Percent copper in brass lab

Consider the exothermic reaction 4nh3 (g) + 5o2 (g) →4no (g) + 6h2o (g) calculate the standard heat of reaction, or δh∘rxn, for this reaction using the given data.

The atoms of gold would be the same as the atoms of iron and have the same properties. True or false?

In 1897 the Swedish explorer Andree tried to reach the North Pole in a balloon. The balloon was filled with hydrogen gas. The hydrogen gas was prepared from iron splints and diluted sulfuric acid. The reaction is given below.

If you have 222 g of radioisotope with a half-life of 5 days, how much isotope would remain after 15 days? b. what percentage of a radioactive isotope would remain after four half-lives?

A 0.210 mL sample of very-low-density lipoprotein (VLDL) has a mass of 206 mg. What is the density of the VLDL?

1. Calculate the end velocity of a rocket that traveled 16km in 2 seconds. distance time 2. Calculate the rockets acceleration m with a start velocity of 0m/s and the end velocity from #1 for 10 seconds.

How are linear and nonlinear graphs alike

Uranium nuclei split during nuclear fission true or false

Calculate the mass of 2.25*10^22tungsten atoms.

Which weathering process involves physical forces but not chemical reactions or dissolving of minerals