Lesson 1-2
Lesson 2
Lesson 3
Lesson 4
100
What is the difference between Mass & Weight?
Mass is the amount of matter in an object and it never changes, despite change of location.
Weight is the force of gravity on the object and it does change based on location.
100
What are the 7 base units?
1. Time (s) - seconds
2. Length (m) - meters
3. Mass (kg) - kilogram
4. Electric Current (A) - ampere
5. Temperature (k) - kelvin
6. Amount (mol) - mole
7. Luminous Intensity (cd) - candela
100
Using Accuracy & Precision, describe this dartboard:
High Accuracy, Low Precision
100
What is the difference between independent vs. dependent?
Independent - Something you can change in an experiment
Dependent - Response depends on the independent variable
200
How many significant figures are in this number:
0.0050700
5 significant figures
0.0050700
200
Which is warmer?
32° C or 32° F
32°C
200
What is the error equation?
error = experimental value - accepted value
200
Identify the independent and dependent variable:
A student studies whether the amount of exercise affects a person's heart rate.
IV = amount of exercise
DV = heart rate
300
A metal sample has a mass of 45.0 g and a volume of 15.0 mL.
What is the density of the metal in g/mL?
density = mass / volume
density = 45.0 g / 15.0 mL
density = 3.00 g/mL
300
Convert to Scientific Notation:
92,100
9.21 x 104
300
What is the main difference between Accuracy & Precision?
Accuracy measures how close a measured value is to an accepted value, while precision measures how close a series of measurements are to one another
300
A class compares the average test scores of four different chemistry classes. Which graph would be best?
Bar Graph
400
Convert to Expanded/Standard Form:
9.1×10−6
0.0000091
400
Convert 5.0 pounds (lbs) to ounces (oz)
1 lb = 16 oz
5.0 lbs (16 oz /1 lb) = 80 oz
400
A student measures the density of a substance as 2.8 g/mL. The accepted density is 3.0 g/mL.
Calculate for Error
2.8 g/mL - 3.0 g/mL = -0.2
400
Identify if this is interpolation vs. extrapolation:
A student measures the solubility of sugar at temperatures from 20°C to 80°C. They use their graph to predict the solubility at 50°C.
Interpolation — 50°C is inside 20–80°C
500
Give me the calculator result and the correct reported result:
125.0+6.78−2.345= ?
Calculator Result: 129.435
Reported Result: 129.4
500
Convert 2.5 miles to inches
1 mile = 5,280 ft 1 ft = 12 in
Step 1: miles -> ft
2.5 mi (5280 ft / 1 mile) = 13,200 ft
Step 2: ft -> inches
13,200 ft (12 in / 1 ft) = 158,400 inches
500
A student measures the density of a substance as 2.8 g/mL. The accepted density is 3.0 g/mL.
Calculate for percent error
Step 1: Calculate for Error
2.8 g/mL - 3.0 g/mL = -0.2
Step 2: Calculate for Percent Error
= |-0.2/3.0| x 100
= 0.0667 x 100
= 6.7%
500
A student plots a graph and chooses two points on the best-fit line: (2,5) & (6,13)
What is the slope of the line?
m = 13 - 5 / 6 - 2 = 8 / 4
m = 2