Pure substance made up of one type of atom?

Which statement describes chemical reactions that take place at different rates? A. One reaction produces more products than the other. B. One reaction begins with more reactants than the other. C.

The direction towards the headwaters of a stream is called? A. tributary B. headwater C. downstream D. upstream

The factor 0.01 corresponds to which prefix? A) milli B) deci C) deka D) centi

Why are environmental factors important to consider when assessing an individual's health? a. Environmental factors are the sole cause of health related issues. b.

Which answer choice correctly describe a trend of valence electrons in the periodic table? Select all that apply. Elements in the same group have the same number of valence electrons.

A) the ka for acetic acid (h3cco2h) is 1.737 * 10-5. what is the pka for this acid? b. use the pka calculated above to determine the ph at which [h3cco2h]=[h3cco2-].

Suppose you take a piece of hard wax from an unlit candle. After you roll the wax between your fingers for a while, it becomes soft. What State of matter is the softer wax? Is it possible for wax to change without changing state

Prevailing winds peru

Foods labeled "fat free" can actually contain less than 0.5 grams of fat.

Plants make their own food. The chemical reaction for this process is shown in the equation below. CO2 + H2O + energy → C6H1206 + O2 What are the products in this chemical reaction? O A. C6H1206 + energy O B. H20 + energy O C. CoH1206+02 O D.