Chemical Equations: Writing and Balancing Chemical Equations ( Form 2, Chemistry )

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Balancing chemical equations basics.

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Chemical Equations: Writing and Balancing Chemical Equations ( Form 2, Chemistry )


Froggy Jumps Chemical Equations: Writing and Balancing Chemical Equations ( Form 2, Chemistry )Version en ligne Balancing chemical equations basics. par YAKILI LMS 1 What symbol is used to indicate a reactant in a chemical equation? a Arrow b Plus sign c Equals sign 2 In a chemical equation, what must be true about the atoms on both sides? a They can differ b They must balance c Only metals must balance 3 What is the term for a chemical equation with the same number of atoms of each element on both sides? a Composite equation b Balanced equation c Unbalanced equation 4 Which number is adjusted to balance equations? a subscripts b Coefficients c Molar mass 5 What does a subscript in a chemical formula indicate? a Number of atoms of an element in a molecule b Charge of an ion c Amount of substance 6 Which of the following is a product in the reaction: H2 + O2 -> ? a H2O2 b HO c H2O 7 Balance the equation: H2 + Cl2 -> HCl a H2 + Cl2 -> 2HCl b 2H2 + Cl2 -> 2HCl c H2 + Cl2 -> HCl 8 What is the first step in balancing an equation? a Write the skeleton equation b Balance oxygen first c Add coefficients randomly 9 In Fe + O2 -> Fe2O3, how many Fe atoms are in the balanced equation? a 4 b 6 c 2 10 In the reaction Na + H2O -> NaOH + H2, what is the product containing sodium? a NaOH b NaH c Na2O 11 What does balancing ensure for mass? a Different mass on each side b Only charge balance c Same mass of each element on both sides 12 Which is a diatomic molecule? a H2O b O2 c CO2 13 Balance this equation: Al + O2 -> Al2O3 a 4Al + 3O2 -> 2Al2O3 b 2Al + O2 -> Al2O3 c Al + O2 -> Al2O3 14 Which law underpins balancing chemical equations? a Avogadro's law b Law of conservation of mass c Law of definite proportions 15 Which is a product in the equation N2 + 3H2 -> 2NH3? a H2N b N2H3 c NH3 16 What does a coefficient multiply in a formula? a The charge of ions b The number of molecules or units c The total mass 17 Balance this: C + O2 -> CO2 a C + O2 -> CO2 b 2C + O2 -> CO2 c C + O -> CO2 18 Which element balance is usually adjusted last? a Oxygen b Carbon c Hydrogen 19 In the reaction Fe + S -> FeS, what is the product? a FeS2 b FeS c SFe 20 Which type of reaction forms a solid as product? a Decomposition b Precipitation c Combustion 21 What is the product when HCl reacts with NaOH? a NaCl + H2O b NaOH2 + Cl2 c NaClO + H2 22 Balance this: KMnO4 + H2C2O4 -> K2CO2 + MnO2 + CO2 + H2O a Unbalanced; skip complex here b Balanced; not needed c Balanced with simple coefficients 23 Which type of equation shows reactants and products as formulas only? a Wordless molecular equation b Net ionic equation c Ionic equation 24 What is a spectator ion? a The ion that reacts b A gas ion c An ion not involved in the reaction 25 Balance: Na2SO4 + BaCl2 -> NaCl + BaSO4 a Na2SO4 + BaCl2 -> 2NaCl + BaSO4 b Na2SO4 + BaCl2 -> Na2Cl + BaSO3 c Na2SO4 + BaCl2 -> NaCl + BaSO3 26 What does the term 'stoichiometry' refer to? a Color change b Quantities in a chemical reaction c State of matter 27 Which gas is typically produced in metal–acid reactions? a Hydrogen b Nitrogen c Oxygen 28 Balance this: Cu + AgNO3 -> Cu(NO3)2 + Ag a Cu + 2AgNO3 -> Cu(NO3)2 + 2Ag b Cu + AgNO3 -> CuNO3 + Ag2 c Cu + AgNO3 -> Cu(NO3)2 + Ag 29 Which statement is true about balancing equations? a Hydrogen never balances b All elements must balance c Only carbon must balance 30 In balancing, what does a coefficient of 2 in front of H2O mean? a Two molecules of water b Two atoms of water c Two moles of water 31 What is the product of combustion of methane (CH4 + O2)? a CH4O2 + H2 b CO2 + H2O c CH4O + CO2 32 Which side should have the same total mass as the other side? a Both sides b Only one side c Neither side 33 Balance this: N2 + H2 -> NH3 a 2N2 + 3H2 -> 2NH3 b N2 + H2 -> NH3 c N2 + 3H2 -> 2NH3 34 What is the role of a catalyst in a reaction equation? a Speeds up the reaction without permanent change b Consumed in reaction c Slows down the reaction 35 Which type of equation shows state symbols? a Net ionic equation b Molar equation c A complete ionic equation 36 Balance this: C3H8 + O2 -> CO2 + H2O a C3H8 + 3O2 -> CO2 + H2O b C3H8 + O2 -> CO2 + H2O c C3H8 + 5O2 -> 3CO2 + 4H2O 37 What indicates the energy change in a reaction equation? a A circle symbol b A star symbol c A delta/triangle symbol 38 Which change occurs when balancing equations? a Only coefficients may change b Subscripts may change c Atoms may vanish 39 In CaCO3 -> CaO + CO2, which process occurs? a Decomposition b Single replacement c Combination 40 What is the product of S + F2 -> SF6? a SF5 b SF6 c S2F6 41 Which is a balanced form of: Fe + Cl2 -> FeCl3? a 2Fe + 3Cl2 -> 2FeCl3 b 2Fe + Cl2 -> FeCl3 c Fe + Cl2 -> FeCl3 42 What does a balanced equation obey for each element? a Conservation of color b Conservation of charge c Conservation of atoms 43 Which is NOT a common product in acid–base neutralization? a Hydrogen gas b Salt c Water 44 Balance this: Na + H2O -> NaOH + H2 a 2Na + H2O -> NaOH + H2 b 2Na + 2H2O -> 2NaOH + H2 c Na + H2O -> NaOH + H2 45 Which type of reaction involves a single element replacing another in a compound? a Single replacement b Synthesis c Double replacement 46 Balance this: KClO3 -> KCl + O2 a 2KClO3 -> 2KCl + 3O2 b KClO3 -> KCl + O2 + O2 c KClO3 -> KCl + O2 47 Which rule helps decide coefficients when balancing water formation? a Carbon must balance first b Hydrogen and oxygen must balance last c Always start with metals 48 What is missing in a skeleton equation? a Coefficients b Catalysts c State symbols 49 Which reaction type forms water as a product? a Precipitation b Combustion c Decomposition 50 Balance this: Mg + HCl -> MgCl2 + H2 a MgCl2 + H2 -> Mg + 2HCl b Mg + HCl -> MgCl + H2 c Mg + 2HCl -> MgCl2 + H2

Chemical Equations: Writing and Balancing Chemical Equations ( Form 2, Chemistry )

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Chemical Equations: Writing and Balancing Chemical Equations ( Form 2, Chemistry )Version en ligne

par YAKILI LMS

What symbol is used to indicate a reactant in a chemical equation?

In a chemical equation, what must be true about the atoms on both sides?

What is the term for a chemical equation with the same number of atoms of each element on both sides?

Which number is adjusted to balance equations?

What does a subscript in a chemical formula indicate?

Which of the following is a product in the reaction: H2 + O2 -> ?

Balance the equation: H2 + Cl2 -> HCl

What is the first step in balancing an equation?

In Fe + O2 -> Fe2O3, how many Fe atoms are in the balanced equation?

In the reaction Na + H2O -> NaOH + H2, what is the product containing sodium?

What does balancing ensure for mass?

Which is a diatomic molecule?

Balance this equation: Al + O2 -> Al2O3

Which law underpins balancing chemical equations?

Which is a product in the equation N2 + 3H2 -> 2NH3?

What does a coefficient multiply in a formula?

Balance this: C + O2 -> CO2

Which element balance is usually adjusted last?

In the reaction Fe + S -> FeS, what is the product?

Which type of reaction forms a solid as product?

What is the product when HCl reacts with NaOH?

Balance this: KMnO4 + H2C2O4 -> K2CO2 + MnO2 + CO2 + H2O

Which type of equation shows reactants and products as formulas only?

What is a spectator ion?

Balance: Na2SO4 + BaCl2 -> NaCl + BaSO4

What does the term 'stoichiometry' refer to?

Which gas is typically produced in metal–acid reactions?

Balance this: Cu + AgNO3 -> Cu(NO3)2 + Ag

Which statement is true about balancing equations?

In balancing, what does a coefficient of 2 in front of H2O mean?

What is the product of combustion of methane (CH4 + O2)?

Which side should have the same total mass as the other side?

Balance this: N2 + H2 -> NH3

What is the role of a catalyst in a reaction equation?

Which type of equation shows state symbols?

Balance this: C3H8 + O2 -> CO2 + H2O

What indicates the energy change in a reaction equation?

Which change occurs when balancing equations?

In CaCO3 -> CaO + CO2, which process occurs?

What is the product of S + F2 -> SF6?

Which is a balanced form of: Fe + Cl2 -> FeCl3?

What does a balanced equation obey for each element?

Which is NOT a common product in acid–base neutralization?

Balance this: Na + H2O -> NaOH + H2

Which type of reaction involves a single element replacing another in a compound?

Balance this: KClO3 -> KCl + O2

Which rule helps decide coefficients when balancing water formation?

What is missing in a skeleton equation?

Which reaction type forms water as a product?

Balance this: Mg + HCl -> MgCl2 + H2