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- 1. Multiple ChoiceThe number of atoms you begin with in a chemical reaction ...must be the same as the number of atoms you end withmust be an even numbercan be different to the number you finish withchanges depending on how much energy is formed
- 2. Multiple Choice
Which type of reaction is:
2 NH3 + H2SO4 → (NH4)2SO4
SynthesisDecompositionSingle DisplacementDouble Displacement - 3. Multiple ChoiceWhich type of reaction is: C2H4 + 3 O2 → 2 CO2 + 2 H2OSynthesisDecompositionSingle DisplacementCombustion
- 4. Multiple Choice
Which type of reaction is:
2 K + MgBr2 → 2 KBr + Mg
SynthesisDecompositionSingle DisplacementDouble Displacement - 5. Multiple ChoiceProvides evidence that a chemical reaction has occurred.dissolvingmeltingformation of a gasbending
- 6. Multiple ChoiceWhich problem is balanced?PbO2 + 2H2--> H2SO4SO2 + H20 --> H2SO42Na + 2H2O --> 2NaOH + H22Na + 2H2O --> 2NaOH + H
- 7. Multiple ChoiceBalance this equation.
_CF4 + _Br2 -- _CBr4 + _F22,1,2,11,2,2,11,2,1,22,2,2,2 - 8. Multiple ChoiceIn a reaction A + B ----> C, reactant A has 5g and product C has 9g. How many grams does reactant B should have?4g5g9g14g
- 9. Multiple ChoiceIn the reaction AB-----> A + B reactant AB has 12g and product B has 5g. How many grams should product A have?17g2g7gNone of the above
- 10. Multiple Choice
In a chemical reaction, 4 grams of sodium must combine with how many grams of chlorine to produce 10 grams of table salt?
4 grams
6 grams
8 grams
10 grams
- 11. Multiple Choice
What is the part of the chemical equation in green called?
Fe + S → FeS
products
reactants
yield
input
- 12. Multiple ChoiceWhat two molecules are produced in a combustion reaction?CO2 + NH4SiO2 + H2OH2O + CO2CO2 + H2O2
- 13. Multiple Choice
When coal burns carbon dioxide is produced from the carbon in coal and the oxygen in air. Which of these is the best evidence that a chemical reaction occurs when coal burns?
The shape of the coal changes
Oxygen is present
A new substance is produced
Coal is made up of more than one element
- Answer choicesTagsAnswer choicesTags