Nature of Science
What is qualitative data?
Data collected through observations
What phase change is melting?
Solid to liquid
What is an atom?
The smallest unit of matter.
How many groups are in the periodic table?
How many periods are in the periodic table?
18 groups
7 periods
What is an inference?
A conclusion made based on observations.
What phase change is condensation?
Gas to liquid
What are the three subatomic particles?
Proton, neutron, electron.
What is the name of the largest group of elements on the periodic table?
Transition metals
Sam developed the following hypothesis for his science project: The speed of a skateboard rolling downhill is greater on steep hills than on flatter hills. How can Sam BEST test this hypothesis?
A - Push the skateboard with varying force down inclines set at different angles and measure the force with which the skateboard hits the wall.
B - Push the skateboard with varying force down inclines set at different angles and measure the distance traveled each time.
C - Roll the skateboard down a single incline, and measure the force with which it hits the wall.
D - Roll the skateboard down inclines set at different angles, and measure the time it takes to roll the same distance each time.
D - Roll the skateboard down inclines set at different angles, and measure the time it takes to roll the same distance each time.
Describe the change the energy of particles undergo when changing from a liquid to solid.
They slow down.
What's found in the nucleus of an atom?
Protons and neutrons
What is the name of the group of elements in the far left column, excluding hydrogen?
Alkali metals
What would be the independent variable in this scenario:
Sasha keeps her pet snake in an aquarium. Sasha has just completed an investigation to test how the strength of the light bulb she uses in the aquarium affects how much the snake eats.
Strength of the light bulb
What is deposition? Do the particles get closer or father apart?
Phase change of going from a gas to a solid.
Closer together.
What is included in the atomic mass?
Number of protons and neutrons.
What happens to the atomic radii as you move down groups?
They increase/get bigger.
Lillian decides to carry out a controlled experiment while on vacation. Which of the following projects fits the definition of a controlled experiment?
A - Comparing sunscreens by applying three different brands to the same size area of skin on the arm, leaving one area bare. The arm is exposed to the Sun for the same amount of time and the areas compared.
B - Determining the average number of starfish that wash onto the beach each day, tagging each starfish to avoid double-counting.
C - Measuring the frequency of the tide at the same location for one week, using a stopwatch with precision of a hundredth of a second.
D - Finding the number of unique organisms that inhabit a square meter of the beach, using a randomly selected square.
A - Comparing sunscreens by applying three different brands to the same size area of skin on the arm, leaving one area bare. The arm is exposed to the Sun for the same amount of time and the areas compared.
DOUBLE JEOPARDY: What is sublimation? Then describe the energy changes of sublimation.
Sublimation: change from solid to gas.
Particles' energy becomes fast very quickly.
How are isotopes and ions created?
Isotopes: more or less neutrons than protons
Ion: more or less electrons than protons
What is a valence electron?
The electrons in the outermost orbit.