What are the two rules for deciding the number of significant digits in the answer to a calculation?

Which of these properties, used alone, would be least useful in identifying most minerals? a. color b. luster c. streak d. density

Will give brainliest it is a lab from k12 here is the linkfor each metal that participated in a chemical change, write the type of metal it is, based on your examination of the periodic table. type your answer here. (score for question 3: of 5 points) were there any metallic compounds that did not react with either the acid or the base? write the type of metal, based on your examination of the periodic table. type your answer here. (score for question 4: of 5 points) make a general statement about the reactivity of the metals in this experiment. type your answer here.

Areaction is first order with respect to reactant x and second order with respect to reactant y. which statement describes the rate law for this reaction?