Is C2H2 + 2H2 C2H6 a substitution reaction

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

Determine the percent sulfuric acid by mass of a 1.61 m aqueous solution of h2so4. %

Which of the following is a conclusion that resulted from ernest rutherford’s scattering experiment? (will mark brainliest) a. the nucleus is negatively charged b. the atom is a dense solid and is indivisible c. the mass is conserved when atoms react chemically d. the nucleus is very small and the atom is mostly empty space