Scientific Communication
A student writes, "The liquid turned from clear to green." Is this an observation or inference?
Observation
What unit do we measure temperature in?
Celsius
What is the curved surface of water inside a graduated cylinder called?
Meniscus
A piece of plastic has a density of 0.85 g/cm³. If placed in water, will it float or sink?
Water has a density of 1.0g/cm^3
Float
Write 0.00093 in scientific notation.
9.3 × 10⁻⁴
A student records, “The reaction lasted 36.2 seconds.” Is this qualitative or quantitative data?
Quantitative
Where do you go if you get acid in your eyes?
Find a sink (eyewash station doesn't work)
A digital balance displays 14.382 g. How should the measurement be recorded?
14.382g
A rock has a mass of 63 g and a volume of 9 cm³. What is its density?
7 g/cm³
Convert 4.6 L to mL.
4,600 mL
A student tests whether the amount of fertilizer affects the height of bean plants after 3 weeks.
Give two variables that should be controlled
Answers vary
You need to measure 26.5 mL of liquid accurately. What piece of equipment should you use?
Graduated Cylinder
The accepted mass is 20.0 g. A group measures 18.3 g, 18.4 g, and 18.3 g. Are the results accurate, precise, both, or neither?
Precise
A liquid has a density of 1.8 g/mL and a volume of 25 mL. What is its mass?
45 g
Convert 0.028 kg to mg.
28,000 mg
A student tests whether the amount of soap affects the size of bubbles produced. What is the dependent variable?
Bubble size
What glassware is good for heating liquids in approximate amounts?
Beaker
A graduated cylinder has markings every 1 mL. The liquid is a little more than halfway between 42 and 43 mL. About what precision should the measurement be recorded to?
Nearest 0.1mL. Example: 42.6mL
A metal sample has a mass of 96 g and a density of 8 g/cm³. What is its volume?
12 cm³
Write 56,000,000,000 in scientific notation.
5.6 × 10^10
A student tests whether surface area affects reaction time. They use one whole tablet in 100 mL of cold water and one crushed tablet in 200 mL of warm water. Why can't they conclude that surface area caused the difference?
Water temp and amount should've been controlled variables
What tool do you pick up chemicals with when measuring?
Scoopula
What is the volume of a rock (in cm^3) if it is put into a graduated cylinder that read 12mL before the rock was added, and 13.5mL after being added?
1.5cm^3
A metal bolt raises the water level in a graduated cylinder from 42 mL to 57 mL. The bolt has a mass of 117 g. What is its density?
Volume = 15 cm³; Density = 7.8 g/cm³
Convert 3.2 kg to mg.
3,200,000 mg or 3.2 × 10⁶ mg