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Definition
| An element is matter that cannot be divided into smaller particles and retain its properties. |
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| can elements be seperated? |
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Definition
No, elements cannot be separated into simpler substances by physical or chemical means. |
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Term
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Definition
| Each element contains only one type of atom. The atoms of each element are different from the atoms of all other elements. All elements of one particular element are the same. for example- all carbon atoms are the same but they are different from the atoms of all other elements. |
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Finish the sentance: Elements include substances such as..... |
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Definition
Elements include substances such as iron, helium, copper, silicon, carbon, and uranium. |
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does each element have its own set of properties? |
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Definition
| Each element has its own set of properties. |
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Term
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Definition
| compounds are substances in which 2 or more elements are held together by chemical bonds. |
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Term
how does a chemical reaction take place? |
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Definition
when substances combine and form a new stubstance, a chemical reaction has taken place |
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Term
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Definition
| The substances the undergo the chemical change are called reactants |
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Definition
| The new substance that is fromed is called the product. |
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Term
| when does a chemical reaction take place? |
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Definition
| A chemical reaction takes place only when a new substance is formed. |
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| what are some examples of chemical reactions? |
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Definition
| Wood burning, food cooking, grass growing, and cars rusting are all examples of chemical reaction. |
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Term
| Out of the roughly different elements, only about are . |
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Definition
| Out of the roughly different elements, only about half are common |
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| what can elements do? explain. |
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Definition
| These elements,however, can combine in many ways, forming many different compounds. These compounds can react to form thousands of products. |
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Term
| what are other ways a chemical reaction can occur? |
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Definition
| A chemical reaction also occurs when a single substance breaks apart into two new substances. a third type of chemical reaction occurs when one element replaces another element in a compound. |
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i cant come up with a question for this so just flip the card over. |
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Definition
| When a chemical change is occured, we say there was a chemical reaction. Burning is always a chemical change. |
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| what must happen in order to break apart a compound? |
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Definition
| In order to break apart a compound, it is necessary to have a chemical change.Mixtures,however, can be separated by physical changes. |
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| explain what happens when the new substances are produced. |
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Definition
| The new substances produced by a chemical change have their own set of properties. These properties are different from those of the original substances that reacted, since those substances are no longer present as seperate subsatances/ |
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Term
| what is the symbol for sodium? |
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Definition
| Na is the symbol for sodium. |
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| what is the symbol for chlorine? |
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Definition
| Cl is the symbol for chlorine. |
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Term
| What is the symbol for sodium chlorine? |
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Definition
| NaCl is the symbol for sodium chlorine. |
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Term
| what happens when sodium and chlorine combline in a chemical reaction? |
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Definition
| When sodium and chlorine combine in a chemical reaction, they produce sodium chlorine known as table salt. |
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Term
| what happens during a chemical reaction? |
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Definition
| During a chemical reaction, the atoms are rearranged to form new substances. This means breaking the chemical bonds that exist and forming new bonds. |
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Term
| what is always needed to start the chemical reaction? |
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Definition
| Energy is always needed to start the chemical reaction. |
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Term
| Many chemical changes must be started b the addition of , in the form of heat, , or . |
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Definition
| Many chemical changes must be startedby the addition of energy, in the form of heat, light, or electricity. |
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Term
| what is a exergonic reaction? |
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Definition
| an exergonic reaction is energy required to break bonds is less than the energy released from new bonds; energy given off is usually light. |
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Term
| what is an endergonic reaction? |
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Definition
| an endergonic reation is more energy is required to break bonds than to form new ones; needs energy for the reaction to occur. |
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Term
| what is an endothermic reaction? |
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Definition
| an endothermic reaction is if energy needed heat, the reaction is endothermic. |
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Term
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Definition
| a catalyst speeds up a chemical reaction without itself being permanantly damaged. |
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Term
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Definition
| an inhibitor prevents or slows a chemical reaction or interferes with a catalyst's reaction. |
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Term
decide if each substance is a compound or an element: - sugar
- hydrogen
- copper
- carbon
- rust
- oxygen
- salt
- water
- iron sulfide
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Definition
- sugar- compound
- hydrogen- element
- copper- element
- carbon- element
- rust- compound
- oxygen- element
- salt- compound
- water- compound
- iron sulfide- compound
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