Properties and Changes Review

Physical properties are

• properties that can be observed without changing the identity of the substance
• properties that describe how a substance changes into a completely different substance
• properties that we can only observe with our eyes
• properties that we need special tools to observe

what is the definition of chemical change?

• any change that results in the formation of new chemical substances. 
• changing clothes
• matter cannot be created or destroyed, only change form
• changes affecting the form of a chemical substance, but not its chemical composition.

A student has a small sample of an unknown sample that they are trying to identify during a lab investigation. The student divides the mass of the sample by its volume. What property of matter is the student using to identify the sample?

• The physical property of mass

• The chemical property of volume

• The chemical property of reactivity

• The physical property of density

Two cups of the same size are filled to the brim with clear liquids. Cup A holds water. Cup B contains alcohol. Your teacher challenges you to figure out which cup holds water. Because of your great science knowledge, you know that all substances have their own special properties. You and your lab partner add an ice cube to each cup. The ice floats in one liquid. You predict it is water. And the ice sinks in the other liquid. You predict that liquid is alcohol. What type of property of matter did you use to identify the liquids?

• physical property

• chemical property

• magnetic property

• freezing point property

What happens in ALL chemical changes?

• Change in state of matter
• A new substance is formed
• Bubbles are produced
• An explosion

Most metals are solid at room temperature, malleable, ductile, good conductors of heat and electricity, and react in acids to produce hydrogen gas. Which of the properties mentioned is a chemical property?

• are malleable

• reacts with acids

• solid at room temperature

• are good conductors of heat

Silver is a white metal and is an excellent conductor of heat and electricity. The density of silver is 10.49 g/cm³. Silver does not react with water but it does react with nitric acid. Silver tarnishes when exposed to air or light. What is a physical property of silver?

• density

• tarnishes

• reacts with nitric acid

• does not react with water

Which of these properties are not physical property? (Choose 2)

• Combustibility

• Color

• Melting point

• Reactivity

• Malleability

Which of the following statements describes a chemical property of most metals.

• Metals have high melting and boiling points.

• Very few metals are combustible.

• Most metals are lustrous.

• All metals, excluding mercury, are solid at room temperature.

Alice and Marge are studying the properties of matter. The girls placed some an iron nail in a beaker containing water. Iron is a solid metal at room temperature. Iron is a shiny and malleable; it can be formed into shapes like the nails the girls used. Iron will turn reddish-brown in the presence of air or water as it rusts. Iron is a good conductor of electricity and heat. After 48 hours, the girls checked the nail in the water and compared it to the nail they left on the lab bench. Here is a photo of their results. Based on the girls' experiment, what is a chemical property of iron?

• Iron is malleable.

• Iron rusts in water.

• Iron is a strong metal.

• Iron is a good conductor.