What are observations that indicate a chemical change has occurred?

A steel cylinder has a volume of 246 cm3 and a density of 7.93 g/cm3. What is its mass in kilograms?

Substances made of two or more elements which are not chemically bonded are known as

Which two polymers have the same linkages bonding the monomers together? A nylon and complex carbohydrate B nylon and protein C Terylene and complex carbohydrate D Terylene and protein

Which compound is classified as a hydrocarbon? A) butanal B) butyne C) 2-butanol D) 2-butanone

Elements have been discovered with up to how many energy levels

Which of the following is NOT true of nitrogen fixation? (A) it is a process that occurs exclusively in some species of prokaryotes (B) it sometimes occurs in bacteria that are mutualistic symbionts in plant roots (C) it is the metabolic process

What two pieces of information do u need to describe force

Why are the atomic masses for most elements not whole numbers?

An aqueous solution is 0.387 m in hcl. what is the molality of the solution if the density is 1.23 g/ml?

Carbon monoxide reacts with oxygen to form carbon dioxide. 2 CO (g) + O2 (g) → 2C02 (8) In a 1.00 L flask, 3.40 atm of CO reacts with 2.60 atm of O2. Assuming that the temperature remains constant, what is the final pressure in the flask? 4.30 atm 2.