Matter & Definitions
Define "matter." Give one everyday example.
What is anything that has mass and takes up space?
Example: water.
Which variable does this statement represent: the variable that a scientist changes?
What is Independent Variable?
Why do scientists use scientific notation?
What is to condense very large or very small numbers and make calculations easier?
What type of graph is best for showing parts of a whole (percentages)?
What is pie chart?
What is the formula of density?
What is D=m/V?
What is the difference between a scientific theory and a scientific law?
What is (Theory) an explanation based on many observations and investigations; (Law) a description of a relationship in nature supported by experiments?
In an experiment testing sunlight and plant growth, what is the dependent variable?
NOT the definition. Which variable is dependent?
What is plant growth?
Write 3.8 x 10^6 in standard decimal form.
What is 3,800,000?
When would a line graph be more appropriate than a bar graph?
What is when showing continuous change over time or trends between measurements?
A sample has density 7.86 g/cm^3 and volume 7.3 cm^3. Calculate the mass. Round to two significant figures.
What is 57 g?
Define "substance" and explain how it differs from a mixture
What is (Substance) matter with a definite and uniform composition (pure); (Mixture) two or more substances physically combined?
A student repeats an experiment and finds the same numerical relationship every time. Does this support a law, a theory, or both?
What is a law?
Convert 0.00371 to scientific notation.
What is 3.71 x 10^-3?
Give two features that make a graph clear and scientifically useful.
What are: clear axis labels with units, data, lines, title, and an appropriate scale?
Convert 0.754 kg into grams.
What is 754 g?
Define "mass" and "weight." Explain why mass is the better quantity to compare amounts of matter between Earth and the Moon.
What is Mass is the amount of matter (measured in g or kg); weight is the force from gravity on that mass; Mass is constant regardless of location, so it's better for comparison?
A student measures: 12.41 g, 12.43 g, 12.42 g. Accepted value 13.10 g. Accurate, precise, both, or neither?
What is precise?
For 0.00620 g, how many significant figures?
What is 3?
A data set changes over time; describe how you would display this data?
What is a line graph?
Explain how to measure the density of an irregular solid in the lab. Hint: Think Penny Lab/Washers.
What is displacement?
What is the difference between accuracy and precision?
What is (Accuracy) how close a measured value is to an accepted value and (Precision) how close repeated measurements are to each other?
Describe a simple experiment to test how salt amount affects the boiling point of water. Say the independent variable, the dependent variable, and one thing you would keep the same in every trial.
What is Independent variable: amount (concentration) of salt, Dependent variable: boiling point temperature of the water, One controlled variable: the volume of water used in each trial (e.g., always 100 mL)?
How many significant figures are in 0.009350?
What is 4?
You measured how much salt dissolves at 10°C (28 g), 20°C (35 g), and 30°C (43 g). Which graph would you use to show this trend, what would you label the x- and y-axes?
What is Use a line graph, x-axis label: Temperature (°C), y-axis label: Solubility (g per 100 mL)?
Densities recorded: 3.42, 3.45, 3.48 g/cm^3. Accepted = 3.45 g/cm^3. Do results show accuracy, precision, both, or neither?
What is accurate and precise?