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- 1. Multiple ChoiceWhich of the following shows the correct way to balance the chemical equation?
Fe + O2 -> Fe2O34Fe + 3O2 -> 2Fe2O32 Fe + 3O2 -> Fe2O64 Fe + O6 -> 2Fe2O3None of the options are correctly balanced. - 2. Multiple ChoiceWhich of the following reactions is balanced?2CH4 + O2 -> CO2 + H2OCH4 + 2O2 -> CO2 + H2OCH4 + 2O2 -> CO2 + 2H2ONone of the chemical equations are balanced.
- 3. Multiple ChoiceHow many HCl molecules do you need to balance this equation?
Mg + __HCl ---> MgCl2 + H21234 - 4. Multiple ChoiceBalance this equation.
_CF4 + _Br2 -- _CBr4 + _F22,1,2,11,2,2,11,2,1,22,2,2,2 - 5. Multiple ChoiceWhich coefficients balance this equation:
NH3 + O2 ----> NO + H2O2,3,5,65,5,4,64,6,4,54,5,4,6 - 6. Multiple ChoiceWhat is the unit of measurement for the amount of a substanceVolumeMassConcentrationMoles
- 7. Multiple ChoiceWhat is true about the molar mass of chlorine gas?The molar mass is 35.45 gThe molar mass is 70.90 gThe molar mass is equal to 1 mole of chlorine atomsnone of the above.
- 8. Multiple Choice
What is the volume of liquid in this graduated cylinder?40.0 mL40.3 mL43.0 mL44.0 mL - 9. Multiple Choice
5,000 mg=____________grams
500 grams
50 grams
5 grams
5,000 grams
- 10. Multiple Choice
4,000 grams=_____________kg
40
400
4
4,000
- 11. Multiple Choice
9 g=______________mg
9 mg
900 mg
90 mg
9,000 mg
- 12. Multiple ChoiceHow many sig figs are there?
100.001345 - 13. Multiple ChoiceHow many sig figs are there?
1000000001910 - 14. Multiple ChoiceHow many sig figs are there?
0.004001356 - 15. Multiple ChoiceRound 1047.78 to three sig figs10410510501050.00
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