 seconds?
3 grams