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A rapid reaction between oxygen and a fuel is known as...
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The only sure evidence for a chemical reaction is...
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Science Ch 4
Chemical Reactions Test
| Question | Answer |
|---|---|
| A rapid reaction between oxygen and a fuel is known as... | combustion |
| The only sure evidence for a chemical reaction is... | the production of one or more new substances |
| What happens when chemical bonds break and new bonds form? | a chemical reaction |
| Every chemical reaction involves a change in... | energy |
| CaCO3 represents a chemical... | formula |
| What type of reaction is FeS + 2HCl --->FcCl2 + H2S? | a double replacement reaction |
| Which two processes could be considered opposites? | a synthesis reaction and a decomposition reaction |
| A material used to decrease the rate of a chemical reaction is an... | inhibitor |
| The principle of conservation of mass is true... | for reactions in both open and closed systems |
| In what way can a fire be brought under control? | Remove oxygen |
| When a chemical reaction takes place in an open system, | matter can enter from or escape to the surroundings |
| The number placed below an element's symbol in a chemical formula is called a... | subscript |
| Chemicals that act as biological catalysts by speeding up reactions in living things are... | enzymes |
| What is the best form of fire safety? | fire prevention |
| The best way to put out a small kitchen fire is to... | cover it or use a home fire extinguisher |
| Which of the following is a balanced chemical equation? | 2Fe2O3 + 3C ---> 4Fe + 3CO2 |
| A chemical equation that shows the same number of each kind of atom on both sides of the equation is said to be... | balanced |
| A shorter, easier way to show chemical reactions, using symbols instead of words, is called a... | chemical equation |
| Which is the correct chemical equation for the following statement? Sodium reacts with oxygen in a 2 to 1 ratio to produce sodium oxide. | 2Na + O2 ---> Na2O |
| In a chemical equation, numbers often appear in front of a chemical formula. These numbers tell you the... | number of molecules or atoms or each substance in the reaction |
| In chemical reactions, what does the principle of conservation of mass mean? | matter is not created or destroyed |
| The minimum amount of energy that has to be added to start a reaction is the... | activation energy |
| Anything that has mass and takes up space is considered... | matter |
| A bottle of hydrogen peroxide that eventually turns into a bottle of water and oxygen gas is an example of a... | decomposition reaction |
| Which of the following is NOT a correct inference that you can make about the burning of gasoline - Chemical bonds are broken and others are formed; New substances are produced; The reaction is a physical change. | The reaction is a physical change |
| Which of the following does NOT increase the number of particles of a substance available to react in a chemical reaction - increasing the concentration; increasing the surface area; adding a catalyst | adding a catalyst |
| Chemistry is... | the study of matter and how matter changes |
| A chemical reaction that absorbs energy in the form of heat is described as... | endothermic |
| Which of the following is an example of how to supply activation energy to begin a reaction? | Heat the reaction flask on a hot plate |
| The substances listed on the left side of a chemical equation are the... | reactants |
| The rate of a chemical reaction is _________ of temperature. | dependent |
| A chemical reaction may be detected by observing changes in the ... | properties of matter |
| _______ is the process of making a more complex compound from simpler substances. | Synthesis |
| A change that produces a new substance is a... | chemical change |
| A gas necessary for combustion to take place is... | oxygen |
| In a chemical reaction, _________ are formed or broken. | chemical bonds |
| The home fires that cause the most deaths start from carelessness with ________ | cigarettes |
| Chemical reactions that absorb energy are said to be _________. | endothermic |
| The materials present at the beginning of a chemical reaction are called the _________. | reactants |
| When added to a fire, water ______ and prevents the fuel from coming in contact with oxygen. | cools |
| In a chemical equation, the substances written on the right side of the arrow are called _________. | products |
| In a chemical equation, a ________ tells you how many atoms or molecules of a reactant or a product take part in a reaction. | coefficient |
| The _________ is the minimum amount of energy that must be added to start a chemical reaction. | activation energy |
| A fuel is a material that will release _______ when it burns. | energy |
| The process of solid ice changing into liquid water is a ________ change. | physical |
| A material used to decrease the rate of a reaction is called an _________. | inhibitor |
| The ________ is the amount of one material present in a given volume of another material. | concentration |
| ________ changes occur when bonds form between atoms, or when bonds break and new bonds form. | Chemical |
| A chemical reaction that releases energy in the form of heat is an ________ reaction. | exothermic |
| One of the most effective ways to fight a small fire is to use a __________. | fire extinguisher |
| The principle of ______________ states that during a chemical reaction, matter is not created or destroyed | Conservation of Mass |
| A burning match is an example of an ____________ where matter can enter from or escape to the surroundings. | open system |
| A wet log will not burn easily because a large amount of _________ must be added to the log to evaporate the water. | heat |
| The production of a gas when acid is added to a sample of chalk is an indication of a __________ reaction. | chemical |
| A reaction in which one element replaces another in a compound or in which two elements in different compounds trade places is called a __________ reaction. | replacement |
| In a _________ change, elements and/or compounds rearrange to form new substances. | chemical |
| In a __________ reaction, the products are simpler substances than the reactant. | decomposition |
| The ______________ of a compound shows the ratio of elements present in the compound. | chemical formula |
| A precipitate is a _________ that forms from solution during a chemical reaction. | solid |
| a symbolic way to show a chemical reaction | chemical equation |
| energy needed to start a chemical reaction | activation energy |
| produces a new substance | chemical change |
| speeds up a chemical reaction | catalyst |
| substances undergo chemical change | chemical reaction |
| symbols and subscripts that represent a compound | chemical formula |
| the force that holds atoms together as compounds | chemical bond |
| the smallest particle of an element | atom |
| a chemical reaction that breaks down one substance into two or more substances | decomposition |
| a number placed in front of a formula | coefficient |
| combining fuel with oxygen to produce fire | combustion |
| matter cannot be created or destroyed during a chemical reaction | conservation of mass |
| the amount of matter in a given volume | concentration |
| two or more elements chemically combined | compound |
| a biological catalyst | enzyme |
| a chemical reaction that releases heat | exothermic reaction |
| a substance that releases energy when it burns | fuel |
| a substance that slows a chemical reaction | inhibitor |
| does not create a new substance | physical change |
| two or more atoms | molecule |
| two or more substances not chemically combined | mixture |
| a chemical reaction where one substance REPLACES another in a compound | REPLACEment reaction |
| a chemical reaction where two or more substances combine to form one substance | synthesis |
| a mixture with substances spread evenly | solution |
| a number in a formula that tells the number of atoms of a particular element | subscript |
| a solid that forms from solution during a reaction | precipitate |
| letters used to identify elements | symbol |
| substances formed during a chemical reaction | products |
| substances that enter into a chemical reaction | reactants |
| cannot be broken down in to a simpler substance | element |
Created by:
8thgraders