Question

who will say all 4 for them only i will mark brainliest and thanks and 5 stars​

Answer 1

7. Formic acid

8. 3×(10)^8 m/s in vacuum or air

9. 6.626×(10)^(-34) J s

10. Density of Sr is the average of densities of Ca and Ba, according to Dobereiner's law of triads.

Density of Sr = (1.55 + 3.50)/2 = 5.05/2 = 2.525