Fluids review

Fluids can be which of the following states of matter?

• Solids and liquids

• Solids and gases

• Liquids and gases

Answer explanation

Fluids are substances that can flow, which includes liquids and gases. Solids do not flow and therefore are not considered fluids. Thus, the correct answer is liquids and gases.

Out of the following fluids, which is the most viscous

• Air

• Corn syrup

• Helium

• Honey

Answer explanation

Honey is the most viscous fluid among the options. Viscosity measures a fluid's resistance to flow, and honey, being thick and sticky, has a higher viscosity compared to air, corn syrup, and helium.

What creates a fluid's viscosity

• chemical reactions between particles

• forces of attraction between particles

Answer explanation

A fluid's viscosity is primarily influenced by the forces of attraction between its particles. Stronger attractions lead to higher viscosity, as particles resist flow more than in fluids with weaker attractions.

What happens to the viscosity of a liquid when its temperature is DECREASED?

• The viscosity of the liquid decreases

• The viscosity of the liquid increases

• The viscosity of the liquid stays the same

Answer explanation

When the temperature of a liquid decreases, its molecules move slower, leading to increased interactions and resistance to flow. This results in an increase in viscosity, making the liquid thicker.

What happens to the viscosity of a liquid when its temperature is INCREASED?

• The viscosity of the liquid decreases

• The viscosity of the liquid increases

• The viscosity of the liquid stays the same

Answer explanation

When the temperature of a liquid increases, its molecules move faster, reducing intermolecular forces. This results in a decrease in viscosity, making the liquid flow more easily.

Orange juice has a...

• Low viscosity

• High viscosity

Answer explanation

Orange juice has a low viscosity, meaning it flows easily and is not thick. This characteristic allows it to be poured and consumed without difficulty, distinguishing it from liquids with high viscosity.

Lamp oil has a...

• low viscosity

• high viscosity

Answer explanation

Lamp oil is known for its low viscosity, which allows it to flow easily and be used effectively in lamps. High viscosity liquids are thicker and do not flow as freely, making 'low viscosity' the correct choice.

Honey has a...

• Low viscosity

• High viscosity

Answer explanation

Honey has a high viscosity due to its thick, sticky consistency, which is a result of its sugar content and water content. This makes it flow slowly compared to liquids with low viscosity.

Oh no - my honey is stuck in its container! What simple thing can I do to help make the honey flow easily again?

• Heat it up

• Cool it

• Nothing

• Eat it

Answer explanation

To help honey flow easily, you can heat it up. Warmth reduces its viscosity, making it less thick and easier to pour. Cooling or doing nothing won't help, and eating it doesn't solve the problem of it being stuck.

Put the liquids in order from most dense to least dense.

• 1,2,3,4

• 3,4,2,1

• 4,3,1,2

• 4,3,2,1

Answer explanation

The correct order from most dense to least dense is 4, 3, 2, 1. This is based on the known densities of the liquids, where liquid 4 is the densest and liquid 1 is the least dense.