Atomic Structure
Name the three main subatomic particles.
protons, neutrons, electrons
The periodic table arranges elements by increasing what?
atomic number
In a CER response, what is the part that states the main conclusion?
Response
How do you calculate the mean of a data set?
add up and then divide by the number you added
A student measures a rock four times: 45 g, 46 g, 44 g, 45 g. What is the mean mass?
45g
Where are protons and neutrons located in an atom?
nucleus
What are the horizontal rows on the periodic table called?
periods
Which part of CER lists observations or data that support the claim?
evidence
What is the median of the numbers 5, 7, 9, 11, 13?
9
Using the mean from the previous question and a volume of 20 cm³, calculate the density.
45/20 = 2.25
What does the atomic number tell you about an atom?
the number of protons and electrons
Elements in the same group generally share what type of properties?
chemical
What is the role of reasoning in a CER response?
to explain how the evidence supports your claim
Define "outlier" and state which measure (mean or median) it usually affects more.
data that is outside the norm. it usually affects mean more.
A data set is 8, 12, 10, 12, 8. If 15 is added, what is the new mean? (Show work)
65/6 = 10.83
Calculate the mass number of an atom with 8 protons and 9 neutrons.
17
Group 1 elements tend to do what with their outer-shell electrons?
Lose them
Identify the claim, evidence, and reasoning in this short example: "Element X is a highly reactive metal; it is shiny, conducts electricity, and reacts vigorously with water; these observations are properties associated with metals."
claim: element x is a highly reactive metal
evidence: shiny, conducts electricity and reacts vigorously with water
reasoning: because element x demonstrates properties associated with metals and reacts vigorously with water, it is a highly reactive metal
If a rock has mean mass 45 g and volume 20 cm³, calculate its density (show the equation).
45/20= 2.25
A data set is 8, 12, 10, 12, 8, 15. What is the median?
8,8,10,12,12,15 = 11
A neutral atom has 12 protons. How many electrons does it have and why?
12 because you must have an equal number of protons and electrons to cancel each other.
How can an element’s position on the periodic table help scientists predict its chemical properties?
it gives you chemical properties
Explain why strong scientific arguments need both relevant evidence and scientific principles.
varies
When reading a graduated cylinder, where should your eye be positioned and what part of the meniscus do you read? Explain why.
you read from the bottom of the meniscus. If you are not looking straight at the meniscus, you will be inaccurate.
Describe the three parts you must show in a complete multi-step scientific solution and why each part is important. Provide a brief example that uses mean, median, and a CER conclusion.
varies