1.3 Ocean Chem Unit Practice (2024)

Front

What happens to the density of an object if you lose water while measuring its volume?

Back

The density will be higher than it should be.

Front

Calculate the density (D) of an object with a mass (m) of 16g and a volume (v) of 4cm³.

Back

Density (D) = mass (m) / volume (v) = 16g / 4cm³ = 4g/cm³.

Front

If you dissolve 6g of salt in 6000ml of water, what is the salinity in ppt?

Back

Salinity = (mass of salt / volume of water) * 1000 = (6g / 6000ml) * 1000 = 1 ppt.

Front

How much salt (in grams) is in 2000ml of a 10 ppt solution?

Back

Salt = (salinity * volume) / 1000 = (10g/L * 2L) = 20g.

Front

If the total mass of an object is 10g and its density is 0.5g/cm³, what is its volume?

Back

Volume = mass / density = 10g / 0.5g/cm³ = 20cm³.

Front

Define density.

Back

Density is the mass of an object divided by its volume, typically expressed in g/cm³.

Front

What is the formula for calculating density?

Back

Density (D) = Mass (m) / Volume (v).

Front

What is salinity and how is it measured?

Back

Salinity is the concentration of salt in water, measured in parts per thousand (ppt).

Front

Explain the relationship between mass, volume, and density.

Back

Mass is the amount of matter in an object, volume is the space it occupies, and density is how much mass is contained in a given volume.

Front

What is the significance of measuring salinity in ocean chemistry?

Back

Salinity affects water density, circulation patterns, and marine life distribution.