Elements, compounds and mixtures
Cards (38)
- Approximately how many different elements are there?
- According to the video, what element is shown on the right of the screen?
- What must you learn the definition of?
- In an element, what is true of all the atoms?
- In a sample of magnesium, what is true of all the atoms?
- In a sample of sulfur, what is true of all the atoms?
- What does it mean that both magnesium and sulfur are two different elements?
- Every element has a what?
- How does every symbol start?
- What is the symbol for magnesium?
- What is the symbol for sulfur?
- What do we have if we take atoms of magnesium and atoms of sulfur and chemically combine them?
- What is the compound formed by chemically combining magnesium and sulfur called?
- What do compounds contain?
- How are elements combined in a compound?
- What must you learn the definition of?
- What does fixed proportions mean?
- In magnesium sulfide, what is the proportion of magnesium atoms to sulfur atoms?
- What is a key fact about the properties of compounds compared to the elements they're made from?
- What is magnesium at room temperature?
- What is sulfur at room temperature?
- What does magnesium sulfide form?
- How can we separate a compound back into its elements?
- Are chemical reactions always easy to do?
- What do we have in a mixture?
- In a mixture, are the elements or compounds chemically combined?
- What is shown in the video?
- How can we separate a mixture?
- What word is often used in chemistry?
- What does a molecule have?
- What is true of methane, water, and ammonia?
- What elements does methane contain?
- What elements does water contain?
- What elements does ammonia contain?
- What is true of chlorine and oxygen molecules?
- What elements make up a chlorine molecule?
- What elements make up an oxygen molecule?
- Where can you find questions on this topic?