Most of the time, combustion reactions occur when hydrocarbons react with what element? A. sulfur B. oxygen C. chlorine D. nitrogen

piece of copper iron silver and gold are dropped into a solution of iron sulphate the piece that will get a coating of a copper is known as

A food chain is a. All the biotic interactions b. All the feeding relationships in the ecosystem c. The link between abiotic and biotic factors D. The single sequence of organisms feeding TWO examples of abiotic factors needed in an ecosystem are a.

if the volume of a gas at 200.0 kPa is 25.5 L. what is the new volume of the gas at 11.2 atm of pressure?

A sample of helium gas is at 122 kPa and 22°C. Assuming constant volume, what will the temperature be when the pressure is 203 kPa?

The substances in a chemical reaction that are combined or separated to form new substances are the

Convert the pressure 0.840 atm to mm Hg

What is the temperature in Celsius of 308 K?

Why does metal need to be extracted from an ore before it can be used?

If heat is released, how does the solution feel?

What is the mass number of an ion with 107 electrons, 157 neutrons, and a 1 charge?