The mass of the rock is 1220 kg. It had 400 J of potential energy as it sits on the hill. Calculate the height

Which of the following elements makes up the tissues and organs of animals? A. Carbon B. Hydrogen C. Nitrogen D. Oxygen

Formic acid (HCO2H) has a dissociation constant of 1.8 _ 104 M. The acid dissociates 1:1. What is the [H+] if 0.1 mole of formic acid is dissolved in 1.0 liter of water? Use a scientific calculator. 0.9 _ 10^-3 M 4.2 _ 10^-3 M 7.

What is the mass number of an ion with 105 electrons, 157 neutrons, and a 1 charge?

The particles that are found in the mucleus of an atom are 1. neutrons 2. electrons only 3. protons and neutrons 4. protons and electrons

What is the density of iron?

If A is slowly added to a solution containing 0.0500 M of B and 0.0500 M of C, which solid will precipitate first? The solubility product constant for A2B3 is 2.30*10-8. The solubility product constant for AC4 is 4.10*10-8.

Research three different types of fire extinguisher and explain how these can be used to put out different fires, you must relate this to the fire triangle and the section that is removed

If a mineral has a daughter to parent ration of 3:1 (three daughter atoms for every one parent atom), how many half-lives have passed since the mineral formed?

What is true of the enthalpy value of an intermediate reaction? A. It always has a negative enthalpy value B. It is multiplied by 2 if the intermediate reaction is multiplied by 2 C. It is the same as the total enthalpy of reaction D.

Calculate the percent composition of the compound that forms when 222.6 g N combines completely with 77.4 g 0. calculate to the nearest tenth of a percent.