Accuracy & Precision
How close a measured value is to the true or accepted value.
What is accuracy?
Zeros located between non-zero digits (e.g., $101$) are always considered to be this.
What are significant?
When adding or subtracting, your final answer must be rounded to match the value with the fewest of these.
What are decimal places?
The method of using conversion factors and cancelling units to convert from one unit to another.
What is dimensional analysis (or the factor-label method)?
The formula used to convert a temperature from Celsius to Kelvin.
What is K = C + 273.15 (or + 273)?
How close a series of measurements are to each other, regardless of whether they are correct.
What is precision?
How many significant figures are in the number 0.0045?
What is 2?
When multiplying or dividing, your final answer must be rounded to match the value with the fewest of these.
What are total significant figures?
The mathematical formula used to calculate percent error.
What is Experimental - Accepted\Accepted x 100%?
Convert 25 C to Kelvin.
What is 298.15 K (or 298 K)?
A student shoots three arrows and they all hit the top-right edge of the target, far away from the bullseye. Describe their accuracy and precision.
What is low accuracy and high precision?
How many significant figures are in the number 120.00?
What is 5?
Solve 12.11g + 0.3 g and express the answer with correct significant figures.
What is 12.4 g?
Convert 500 mL to liters (L).
What is 0.5L?
Convert -40 C into Fahrenheit
What is -40 F?
Measuring a 50.0 g standard weight three times yields 41.1 g, 41.2 g, and 41.0 g. Describe these results.
What is precise but not accurate?
Trailing zeros in a number without a decimal point (e.g., 2,500) are classified as this.
What is non-significant (or placeholders)?
Solve 4.50 cm x 2.0 cm and express the answer with correct significant figures.
What is 9.0 cm^2?
A student experimentally finds the density of water to be 1.05 g/mL. The accepted value is 1.00 g/mL. Calculate the percent error.
What is 5%
Write the exact formula used to convert a temperature in Fahrenheit to Celsius.
C = (F - 32) /(1.8)
A bullseye target has four darts grouped tightly together, but all four are stuck in the outer ring far from the center. Identify whether this demonstrates high or low accuracy, and high or low precision.
What is low accuracy and high precision?
How many significant figures are in the value 0.005080 kg?
What is 4 significant figures?
Perform the following calculation and round to the correct number of significant figures: 3.225 cm x 0.040 cm.
What is 0.13 cm^2?
An experiment yields a measured mass of 2.40 g, but the actual accepted mass is 2.50 g. Calculate the percent error.
What is 4.00%?
A sample of liquid nitrogen is stored at 77 K. What is this temperature in degrees Fahrenheit?
What is -321.07 F (or -321F)?