Variables
Which two variables are stated in a hypothesis?
Independent and Dependent Variables
What is an inference you could draw from the following observation, "everyone is wearing jackets."
It's cold
Calculate the average of the following measurements: 70 g, 72 g, 80 g, 65 g.
71.75 g
What is an element?
Pure, most simple substance. Something you could find on the periodic table.
ex: Oxygen, Iron, etc.
Give an example of an extensive property of matter.
Length, mass, volume, weight
Which variable is responding to an intentional change; the variable the scientist is measuring?
Dependent Variable
Jaime wants to create a graph displaying how tall he was at 12, 13, 14, 15, and 16 years old. Which type of graph would be best to display this data?
Line graph
How many sig figs are in the measurement 0.029800 mg?
5
How many atoms are in C6H12O6?
24 atoms
Give an example of a chemical property of matter.
Reactivity, flammability, or ability to rust
Which variable is intentionally changed by the experimenter?
Independent Variable
Determine if the following measurements are accurate, precise, both, or neither. Actual value = 5.5 cm
Student measurements: 3.7 cm, 12.6 cm, and 1.5 cm
Neither
What is 493.5 K in degrees Celsius?
220.35 degrees Celsius
Explain the difference between a mixture and a substance.
Mixtures can be physically separated. Substances cannot.
Provide a sign of a chemical change occurring.
What term is used to describe variables that are kept the same across every trial?
Constants
Rahul is doing an egg drop experiment. The plain egg dropped from the roof of the school breaks, as well as the egg with paper wrapped around it. The egg wrapped in bubble wrap with a mini-parachute does not break. What would be an example of a hypothesis that supports Rahul's findings?
If an egg is dropped from the roof with more protection, then it will not break.
On average, there are 3 pages in every chapter of a James Patterson novel. Each book has approximately 79 chapters. James Patterson has published 58 books. Approximately how many pages has James Patterson written?
13,746 pages
How would you classify pure air? Element, compound, homogeneous mixture, or heterogeneous mixture?
Homogeneous mixture
Is sugar dissolving in water a physical or chemical change?
Physical change
Find the independent and dependent variables in the following hypothesis: If you increase the amount of time spent studying, then student test scores will improve.
IV: amount of time studying
DV: student test scores
You are asked to analyze a classmate's experiment for a project. Upon investigation, you realize they do not have a control group. Why is this a problem?
Control groups give you something to compare your results to. Otherwise, you do not know if your independent and dependent variables actually interacted.
The heartbeat rate for a typical adult is about 70 beats per 1 minute. How many beats would that amount to in one year?
36,792,000 beats
How would you describe a gas?
No definite shape or volume
How does burning something not disobey the law of conservation of mass?
Gases like CO2 are released