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CBA # 6th grade
science
| Question | Answer |
|---|---|
| What is the definition of an element? | An element is a pure substance that cannot be broken down into simpler substances. An atom is the smallest particle of an element maintaining the chemical identity of that element. |
| Which elements make up the solid portion of Earth? | The solid parts of Earth are made of mostly oxygen and silicon |
| Which elements are common to living organisms? | Living matter is mainly made of oxygen, carbon, hydrogen, nitrogen, calcium and phosphorus. |
| Which element is the most common on Earth? | oxygen |
| Which elements make up the oceans? | The oceans are mainly made of oxygen and hydrogen, which are the elements in water. |
| Which elements are found in the atmosphere? | The atmosphere is mainly made of nitrogen and oxygen. |
| What is the difference between an element and a compound? | A substance that contains two or more different elements is a compound. |
| Pure Substance | Matter that is made up of the same particles throughout |
| Chemical Symbol | The symbol that represents each element on the periodic table |
| Periodic Table of Elements | An arrangement of the elements according to their atomic numbers and periodic trends of physical and chemical properties |
| Matter | Anything that has volume and mass |
| Atomic Number | The number of protons (positive charges) in an atomic nucleus |
| periodic Groups | The columns on a periodic table that arrange the elements by select characteristics |
| Periodic Periods | The rows in a periodic table that classify the elements by select characteristics |
| Atom | The smallest unit of an element that has all of the properties of that element |
| Physical Property | Those characteristics that can be observed without changing the identity of the substance such as size, shape, luster, conductivity, malleability, and magnetic attraction |
| Chemical Reaction | The process by which one or more substances change to produce one or more different substances |
| Chemical Formula | A shorthand notation that uses chemical symbols and numbers as subscripts to represent the type of atoms and number of atoms that are present in the smallest unit of the substance |
| What is a chemical change? | A chemical change occurs when elements bond together or when bonds of compounds are broken and form a new substance. |
| What forms from a chemical change? | A new substance forms from a chemical change. It may have different properties than those of the original substance. |
| What are some signs of a chemical change? | We often observe signs of a chemical change by the gas production, precipitate formation, absorption or energy release in the form of heat or light, a color change or odor formation. |
| Property | The characteristics or qualities of a substance: physical and chemical |
| Physical Change | A change without forming a new substance such as a different size or state of matter |
| Phase of Matter | A phase is another name for a physical state of matter such as solid, liquid, or gas |
| Production of Heat or Light | Evidence of a chemical reaction |
| Formation of a Precipitate | Evidence of a chemical reaction |
| Production of Gas | Evidence of a chemical reaction |
| Rust | Red oxides, formed by the reaction of iron and oxygen in the presence of water or air moisture |
| Corrode | The result of a chemical reaction between a metal and its surroundings during which the metal is oxidized. |
| Combust | The process of burning. A chemical change, especially oxidation, accompanied by the production of heat and light. |
| Density | The amount of matter in a given space or volume; a relationship between mass and volume |
| What are the three main element groups? | There are three main groups of elements: metals, non-metals and metalloids. |
| What are the predominate physical properties of element groups classified as metals? | Most elements are metals, and most metals are generally shiny, malleable and conduct heat and electricity easily. |
| What are the predominate physical properties of element groups classified as non-metals? | Non-metals are generally not shiny, not malleable and do not conduct heat or electricity easily. |
| What are the predominate physical properties of element groups classified as metalloids? | The metalloids exhibit intermediate properties of both metals and non-metals. |
| Metal | An element that is typically a hard, shiny solid, is malleable, and is a good conductor of heat and electricity |
| Non-metal | An element that is usually a gas or brittle solid at room temperature, is not malleable or ductile, is a poor conductor of heat and electricity, and is typically not shiny |
| Metalloid | An element that shares some properties of metals and some of non-metals |
| Chemical Property | Those characteristics that can be observed when a chemical reaction changes the identity of the substance, such as potential to rust, corrode, or combust |
| Luster | A property that describes having a shiny appearance or reflecting light |
| Conductivity | A property that describes if heat or electrical charges pass through the material easily |
| Malleability | A property that describes the ability of the material to be rolled or hammered into thin sheets |
| Magnetism | A property that describes if the material is magnetic |
| Ductility | A property that describes if the material has the ability to be pulled into thin wire without breaking |
| Brittle | Likely to break, snap, or crack when subjected to pressure |
Created by:
ckirkland
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