What is always true of a combustion reaction?

carbon dioxide will be produced

the reaction absorbs energy

oxygen gas must be one of the reactants

one reactant must contain carbon

Which of the following can you use to justify the statement that the iron found in a sample of iron oxide is an element and not a compound? A. The mass of the iron oxide is greater than the mass of the iron alone. B.

How are chromosomes, genes, and DNA are connected?

Write a fully balanced symbol equation for the reaction of hydrochloric acid with magnesium carbonate.

Which of the ailments listed had a frequency of three?

What stressors will affect the value for Keq according to Le Chatelier's principle?

Which of the following statements about chemical formulas is FALSE? A) The subscripts represent the relative number each type of atom in the compound. B) The subscripts represent the relative mass of each type of atom in the compound.

The lowest possible concentration of free hydrogen ions is represented by a ph value of

Diseases that are inherited are caused by

Why do many metal ions produce acidic solutions when dissolved in water?

Which property of potential energy distinguishes it from kinetic energy? a. mass b. position c. force d. work and power