an ice cube is placed in the sun. later there’s a puddle of water. then later on the puddle is gone. is this a physical or chemical change?

Express the following number in scientific notation. 0.026890 =

How many miles of water are produced if 5.43 mol pbo2 are consumed

Precision can be defined as the o exact center of a data set. o reproducibility of a measured value. o correlation between two variables that are measured in a data set agreement between a measured value and an accepted value.