What demonstrates that this was a chemical change and not a physical change

The total energy of a system remains

Choose the best description for prokaryotic cell. A) has a nucleus; found in multicellular organisms B) has no nucleus; found in unicellular organisms C) has no nucleus; found in multicellular organisms D) has a nucleus;

Calculate the mass of 12.044*10^23atom of carbon

Which of the following chemical equations is NOT correctly balanced? N2 + H2 - - > 2 NH3 HCl + NaHCO3 - - > CO2 + H2O + NaCl C2H5OH + 3O2 - - > 2CO2 + 3H2O 4NH3 + 5O2 - - > 4NO + 6H2O

9. How many electrons are in the highest energy orbital of the element copper?

Which occurs when a warm fluid cools down? Energy is released to the environment. Energy is absorbed from the environment. The density of the fluid decreases. The mass of the fluid decreases.

If 3 g of element C combine with 8 g of element D to form compound CD, how many grams of D are needed to form compound CD2?

An easy way to assign the number of d-electrons (the “d count”) in a transition metal ion is to first look at the periodic table and take note of which group the element is in.

A basketball weigh more after it was inflated with air then when it was deflated how does this show that gas is matter

When was Magnesium discovered and how or who discovered it