1. Assume that the top of your head has a surface area of 25cm x 25 cm. How many newtons of force push on your head at sea level? 2. if you estimate this area to be 100 in^2 what is the force in pounds.

Balance and in which category does it fit in? single or double displacement or synthesis or decomposition? (a) k2 o → k + o2 (b) na + i2 → nai (c) cu(no3 )2 + naoh → cu(oh)2 + nano3 (d) kclo3 → kcl + o2 (e) ca(no3 )2 + hbr → cabr2 + hno3 (f) sn(oh)2 → sno + h2 o (g) p4 + n2 o → p4 o6 + n2 (h) fe + al2 (so4 )3 → feso4 + al (i) alcl3 + na2 co3 → al2 (co3 )3 + nacl (j) c3 h6 + o2 → co2 + h2 o

What is the empirical formula of a compound that is 50.7% antimony and 49.3% selenium ?

Which is an example of a highly unstable isotope that is often used in fission reactions?