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Froggy Jumps SCIENCEVersión en línea from your study guide to help with test por LEANDREA WILSON 1 the law of conservation of mass states a mass is always added durning a chemical change b mass is not lost or created durning a chemical change c mass is always lost durning a chemical change 2 the equation H2+ H2O--> is unbalanced. when balanced what is the correct coefficient for O2 a 4 b 2 c 1 3 which statement is true regarding the chemical equation below 2CH4+ 4O2--> CO2+ 4 H20 a the 4 in front of the oxygen on the product side needs to be a 6 in order to be balanced b the equation is balanced c the carbon dioxide on the product side needs a 2 in front of it in order for it to be balanced 4 classify the chemical reaction below CH3CH2OH+ 3O2--> 2CO2+ 3H2O a single displacement b double displacement c combustion 5 the compounds before the arrow are called ___ and the compounds after the arrow are ___ a reactants, products b products, reactants c coefficients, subscripts 6 balance and classify ( no right answer look at study guide 6-10 a 6, NH3-->N2+ H2 b 7. KOH+Co3(PO4)2-->K3PO4+ Co(oh)2 c FeO4+ H2--> Fe+ H2O 7 balance and classify ( no right answer look at study guide ) a 9. P+O2-->P2O5 b 10. NaCI + H2o--> HCI + NaOH c 8 each substance to the right of the arrow in a chemical equation is an a catalyst b product c reactant 9 the number that go before symbols and formulas in a chemical equation are a coefficients b catalysts c subscripts 10 substances that speed up chemical reactions are called a reactants b products c catalysts 11 a ______ chemical equation ha the same number of atoms of each elements on each side of the equation a simple b balanced c complex 12 if something is burned a________ reaction has occurred a synthesis b single displacement c combustion 13 why does an increases in temperature result in an increase in reaction rate a it raises the activation energy b it causes the molecules to increase in size c it caused an increase in the number of particle collisions 14 if energy must be added to a chemical reaction for the reaction to take place the reaction is __ a endergonic b exothermic c endothermic 15 in a chemical equation the symbol that means dissolved in water is _____ a i b g c aq 16 what type of reaction is the following chemical reaction CH3CH2OH+ 3O2-->2CO2+3H2O a synthesis b double displacement c combustion 17 which chemical. reaction represents a double-displacement reaction a 2KCIO+ CI2-->2NaCI b Zn+2HCI--> ZnCI1+H1 c NaOH+HCI-->NaCI+ H2O 18 a teacher wants to demonstrate a chemical reaction for her students, which activity below would best demonstrate a chemical reaction a placing metal in an acid to create gas b filling a balloon with helium gas c measuring the densities of water and ice 19 when a wood fire burns, it releases heat into the environment, this type of reaction is ___ a endothermic b exothermic c endergonic 20 the law of conservatio of mass states a mass never stays constant b mass is always added during a chemical change c mass is not lost or created during a chemical change 21 which of the following observation does NOT indicate that a chemical reaction has occurred a formation of a precipitate b production of a gas c state of matter change 22 all of the actions below will increase the rate of a reaction EXCEPT a stirring b putting the substances in a refrigerator c crushing the substance into tiny pieces 23 which of the. following is a CORRECTLY balanced chemical equation a CI2+ 2NaI--> 2NaCI+I2 b CL2+NaI-->NaCI+I2 c 2CI2+NaI-->2NaCI+I2 24 which situation provides the best evidenve that a chemical reation is taking place a a metal strip bends when heated b a solution freezes in the freezer c two solutions mixedina beakerproduce a solid 25 a substance that is an ingredient in a chemical reaction is called a ______ a catalyst b product c reactant 26 in a reaction in which hydrogen reacts with oxygen to produce water, which substances are the reatants a hydrogen only b oxygen only c both hydrogen and oxygen 27 which of the following is NOT a exmple of a chemical change a iron rusting b cutting paper c an apple ripening 28 which of the following equations best represets magnesium reacting with chlorine to produce magnesium chlorine a Mg-->CI2 + MgCI2 b MgCI2+Mg--CI2 c Mg+CI2-->MgCI2 29 how many atoms of oxygen are represented in 2Ca(NO3)2 a 3 b 6 c 12 30 the symbol (s) written after a formula in a chemical equation stands for a solid b soluble c solution 31 a solid produced from two liquids in a double displacement chemical reaction is called a a reactant b precipitate c crystal 32 to balance a chemical equation it may be necessary to adjust the _____ a coefficients b subscripts c superscripts 33 balancing and classifying (26-28) study guide a 26. ___LiCI + ____ Br2-- >. _____LiBr + ____ CI2 b 27. ____KCIO3-->___KCI + ___O2 c 28. ____ N2+____O2--> ___N2O5 34 balancing and classifying (29-31) a 29. ___CH4 +__O2--> ____CO2+ ____H2O b 30. ___ Ca(OH)2 + __H3PO4--> ___Ca(PO4)2 +___H20 c 31. ___NaCI + ____KOH-->vNaOH +____KCI

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Froggy Jumps

SCIENCEVersión en línea

por LEANDREA WILSON

the law of conservation of mass states

the equation H2+ H2O--> is unbalanced. when balanced what is the correct coefficient for O2

which statement is true regarding the chemical equation below 2CH4+ 4O2--> CO2+ 4 H20

classify the chemical reaction below CH3CH2OH+ 3O2--> 2CO2+ 3H2O

the compounds before the arrow are called ___ and the compounds after the arrow are ___

balance and classify ( no right answer look at study guide 6-10

balance and classify ( no right answer look at study guide )

each substance to the right of the arrow in a chemical equation is an

the number that go before symbols and formulas in a chemical equation are

substances that speed up chemical reactions are called

a ______ chemical equation ha the same number of atoms of each elements on each side of the equation

if something is burned a________ reaction has occurred

why does an increases in temperature result in an increase in reaction rate

if energy must be added to a chemical reaction for the reaction to take place the reaction is __

in a chemical equation the symbol that means dissolved in water is _____

what type of reaction is the following chemical reaction CH3CH2OH+ 3O2-->2CO2+3H2O

which chemical. reaction represents a double-displacement reaction

a teacher wants to demonstrate a chemical reaction for her students, which activity below would best demonstrate a chemical reaction

when a wood fire burns, it releases heat into the environment, this type of reaction is ___

the law of conservatio of mass states

which of the following observation does NOT indicate that a chemical reaction has occurred

all of the actions below will increase the rate of a reaction EXCEPT

which of the. following is a CORRECTLY balanced chemical equation

which situation provides the best evidenve that a chemical reation is taking place

a substance that is an ingredient in a chemical reaction is called a ______

in a reaction in which hydrogen reacts with oxygen to produce water, which substances are the reatants

which of the following is NOT a exmple of a chemical change

which of the following equations best represets magnesium reacting with chlorine to produce magnesium chlorine

how many atoms of oxygen are represented in 2Ca(NO3)2

the symbol (s) written after a formula in a chemical equation stands for

a solid produced from two liquids in a double displacement chemical reaction is called a

to balance a chemical equation it may be necessary to adjust the _____

balancing and classifying (26-28) study guide

balancing and classifying (29-31)

the compounds before the arrow are called _ and the compounds after the arrow are _