Scientific Measurement
What type of observation uses descriptions instead of numbers?
Qualitative observation
Which state of matter has definite volume but no definite shape?
Liquid
Which of the following is a chemical change: melting ice or burning wood?
Burning wood
What variable is purposefully changed in an experiment?
Independent variable
Convert 292 K to °C.
19°C
How many significant figures are in 0.0103 mL?
3
Write 6,700,000 in scientific notation.
6.7 × 10⁶
What tool is used to measure liquid volume?
Graduated cylinder
A mixture that looks uniform throughout is called a _____ mixture.
Homogeneous
What happens to the molecules in a physical change?
They rearrange but do not form new substances
What is measured or observed in an experiment?
Dependent variable
Convert 36°F to °C.
1°C
How many significant figures are in 760 mmHg?
2
Write 0.000312 in scientific notation.
3.12 × 10⁻⁴
How many significant figures are in 0.0103 mL?
3
What do we call a property that depends on the amount of matter present?
Extensive property
Rusting iron is an example of what type of change?
Chemical change
What group serves as a comparison in an experiment?
Control group
What is 78,700,000,000 in scientific notation?
7.87 × 10¹⁰
How many significant figures are in 3.0 × 10⁸ m/s?
2
Round 12.3478 to 3 significant figures
12.3
What is the correct unit for mass?
Gram (g)
What is the term for a substance that dissolves another?
Solvent
What is an example of a physical change?
Melting ice or boiling water.
What is kept the same among all test groups?
Constant
If mass = 3.75 g and volume = 1.5 mL, find density.
2.5 g/mL
How many significant figures are in 0.004560 g?
4
When multiplying 2.3 (2 sig figs) × 4.56 (3 sig figs), how many sig figs should the answer have?
2 significant figures
What is density’s formula?
Mass ÷ Volume
What type of mixture can be separated by a magnet?
Heterogeneous mixture (iron and sand)
A new substance forming is a sign of what?
Chemical reaction
Which graph best shows change over time?
Line Graph
Convert 6 cm to meters
0.06 m
How many significant figures are in 120.0 cm?
4
Convert 3.45 × 10⁻³ to standard notation
0.00345