Matter that is always made up of the same combination of atoms is defined as a (n)

a 0.5674 g piece of copper is added to 10.00 ml; of 16 M HNO3, producing 0.8024 g of copper (ii) nitrate. What is the precent yield of the reaction?

1. Is mass conserved when 50 g of sugar undergoes a physical change? Use complete sentences to support your answer by explaining how this can be demonstrated. 2. During an investigation a scientist burned 48 g of magnesium strip.

In the chemical reaction: 2 h 2 (g) o2 (g) → 2 h2o (g), with 8 grams of h 2 (2 grams/mole) and 16 grams of o2 (32 grams/mole) and the reaction goes to completion, what is the excess reactant and how much of that would remain

Determine the mass of gold that can be extracted if 20.8 g sodium cyanide is used.

Helium has two naturally occurring isotopes, helium-3 and helium-4. the atomic mass of helium is 4.003 amu. which isotope is more abundant in nature? explain your answer.

Where are most of the young, massive stars in the Milky Way?

A chemistry teacher needs to determine what quantity of sodium hydroxide to order

Never trust Wikipedia .

Which is the molar mass of BF3?

Mg3 (Si2O5) 2 (OH) 2 There are. 0893 moles of magnesium how many moles of silicon are there in the sample?