All of the following are signs of chemical change except

fizzing

sound production

melting

heat production

Suggest one reason why it is difficult to dispose of the waste rock

Use the periodic table to determine which of the following could be an isotope of bromine (Br). Check all that apply. - Z = 79, A = 196 Z = 35, A = 79 A = 79, N = 44 Z = 44, N=44 NDN DONE

Charcoal (burned wood) that was used to make prehistoric drawings on cave walls in france was scraped off and analyzed. the results were 8 mg-carbon-14 (parent isotope) and 56 mg hitrogen (daughter isotope). the half-life of carbon-14 is 5,730 years.

How much is 6.10^23 in grams?

You find small pieces of ice instead of ice cubes in the freezer. State how this is possible.

Which state of the West produces the widest varieties of fruits, vegetables, and nuts? A) California B) Colorado C) Wyoming D) Alaska

A chemical engineer for a fertilizer company is determining the most efficient way to produce ammonia. the engineer carries out the haber reaction under four different conditions.

What type of Bond exist in a molecule of hydrogen Iodide

Which common material is an example of a polyamide?

A particular brand of gasoline has a density of 0.737 g/mL at 25 ∘ C. How many grams of this gasoline would fill a 12.8 gal tank (1US gal=3.78L) ?