Does a physical change ever alter the appearance of a substance

How many atoms of phosphorus are in 3.80 mol of copper (II) phosphate?

In which equation does the term "heat" represent heat of fusion? (1) NaCl (s) + heat - - >NaCl (l) (2) NaOH (aq) + HCl (aq) - - >NaCl (aq) + H2O (l) + heat (3) H2O (l) + heat - - > H2O (g) (4) H2O (l) + HCl (g) - - >H3O + (aq) + Cl - (aq) + heat

What is the definition of summer and winter?

A chemical change always involves a change to the - - - of matter

What is a promblem based on charles' law?

Nitrous oxide (n2o), or laughing gas, is commonly used as an anesthetic in dentistry and surgery. how many moles are present in 8.4 liters of nitrous oxide at stp?

How can an atom be electrically neutral when it contains particles that are charged?

Is boiling water considered physical or chemical bond

Which of the following is the correct scientific notation for 0.000451 g? 4.5 x 10-3 4.5 x 10-5 4.51 x 10-4 45.1 x 10-4

A phase change from a solid to a gas is called what