Compare and contrast substances and mixtures with two examples

A fire turns dead trees/decaying trees into ash which nutrients return to the soil.

Approximately how many elements are there that combine chemically in a great number of ways to produce compounds? A. 25 B. 50 C. 75 D. 100

What is the net ionic equation of the reaction of mgso4 with ba (no3) 2? express you answer as a chemical equation including phases. view available hint (s) ?

Which atom's ionization energy is greater than that of phosphorus (P) ?

How many moles of potassium chloride, kcl, are needed to make 100.0 ml of a 2.0 m kcl solution?

Of the following reactions, which one produces oxygen gas? Fermentation Anaerobic respiration Aerobic respiration Photosynthesis

Describe the electrodes in this iron-copper galvanic cell.

What happens to wood when it burns?

El cuerpo humano tiene unos 6 billones de células (6,0x1012) y la población de la Tierra es de unos 8 000 millones de personas. Con estos datos aproximados, calcula las moles de células humanas que hay en la Tierra.

True or false: an apple looks red because it absorbs red light?