Measurements and Significant Figures
Define accuracy and precision in measurements.
What is accuracy refers to how close measurements are to the true value, while precision refers to how close measurements are to each other, but not to the true value?
Convert 5 kilometers to meters.
What is 5000 meters?
1 km = 1000 metersThe formula for density
What is density = mass/volume?
Name the three states of matter.
What are solid, liquid, and gas?
What is an ion?
What is an atom that has gained or lost electrons, resulting in a charge?
Identify the number of significant figures in 0.00450.
Convert 32 inches to centimeters (1 inches = 2.54 cm).
What is 81 cm?
A cube has a length of 4 cm, a width of 4 cm, and a height of 4 cm. What is its volume?
What is 64 cm3?
A physical change does not alter the composition of a substance, while a chemical change results in a new substance being formed.
What charge does an oxygen ion typically have when it gains 2 electrons?
What is O with the charge of 2-?
Round 56.3789 to 3 significant figures.
What is 56.4?
Convert 750 milliliters to cubic centimeters.
What is 750 cm3?
A liquid has a density of 1.2 g/mL. What is the mass of 50 mL of this liquid?
What is 60 g or 6.0 x 101 g?
Identify whether burning paper is a physical or chemical change.
What is a chemical change?
The isotope carbon-14 has how many protons and neutrons?
What are 6 protons and 8 neutrons?
Express 0.0000892 in scientific notation.
What is 8.92 x 10-5?
How many feet are in 2.5 miles? (1 mile =5280 feet)
A metal block has a mass of 250 g and a volume of 50 cm3. What is its density?
What is 5 g/cm3?
The three subatomic particles in an atom and their charges
What are protons (+), neutrons, and electrons (-)?
A neutral atom has 12 protons and 10 electrons. What is its charge?
What is +2?
Solve: (4.56 x 103) / (1.2 x 102).
What is 3.8 x 101?
Convert 250 degrees Fahrenheit to Kelvin.
A rock has a mass of 100 g and is placed in a graduated cylinder containing 30 mL of water. If the water level rises to 45 mL, what is the density of the rock?
What is 7 g/mL?
An atom has 17 protons, 18 neutrons, and 17 electrons. What is its atomic notation?
What is 35Cl?
The atomic weight of chlorine is 35.45 amu. If chlorine has two naturally occurring isotopes, Cl-35 (75%) and Cl-37 (25%), calculate the atomic weight to verify the given value.
What is (35 x 0.75) + (37 x 0.25) =35.5 amu?