Is it physical change or chemical change when you smooth a wood chair with sandpaper?

When copper reacts with silver nitrate according to the equation, the number of grams of copper required to produce 432 grams of silver is - ?

Eukaryote:mitosis:: prokaryote: a. binary fission b. budding c. both binary fission and budding d. none of the above

Given 1.00 gram of (NH4) 2 CO3, how many grams of this sample would be due to hydrogen?

Elements in group 2 are all called alkaline earth metals. What is most similar about the alkaline earth metals?

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

In which atmosphere layer does 80% of the gas in the atmosphere reside

When oxygen (O) reacts with iron (Fe), it produces rust (Fe2O3). In a closed system, how much oxygen must react with 120 grams of iron to produce 580 grams of rust?

How many molecules of CaCL2 are equivalent to 75.9g CaCl2

What is represented in an electron dot diagram

In a first order reaction, what fraction of the reactant will remain after 4 half-lives?