Is a burning log an exothermic or endothermic event if the log is the system?

All are ways to combat water pollution except

What are the three signs that a chemical change has taken place

Which option is not a way that heat can flow? (I think this is Chemistry)

What is the blond spot

Which of the following is the best description of a chemical reaction

Compare how an increase in wavelength affects sounds and light waves.

The addition of an acid to water increases the [H30*) of the solution and increases the solution pH. True or False True False

31.65 mL volume of 1.07 M Fe (NO3) 3 is mixed with 44.96 mL of 0.79M Fe (NO3) 3 solution. Calculate the molar concentration of the final solution. Save rounding until the end.

At standard pressure, during which physical change does the potential energy decrease?

How are inner and outer planets different?