For which of the following activities might you want to hire a chemist?
Answer: D. testing a rock sample for gold content
Which of the following procedures involves a physical change in one of the substances?
Answer: C. separating a salt solution by evaporating the water
A matter in the solid phase has a fixed shape and volume.
Answer: B. Allow light to pass through. :)
Answer:option A
Multiple reactants are used to form one product.
Answer:
2MnO2 + H2O => Mn2O3 + 2OH is the correct balanced equation.
