Which is a sign of chemical change?

A. chocolate syrup dissolve in milk

B. folding paper changes the size

C. toast smells different than bread

What are plates underneath continents called?

We know from the relative amounts of 16O and 18O that global temperatures and global climate have changed over time.

Why there is not reaction in nac2h3o2 (aq) + pb (no3) 2 (aq) →?

Find change H for the reaction as it occurred in the calorimeter.

Which statement concerning the reversible reaction 2 NO2 (g) - N204 (9) is true? NO2 is the product of the forward reaction. OA The reverse reaction produces N204. At the start of the reaction, the forward and reverse reaction rates are equal.

Acids A) are generally proton donors B) produce H + ions in solution C) are electron pair acceptors D) may include all of these characteristics

3.011 x 10^23 atoms F in grams

What would you use if you needed to determine the density of an object? balance and graduated cylinder balance and scale scale and spectroscope

What are two forms of friction that oppose the motion of a moving car

How are models related to theories and hypotheses