Which types of changes observe the law of conservation of mass?

a. only changes of state

b. only physical changes

c. only chemical changes

d. all of the above

Which of the following statements is TRUE? A. A strong acid has a strong conjugate base. B. A strong acid is composed of a proton and an anion that have a very strong attraction for one another. C.

In what type of solids are the particles not arranged in a regular pattern

How many valence electrons does a neutral atom of aluminum have?

What does oil have to do with fat

Binary compounds of alkali metals and hydrogen react with water to produce H2 (g). The H2 from the reaction of a sample of NaH with an excess of water fills a volume of 0.500 L above the water.

What would make the risk of these cancers even worse for someone who drinks alcohol?

For what reasons would modern scientists accept dalton's atomic theory but not the idea of an atom proposed by the greek philosophers?

Which physical method can be used for obtaining a sample of salt from a small beaker of salt water? boiling freezing chromatography sorting

Science is a unique field of thought because it relies on to describe the world. •Observations and experim •Teachers and students •Books and writings •Scientists and statements

Hemoglobin, a protein in red blood cells, carries o2 from the lungs to the body's cells. iron (as ferrous ion, fe2+) makes up 0.33 mass % of hemoglobin. if the molar mass of hemoglobin is 6.8 Ã 104 g/mol, how many fe2 + ions are in one molecule?