Mass Hysteria Mass, volume, and measurement
What tool do scientists use to measure mass
Balance Beam
What property helps determine whether an object sinks or floats?
Density
A balloon filled with air expands when warmed. What happens to the movement of the air particles?
Particles move faster, causing the gas to expand if the balloon can stretch.
What is the change from solid to liquid called?
Melting
A rectangular box is 4 cm long, 3 cm wide, and 2 cm high. What is its volume?
24 cm³
What is the formula for cubic volume?
length x width x height
What is the formula for density?
Mass / Volume
Which state of matter has particles that vibrate in fixed positions?
Solid
Water droplets form on a bathroom mirror after a hot shower. Identify the change of state and whether heat is gained or lost by the water vapor.
Condensation
A rectangular block is 7 cm long, 3 cm wide, and 4 cm high. Calculate its volume.
84 cm³
A student measures the mass of an object as 85 g and its volume as 25 cm³. Calculate its density.
3.4 g/cm³
Two objects each have a mass of 60 g. Object A has a volume of 20 cm³, and Object B has a volume of 40 cm³. Which is denser?
Object A
Which state of matter has particles that move freely and spread out to fill a container?
Gas
A puddle disappears on a sunny day. Identify the change of state and explain what happens to the particles.
Evaporation
A graduated cylinder starts with 35 mL of water. After adding a rock, it reads 50 mL. What is the rock's volume?
15 cm³
A box is 5 cm long, 3 cm wide, and 2 cm tall. What is its volume?
30 cm³
An object has a density of 2.5 g/cm³ and a volume of 12 cm³. What is its mass?
30 g
Two cups of water are at different temperatures. Cup A is 15°C and Cup B is 60°C. Which cup has particles with greater average kinetic energy?
Cup B, because its temperature is higher.
A student places water in a freezer. Describe what happens to particle movement and arrangement as the water freezes.
Particles slow down and become arranged in fixed positions, where they continue vibrating.
A rock has a mass of 72 g. The water level rises from 40 mL to 64 mL. Calculate the rock's volume and density.
Volume: 24 cm³. Density: 3 g/cm³
Water rises from 25 mL to 40 mL when a rock is placed in a graduated cylinder. What is the rock's volume?
15 mL or 15 cm³
Object A has a mass of 90 g and volume of 30 cm³. Object B has a mass of 120 g and volume of 60 cm³. Which is denser, and by how much?
A = 3 g/cm³
B = 2 g/cm³.
Object A is denser by 1 g/cm³.
Why does adding heat energy cause ice to melt?
Particles gain energy and can move out of their fixed positions
Why is melting ice considered a physical change instead of a chemical change?
It is still water; no new substance forms
Two rocks are tested. Rock A has a mass of 60 g and raises water from 20 mL to 40 mL. Rock B has a mass of 80 g and raises water from 30 mL to 70 mL. Which rock is denser? Show your calculations.
Rock A: 60 ÷ 20 = 3 g/cm³.
Rock B: 80 ÷ 40 = 2 g/cm³.
Rock A is denser.