Concept 1
A student observes that a solution is bright blue. Is this a qualitative or quantitative observation?
Qualitative
Convert 5,000 mg → g.
5 g
Which type of property does NOT depend on how much matter you have: intensive or extensive?
Intensive
A substance has an indefinite shape but a definite volume. What state of matter is it?
Liquid
A balance gives the measurements 15.21 g, 15.22 g, and 15.21 g. The accepted value is 20.00 g. Are these measurements precise, accurate, or both?
Precise but not accurate
Convert 2.5 L → mL.
2,500 mL
Mass, volume, and length are all examples of this type of property.
Extensive properties
Which of these is a chemical property?
A. Density
B. Melting point
C. Flammability
D. Color
C — Flammability
A metal has a mass of 36 g and a volume of 12 mL. What is its density?
3 g/mL
Write 3.25 × 10⁻³ in standard notation.
0.00325
Ice melts into liquid water. Is this a physical change or a chemical change?
Physical change
A student measures 24.0 g of a substance with a volume of 6.0 mL. What is its density?
4.0 g/mL
A student measures 18.0 mL when the accepted value is 20.0 mL. Calculate the percent error.
10%
Write 45,600,000 in scientific notation.
4.56 × 10⁷
A piece of wood burns and produces ash, smoke, and gases. What type of change occurred, and what is one clue that tells you this?
Chemical change. A new substance was produced. acceptable clues=include gas production, color change, temperature/light production, or formation of a new solid.
A student says, "An element and an atom are the same thing." Explain why this statement is incorrect.
An atom is a single unit of an element, while an element is a pure substance made of only one type of atom.
A student wants to know whether the amount of time spent studying affects test scores. Identify the independent variable, dependent variable, and one constant.
Convert 2.75 km → mm using dimensional analysis. Show your setup.
2,750,000 mm or 2.75 × 10⁶ mm
A student mixes sand and water. The sand settles to the bottom, and you can see the different substances. Is this homogeneous or heterogeneous?
Heterogeneous
A scientist studies how temperature affects how quickly sugar dissolves in water.
Identify: