JHSER Science Test 1

In a solution, the substance that is dissolved is known as the:

• solute

• solvent

• colloid

• suspension

Which of the following best describes a heterogeneous mixture?

• A mixture in which the components are evenly distributed and indistinguishable

• A mixture in which the components are unevenly distributed and can be visually distinguished

• A pure substance composed of only one type of atom or molecule

• A mixture that has the same composition throughout

An emulsion is best described as:

• A type of solution where the solute is evenly distributed in the solvent

• A heterogeneous mixture where fine particles are dispersed in a liquid but not dissolved

• A homogeneous mixture of two or more substances that do not dissolve in each other

• A pure substance composed of a single element or compound

A suspension is best described as:

• A homogeneous mixture in which the components are evenly distributed and indistinguishable

• A type of solution where the solute is completely dissolved in the solvent

• A heterogeneous mixture in which solid particles are dispersed in a liquid or gas but will eventually settle out

• A pure substance composed of a single type of element or compound

Which of the following is a characteristic of an acid?

• It has a slippery feel and a bitter taste

• It turns red litmus paper blue

• It reacts with metals to produce non-metallic oxides

• It has a sour taste and turns blue litmus paper red

The Tyndall effect is best observed in which of the following?

• A colloidal mixture where particles are large enough to scatter light

• A pure substance with a uniform composition

• A suspension where particles settle out over time

• A true solution where the solute is completely dissolved

In a saltwater solution, which statement correctly identifies the solute and the solution?

• Water is the solute and salt is the solution.

• Salt is the solute and saltwater is the solution.

• Salt is the solute and water is the solution.

• Saltwater is the solute and salt is the solution.

Which of the following statements correctly differentiates between a compound and an element?

• An element is made up of different types of atoms bonded together, while a compound consists of only one type of atom.

• An element can be broken down into simpler substances by chemical means, while a compound cannot.

• A compound is made up of two or more elements chemically bonded together, while an element consists of only one type of atom.

• A compound can exist in different physical states, while an element can only exist in one physical state.

Which of the following best describes the process of distillation?

• A process that separates components of a mixture based on their boiling points

• A method of separating a mixture based on the different sizes of particles

• A method of combining two or more liquids to form a homogeneous mixture

• A technique used to separate a solid from a liquid by pouring off the liquid

Which of the following best describes the process of filtration?

• A method of separating substances based on their magnetic properties

• A technique used to separate a solid from a liquid by passing the mixture through a barrier that traps the solid

• A process that separates components of a mixture based on their boiling points

• A method of combining two or more substances to form a homogeneous mixture