How many elements occur naturally on earth?

Which of the following are part of the hydrologic cycle? A. Dissipation B. Evaporation C. Fusion D. Precipitation E. Condensation

Which characteristic of a substance is considered a chemical property

Predict how the addition of a catalyst would affect the rate of the reaction below, and explain your prediction. h2 (g) + i2 (g) 2hi

What is the word equation for sulfuric acid and copper oxide.

When compounds form, which of the following statements is true about the elements that form them? A. their properties do not change. B. their properties are an average of all elements in the compound. C. their properties change completely. D.

Which of the following is diamagnetic? A) Sn B) Pb 2+ C) I D) N E) All are paramagnetic

Based on your observations in the lab, what do you think happens to the majority of water (not, ice) at the poles? at the equator?

How do organisms interact with each other and how can one organism be dependent upon other species

Check Sodium inside a star is most likely formed by which process? fission fusion <<--? alpha emission Beta emission

Which of these is the main goal of any titration? to observe the effect of indicators on acids to observe the effect of indicators on bases --> (((to determine the concentration of one of the reactants))) <--- to determine the effects of a base on