DENSITY CONCEPTS
What is the formula used to calculate density?
Density = mass ÷ volume
Convert 4.75 kg to grams.
4,750 g
What group provides a comparison?
Control group
Something directly seen or measured is called what?
Observation
What format should a hypothesis use?
If–Then
A block has a mass of 180 g and a density of 6 g/cm³. What is its volume?
30 cm³
0.035 L to milliliters.
35 mL
Why should only one independent variable be changed?
Identify cause
A student records that a liquid is blue. What is this?
Observation
What should happen if results do not support a hypothesis?
Revise hypothesis
A liquid has a density of 1.5 g/mL and a volume of 80 mL. What is its mass?
120 g
Convert 0.0028 L to microliters.
2,800 µL
Why are controlled variables important?
Fair test
A student sees a wet sidewalk and says it rained. What is “it rained”?
Inference
A scientist's results contradict the hypothesis. Does this automatically mean the experiment failed?
No
A rock has a mass of 210 g. Water rises from 35 mL to 65 mL when the rock is placed in the cylinder. What is the rock's density?
7 g/mL
Convert 850,000 µg to kilograms.
0.00085 kg
Why are multiple trials useful?
Increase reliability
The student concludes that a chemical reaction caused the solution to become cloudy. What is this?
Inference
Why shouldn't a scientist change data to make it support the hypothesis?
Scientific bias
A metal cube has a mass of 540 g and measures 6 cm × 5 cm × 3 cm. What is its density?
6 g/cm³
A chemical sample has a mass of 0.0000042 kg. Express the mass in micrograms.
4,200 µg
A student tests one plant with fertilizer and one without. Why would adding more plants improve the experiment?
Larger sample
A scientist says a reaction produced a gas because bubbles appeared. What part requires additional evidence?
Gas produced
A scientist repeats an experiment and gets the same unexpected result. What might they need to do?
Revise hypothesis