Which isotope is used to date ancient artifacts such as fossils?

carbon-12

carbon-14

uranium-238

oxygen-16

Some ionic compounds do not dissolve in water because ... a) the ionic bonds are too strong to be broken by the attraction of the water molecules b) they float on the surface c) water is a covalent compound so it cant dissolve ionic compouds d)

How many moles of solute are dissolved in 6.5 L of a solution that has a molarity of 4.8 M? 31 moles 1.4 moles 0.74 moles

What is the name of alcohol that would produce 3-pentanone

The decay of a radioactive isotope follows first-order kinetics. Iodine-131, used to treat cancer of the thyroid gland, has a half-life of days.

Oxidation reactions occur when a substance is combined with? fuel oxygen water fire

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

In the reaction, HCl + H2O produces H3O + Cl, what is the conjugate acid