Unit 1 Matter Review

Adam analyses a sample of a substance. He concludes that it consists of more than one type of atom chemically combined. What does the substance represent

• an element

• a compound

• a heterogeneous mixture

• a homogeneous mixture

What composes an element?

• atoms of the same structure

• compounds of the same structure

• mixtures of different substances

• molecules of different structures

A key for elements is represented by colored circles. Which diagram would best represent water?

• P

• Q

• R

• S

A student leaves a bowl of ice cream on a table, where it turns to a liquid. The student places the liquid ice cream back into the freezer overnight. How do the motion of the particles in the ice cream change when it is placed in the freezer?

• the particles slow down and move closer together

• the particles speed up and move closer together

• The particles slow down and move farther apart

• the particles speed up and move farther apart

Which statement best describes a gas?

• a gas has particles that are close together but can slide past one another

• a gas has particles that have large distances between them and move freely

• a gas has particles that are close together but move freely

• a gas has particles that have not space between them and do not move

A substance is examined under a high power electron microscope. The substance is found to contain only one type of atom. What is this substance?

• compound

• element

• mixture

• solution

Josh prepared an atomic model for his science project, as shown. Ruth observes the model and classifies it as compound. Is Ruth's classification correct?

• No. A compound is made of atoms of a single element that cannot be joined

• Yes. A compound is made of one or more similar atoms that may be joined chemically or physically

• No. A compound is made of two or more atoms of different elements joined by bonds

• Yes. A compound is made of only two similar atoms joined together by a bond.

A student sketches the particles of a particular substance in the three states of matter. Which state of matter is shown by each sketch.

• A is solid, B is liquid, and C is gas

• A is gas, B is solid, and C is liquid

• A is liquid, B is gas, and C is solid

• A is liquid, B is solid, and C is gas

The diagram shows the particle vibration of an unknown substance in a container. Which substance can likely be represented by the motion of the particles in the diagram?

• ice

• oil

• water

• water vapor

A substance changed from one state to another. The image shows its particle motion in the first state and the second state. How is the transition between State 1 and State 2 best described?

• solid state to liquid state

• liquid state to solid state

• liquid state to gaseous state

• gaseous state to solid state