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 liquid has a density of 2.5 g/mL and a volume of 18 mL. What is its mass?
45g
How many sig figs are in 0.00450?
3
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
Water begins at 31.5 mL in a graduated cylinder and rises to 38.0 mL when a metal object is added. What is the object's mass if it's density is 2kg/mL?
13kg
Write 0.000064 in scientific notation
6.4x10^-6
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 piece of aluminum has a density of 2.70g/mL and a volume of 0.350L. What is its mass in g?
945g
Convert 18.0m/s to km/hr
64.8km/hr
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 cylinder has a density of 8.40g/mL and a mass of 3.36kg. What is its volume in liters?
0.400L
Experimental density = 4.86 g/cm^3
Accepted density = 5.00 g/cm^3
What is the percent error?
2.8%
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 should've been a controlled variable
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 sample of an unknown liquid has a mass of 4.25x10^5mg and has a volume of 0.250L. What is it's density in g/mL?
1.70g/mL
A team has 1.75 gallons of sports drink. How many tablespoons of sports drink is this?
448 Tbsp