Unit 1: Sci Method/Basics
What is the equation for calculating density?
What are the 4 states of matter?
Solid, liquid, gas, plasma
What subatomic particles are in the nucleus?
Protons and neutrons
Barium (Ba)
What is the independent variable in this statement?
If I create a cheat sheet for my chemistry midterm, then I will get a better grade on my midterm.
Creating a cheat sheet
The water is 78 degrees.
Is this QUALITATIVE or QUANTITATIVE. Why?
Quantitative, gives a measured value
What state of matter takes the shape of the container and always fills the container?
How many protons, neutrons, and electrons are in F?
9 p, 10 n, 9 e
How many valence electrons does Aluminum have?
3
What two things are required for something to be considered matter?
Mass and volume
What are the 5 steps of scientific method (in order)?
Question, Hypothesis, Experiment, Analysis, Conclusion
What is the difference between an element and a compound?
Elements are single atoms, compounds are 2+ atoms/elements
How many protons, neutrons, and electrons are in Sn4+?
50 p, 69 n, 46 e
How many valence electrons does a noble gas have?
8
Complete the following nuclear reaction:
70,31 Ga --> _____ + 4,2 A
66,29 Cu
What is the difference between accuracy and precision?
Accurate = getting it right
Precise = consistent results
The slime is green.
Is this INTENSIVE or EXTENSIVE?
Intensive
How many protons, neutrons, and electrons are in 212Bi?
83 p, 129 n, 83 e
Which ion will be larger - Cu2+ or Cu3+? Why?
Cu2+, it has only lost 2 electrons instead of 3
The half life of an element is 2.3 hours. How much of 133 gram sample will be left after 9.2 hours?
8.31 grams
A 61.2 gram diamond is dropped into a cylinder of water containing 15 mL of water. The water level rises to 22.3 mL after the diamond is added.
What is the density of the diamond?
8.38 g/mL
Which of the following is NOT a chemical change?
1. Rust forming.
2. Fireworks exploding.
3. Ice melting.
4. Steak cooking.
5. Food digesting.
3 - ice melting
Who discovered the nucleus and what was the name of his experiment?
Rutherford - gold foil experiment
What is special about group 18 (noble gases)?
They are not reactive because they are stable with 8 valence electrons.
Given the info below, calculate the average atomic mass of the element AND identify the element.
50X = 4% abundant
52X = 84% abundant
53X = 10% abundant
54X = 2% abundant
(HINT: Think 3 steps to find average mass, don't forget unit!)
52.06 amu, Chromium (Cr)