Density Volume, Mass, Pressure, Temperature

If the mass of an object increases while its volume remains the same, its density will

• increase

• decrease

• remain the same

Answer explanation

We are adding more molecules into the same amount of space. There will be less room for all of the molecules so they will be more compact.

More compact=higher density

If the mass of an object decreases while its volume remains the same, its density will

• increase

• decrease

• remain the same

Answer explanation

If the mass is decreasing, the amount of molecules inside the object is lowered. That means there is more space between the molecules that are left behind, they are less compacted.

Less compact = lower density.

If the volume of an object increases while its mass remains the same, its density will

• increase

• decrease

• remain the same

Answer explanation

More volume mean more space for the molecules. Since the mass is constant, we are not adding more molecules into the object. there will be more space between the molecules and they will be less compacted.

Less compact = lower density.

If we decrease the volume of an object and keep the mass constant, the density will

• increase

• decrease

• remain the same

Answer explanation

Decreasing the volume means there is less space for the molecules. They will be closer to together, more compacted.

More compact = higher density

If we increase the temperature of a substance, its density will

• increase

• decrease

• remain the same

Answer explanation

Increasing the temperature will make the molecules move faster and spread away from each other. They will be less compacted.

Less compact = lower density

Tags

NGSS.MS-PS1-4

If we decrease the temperature of a substance, its density will

• increase

• decrease

• reamin the same

Answer explanation

Increasing the temperature will make the molecules move slower and get closer together. There will be less space between the molecules, they will be more compacted.

More compact = higher density.

Tags

NGSS.MS-PS1-4

If we increase the pressure on a substance, the density will

• increase

• decrease

• remain the same

Answer explanation

Increasing the pressure means we are squeezing the substance, lowering its volume. The molecules will be forced closer together and be more compacted.

More compact = higher density

If we decrease the pressure on a substance, the density will

• increase

• decrease

• remain the same

Answer explanation

If we decrease the pressure we are increasing the volume (making more space for the molecules ). The molecules will be less compacted.

Less compact = lower density

The definition of density is

• the amount of matter in an object/substance

• The amount of space an object/substance takes up

• How compact the molecules are in an object/substance

• The ability to float or sink in water.

If a block has a density of 20.0 g/cc and we cut it into 4 equal pieces, what is the density of ONE of the smaller pieces?

• 5.00 g/cc

• 4.00 g/cc

• 20.0 g/cc

• 1.0 g/c

Answer explanation

The density of an object/substance does not change when the sample size does. Density measures the packing of the molecules and that only changes when temperature or pressure change. Cutting the object into smaller pieces does not change the density.