Chemical Building Blocks Chapter 1.1 Flashcards

Questions and Answers

What is the difference between chemical properties and physical properties?

Physical properties can be observed without changing pure substances into other substances. Chemical properties can be observed only by changing pure substances into other substances.

A metal melts at 450°C. Is this property of the metal classified as chemical or physical property? Explain your choice.

Melting point is a physical property because the metal is still the same substance, it is only changing form.

Does helium's inability to react with any other substance represent a chemical property?

Yes. The fact that helium does not react with any other substance is a chemical property because it describes helium's ability to change (or not to change) into different substances.

How are elements and compounds similar? How do they differ?

Both elements and compounds are pure substances. Elements are not made of simpler substances, whereas compounds are made up of two or more chemical elements that are chemically combined. Signup and view all the answers

What elements make up the sugar compound with the formula C6H12O6?

C6H12O6 is made up of the elements carbon, hydrogen, and oxygen. Signup and view all the answers

How does a heterogeneous mixture differ from a homogeneous mixture?

You can see the different parts of a heterogeneous mixture, but the substances in a homogeneous mixture are so thoroughly mixed you cannot see them. Signup and view all the answers

Why is it correct to say seawater is a mixture?

Seawater is a mixture made up of salt, water, and many other substances. Signup and view all the answers

How could you prove that the clear substance created by dissolving baking soda in water is a solution, not a compound?

You could put some of the liquid in an open container. When the water in the solution evaporates, solid baking soda would remain. Signup and view all the answers

Study Notes

Chemical Properties vs. Physical Properties

Physical properties are observable without changing a substance into a different one.
Chemical properties can only be observed when a substance undergoes a change into another substance.

Melting Point Classification

Melting point (450°C for metals) is a physical property since the metal retains its identity even when its state changes.

Helium's Chemical Property

Helium's lack of reactivity with other substances is a chemical property, indicating its stability and inability to change into other substances.

Elements vs. Compounds

Both elements and compounds are classified as pure substances.
Elements consist of one type of atom, while compounds are formed from two or more chemically bonded elements.

Composition of Sugar Compound

The sugar compound with the formula C6H12O6 is composed of carbon, hydrogen, and oxygen.

Heterogeneous vs. Homogeneous Mixtures

Heterogeneous mixtures have visibly distinct parts, while homogeneous mixtures are uniformly mixed, making individual components undetectable.

Seawater as a Mixture

Seawater is classified as a mixture because it contains salt, water, and numerous other dissolved substances.

Proving a Solution vs. Compound

To demonstrate that a baking soda and water mixture is a solution, one can evaporate the water in an open container, leaving behind solid baking soda, which indicates it is not a compound.

Description

Explore the fundamental concepts of chemical and physical properties in this engaging set of flashcards. Learn how these properties differ and gain a deeper understanding of material science. Perfect for beginners or as a quick review for students.