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8Sci_Elements
Elements, Molecules, Compounds & Mixtures
| Question | Answer |
|---|---|
| Does a proton, neutron or electron have a negative charge? | an electron |
| What two elements make up water? | hydrogen and oxygen |
| What do orbitals contain? | electrons |
| Which has a greater atomic mass, hydrogen or neon? | neon |
| Is the nucleus of an atom always positively or negatively charged? | positively |
| What is the chemical formula - 3 carbon atoms and 8 hydrogen atoms? | C3H8 |
| What is ozone (O3) an example of? | molecule |
| How many different elements are in methane, CH4? | two |
| What is an element? | purest, simplest form of matter |
| What is salt an example of? | a molecule, a compound and two elements chemically bonded |
| Which of the following is the heaviest - electron, proton, nucleus or neutron? | nucleus |
| What is nitrogen an example of? | an element |
| What would the chemical combination of Atom A with Atom B result in? | molecule AB |
| What is Magnesium an example of? | an element |
| What is steel an example of? | a mixture |
| What is an example of a homogeneous mixture? | air |
| How do elements combine to form a compound? | in certain ratios |
| What is a heterogeneous mixture? | it contains two or more substances that may or may not be easily distinguished |
| What is the ratio of the elements involved in methane, CH4? | 1:4 |
| The formula for glucose is C6H12O6. How many atoms are present in the glucose compound? | 24 |
| What is an example of a heterogeneous mixture? | salad |
| What is a homogeneous mixture? | it contains two or more substances that are not easily dintinguished |
| What are two examples of pure substances? | oxygen and gold |
| What is the resulting compound when elements chemically combine? | it contains different properties of elements before combination |
| What is the chemical symbol for Tin? | Sn |
| How many neutrons does Argon have? | 22 |
| What series of activities would you use to separate sawdust, water and iron fillings? | evaporation, then magnetic separation |
| What is the chemical symbol of the element BELOW Helium on the periodic table? | Ne - Neon |
| How many electrons does Calcium have? | 20 |
| What are the four main ways to physically separate mixtures? | 1 - sifting 2 - filtration 3 - evaporation 4 - magnetic separation |
| How would you use sifting to physically separate mixtures? | it separates two solids by size ex: rocks out of soil |
| How would you use filtration to physically separate mixtures? | it separates solid from liquid (heterogeneous mixture) ex: sand and water |
| How would you use evaporation to physically separate mixtures? | it separates solid from liquid (homogeneous mixture) also called distillation ex: salt water |
| How would you use magnetic separation to physically separate mixtures? | it separates materials based on magnetic properties ex: metal scraps from wood chips |
| Define, solvent. | substance that dissolves ex: water |
| Define solute. | substance that is dissolved ex: kool-aid, sugar |
| Why are carbon monoxide (CO) and carbon dioxide (CO2) different? | because they have different amounts of atoms and ratios |
Created by:
masonteach
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