Balancing chemical equations worksheet instructions: after you have read the section in the text on balancing chemical equations and viewed the tutorial on the topic, then balance the equations below. insert the coefficients in the spaces provided. 1. h2 + o2 => __2_ h2o 2. n2 + h2 => nh3 3. s8 + o2 => so3 4. n2 + o2 => n2o 5. hgo => hg + o2 6. co2 + h2o => c6h12o6 + o2 7. zn + hcl => zncl2 + h2 8. sicl4 + h2o => h4sio4 + hcl 9. na + h2o => naoh + h2 10. h3po4 => h4p2o7+ h2o

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.