Is aluminum foil an element, compound or mixture

How can I make new substances?

Saltpeter is a compound made of potassium (k), nitrogen (n), and oxygen (o). Every 100.00 g of saltpeter contains 38.67 g potassium and 13.86 g nitrogen. What is the mass of oxygen contained in 334.0 mg of saltpeter

Which of the following statements demonstrates that the ocean is connected to all of Earth's water reservoirs through the processes of evaporation and precipitation? A.) A water molecule is consumed by a person or animal and released as perspiration.

What is the total mass of Kr-42 remaining in a 20-mg sample after 48.8 hours? (1) 2.5 mg (2) 5.0 mg (3) 10 mg 4) 20 mg

Repeating tests usually leads to

If a microgram is one millionth of a gram (0.000 00 1 g), how many micrograms are there in one gram?

A solution is prepared at that is initially in chloroacetic acid, a weak acid with, and in potassium chloroacetate. Calculate the pH of the solution. Round your answer to decimal places.

What type of reaction is most likely to occur when barium reacts with fluorine? combustion synthesis decomposition single replacement?

Which air pollutant contributes to asthma? Emissions Particulate matter Contaminated groundwater Carbon monoxide

Carbon has an atomic number of 6. How many electrons are in a carbon atom's second energy level?