Which statement describes evidence of chemical reaction

A 5.10 g sample of iron is heated from 36.0 to 75.0 C. The amount of energy required is 89.5 J. The specific capacity of this sample of iron is ... A.) 17800 J/g C B.) 0.900 J/g C C.) 11.7 J/g C D.) 0.450 J/g C E.) 2.22 J/g C

In what form does all radiant energy travel through space?

Calculate the percent activity of the radioactive isotope iodine-131 remaining after 3 half-lives.

Express the product of 5.4 mm and 6.02 mm using the correct number of significant digits. a. 32 mm^2 b. 33 mm^2 c. 32.5 mm^2 d. 32.51 mm^2

How many grams of solute are contained in 356 g of a 12.5% (w/w) solution?

A canister of acetylene has a volume of 42 L. The temperature of the acetylene is 305 K and the pressure is 780 torr. Determine the amount of gas in the canister

In terms of the scientific method, the purpose of an experiment is: form a hypothesis test a hypothesis form a conclusion develop data

Which layer of the earth can only be studied by indirect means

Is Euglena heterotroph or autotroph

What is the mass of 5000. atoms of silicon