A liquid is heated and a solid forms at the bottom of the beaker. Is this a physical or chemical change?

Explain why the radius of an atom cannot be measured directly. (6.3)

Yousef measured the height of each seedling on day 1 and day 7. These are his results. Group Seedling Increase in height/mm A no water 6.5 0.5 0.5 0.5 5.5 B 2 cm water Height of seedling/mm Day 1 Day 7 - 6.0 5.5 6.0 6.0 5.5 7.5 6.0 8.0 6.0 8.5 6.0 9.

How many valence electrons does the neutral Mg atom have?

Consider the following unbalanced equation: Li2S (aq) + Bi (NO3) 3 (aq) → LiNO3 (aq) + Bi2S3 (s) If 20.5 moles of Li2S (aq) reacts with an excess of Bi (NO3) 3 (aq), what is the theoretical yield of LiNO3 (aq) in moles?

When the stopper is removed from a partly filled bottle containing solid and liquid acetic acid at 16.7 °c, a strong vinegar like odor is noticeable immediately. how many acetic acid phases must be present in the bottle? explain.

The number of moles in 118.0g of calcium chloride

You should be worried about the safety of a healthcare product if you see which of the following claims made? a. FDA approved! b. Miracle cure! c. Scientifically tested! d. Effective in double-blind study!

Which branch of science provide the proof that earth is approximately 4.6 billion years old

What is the product if an atom of Po-209 undergoes alpha decay?

The first-order decomposition of n2o at 1000 k has a rate constant of 0.76 s-1. if the initial concentration of n2o is 10.9 m, what is the concentration of n2o after 9.6 s