Atomic Structure & PT
What part of the atom has a positive charge?
Answer: Proton
What state of matter has a definite shape and volume?
Answer: Solid
Solve:
x + 7 = 15
Answer: x = 8
Is 0 a whole number, integer, or natural number?
Answer: Whole number and integer (not natural)
Solve:
2(x + 4) = 18
Answer: x = 5
How many electrons can the third energy level hold in a Bohr model?
Answer: 18
Is melting butter a physical or chemical change?
Answer: Physical change
Solve:
3x = 21
Answer: x = 7
Convert: 7/4 to a mixed number
Answer: 1 3/4
An atom has 12 protons and 10 electrons.
Answer:
Magnesium; cation
What family of elements is found in the first column of the periodic table (excluding hydrogen)?
Answer: Alkali Metals
What is the independent variable in an experiment?
Answer: The variable you change
2x + 5 = 13
Answer: x = 4
Add: 1/2 + 3/4
Answer: 1 1/4
How many total atoms are in:
Ca(O₂H)₂
Answer: 7 atoms
An atom has 8 protons, 8 neutrons, and 10 electrons. What is it classified as?
Answer: Ion (specifically a negative ion)
How is an isotope different from another atom of the same element?
Answer: Different number of neutrons
Write an equation: “A number decreased by 6 equals 10”
Answer: x - 6 = 10
Classify: -5
Answer: Integer and rational number
A student observes bubbles forming during a reaction.
Answer:
Chemical change; gas formation
An atom has 15 protons, 16 neutrons, and 18 electrons.
Answer: Phosphorus; it is an ion (negative ion)
A student measures how sunlight affects plant growth. What is the dependent variable?
Answer: Plant growth
Solve:
4x - 3 = 2x + 9
Answer: x = 6
Simplify:
3(2x + 4) - 5
Answer: 6x + 7
Solve and classify:
-3 is what type(s) of number? (name ALL that apply)
AND
Solve: 3(x - 2) = 9
Answer:
Integer and rational; x = 5