The element mercury was first discovered on the Sun.

a. True

b. False

The half-life of a certain radioisotope is 8 days. How much (mass) of a 80 mg sample will remain after 24 days?

A weather balloon is inflated to a volume of 25.4 L at a pressure of 743 mmHg and a temperature of 25.8 ∘C. The balloon rises in the atmosphere to an altitude where the pressure is 400. mmHg and the temperature is - 13.0 ∘C.

Would an earthquake support the principle of uniformitarianism or the principle of catastrophism

30) When ionic bonds are formed, metallic atoms tend to A) lose electrons and become negative ions B) lose electrons and become positive ions C) gain electrons and become negative ions D) gain electrons and become positive ions

How much potassium chloride dissolved in 100 mL of water?

Donna is attempting to make an electromagnet to pick up old nails in and around her driveway. Which of these materials would be best to use for the core in order to make the strongest electromagnet to pick up the most nails?

The amount of silica in the magma and temperature are factors that determine the viscosity of magma.

Valeric acid, an organic acid, contains only C, H, and O. If 0.471 g of the acid burns completely in O2 it gives 1.01 g CO2 and 0.415 g H2O. Determine the empirical formula of the acid.

Ab2 has a molar solubility of 3.72*10-4 m. what is the value of the solubility product constant for ab2? express your answer numerically.

How much water must be added when 125 mL of a 2.00 M solution of HCl is diluted to a final concentration of 0.400M?