Precision Instruments
This term describes how close a measurement is to the true or accepted value — different from precision, which describes how close repeated measurements are to each other.
What is accuracy?
Convert 1,800 millimeters to centimeters.
What is 180 cm?
Write 801,000 in scientific notation.
What is 8.01 × 10⁵
This term describes a pure substance made of only one type of atom
What is an element?
This category of property can be observed without changing the substance's identity, such as color, melting point, or density.
What is a physical property?
These are the SI base units for mass, length, and temperature, in that order. |
What are the kilogram, meter, and kelvin?
Convert 4.9 kiloseconds to seconds.
What is 4,900 s?
Write 0.0518 in scientific notation.
What is 5.18 × 10⁻²?
This term describes a mixture with uniform composition throughout, such as salt fully dissolved in water.
What is a homogeneous mixture (a solution)?
This type of property depends on the amount of substance present, such as mass or volume — unlike an intensive property, which does not.
What is an extensive property?
State the number of significant figures in the measurement 7,102.0 grams.
What is 5?
Convert 21 days into seconds.
What is 1,814,400 seconds?
Write 7.008 × 10⁶ in standard notation.
What is 7,008,000?
A mixture of oil and vinegar that separates into visible layers is an example of this type of mixture.
What is a heterogeneous mixture?
Name two observable signs that suggest a chemical reaction has likely occurred.
Any two of: color change, gas/bubble formation, temperature change, precipitate formation, odor change
In an experiment testing how the amount of fertilizer affects plant height, name the independent variable and the dependent variable.
What are amount of fertilizer (independent) and plant height (dependent)?
Using 1 lb ≈ 453.6 g, convert 9,602 grams into pounds.
What is about 21.2 lb?
Write 5.04 × 10⁻⁴ in standard notation.
What is 0.000504?
Explain the key difference in composition between a compound and a mixture, and give an example of each
A compound's parts are chemically bonded in a fixed ratio (e.g., water, H₂O); a mixture's parts are physically combined in variable proportions (e.g., trail mix).
A piece of plastic with a mass of 15 g is placed in a graduated cylinder. The water level rises from 32 mL to 52 mL. Find the density of the plastic.
What is 0.75 g/mL?
A student measures the boiling point of water three times, getting 99.1°C, 99.3°C, and 99.2°C, when the true value at sea level is 100.0°C. Describe this data set in terms of accuracy and precision.
What is precise, but not accurate?
Convert 275°F to Kelvin.
What is about 408 K?
Multiply (3.2 × 10⁴) × (2.0 × 10⁻²) and express the result in proper scientific notation.
What is 6.4 × 10²?
Steel, a solid solution of iron and carbon, looks uniform to the naked eye and is classified as this type of mixture.
What is a homogeneous mixture (an alloy)?
Explain why the total mass of the reactants equals the total mass of the products in a chemical reaction, and name the law involved.
The Law of Conservation of Matter — atoms are rearranged but never created or destroyed, so total mass stays the same.