Measuring Length
Convert 0.5 kilometers to meters
What is 750 meters (m)?
What instrument would you use to measure the mass of a powder sample to the nearest gram?
What is a Digital Scale?
What unit would you use to report the volume of a beaker that holds water in a lab: mL or L?
mL for typical beaker volumes under 1 L because smaller unit gives better precision
What is the freezing point of water in degrees Celsius?
0 degrees Celcius
What is the correct order of the basic steps of the scientific method from hypothesis to conclusion? List in sequence.
Ask a question, Research, Form a hypothesis, Experiment (test), Collect/analyze data, Draw conclusion, Communicate results
A pencil is 18.4 cm long. Express this length in millimeters.
What is 184 millimeters (mm)?
Convert 3.2 kilograms to grams.
What is 3,200 grams (g)?
Convert 2.5 liters to milliliters.
2,500 mL
Convert 25°C to kelvins.
298 K
Define a hypothesis and give a concise example related to how temperature affects dissolving rate.
Hypothesis: an informed, testable prediction. Example: "If water temperature increases, then sugar will dissolve faster because higher temperature increases molecular motion."
Which tool is best for measuring the length of a classroom and why?
What is a meter stick or tape measure?
Explain why mass does not change when you travel from Earth to the Moon.
Mass is amount of matter; gravity change does not alter the amount of matter.
A cube has side length 4 cm. Calculate its volume in cubic centimeters.
64 cm³
A thermometer reads 310 K. Convert this to degrees Celsius
37 degrees Celcius
You run an experiment twice and get different results. List three actions you should take to evaluate and improve the experiment's reliability.
Repeat trials, check equipment calibration, examine procedure for uncontrolled variables, compute averages and uncertainty.
2.5 meters (m) to centimeters (cm)
What is 250 centimeters (cm)?
Convert 5,400 grams to kilograms and show the calculation steps.
5.4 kg (5400 g ÷ 1000 = 5.4 kg)
You add an object to 45 mL of water and the level rises to 62 mL. What is the object's volume?
17 mL
(Extra Credit) Explain why scientists often use kelvins instead of Celsius when reporting temperatures in scientific work.
Kelvins start at absolute zero and avoid negative values
What is a Independent variable and a Dependent variable
Independent variable: the one you change on purpose. Dependent variable: what you measure or observe that may change.
A rectangular field is 120 m by 80 m. If you must mark a straight path across the diagonal, what is the diagonal length? (a squared + b squared =c squared)
What it 20800 m?
A chemical reaction in a closed system has reactants totaling 24.6 g. After reaction, products total 24.6 g. Name the conservation principle this demonstrates and why it matters in measurements.
Law of conservation of mass — mass is conserved in closed systems; measurements should reflect that.
A rectangular box measures 10 cm × 5 cm × 8 cm. Compute its volume and explain which unit is appropriate.
Volume = 10 × 5 × 8 = 400 cm³ (unit: cubic centimeters)
In an experiment you measure boiling water at 98°C instead of 100°C. List three possible sources of error related to measurement and explain how each could cause the lower value.
Thermometer calibration error; not at standard atmospheric pressure; heat loss during transfer; explain how each lowers measured boiling point.
Which measurement is hardest for you?
This is a reflection question...