Which of these is used to find the estimated age range of a fossil?

A.) Absolute dating

B.) Half-life

C.) Index fossils

D.) Radioactive dating

How many grams of sulfur dioxide are there in 12 liters of sulfur dioxide?

What are two major uses for non renewable resources? Select all that apply. A.) Electricity generation B.) Recycling C.) Growing food D.) Heating

What is the most prevalent species at pH = 10? A. At what pH do you have ~99% B. If you have access to both 10 M KOH and 10 M HCl, how much of which would you add to change 1 L of a 100 mM solution of the buffer described by this equilibrium from 3

Classify blood as a mixture or a pure substance. if blood is a mixture, classify it as either heterogeneous or homogeneous. if blood is a pure substance, identify it as either an element or a compound.

For the reaction: 6 Li (s) + N2 (g) → 2 Li3N (s) Determine: a) the mass of N2 needed to react with 0.536 moles of Li. b) the number of moles of Li required to make 46.4 g of Li3N. c) the mass in grams of Li3N produced from 3.65 g Li.

Hydrogen peroxide decomposes to water and oxygen at constant pressure by the following reaction: 2H2O2 (l) → 2H2O (l) + O2 (g) ΔH = - 196 kJ Calculate the value of q (kJ) in this exothermic reaction when 3.

What is the concentration of hydronium in each of the following cases: [OH-] = 10-12 M? [OH-] = 10-2 M?

Which statement best explains why elements are matter? An element is a physical substance that has mass and takes up space. Elements are pure substances that cannot be divided chemically. Each element is a pure substance composed of one type of atom.

Which of the following best describes what causes the phases of the moon? The alignment of the sun, Earth, and moon The speed of the moon around the Earth The speed of the Earth around the sun The alignment of the planets

At which temperature would atoms of a He (g) sample have the greatest average kinetic energy? (1) 25°C (3) 273 K (2) 37°C (4) 298 K