Counting Atoms Worksheet - Weebly



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Date:____________ Hr:_________

Ions & Isotopes Practice

Determine the number of protons, electrons, & neutrons for the following: Use your periodic table to help you. Label each arrow before you begin.

|Ion/Isotope/Both |Protons (p+) |Electrons (e-) |Neutrons (n0) |

|79Se -2 | | | |

|34 | | | |

|45Sc +3 | | | |

|21 | | | |

|13C -4 | | | |

|6 | | | |

|91Zr+4 | | | |

|40 | | | |

|104Ce +3 | | | |

|58 | | | |

|14C | | | |

|6 | | | |

|40Ca+2 | | | |

|20 | | | |

|36Cl-1 | | | |

|17 | | | |

|34S | | | |

|16 | | | |

|27Al+3 | | | |

|13 | | | |

Counting Atoms Practice

Complete the table below: The first one has been done for you as an example.

|Formula |List of atoms (elements) in the compound |# of each kind of atom |Total # of atoms |

|MgBr2 |Mg |1 |3 |

| |Br |2 | |

| | | | |

| | | | |

|Na3PO4 | | | |

| | | | |

| | | | |

| | | | |

|CO2 | | | |

| | | | |

| | | | |

| | | | |

|NH4Cl | | | |

| | | | |

| | | | |

| | | | |

|C6H12O6 | | | |

| | | | |

| | | | |

| | | | |

|(NH4)3PO4 | | | |

| | | | |

| | | | |

| | | | |

|Mg(OH)2 | | | |

| | | | |

| | | | |

| | | | |

|Ba3(PO4)2 | | | |

| | | | |

| | | | |

| | | | |

Classifying Chemical Reactions Practice

Classify the reactions as synthesis, decomposition, single displacement, double displacement, or combustion. Put a star next to the Acid-Base reaction for one bonus point.

|1.) 2 H2 + O2 ( 2 H2O | |

|2.) 2 H2O ( 2 H2 + O2 | |

|3.) Zn + H2SO4 ( ZnSO4 + H2 | |

|4.) 2 CO + O2 ( 2 CO2 | |

|5.) 2 HgO ( 2 Hg + O2 | |

|6.) 2KBr + Cl2 ( 2 KCl + Br2 | |

|7.) CaO + H2O ( Ca(OH)2 | |

|8.) AgNO3 + NaCl ( AgCl + NaNO3 | |

|9.) 2 H2O2 ( 2 H2O + O2 | |

|10.) Ca(OH)2 + H2SO4 ( CaSO4 + 2 H2O | |

|11.) 2 C4H10 + 13 O2 ( 8 CO2 + 10 H2O | |

|12.) 2 KClO3 ( 2 KCl + 3 O2 | |

|13.) HCl + NaOH ( NaCl + H2O | |

|14.) Mg + 2 HCl ( MgCl2 + H2 | |

|15.) 2 Al + 3 NiBr2 ( 2 AlBr3 + 3 Ni | |

|16.) 4 Al + 3 O2 ( 2 Al2O3 | |

|17.) 2 NaCl ( 2 Na + Cl2 | |

|18.) CaCl2 + F2 ( CaF2 + Cl2 | |

|19.) AgNO3 + KCl ( AgCl + KNO3 | |

|20.) N2 + 3 H2 ( 2 NH3 | |

|21.) 2 C6H14 + 19 O2 ( 12 CO2 + 14 H2O | |

|22.) (NH4)2SO4 + Ba(NO3)2 ( BaSO4 + 2 NH4NO3 | |

|23.) MgI2 + Br2 ( MgBr2 + I2 | |

|24.) SO3 + H2O ( H2SO4 | |

|25.) 6 KCl + Zn3(PO4)2 ( 3 ZnCl2 + 2 K3PO4 | |

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79Se -2

34

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