Which of the following reactions is balanced?
o a. 2cacl2 + h2co3 = caco3 + hci
o b. cacl2 + 2h2co3 > caco3 + hci
oc. cacl2 + h2co3 → 2caco3 + hcl
o d. cacl2 + học0g - caco3 + 2hci
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For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

Which of the following would be an accurate picture of the earth during the summer time of the northern hemisphere?

The reactions shown here can be combined to make the overall reaction c(s) + h2o(g) ⇌ co(g) + h2(g) by reversing some and/or dividing all the coefficients by a number. a. c(s) + o2(g) → co2(g) k=1.363×10^69 b. 2 h2(g) + o2(g) → 2 h2o(g) k=1.389×10^80 c. 2co(g) + o2 (g) → 2 co2(g) k=1.477×10^90