Tools & Units & Phases
This is the tool used to measure mass
Triple beam balance or scale
Is density a physical or chemical property?
Physical property
What mathematical function should you use to find the mass of an unknown liquid?
(Subtract, add, divide, multiply?)
Subtract
What is the property that keeps oil, water and dish soap separated into layers.
Density
What 2 properties do you need to determine the density of an object?
mass and volume
This is the tool to measure volume
Graduated cylinder or beaker
Is decomposes a physical or chemical property?
Chemical property
What mathematical function do you use to find the density of an object if you have the volume & mass?
(Subtract, add, divide, multiply?)
Divide
An object has a volume of 5 mL and a mass of 30 g. What is the density?
6 g/ml (30 g/5 mL)
The volume of a liquid is 5 mL and the mass of the liquid is 25 g. What is the density?
5 g/mL (25 g/5 mL)
The units for mass
grams
How many of the following observations are qualitative?
3
What is the volume of the unknown object?
Volume of Water= 14 ml
Volume of Water + Object=18 ml
4 mL
A cup of gold colored metal beads was measured to have a mass 425 grams. By water displacement, the volume of the beads was calculated to be 48.0 cm3. Given the following densities, identify the metal.
Gold: 19.3 g/mL
Copper: 8.86 g/mL
Bronze: 9.87 g/mL
Copper (425 g/38 cm3 = 8.85 g/cm3)
The volume of a solution was measured in a graduated cylinder to be 45 mL. If the mass of solution is measured to be 60.75 grams, what is the density of the solution?
1.35 g/ml (60.75 g/45 mL)
The units for measuring volume
mL and cm3
How many of the following observations are quantitative?
What is the volume of the unknown object?
Volume of Water= 28 ml
Mass of Object = 10 g
Volume of Water + Object=43 ml
15 mL (43 mL - 28 mL)
5 mL of ethanol has a mass of 3.9 g, and 5.0 mL of benzene has a mass of 44 g. Which liquid is denser?
Benzene (Benzene = 8.8 g/mL and Ethanol = 0.78 g/mL)
Calculate the density of an unknown object using the data provided below:
Mass of Object=26 g
Volume of Water=14 ml
Volume of Water + Object=18 ml
6.5 g/mL (1: 18 mL - 14 mL = 4mL 2: 26 g/4mL)
Describe the particles in a gas. (Movement, space between particles and temperature)
The particles are moving fast, spread out and have a high temperature.
How many of the following properties are physical?
4
What is the mass of the object?
Mass of an empty beaker=20 g
Volume of object = 15 mL
Mass of beaker with object=30 g
10 g (30 g - 20 g)
A piece of wood that 72 mL has a mass of 80.0 grams. What is the density of the wood? Would the piece of wood float in water?
1.11 g/mL, No (80.0 g/72 mL)
An irregularly shaped stone was lowered into a graduated cylinder holding a volume of water equal to 2 ml. The height of the water rose to 7 ml. If the mass of the stone was 25 g, what was its density?
5 g/mL (1: 7 mL-2mL = 5 mL 2: 25g/5mL)