What is the main reason scientists use the flame test? a to determine the amount of metal ion present in a sample

b to determine the molecular mass of a metal ion present in a sample

c to make colorful fireworks

d to identify metal ions in samples

Identify which properties could correspond to solids, plasmas, or both. maintain a unique shape. collide infrequently with other particles. have very high velocities. conduct electricity. protons. have a low temperature. has long-range order.

Express the following number in scientific notation. 0.026890 =

A4.86 g piece of metal was placed in a graduated cylinder containing 15.5 ml of water. the water level rose to 17.3 ml. what is the density of the metal. i need the steps of how to solve it to so i can use a formula to work out other problems.