Cho hợp chất XY₂ tạo bởi 2 nguyên tố X, Y,Z, có hai đồng vị: ⁷⁹Y chiếm 55% số nguyên tử Y và đồng vị ⁸¹Y. Trong XY₂ phần trăm khối lượng của X là bằng 28,51% Tính nguyên tử khối trung bình của X, Y

Using the first volume and temperature reading on the table as v1 and t1, solve for the unknown values in the table below. remember to use the rules of significant figures when entering your numeric response.

What information does a complete ionic equation give that the balanced equation doesn’t show?

Which is true about metals used for jewelry, such as platinum and gold? a. they have low flammability. b. they have low reactivity. c. they have high flammability. d. they have high reactivity.