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Density practice
Question | Answer |
---|---|
What is the density of a rock with a mass of 45g and a volume of 15ml? | 3 g/ml |
Which would be more dense - a container with 9 atoms and a volume of 1mL or a container with 9 atoms and a volume of 2mL? | Container with 9 atoms and a volume of 1 mL |
Does hot air/water rise or sink? Why? | Hot air/water rises because it is less dense than cold air/water |
What causes convection currents to happen? | Differences in density - hotter stuff is less dense than colder stuff, therefore hot stuff will rise and cold stuff will sink |
Do you think that cold ocean water is more or less dense than warm ocean water? | Cold ocean water is more dense - the particles are closer together than hot ocean water |
Which is saltier - cold ocean water or hot ocean water? | Cold ocean water - when water freezes, the salt gets left behind, making the ocean water in the poles saltier and more dense. |
Why does high pressure move to low pressure, causing wind? | Because high pressure is air that is more dense. Low pressure is air that is less dense. A low pressure area has more space for air molecules, so the high pressure moves to the low pressure to fill in that space. |
What is the formula for density? | Density=m/V = mass/volume (mass divided by volume) |
What are the units for volume? | mL, cm^3, or L |
What are the units for mass? | g or kg |
What are the units for density? | g/mL, kg/L, g/cm^3 |
1 mL = ? | 1 cm^3 = 1mL |
What is the density of pure water? | 1 g/mL |
What causes and object to sink or float in water? | An object will sink if it is more dense than water (> 1g/mL) and it will float if it is less dense (<1 g/mL) |