if a penny is 1.15 mm thick how many pennies are needed to reach the ceiling in a room where the height is 2.30 m

A voltaic cell consists of a Zn/Zn2 + half-cell and a Ni/Ni2 + half-cell at 25? C. The initial concentrations of Ni2 + and Zn2 + are 1.70M and 0.130M, respectively. The volume of half-cells is the same.

1. A chemist prepares hydrogen fluoride by means of the following reaction: CaF2 + H2SO4 - > CaSO4 + 2HF The chemist uses 11 g of CaFz and an excess of H2SO4, and the reaction produces 2.2 g of HF. (a) Calculate the theoretical yield of HF.

If a block of wood floats in water, what does that mean about its density? Its density is greater than the density of water Its density is less than the density of water Its density is equal to the density of water Its density is not great enough to

1. Energy appears in two forms. What are they? A. Thermal and light B. Kinetic and electric C. Potential and kinetic D. Stored and active 2. Kinetic energy can be described as: A. Stored energy B. Energy in motion C. A chemical reaction D.

household baking soda has the chemical formula NaHCO3 what elements are in baking soda and how many atoms of each element are in one molecule?

What is the pH of a solution with [H+] = 7.0 x 10^-2?

A compound is a pure substance made of 2 or more types of elements that are chemically bonded True or false

In a chemical reaction, 300 grams of reactants are combined with 100 grams of reactant b. both a and b react to completion. how much will the product weigh

If log x = - 0.761. What does x equal

Can humans can live without using natural resources.