Balance las ecuaciones por el método de oxido reducción recuerde Indicar Oxidante, reductor, agente oxidante, agente reductor

1. HI + H2SO4 → SO2 + I2 + H2O

2. SO2 + O2 + CaCO3 → CaSO4 + CO2

3. PbS + Cu2S + HNO3 → Pb(NO3)2 + Cu(NO3)2 + NO2 + S + H2O

4. H2O2 + KMnO4 + H2SO4 → K2SO4 + MnSO4 + O2 + H2O

Which of the following is a testable hypothesis? a. if i brush my teeth, i will get fewer cavities than if i don't brush my teeth. b. green toothpaste tastes better than blue toothpaste or red toothpaste. c. smart, careful, healthy people always brush their teeth. d. it's wrong to not brush your teeth before you have an important conversation with someone.

Calculate the mass of silver needed to react with chlorine to produce 126g if silver chloride?

What best discribes the relationship between wavelength and frequency in a electromagnetic wave