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Science Chp 1 Test
| Question | Answer |
|---|---|
| What is the smallest part of an element | atom |
| Most matter you find in your environment is in the form of | mixtures |
| Which process changes matter into one or more new substances | chemical change |
| Water Vapor in the air turns to liquid water in the form of rain. This is an example of a | physical change |
| The force that holds atoms together is called a | chemical bond |
| What is the result when chemical bonds break and new bonds form | a chemical reaction |
| A solid that forms from solution during a chemical reaction is called a(n) | precipitate |
| The only evidence for a chemical reaction is | the production of new materials |
| A shorter, easier way to show chemical reactions, using symbols instead of words, is called a | chemical equation |
| The substances listed on the left side of a chemical equation are the | reactants |
| In chemical reactions, what does the principle of conservation of mass mean | matter is not created or destroyed |
| When 2 or more substances combine to make a more complex compound, the process is called a | synthesis reaction |
| A bottle of hydrogen peroxide that eventually turns into a bottle of water and oxygen gas is an example of a | decomposition reaction |
| A chemical reaction that absorbs energy in the form of heat is described as | endothermic |
| The minimum amount of energy that has to be added to start a reaction is the | activation energy |
| What 3 things increases the number of particles of a substance available to react in a chemical reaction | concentration, surface area, and mass |
| A material used to decrease the rate of a chemical reaction is an | inhibitor |
| What three things are necessary to start and maintain a fire | fuel, oxygen, and heat |
| A rapid reaction between oxygen and a fuel is known as | combustion |
| In what way can a fire be brought under control | remove oxygen |
| Water affects most fires by | cooling the fire and preventing contact between oxygen and fuel |
| What is the best form of fire safety | fire prevention |
| The best way to put out a small kitchen fire is to | use a home fire extinguisher |
| Carbon dioxide is an example of an | compound |
| Each element is represented by a one-letter or two-letter | symbol |
| In an equation, numbers often appear in front of a chemical formula. These numbers tell you the | number of molecules or atoms of each substance in the reaction |
| Every chemical reaction involves a change in | energy |
| Chemicals that act as biological catalysts by speeding up reactions in living things are | enzymes |
| The simplest type of substance that cannot be broken down into any other substance is a(n) | element |
| A __ is a substance made of two or more elements chemically combined in a specific ratio | compound |
| A change that produces a new substance is a __ change | chemical |
| In a chemical reaction, ___ ___ are formed or broken | chemical bonds |
| A chemical reaction can be identified by observing changes in the ___ of matter | properties |
| The materials present at the beginning of a chemical reaction are called the ___ | reactants |
| The amount of matter in a chemical reaction ___ | stays the same |
| ____ is the process of making a more complex compound from simpler substance | Synthesis |
| Chemical reactions that absorb energy are said to be ___ | endothermic |
| The rate of a chemical reaction is ___ of temperature | dependent |
| A gas necessary for combustion to take place is __ | oxygen |
| A(n) __ is a substance that cannot be broken down into any other substance by wither chemical or physical means | element |
| In a(n) ____ change, elements and/or compounds rearrange to form different materials | chemical |
| Atoms are held together by forces known as | chemical bonds |
| A precipitate is a ___ that forms from solution during a chemical reaction | solid |
| A subscript shows the number of ___ of an element in a molecule | atoms |
| The principle of ___ states that during a chemical reaction, matter is not created or destroyed. | conservation of mass/mattter |
| 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 |
| A chemical reaction that releases energy in the form of heat is a(n) ____ reaction | exothermic |
| The ___ is the amount of one material present in a given volume of another material | concentration |
| A fuel is a material that will release __ when it burns | energy |
| When added to a fire, water ___and prevents the fuel from coming in contact with oxygen | cools down the fire |
| One of the most effective ways to fight a small fire is to use a | fire extinguisher |
| Two or more atoms may combine to form a | molecule |
| The process of dissolving sugar in water is a __ change | physical |
| The gas production when acid is added to a sample of chalk is an indication of a ___ reaction | chemical |
| The ___ of a compound shows the ratio of elements present in the compound | chemical formula |
| In a ____ reaction, the products are simpler substances than the reactant | decomposition |
| The ___ is the minimum amount of energy that must be added to start a chemical reaction | activation energy |
| A material used to decrease the rate of a reaction is called a(n) | inhibitor |
| A wet log will not burn easily because a large amount of __ must be added to the log to evaporate the water | heat; thermal energy |
| What are the 5 signs of a chemical change | Color change, temperature change, property change, production of a gas, production of a precipitate |
| What are 6 things that affect the rate of a chemical reaction | Quantity of the reactants, concentration, temperature, surface area, enzymes, inhibitor |
Created by:
16asantiago