Track quiz
Thirteen rules, one per bench, in the bench's own words. Then fourteen questions.
| Idea | The rule, as the lab applies it |
|---|---|
| What pure means here | A pure substance has only one kind of particle. It cannot be split by physical steps. A mixture has two or more substances. Each one is still there. The substances do not react with each other. |
| Substances that will not come apart | An element is a substance that cannot be broken into simpler ones. All its atoms are of one kind. Water is not an element: electricity splits it into hydrogen and oxygen. |
| An agreed short name | Every element has an agreed symbol. It starts with a capital letter. A second letter, if there is one, is small. Some symbols come from older names. |
| Joined in a fixed ratio | A compound is made when elements join in a fixed ratio. Its properties differ from those of its elements. Physical methods cannot separate its elements. |
| Together, but not joined | In a mixture, two or more substances are mixed but not joined. They do not react with each other. The amounts can vary. A uniform mixture looks the same throughout. |
| Trying to get the parts back | Physical methods can separate a mixture. They cannot separate a compound into its elements. Iron mixed with sulfur is still pulled by a magnet. A compound has new properties. |
| Sorting everyday things into piles | Count the substances first. Two or more means a mixture. One substance is an element or a compound. A compound can be split into simpler substances by a chemical change. An element cannot. |
| Atoms joined as one particle | A molecule is a group of atoms joined together. One kind of atom in a molecule means an element. Two or more kinds mean a compound. |
| Which states are mixed | Each part of a mixture is a solid, liquid or gas. That is its state alone, at room temperature. Sort a two-part mixture by the states of its parts. Six pairs of states are possible. |
| Between a metal and a non-metal | A metalloid is an element that sits between metals and non-metals. Silicon is shiny, like a metal. It breaks into bits, like sulfur. It carries electricity, but poorly. |
| Minerals from the ground | A mineral is a solid that forms in nature. Most minerals are compounds. A few are pure elements, called native minerals. Gold is both a native mineral and a metal. |
| Same acid, different gas | A word equation names the substances that go in and come out. Iron and dilute hydrochloric acid make iron chloride and hydrogen. Iron sulfide and the acid make iron chloride and hydrogen sulfide. Sulfur does not react with the acid. |
| What counts as matter? | Matter is anything that has mass and takes up space. Stone, water and air are matter. Light, sound and heat are not matter. Thoughts and feelings are not matter. |
A jeweller's 22 carat gold is gold mixed with other metals. What is it in science?
Electricity splits a clear liquid into two gases. What does that show?
Someone writes copper's symbol as C. What is wrong?
Water takes 2 hydrogen for every 1 oxygen. You have 6 hydrogen and 4 oxygen. What is made?
Brass is copper and zinc mixed evenly. What is it?
A magnet pulls iron out of a powder. After heating, the powder gives no iron to the magnet. What happened?
Why is air a mixture?
Sodium and chlorine are joined 1 to 1 in salt. What is salt?
A particle has 2 hydrogen atoms and 1 oxygen atom, joined. What is it?
Which of these is a mixture of a gas and a liquid?
Silicon has a metal shine and breaks into bits when hit. It carries electricity poorly. What kind of element is silicon?
What is a native mineral?
Iron and sulfur are heated together. A little of the product is put in dilute acid. The gas smells of rotten eggs. What is the product?
Why is light not matter?
Chapter 8 is Nature of Matter: Elements, Compounds, and Mixtures. Read it this week. You have sorted, split and joined in these labs.
Next is a chapter on how much is dissolved. It is The Amazing World of Solutes, Solvents, and Solutions.