PBFP_Pure Substance Or Mixture?

What is a pure substance?

• A substance with a definite and constant composition

• • A substance that can easily be separated into different components

• A substance that has no mass

• A substance that changes composition over time

What is an example of a pure substance?

• Saltwater
• Salt

• Milk

• Tap water

Which of the following is a heterogeneous mixture?

• Water and sugar

• Water and sand

• Water and salt

• Vinegar

What is the solvent in a sugar-water solution?

• Sugar

• Water
• Both

• There is no solvent

Which is an example of a miscible mixture?

• Oxygen and nitrogen

• Olive oil in water

• Milk in oil

• Paper in water

What is the main difference between a homogeneous and a heterogeneous mixture?

• Whether the composition is uniform or not

• The presence or absence of particles

• The ability to separate the components

• The state of matter of the components

What do we call the substance that dissolves in a solution?

• Solute

• Solvent

• Soluble

• Liquid

Why can’t the components of a homogeneous mixture be distinguished by sight?

• The composition is uniform

• They are not chemically bonded

• The particles are too small to be seen

• The components do not mix

Which is true about the law of conservation of mass in mixtures?

• The mass of a mixture equals the mass of its components

• The mass of a mixture is always less than the sum of its parts

• The mass of a mixture changes when components are combined

• The mass of a mixture depends on the type of solution

Which of the following statements about a solution is correct?

• The solute can be a solid, liquid, or gas

• A solution can only form between two liquids

• The solute is always in a greater amount than the solvent

• A solution is a type of heterogeneous mixture